CN113748741B - User terminal and wireless communication method - Google Patents
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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Abstract
The user terminal has: a transmission unit that performs 1 st signal transmission using setting information including at least one of transmission power and a spatial domain transmission filter; and a control unit that uses one candidate among a plurality of candidates of the setting information for transmission of the 2 nd signal, the one candidate being a candidate based on at least one of a reception result of the 1 st signal transmission notified by at least one apparatus and a reception result of signal transmission from the at least one apparatus. According to one embodiment of the present disclosure, resource utilization efficiency can be improved.
Description
Technical Field
The present disclosure relates to a user terminal and a wireless communication method in a next generation mobile communication system.
Background
In a universal mobile telecommunications system (Universal Mobile Telecommunications System (UMTS)) network, long term evolution (Long Term Evolution (LTE)) is standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further large capacity, high altitude, and the like of LTE (third generation partnership project (Third Generation Partnership Project (3 GPP)) Release (rel.)) versions 8 and 9, LTE-Advanced (3 GPP rel.10-14) has been standardized.
Subsequent systems of LTE (e.g., also referred to as fifth generation mobile communication system (5 th generation mobile communication system (5G)), 5g+ (plus), new Radio (NR)), 3gpp rel.15 later, and the like are also being studied
In a conventional LTE system (e.g., LTE rel.8-14), a User Equipment (UE)) controls reception of a downlink shared channel (e.g., physical Downlink SHARED CHANNEL (PDSCH, physical downlink shared channel)) based on downlink control information (Downlink Control Information (DCI), also referred to as DL allocation (downlink assignment, downlink allocation), etc.) transmitted via a downlink control channel (e.g., physical Downlink Control Channel (PDCCH, physical downlink control channel)). The user terminal controls transmission of an Uplink shared channel (e.g., physical Uplink SHARED CHANNEL (PUSCH) based on DCI (also referred to as UL grant or the like).
Prior art literature
Non-patent literature
Non-patent document 1：3GPP TS 36.300 V8.12.0"Evolved Universal Terrestrial Radio Access(E-UTRA)and Evolved Universal Terrestrial Radio Access Network(E-UTRAN);Overall description;Stage 2(Release 8)",2010, month 4
Disclosure of Invention
Problems to be solved by the invention
In future wireless communication systems, if a conventional self-dispersion multiplexing access scheme is applied, overhead such as carrier sense is large, and there is a risk of system performance degradation such as a reduction in communication throughput and a reduction in resource utilization efficiency.
It is, therefore, one of the objects of the present disclosure to provide a user terminal and a wireless communication method that improve resource utilization efficiency.
Means for solving the problems
The user terminal according to one aspect of the present disclosure includes: a transmission unit that performs 1 st signal transmission using setting information including at least one of transmission power and a spatial domain transmission filter; and a control unit that uses one candidate among a plurality of candidates of the setting information for transmission of the 2 nd signal, the one candidate being a candidate based on at least one of a reception result of the 1 st signal transmission notified by at least one device and a reception result of a signal transmission from the at least one device.
ADVANTAGEOUS EFFECTS OF INVENTION
According to one embodiment of the present disclosure, resource utilization efficiency can be improved.
Drawings
Fig. 1 is a diagram showing an example of a CDM reservation signal.
Fig. 2 is a diagram showing an example of a CDM reservation signal and response signal.
Fig. 3 is a diagram showing an example of reservation of a specific signal using bidding information.
Fig. 4 is a diagram showing an example of free resources during a specific signal period.
Fig. 5 is a diagram showing an example of the use of free resources during a specific signal period.
Fig. 6 is a diagram illustrating an example of a case where a plurality of UEs share a reservation signal time zone.
Fig. 7 is a diagram illustrating an example of distances between a plurality of UEs.
Fig. 8 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.
Fig. 9 is a diagram showing an example of a configuration of a base station according to an embodiment.
Fig. 10 is a diagram showing an example of a configuration of a user terminal according to an embodiment.
Fig. 11 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment.
Detailed Description
Multiplexing access mode of self-dispersion type
In future wireless communication systems, in order to improve the efficiency of radio resource utilization, there is a possibility that local scheduling, a distributed access scheme (self-distributed multiplexing access scheme), and transmission and reception of broadcast (broadcast) signals between UEs are assumed.
As a self-dispersion multiplexing Access scheme, for example, in a wireless local area network (LAN, local area network) system, CARRIER SENSE Multiple Access (CSMA) and/or Collision Avoidance (CA) are used for collision avoidance and/or interference control. In CSMA/CA, a specific time (Distributed ACCESS INTER FRAME SPACE (DIFS) is set before transmission, and a transmitting apparatus performs data transmission after confirming that no other transmission signal (carrier sense, listen before talk (LBT, listen before talk)) exists in the DIFS. After the data transmission, the reception apparatus waits for ACKnowledgement (ACK). If the transmitting apparatus cannot receive the ACK within a specific time, it determines that a collision has occurred and retransmits the ACK. It is assumed that the transmitting apparatus detects other transmission signals before transmission, and thereafter starts data transmission if no other transmission signals are detected through DIFS and a backoff period (e.g., random backoff).
In addition, carrier sensing (CARRIER SENSE), LBT, sensing (listening), CLEAR CHANNEL ASSESSMENT (CCA, clear channel assessment), sensing of channels, or channel access operation (CHANNEL ACCESS procedure) may also be substituted for each other.
The node using the self-dispersed multiplexing access scheme can transmit data without scheduling data transmission through a network (NW, for example, a base station).
However, CSMA/CA has a large overhead such as carrier sense, and thus has problems such as a low communication throughput and a low resource utilization efficiency.
Therefore, it is considered that a plurality of UEs scattered are broadcasted to each other using different sequences (e.g., quasi-orthogonal sequences) in the same time resource and frequency resource (code division multiplexing (code division multiplex (CDM)) of signals from the plurality of UEs). In this case, in order to improve the signal separation system and optimize the reception quality, it is desirable to equalize the reception power at the reception points of these UEs.
However, since the distance and the positional relationship between UEs are not constant, it is difficult to actually equalize the received power, particularly when the number of UEs is 3 or more.
Accordingly, the present inventors focused on a method of controlling transmission of each UE.
Embodiments according to the present disclosure will be described in detail below with reference to the drawings. The radio communication methods according to the embodiments may be applied alone or in combination.
In the present disclosure, nodes, UEs, base stations, wireless communication devices, apparatuses, devices, carriers (vechicles) may also be substituted for each other.
In the present disclosure, the 2 nd signal transmission, the 2 nd signal, the specific (specific) signal, the object signal, the data, the UL signal, PUSCH, PUCCH, sounding REFERENCE SIGNAL (SRS), demodulation REFERENCE SIGNAL (DMRS, demodulation reference signal), and the side link signal (for example, PHYSICAL SIDELINK SHARED CHANNEL (PSSCH), PHYSICAL SIDELINK Control Channel (PSCCH) may also be replaced with each other.
In the present disclosure, the 1 st signal transmission, the 1 st signal, the 2 nd signal transmission, the 2 nd signal, the reservation, the assurance, the allocation, the bidding, the acquisition, the control, the advance transmission, the reference signal transmission, the reservation signal transmission, the advance signal, the reservation signal, the allocation signal, the bidding signal, the control signal, the access signal, the random access signal, the reference signal, PUSCH, PUSCH, SRS, DMRS, the side link signal (e.g., PSSCH, PSCCH), the measurement signal, the distance measurement signal, the power measurement signal, the estimation signal, and the measurement RS may also be replaced with each other.
In the present disclosure, signals, information, preambles, channels, RSs may also be replaced with each other.
In the present disclosure, the specific signal transmission, the specific signal, the specific kind of signal, the controlled signal, the 2 nd signal transmission, and the 2 nd signal may be replaced with each other.
In the present disclosure, transmission beams, spatial relationship (spatial relationship), spatial relationship information, spatial relationship assumption, spatial domain transmission filter, UE spatial domain transmission filter, spatial domain filter, UE transmission beam, UL transmission beam, analog beam, precoding, RS related to QCL parameters, RS of QCL type D, and the like may be replaced.
(Wireless communication method)
Embodiment 1 >
A node in the wireless communication system may transmit a reservation signal in a 1 st period (for example, a reservation signal period or a reservation signal time period) and transmit a specific signal in a2 nd period (for example, a specific signal period or a specific signal time period). The reservation signal may be a signal for reserving a resource of a specific signal to be used later, or may be a signal transmitted (transmitted in advance) prior to the specific signal.
The time resources for transmitting the reservation signal may also be configured (set, inserted, mapped) before the time resources for transmitting the specific signal. The time resource for transmitting the reservation signal may be a reservation signal time interval, symbol, mini slot, subframe, transmission opportunity, or the like. The time resources for transmitting the specific signal may also be specific signal time intervals, symbols, mini-slots, subframes, transmission opportunities, etc.
The reservation signal period including 1 or more reservation signal time periods may be arranged at periodic time intervals. In the periodic time interval, a specific signal period including 1 or more specific signal time intervals may be configured. The reservation signal period may also be configured before the specific signal period. The time interval may also be any of a frame, a subframe, a slot, a mini-slot.
The reservation signal period may be configured in a certain time interval, and the specific signal period may be set in the same time interval. The reservation signal period may be configured in a certain time interval, and the specific signal period may be configured in another time interval.
The reservation signal may also be transmitted in 1 symbol and a specific bandwidth. The specific bandwidth may be specified by a standard or may be set by high-level signaling. The specific bandwidth may be 1 Resource Block (RB), bandwidth part (BWP), or other bandwidths.
The node may also transmit a reservation signal using the same subcarrier spacing (subcarrier spacing (SCS)) as the specific signal. The node may also transmit the reservation signal using a different SCS than the SCS of the specific signal. The SCS of the reservation signal may also be higher than the SCS of the specific signal.
The information on at least one of the SCS during the reservation signal, the SCS during the specific signal, and the ratio of the SCS during the reservation signal to the SCS during the specific signal (e.g., the ratio of the SCS during the reservation signal to the SCS during the specific signal) may be predetermined by a standard or may be set by a notification (e.g., higher layer signaling) from the network (NW, e.g., base station).
The minimum time required to switch from the SCS of the reservation signal to the SCS of the specific signal may also be specified by the standard. The node may also not signal in SCS handover.
For example, the SCS during the reserved signal period may also be higher than the SCS during the specific signal period. That is, the symbol length of the reserved signal period may be shorter than the symbol length of the specific signal period. A gap (transmission disabled period) may be provided between the reserved signal period and the specific signal period. The duration of the gap may be longer than the time required for the SCS to switch.
Since the SCS of the reservation signal is higher than the SCS of the specific signal, the overhead of the reservation signal can be suppressed, the reservation signal time zone and the reservation signal period can be shortened, and the utilization efficiency of resources can be improved.
A gap may be set between the reserved signal period and the specific signal period. The time length of the gap may be equal to or longer than a time required for processing from reception of a reservation signal from another node to transmission of a specific signal.
A gap may also be provided between the reservation signal time intervals. The time length of the gap may be equal to or longer than a time required for processing from reception of a reservation signal from another node to transmission of a specific signal from the own node.
The reservation signal may also be transmitted by at least one UE, and the specific signal may be transmitted by at least one UE. The reservation signal may be a broadcast signal or a multicast signal for a group of UEs. The specific signal may be data to a base station, UL signal, PUSCH, or the like.
Each of the plurality of nodes may also be a UE.
According to embodiment 1 above, the specific signal is not scheduled by the NW, and the reservation signal is transmitted by each node, so that reservation of the specific signal is possible.
Embodiment 2 >
The node that wants to transmit the specific signal in the specific signal time interval may determine the reservation signal time interval and transmit the reservation signal in the determined reservation signal time interval.
The UE that transmitted the reservation signal in the reservation signal time interval may transmit the specific signal in the specific signal time interval under the specific condition. The node having the highest priority among the nodes that transmitted the reservation signal in the reservation signal period may transmit the specific signal in the specific signal period. The reservation signal time interval may also be associated with a node or priority of a node.
The reservation signal may be an orthogonal sequence or a quasi-orthogonal sequence. The reservation signal may be low Peak to Average Power Ratio (low PAPR, low peak to average power ratio) sequences (Constant Amplitude Zero Auto Correlation (CAZAC, constant amplitude zero auto correlation) sequences, sequences according to CAZAC sequences, e.g., zadoff-Chu sequences, computer-generated sequences specified by standards (tables), etc.), or quasi-Random (Pseudo-Random) sequences (quasi-Noise (PN)) sequences, e.g., gold sequences, M sequences.
The reservation signal may indicate at least one of information (at least one of time resource, frequency resource, space resource, and code resource) of a resource of the specific signal and information of a transmission destination of the specific signal. The reservation signal may also be control information (e.g., side link control information (sidelink control information (SCI)) transmitted from the UE to another UE.
The node may receive the signal in at least one of a reservation signal time zone preceding the reservation signal time zone of the node and a reservation signal time zone following the reservation signal time zone of the node.
Each node may be set with a plurality of bands. The nodes may use different bands in the order of priority of the reservation signals to be transmitted.
When the node determines the priority of the received reservation signal based on the priority rule, and receives the reservation signal from the node having a higher priority than the priority of the node itself, and the resources indicated by the reservation signal include at least a part of the resources for transmitting the predetermined specific signal itself, the node may terminate transmission of the specific signal, select a band in the order of the priority of the transmitted reservation signal, and transmit the specific signal in the selected band.
When the node determines the priority of the received reservation signal based on the priority rule, and receives the reservation signal from the node having a higher priority than the priority of the node itself, and the destination indicated by the reservation signal is the node itself, the node may terminate transmission of the specific signal, select a band in the order of the priority of the transmitted reservation signals, and transmit the specific signal in the selected band.
The priority rule may be such that the priority is higher as the reservation signal time zone in which the reservation signal is transmitted in the reservation signal period is earlier, or the priority is higher as the reservation signal time zone in which the reservation signal is transmitted in the reservation signal period is later.
According to embodiment 2 above, even when a plurality of nodes transmit a reservation signal in a reservation signal period, a priority node can transmit a specific signal in a specific signal period appropriately.
Embodiment 3 >
A node that wants to transmit a specific signal in a specific signal time interval may also transmit a reservation signal in a common reservation signal time interval. The UE that transmitted the reservation signal in the reservation signal time interval may transmit the specific signal in the specific signal time interval under the specific condition.
In the 1 reservation signal time interval, a plurality of nodes may transmit reservation signals. When the reservation signal time interval is a symbol, a plurality of nodes may transmit the reservation signal in 1 symbol.
The reservation signals from the plurality of nodes may also be code division multiplexed (code division multiplex (CDM)) in the same reservation signal time interval and in the same band domain.
In the 1-reservation-signal time interval, a plurality of nodes may transmit reservation signals based on different sequences.
Compared with the case where the reservation signal time interval is associated with a node, the reservation signal period can be shortened, and overhead can be reduced.
The sequence for the reservation signal may also be associated with a sequence index. The sequence index may be based on at least one of a base sequence (base sequence) index and a cyclic shift (CYCLIC SHIFT) index used in the sequence for the reservation signal.
The node may determine whether to transmit a specific signal according to the reception result and the priority rule of the signal during the reservation signal (for example, the same as at least one of the reservation signal generation methods 1 and 2 described above).
The sequence may also be associated with at least one of a priority and a node. The priority rule may be higher as the sequence index is smaller, or higher as the sequence index is larger.
A node that transmits a reservation signal in a certain reservation signal time interval may identify a reservation signal from another node in the reservation signal time interval.
The node may also identify reservation signals from other nodes according to at least one of the next other node signal identification methods 1, 2.
Method 1 for identifying other node signals
Nodes may also support full duplex (full duplex) communications (simultaneous transmissions and receptions in the same time and frequency resources). The node may transmit the reservation signal and receive the reservation signal from another node at the same time in the same frequency (for example, at least one Resource Block (RB)). The node may transmit the reservation signal and receive the reservation signal from another node at different frequencies (e.g., at least one Resource Block (RB)).
For example, the node may transmit the reservation signal in the reservation signal time zone, receive the signal in the reservation signal time zone, subtract the reservation signal of the node from the received signal, and detect that the other node has transmitted the reservation signal based on the subtraction result. If the subtraction result is greater than the threshold value, the node may determine that the reservation signal has been transmitted from another node.
For example, as shown in fig. 1, the reservation signal period may include 1 reservation signal time zone. The priority rule is set to be higher as the sequence index is smaller. In the reservation signal time interval, ue#1 transmits a reservation signal using the sequence of sequence index #1, and ue#3 transmits a reservation signal using the sequence of sequence index # 3. The ue#1 may also detect a reservation signal from the ue#3 by subtracting the reservation signal of the ue#1 from the reception signal in the reservation signal time interval. The ue#3 detects a reservation signal from the ue#1 by subtracting the reservation signal of the ue#3 from the reception signal in the reservation signal time zone. Since ue#1 has a higher priority than ue#3, ue#1 transmits a specific signal during a specific signal period, and ue#3 does not transmit a specific signal.
Method for identifying other node signals 2
When at least one reservation signal is received, the NW may transmit a response signal indicating the most prioritized node or the highest priority among the received reservation signals. The NW may transmit the response signal during the response signal period. In this case, the node may not support simultaneous transmission and reception in the same time resource and frequency resource (or may not have the capability of simultaneous transmission and reception in the same time resource and frequency resource).
The response signal period may be between the reservation signal period and the specific signal period. A gap may also be provided between the answer signal period and the specific signal period. The time length of the gap may be equal to or longer than the time required from the reception of the response signal to the transmission of the specific signal. The response signal period may be after each reservation signal period.
The node may receive the response signal and determine whether or not the node transmits a specific signal based on the response signal. The node may also determine whether the node transmits the specific signal by comparing the priority indicated by the received response signal with the priority of the node. The node may determine that the node transmits the specific signal when the priority indicated by the received response signal is the priority of the node. The node may determine that the node does not transmit the specific signal if the priority indicated by the received response signal is higher than the priority of the node.
For example, as shown in fig. 2, the reservation signal period may include 1 reservation signal time zone. The priority rule is set to be higher as the sequence index is smaller. In the reservation signal time interval, ue#1 transmits a reservation signal using the sequence of sequence index #1, and ue#3 transmits a reservation signal using the sequence of sequence index # 3. The NW that receives the reservation signals from the UEs #1 and #3 may transmit a response signal indicating that the UE #1 is the most preferable in the response signal period. The UE #1 that received the response signal transmits the specific signal in the specific signal period. The UE #3 that received the response signal does not transmit a specific signal.
According to embodiment 3 described above, the reservation signal period can be shortened, and the overhead of the reservation signal can be reduced.
Embodiment 4 >
The reservation signal may indicate at least one of information (at least one of time resource, frequency resource, space resource, and code resource) of a resource of the specific signal and information of a transmission destination of the specific signal. The reservation signal may also be a SCI sent from the UE to another UE. The information of the resource of the specific signal may also be referred to as information of the resource for bidding the specific signal (bidding information).
The reservation signal may also contain DMRS as well as data. The data may also contain bidding information. DMRS may also multiplex data, such as time division multiplexing (Time Division Multiplex (TDM)) or frequency division multiplexing (Frequency Division Multiplex (FDM)).
The reservation signal may also be a resource associated with the bidding information. The resource may be at least one of a time resource (e.g., symbol, etc.), a frequency resource (e.g., RB, etc.), a spatial resource (e.g., spatial layer, antenna port, etc.), and a coding resource (e.g., sequence index, reference sequence, cyclic shift, etc.). Multiple candidates for the resource may also be associated with each of the multiple candidates for bidding information. The node may also select a resource associated with the bidding information and transmit a reservation signal using the selected resource.
In fig. 3, the specific signal of ue#1 may use symbols #0 to #2 in the specific signal period, and the specific signal of ue#3 may use symbol #3 in the specific signal period. The UEs #1 and #3 may transmit the reservation signal indicating the bidding information in a predetermined reservation signal time zone within the reservation signal period.
The bidding information may also be the start timing and duration of a particular signal. The start timing of the specific signal can also be represented by an index of the unit time resource. The duration of a particular signal may also be represented by the number of resources per unit time. The unit time resource may also be at least one of a slot and a symbol. The start timing may be represented by a difference value with respect to the start or end of the reservation signal time zone (transmission of the reservation signal), or may be represented by a difference value with respect to the start or end of the reservation signal period.
In fig. 3, the bidding information of ue#1 may indicate a start symbol #0 and a time period of 3 symbols, and the bidding information of ue#3 may indicate a start symbol #3 and a time period of 1 symbol.
The bidding information may also be a bitmap representing resources of a specific signal (specific signal time interval). The specific signal time interval may be a slot or a symbol. Bits of the bitmap may also correspond to specific signal time intervals.
In fig. 3, the bidding information of ue#1 may be 1110, and the bidding information of ue#3 may be 0001. Each bit may indicate whether (1) or (0) a specific signal is transmitted in each specific signal time interval (symbol) during the specific signal.
According to embodiment 4, it is possible to determine whether or not the specific signal time zone can be utilized by receiving the reservation signal from another node, and therefore, it is possible to improve the utilization efficiency of the resources in the specific signal time zone.
Embodiment 5 >
Nodes that cannot acquire a particular signal resource by reserving a signal (bid failure) may also transmit the particular signal using the free resources during the particular signal. The free resources may be resources not represented by any reservation signal during the specific signal period.
Each node may monitor the reservation signal in the reservation signal time interval other than the reservation signal time interval of the node.
For example, in the example of fig. 4, the priorities are ue#0, #1, #2, #3. Each of UEs #0 to #3 transmits a reservation signal in 1 reservation signal time interval. The bidding information of ue#0 indicates a specific signal resource of a starting symbol #0 and a time length of 2 symbols, the bidding information of ue#1 indicates a specific signal resource of a starting symbol #0 and a time length of 1 symbol, and the bidding information of ue#0 indicates a specific signal resource of a starting symbol #2 and a time length of 1 symbol.
The specific signal resource of UE #3 does not overlap with the specific signal resource of other UEs, and thus the specific signal resource is acquired and the specific signal is transmitted in the specific signal resource. The specific signal resource of ue#0 overlaps with the specific signal resource of ue#1. Ue#0 having a higher priority than that of ue#1 acquires a specific signal resource, and transmits a specific signal in the specific signal resource. On the other hand, ue#1 cannot acquire a specific signal resource.
The 1 st node may not transmit a reservation signal indicating a resource overlapping with the resource indicated by the reservation signal of the 2 nd node. The 1 st node may transmit a reservation signal indicating a resource overlapping with the resource indicated by the reservation signal of the 2 nd node when the reservation signal from the 2 nd node cannot be decoded before the transmission of the reservation signal due to a time required for data demodulation.
A node that has transmitted a reservation signal indicating a specific signal resource that does not overlap with the resources indicated by reservation signals from other nodes may acquire the specific signal resource and transmit a specific signal in the specific signal resource. A node that has transmitted a reservation signal indicating a specific signal resource overlapping with a resource indicated by a reservation signal from another node may determine that the specific signal resource cannot be acquired.
The node may receive a reservation signal having a higher priority than the priority of its own reservation signal without using the free resources in the specific signal period.
In the case of using the free resources in the specific signal period, the node may receive all reservation signals other than the reservation signal of the node in the reservation signal period.
If a plurality of nodes that have transmitted the reservation signal cannot acquire the specific signal resource, the node that uses the free resource may be determined according to at least one of the following free resource utilization methods 1 to 3.
Idle resource utilization method 1
When a plurality of nodes that have transmitted the reservation signal cannot acquire the specific signal resource, a node having the highest priority among the plurality of nodes may acquire the free resource, and the specific signal may be transmitted by using the free resource (or the free resource may be acquired). The node having the highest priority may acquire the free resources while being able to transmit a specific signal in the free resources (the size of the free resources is equal to or larger than the size of the specific signal resources).
Fig. 5 is a diagram showing an example of a case where a specific signal is transmitted in the idle resource in fig. 4. Since the priority of ue#1 is lower than that of ue#0, ue#1 cannot acquire the specific signal resource indicated by the reservation signal, but can transmit the specific signal in the idle resource (symbol#3) not indicated by any reservation signal (the size of the idle resource is not less than the size of the specific signal resource of ue#1), and thus transmit the specific signal.
Idle resource utilization method 2
If a plurality of nodes that have transmitted the reservation signal cannot acquire the specific signal resource, the nodes having priority levels of the first m among the plurality of nodes may be allocated with the free resources. The priority may also be associated with the transmission order of the reservation signal. The idle resources may also be equally divided into m idle time intervals (specific signal resources) in the time direction. The m idle time intervals may also be allocated to the m nodes in order from high priority (descending order of priority). The node to which the idle time interval is allocated may also transmit a specific signal in the idle time interval.
M may be specified by the standard or may be set by high-level signaling.
Idle resource utilization method 3
In the case where a plurality of nodes that have transmitted the reservation signal cannot acquire the specific signal resource, each of the plurality of nodes may determine whether to transmit the specific signal based on the random number.
If the number of nodes that cannot acquire a specific signal resource (the number of nodes that fail bidding) is n, each node may transmit a specific signal in the idle resource with a probability of 1/n. When the number of bidding failure nodes is n, each node may transmit a specific signal in the idle resource with a probability of 1/n×α (α Σ1). Alpha may be specified by the standard or may be set by high-level signaling.
According to embodiment 5 above, the node that fails the bidding can transmit the specific signal, and the utilization efficiency of the resource can be improved.
Embodiment 6 >
The resources of the reservation signal (e.g., the reservation signal time interval) may not be given to the node alone (or may not be set alone for the UE, or may not be based on the UE index). The resources of the reservation signals of the plurality of nodes may be common, and the reservation signals of the plurality of nodes may collide.
The reservation signal period may be 1 reservation signal time period (for example, 1 symbol) common to a plurality of nodes.
Each node may recognize a reservation signal (collision of reservation signals) from another node according to at least one of the other node signal recognition methods 1 and 2. If the node that transmitted the reservation signal recognizes a collision of the reservation signal, the node may perform at least one of the following collision processes 1 and 2.
Conflict handling 1
If the node that transmitted the reservation signal recognizes the collision of the reservation signal, the specific signal may not be transmitted.
Conflict handling 2
When the node that transmitted the reservation signal detects a collision of the reservation signal, it may be determined whether or not to transmit the specific signal in the specific signal resource based on the random number.
The node that transmits the reservation signal and detects the collision of the reservation signal may transmit the specific signal in the specific signal resource with a probability of 1/mxα (α Σ Σ1). When the number of bidding failure nodes is n, each node may transmit a specific signal in a specific signal resource with a probability of 1/mxα (α Σ Σ1) based on a random number. M may be the number of nodes using 1 reservation signal time zone (or the maximum number of nodes using 1 reservation signal time zone). M may be specified by a standard or may be set by high-level signaling. Alpha may be specified by the standard or may be set by high-level signaling.
The node may also determine whether to send a particular signal in a particular signal resource based on machine learning (or ARTIFICIAL INTELLIGENCE (AI, artificial intelligence)). The node may store at least one of information related to transmission of a reservation signal of the node, a recognition result of a reservation signal from another node, and a recognition result of a collision of reservation signals. The node may also determine whether to transmit a particular signal in a particular signal resource based on the stored content (history). The node may determine (optimize) a specific signal transmission rule (for example, a decision criterion for specific signal transmission, a probability of transmission of a specific signal, or the like) based on the storage content, and determine whether or not to transmit the specific signal in the specific signal resource based on the specific signal transmission rule. For example, the node may determine a probability based on the stored content and transmit a specific signal with the determined probability based on the random number.
For example, as shown in fig. 6, UEs #0 to #3 are set to the same reservation signal time zone. Each UE determines a probability of transmitting the specific signal, and transmits the specific signal in a specific signal period when the random number matches the probability.
According to embodiment 6 described above, the reservation signal period can be shortened, and the resource utilization efficiency can be improved.
Embodiment 7 >
Each node may perform transmission of the 1 st signal using a candidate of the transmission setting (setting information), and determine the transmission setting to be used for transmission of the 2 nd signal based on at least one of the reception result of the 1 st signal from the node and the reception result of the 1 st signal from another node.
The transmission setting may also include at least one of a transmission power and a transmission beam (e.g., a spatial domain transmission filter). By transmitting the beam, the gain in the direction of one node can be increased, and the gain in the direction of the other node can be reduced.
The reception result, the reception quality, and the measurement result may be replaced with each other.
The 1 st signal may be at least one of a transmission (e.g., a reservation signal) CDM with a signal (e.g., a reservation signal) from at least one node, a signal (e.g., a measurement signal) used for measurement of at least one of a distance between nodes and a path loss, and a transmission (e.g., a reservation signal) transmitted prior to other signals. The 2 nd signal may be at least one of a1 st signal (for example, a reservation signal after a next transmission opportunity) after the 1 st signal and a transmission (for example, a specific signal or a signal for transmitting data) based on the 1 st signal.
Each node (e.g., UE) may also perform quasi-optimization of the reception quality between nodes by controlling transmission settings (transmission parameters, setting information). The quasi-optimization of the reception quality may be performed while minimizing degradation of the reception quality.
The node may receive the 1 st signal from the other node and store the reception quality of the 1 st signal, or may notify the other node of the reception quality of the 1 st signal.
The reception quality may be at least one of throughput of an actual 2 nd signal (e.g., data), an actual bit error rate (e.g., bit Error Rate (BER), block error rate (BLER, block error rate), packet error rate (PER, packet error rate), etc.), a measurement result of a1 st signal in at least one node (e.g., at least one of received power (RSRP, received signal strength), SINR, SNR), whether or not reception of at least one 1 st signal in at least one node is successful, a reception success number of a1 st signal (of at least one transmission opportunity) in a certain period in at least one node, and a reception success rate of a1 st signal (of at least one transmission opportunity) in a certain period in at least one node.
The 1 st signal from multiple nodes may also be CDM.
The node may also determine the sequence of the received 1 st signal. For example, the node may determine the correlation between the specific sequence of the 1 st signal and the received 1 st signal, and if the correlation is greater than a threshold (or the correlation is equal to or greater than the threshold), it may recognize that the specific sequence is received (that the specific sequence is successfully received).
The node may notify the number of 1 st signals subjected to CDM (the number of UEs subjected to CDM) as the multiplexing number, or may notify the maximum number of 1 st signals subjected to CDM (the maximum number of UEs subjected to CDM) as the multiplexing number. For example, when the node notifies the multiplexing number, a value obtained by dividing the reception success number by the multiplexing number may be calculated as the reception success rate.
For example, as in embodiment 3, it is assumed that each of UEs #1, #2, and #3 transmits a reservation signal in the same reservation signal transmission section, and the reservation signals broadcast from UEs #1, #2, and #3 are CDM (transmitted in the same time resource and the same frequency resource). As shown in fig. 7, when the distance D12 between the UEs #1 and #2 is greater than the distance D23 between the UEs #2 and #3, the received power from the UE #1 is different from the received power from the UE #2 in the UE #3 when the distance D13 between the UEs #1 and #3 is greater than the distance D23 between the UEs #2 and # 3. When the received powers are different, the signal from ue#2 interferes with the signal from ue#1 (for example, also referred to as near-far problem (near-far problem)).
For example, by equalizing the received power of the reservation signals from the other UEs in each of UEs #1, #2, and #3, orthogonality between the reservation signals of UEs #1, #2, and #3 can be improved, and reception quality can be improved.
The transmitting node may also transmit a measurement signal for measuring a distance or path loss between the transmitting node and the receiving node (e.g., UE-UE or UE-NW). The measurement signal period (or the measurement signal time interval of each node) for transmitting the measurement signal may be configured. The measurement signal period may be different from the reservation signal period and the specific signal period.
The transmission of the measurement signal may be set to at least one of periodic (periodic) transmission, semi-persistent (semi-persistent) transmission, and aperiodic (aperiodic) transmission.
The measurement signal may be an orthogonal sequence or a quasi-orthogonal sequence. The measurement signal may be a low PAPR sequence (CAZAC sequence, a sequence conforming to CAZAC sequence, e.g., zadoff-Chu sequence, a computer-generated sequence defined by a standard (table), or the like), or a quasi-random sequence (PN sequence, e.g., gold sequence, M sequence).
The transmission power of the measurement signal may be lower than the transmission power of the specific signal, or may be controlled. The measurement signal may be continuous in the frequency domain or discontinuous in the frequency domain (e.g., a combo structure). The measurement signal may also hop according to a hopping pattern. The hopping pattern (frequency resource of the measurement signal) may be based on at least one of slot index, symbol index, (imaginary) cell index, bandwidth (e.g., PRB number, RE number).
The measurement signal may be a new type (e.g., rel.16 later) signal or channel, or may be an existing (e.g., rel. 15) channel or signal (e.g., RS). The measurement signal may be soundingreference signal (SRS, sounding reference signal), or may be SRS having a transmission power different from that of the conventional SRS. The transmission power of the measurement signal may be lower than the transmission power of the existing SRS.
The nodes may also estimate the distance or path loss between the nodes based on the received power of the measured signal.
Multiple UEs may also be grouped (2 UE pairs). The plurality of UEs may be set to a group (UEs included in the group) by higher layer signaling, or may determine the group. The group may also be determined based on distance or path loss (e.g., group of UEs below a particular distance, shortest-distance peer).
A group may also contain 1 head UE. The header UE may also be set by NW. The head UE may also schedule UEs within the group (e.g., nearby UEs, UEs located below a certain distance). The head UE may also be determined based on the distance between UEs within the group. For example, the head UE may also be a UE capable of communicating with the largest number of UEs within the group.
In addition, the head UE, the management UE, the local manager (local manager), the specific UE, and the designated UE may be replaced with each other.
The node may control the transmission setting by at least one of the following transmission setting control methods 1 to 3.
Transmission setting control method 1
Each node may transmit the 1 st signal with a different candidate of the transmission setting (transmission setting candidate) at each transmission opportunity of the 1 st signal. Multiple transmission setting candidates may also be associated with each of the multiple transmission opportunities.
The 1 st signal may be a reservation signal or a measurement signal. The transmission opportunity of the 1 st signal may be a reserved signal period or a measurement signal period.
The node may determine an index of a transmission setting candidate (transmission setting candidate index) for each transmission opportunity based on at least one of a UE index (UE ID, radio Network Temporally Identifier (RNTI, radio network temporary identifier)), a slot index of the transmission opportunity, a symbol index of the transmission opportunity, and a cell (or virtual cell) index. The node may transmit the 1 st signal in the transmission opportunity by using the transmission setting corresponding to the determined transmission setting candidate index. The node may determine the transmission setting candidate index (hop the transmission setting candidate index) by using a calculation formula of at least one of the UE index, the slot index of the transmission opportunity, the symbol index of the transmission opportunity, and the cell (or virtual cell) index.
The node may transmit the 1 st signal using the determined transmission setting candidate.
The node may calculate (measure and store) the reception quality of the 1 st signal from another node, notify the calculated reception quality by the next 1 st signal, or notify the calculated reception quality by the 2 nd signal of the transmission resource (scheduled by the 1 st signal) determined based on the 1 st signal. The 2 nd signal may be a specific signal, a response signal, a signal (channel) for transmitting data, or the like.
The plurality of reception qualities notified from the other nodes may be associated with each of the plurality of transmission settings. The information notified from the other nodes may also contain information (e.g., UE ID) identifying the reception quality and the node.
The node may determine (select) 1 of the plurality of transmission setting candidates as the transmission setting based on at least one of the reception quality calculated by the node and the reception quality notified from the other node, and use the transmission setting for the transmission of the 2 nd signal. For example, the node may determine, as the transmission setting, a transmission setting candidate giving the highest reception quality to all nodes having the reception quality from among a plurality of transmission setting candidates.
The node may apply transmission settings to the subsequent transmission of the 2 nd signal.
The node may periodically execute the transmission setting control method 1 to update the transmission setting. The node may execute the transmission setting control method 1 in response to the notification (setting, instruction, request) from the NW, and update the transmission setting. The node performs the transmission setting control method 1 periodically or in response to a notification from the NW, and can thereby cause the transmission setting to follow a change in the situation.
According to this transmission setting control method 1, the node can easily control the transmission setting, and can suppress the load of control of the transmission setting.
Transmission setting control method 2
The node may determine 1 of the plurality of transmission setting candidates in the transmission setting control method 1 by using machine learning (MACHINE LEARNING, ARTIFICIAL INTELLIGENCE (AI, artificial intelligence), deep learning (DEEP LEARNING)), and transmit the 2 nd signal by using the determined transmission setting candidate.
The input of the machine learning may include at least one of a transmission setting used for the past 1 st signal transmission of the own node, a history of the reception quality of the 1 st signal in at least one node (at least one of the own node and other nodes), information (distance, path loss, transmission power, etc.) related to the distance between the nodes, and at least one throughput (for example, throughput of a specific signal, throughput in a group, throughput between all the nodes capable of communication, etc.) notified from other nodes (for example, NW, head UE, etc.).
The output of the machine learning may be a transmission setting candidate (for example, a transmission setting candidate index) used for the transmission of the following 2 nd signal.
According to the transmission setting control method 2, the node can quickly (efficiently) determine the transmission setting candidates as compared with the transmission setting control method 1, and the reception quality can be improved.
Transmission setting control method 3
Each node may transmit the 1 st signal with one of different transmission setting candidates for each transmission opportunity of the 1 st signal.
The node may randomly determine the transmission setting candidate index for each transmission opportunity. The node may determine the transmission setting candidate index (jump the transmission setting candidate index) for each transmission opportunity by the same calculation formula as that of the transmission setting control method 1. The node may use a transmission setting candidate (transmission setting candidate index) set in advance.
The node may transmit the 1 st signal using the determined transmission setting candidate (transmission setting candidate index).
The node may also calculate (measure, store) the reception quality of the 1 st signal from the other node.
The node may determine (select) one of a plurality of transmission setting candidates as a transmission setting based on the reception quality calculated by the node, and use the transmission setting for transmission of the 2 nd signal. For example, the node may determine, as the transmission setting, a transmission setting candidate giving the highest reception quality to all nodes having the reception quality from among a plurality of transmission setting candidates.
The node may apply transmission settings to the subsequent transmission of the 2 nd signal.
For example, when the received power of the 1 st signal from another node is smaller than the threshold, the node may set the transmission power in the transmission setting to be larger than the transmission power used for transmitting the 1 st signal, and use the transmission power as the transmission setting.
For example, when the received power of the 1 st signal from another node is larger than the threshold, the node may set the transmission power in the transmission setting to be smaller than the transmission power used for the transmission of the 1 st signal, and use the transmission power as the transmission setting.
For example, when the variation in the received power from a plurality of other nodes is large (for example, the difference in the received power from a plurality of nodes is larger than a threshold value, and the received power from a plurality of nodes spans a specific plurality of ranges), the node may set the transmission power in the transmission setting to be smaller than the transmission power used for the transmission of the 1 st signal as the transmission setting. The transmission power in the next transmission setting may be determined to be a specific value. The node may determine a specific value based on an average value of the received power from a plurality of other nodes, or may use a value specified by a standard as the specific value.
The node may periodically execute the transmission setting control method 3 to update the transmission setting. The node may execute the transmission setting control method 3 in response to the notification (setting, instruction, request) from the NW, and update the transmission setting.
According to the transmission setting control method 3, since the node does not need to notify the reception quality of other nodes as compared with the transmission setting control method 1, the transmission setting can be easily controlled, and the load of control of the transmission setting can be suppressed.
The node may apply the determined transmission setting to the 1 nd signal of the following setting objects 1 to 3.
Setting object 1
The 2 nd signal may be the 1 st signal after the transmission setting is determined. For example, the node may apply the determined transmission setting to a subsequent reservation signal.
The node may apply a control different from the control (for example, one of the transmission setting control methods 1 to 3) for the transmission setting of the reservation signal to the specific signal. For example, the node may also apply the same transmit power control as PUSCH (e.g., rel.15nr PUSCH) to a particular signal.
Set object 2
The 2 nd signal may be a signal transmitted based on the 1 st signal. For example, the node may apply the decided transmission setting to a specific signal.
The node may apply a control different from the control of the transmission setting for the specific signal (for example, one of the transmission setting control methods 1 to 3) to the reservation signal. For example, the node may apply a transmission power of a specific value to the reservation signal, or may apply closed loop (closed loop) transmission power control or open loop (open loop) transmission power control similar to PUSCH (e.g., PUSCH of rel.15nr) to the reservation signal.
Setting object 3
The 2 nd signal may be both the 1 st signal after the transmission setting is determined and the signal transmitted based on the 1 st signal. For example, the node may apply the determined transmission setting to both the reservation signal and the specific signal.
According to embodiment 7 above, a transmission setting suitable for the 2 nd signal can be applied. Thus, even when CDM is performed on the 2 nd signal from a plurality of nodes, the reception quality of the 2 nd signal can be improved.
(Wireless communication System)
The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.
Fig. 8 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication by using long term evolution (Long Term Evolution) (LTE) standardized by the third generation partnership project (Third Generation Partnership Project) (3 GPP), new wireless (5 th generation mobile communication system New Radio) (5G NR) of the fifth generation mobile communication system, or the like.
The wireless communication system 1 may support dual connection between a plurality of radio access technologies (Radio Access Technology) (RATs) (Multi-RAT dual connection (Multi-RAT Dual Connectivity (MR-DC))). The MR-DC may also include a dual connection of LTE (evolved universal terrestrial radio Access (Evolved Universal Terrestrial Radio Access (E-UTRA))) with NR (E-UTRA-NR dual connection (E-UTRA-NR Dual Connectivity (EN-DC))), a dual connection of NR with LTE (NR-E-UTRA dual connection (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.
In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station (gNB) of NR is MN and the base station (eNB) of LTE (E-UTRA) is SN.
The wireless communication system 1 may also support dual connections between multiple base stations within the same RAT (e.g., dual connection (NR-NR dual connection (NR-NR Dual Connectivity (NN-DC))) of a base station (gNB) where both MN and SN are NRs).
The radio communication system 1 may further include: a base station 11 forming a macro cell C1 having a relatively wide coverage area, and base stations 12 (12 a-12C) disposed in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to those shown in the drawings. Hereinafter, the base station 11 and the base station 12 are collectively referred to as a base station 10 without distinction.
The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) using a plurality of component carriers (Component Carrier (CC)) and Dual Connectivity (DC).
Each CC may be included in at least one of the first Frequency band (Frequency Range 1 (FR 1)) and the second Frequency band (Frequency Range 2 (FR 2))). The macrocell C1 may be included in the FR1 and the small cell C2 may be included in the FR 2. For example, FR1 may be a frequency band of 6GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24GHz (above-24 GHz). The frequency bands, definitions, and the like of FR1 and FR2 are not limited thereto, and for example, FR1 may correspond to a frequency band higher than FR 2.
The user terminal 20 may communicate with at least one of time division duplex (Time Division Duplex (TDD)) and frequency division duplex (Frequency Division Duplex (FDD)) in each CC.
The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based on a common public radio interface (Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is utilized as a Backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher-level station may be referred to as an Integrated Access Backhaul (IAB) donor (donor), and the base station 12 corresponding to a relay station (relay) may be referred to as an IAB node.
The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The Core Network 30 may include at least one of an evolved packet Core (Evolved Packet Core (EPC)), a 5G Core Network (5 GCN), a next generation Core (Next Generation Core (NGC)), and the like, for example.
The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.
In the wireless communication system 1, a wireless access scheme based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) may be used. For example, cyclic prefix OFDM (Cyclic Prefix OFDM (CP-OFDM)), discrete fourier transform spread OFDM (Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access (OFDMA)), single carrier frequency division multiple access (SINGLE CARRIER Frequency Division Multiple Access (SC-FDMA)), and the like may be used in at least one of Downlink (DL)) and Uplink (UL).
The radio access scheme may also be referred to as waveform (waveform). In the radio communication system 1, other radio access schemes (for example, other single carrier transmission schemes and other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.
In the radio communication system 1, as the downlink channel, a downlink shared channel (physical downlink shared channel (Physical Downlink SHARED CHANNEL (PDSCH))), a broadcast channel (physical broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (physical downlink control channel (Physical Downlink Control Channel (PDCCH))), or the like shared by the user terminals 20 may be used.
In the radio communication system 1, as the Uplink channel, an Uplink shared channel (Physical Uplink SHARED CHANNEL (PUSCH))), an Uplink control channel (Physical Uplink control channel Physical Uplink Control Channel (PUCCH))), a Random access channel (Physical Random access channel ACCESS CHANNEL (PRACH))), or the like shared by the user terminals 20 may be used.
User data, higher layer control information, system information blocks (System Information Block (SIBs)), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted through PUSCH. In addition, a master information block (Master Information Block (MIB)) may also be transmitted through the PBCH.
Lower layer control information may also be transmitted through the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI))) including scheduling information of at least one of PDSCH and PUSCH.
The DCI for scheduling PDSCH may be referred to as DL assignment, DL DCI, or the like, and the DCI for scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. The PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.
In the detection of the PDCCH, a control resource set COntrol REsource SET (CORESET)) and a search space SEARCH SPACE may also be used. CORESET corresponds to searching for a resource of DCI. The search space corresponds to a search region of the PDCCH candidate (PDCCH CANDIDATES) and a search method. 1 CORESET may also be associated with 1 or more search spaces. The UE may also monitor CORESET associated with a certain search space based on the search space settings.
One search space may also correspond to PDCCH candidates that correspond to 1 or more aggregation levels (aggregation Level). The 1 or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like of the present disclosure may also be replaced with each other.
Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (CHANNEL STATE Information (CSI)), acknowledgement information (for example, also referred to as a hybrid automatic retransmission request (Hybrid Automatic Repeat reQuest (HARQ-ACK)), ACK/NACK, etc.), and a scheduling request (Scheduling Request (SR)) may be transmitted through the PUCCH. The random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.
In addition, in the present disclosure, downlink, uplink, etc. may also be expressed without "link". It may be expressed that the "Physical" is not provided at the beginning of each channel.
In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a Downlink reference signal (Downlink REFERENCE SIGNAL (DL-RS)), and the like may be transmitted. In the wireless communication system 1, as DL-RS, a Cell-SPECIFIC REFERENCE SIGNAL (CRS), a channel state Information reference signal (CHANNEL STATE Information REFERENCE SIGNAL (CSI-RS)), a demodulation reference signal (DeModulation REFERENCE SIGNAL (DMRS)), a Positioning reference signal (Positioning REFERENCE SIGNAL (PRS)), a phase tracking reference signal (PHASE TRACKING REFERENCE SIGNAL (PTRS)), and the like may be transmitted.
The synchronization signal may be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)), for example. The signal blocks including SS (PSS, SSs) and PBCH (and DMRS for PBCH) may be also referred to as SS/PBCH blocks, SS blocks (SSB)), or the like. In addition, SS, SSB, etc. may also be referred to as reference signals.
In the wireless communication system 1, as an Uplink reference signal (Uplink REFERENCE SIGNAL (UL-RS)), a measurement reference signal (Sounding REFERENCE SIGNAL (SRS)) and a demodulation reference signal (DMRS) may be transmitted. In addition, the DMRS may also be referred to as a user terminal specific reference signal (UE-SPECIFIC REFERENCE SIGNAL).
(Base station)
Fig. 9 is a diagram showing an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission path interface (transmission LINE INTERFACE) 140. The control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided with one or more components.
In this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.
The control unit 110 may also control generation of signals, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission/reception, measurement, and the like using the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140. The control unit 110 may generate data, control information, a sequence (sequence), and the like transmitted as signals, and forward the generated data to the transmitting/receiving unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
The transmitting/receiving unit 120 may include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting/receiving unit 120 may be configured of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (PHASE SHIFTER)), a measurement circuit, a transmitting/receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.
The transmitting/receiving unit 120 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission unit may be composed of the transmission processing unit 1211 and the RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
The transmitting/receiving antenna 130 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.
The transmitting/receiving unit 120 may transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmitting/receiving unit 120 may receive the uplink channel, the uplink reference signal, and the like.
The transmitting-receiving unit 120 may also form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.
The transmission/reception section 120 (transmission processing section 1211) may perform processing of a packet data convergence protocol (PACKET DATA Convergence Protocol (PDCP)) layer, processing of a radio link control (Radio Link Control (RLC)) layer (for example, RLC retransmission control), processing of a medium access control (Medium Access Control (MAC)) layer (for example, HARQ retransmission control), and the like with respect to data, control information, and the like acquired from the control section 110, for example, to generate a bit sequence to be transmitted.
The transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing, discrete fourier transform (Discrete Fourier Transform (DFT)) processing (if necessary), inverse fast fourier transform (INVERSE FAST Fourier Transform (IFFT)) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
The transmitting/receiving unit 120 (RF unit 122) may perform modulation, filter processing, amplification, etc. for the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmitting/receiving antenna 130.
On the other hand, the transmitting/receiving unit 120 (RF unit 122) may amplify, filter-process, demodulate a baseband signal, and the like, with respect to a signal in a radio frequency band received through the transmitting/receiving antenna 130.
The transmitting/receiving section 120 (reception processing section 1212) may apply, to the acquired baseband signal, reception processing such as analog-to-digital conversion, fast fourier transform (Fast Fourier Transform (FFT)) processing, inverse discrete fourier transform (INVERSE DISCRETE Fourier Transform (IDFT)) processing (if necessary), filter processing, demapping, demodulation, decoding (error correction decoding may be included), MAC layer processing, RLC layer processing, and PDCP layer processing, and acquire user data.
The transmitting-receiving unit 120 (measuring unit 123) may also perform measurements related to the received signals. For example, the measurement unit 123 may perform radio resource management (Radio Resource Management (RRM)) measurement, channel state information (CHANNEL STATE Information (CSI)) measurement, and the like based on the received signal. Measurement section 123 may also measure received Power (e.g., reference signal received Power (REFERENCE SIGNAL RECEIVED Power (RSRP)), received Quality (e.g., reference signal received Quality (REFERENCE SIGNAL RECEIVED Quality (RSRQ)), signal-to-interference-plus-noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal-to-noise ratio (Signal to Noise Ratio (SNR)), signal strength (e.g., received signal strength indicator (RECEIVED SIGNAL STRENGTH Indicator (RSSI))), propagation path information (e.g., CSI), and the like. The measurement results may also be output to the control unit 110.
The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices, other base stations 10, and the like included in the core network 30, or may acquire and transmit user data (user plane data), control plane data, and the like for the user terminal 20.
The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120 and the transmitting/receiving antenna 130.
The transmitting/receiving unit 120 may perform the 1 st signal transmission in the 1 st period in the periodic time interval. The control unit 110 may determine whether or not to perform the 2 nd signal transmission in the 2 nd period after the 1 st period in the time interval based on the priority of the 1 st signal transmission (embodiment 1).
(User terminal)
Fig. 10 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting/receiving unit 220, and a transmitting/receiving antenna 230. The control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided with one or more types.
In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.
The control unit 210 may also control the generation of signals, mapping, etc. The control unit 210 may control transmission/reception, measurement, and the like using the transmission/reception unit 220 and the transmission/reception antenna 230. The control unit 210 may generate data, control information, a sequence, and the like transmitted as signals, and forward the generated data to the transmitting/receiving unit 220.
The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting/receiving unit 220 may be configured of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.
The transmitting/receiving unit 220 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission means may be constituted by the transmission processing means 2211 and the RF means 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
The transmitting/receiving antenna 230 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.
The transceiver unit 220 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transceiver unit 220 may also receive the uplink channel, the uplink reference signal, and the like.
The transmitting-receiving unit 220 may also form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.
The transmission/reception section 220 (transmission processing section 2211) may perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) and the like with respect to the data, control information and the like acquired from the control section 210, and generate a bit sequence to be transmitted.
The transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion, and the like for a bit string to be transmitted, and output a baseband signal.
Further, whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing for transmitting the channel using a DFT-s-OFDM waveform, or, if not, the transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing.
The transmitting/receiving unit 220 (RF unit 222) may perform modulation, filter processing, amplification, etc. for the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmitting/receiving antenna 230.
On the other hand, the transmitting/receiving unit 220 (RF unit 222) may amplify, filter-process, demodulate a baseband signal, and the like, with respect to a signal in a radio frequency band received through the transmitting/receiving antenna 230.
The transmitting/receiving section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (error correction decoding may be included), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.
The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signals. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.
The transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220, the transmitting/receiving antenna 230, and the transmission path interface 240.
The transmission/reception section 220 may perform the 1 st signal transmission by using setting information including at least one of the transmission power and the spatial domain transmission filter. The control unit 210 may use one candidate among a plurality of candidates of the setting information for transmission of the 2 nd signal, the one candidate being a candidate based on at least one of a reception result of the 1 st signal transmission notified from at least one device and a reception result of the signal transmission from the at least one device.
The 1 st signal transmission may be at least one of: a transmission code division multiplexed with a signal transmission from the at least one apparatus, a transmission utilized in measurement of information related to a distance between the user terminal and the at least one apparatus, and a transmission preceding other signal transmissions.
The 2 nd signal transmission may be at least one of a1 st signal transmission subsequent to the 1 st signal transmission and a transmission based on the 1 st signal transmission.
The transmitting/receiving unit 220 may perform a plurality of 1 st signal transmissions using the plurality of candidates, respectively. The control unit 210 may also be notified of the reception results of the plurality of 1 st signal transmissions. The one candidate may also be based on the reception results of the plurality of 1 st signal transmissions.
The one candidate may also be based on at least one of a history of reception results of the 1 st signal transmission notified from the at least one device, a history of reception results of signals from other wireless communication devices, and information related to an estimated distance between the at least one device and the user terminal 20.
(Hardware construction)
The block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by one device physically or logically combined, or two or more devices physically or logically separated may be directly or indirectly connected (for example, by a wire, a wireless, or the like) and realized by these plural devices. The functional blocks may also be implemented by combining the above-described device or devices with software.
Here, the functions include judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notifying), communication (communicating), forwarding (forwarding), configuration (setting), reconfiguration (resetting (reconfiguring)), allocation (allocating, mapping (mapping)), assignment (assigning), and the like, but are not limited thereto. For example, a functional block (structural unit) that realizes the transmission function may also be referred to as a transmission unit (TRANSMITTING UNIT), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited.
For example, a base station, a user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 11 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 may be physically configured as computer devices including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
In addition, in the present disclosure, terms of devices, circuits, apparatuses, parts (sections), units, and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to not include a part of the devices.
For example, the processor 1001 is shown as only one, but there may be multiple processors. Further, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or by other means. The processor 1001 may be realized by one or more chips.
Each function in the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001, controlling communication via the communication device 1004, or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
The processor 1001, for example, causes an operating system to operate to control the entire computer. The processor 1001 may be configured by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmitting/receiving unit 120 (220), and the like described above may be implemented by the processor 1001.
Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be implemented for other functional blocks.
The Memory 1002 may be a computer-readable recording medium, and may be configured of at least one of a Read Only Memory (ROM), an erasable programmable Read Only Memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable Read Only Memory (ELECTRICALLY EPROM (EEPROM)), a random access Memory (Random Access Memory (RAM)), and other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable to implement a wireless communication method according to one embodiment of the present disclosure.
The storage 1003 may also be a computer-readable recording medium, for example, composed of at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an magneto-optical disk (for example, a Compact Disc read only memory (CD-ROM)), a digital versatile Disc, a Blu-ray (registered trademark) disk, a removable magnetic disk (removable Disc), a hard disk drive, a smart card (SMART CARD), a flash memory device (for example, a card, a stick, a key drive), a magnetic stripe (stripe), a database, a server, and other suitable storage medium.
The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. In order to realize at least one of frequency division duplexing (Frequency Division Duplex (FDD)) and time division duplexing (Time Division Duplex (TDD)), for example, the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be implemented by the communication device 1004. The transmitting and receiving units 120 (220) may be mounted physically or logically separately from the transmitting unit 120a (220 a) and the receiving unit 120b (220 b).
The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, a Light Emitting Diode (LED)) lamp, or the like that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
The processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus or may be configured by different buses between devices.
The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DIGITAL SIGNAL Processor (DSP)), an Application SPECIFIC INTEGRATED Circuit (ASIC), a programmable logic device (Programmable Logic Device (PLD)), and a field programmable gate array (Field Programmable GATE ARRAY (FPGA)), or may be configured to implement a part or all of the functional blocks by using the hardware. For example, the processor 1001 may also be installed with at least one of these hardware.
(Modification)
In addition, with respect to terms described in the present disclosure and terms required for understanding the present disclosure, terms having the same or similar meanings may be substituted. For example, channels, symbols, and signals (signals or signaling) may also be interchanged. In addition, the signal may also be a message. The reference signal (REFERENCE SIGNAL) can also be simply referred to as RS, and can also be referred to as Pilot (Pilot), pilot signal, etc., depending on the standard applied. In addition, the component carrier (Component Carrier (CC)) may also be referred to as a cell, frequency carrier, carrier frequency, etc.
A radio frame may also consist of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be formed of one or more slots in the time domain. The subframe may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).
Here, the parameter set may also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a Transmission time interval (Transmission TIME INTERVAL (TTI)), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in a frequency domain, a specific windowing (windowing) process performed by the transceiver in a time domain, and the like.
A slot may also be formed from one or more symbols in the time domain, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (SINGLE CARRIER Frequency Division Multiple Access (SC-FDMA)) symbols, and so on. Furthermore, the time slots may also be time units based on parameter sets.
The time slot may also contain a plurality of mini-slots. Each mini-slot may also be formed of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may also be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in a larger time unit than the mini-slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.
The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. The radio frames, subframes, slots, mini-slots, and symbols may also use other designations that each corresponds to. In addition, the frame, subframe, slot, mini-slot, symbol, and the like units in the present disclosure may also be replaced with each other.
For example, one subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and one slot or one mini-slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (for example, 1 to 13 symbols) shorter than 1ms, or may be a period longer than 1 ms. The unit indicating the TTI may be referred to as a slot, a mini-slot, or the like, instead of a subframe.
Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a base station performs scheduling for each user terminal to allocate radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited thereto.
The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like subjected to channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, a time interval (e.g., the number of symbols) to which a transport block, a code block, a codeword, etc. is actually mapped may also be shorter than the TTI.
In addition, when one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of the schedule can also be controlled.
A TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in 3gpp rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.
In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1ms or more.
A Resource Block (RB) is a Resource allocation unit of a time domain and a frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.
Further, the RB may also contain one or more symbols in the time domain, and may be one slot, one mini-slot, one subframe, or one TTI length. One TTI, one subframe, etc. may also be respectively composed of one or more resource blocks.
In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), resource element groups (Resource Element Group (REGs)), PRB pairs, RB peering.
Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.
A Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth or the like) may also represent a subset of consecutive common RBs (common resource blocks (common resource blocks)) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of the RB with reference to the common reference point of the carrier. PRBs may be defined in a BWP and numbered in the BWP.
The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For a UE, one or more BWP may be set within 1 carrier.
At least one of the set BWP may be active, and the UE may not contemplate transmission and reception of a specific signal/channel other than the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".
The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.
The information, parameters, and the like described in the present disclosure may be expressed in absolute values, relative values to a specific value, or other corresponding information. For example, radio resources may also be indicated by a particular index.
In the present disclosure, the names used for parameters and the like are not restrictive names in all aspects. Further, the mathematical formulas and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limiting names in all respects.
Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.
Information, signals, and the like can be output to at least one of a higher layer (upper layer) to a lower layer (lower layer) and a lower layer to a higher layer. Information, signals, etc. may also be input and output via a plurality of network nodes.
The input/output information, signals, and the like may be stored in a specific location (for example, a memory), or may be managed by a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.
The notification of information is not limited to the embodiment described in the present disclosure, but may be performed by other methods. For example, notification of information in the present disclosure may also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI)))), higher layer signaling (e.g., radio resource control (Radio Resource Control (RRC)) signaling, broadcast information (master information block (Master Information Block (MIB)), system information block (System Information Block (SIB)) or the like), medium access control (Medium Access Control (MAC)) signaling), other signals, or a combination thereof.
The physical Layer signaling may be referred to as Layer 1/Layer 2 (L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC ConnectionSetup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration)) message, or the like. The MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
Note that the notification of specific information (for example, notification of "X") is not limited to explicit notification, and may be performed implicitly (for example, by notification of no specific information or notification of other information).
The determination may be performed by a value (0 or 1) represented by one bit, a true or false value (boolean) represented by true or false, or a comparison of values (e.g., with a specific value).
Software, whether referred to as software (firmware), middleware (middleware-ware), microcode (micro-code), hardware description language, or by other names, should be broadly interpreted as meaning instructions, instruction sets, codes (codes), code segments (code fragments), program codes (program codes), programs (programs), subroutines (sub-programs), software modules (software modules), applications (applications), software applications (software application), software packages (software packages), routines (routines), subroutines (sub-routines), objects (objects), executable files, threads of execution, procedures, functions, and the like.
In addition, software, instructions, information, etc. may also be transmitted and received via a transmission medium. For example, in the case of transmitting software from a website, server, or other remote source (remote source) using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (Digital Subscriber Line (DSL)), etc.) and wireless technology (infrared, microwave, etc.), the at least one of wired and wireless technologies is included in the definition of transmission medium.
The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.
In the context of the present disclosure of the present invention, terms such as "precoding (precoding)", "precoder (precoder)", "weight (precoding weight)", "Quasi Co-Location (QCL)", "transmission setting indication state (Transmission Configuration Indication state (TCI state))", "spatial relationship)", "spatial filter (spatial domain filter)", "transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.
In the present disclosure, terms such as "Base Station (BS)", "radio Base Station", "fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gndb)", "access point", "transmission point (transmission point (TP))", "Reception Point (RP))", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. There are also cases where the base station is referred to by terms of a macrocell, a small cell, a femtocell, a picocell, and the like.
The base station can accommodate one or more (e.g., three) cells. In the case of a base station accommodating multiple cells, the coverage area of the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (remote radio head (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base station and the base station subsystem that is in communication service within that coverage area.
In the present disclosure, terms such as "Mobile Station (MS)", "User terminal", "User Equipment (UE)", "terminal", and the like can be used interchangeably.
In some cases, a mobile station is also referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, or a number of other appropriate terms.
At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle (drone), an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station further includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may be an internet of things (Internet of Things (IoT)) device such as a sensor.
In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the various aspects/embodiments of the present disclosure may also be applied to a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, may also be referred to as Device-to-Device (D2D)), vehicle-to-evaluation (V2X), or the like. In this case, the user terminal 20 may have the functions of the base station 10 described above. Note that the expressions "uplink" and "downlink" and the like may be replaced with expressions (e.g., "side") corresponding to communication between terminals. For example, the uplink channel, the downlink channel, and the like may be replaced with side channels.
Likewise, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.
In the present disclosure, the operation performed by the base station may be performed by an upper node (upper node) according to circumstances. Obviously, in a network comprising one or more network nodes (network nodes) with base stations, various actions to be performed for communication with a terminal may be performed by a base station, one or more network nodes other than a base station (e.g. considering Mobility MANAGEMENT ENTITY (MME)), serving-Gateway (S-GW), etc., but not limited thereto, or a combination thereof.
The embodiments described in the present disclosure may be used alone, in combination, or switched according to execution. The processing procedures, sequences, flowcharts, and the like of the embodiments and embodiments described in this disclosure may be changed in order as long as they are not contradictory. For example, for the methods described in the present disclosure, elements of the various steps are presented using the illustrated order, but are not limited to the particular order presented.
The various modes/embodiments described in the present disclosure can also be applied to long term evolution (Long Term Evolution (LTE)), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, fourth generation mobile communication system (4 th generation mobile communication system (4G)), fifth generation mobile communication system (5 th generation mobile communication system (5G)), future wireless access (Future Radio Access (FRA)), new wireless (New-Radio Access Technology (RAT)), new wireless (NR)), new wireless access (New Radio access (NX)), new generation wireless access (Future generation Radio access (FX)), global mobile communication system (Global System for Mobile communications (GSM (registered trademark)), CDMA2000, ultra mobile broadband (Ultra Mobile Broadband (UMB)), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX registered trademark)), IEEE 802.20, ultra WideBand (Ultra-wide (UWB)), bluetooth (registered trademark), other systems that utilize the wireless communication methods of them, and the like. Furthermore, multiple systems may also be applied in combination (e.g., LTE or LTE-a, in combination with 5G, etc.).
The term "based on" as used in the present disclosure does not mean "based only on" unless otherwise specified. In other words, the expression "based on" means "based only on" and "based at least on" both.
Any reference to elements using references to "first," "second," etc. in this disclosure does not fully define the amount or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not indicate that only two elements may be employed, or that the first element must take precedence over the second element in some manner.
The term "determining" as used in this disclosure encompasses in some cases a wide variety of actions. For example, "determining (deciding)" may also be regarded as a case where "determining (deciding)" is performed on determination (judging), calculation (computing), processing (processing), derivation (deriving), investigation (INVESTIGATING), search (looking up (lookup), search, inquiry (query)) (e.g., search in a table, database, or other data structure), confirmation (ASCERTAINING), or the like.
Further, "determination (decision)" may be regarded as a case where "determination (decision)" is made on reception (e.g., receiving information), transmission (e.g., transmitting information), input (input), output (output), access (accessing) (e.g., accessing data in a memory), or the like.
Further, "judgment (decision)" may be regarded as a case of "judgment (decision)" for a solution (resolving), a selection (selecting), a selection (choosing), a setup (establishing), a comparison (comparing), or the like. That is, the "judgment (decision)" can also be regarded as a case where some actions are "judged (decided)".
The "judgment (decision)" may be replaced with "assumption (assuming)", "expectation (expecting)", "consider (considering)", or the like.
The "maximum transmission power" described in the present disclosure may mean a maximum value of transmission power, may mean a nominal maximum transmission power (nominal UE maximum transmission power (the nominal UE maximum transmit power)), or may mean a nominal maximum transmission power (nominal UE maximum transmission power (the rated UE maximum transmit power)).
The terms "connected", "coupled", or all variants thereof as used in this disclosure mean all connections or couplings, either direct or indirect, between two or more elements thereof, and can include the case where one or more intervening elements are present between two elements that are "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination of these. For example, "connection" may be replaced with "access".
In the present disclosure, in the case of connecting two elements, it can be considered that one or more wires, cables, printed electrical connections, etc. are used, and electromagnetic energy having wavelengths in the radio frequency domain, the microwave region, the optical (both visible and invisible) region, etc. are used as several non-limiting and non-inclusive examples to "connect" or "combine" with each other.
In the present disclosure, the term "a is different from B" may also mean that "a is different from B". In addition, the term may also mean that "A and B are each different from C". Terms such as "separate," coupled, "and the like may also be similarly construed as" different.
In the present disclosure, when "including", and variations thereof are used, these terms are meant to be inclusive in the same sense as the term "comprising". Further, the term "or" as used in this disclosure does not refer to exclusive or.
In the present disclosure, for example, in the case where an article is appended by translation as in a, an, and the in english, the present disclosure may also include the case where a noun following the article is in plural form.
While the invention according to the present disclosure has been described in detail, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modification and variation without departing from the spirit and scope of the invention defined based on the description of the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not intended to limit the invention in any way.
Claims (9)
1. A terminal, having:
A transmission unit that performs 1 st signal transmission using setting information including at least one of transmission power and a spatial domain transmission filter; and
A control unit that, when a reception result of the 1 st signal transmission is notified from at least one device, uses one candidate based on the reception result among a plurality of candidates of the setting information for the 2 nd signal transmission; in the case where a signal transmission from the at least one apparatus is received, one candidate, among the plurality of candidates of the setting information, based on a reception result of the signal transmission from the at least one apparatus is used for the 2 nd signal transmission,
The 1 st signal and the 2 nd signal are reservation signals for reserving resources in a self-dispersing type multiplexing access system,
The 1 st signal transmission is code division multiplexed with a signal transmission from the at least one device.
2. The terminal of claim 1, wherein,
The 1 st signal transmission is at least one of the following transmissions: transmission utilized in measurement of information related to a distance between the terminal and the at least one device, and transmission prior to other signal transmissions.
3. The terminal according to claim 1 or 2, wherein,
The 2 nd signal transmission is at least one of a1 st signal transmission subsequent to the 1 st signal transmission and a transmission based on the 1 st signal transmission.
4. The terminal according to claim 1 or 2, wherein,
The transmitting unit performs a plurality of 1 st signal transmissions using the plurality of candidates respectively,
The control unit is notified of the reception results of the plurality of 1 st signal transmissions,
The one candidate is based on the reception results of the plurality of 1 st signal transmissions.
5. The terminal of claim 3, wherein,
The transmitting unit performs a plurality of 1 st signal transmissions using the plurality of candidates respectively,
The control unit is notified of the reception results of the plurality of 1 st signal transmissions,
The one candidate is based on the reception results of the plurality of 1 st signal transmissions.
6. The terminal according to claim 1 or 2, wherein,
The one candidate is based on at least one of the setting information, a history of reception results of the 1 st signal transmission notified from the at least one apparatus, a history of reception results of signal transmission from the at least one apparatus, and information related to an estimated distance between the at least one apparatus and the terminal.
7. The terminal of claim 3, wherein,
The one candidate is based on at least one of the setting information, a history of reception results of the 1 st signal transmission notified from the at least one apparatus, a history of reception results of signal transmission from the at least one apparatus, and information related to an estimated distance between the at least one apparatus and the terminal.
8. The terminal of claim 4, wherein,
The one candidate is based on at least one of the setting information, a history of reception results of the 1 st signal transmission notified from the at least one apparatus, a history of reception results of signal transmission from the at least one apparatus, and information related to an estimated distance between the at least one apparatus and the terminal.
9. A wireless communication method of a terminal, comprising:
A step of transmitting a1 st signal by using setting information including at least one of transmission power and a spatial domain transmission filter; and
When the reception result of the 1 st signal transmission is notified from at least one device, using one candidate based on the reception result among the plurality of candidates of the setting information for the 2 nd signal transmission; a step of using, in a case where a signal transmission from the at least one apparatus is received, one candidate based on a reception result of the signal transmission from the at least one apparatus among a plurality of candidates of the setting information for the 2 nd signal transmission,
The 1 st signal and the 2 nd signal are reservation signals for reserving resources in a self-dispersing type multiplexing access system,
The 1 st signal transmission is code division multiplexed with a signal transmission from the at least one device.
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| PCT/JP2019/016646 WO2020213127A1 (en) | 2019-04-18 | 2019-04-18 | User terminal and wireless communication method |
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| CN101814938A (en) * | 2009-02-19 | 2010-08-25 | 索尼公司 | Communication equipment, communication means and communication system |
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| JP5366494B2 (en) * | 2007-10-10 | 2013-12-11 | パナソニック株式会社 | Multi-carrier transmitter |
| JP6121931B2 (en) * | 2014-03-20 | 2017-04-26 | 株式会社Ｎｔｔドコモ | Mobile communication system, base station, and user equipment |
| JP2018023100A (en) * | 2016-07-22 | 2018-02-08 | 華碩電腦股▲ふん▼有限公司 | Method and device for transmission or reception using beam forming in radio communication system |
| JP6959235B2 (en) * | 2016-07-29 | 2021-11-02 | 株式会社Ｎｔｔドコモ | Terminals, wireless communication methods, base stations and systems |
| WO2018025908A1 (en) * | 2016-08-03 | 2018-02-08 | 株式会社Ｎｔｔドコモ | User terminal and wireless communication method |
| CN107800467A (en) * | 2016-09-05 | 2018-03-13 | 株式会社Ntt都科摩 | beam selection method and device |
| CN110463143B (en) * | 2017-03-24 | 2022-07-05 | 联发科技股份有限公司 | Method, user equipment and cellular station for effectively utilizing physical random access channel resources |
| CN109089322B (en) * | 2017-06-14 | 2021-01-08 | 维沃移动通信有限公司 | Uplink multi-beam transmission method, terminal and network equipment |
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