JP2021106302A - Communication device - Google Patents

Abstract

To enable more flexible resource allocation in device-to-device communication such as V2X communication.SOLUTION: A communication device includes a communication unit that performs wireless communication, a notification unit that notifies a base station of first information regarding a condition for periodically transmitting a packet to another terminal device by inter-device communication, an acquisition unit that acquires second information regarding a transmission resource available for transmission of the periodic packet from the base station after the notification of the first information, and a control unit that selects a resource to be used for transmitting the periodic packet on the basis of the second information.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to communication devices.

In recent years, expectations for in-vehicle communication (V2X communication) have been increasing for the realization of autonomous driving in the future. V2X communication is an abbreviation for Vehicle to X communication, and is a system in which "something" communicates with a car. Examples of "something" here include vehicles, infrastructure, networks, pedestrians, etc. (V2V, V2I, V2N, and V2P). For example, Patent Document 1 discloses an example of a technique related to V2X communication.

In addition, as wireless communication for automobiles, the development of DSRC (Dedicated Short Range Communication) based on 802.11p has been mainly promoted, but in recent years, LTE-based in-vehicle communication "LTE-" has been promoted. The standardization of "based V2X" has been carried out. In LTE-based V2X communication, the exchange of basic safety messages and the like is supported.

Japanese Unexamined Patent Publication No. 2017-2087996

Further, with the aim of further improving V2X communication, NR V2X communication using 5G technology (NR: New Radio) has been studied in recent years. NR V2X communication supports new use cases that require high reliability, low latency, high-speed communication, and high capacity, which could not be supported by LTE-based V2X so far.

On the other hand, as the required specifications are diversified according to the use case, the transmission timing of the packet may vary depending on the jitter component contained in the traffic, and the size of the transmitted packet may vary. The situation can be assumed.

Therefore, the present disclosure proposes a technique that enables more flexible resource allocation in inter-device communication such as V2X communication.

According to the present disclosure, a communication unit that performs wireless communication, a notification unit that notifies a base station of first information regarding conditions for periodically transmitting a packet to another terminal device by inter-device communication, and the above-mentioned first. After the notification of the information of 1, the acquisition unit that acquires the second information about the transmission resource available for transmission of the periodic packet from the base station, and the periodic based on the second information. A communication device is provided that includes a control unit that selects resources to be used for transmitting various packets.

Further, according to the present disclosure, information on a communication unit that performs wireless communication and a first resource allocated to be used for transmitting a periodic packet to another terminal device by inter-device communication, and a transmission schedule. A communication device is provided that includes information about the packet, and a control unit that acquires a second resource different from the first resource according to the information.

As described above, according to the present disclosure, there is provided a technique that enables more flexible resource allocation in inter-device communication such as V2X communication.

It should be noted that the above effects are not necessarily limited, and either in combination with or in place of the above effects, any of the effects shown herein, or any other effect that can be grasped from this specification. May be played.

It is explanatory drawing for demonstrating an example of the schematic structure of the system which concerns on one Embodiment of this disclosure. It is a block diagram which shows an example of the structure of the base station which concerns on this embodiment. It is a block diagram which shows an example of the structure of the terminal apparatus which concerns on this embodiment. It is a figure which showed the outline of V2X communication. It is explanatory drawing for demonstrating an example of the whole image of V2X communication. It is a figure which showed an example of the use case of V2X communication. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating an example of a V2X operation scenario. It is explanatory drawing for demonstrating the outline about the feature of the packet assumed in NR V2X communication. It is a figure which showed an example of the configuration of the resource allocated to the side link communication. It is a sequence diagram which showed an example of the process flow of Mode3 resource allocation. It is a sequence diagram which showed another example of the process flow of Mode3 resource allocation. It is explanatory drawing for demonstrating the outline of SPS assistance information. It is a timing chart which showed an example of the processing flow when Semi-persistent scheduling is carried out. It is explanatory drawing for demonstrating an example of the operation timeline when a terminal apparatus transmits a packet based on Mode4 resource allocation. It is explanatory drawing for demonstrating an example of the sensing operation for selecting a resource from a resource pool. It is explanatory drawing for demonstrating an example of the case where the same resource allocation method as the conventional side link communication is applied to NR V2X communication. It is explanatory drawing for demonstrating the outline of the resource allocation of a Proactive type. It is a sequence diagram which showed an example of the flow of a series of processing of the system which concerns on one Embodiment of this disclosure. It is explanatory drawing for demonstrating an example of the level setting method for the resource block divided from SPS resource. It is explanatory drawing for demonstrating an example of the level setting method for the resource block divided from SPS resource. It is explanatory drawing for demonstrating an example of the level setting method for the resource block divided from SPS resource. It is explanatory drawing for demonstrating the outline of the resource allocation of a Reactive type. It is a flowchart which showed an example of the flow of a series of processing of a terminal device at the time of resource allocation of a Reactive type. It is a flowchart which showed another example of the flow of a series of processing of a terminal device at the time of resource allocation of a Reactive type. It is a flowchart which showed another example of the flow of a series of processing of a terminal device at the time of resource allocation of a Reactive type. It is a sequence diagram which showed an example of the processing flow which concerns on the setting of the back-up resource pool (BRP). It is a flowchart which showed another example of the flow of a series of processing of a terminal device at the time of resource allocation of a Reactive type. It is a flowchart which showed an example of the flow of a series of processing of a terminal apparatus in the system which concerns on a modification. It is a flowchart which showed another example of the flow of a series of processing of a terminal apparatus in the system which concerns on a modification. It is a flowchart which showed an example of the flow of a series of processing of a base station in the system which concerns on a modification. It is a block diagram which shows 1st example of the schematic structure of eNB. It is a block diagram which shows the 2nd example of the schematic structure of eNB. It is a block diagram which shows an example of the schematic structure of a smartphone. It is a block diagram which shows an example of the schematic structure of a car navigation device.

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

The explanations will be given in the following order.
1. 1. Configuration example 1.1. An example of system configuration 1.2. Base station configuration example 1.3. Configuration example of terminal device 2. V2X communication 3. Examination of resource allocation in V2X communication 4. Technical features 4.1. Proactive type resource allocation 4.2. Reactive type resource allocation 4.3. Modification example 5. Application example 5.1. Application examples related to base stations 5.2. Application examples related to terminal devices 6. Conclusion

<< 1. Configuration example >>
<1.1. Example of system configuration>
First, with reference to FIG. 1, an example of a schematic configuration of the system 1 according to the embodiment of the present disclosure will be described. FIG. 1 is an explanatory diagram for explaining an example of a schematic configuration of the system 1 according to the embodiment of the present disclosure. As shown in FIG. 1, the system 1 includes a wireless communication device 100 and a terminal device 200. Here, the terminal device 200 is also referred to as a user. The user may also be referred to as a UE. The wireless communication device 100C is also called a UE-Relay. The UE here may be the UE defined in LTE or LTE-A, and the UE-Relay may be the Prose UE to Network Relay discussed in 3GPP, and more generally communicate. It may mean a device.

(1) Wireless communication device 100
The wireless communication device 100 is a device that provides a wireless communication service to a subordinate device. For example, the wireless communication device 100A is a base station of a cellular system (or mobile communication system). The base station 100A performs wireless communication with a device (for example, a terminal device 200A) located inside the cell 10A of the base station 100A. For example, the base station 100A transmits a downlink signal to the terminal device 200A and receives an uplink signal from the terminal device 200A.

The base station 100A is logically connected to another base station by, for example, an X2 interface, and can transmit and receive control information and the like. Further, the base station 100A is logically connected to a so-called core network (not shown) by, for example, an S1 interface, and can transmit and receive control information and the like. Communication between these devices can be physically relayed by various devices.

Here, the wireless communication device 100A shown in FIG. 1 is a macro cell base station, and cell 10A is a macro cell. On the other hand, the wireless communication devices 100B and 100C are master devices that operate the small cells 10B and 10C, respectively. As an example, the master device 100B is a small cell base station that is fixedly installed. The small cell base station 100B establishes a wireless backhaul link with the macro cell base station 100A and an access link with one or more terminal devices (for example, the terminal device 200B) in the small cell 10B. The wireless communication device 100B may be a relay node defined by 3GPP. The master device 100C is a dynamic AP (access point). The dynamic AP100C is a mobile device that dynamically operates the small cell 10C. The dynamic AP100C establishes a wireless backhaul link with the macrocell base station 100A and an access link with one or more terminal devices (eg, terminal device 200C) in the small cell 10C. The dynamic AP100C may be, for example, a terminal device equipped with hardware or software capable of operating as a base station or a wireless access point. The small cell 10C in this case is a dynamically formed localized network (Localized Network / Virtual Cell).

Cell 10A is an arbitrary wireless communication system such as LTE, LTE-A (LTE-Advanced), LTE-ADVANCED PRO, GSM®, UMTS, W-CDMA, CDMA2000, WiMAX, WiMAX2 or 802.16. It may be operated according to.

The small cell is a concept that can include various types of cells smaller than the macro cell (for example, femtocell, nanocell, picocell, microcell, etc.) that are arranged so as to overlap or do not overlap with the macrocell. In one example, the small cell is operated by a dedicated base station. In another example, the small cell is operated by the terminal serving as a master device temporarily operating as a small cell base station. So-called relay nodes can also be considered as a form of small cell base station. A wireless communication device that functions as a master station of a relay node is also called a donor base station. The donor base station may mean DeNB in LTE, or more generally the master station of the relay node.

(2) Terminal device 200
The terminal device 200 can communicate in a cellular system (or mobile communication system). The terminal device 200 performs wireless communication with a wireless communication device of the cellular system (for example, base station 100A, master device 100B or 100C). For example, the terminal device 200A receives the downlink signal from the base station 100A and transmits the uplink signal to the base station 100A.

Further, the terminal device 200 is not limited to the so-called UE, and for example, a so-called low cost terminal (Low cost UE) such as an MTC terminal, an eMTC (Enhanced MTC) terminal, and an NB-IoT terminal may be applied. .. Further, an infrastructure terminal such as an RSU (Road Side Unit) or a terminal such as a CPE (Customer Premises Equipment) may be applied.

(3) Supplement Although the schematic configuration of the system 1 has been shown above, the present technology is not limited to the example shown in FIG. For example, as the configuration of the system 1, a configuration that does not include a master device, SCE (Small Cell Enhancement), HetNet (Heterogeneous Network), an MTC network, or the like can be adopted. Further, as another example of the configuration of the system 1, the master device may be connected to the small cell and the cell may be constructed under the small cell.

<1.2. Base station configuration example>
Next, the configuration of the base station 100 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 2 is a block diagram showing an example of the configuration of the base station 100 according to the embodiment of the present disclosure. Referring to FIG. 2, the base station 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140, and a control unit 150.

(1) Antenna unit 110
The antenna unit 110 radiates the signal output by the wireless communication unit 120 into space as a radio wave. Further, the antenna unit 110 converts a radio wave in space into a signal and outputs the signal to the wireless communication unit 120.

(2) Wireless communication unit 120
The wireless communication unit 120 transmits and receives signals. For example, the wireless communication unit 120 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.

(3) Network communication unit 130
The network communication unit 130 transmits / receives information. For example, the network communication unit 130 transmits information to another node and receives information from the other node. For example, the other nodes include other base stations and core network nodes.

As described above, in the system 1 according to the present embodiment, the terminal device may operate as a relay terminal and relay the communication between the remote terminal and the base station. In such a case, for example, the wireless communication device 100C corresponding to the relay terminal may not include the network communication unit 130.

(4) Storage unit 140
The storage unit 140 temporarily or permanently stores the program and various data for the operation of the base station 100.

(5) Control unit 150
The control unit 150 provides various functions of the base station 100. The control unit 150 includes a communication control unit 151, an information acquisition unit 153, and a notification unit 155. The control unit 150 may further include other components other than these components. That is, the control unit 150 can perform operations other than the operations of these components.

The communication control unit 151 executes various processes related to the control of wireless communication with the terminal device 200 via the wireless communication unit 120. For example, the communication control unit 151 may allocate resources used by the terminal device 200 to transmit packets. Further, at this time, the communication control unit 151 may reserve resources available for the periodic packet transmission in anticipation of the periodic packet transmission by the terminal device 200. Specifically, the communication control unit 151 may allocate in advance resources that can be used for packet transmission at other transmission timings after the transmission, in addition to the resources that the terminal device 200 most recently uses for packet transmission. good. At this time, the communication control unit 151 may control the range in which the resource is reserved based on a predetermined condition.

In addition, the communication control unit 151 executes various processes related to the control of communication with other nodes (for example, other base stations, core network nodes, etc.) via the network communication unit 130.

The information acquisition unit 153 acquires various information from the terminal device 200 and other nodes. As a specific example, the communication control unit 151 may perform information regarding periodic packet transmission from the terminal device 200 to another terminal device 200 by the terminal device 200 (for example, information regarding periodic packet transmission conditions). May be obtained. The acquired information may be used, for example, for controlling wireless communication with the terminal device 200, controlling for cooperation with other nodes, and the like.

The notification unit 155 notifies the terminal device 200 and other nodes of various information. As a specific example, the notification unit 155 may notify the terminal device of various information for the terminal device in the cell to perform wireless communication with the base station. Further, as another example, the notification unit 155 may notify another node (for example, another base station) of the information acquired from the terminal device in the cell.

<1.3. Terminal device configuration example>
Next, an example of the configuration of the terminal device 200 according to the embodiment of the present disclosure will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the configuration of the terminal device 200 according to the embodiment of the present disclosure. As shown in FIG. 3, the terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230, and a control unit 240.

(1) Antenna unit 210
The antenna unit 210 radiates the signal output by the wireless communication unit 220 into space as a radio wave. Further, the antenna unit 210 converts a radio wave in space into a signal and outputs the signal to the wireless communication unit 220.

(2) Wireless communication unit 220
The wireless communication unit 220 transmits and receives signals. For example, the wireless communication unit 220 receives the downlink signal from the base station and transmits the uplink signal to the base station.

Further, in the system 1 according to the present embodiment, the terminal device 200 may directly communicate with another terminal device 200 without going through the base station 100. In this case, the wireless communication unit 220 may transmit and receive a side link signal to and from another terminal device 200.

(3) Storage unit 230
The storage unit 230 temporarily or permanently stores the program and various data for the operation of the terminal device 200.

(4) Control unit 240
The control unit 240 provides various functions of the terminal device 200. For example, the control unit 240 includes a communication control unit 241, an information acquisition unit 243, a determination unit 245, and a notification unit 247. The control unit 240 may further include other components other than these components. That is, the control unit 240 may perform operations other than the operations of these components.

The communication control unit 241 executes various processes related to the control of wireless communication with the base station 100 and other terminal devices 200 via the wireless communication unit 220. For example, the communication control unit 241 may select a part of the resources reserved by the base station 100 and control the packet to be transmitted using the selected resource.

The information acquisition unit 243 acquires various information from the base station 100 and other terminal devices 200. As a specific example, the information acquisition unit 243 may acquire various information for selecting resources to be used for communication with the other terminal device 200 from the base station 100 or the other terminal device 200. As a more specific example, the information acquisition unit 243 may acquire information about a resource reserved by the base station 100 from the base station 100.

The determination unit 245 executes processing related to various determinations. For example, the determination unit 245 may make a predetermined determination based on the information acquired from the base station 100 or another terminal device 200. As a more specific example, the determination unit 245 may determine whether or not the packet to be transmitted can be transmitted by using the resource reserved by the base station 100. Further, when it is difficult to use the resource reserved by the base station 100 for the transmission of the packet, the determination unit 245 may make a determination regarding the selection of the resource to be used for the transmission of the packet.

The notification unit 247 notifies the base station 100 and other terminal devices 200 of various information. As a specific example, other terminal devices 200 may be notified of information about resources reserved for use in transmitting packets.

<< 2. V2X communication >>
Subsequently, the outline of V2X communication will be described. V2X communication is an abbreviation for Vehicle to X communication, and is a system in which "something" communicates with a car. For example, FIG. 4 is a diagram showing an outline of V2X communication. Examples of "something" here include vehicles (Vehicle), equipment (Infrastructure), networks (Network), pedestrians (Pedestrian), and the like (V2V, V2I), as shown in FIG. , V2N, and V2P).

(Overview of V2X communication)
Further, FIG. 5 is an explanatory diagram for explaining an example of the overall image of V2X communication. In the example shown in FIG. 5, a V2X application server (APP server) is held as a cloud server, and the application server controls V2X communication on the core network side. The base station performs Uu-link communication with the terminal device, while performing communication control of direct communication such as V2V communication and V2P communication. In addition to the base station, an RSU (Road Side Unit) is arranged as a roadside infrastructure. There are two possible RSUs, a base station type RSU and a UE type RSU. In RSU, V2X application (V2X APP) is provided and support such as data relay is provided.

(V2X communication use case)
As wireless communication for automobiles, the development of DSRC (Dedicated Short Range Communication) based on 802.11p has been mainly promoted, but in recent years, LTE-based in-vehicle communication "LTE-based V2X" has been promoted. (LTE-based V2X communication) ”has been standardized. In LTE-based V2X communication, the exchange of basic safety messages and the like is supported. On the other hand, with the aim of further improving V2X communication, NR V2X communication using 5G technology (NR: New Radio) has been studied in recent years. For example, FIG. 6 is a diagram showing an example of a use case of V2X communication.

NR V2X communication supports new use cases that require high reliability, low latency, high speed communication, and high capacity, which were previously difficult to support with LTE-based V2X. As a specific example, among the examples shown in FIG. 6, for example, provision of a dynamic map, remote driving, and the like can be mentioned. In addition to this, there are sensor data sharing in which sensor data is exchanged between vehicles and road vehicles, and plateoning use cases for platooning. Use cases and requirements for such NR V2X communication are specified in 3GPP TR22.886. For reference, an outline of an example of a use case will be described below.

(1) Vehicles Platoonning
This is a use case of platooning in which a plurality of vehicles form a platoon and travel in the same direction, and information is exchanged between the vehicle leading the platooning and another vehicle to control the platooning. By exchanging such information, for example, it becomes possible to further reduce the inter-vehicle distance of platooning.

(2) Extended Sensors
This is a use case in which sensor-related information (raw data before data processing and data after processing) can be exchanged between vehicles. Sensor information is collected through local sensors, live video images (eg, live video images between surrounding vehicles, RSUs, and pedestrians), V2X application servers, and the like. By exchanging these information, the vehicle can obtain information that cannot be obtained by its own sensor information, and can recognize / recognize a wider range of environments. In this use case, since it is necessary to exchange a lot of information, a high data rate is required for communication.

(3) Advanced Driving
This is a use case that enables semi-automatic driving and fully automatic driving. In this use case, the RSU shares the cognitive / recognition information obtained from its own sensors, etc. with the surrounding vehicles, so that each vehicle adjusts the track and operation in synchronization with and cooperates with other vehicles. Can be done. In addition, each vehicle can share the intention and intention of driving with neighboring vehicles.

(4) Remote Driving
This is a use case for remote control and V2X applications. Remote control is used when another person drives in place of a person who has difficulty driving, or when operating a vehicle in a dangerous area. For public transportation, where the route and the road to travel are fixed to some extent, for example, cloud-puting-based maneuvering can be applied. In this use case, communication is required to have high reliability and low transmission delay.

(Physical layer enhancement)
Further enhancement of the physical layer from LTE V2X is required to achieve the above requirements. Target links include Uu links and PC5 links (side links). A Uu link is a link between an infrastructure such as a base station or RSU (Road Side Unit) and a terminal device. The PC5 link (side link) is a link between terminal devices. The main points of enhancement are shown below.

Examples of enhancements include:
・ Channel format ・ Side link feedback communication ・ Side link resource allocation method ・ Vehicle position information estimation technology ・ Terminal-to-terminal relay communication ・ Unicast communication, multicast communication support ・ Multicarrier communication, carrier aggregation ・ MIMO / beamforming ・ High frequency frequency support (Example: 6 GHz or higher)
…etc

Examples of the channel format include Flexible numerology, short TTI (Transmission Time Interval), multi-antenna support, and Waveform. Further, examples of the side link feedback communication include HARQ, CSI (Channel Status Information) and the like.

(V2X operation scenario)
An example of the V2X communication operation scenario will be described below. In V2N communication, only DL / UL communication between the base station and the terminal device was simple. On the other hand, in V2V communication, various communication paths can be considered. In the following, each scenario will be described mainly focusing on the example of V2V communication, but the same communication operation can be applied to V2P and V2I. In V2P and V2I, the communication destination is Pedestrian or RSU.

For example, FIGS. 7 to 12 are explanatory diagrams for explaining an example of a V2X operation scenario. Specifically, FIG. 7 shows a scenario in which vehicles directly communicate with each other without going through a base station (E-UTRAN). FIG. 8 shows a scenario in which vehicles communicate with each other via a base station. 9 and 10 show a scenario in which vehicles communicate with each other via a terminal device (UE, here RSU) and a base station. 11 and 12 show a scenario in which vehicles communicate with each other via a terminal device (UE, in this case RSU or another vehicle).

In addition, in FIGS. 7 to 12, the "side link" corresponds to a communication link between terminal devices and is also referred to as PC5. Specific examples of side links include V2V, V2P, and V2I communication links. The "Uu interface" corresponds to a wireless interface between a terminal device and a base station. A specific example of the Uu interface is a V2N communication link. The "PC5 interface" corresponds to a wireless interface between terminal devices.

<< 3. Examination of resource allocation in V2X communication >>
In this disclosure, attention is paid to a resource allocation method of a V2V communication link in NR V2X communication. In conventional side-link communication (particularly V2V), periodic traffic such as periodically broadcasting a safety message to surrounding vehicles has been assumed.

On the other hand, NR V2X is expected to support new use cases such as "Sensor data sharing" and "Advanced driving", and it is possible that the periodicity of traffic will be disrupted. That is, although it is a periodic traffic, it is expected that the traffic contains a jitter component and the timing of the arrival of the packet in the physical layer (that is, the arrival of the packet from the upper layer to the physical layer) is slightly deviated.

As for the packet size, packets of the same size have been mainly assumed in the past, but in a new use case, traffic whose size changes for each packet can be assumed. Such a change in packet size is caused by, for example, that the transmitted data depends on the surrounding environment of the automobile.

For example, FIG. 13 is an explanatory diagram for explaining an outline of the characteristics of packets assumed in NR V2X communication, and schematically shows the difference in traffic between NR V2X communication and conventional side link communication. There is. The upper diagram of FIG. 13 shows an example of the traffic assumed in the conventional side link communication. That is, in the conventional side link communication, it is assumed that the arrival cycle T of the packet from the upper layer to the physical layer and the packet size P of the packet are always constant. On the other hand, the lower figure of FIG. 13 shows an example of the traffic assumed in NR V2X communication. That is, in the NR V2X communication, it is necessary to consider the jitter component α of the arrival cycle T of the packet from the upper layer to the physical layer and the fluctuation component β of the packet size P. Against this background, in NR V2X communication, side-link communication is performed in a more preferable manner even in a situation where the influence of the jitter component α of the packet arrival cycle T and the fluctuation component β of the packet size P becomes apparent. Resource management is required to enable this.

(Existing side link resource allocation method)
Here, the outline of the resource allocation method to the side link will be described. As the method of resource allocation to the side link, the method of "Mode 3 resource allocation" in which the base station allocates the resource of the side link and the method of "Mode 4 resource allocation" in which the terminal device itself senses and selects the resource of the side link. There is. This disclosure mainly focuses on the mode3 resource allocation method.

-Resource pool allocation
Mode3 When allocating resources, the resource pool is allocated in advance. The allocation of the resource pool is performed by, for example, a base station. Further, as another example, the resource pool may be allocated by Preconfiguration.

For example, FIG. 14 is a diagram showing an example of the configuration of resources (resource pools) allocated to side link communication, and shows an example of a case where frequency division multiplexing (FDM) is applied. .. As shown in FIG. 14, the resource pool is divided into an SA (Scheduling Assignment) area and a Data area, and PSCCH (Physical Sidelink Control Channel) and PSCH (Physical Sidelink Shared Channel) are transmitted by each area. In the following, the description will be focused on the case where FDM is applied as shown in FIG. 14, but the application destination of the technology according to the present disclosure is not necessarily limited. As a specific example, even when time division multiplexing (TDM) is applied, it is possible to apply the technique according to the present disclosure described below. When TDM is applied, the SA region and the Data region are orthogonal to each other on the time axis.

-Mode3 resource allocation Next, the outline of Mode3 resource allocation will be explained. First, an example of a general Mode3 resource allocation processing flow will be described with reference to FIG. FIG. 15 is a sequence diagram showing an example of the flow of the Mode3 resource allocation process.

As shown in FIG. 15, when traffic is generated (that is, a packet to be transmitted is generated), the terminal device 200 requests transmission delay via the uplink (PUCCH), packet size, and the like (S101). Information is provided to the base station 100, and the base station 100 is requested to allocate transmission resources (S103). In response to the request from the terminal device 200, the base station 100 allocates the transmission resource to the terminal device 200, that is, schedules the transmission resource (S105), and allocates the transmission resource via the downlink (PDCCH). Is notified to the terminal device 200 (S107). Then, the terminal device 200 transmits the packet by using the resource allocated from the base station 100 (S109).

However, when the method shown in FIG. 15 is adopted, the request for allocation of transmission resources (S103), the scheduling of transmission resources (S105), and the notification of the allocation result of transmission resources (S107) are sent for each packet transmission. Since it is performed, the processing overhead related to scheduling is large.

On the other hand, in V2X, since the main traffic is periodic, for example, SPS (Semi-persistent scheduling) is executed at the time of Mode3 resource allocation, so that the overhead of the processing related to the above scheduling is reduced. It is possible to realize V2X communication. For example, FIG. 16 is a sequence diagram showing another example of the flow of the Mode3 resource allocation process, and shows an example when SPS is executed.

As shown in FIG. 16, when the terminal device 200 connects to the cell, that is, establishes communication with the base station 100 (S151), the terminal device 200 provides UE assistance information to the base station 100 (S153). .. The UE assistance information includes information that can be used by the base station 100 for the SPS (that is, SPS assistance information). For example, FIG. 17 is an explanatory diagram for explaining an outline of SPS assistance information. As shown in FIG. 17, when the packet is generated periodically, the terminal device 200 uses, for example, the traffic cycle T, the offset α with the subframe 0, the packet size P, and the packet as SPS assistance information. Information such as priority is provided to the base station 100.

Next, the base station 100 sets the size of the transmission resource of the terminal device 200 and the SPS cycle (Semi-persistent scheduling Interval) based on the information provided by the terminal device 200 as UE assistance information (S155). .. The base station 100 notifies the terminal device 200 of the information regarding the SPS configuration described above (S157).

Next, when the traffic is generated (that is, the packet to be transmitted is generated), the terminal device 200 requests the base station 100 to allocate the transmission resource (S161). In response to the request from the terminal device 200, the base station 100 instructs the terminal device 200 to perform SPS activation (S163). In response to the instruction from the base station 100, the terminal device 200 selects the resource configured by SPS (S165). Then, the terminal device 200 transmits the packet using the selected resource (S167).

Further, FIG. 18 is a timing chart showing an example of the processing flow when SPS is executed. Specifically, the upper diagram of FIG. 18 shows an example of the relationship between the timing at which each resource is allocated and the size of the resource for the resource configured by the base station 100. The middle diagram of FIG. 18 shows the timing at which each packet arrives and the size of the packet for the packets that periodically arrive from the upper layer to the physical layer (that is, the packet to be transmitted) in the terminal device 200. An example of the relationship is shown. The lower figure of FIG. 18 shows an example of the relationship between the timing at which each resource is allocated and the size of the resource for the resource used for transmitting the packet to be transmitted. That is, the horizontal axes of the upper, middle, and lower rows of FIG. 18 indicate time. The vertical axis of the upper figure of FIG. 18 shows the size of the configured resource. Further, the vertical axis of the middle figure of FIG. 18 shows the size of packets periodically arriving from the upper layer to the physical layer. The vertical axis of the lower figure of FIG. 18 shows the size of the resource used for transmitting the packet to be transmitted. In the following description, the packet arriving from the upper layer to the physical layer in the terminal device 200 may be referred to as an "arrival packet". That is, in the following, when simply describing "arrival packet", unless otherwise specified, it means a packet arriving from the upper layer to the physical layer in the terminal device 200.

When SPS is implemented as shown in FIG. 18, resources are configured in advance according to the transmission cycle P of the terminal device 200 (that is, the arrival cycle P of packets from the upper layer to the physical layer in the terminal device 200). Has been done. Therefore, when the traffic is generated (that is, when the packet to be transmitted is generated), the terminal device 200 can transmit the packet by using the already set resource. That is, the terminal device 200 does not need to request the base station 100 to allocate resources used for transmitting the packet each time the packet is transmitted.

-Mode4 resource allocation Next, an outline of Mode4 resource allocation will be described with reference to FIG. FIG. 19 is an explanatory diagram for explaining an example of an operation timeline when the terminal device transmits a packet based on the Mode4 resource allocation. As shown in FIG. 19, the terminal device 200 that transmits a packet first performs sensing in order to discover a resource used for transmitting the packet from the resource pool. Next, the terminal device 200 selects a resource from the resource pool based on the result of the sensing. Then, the terminal device 200 transmits the packet using the selected resource. Further, at this time, the terminal device 200 reserves a resource to be used for subsequent packet transmission, if necessary.

Here, an example of the above sensing operation will be described with reference to FIG. FIG. 20 is an explanatory diagram for explaining an example of a sensing operation for selecting a resource from the resource pool.

Specifically, the terminal device 200 selects resources in the resource selection window and reserves future resources based on the measurement result of the interference pattern in the sensing window and the resource reservation status in the sensing window. .. As a specific example, in the example shown in FIG. 20, when the packet D to be transmitted is generated, the terminal device 200 uses the future resource usage status, for example, another in the future, based on the sensing result. Predict the resources used to send packets A to C. By using the result of the prediction, the terminal device 200 can select and reserve a resource that can be used for transmitting the packet D, that is, a resource that is predicted not to be used for transmitting another packet. ..

(Technical issues)
As described above, in the conventional side link communication, the packet cycle and the packet size are fixed, so when the resource used for the periodic packet transmission is reserved, the jitter and the change in the packet size are taken into consideration. I didn't have to. That is, in the conventional side link communication, it is sufficient to reserve the resource on the premise that the resource having the same size as the conventional one is transmitted after the packet arrival cycle T has elapsed.

On the other hand, in NR V2X communication, it is necessary to consider the influence of the jitter component α of the packet arrival cycle T and the fluctuation component β of the packet size P, and the same resource allocation method as in the conventional side link communication is applied. Can be difficult.

For example, FIG. 21 is an explanatory diagram for explaining an example of a case where the same resource allocation method as the conventional side link communication is applied to the NR V2X communication (that is, when the conventional SPS is adopted). Is. In FIG. 21, the horizontal axis represents time. The vertical axis indicates the size of the incoming packet (that is, the size of the resource required to transmit the packet).

In FIG. 21, reference numerals C11 to C15 are specific for an example of the relationship between the incoming packet and the resource scheduled (SPS) for transmitting the packet (hereinafter, also referred to as “SPS resource”). An example is shown. For example, the example shown by the reference code C11 shows an example in which the incoming packet can be normally transmitted by using the SPS resource. That is, in the example shown by the reference code C11, the size of the incoming packet and the size of the SPS resource are substantially the same, and the SPS resource is allocated immediately after the generation timing of the incoming packet.

On the other hand, the examples shown by the reference numerals C12, C14, and C15 show an example in which the transmission request of the arrival packet using the SPS resource cannot be satisfied or it becomes difficult to transmit the arrival packet. There is.

Specifically, the example shown by the reference reference numeral C12 shows an example in which the arrival timing of the packet is delayed due to the jitter component α. That is, due to the delay in the arrival timing of the packet, the packet arrives after the timing when the SPS resource is allocated. Therefore, in this case, the terminal device 200 may not be able to find a resource (SPS resource) that can be used for transmitting the packet, and it may be difficult to transmit the packet.

Further, the example shown by the reference code C14 shows an example in which the size of the packet increases due to the packet size fluctuation β and the size exceeds the size of the SPS resource for transmitting the packet. In this case, the terminal device 200 may not be able to secure a resource of a size required for transmitting the packet, which may make it difficult to transmit the packet.

Further, reference numeral C15 indicates an example in which the arrival timing of the packet is earlier than planned due to the jitter component α. As a result, the time difference between the arrival timing of the packet and the timing at which the SPS resource for transmitting the packet is allocated increases, and as a result, between the arrival of the packet and the transmission of the packet. Does not meet the delay requirement of. That is, in this case, it may be difficult for the terminal device 200 to satisfy the request related to the delay among the requests related to the transmission of the packet.

Further, in the example shown by the reference code C13, when only a part of the SPS resource is used for packet transmission, so-called resource usage is wasted (in other words, when resource over-reservation occurs). An example is shown. Specifically, in the example shown by the reference code C13, the size of the packet is reduced due to the packet size fluctuation β, and a part of the SPS resources reserved for transmitting the packet is used for transmitting the packet. An example is shown when it is not used. That is, in this case, a part of the reserved SPS resources is not used, so that the use of the resources is wasted.

In view of the above circumstances, the present disclosure proposes a technique that enables more flexible resource allocation in inter-device communication such as V2X communication. Specifically, the present disclosure proposes a technique for allocating resources to side links that can more flexibly respond to changes in packet arrival cycle T jitter and packet size P.

<< 4. Technical features >>
Subsequently, as a technical feature of the system according to the present disclosure, allocation of resources that can be used for inter-device communication that can more flexibly respond to jitter in the packet arrival cycle T and changes in the packet size P (for example, , Allocation of resources to side links) An example of the technology will be described. Specifically, as an example of the technology for allocating resources, the following two approaches will be described respectively.
-Proactive type resource allocation-Reactive type resource allocation

<4.1. Proactive type resource allocation>
First, as a Proactive type resource allocation, an example of a method of allocating (reserving) resources in advance in consideration of the jitter of the packet arrival cycle T and the change of the packet size P will be described.

(Basic idea)
First, an overview of the basic concept of Proactive resource allocation will be given. For example, FIG. 22 is an explanatory diagram for explaining an outline of Proactive type resource allocation. As shown in FIG. 22, in the Proactive type resource allocation (in other words, resource reservation), the base station considers the jitter component α of the packet arrival cycle T in the terminal device and the fluctuation component β of the packet size P. , Control the range for reserving resources (hereinafter, also referred to as "reserved resource range"). As a specific example, the base station allows the time of the reserved resource so that the timing shift of the arrival of the packet in the terminal device, that is, the jitter component α (α_min <α <α_max) of the arrival cycle T of the packet is allowed. Control so that the axial range is wider. Further, the base station has a reserved resource size (in other words, an allowed reserved resource size) so that a change in packet size P (P_min <P <P_max) according to the variable component β in the terminal device is allowed. Range) is controlled. Therefore, in the following description, when the term "reserved resource range" is described, unless otherwise specified, the range of the reserved resource in the time axis direction and the allowable range of the reserved resource size are defined. Both may be included.

As described above, the base station allocates (reserves) resources that can be used by the terminal device for periodic packet transmission in consideration of jitter and packet size fluctuations on the terminal device side in advance. Therefore, the terminal device can transmit the packet by using at least a part of the resources reserved by the base station even if the packet transmission timing shift or the packet size fluctuates. Become.

(Processing flow)
Subsequently, with reference to FIG. 23, an example of a series of processing flows of the system according to the embodiment of the present disclosure in the case where the Proactive type resource allocation is performed will be described. FIG. 23 is a sequence diagram showing an example of a series of processing flows of the system according to the embodiment of the present disclosure.

As shown in FIG. 23, when the terminal device 200 (notification unit 247) connects to the cell, that is, establishes communication with the base station 100 (S201), it provides UE assistance information to the base station 100. Provided (S203). The UE assistance information includes information that can be used by the base station 100 for the SPS (that is, SPS assistance information). note that. Details of UE assistance information and SPS assistance information will be described later with specific advantages. As described above, the information notified from the terminal device 200 to the base station 100, that is, the information included in the UE assistance information (particularly, SPS assistance information) corresponds to an example of the "first information".

The base station 100 (information acquisition unit 153) acquires UE assistance information from the terminal device 200 (S203). Based on the information provided as UE assistance information from the terminal device 200, the base station 100 (communication control unit 151) sets the resources used by the terminal device 200 for transmitting packets, that is, the scheduling (SPS) of the resources. I do. As a specific example, the base station 100 (communication control unit 151) sets the size of the reserved resource, the cycle of the reserved resource (that is, the SPS cycle), the range of the reserved resource, and the like. Then, the base station 100 (notification unit 155) notifies the terminal device 200 of the information regarding the SPS configuration described above (S207). As described above, the information notified from the base station 100 to the terminal device 200, that is, the information regarding the SPS configuration (in particular, the information regarding the range of the reserved resource) is an example of the "second information". Equivalent to.

Next, when the traffic is generated (that is, the packet to be transmitted is generated), the terminal device 200 (notification unit 247) requests the base station 100 to allocate the transmission resource (S211). In response to the request from the terminal device 200, the base station 100 (notification unit 155) instructs the terminal device 200 to perform SPS activation (S213). In response to the instruction from the base station 100, the terminal device 200 selects the resource configured by SPS (S215). At this time, the terminal device 200 selects a resource to be used for packet transmission from the range of the reserved resource based on the information regarding the SPS setting notified in advance. Then, the terminal device 200 (communication control unit 241) transmits the packet using the selected resource (S217).

As described above, with reference to FIG. 23, an example of a series of processing flows of the system according to the embodiment of the present disclosure in the case where the Proactive type resource allocation is performed has been described.

(UE assistance information)
In one embodiment of the present disclosure, an example of information provided by the terminal device 200 to the base station 100 as UE assistance information in the system will be described.

The terminal device 200 provides the base station 100 with at least one of information regarding the jitter component α of the packet arrival cycle T and information regarding the variable component β of the packet size P as UE assistance information. In addition to the above, the terminal device 200 may also provide the information provided as UE assistance information in the conventional system to the base station 100 in the system according to the embodiment of the present disclosure.

Examples of the information regarding the jitter component α of the packet arrival cycle T include the following information. Of course, the information shown below is only an example, and if the base station 100 can recognize the jitter of the packet arrival cycle in the terminal device 200, the terminal device 200 provides the information to the base station 100. The information is not necessarily limited to:
・ Minimum value of jitter component α α_min
-Maximum value α_max of jitter component α
・ Average of jitter component α ・ Dispersion value of jitter component α

Examples of the information regarding the variable component β of the packet size P include the following information. Of course, the information shown below is only an example, and if the base station 100 can recognize the fluctuation of the packet size in the terminal device 200, the information provided from the terminal device 200 to the base station 100 is Not necessarily limited to:
-Minimum value β_min of the variable component β of the packet size P
-Maximum value β_max of variable component β of packet size P
-Average of the variable component β of the packet size P-Dispersion value of the variable component β of the packet size P

As described above, in one embodiment of the present disclosure, an example of information provided by the terminal device 200 as UE assistance information to the base station 100 in the system has been described.

(SPS configuration)
In one embodiment of the present disclosure, an example of an SPS configuration in which the base station 100 controls based on UE assistance information will be described.

The base station 100 allocates an SPS resource to the terminal device (that is, reserves the resource) based on the UE assistance information provided by the terminal device 200. At this time, the base station 100 may transmit the terminal device 200 as a range of reserved resources (in other words, a range in which SPS resources are allocated) based on the jitter component α and the fluctuation component β of the packet. Reserve resources so that a continuous range is secured in a certain time direction and frequency direction. As a specific example, the range of reserved resources is controlled according to the range of the assumed jitter component α (α_min <α <α_max) and the range of the assumed packet size P (P_min <P <P_max). NS.

Further, the base station 100 may allocate resources (that is, reserve resources) in consideration of at least one of the following information in addition to the above-mentioned UE assistance information.
・ CBR (Channel Busy Ratio)
-Packet priority information-Operation service type-Packet type information-Terminal device location information-Terminal device speed

As a specific example, the base station 100 may determine the range of reserved resources according to the CBR (bandwidth congestion) measured in the frequency band used. As a more specific example, the base station 100 controls so that the range of reserved resources becomes wider when the CBR is lower than the threshold value (non-congestion situation), and when the CBR is higher than the threshold value (congestion situation). In, the range of reserved resources may be controlled to be more limited.

Further, as another example, the base station 100 may determine the range of reserved resources according to the priority of packets. As a more specific example, the base station 100 controls the reserved resource range to be wider for high-priority packets and the reserved resource range to be more limited for low-priority packets. You may control it.

Further, as another example, the base station 100 may determine the range of reserved resources according to the type of operation service such as "Sensor data sharing" or "Automated driving".

Further, as another example, the base station 100 may determine the range of reserved resources according to packet type information such as eMBB (enhanced Mobile Broadband) and URLLC (Ultra Reliable Low Latency Communication).

Further, as another example, the base station 100 may determine the range of reserved resources according to the position information of the terminal device 200. As a more specific example, when an automobile (corresponding to a terminal device 200) is running on a highway, jitter and transmission packet size fluctuations may become smaller, so that the base station 100 reserves the reservation. It may be controlled so that the range of resources is limited. Further, under the situation where the automobile is traveling around the intersection, jitter and the fluctuation of the size of the transmission packet may become larger. Therefore, the base station 100 controls so that the range of the reserved resource becomes wider. You may.

Further, as another example, the base station 100 may determine the range of reserved resources according to the speed of the terminal device 200. As a more specific example, in a situation where an automobile (corresponding to a terminal device 200) is traveling at a low speed such as during a traffic jam, jitter and fluctuations in the size of transmitted packets may become smaller, so that the base station 100 may be controlled so that the range of reserved resources is limited. On the other hand, under the situation where the automobile is traveling at high speed, the base station 100 may be controlled so that the range of reserved resources becomes wider.

As described above, an example of the SPS configuration (SPS configuration) controlled by the base station 100 based on the UE assistance information in the system according to the embodiment of the present disclosure has been described.

(Resource selection)
In one embodiment of the present disclosure, an operation related to resource selection by the terminal device 200 in the system will be described with an example.

In the conventional mode 3, the base station 100 allocates only the resources necessary for the terminal device 200 to transmit the packet. On the other hand, as described above, the base station 100 according to the embodiment of the present disclosure allocates more resources to the terminal device 200 than before when the Proactive type resource allocation is performed. That is, more resources are reserved for the terminal device 200 than the resources that the terminal device 200 will actually use to transmit the packet. Therefore, the terminal device 200 selects at least a part of the resources reserved by the base station 100 as resources to be used for packet transmission.

The base station 100 may instruct the terminal device 200 to select a resource to be used for transmitting a packet. In this case, the base station 100 may notify the terminal device of the resource selection method by using, for example, SIB, RRC, PBCH, PDCCH, PDSH, or the like. Further, as another example, the method of selecting the resource to be used for transmitting the packet may be preconfigured in the terminal device 200.

Next, a method of selecting a resource to be used for transmitting a packet will be described with a specific example.

・ Random selection
For example, the terminal device 200 may randomly select a resource to be used for transmitting a packet.

・ Sensing based selection
As another example, the terminal device 200 may sense the usage status of resources by another terminal device 200, and select a resource to be used for packet transmission based on the result of the sensing. In this case, for example, the base station 100 may notify (instruct) whether or not to perform sensing to the terminal device 200.

Further, in this case, the base station 100 may share the number of terminal devices (in other words, resources may be shared) to which the same SPS configuration (SPS configuration) as that of the target terminal device 200 is applied. Depending on the number of terminal devices), it may be determined whether or not to instruct the target terminal device 200 to execute sensing. As a more specific example, the base station 100 is a target terminal when the number of terminal devices to which the same SPS configuration (SPS configuration) as that of the target terminal device 200 is applied is equal to or less than the threshold value. It is not necessary to instruct the device 200 to execute sensing.

Further, the base station 100 may notify the terminal device 200 of the area to be sensed by the terminal device 200.

Further, the base station 100 is a terminal to which the same or a part of the same SPS configuration as the target terminal device 200 is applied (in other words, a terminal in which resources may be shared). The number of devices) may be notified to the target terminal device 200. In this case, the target terminal device 200 may decide whether or not to perform sensing according to the number of the terminal devices notified from the base station 100. In this case, the base station 100 may notify the target terminal device 200 of information regarding conditions for determining whether or not the target terminal device 200 performs sensing. As a more specific example, the base station 100, as information on the above conditions, determines the relationship between whether or not sensing is performed and the number of terminal devices to which the same or partially similar SPS settings are applied. The indicated information may be notified to the target terminal device 200. Further, as another example, the information regarding the above conditions may be preconfigured in the terminal device 200.

-Selection of resources according to the timing at which a packet can be transmitted As another example, the terminal device 200 may select a resource to be used for transmitting the generated packet according to the timing at which the generated packet can be transmitted. As a specific example, the terminal device 200 may select a resource capable of transmitting the generated packet in the shortest time as a resource used for transmitting the packet.

• Selecting resources according to the level associated with each resource As another example, the range of reserved resources is set to include multiple partial ranges with different levels among multiple levels. May be good. In other words, the SPS resource reserved by the base station 100 may be divided into a plurality of resource blocks, and different levels among the plurality of levels may be set for each resource block. For example, FIGS. 24 to 26 are explanatory diagrams for explaining an example of a level setting method for a resource block divided from an SPS resource.

Specifically, FIG. 24 shows the reserved SPS resource (in other words, the reserved range of the resource) in a plurality of resource blocks according to the probability density function of the jitter component α of the packet arrival cycle T in the terminal device 200. An example of the case of division is shown. As a more specific example, in the example shown in FIG. 24, the level is set according to the average or the variance value of the probability density function of the jitter component α, and the reserved SPS resources are a plurality of resources according to the level. An example of the case where the block (that is, the resource block corresponding to each of the levels 1 to 3) is divided is shown. In the example shown in FIG. 24, the resource block for which level 1 is set corresponds to the resource block in which the packet is likely to be transmitted. On the other hand, a resource block for which level 3 is set corresponds to a resource block in which a packet is unlikely to be transmitted.

Further, FIG. 25 shows a case where the reserved SPS resource (in other words, the reserved range of the resource) is divided into a plurality of resource blocks according to the probability density function of the variable component β of the packet size P of the packet in the terminal device 200. An example is shown. As a more specific example, in the example shown in FIG. 25, the level is set according to the average or the variance value of the probability density function of the variable component β, and the reserved SPS resources are a plurality of resources according to the level. An example of the case where the block (that is, the resource block corresponding to each of levels 1 to 3) is divided is shown. In the example shown in FIG. 25, the resource block for which level 1 is set corresponds to the resource block in which the packet is likely to be transmitted. On the other hand, a resource block for which level 3 is set corresponds to a resource block in which a packet is unlikely to be transmitted.

Further, FIG. 26 shows the reserved SPS resource (in other words, the reserved range of the resource), the probability density function of the jitter component α of the packet arrival cycle T in the terminal device 200, and the fluctuation component β of the packet size P of the packet. An example of the probability density function of is divided into a plurality of resource blocks according to the above is shown. As a more specific example, in the example shown in FIG. 26, the level is set according to the average and the variance value of the probability density functions of the jitter component α and the fluctuation component β, and the reserved SPS resource is the level. An example is shown in the case where the resource blocks are divided into a plurality of resource blocks (that is, resource blocks corresponding to each of the levels 1 to 3) according to the above. In the example shown in FIG. 26, the resource block for which level 1 is set corresponds to the resource block in which the packet is likely to be transmitted. On the other hand, a resource block for which level 3 is set corresponds to a resource block in which a packet is unlikely to be transmitted.

In this case, when the base station 100 allocates the SPS resource to the terminal device 200 (that is, when the terminal device 200 reserves a available resource), the base station 100 divides the SPS resource into a plurality of resource blocks. Associate the above level with each resource block. The conditions for dividing the SPS resource into a plurality of resource blocks (for example, the number of divisions, the division size, the upper limit of the number of divisions, the upper limit of the division size, etc.) may be appropriately changed depending on the situation. Then, even if the base station 100 notifies the terminal device 200 of the information about the resource block in which the SPS resource is divided (for example, the time and frequency information) and the information about the level associated with each resource block. good.

Further, when selecting a resource, the terminal device 200 determines which of the plurality of levels is selected from the resource block associated with the resource block to be used for packet transmission according to a predetermined condition. You may. As a specific example, the terminal device 200 may select a resource from a resource block having a higher level among a plurality of resource blocks. Further, as another example, the terminal device 200 may select a resource from a resource block having a lower level among a plurality of resource blocks.

Further, depending on the level, conditions (constraints) regarding the use of the resource block according to the level may be set individually. As a specific example, depending on the level, the condition may be set so that the use of the resource block according to the level is classified into exclusive use (Exclusive) and inclusive use (Inclusive). Specifically, when exclusive use is set for a level, the resource block corresponding to the level is used exclusively by the target terminal device 200. Conditions are limited. On the other hand, when comprehensive use is set for a level, the resource block corresponding to that level is a resource block of resources by another terminal device even when a reservation is made for one terminal device 200. The conditions for using the resource blocks are relaxed so that the overlap of selectable resource blocks is allowed. For example, Table 1 below is an example of the correspondence between the above levels and the classification of the levels.

As described above, as the Proactive type resource allocation, an example of a method of allocating (reserving) resources in advance in consideration of the jitter of the packet arrival cycle T and the change of the packet size P will be described with reference to FIGS. 22 to 26. did.

<4.2. Reactive type resource allocation>
Next, the Reactive type resource allocation will be described. In the Reactive type resource allocation, as with the conventional SPS, resources are reserved so that the cycle and packet size are constant, and then resources are allocated separately when a problem occurs during packet transmission. It is said.

(overview)
First, an outline of Reactive type resource allocation will be described. For example, FIG. 27 is an explanatory diagram for explaining the outline of the Reactive type resource allocation, and shows an example of a series of processing flow of the terminal device when the Reactive type resource allocation is performed.

As shown in FIG. 27, when the traffic is generated (that is, the packet to be transmitted is generated), the terminal device 200 can transmit the packet by using the SPS resource reserved by the base station 100 (S251). Check whether or not (S253). As a specific example, when the size of the packet exceeds the size of the SPS resource and, as a result, the resource for transmitting the packet is insufficient, the terminal device 200 uses the SPS resource to obtain the packet. May be determined to be difficult to send. Further, when the terminal device 200 uses the SPS resource for transmitting the packet and it is difficult to satisfy the request for the transmission delay (Latency), the terminal device 200 may transmit the packet by using the SPS resource. You may decide that it is difficult.

When the terminal device 200 can transmit a packet using the SPS resource (S253, YES), the terminal device 200 uses the SPS resource to transmit the packet to be transmitted (S257).

On the other hand, when it is difficult to transmit a packet using the SPS resource (S253, NO), the terminal device 200 acquires a new resource to transmit the packet (S255). In addition, as a method of acquiring a new resource for the terminal device 200 to transmit a packet, "a method of requesting resource allocation from a base station" and "a method of selecting a resource by the terminal device itself" are mainly mentioned. Be done. The details of these methods will be described later. Then, the terminal device 200 transmits the packet to be transmitted by using the newly acquired resource (S257).

The outline of the Reactive type resource allocation has been described above with reference to FIG. 27.

(How to request resource allocation from the base station)
Subsequently, as an example of a method in which the terminal device 200 acquires a new resource for transmitting a packet, a method in which the terminal device 200 requests the base station 100 to allocate a resource will be described.

(A-1) Method of Allocating Requested Resources First, when the base station 100 is requested to allocate resources by the terminal device 200, the requested resource, that is, the terminal device 200 at that time tries to transmit. An example of allocating a resource for transmitting an existing packet will be described. For example, FIG. 28 is a flowchart showing an example of a series of processing flows of the terminal device 200 when a Reactive type resource allocation is performed. Specifically, FIG. 28 shows an example of a series of processing flows of the terminal device 200 when the terminal device 200 requests the base station 100 to allocate resources.

As shown in FIG. 28, when the traffic is generated (S301), the terminal device 200 confirms whether or not the packet can be transmitted by using the SPS resource reserved by the base station 100 (S303). When the terminal device 200 can transmit a packet using the SPS resource (S303, YES), the terminal device 200 uses the SPS resource to transmit the packet to be transmitted (S307). This operation is the same as the example described with reference to FIG. 27.

On the other hand, when it is difficult to transmit a packet using the SPS resource (S303, NO), the terminal device 200 requests the base station 100 to allocate the resource (S305). In this case, the terminal device 200 may provide the base station 100 with information on the required value of the transmission delay, the size of the packet, and the like for the packet to be transmitted at that time, for example. Further, the terminal device 200 may provide the base station 100 with information regarding the jitter component α of the packet arrival cycle T, the fluctuation component β of the packet size P, and the like.

In response to the above request from the terminal device 200, the base station 100 allocates a resource for transmitting the packet that the terminal device 200 is trying to transmit at that time. At this time, the base station 100 may additionally allocate a resource having a size that is insufficient when the packet is transmitted by the SPS resource that has already been reserved. Specifically, when the terminal device 200 intends to transmit packets for 15 resource blocks in a situation where SPS resources for 10 resource blocks are reserved, the base station 100 is in short supply5. A resource block is newly assigned to the terminal device 200. In this case, the terminal device 200 transmits the packet using the already reserved SPS resource and the newly allocated resource (S307).

Further, as another example, the base station 100 may newly allocate a resource for transmitting the packet that the terminal device 200 is trying to transmit at that time, in addition to the SPS resource that has already been reserved. Specifically, when the terminal device 200 intends to transmit packets for 15 resource blocks, the base station 100 newly adds 15 resource blocks to the terminal device 200 in addition to the already reserved SPS resources. May be assigned to. In this case, the terminal device 200 transmits the packet using the newly allocated resource (S307).

In this case, the SPS resource reserved by the base station 100 corresponds to an example of the "first resource", and the resource that the terminal device 200 requests the base station 100 to allocate separately from the SPS resource is ". It corresponds to "the second resource".

(A-2) Method of Reconfiguring SPS in addition to Allocation of Requested Resources Subsequently, when the base station 100 is requested to allocate resources by the terminal device 200, the requested resource allocation is performed. In addition to this, an example of reconfiguring the SPS (that is, reconfiguring the SPS configuration) will be described. For example, FIG. 29 is a flowchart showing another example of a series of processing flows of the terminal device 200 when a Reactive type resource allocation is performed. Specifically, FIG. 29 shows an example of a series of processing flows of the base station 100 when the terminal device 200 requests the base station 100 to allocate resources. Since the operation of the terminal device 200 is the same as the example described with reference to FIG. 28, detailed description thereof will be omitted.

As shown in FIG. 29, when the base station 100 receives a request from the terminal device 200 to allocate a resource used for transmitting a packet (S351), the base station 100 newly allocates a resource to the terminal device 200 (S353). This operation is the same as the example described with reference to FIG. 28. That is, the base station 100 may additionally allocate a resource having a size that is insufficient when the packet is transmitted by the SPS resource that has already been reserved. Further, the base station 100 may newly allocate a resource for the terminal device 200 to transmit the packet, in addition to the SPS resource.

Next, the base station 100 estimates the future situation regarding the periodic packet transmission by the terminal device 200, and determines whether or not to reset the SPS (that is, whether or not to reset the SPS configuration). (S355).

For example, the base station 100 may determine whether or not to set the SPS again according to the content of the above request from the terminal device 200. As a specific example, the base station 100 has an SPS when the required value of the transmission delay for the terminal device 200 to transmit a packet and the packet size deviate from the current SPS setting value by a certain amount or more. It may be determined that the setting of is performed again. As a specific example, it is assumed that 30 resource blocks are required by the request from the terminal device 200 in a situation where 10 resource blocks of SPS resources are reserved. At this time, if the shortage of 20 resource blocks exceeds the threshold value, the base station 100 will set the SPS again.

Further, as another example, the base station 100 may determine whether or not to set the SPS again according to the number of requests from the terminal device 200.

Further, as another example, the base station 100 determines whether or not to set the SPS again according to the type of service provided by the terminal device 200 (that is, the service type associated with the terminal device 200). You may. As a specific example, when the base station 100 receives a request from the terminal device 200 for transmitting a high-priority message, the base station 100 may set the SPS again after estimating the future situation.

Next, an example of the setting method when the SPS is set again will be described. For example, the base station 100 may update the SPS settings based on the required values of various settings for the terminal device 200 to transmit packets.

As a specific example, it is assumed that 15 resource blocks are required in response to a request from the terminal device 200 in a situation where 10 resource blocks of SPS resources are reserved. In this case, for example, the base station 100 anticipates that the terminal device 200 allocates 15 resource blocks for transmitting the packet, and further, the same size is required for the subsequent periodic packet transmission. The size of the SPS resource may be updated to 15 resource blocks.

Further, the base station 100 may update the SPS setting in consideration of the jitter component α of the packet arrival cycle T in the terminal device 200, the fluctuation component β of the packet size P, and the like. As a specific example, in a situation where 10 resource blocks of SPS resources are reserved, 15 resource blocks are required due to a request from the terminal device 200, and in anticipation of the amount of packet size fluctuation up to that point. It is assumed that 20 resource blocks are required. In this case, the terminal device 200 requests the base station 100 to allocate resources (15 resource blocks) necessary for transmitting the packet, and further notifies the base station 100 of information on the amount of packet size fluctuation. .. For example, the base station 100 allocates 15 resource blocks for the terminal device 200 to transmit a packet, and further sets the size of the SPS resource to 20 resources in anticipation of the packet size fluctuation in the subsequent periodic packet transmission. It may be updated to a block. Further, when the base station 100 acquires information on the jitter component of the packet arrival cycle from the terminal device 200, the base station 100 updates the timing (position in the time axis direction) of allocating the SPS resource according to the jitter component. , The range in the time axis direction to which the SPS resource is allocated may be controlled. That is, the base station 100 may reserve the SPS resource according to the jitter component of the packet arrival cycle in the same manner as in the above-mentioned example as "Proactive type resource allocation" in response to the request from the terminal device 200. good.

(How the terminal device itself selects the resource)
Subsequently, as an example of a method in which the terminal device 200 acquires a new resource for transmitting a packet, a method in which the terminal device 200 itself newly selects a resource to be used for transmitting the packet will be described.

First, with reference to FIG. 30, an outline will be described with reference to an example of a series of processing flows of the terminal device 200 when the terminal device 200 itself newly selects a resource to be used for transmitting a packet. FIG. 30 is a flowchart showing another example of the flow of a series of processes of the terminal device 200 when the Reactive type resource allocation is performed. Specifically, FIG. 30 shows an example of a series of processing flows of the terminal device 200 when the terminal device 200 itself newly selects a resource to be used for transmitting a packet.

As shown in FIG. 30, when a packet to be transmitted is generated (S401), the terminal device 200 confirms whether or not the packet can be transmitted by using the SPS resource reserved by the base station 100 (S403). ). When the terminal device 200 can transmit a packet using the SPS resource (S403, YES), the terminal device 200 uses the SPS resource to transmit the packet to be transmitted (S407).

On the other hand, when it is difficult for the terminal device 200 to transmit a packet using the SPS resource (S403, NO), the terminal device 200 selects a new resource for transmitting the packet (S405). At this time, the terminal device 200 may select a part of the resources reserved in advance by the base station 100 as the resources to be used for packet transmission. Further, as another example, the terminal device 200 may select a resource other than the resource reserved in advance by the base station 100 as a resource to be used for packet transmission. The details of the resource selection method by the terminal device 200 will be described later with specific examples. Then, the terminal device 200 transmits the packet by using the newly selected resource (S407).

In this case, the SPS resource reserved by the base station 100 corresponds to an example of the "first resource", and the resource newly selected by the terminal device 200 separately from the SPS resource is the "second resource". Corresponds to.

Subsequently, a method of selecting a resource to be used for transmitting a packet will be described with a specific example.

(B-1) Random selection
For example, the terminal device 200 may randomly select a resource to be used for transmitting a packet. At this time, the terminal device 200 may select a resource that may be used by another terminal device 200.

(B-2) Sensing based selection
As another example, the terminal device 200 may sense the usage status of resources by another terminal device 200, and select a resource to be used for packet transmission based on the result of the sensing. At this time, the terminal device 200 may select a resource that may be used by another terminal device 200.

(B-3) Selection of Resources According to Timing at which Packets Can Be Transmitted As another example, the terminal device 200 selects resources to be used for transmitting the generated packets according to the timing at which the generated packets can be transmitted. You may. As a specific example, the terminal device 200 may select a resource capable of transmitting the generated packet in the shortest time as a resource used for transmitting the packet. At this time, the terminal device 200 may select a resource that may be used by another terminal device 200.

(B-4) Selection of Resources from Backup Resource Pool (BRP) Further, even if the terminal device 200 selects a resource to be used for packet transmission from the resource pool reserved in advance by the base station 100 for backup. good. In the following description, the resource pool secured in advance by the base station 100 for backup is also referred to as a “backup resource pool (BRP)”.

For example, FIG. 31 is a sequence diagram showing an example of a processing flow related to the setting of the backup resource pool (BRP). As shown in FIG. 31, when the terminal device 200 connects to the cell, that is, establishes communication with the base station 100 (S451), the terminal device 200 provides UE assistance information to the base station 100 (S453). .. The UE assistance information includes information that can be used by the base station 100 for the SPS (that is, SPS assistance information). The base station 100 sets the SPS based on the information provided as UE assistance information from the terminal device 200 (S455). That is, the base station 100 determines, for example, the size of the SPS resource and the SPS cycle, and allocates the SPS resource.

Further, the base station 100 sets the BRP in addition to the setting of the SPS. At this time, the base station 100 may set a part of the common resource pool configured for the terminal device 200 that performs inter-device communication such as V2X communication as BRP.

Further, for example, the base station 100 may set a BRP common to a plurality of terminal devices 200 (and by extension, all terminal devices 200). Further, as another example, the base station 100 may set different BRPs for each of the plurality of terminal devices 200. As a specific example, when the arrival timing of packets in each of the plurality of terminal devices 200 is different, the base station 100 causes each terminal device 200 to be on the time axis according to the arrival timing in the terminal device 200. A BRP in which the position of is adjusted may be set.

Further, the base station 100 may change the BRP setting (for example, the position and size on the time axis) depending on the situation. In this case, for example, the base station 100 responds to information such as the number of terminal devices 200 for setting BRP, priority information of transmitted messages, service type, running environment of the terminal device 200, running speed of the terminal device 200, and the like. Then, the BRP setting may be updated. Of course, the base station 100 does not have to change the BRP setting.

Then, as shown in FIG. 31, the base station 100 notifies the terminal device 200 of information (SPS & BRP resource allocation) regarding each of the allocated SPS resources and BRP (S457).

As described above, the terminal device 200 can select, for example, a resource to be used for transmitting the packet from the BRP when it is difficult to transmit the packet using the SPS resource.

As a specific example, when it is difficult for the terminal device 200 to satisfy the transmission delay (Latency) request when using the SPS resource for packet transmission, the terminal device 200 selects the resource to be used for transmitting the packet from BRP. You may.

Further, as another example, when the size of the packet exceeds the size of the SPS resource and, as a result, the resource for transmitting the packet is insufficient, the terminal device 200 uses the resource for transmitting the packet. May be selected from BRP. At this time, the terminal device 200 may additionally select a resource having a size insufficient when the packet is transmitted by the SPS resource from the BRP. In this case, the terminal device 200 may transmit the packet by using the SPS resource and the resource additionally selected from the BRP. Further, as another example, the terminal device 200 may select a resource for transmitting a packet from the BRP separately from the SPS resource. In this case, the terminal device 200 may transmit the packet by using the resource selected from the BRP instead of the SPS resource.

(B-5) Selection of Resources Not Used by Other Terminal Devices As another example, the terminal device 200 is not used by the other terminal device 200 by recognizing the situation regarding resource selection by the other terminal device 200. You may select a resource.

For example, FIG. 32 is a flowchart showing another example of a series of processing flow of the terminal device 200 when the Reactive type resource allocation is performed. Specifically, FIG. 32 shows another example of a series of processing flows of the terminal device 200 when the terminal device 200 itself newly selects a resource to be used for transmitting a packet, in other words. , An example is shown in the case where the terminal device 200 selects a resource that is not used by another terminal device 200.

As shown in FIG. 32, the terminal device 200 acquires information regarding the SPS configuration (SPS Configuration) corresponding to the other terminal device 200 (S501). As a result, the terminal device 200 can recognize resources that are not used by the other terminal device 200 based on the acquired information. In this case, for example, the terminal device 200 may recognize resources that are not used by the other terminal device 200 based on the above information transmitted (for example, broadcast) from the base station 100. Further, as another example, the terminal device 200 may share information regarding the setting of the SPS corresponding to each other with the other terminal device 200. In this case, the base station 100 may configure the SPS using a common SPS Cell RNTI for each of the plurality of terminal devices 200 that share the above information with each other. At this time, the base station 100 does not have to scramble the SPS Cell RNTI. Further, when scrambling the SPS Cell RNTI, the base station 100 may use a common scrambling sequence for each of the plurality of terminal devices 200 that share the above information with each other.

Next, when a packet to be transmitted is generated, the terminal device 200 confirms whether or not the packet can be transmitted by using the SPS resource (S503). When the terminal device 200 can transmit a packet using the SPS resource (S403, YES), the terminal device 200 selects the SPS resource (S505) and transmits the packet to be transmitted (S509).

On the other hand, when it is difficult for the terminal device 200 to transmit a packet using the SPS resource (S503, NO), the terminal device 200 uses the resource that is not used by the other terminal device 200 recognized based on the above information. It may be selected as a resource used for transmission of (S507). Then, the terminal device 200 transmits the packet by using the selected resource (that is, a resource that is not used by the other terminal device 200) (S509).

The terminal device 200 for which information regarding the SPS setting is to be shared may be set based on predetermined conditions.

As a specific example, the terminal device 200 for which the information is shared may be set according to the attributes of the packet transmitted by the terminal device 200. As a more specific example, a plurality of terminal devices 200 having similar (and substantially equal) distributions of packet arrival times may be set as targets for sharing the above information. Further, as another example, a plurality of terminal devices 200 having similar (and substantially equal) packet size distributions may be set as targets for sharing the above information. Further, as another example, a plurality of terminal devices 200 having substantially the same packet priority information may be set as targets for sharing the above information. Further, as another example, a plurality of terminal devices 200 having substantially the same type of service (service type) to be provided may be set as targets for sharing the above information.

Further, the terminal device 200 for which the information is shared may be set according to the degree of interference between the plurality of terminal devices 200. As a more specific example, a plurality of terminal devices 200 that are less likely to interfere with each other may be set as targets for sharing the above information.

-Supplement The above-mentioned selection method is merely an example, and does not necessarily limit the resource selection method by the terminal device 200 itself. As a specific example, it is also possible to combine two or more selection methods from the above-mentioned examples of selection methods. As a more specific example, the terminal device 200 may randomly select a resource to be used for transmitting a packet from the backup resource pool.

<4.3. Modification example>
Subsequently, a modified example of the system according to the present disclosure will be described.

When the above-mentioned Reactive type resource allocation is performed, it is possible that resources that are not secured in advance are used, so packets such as periodic packet transmission failing every time. There is a possibility that the transmission of will fail continuously. Therefore, in view of such a situation, if it is estimated that the terminal device 200 may fail in the subsequent packet transmission with the SPS setting at that time, the terminal device 200 informs the base station 100 to that effect. By reporting, the base station 100 may be requested to reset the SPS. Further, the base station 100 may reset the SPS based on its own judgment, not limited to the request from the terminal device 200.

(Processing of terminal equipment)
Here, with reference to FIGS. 33 and 34, an example of a series of processing flows of the terminal device 200 in the system according to the modified example will be described. For example, FIG. 33 is a flowchart showing an example of a series of processing flows of the terminal device 200 in the system according to the modified example.

In the example shown in FIG. 33, when the traffic is generated (that is, the packet to be transmitted is generated), the terminal device 200 transmits the packet by using the SPS resource reserved by the base station 100 (S551). Confirm whether it is possible (S553). When the terminal device 200 can transmit a packet using the SPS resource (S553, YES), the terminal device 200 uses the SPS resource to transmit the packet to be transmitted (S561).

On the other hand, when it is difficult for the terminal device 200 to transmit a packet using the SPS resource (S553, NO), the terminal device 200 transmits the packet as described above as an example of "Reactive type resource allocation". Get the resources available to (S555). Further, the terminal device 200 determines whether or not subsequent packet transmission is possible (that is, whether or not periodic packet transmission is possible thereafter) based on the SPS setting at that time, and the result of the determination is Is determined to be reported to the base station 100 (S557). A detailed example of a method for determining whether or not a packet can be transmitted will be described later.

Then, when the terminal device 200 determines that the report to the base station 100 is required (S557, YES), the terminal device 200 reports to the base station 100 that the subsequent packet transmission may fail (S559). , The above packet is transmitted using the newly acquired resource (S561). On the other hand, when the terminal device 200 determines that the report to the base station 100 is unnecessary (S559, NO), the terminal device 200 transmits the packet by using the newly acquired resource without making the report (S559, NO). S561).

Further, FIG. 34 is a flowchart showing another example of a series of processing flows of the terminal device 200 in the system according to the modified example.

In the example shown in FIG. 34, when the traffic is generated (that is, the packet to be transmitted is generated), the terminal device 200 transmits the packet by using the SPS resource reserved by the base station 100 (S601). Check whether it is possible (S603). When the terminal device 200 can transmit a packet using the SPS resource (S603, YES), the terminal device 200 uses the SPS resource to transmit the packet to be transmitted (S605).

On the other hand, when it is difficult for the terminal device 200 to transmit a packet using the SPS resource (S603, NO), the terminal device 200 transmits the packet as described above as an example of "Reactive type resource allocation". Get the resources available to (S607). Then, the terminal device 200 transmits the packet using the newly acquired resource (S609).

Next, the terminal device 200 determines whether or not subsequent packet transmission is possible based on the SPS setting at that time, and determines whether or not to report the result of the determination to the base station 100 (S611). A detailed example of a method for determining whether or not a packet can be transmitted will be described later.

When the terminal device 200 determines that the report to the base station 100 is required (S611, YES), the terminal device 200 reports to the base station 100 that the subsequent packet transmission may fail (S613). On the other hand, when the terminal device 200 determines that the report to the base station 100 is unnecessary (S611, NO), the terminal device 200 does not make the above report.

As described above, with reference to FIGS. 33 and 34, an example of a series of processing flows of the terminal device 200 in the system according to the modified example has been described.

(Determining whether reporting to the base station is necessary)
Subsequently, the terminal device 200 determines whether or not subsequent packet transmission is possible based on the SPS setting at that time, and determines whether or not to report the result of the determination to the base station 100. An example will be described.

For example, the terminal device 200 may fail to transmit a subsequent packet depending on whether or not it is difficult to maintain the quality of service (QoS) of communication based on the SPS setting at that time. You may report to base station 100. As a more specific example, the terminal device 200 refers to the base station 100 when transmission failures occur m times (m is an integer of 1 or more) consecutively j times (j is an integer of 1 or more). The above report may be made. At this time, the variables m and j may be determined by the terminal device 200 itself or may be set by the base station 100. Further, the variables m and j may be set to common values for the plurality of terminal devices 200, or may be set individually for each of the plurality of terminal devices 200.

Further, as another example, the terminal device 200 may report to the base station 100 that the subsequent packet transmission may fail when the NACK is received for the packet transmission.

(Contents of the report from the terminal device to the base station)
Subsequently, an example of the content of the report when the terminal device 200 reports to the base station 100 that the subsequent packet transmission may fail will be described.

For example, when the terminal device 200 reports to the base station 100 that the subsequent packet transmission may fail, the terminal device 200 may include at least information on the reason why the transmission fails. As a specific example, the terminal device 200 reports to the base station 100 that it is difficult to satisfy the request for the transmission delay (latency) and that the resource for transmitting the packet is insufficient only with the SPS resource. You may.

In addition, the terminal device 200 may include information related to packet transmission in the report to the base station 100. As a specific example, the terminal device 200 may include information such as the number of times that QoS could not be maintained in the transmission of the packet so far in the report to the base station 100.

(Base station processing)
Subsequently, with reference to FIG. 35, an example of the processing flow of the base station 100 that has received the above report from the terminal device 200 will be described. FIG. 35 is a flowchart showing an example of a series of processing flows of the base station 100 in the system according to the modified example, and in particular, shows an example of the processing flow when the above report is received from the terminal device 200. ..

As shown in FIG. 35, when the base station 100 receives a report from the terminal device 200 that the subsequent packet transmission may fail (S651), the SPS is set according to the content of the report. (That is, whether or not to reconfigure the SPS) is determined (S653). As a specific example, if the base station 100 determines that it is difficult for the terminal device 200 that receives the report to maintain the QoS of communication, the base station 100 may determine that the SPS needs to be set again. good. As a more specific example, when the base station 100 receives a report from the terminal device 200 n times (n is an integer of 1 or more) or more, the base station 100 determines that it is difficult for the terminal device 200 to maintain the QoS of communication. However, it may be determined that the SPS needs to be set again. The variable n may be set to a common value for the plurality of terminal devices 200, or may be set individually for each of the plurality of terminal devices 200.

When the base station 100 decides to set the SPS again (S653, YES), the base station 100 reconfigures the SPS resource according to the content of the above report from the terminal device 200 (S655). At this time, the base station 100 may reconfigure the SPS resource according to the jitter component of the packet arrival cycle (that is, reserve the SPS resource) as in the above-mentioned example as “Proactive type resource allocation”. May be). Then, the base station 100 notifies the terminal device 200 of the information (SPS configuration) regarding the setting of the new SPS (S657). As a result, the terminal device 200 can specify the SPS resource to be used for packet transmission based on the new SPS setting at the subsequent packet transmission timing.

When the base station 100 determines that it is not necessary to set the SPS again (S653, NO), the base station 100 does not have to execute the processes indicated by the reference numerals S655 and S657.

As described above, a modified example of the system according to the present disclosure has been described with reference to FIGS. 33 to 35.

<< 5. Application example >>
Subsequently, an application example of the technique according to the present disclosure will be described. The technology according to the present disclosure can be applied to various products. For example, the base station 100 may be realized as any kind of eNB (evolved Node B) such as a macro eNB or a small eNB. The small eNB may be an eNB that covers cells smaller than the macro cell, such as a pico eNB, a micro eNB, or a home (femto) eNB. Instead, the base station 100 may be realized as another type of base station such as NodeB or BTS (Base Transceiver Station). The base station 100 may include a main body (also referred to as a base station device) that controls wireless communication, and one or more RRHs (Remote Radio Heads) that are arranged at a location different from the main body. Further, various types of terminals, which will be described later, may operate as the base station 100 by temporarily or semi-permanently executing the base station function.

Further, for example, the terminal device 200 is a smartphone, a tablet PC (Personal Computer), a notebook PC, a portable game terminal, a mobile terminal such as a portable / dongle type mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. It may be realized as. Further, the terminal device 200 may be realized as a terminal (also referred to as an MTC (Machine Type Communication) terminal) that performs M2M (Machine To Machine) communication. Further, the terminal device 200 may be a wireless communication module (for example, an integrated circuit module composed of one die) mounted on these terminals.

<5.1. Application examples related to base stations>
(First application example)
FIG. 36 is a block diagram showing a first example of a schematic configuration of an eNB to which the techniques according to the present disclosure can be applied. The eNB 800 has one or more antennas 810 and a base station device 820. Each antenna 810 and base station device 820 may be connected to each other via an RF cable.

Each of the antennas 810 has a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving a radio signal by the base station apparatus 820. The eNB 800 has a plurality of antennas 810 as shown in FIG. 36, and the plurality of antennas 810 may correspond to a plurality of frequency bands used by the eNB 800, for example. Although FIG. 36 shows an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.

The base station apparatus 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operates various functions of the upper layer of the base station apparatus 820. For example, the controller 821 generates a data packet from the data in the signal processed by the wireless communication interface 825, and transfers the generated packet via the network interface 823. The controller 821 may generate a bundled packet by bundling data from a plurality of baseband processors and transfer the generated bundled packet. Further, the controller 821 is a logic that executes control such as radio resource control (Radio Resource Control), radio bearer control (Radio Bearer Control), mobility management (Mobility Management), inflow control (Admission Control), or scheduling (Scheduling). Function. Further, the control may be executed in cooperation with the surrounding eNB or the core network node. The memory 822 includes a RAM and a ROM, and stores a program executed by the controller 821 and various control data (for example, terminal list, transmission power data, scheduling data, etc.).

The network interface 823 is a communication interface for connecting the base station apparatus 820 to the core network 824. Controller 821 may communicate with a core network node or other eNB via network interface 823. In that case, the eNB 800 and the core network node or other eNB may be connected to each other by a logical interface (for example, S1 interface or X2 interface). The network interface 823 may be a wired communication interface or a wireless communication interface for a wireless backhaul. When the network interface 823 is a wireless communication interface, the network interface 823 may use a frequency band higher than the frequency band used by the wireless communication interface 825 for wireless communication.

The wireless communication interface 825 supports either a cellular communication method such as LTE (Long Term Evolution) or LTE-Advanced, and provides a wireless connection to a terminal located in the cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may typically include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may perform, for example, coding / decoding, modulation / demodulation and multiplexing / demultiplexing, and may perform each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control) and PDCP. (Packet Data Convergence Protocol)) Performs various signal processing. The BB processor 826 may have some or all of the above-mentioned logical functions instead of the controller 821. The BB processor 826 may be a module including a memory for storing a communication control program, a processor for executing the program, and related circuits, and the function of the BB processor 826 may be changed by updating the above program. good. Further, the module may be a card or a blade inserted into the slot of the base station device 820, or may be a chip mounted on the card or the blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 810.

The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 36, and the plurality of BB processors 826 may correspond to a plurality of frequency bands used by, for example, the eNB 800. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 36, and the plurality of RF circuits 827 may correspond to, for example, a plurality of antenna elements. Although FIG. 36 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 includes a single BB processor 826 or a single RF circuit 827. It may be.

In the eNB 800 shown in FIG. 36, one or more components included in the base station 100 described with reference to FIG. 2 (for example, at least one of a communication control unit 151, an information acquisition unit 153, and a notification unit 155). May be implemented in the wireless communication interface 825. Alternatively, at least some of these components may be implemented in controller 821. As an example, the eNB 800 may include a module including a part (for example, a BB processor 826) or all of the wireless communication interface 825 and / or a controller 821, and the module may be equipped with one or more of the above components. good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, even if a program for making the processor function as one or more of the above components is installed in the eNB 800 and the wireless communication interface 825 (eg, BB processor 826) and / or the controller 821 executes the program. good. As described above, the eNB 800, the base station device 820, or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components is provided. You may. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the eNB 800 shown in FIG. 36, the wireless communication unit 120 described with reference to FIG. 2 may be mounted on the wireless communication interface 825 (for example, RF circuit 827). Further, the antenna unit 110 may be mounted on the antenna 810. Further, the network communication unit 130 may be implemented in the controller 821 and / or the network interface 823. Further, the storage unit 140 may be mounted in the memory 822.

(Second application example)
FIG. 37 is a block diagram showing a second example of a schematic configuration of an eNB to which the techniques according to the present disclosure can be applied. The eNB 830 has one or more antennas 840, a base station device 850, and an RRH860. Each antenna 840 and RRH860 may be connected to each other via an RF cable. Further, the base station apparatus 850 and RRH860 may be connected to each other by a high-speed line such as an optical fiber cable.

Each of the antennas 840 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the RRH860. The eNB 830 has a plurality of antennas 840 as shown in FIG. 37, and the plurality of antennas 840 may correspond to a plurality of frequency bands used by the eNB 830, for example. Although FIG. 37 shows an example in which the eNB 830 has a plurality of antennas 840, the eNB 830 may have a single antenna 840.

The base station apparatus 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, memory 852, and network interface 853 are similar to the controller 821, memory 822, and network interface 823 described with reference to FIG.

The wireless communication interface 855 supports either a cellular communication method such as LTE or LTE-Advanced, and provides a wireless connection to terminals located in the sector corresponding to the RRH860 via the RRH860 and the antenna 840. The wireless communication interface 855 may typically include a BB processor 856 and the like. The BB processor 856 is similar to the BB processor 826 described with reference to FIG. 36, except that it is connected to the RF circuit 864 of the RRH860 via the connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as shown in FIG. 37, and the plurality of BB processors 856 may correspond to a plurality of frequency bands used by, for example, the eNB 830. Although FIG. 37 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.

The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH860. The connection interface 857 may be a communication module for communication on the high-speed line that connects the base station apparatus 850 (wireless communication interface 855) and the RRH860.

The RRH860 also includes a connection interface 861 and a wireless communication interface 863.

The connection interface 861 is an interface for connecting the RRH860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on the high-speed line.

The wireless communication interface 863 transmits and receives wireless signals via the antenna 840. The wireless communication interface 863 may typically include RF circuits 864 and the like. The RF circuit 864 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 37, and the plurality of RF circuits 864 may correspond to, for example, a plurality of antenna elements. Although FIG. 37 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.

In the eNB 830 shown in FIG. 37, one or more components included in the base station 100 described with reference to FIG. 2 (for example, at least one of a communication control unit 151, an information acquisition unit 153, and a notification unit 155). May be implemented in wireless communication interface 855 and / or wireless communication interface 863. Alternatively, at least some of these components may be implemented in controller 851. As an example, the eNB 830 includes a module including a part (for example, BB processor 856) or all of the wireless communication interface 855 and / or a controller 851, and even if one or more of the above components are implemented in the module. good. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, even if a program for making the processor function as one or more of the above components is installed in the eNB 830 and the wireless communication interface 855 (eg, BB processor 856) and / or the controller 851 executes the program. good. As described above, the eNB 830, the base station device 850, or the module may be provided as a device including the one or more components, and a program for making the processor function as the one or more components is provided. You may. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the eNB 830 shown in FIG. 37, for example, the wireless communication unit 120 described with reference to FIG. 2 may be mounted on the wireless communication interface 863 (for example, RF circuit 864). Further, the antenna unit 110 may be mounted on the antenna 840. Further, the network communication unit 130 may be implemented in the controller 851 and / or the network interface 853. Further, the storage unit 140 may be mounted in the memory 852.

<5.2. Application examples related to terminal devices>
(First application example)
FIG. 38 is a block diagram showing an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, and one or more antenna switches 915. It comprises one or more antennas 916, bus 917, battery 918 and auxiliary controller 919.

The processor 901 may be, for example, a CPU or a SoC (System on Chip), and controls the functions of the application layer and other layers of the smartphone 900. Memory 902 includes RAM and ROM and stores programs and data executed by processor 901. The storage 903 may include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.

The camera 906 has an image pickup device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates an captured image. The sensor 907 may include, for example, a group of sensors such as a positioning sensor, a gyro sensor, a geomagnetic sensor and an acceleration sensor. The microphone 908 converts the voice input to the smartphone 900 into a voice signal. The input device 909 includes, for example, a touch sensor, a keypad, a keyboard, a button, or a switch for detecting a touch on the screen of the display device 910, and receives an operation or information input from the user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays an output image of the smartphone 900. The speaker 911 converts the voice signal output from the smartphone 900 into voice.

The wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may perform, for example, coding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and performs various signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 916. The wireless communication interface 912 may be a one-chip module in which a BB processor 913 and an RF circuit 914 are integrated. The wireless communication interface 912 may include a plurality of BB processors 913 and a plurality of RF circuits 914 as shown in FIG. 38. Although FIG. 38 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 includes a single BB processor 913 or a single RF circuit 914. It may be.

Further, the wireless communication interface 912 may support other types of wireless communication systems such as a short-range wireless communication system, a near field wireless communication system, or a wireless LAN (Local Area Network) system, in addition to the cellular communication system. In that case, the BB processor 913 and the RF circuit 914 for each wireless communication system may be included.

Each of the antenna switches 915 switches the connection destination of the antenna 916 between a plurality of circuits included in the wireless communication interface 912 (for example, circuits for different wireless communication methods).

Each of the antennas 916 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the wireless communication interface 912. The smartphone 900 may have a plurality of antennas 916 as shown in FIG. 38. Although FIG. 38 shows an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.

Further, the smartphone 900 may be provided with an antenna 916 for each wireless communication method. In that case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.

The bus 917 connects the processor 901, the memory 902, the storage 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919 to each other. .. The battery 918 supplies electric power to each block of the smartphone 900 shown in FIG. 38 via a power supply line partially shown by a broken line in the figure. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900, for example, in the sleep mode.

In the smartphone 900 shown in FIG. 38, one or more components (for example, communication control unit 241, information acquisition unit 243, determination unit 245, and notification unit 247) included in the terminal device 200 described with reference to FIG. At least one of) may be implemented in the wireless communication interface 912. Alternatively, at least some of these components may be implemented in processor 901 or auxiliary controller 919. As an example, the smartphone 900 includes a module including a part (for example, BB processor 913) or all of the wireless communication interface 912, a processor 901, and / or an auxiliary controller 919, and one or more of the above-mentioned components in the module. May be implemented. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, a program for making the processor function as one or more of the above components is installed in the smartphone 900, the wireless communication interface 912 (eg, BB processor 913), the processor 901, and / or the auxiliary controller 919. You may run the program. As described above, the smartphone 900 or the module may be provided as a device including the one or more components, or a program for making the processor function as the one or more components may be provided. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the smartphone 900 shown in FIG. 38, for example, the wireless communication unit 220 described with reference to FIG. 3 may be mounted on the wireless communication interface 912 (for example, RF circuit 914). Further, the antenna unit 210 may be mounted on the antenna 916. Further, the storage unit 230 may be mounted in the memory 902.

(Second application example)
FIG. 39 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technique according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. It comprises an interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

The processor 921 may be, for example, a CPU or SoC, and controls the navigation function and other functions of the car navigation device 920. Memory 922 includes RAM and ROM and stores programs and data executed by processor 921.

The GPS module 924 uses GPS signals received from GPS satellites to measure the position (eg, latitude, longitude and altitude) of the car navigation device 920. The sensor 925 may include, for example, a group of sensors such as a gyro sensor, a geomagnetic sensor and a barometric pressure sensor. The data interface 926 is connected to the vehicle-mounted network 941 via a terminal (not shown), and acquires data generated on the vehicle side such as vehicle speed data.

The content player 927 reproduces the content stored in the storage medium (for example, a CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, or a switch that detects a touch on the screen of the display device 930, and accepts an operation or information input from the user. The display device 930 has a screen such as an LCD or an OLED display, and displays an image of a navigation function or a content to be reproduced. The speaker 931 outputs the sound of the navigation function or the content to be played.

The wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may perform, for example, coding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and performs various signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmits and receives radio signals via the antenna 937. The wireless communication interface 933 may be a one-chip module in which a BB processor 934 and an RF circuit 935 are integrated. The wireless communication interface 933 may include a plurality of BB processors 934 and a plurality of RF circuits 935 as shown in FIG. Although FIG. 39 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 includes a single BB processor 934 or a single RF circuit 935. It may be.

Further, the wireless communication interface 933 may support other types of wireless communication systems such as a short-range wireless communication system, a near field wireless communication system, or a wireless LAN system in addition to the cellular communication system. A BB processor 934 and an RF circuit 935 for each communication method may be included.

Each of the antenna switches 936 switches the connection destination of the antenna 937 between a plurality of circuits included in the wireless communication interface 933 (for example, circuits for different wireless communication methods).

Each of the antennas 937 has a single or multiple antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna) and is used for transmitting and receiving radio signals by the wireless communication interface 933. The car navigation device 920 may have a plurality of antennas 937 as shown in FIG. 39. Although FIG. 39 shows an example in which the car navigation device 920 has a plurality of antennas 937, the car navigation device 920 may have a single antenna 937.

Further, the car navigation device 920 may be provided with an antenna 937 for each wireless communication system. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.

The battery 938 supplies electric power to each block of the car navigation device 920 shown in FIG. 39 via a power supply line partially shown by a broken line in the figure. In addition, the battery 938 stores electric power supplied from the vehicle side.

In the car navigation device 920 shown in FIG. 39, one or more components (for example, communication control unit 241 and information acquisition unit) included in the terminal device 200 described with reference to FIG. 3 described with reference to FIG. At least one of 243, determination unit 245, and notification unit 247) may be implemented in the wireless communication interface 933. Alternatively, at least some of these components may be implemented in processor 921. As an example, the car navigation device 920 includes a module including a part (for example, BB processor 934) or all and / or a processor 921 of the wireless communication interface 933, in which one or more of the above components are mounted. You may. In this case, the module stores a program for causing the processor to function as the one or more components (in other words, a program for causing the processor to execute the operation of the one or more components). You may run the program. As another example, a program for making the processor function as one or more of the above components is installed in the car navigation device 920, and the wireless communication interface 933 (eg, BB processor 934) and / or the processor 921 executes the program. You may. As described above, the car navigation device 920 or the module may be provided as a device including the one or more components, or a program for making the processor function as the one or more components may be provided. good. Further, a readable recording medium on which the above program is recorded may be provided.

Further, in the car navigation device 920 shown in FIG. 39, for example, the wireless communication unit 220 described with reference to FIG. 3 may be mounted on the wireless communication interface 933 (for example, RF circuit 935). Further, the antenna unit 210 may be mounted on the antenna 937. Further, the storage unit 230 may be mounted in the memory 922.

Further, the technique according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 including one or more blocks of the car navigation device 920 described above, an in-vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the vehicle-mounted network 941.

<< 6. Conclusion >>
As described above, in the system according to the embodiment of the present disclosure, the terminal device notifies the base station of the first information regarding the conditions for periodically transmitting the packet to the other terminal device by the inter-device communication. do. The first information includes, for example, at least one of information on jitter of a packet periodically transmitted by inter-device communication and information on size variation of the packet. Further, after the notification of the first information, the terminal device acquires the second information regarding the transmission resource available for transmission of the periodic packet from the base station. Then, the terminal device selects a resource to be used for transmitting the periodic packet based on the second information.

With the above configuration, the base station is more flexible even in a situation where, for example, the transmission timing of the packet varies according to the jitter component contained in the traffic, the size of the transmitted packet varies, and the like. Resources can be allocated to. That is, according to the system according to the embodiment of the present disclosure, more flexible resource allocation becomes possible in inter-device communication such as V2X communication. Of the plurality of terminal devices that perform inter-device communication, some terminal devices correspond to an example of the "first terminal device", and some other terminal devices correspond to an example of the "second terminal device". Equivalent to.

Further, in the system according to the embodiment of the present disclosure, the terminal device responds to the information regarding the first resource allocated to be used for transmitting the packet in the inter-device communication and the information regarding the packet to be transmitted. Therefore, the base station is notified of the request regarding the allocation of the second resource different from the first resource.

With the above configuration, the terminal device can respond to the above request even when it is difficult to transmit a packet using, for example, a pre-allocated (reserved) first resource. It is also possible to transmit the packet by using the second resource newly allocated by. That is, even in a situation where the transmission timing of the packet varies according to the jitter component contained in the traffic, the size of the transmitted packet fluctuates, and the like, the terminal device supplies resources to the base station depending on the situation. By requesting allocation, it is possible to send packets in a stable manner.

Further, in the system according to the embodiment of the present disclosure, the terminal device includes information on a first resource allocated to be used for transmitting a packet in inter-device communication, and information on the packet to be transmitted. A second resource different from the first resource is selected accordingly.

With the above configuration, the terminal device can transmit the packet by using the pre-allocated (reserved) first resource, for example, even when it is difficult to transmit the packet. It is also possible to send the packet by using the resource. That is, even in a situation where the transmission timing of the packet varies according to the jitter component contained in the traffic, the size of the transmitted packet fluctuates, and the like, the terminal device newly selects a resource according to the situation. By doing so, it becomes possible to transmit packets in a stable manner.

In particular, in NR V2X communication, it supports new use cases that require high reliability, low delay, high-speed communication, and high capacity, which cannot be supported by LTE-based V2X. Even in such a case, according to the system according to the embodiment of the present disclosure, it is possible to more flexibly deal with each of various use cases supported by NR V2X communication based on the above-described configuration. It will be possible.

Although the preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. It is clear that a person having ordinary knowledge in the technical field of the present disclosure can come up with various modifications or modifications within the scope of the technical ideas described in the claims. Of course, it is understood that the above also belongs to the technical scope of the present disclosure.

In addition, the effects described herein are merely explanatory or exemplary and are not limited. That is, the techniques according to the present disclosure may exhibit other effects apparent to those skilled in the art from the description herein, in addition to or in place of the above effects.

The following configurations also belong to the technical scope of the present disclosure.
(1)
With the communication unit that performs wireless communication,
A notification unit that notifies the base station of the first information regarding the conditions for periodically transmitting a packet to another terminal device by inter-device communication, and a notification unit.
After the notification of the first information, an acquisition unit that acquires the second information about the transmission resource available for transmission of the periodic packet from the base station, and the acquisition unit.
Based on the second information, a control unit that selects a resource to be used for transmitting the periodic packet, and a control unit.
A communication device.
(2)
The communication according to (1) above, wherein the first information includes at least one of information on jitter of a packet periodically transmitted by the inter-device communication and information on size variation of the packet. Device.
(3)
The communication device according to (1) or (2), wherein the range in which the resource is selected is determined based on the first information and the conditions for communication between devices.
(4)
The conditions for inter-device communication are as follows:
The degree of congestion in the frequency band used for inter-device communication and
The priority of packets transmitted via the inter-device communication and
The type of service for which inter-device communication is used and
The type of packet transmitted via the inter-device communication and
The location information of the terminal device that uses the inter-device communication and
The speed of the terminal device that uses the inter-device communication and
Including at least one of the conditions,
The communication device according to (3) above.
(5)
The control unit selects a resource to be used for transmitting the periodic packet based on the second information and a condition for selecting the resource, any one of the above (1) to (4). The communication device described in the section.
(6)
The communication device according to (5) above, wherein the conditions for selecting the resource are notified from the base station.
(7)
The conditions for selecting the resource are
Random resource selection conditions and
Conditions for resource selection based on sensing and
Conditions related to resource selection according to the timing at which the generated packet can be sent, and
Conditions for selecting resources according to the level associated with each resource, and
Including at least one of the conditions,
The communication device according to (5) or (6) above.
(8)
The level is set according to at least one of a probability density function of a jitter component in the periodic packet transmission and a probability density function of a component of the size variation of the packet (7). The communication device described in.
(9)
With the communication unit that performs wireless communication,
The first resource, depending on the information about the first resource allocated for use in transmitting periodic packets to other terminal devices by inter-device communication and the information about the packet to be transmitted. A control unit that acquires a second resource different from
A communication device.
(10)
The communication device according to (9) above, wherein the control unit acquires the second resource by requesting the base station to allocate the second resource.
(11)
The first resource is a resource that is available for transmission of a periodic packet to another terminal device by the device-to-device communication.
The allocation of the first resource is controlled according to the allocation result of the second resource based on the request.
The communication device according to (10) above.
(12)
The communication device according to (9) above, wherein the control unit acquires the second resource by selecting the second resource.
(13)
The communication device according to (12) above, wherein the control unit randomly selects the second resource.
(14)
The communication device according to (12) above, wherein the control unit selects the second resource according to the sensing result of the resource available for the communication between the devices.
(15)
The communication device according to (12), wherein the control unit selects the second resource according to the timing at which the generated packet can be transmitted.
(16)
The communication device according to (15), wherein the control unit selects the second resource capable of transmitting the generated packet in the shortest time.
(17)
The communication device according to any one of (12) to (16), wherein the control unit selects the second resource from the resource pool allocated to be used for inter-device communication by the base station. ..
(18)
The communication device according to (17) above, wherein at least a part of the resources in the resource pool is allocated in common with one or more other terminal devices.
(19)
The communication device according to (17) above, wherein at least a part of the resources in the resource pool is allocated separately from other terminal devices.
(20)
The communication according to any one of (12) to (19), wherein the control unit selects the second resource according to the usage status of the resource for the inter-device communication by another terminal device. Device.
(21)
The communication device according to (20) above, wherein the information regarding the usage status of resources for communication between the devices by the other terminal device is notified from the base station.
(22)
The communication device according to (20) above, wherein information on the usage status of resources for communication between the devices by the other terminal device is notified from the other terminal device.
(23)
The other terminal device for which information on the resource usage status for inter-device communication is to be acquired is
The attributes of packets sent by the other terminal device and
The degree of interference with the other terminal device and
Determined according to at least one of
The communication device according to any one of (20) to (22).
(24)
A determination unit that determines whether or not a periodic packet can be sent using the first resource, and a determination unit.
A notification unit that notifies the base station of the result of the determination,
With
In response to the notification, the allocation of the first resource is controlled.
The communication device according to any one of (12) to (23).
(25)
With the communication unit that performs wireless communication,
An acquisition unit that acquires first information regarding conditions for the first terminal device to periodically transmit a packet to the second terminal device by inter-device communication from the first terminal device.
A control unit that controls the allocation of resources available for transmitting the periodic packet based on the first information.
A notification unit that notifies the first terminal device of second information regarding allocation of resources available for transmitting the periodic packet, and a notification unit.
A communication device.
(26)
The computer
To perform wireless communication and
Notifying the base station of the first information regarding the conditions for periodically transmitting packets to other terminal devices by inter-device communication, and
After the notification of the first information, obtaining the second information about the transmission resource available for transmission of the periodic packet from the base station, and
Based on the second information, selecting the resource to be used for transmitting the periodic packet and
Communication methods, including.
(27)
The computer
To perform wireless communication and
The first resource, depending on the information about the first resource allocated for use in transmitting periodic packets to other terminal devices by inter-device communication and the information about the packet to be transmitted. To get a second resource that is different from
Communication methods, including.
(28)
The computer
To perform wireless communication and
Acquiring the first information regarding the conditions for the first terminal device to periodically transmit a packet to the second terminal device by inter-device communication from the first terminal device, and
Controlling the allocation of resources available for the periodic packet transmission based on the first information.
Notifying the first terminal device of second information regarding the allocation of resources available for transmitting the periodic packet, and
Communication methods, including.

1 System 100 Base station 110 Antenna unit 120 Wireless communication unit 130 Network communication unit 140 Storage unit 150 Control unit 151 Communication control unit 153 Information acquisition unit 155 Notification unit 200 Terminal device 210 Antenna unit 220 Wireless communication unit 230 Storage unit 240 Control unit 241 Communication control unit 243 Information acquisition unit 245 Judgment unit 247 Notification unit

Claims (24)

With the communication unit that performs wireless communication,
A notification unit that notifies the base station of the first information regarding the conditions for periodically transmitting a packet to another terminal device by inter-device communication, and a notification unit.
After the notification of the first information, an acquisition unit that acquires the second information about the transmission resource available for transmission of the periodic packet from the base station, and the acquisition unit.
Based on the second information, a control unit that selects a resource to be used for transmitting the periodic packet, and a control unit.
A communication device. The communication device according to claim 1, wherein the first information includes at least one of information on jitter of a packet periodically transmitted by the device-to-device communication and information on size variation of the packet. .. The communication device according to claim 1, wherein the range in which the resource is selected is determined based on the first information and the conditions for communication between devices. The conditions for inter-device communication are as follows:
The degree of congestion in the frequency band used for inter-device communication and
The priority of packets transmitted via the inter-device communication and
The type of service for which inter-device communication is used and
The type of packet transmitted via the inter-device communication and
The location information of the terminal device that uses the inter-device communication and
The speed of the terminal device that uses the inter-device communication and
Including at least one of the conditions,
The communication device according to claim 3. The communication device according to claim 1, wherein the control unit selects a resource to be used for transmitting the periodic packet based on the second information and a condition for selecting a resource. The communication device according to claim 5, wherein the conditions for selecting the resource are notified from the base station. The conditions for selecting the resource are
Random resource selection conditions and
Conditions for resource selection based on sensing and
Conditions related to resource selection according to the timing at which the generated packet can be sent, and
Conditions for selecting resources according to the level associated with each resource, and
Including at least one of the conditions,
The communication device according to claim 5. The level is set according to at least one of a probability density function of a jitter component in the periodic packet transmission and a probability density function of a component of the size variation of the packet, according to claim 7. The communication device described. With the communication unit that performs wireless communication,
The first resource, depending on the information about the first resource allocated for use in transmitting periodic packets to other terminal devices by inter-device communication and the information about the packet to be transmitted. A control unit that acquires a second resource different from
A communication device. The communication device according to claim 9, wherein the control unit acquires the second resource by requesting the base station to allocate the second resource. The first resource is a resource that is available for transmission of a periodic packet to another terminal device by the device-to-device communication.
The allocation of the first resource is controlled according to the allocation result of the second resource based on the request.
The communication device according to claim 10. The communication device according to claim 9, wherein the control unit acquires the second resource by selecting the second resource. The communication device according to claim 12, wherein the control unit randomly selects the second resource. The communication device according to claim 12, wherein the control unit selects the second resource according to the sensing result of the resource available for the communication between the devices. The communication device according to claim 12, wherein the control unit selects the second resource according to the timing at which the generated packet can be transmitted. The communication device according to claim 15, wherein the control unit selects the second resource capable of transmitting the generated packet in the shortest time. The communication device according to claim 12, wherein the control unit selects the second resource from a resource pool that is available for communication between the devices by the base station. The communication device according to claim 17, wherein at least a part of the resources in the resource pool is allocated in common with one or more other terminal devices. The communication device according to claim 17, wherein at least a part of the resources in the resource pool is allocated separately from other terminal devices. The communication device according to claim 12, wherein the control unit selects the second resource according to the usage status of the resource for the communication between the devices by another terminal device. The communication device according to claim 20, wherein information regarding the usage status of resources for communication between the devices by the other terminal device is notified from the base station. The communication device according to claim 20, wherein information on the usage status of resources for communication between the devices by the other terminal device is notified from the other terminal device. The other terminal device for which information on the resource usage status for inter-device communication is to be acquired is
The attributes of packets sent by the other terminal device and
The degree of interference with the other terminal device and
Determined according to at least one of
The communication device according to claim 20. A determination unit that determines whether or not a periodic packet can be sent using the first resource, and a determination unit.
A notification unit that notifies the base station of the result of the determination,
With
In response to the notification, the allocation of the first resource is controlled.
The communication device according to claim 12.

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