CN103024924B - Connection establishment method, device and system for D2D (device-to-device) terminals - Google Patents

Abstract

The embodiment of the present invention discloses a device-to-device D2D terminal connection establishment method, device and system. The method includes: a first user equipment UE sends a preamble to the base station; the first UE receives a random access response message sent by the base station in response to the preamble; the first UE sends a second preamble to the base station UE identity, the second UE is the D2D communication target of the first UE; the first UE receives the D2D link configuration parameters and RRC connection configuration parameters of the first UE returned by the base station in response to the second UE identity; the first The UE establishes a D2D connection with the second UE based on the D2D link configuration parameters of the first UE, and completes the establishment of the RRC connection with the base station based on the RRC connection configuration parameters.

Description

D2D terminal connection establishment method, device and system

technical field

The present invention relates to communication technologies, and in particular to a device to device (Device to Device, D2D) terminal connection establishment method, device and system.

Background technique

In a cell network, when a user equipment (User Equipment, UE) wants to communicate with other user equipment, it usually needs centralized control through a base station, for example, in an LTE network, an evolved base station (Evolved Node B, eNB) controls the calls of both parties. Signal connection process such as call establishment between UEs. The benefit of communication links between users being coordinated and controlled by the base station is that the base station can centrally manage the use of wireless resources in the cell, so that the wireless resources can be allocated reasonably and effectively, and at the same time, wireless interference between users can be well avoided. However, if two user equipments are relatively close to each other, if they still communicate through the base station, radio resources will be wasted. Compared with the communication mode of the cell mode, D2D communication can save half of the wireless resources in the case of transmitting the same amount of data. D2D communication is direct communication between terminals, so the information transmitted between terminals in D2D communication does not need to pass through the base station.

In an existing wireless network, when a UE in idle mode receives a paging message (paging) sent by the network side, it first needs to go through a Random Access (RA) process to obtain an uplink synchronization time advance A Timing Advance (TA) value and/or an appropriate transmit power value can be used to establish a connection with the network and then transmit user data.

Fig. 1 shows a signaling diagram of connection establishment between UE and eNB in the prior art.

Step 11, the first UE sends a preamble (Preamble) to the eNB;

Step 12, the eNB returns a random access response message (Random Access response message, RAresponse message) to the first UE, and the response message includes an uplink synchronization TA value and an appropriate transmission power;

Step 13, the first UE sends an RRC connection establishment request message to the eNB with the above transmission power;

Step 14, the eNB returns a conflict resolution message (contention resolution) to the first UE;

Step 15, the eNB returns the RRC connection configuration parameters to the first UE;

Step 16, the first UE sends an RRC connection establishment complete message to the eNB.

However, for D2D UEs that are closer to each other, the UEs have almost the same TA and/or transmit power, so when the eNB calls the second UE of the called party to perform D2D data transmission, if the base station follows the method shown in Figure 1 The communication method for establishing a connection with the second UE will cause the second UE of the called party to perform unnecessary random access procedures, thus increasing the time delay of connection establishment.

Contents of the invention

Embodiments of the present invention provide a connection establishment method, device, and system for D2D terminals, which can solve the problem caused by the unnecessary random access process performed by the called user terminal when UEs with relatively short distances perform D2D communication in the prior art. The problem of increased latency.

In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:

On the one hand, an embodiment of the present invention provides a method for establishing a device-to-device D2D terminal connection, including: a first user equipment UE sends a preamble to the base station; the first UE receives a response from the base station to the preamble The random access response message sent; the first UE sends the second UE identifier to the base station, and the second UE is the D2D communication target of the first UE; the first UE receives the response message returned by the base station in response to the second UE identifier D2D link configuration parameters and RRC connection configuration parameters of the first UE; the first UE establishes a D2D connection with the second UE based on the D2D link configuration parameters of the first UE, and completes the D2D connection based on the RRC connection configuration parameters The RRC connection with the base station is established.

On the other hand, an embodiment of the present invention provides a method for establishing a device-to-device D2D terminal connection, including: a second user equipment UE receives a paging message from a base station from a base station, and obtains a second UE UE based on the paging message. D2D link configuration parameters; the second UE establishes a D2D connection with the first UE based on the D2D link configuration parameters of the second UE.

On the other hand, an embodiment of the present invention provides a method for establishing a device-to-device D2D terminal connection, including: the second user equipment UE receives the D2D link configuration parameters and the RRC link configuration parameters of the second UE from the base station and forwarded by the first UE; Connection configuration parameters: the second UE establishes a D2D connection with the first UE based on the D2D link configuration parameters of the second UE, and completes the establishment of an RRC connection with the base station based on the RRC connection configuration parameters.

On the other hand, an embodiment of the present invention provides a method for establishing a device-to-device D2D terminal connection, including: receiving a preamble from a first UE; sending a random access response message to the first UE in response to the preamble; The first user equipment UE receives the second UE identifier; based on the second UE identifier, the D2D link configuration parameter of the first UE is sent to the first UE, and the D2D link configuration parameter of the first UE is used for the first UE. A D2D connection between the UE and the second UE.

On the other hand, an embodiment of the present invention provides a first user equipment UE, including: first sending means, configured to send a preamble to a base station, and used to send a second UE identity to the base station, the first The second UE is the D2D communication target of the first UE; the first receiving means is used for receiving the random access response message sent by the base station in response to the preamble, and for receiving the response message returned by the base station in response to the second UE identity D2D link configuration parameters and RRC connection configuration parameters of the first UE; and first connection establishment means, configured to establish a D2D connection with the second UE based on the D2D link configuration parameters of the first UE, and based on the The RRC connection configuration parameters complete the establishment of the RRC connection with the base station.

On the other hand, an embodiment of the present invention provides a second user equipment UE, including: second receiving means, configured to receive a paging message from the base station from the base station, and obtain the D2D information of the second UE based on the paging message. Link configuration parameters; second connection establishing means, configured to establish a D2D connection with the first UE based on the D2D link configuration parameters of the second UE.

On the other hand, an embodiment of the present invention provides a second user equipment, including: a third receiving device, configured to receive the D2D link configuration parameter and the RRC connection configuration parameter of the second UE from the base station and forwarded by the first UE and a third connection establishment device, configured to establish a D2D connection with the first UE based on the D2D link configuration parameters of the second UE, and complete the RRC connection establishment with the base station based on the RRC connection configuration parameters.

On the other hand, an embodiment of the present invention provides a base station, including: a fourth receiving device, configured to receive a preamble from a first UE, and to receive a second UE identifier from a first user equipment UE; a fourth sending An apparatus, configured to send a random access response message to the first UE in response to the preamble, and send a D2D link configuration parameter of the first UE to the first UE based on the second UE identifier, the first UE The D2D link configuration parameters are used for the D2D connection between the first UE and the second UE.

On the other hand, an embodiment of the present invention provides a communication system, including the foregoing first user equipment, second user equipment, and a base station.

In the embodiment of the present invention, only the random access process between the calling user equipment and the base station is required, and the random access process does not need to be repeated between the called user equipment and the base station, thereby reducing the time delay for establishing a D2D connection. The embodiment of the present invention can also avoid the influence of the paging process on the core network, and further reduce the time delay of establishing a D2D connection.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a signaling diagram for establishing a connection between UE and eNB in the prior art;

FIG. 2 shows a schematic flowchart of a method for establishing a connection of a D2D terminal according to an embodiment of the present invention;

FIG. 3 shows a schematic flowchart of a method for establishing a connection of a D2D terminal according to another embodiment of the present invention;

FIG. 4 shows a schematic structural diagram of a first UE according to an embodiment of the present invention;

FIG. 5 shows a schematic structural diagram of a second UE according to an embodiment of the present invention;

FIG. 6 shows a schematic structural diagram of a second UE according to an embodiment of the present invention;

Fig. 7 shows a schematic structural diagram of a base station according to an embodiment of the present invention.

detailed description

The method, system and device for establishing a connection of a D2D terminal will be described in detail below.

Fig. 2 shows a schematic flowchart of a method for establishing a connection of a D2D terminal according to an embodiment of the present invention.

Referring to FIG. 2, it can be seen that the first UE of the calling user equipment needs to establish a D2D connection with the second UE of the called user equipment, and the following steps are performed:

Step 201: the first user equipment UE sends a preamble to the base station;

Step 202: the base station sends a random access response RA response message to the first UE after receiving the preamble sent by the first UE, whereby the first UE receives the random access response message sent by the base station in response to the preamble . Wherein, the message may carry a timing advance TA value and/or a transmission power value for the first UE, so as to be used by the first UE to access the base station.

Step 203: the first UE sends a second UE identifier to the base station, and the second UE is a D2D communication target of the first UE, that is, the first UE wants to establish a D2D communication with the second UE. The second UE identity may be, for example, a Temporary Mobile Subscriber Identity (S-TMSI) or other identity of the second UE. The first UE may obtain the identity of the second UE by detecting the second UE, or may use the user number of the second UE. The first UE may send an RRC connection establishment request message to the base station, where the RRC connection establishment request message carries the identity of the second UE.

Step 204: The base station sends the D2D link configuration parameters and RRC connection configuration parameters of the first UE to the first UE in response to the second UE identity, so that the first UE receives the information returned by the base station in response to the second UE identity. D2D link configuration parameters and RRC connection configuration parameters of the first UE, where the D2D link configuration parameters are used for the D2D connection between the first UE and the second UE. Specifically, the D2D link configuration parameters and the RRC connection configuration parameters include Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Media Access Control (MAC) layer, and each layer of the physical (PHY) layer. Static or semi-static parameter configuration. Here, the base station may send an RRC connection establishment message to the first UE, and the RRC connection establishment message carries the D2D link configuration parameters of the first UE returned by the base station in response to the identity of the second UE. It is also possible that the base station scrambles the physical downlink control channel (PDCCH) through the D2D cell radio network temporary identifier (D2D-C-RNTI) to send the scheduling of the D2D link configuration parameters and the RRC connection configuration parameters of the first UE to the first UE. Information, so that the first UE uses the D2D-C-RNTI to descramble the physical downlink control channel PDCCH to obtain the scheduling information of the first UE's D2D link configuration parameters and RRC connection configuration parameters sent by the base station, and further obtain the scheduling information according to the scheduling information. The D2D link configuration parameters and RRC connection configuration parameters of the first UE are described above. It should be noted that, in the case of using the D2D-C-RNTI to transmit scheduling information, the first UE needs to obtain the D2D-C-RNTI allocated by the base station first. To this end, the first UE can obtain the D2D-C-RNTI through the RA response message or contention resolution message sent by the base station, where the D2D-C-RNTI is carried in the above RA response message or contention resolution message, or the first UE can also Receive the D2D-C-RNTI allocation message directly sent by the base station.

Step 205: The base station sends a paging message to the second UE, the paging message is used to indicate the D2D link configuration parameters and RRC connection configuration parameters of the second UE, and the paging message may also carry the time for the second UE Advance TA value and/or transmit power value, or may indicate that the first UE and the second UE share the time advance TA value and/or transmit power value, so that the second UE will share the TA value and/or transmit power value with the first UE The transmit power value is used as the TA value and/or transmit power value of the second UE, so as to connect the second UE to the base station. In addition, the paging message also includes the S-TMSI of the second UE and a Cell-Radio Network Temporary Identity (C-RNTI) allocated for the second UE. Therefore, the second UE correspondingly receives a paging message from the base station, and obtains the D2D link configuration parameter and the RRC connection configuration parameter of the second UE based on the paging message, wherein the D2D link configuration parameter is used for the second UE. A D2D connection between the second UE and the first UE. The D2D link configuration parameters and RRC connection configuration parameters of the second UE may be carried in the paging message sent by the base station to the second UE. It is also possible that after the second UE receives the paging message from the base station and determines to allow D2D After the communication, a paging response message is sent to confirm that D2D communication can be performed, and then the base station sends the D2D link configuration parameters and RRC connection configuration parameters of the second UE to the second UE through another message. In addition, it is also possible that the base station sends the scheduling information of the second UE's D2D link configuration parameters and RRC connection configuration parameters to the second UE through the D2D-C-RNTI scrambled physical downlink control channel (PDCCH), so that the second UE uses D2D-C-RNTI descrambles the physical downlink control channel PDCCH to obtain the scheduling information of the D2D link configuration parameters and RRC connection configuration parameters of the second UE sent by the base station, and further obtains the D2D link of the second UE according to the scheduling information Road configuration parameters and RRC connection configuration parameters. The second UE can also use the D2D-C-RNTI to acquire the TA value and/or the transmit power value. It should be noted that, in the case of using the D2D-C-RNTI to transmit the scheduling information, the second UE needs to acquire the D2D-C-RNTI allocated by the base station first. To this end, the second UE receives the D2D-C-RNTI allocation message sent by the base station. The D2D-C-RNTI allocation message can be carried in the above paging message sent by the base station to the second UE, or can be sent in a separate message. .

Before the base station sends the paging message to the second UE, it may also include that the base station allocates an uplink grant UL grant to the second UE according to the C-RNTI of the second UE, and the UL grant may be included in the paging message sent by the base station. sent to the second UE, or may be sent by the base station to the second UE as a separate message.

Step 206: the first UE establishes a D2D connection with the second UE, and completes establishment of an RRC connection with the base station based on respective RRC connection configuration parameters. Since the first UE obtains its D2D link configuration parameters through step 204 and the second UE obtains its D2D link configuration parameters through step 205, the first UE and the second UE can establish a D2D connection between each other. After the connection is established, the first UE and the second UE may respectively send an RRC connection establishment complete message and a D2D connection configuration complete message to the base station.

In this embodiment, the TA value and/or transmit power value of the second UE may be the TA value and/or transmit power value shared with the first UE. There may be multiple ways to determine whether the first UE shares the TA value and/or the transmit power value with the second UE. One way is that before step 201, the first UE detects the second UE to obtain the path loss or distance between the first UE and the second UE, and also obtains the identity of the second UE, and the first UE detects the second UE according to the path loss or distance The distance determines that the second UE can share the TA value and/or transmit power value with the first UE. At this time, the first UE may send the indication information indicating that the first UE and the second UE share the timing advance value TA value and/or transmit power value and the second UE identity to the base station through the RRC connection establishment request message, so that the base station The shared TA value and/or transmit power value can be sent to the second UE. Another way is that before step 201, the first UE detects the second UE to obtain the path loss or distance between the first UE and the second UE, and also obtains the identity of the second UE. Subsequently, the first UE reports the path loss or distance and the identity of the second UE to the base station, so that the base station can determine whether the second UE can share the TA value and/or transmit power value with the first UE. When the base station determines that the second UE can share the TA value and/or transmit power value with the first UE, the base station sends the shared TA value and/or transmit power value to the second UE.

In this embodiment, when the first UE and the second UE listen to the PDCCH through the D2D-C-RNTI allocated by the base station to obtain scheduling information, and receive the scheduling information for the first UE and the second UE according to the scheduling information When one or more items of RRC connection configuration parameters, D2D link configuration parameters, and TA value and/or transmit power value information for the second UE are used, the method for monitoring and sending PDCCH using D2D-C-RNTI is specific as follows:

Both the first UE and the second UE use the D2D-C-RNTI to monitor, the base station uses the D2D-C-RNTI to send the PDCCH, and the following new indication information is added to the PDCCH:

00 indicates that both UEs need to receive downlink DL-SCH resources from the base station;

10 indicates that the primary UE of the Ud link sends, and the secondary UE monitors;

01 indicates that the primary UE of the Ud link receives and the secondary UE transmits;

11 Reserved (or indicates that both UEs need to send uplink UL-SCH resource information to the base station, and the resources can be divided into two parts for use by the two UEs respectively).

The above only takes two UEs as an example. If the number of UEs exceeds two, more bit information may be used to indicate the sending and receiving operations of each UE. That is, the PDCCH scheduling information of the D2D UE sent by the base station using D2D-C-RNTI scrambling includes the following information:

The sending and receiving status indication information of each UE in the currently scheduled time unit;

The sending and receiving status indication information of each UE may be indicated by bits at different positions, and the position information in the indication information corresponding to each UE may be pre-configured through high-layer signaling.

In this embodiment, the base station sends their respective D2D link configuration parameters to the first UE and the second UE respectively. It can be seen that in the process of establishing D2D communication between the first UE and the second UE, only the random access process between the first UE and the base station is required, and the second UE and the base station do not need to repeatedly perform random access, thereby reducing the number of D2D connections. Establishment delay. In addition, because the S-TMSI is unique within the scope of the TA and unique within the scope of the base station, there is no need for the base station to notify the mobility management entity (MME) that it will perform the second UE in the process of paging the second UE. The paging of the two UEs avoids the impact of the paging process on the core network, thereby further reducing the delay in establishing the D2D connection. However, the present invention does not limit whether the base station performs paging through the MME.

In addition, during the communication process, the first UE or the second UE may periodically or event-triggered detect the path loss or distance between the first UE and the second UE, after the first UE and the second UE establish a connection with the network, the subsequent The base station may separately maintain TA updates of the first UE and the second UE, that is, send TA commands to the first UE and the second UE separately. It can also be decided to use a TA command to update according to the distance information reported regularly or event-triggered by the UE. If a TA command is used, then both the first UE and the second UE uniformly use the point-to-point cell wireless network temporary identity (D2D -C-RNTI) Obtain the scheduling information of the TA command, and then update it according to the obtained TA command.

Fig. 3 shows a schematic flowchart of a method for establishing a connection of a D2D terminal according to another embodiment of the present invention.

Referring to FIG. 3, it can be seen that the first UE of the calling user equipment needs to establish a D2D connection with the second UE of the called user equipment, and the following steps are performed:

Step 301: the first user equipment UE sends a preamble to the base station;

Step 302: the base station sends a random access response RA response message to the first UE after receiving the preamble sent by the first UE, whereby the first UE receives the random access response message sent by the base station in response to the preamble . Wherein, the message may carry a timing advance TA value and/or a transmission power value for the first UE, so as to be used by the first UE to access the base station.

Step 303: the first UE sends a second UE identifier to the base station, and the second UE is a D2D communication target of the first UE, that is, the first UE wants to establish a D2D communication with the second UE. The second UE identity may be, for example, a Temporary Mobile Subscriber Identity (S-TMSI) or other identity of the second UE. Here, the first UE may send an RRC connection establishment request message to the base station, where the RRC connection establishment request message carries the identity of the second UE.

The above steps 301-303 correspond to steps 201-203 in FIG. 2 .

Step 304: The base station sends the D2D link configuration parameters and the RRC connection configuration parameters between the first UE and the second UE to the first UE in response to the second UE identity, and also transmits the TA value and/or transmission of the second UE The power value information is sent to the first UE. It is also possible that the first UE and the second UE share the TA value and/or the transmission power value, and at this time, the base station sends to the first UE indication information that the second UE shares the TA value and/or the transmission power value with the first UE. Here, the base station may send an RRC connection establishment message to the first UE, and the RRC connection establishment message carries the D2D link configuration parameters and RRC connection configuration parameters between the first UE and the second UE, as well as the TA value and the RRC connection configuration parameters of the second UE. /or transmit power value information or indication information that the second UE shares the TA value and/or transmit power value with the first UE. It is also possible that the base station sends the scheduling information of the above information to the first UE by scrambling the physical downlink control channel (PDCCH) through the D2D-C-RNTI, so that the first UE uses the D2D-C-RNTI to descramble the physical downlink control channel (PDCCH) to obtain Scheduling information, and further obtain the above information according to the scheduling information. Likewise, in the case of using the D2D-C-RNTI to transmit scheduling information, the first UE needs to acquire the D2D-C-RNTI allocated by the base station first. For a specific description on this, reference may be made to the embodiment described above in conjunction with FIG. 2 , which will not be repeated here.

Since many configurations of the first UE and the second UE are the same, the configuration information of the first UE and the second UE may use Delta configuration to save message resources. In the embodiment of the present invention, the Delta configuration means that the same configuration information appears only once, thereby saving message resources.

Step 305: The first UE sends the second UE's D2D link configuration parameters and RRC connection configuration parameters, and the second UE's TA value and/or transmit power value information to the second UE, or sends the second UE D2D link configuration parameters and RRC connection configuration parameters, and shared TA value and/or transmit power value. Thus, the second UE correspondingly receives the D2D link configuration parameter, the RRC connection configuration parameter and the TA value and/or transmission power value of the second UE sent by the first UE. It is also possible here that the first UE sends the D2D cell radio network temporary identifier D2D-C-RNTI to the second UE, and the D2D-C-RNTI is used for the second UE to obtain the scheduling of the second UE from the physical downlink control channel PDCCH Information, so that the second UE can use the D2D-C-RNTI to descramble the physical downlink control channel PDCCH to obtain the scheduling information sent by the base station, and further obtain the above information of the second UE according to the scheduling information.

Step 306: The first UE establishes a D2D connection with the second UE, and completes the establishment of the RRC connection with the base station based on the RRC connection configuration parameters of the first UE, and the second UE establishes a D2D connection with the first UE, and based on The RRC connection configuration parameters of the second UE complete the establishment of the RRC connection with the base station. Since the first UE obtains its D2D link configuration parameters through step 304 and the second UE obtains its D2D link configuration parameters through step 305, the first UE and the second UE can establish a D2D connection between each other.

After the second UE completes the configuration, it can feed back to the first UE that the establishment of the Uu RRC connection (that is, the RRC connection between the second UE and the base station) is complete, and the Ud D2D link (that is, the connection between the first UE and the second UE D2D link) configuration complete message. After the first UE receives the RRC connection establishment complete and D2D link configuration complete messages fed back by the second UE, the first UE may send the RRC connection establishment complete message and the D2D configuration complete message to the base station in a unified manner.

In this embodiment, the TA value and/or transmit power value of the second UE may be the TA value and/or transmit power value shared with the first UE. Likewise, there may be multiple ways to determine whether the first UE shares the TA value and/or the transmit power value with the second UE. Regarding this content, reference may be made to the embodiment described above in conjunction with FIG. 2 , which will not be repeated here.

The TA value updating process in this embodiment is the same as that in the embodiment shown in FIG. 2 , and will not be repeated here.

In this embodiment, in the process of establishing D2D communication between the first UE and the second UE, only the random access process between the first UE and the base station is required, and the second UE and the base station do not need to perform random access repeatedly, thereby reducing the Delay in establishing a D2D connection.

In the above-mentioned embodiments, if the first UE has established a connection with the base station before initiating a D2D communication request with the second UE, that is, the first UE is currently in a connected state, then only the first UE needs to send a communication with the second UE to the base station. D2D communication request message of the UE, the request message includes: the identity of the second UE, such as S-TMSI or user number, the TA value and/or transmit power value shared by the first UE and the second UE, or the first UE and the second UE The indication value information of the TA value and/or transmit power value shared by the second UE, or the request message includes: the identity of the second UE, such as S-TMSI or user number, the communication between the first UE and the second UE Path loss or distance.

If the second UE that the first UE requests to establish D2D communication has already established a connection with the base station, that is, the second UE is currently in a connected state, the base station can omit the step of paging the second UE, and the base station only needs to send the D2D communication to the second UE. The connection establishment request only needs to inquire whether the second UE is allowed to establish D2D communication with the first UE. Or the base station may determine whether to allow the first UE to perform D2D communication with the second UE, and if so, notify the second UE to establish D2D communication with the first UE.

The present invention also provides embodiments of the corresponding user equipment, base station and communication system.

According to an embodiment of the present invention, a first user equipment UE is provided. Fig. 4 shows a schematic structural diagram of a first UE according to an embodiment of the present invention. It can be seen that the first UE 40 includes: a first sending device 401, configured to send a preamble to the base station, and used to send a second UE identity to the base station, and the second UE is a D2D communication target of the first UE; The first receiving means 402 is configured to receive the random access response message sent by the base station in response to the preamble, and to receive the D2D link configuration parameter and the D2D link configuration parameter of the first UE returned by the base station in response to the second UE identifier RRC connection configuration parameters; and first connection establishing means 403, configured to establish a D2D connection with the second UE based on the D2D link configuration parameters of the first UE, and complete RRC with the base station based on the RRC connection configuration parameters The connection is established.

According to an embodiment, the first user equipment further includes: a first sharing determination means 404, configured to detect the second UE to obtain the path loss or distance between the first UE and the second UE, and according to the path loss or distance Determine whether the second UE can share the TA value and/or transmit power value with the first UE; or the first sending means 401 is used to report to the base station for determining whether the second UE can share the TA value and/or the first UE Or the path loss or distance of the transmit power value.

According to an embodiment, the first receiving means 402 is further configured to receive an RRC connection establishment message from the base station, the RRC connection establishment message carrying the first UE's information returned by the base station in response to the second UE identifier D2D link configuration parameters.

According to an embodiment, the RRC connection establishment message further carries: D2D link configuration parameters of the second UE, and TA value and/or transmit power value information of the second UE; the first sending means 401 is also used to Sending the D2D link configuration parameters of the second UE, and the TA value and/or transmit power value information of the second UE to the second UE.

According to an embodiment, the RRC connection establishment message further carries: D2D link configuration parameters of the second UE, and indication information that the second UE shares a TA value and/or transmit power value with the first UE; The sending unit 401 is further configured to send the D2D link configuration parameters of the second UE, and the shared TA value and/or transmit power value to the second UE.

According to an embodiment, the first user equipment further includes: a first temporary identifier obtaining means 405, configured to obtain a D2D cell radio network temporary identifier D2D-C-RNTI assigned by the base station, and the D2D-C-RNTI is used for the first UE Obtain the scheduling information of the first UE and the second UE from the physical downlink control channel PDCCH with the second UE; and the first receiving device 402 is used to use the D2D-C-RNTI to descramble the physical downlink control channel PDCCH to obtain the base station transmission The scheduling information of the D2D link configuration parameters of the first UE, and further obtain the D2D link configuration parameters of the first UE according to the scheduling information.

According to an embodiment of the present invention, a second user equipment UE is provided. Fig. 5 shows a schematic structural diagram of a second UE according to an embodiment of the present invention. It can be seen that the second user equipment UE 50 includes: second receiving means 502, configured to receive a paging message from the base station, and obtain the D2D link configuration parameters of the second UE based on the paging message; the second connection establishment The means 503 is configured to establish a D2D connection with the first UE based on the D2D link configuration parameters of the second UE.

According to an embodiment, the second user equipment further includes: a second temporary identifier obtaining module 505, configured to obtain the D2D cell radio network temporary identifier D2D-C-RNTI carried in the paging message, and the D2D-C-RNTI is used for the first A UE and a second UE obtain the scheduling information of the first UE and the second UE from the physical downlink control channel PDCCH; and the second receiving device 502 is configured to use the D2D-C-RNTI to descramble the physical downlink control channel PDCCH acquisition The base station sends the scheduling information of the D2D link configuration parameters of the second UE, and further acquires the D2D link configuration parameters of the second UE according to the scheduling information.

According to an embodiment of the present invention, a second user equipment UE is provided. Fig. 6 shows a schematic structural diagram of a second UE according to an embodiment of the present invention. It can be seen that the second user equipment UE 60 includes: third receiving means 602, configured to receive the D2D link configuration parameters and RRC connection configuration parameters of the second UE from the base station and forwarded by the first UE; third connection establishing means 603, It is used for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE, and completing establishment of the RRC connection with the base station based on the RRC connection configuration parameters.

According to an implementation manner, the third receiving means 602 is further configured to acquire a timing advance TA value and/or a transmit power value of the second UE from the first UE.

According to an embodiment, the second user equipment UE further includes: a third temporary identifier obtaining module 605, configured to receive a D2D cell radio network temporary identifier D2D-C-RNTI from the first UE, and the D2D-C-RNTI is used for the first UE A UE and a second UE acquire scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH.

According to an embodiment of the present invention, a base station is provided. Fig. 7 shows a schematic structural diagram of a base station according to an embodiment of the present invention. It can be seen that the base station 70 includes: a fourth receiving means 702, configured to receive a preamble from the first UE, and to receive a second UE identity from the first user equipment UE; a fourth sending means 701, configured to respond to the The preamble sends a random access response message to the first UE, and is used to send a D2D link configuration parameter of the first UE to the first UE based on the second UE identifier, where the D2D link configuration parameter of the first UE is used In the D2D connection between the first UE and the second UE.

According to an embodiment, the fourth sending module 701 further sends a paging message to the second UE, where the paging message is used to indicate the D2D link configuration parameters of the second UE.

According to an embodiment, the base station 70 further includes a scrambling device 703, configured to scramble the physical downlink control channel PDCCH to send the first UE and the second Scheduling information of the UE's D2D link configuration parameters.

In addition, an embodiment of the present invention also provides a communication system, including the above-mentioned first user equipment, second user equipment, and base station.

In the above system embodiments and UE embodiments, the first UE is equivalent to the first UE in the corresponding method embodiment, and the second UE is equivalent to the second UE in the corresponding method embodiment, and the technical implementation details of each module are related to the corresponding method The embodiments are the same, and no further description is required.

Those skilled in the art should understand that the division of device modules in the embodiments of the present invention is divided into functions, and the actual specific structure may be the splitting or merging of the above functional modules.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The solutions described in the claims are also the scope of protection of the embodiments of the present invention.

Those skilled in the art can understand that all or part of the processing in the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (27)

1. A method for establishing a connection from a device to a device D2D terminal, comprising:

the first user equipment UE sends a preamble to a base station;

the first UE receives a random access response message sent by the base station in response to the preamble;

the first UE sends a second UE identity to the base station, wherein the second UE is a D2D communication target of the first UE;

the first UE receives the D2D link configuration parameters and the RRC connection configuration parameters of the first UE, which are returned by the base station in response to the second UE identification;

the first UE establishes a D2D connection with the second UE based on the D2D link configuration parameters of the first UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters;

the first UE sending the second UE identity to the base station includes: the first UE sends an RRC connection establishment request message to the base station, wherein the RRC connection establishment request message carries the second UE identification;

the method further comprises the following steps:

the first UE detects the second UE to acquire the path loss or the distance between the first UE and the second UE;

the first UE determines that the second UE can share a TA value and/or a transmission power value with the first UE according to the path loss or the distance; the RRC connection establishment request message further carries indication information indicating that the first UE and the second UE share a timing advance TA value and/or a transmission power value; or

The first UE reports to the base station said path loss or distance for determining whether the second UE is able to share the TA value and/or the transmit power value with the first UE.

2. The method of claim 1, wherein the receiving, by the base station, the returned D2D link configuration parameters for the first UE in response to the second UE identification comprises:

and receiving an RRC connection establishment message from a base station, wherein the RRC connection establishment message carries the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identification.

3. The method of claim 2, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and TA value and/or transmission power value information of the second UE;

the method further comprises the following steps:

the first UE sends the D2D link configuration parameters of the second UE and the TA value and/or the transmission power value information of the second UE to the second UE.

4. The method of claim 3, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and indication information that the second UE shares a TA value and/or a transmission power value with the first UE;

the method further comprises the following steps:

the first UE sends the second UE's D2D link configuration parameters, along with the shared TA value and/or transmit power value, to the second UE.

5. The method of any one of claims 1-4, further comprising:

the method comprises the steps that a first UE obtains a D2D cell radio network temporary identifier D2D-C-RNTI allocated by a base station, and the D2D-C-RNTI is used for the first UE and a second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH;

the receiving the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identity comprises:

the first UE uses the D2D-C-RNTI to descramble a physical downlink control channel PDCCH to obtain scheduling information of the D2D link configuration parameters of the first UE sent by the base station, and further obtains the D2D link configuration parameters of the first UE according to the scheduling information.

6. The method of claim 5, wherein the first UE obtaining the base station allocated D2D cell radio network temporary identity D2D-C-RNTI comprises: and the first UE acquires the D2D-C-RNTI carried in the random access response message.

7. A method for establishing a connection from a device to a device D2D terminal, comprising:

the second User Equipment (UE) receives a paging message from the base station and acquires the D2D link configuration parameters of the second UE based on the paging message;

the second UE establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE;

the paging message also carries a TA value and/or a transmission power value of the second UE; or

The paging message further indicates that the first UE and the second UE share a Timing Advance (TA) value and/or a transmission power value, and the method further includes: the second UE uses the TA value and/or the transmission power value shared with the first UE as the TA value and/or the transmission power value of the second UE.

8. The method of claim 7, wherein the obtaining the D2D link configuration parameters for the second UE based on the paging message comprises:

and acquiring the D2D link configuration parameters of the second UE carried by the paging message.

9. The method of claim 7, wherein the obtaining the D2D link configuration parameters for the second UE based on the paging message comprises:

acquiring a D2D cell radio network temporary identifier D2D-C-RNTI carried by a paging message, wherein the D2D-C-RNTI is used for acquiring scheduling information of first UE and second UE from a Physical Downlink Control Channel (PDCCH) by the first UE and the second UE;

and descrambling a Physical Downlink Control Channel (PDCCH) by using the D2D-C-RNTI to obtain scheduling information of the D2D link configuration parameters of the second UE sent by the base station, and further obtaining the D2D link configuration parameters of the second UE according to the scheduling information.

10. A method for establishing a connection from a device to a device D2D terminal, comprising:

the second User Equipment (UE) receives the D2D link configuration parameters and the RRC connection configuration parameters of the second UE, which are forwarded by the first UE from the base station;

the second UE establishes a D2D connection with the first UE based on the D2D link configuration parameters of the second UE and completes the RRC connection establishment with the base station based on the RRC connection configuration parameters;

the method further comprises the following steps: and the second UE acquires the TA value and/or the transmission power value of the second UE from the first UE.

11. The method of claim 10, further comprising:

and the second UE receives the D2D cell radio network temporary identifier D2D-C-RNTI from the first UE, wherein the D2D-C-RNTI is used for the first UE and the second UE to acquire scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH.

12. A method for establishing a connection from a device to a device D2D terminal, comprising:

receiving a preamble from a first UE;

responding to the preamble and sending a random access response message to the first UE;

receiving a second UE identity from a first User Equipment (UE);

transmitting, to a first UE, D2D link configuration parameters of the first UE based on the second UE identity, the D2D link configuration parameters of the first UE for D2D connectivity of the first UE with the second UE;

the receiving the second UE identity from the first UE comprises:

receiving an RRC connection establishment request message from a first UE, wherein the RRC connection establishment request message carries the second UE identification;

the RRC connection establishment request message also carries path loss or distance between the first UE and the second UE, or indication information indicating that the first UE and the second UE share a timing advance TA value and/or a transmission power value.

13. The method of claim 12, wherein sending the D2D link configuration parameters for the first UE to the first UE comprises:

sending an RRC connection establishment message to the first UE, wherein the RRC connection establishment message carries the D2D link configuration parameters of the first UE.

14. The method of claim 12 or 13, further comprising:

and sending a paging message to the second UE, wherein the paging message is used for indicating the D2D link configuration parameters of the second UE.

15. The method of claim 14, wherein the paging message carries the D2D link configuration parameter of the second UE, and a TA value and/or a transmit power value of the second UE.

16. The method of claim 14, in which the paging message further indicates that the first UE and the second UE share a time advance, TA, value and/or a transmit power value.

17. The method of claim 12, wherein the sending the D2D link configuration parameters for the first UE to the first UE comprises: and sending scheduling information of the D2D link configuration parameters of the first UE and the second UE to the first UE and the second UE by scrambling a physical downlink control channel PDCCH through a D2D cell radio network temporary identifier D2D-C-RNTI.

18. A first User Equipment (UE), comprising:

the first sending device is used for sending a preamble to a base station and sending a second UE identity to the base station, wherein the second UE is a D2D communication target of the first UE;

a first receiving device, configured to receive a random access response message sent by the base station in response to the preamble, and configured to receive a D2D link configuration parameter and an RRC connection configuration parameter of the first UE, which are returned by the base station in response to the second UE identity; and

first connection establishing means for establishing a D2D connection with the second UE based on the D2D link configuration parameters of the first UE and completing RRC connection establishment with a base station based on the RRC connection configuration parameters;

the first receiving means is further for:

receiving an RRC connection establishment message from a base station, wherein the RRC connection establishment message carries the D2D link configuration parameters of the first UE returned by the base station in response to the second UE identification;

the device further comprises:

the first sharing determination device is used for detecting the second UE to acquire the path loss or the distance between the first UE and the second UE, and determining whether the second UE can share the TA value and/or the transmission power value with the first UE according to the path loss or the distance; or

The first transmitting means is for reporting the path loss or distance for determining whether the second UE is capable of sharing the TA value and/or the transmit power value with the first UE to the base station.

19. The first user equipment of claim 18, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and TA value and/or transmission power value information of the second UE;

the first sending device is further configured to send, to the second UE, the D2D link configuration parameter of the second UE, and the TA value and/or the transmission power value information of the second UE.

20. The first user equipment of claim 18, wherein the RRC connection setup message further carries: D2D link configuration parameters of the second UE, and indication information that the second UE shares a TA value and/or a transmission power value with the first UE;

the first transmitting device is further configured to transmit, to the second UE, the D2D link configuration parameter of the second UE, and the shared TA value and/or the transmit power value.

21. The first user device of claim 18 or 19, further comprising:

the first temporary identifier obtaining device is used for obtaining a D2D cell radio network temporary identifier D2D-C-RNTI allocated by a base station, and the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH; and is

The first receiving device is configured to use the D2D-C-RNTI to descramble the PDCCH, which is a physical downlink control channel, to obtain scheduling information of the D2D link configuration parameters of the first UE sent by the base station, and further obtain the D2D link configuration parameters of the first UE according to the scheduling information.

22. A second user equipment, UE, comprising:

the second receiving device is used for receiving the paging message from the base station and acquiring the D2D link configuration parameters of the second UE based on the paging message;

second connection establishing means for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE;

wherein,

the paging message also carries a TA value and/or a transmission power value of the second UE; or

And if the paging message further indicates that the first UE and the second UE share the TA value and/or the transmission power value, the TA value and/or the transmission power value shared with the first UE are/is used as the TA value and/or the transmission power value of the second UE.

23. The second user device of claim 22, further comprising:

a second temporary identifier obtaining device, configured to obtain a D2D cell radio network temporary identifier D2D-C-RNTI carried in the paging message, where the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH; and is

The second receiving device is configured to use the D2D-C-RNTI to descramble the PDCCH, to obtain scheduling information of the D2D link configuration parameters of the second UE sent by the base station, and further obtain the D2D link configuration parameters of the second UE according to the scheduling information.

24. A second user device, comprising:

third receiving means, configured to receive the D2D link configuration parameter and the RRC connection configuration parameter of the second UE forwarded by the first UE from the base station;

third connection establishing means for establishing a D2D connection with the first UE based on the D2D link configuration parameters of the second UE and completing RRC connection establishment with a base station based on the RRC connection configuration parameters;

the third receiving device is further configured to obtain a timing advance TA value and/or a transmission power value of the second UE from the first UE.

25. The second user device of claim 24, further comprising:

and a third temporary identifier obtaining device, configured to receive a D2D cell radio network temporary identifier D2D-C-RNTI from the first UE, where the D2D-C-RNTI is used for the first UE and the second UE to obtain scheduling information of the first UE and the second UE from a physical downlink control channel PDCCH.

26. A base station, comprising:

a fourth receiving device, configured to receive the preamble from the first UE, and to receive the second UE identity from the first UE;

a fourth sending device, configured to send a random access response message to the first UE in response to the preamble, and send a D2D link configuration parameter of the first UE to the first UE based on the second UE identity, where the D2D link configuration parameter of the first UE is used for the D2D connection between the first UE and the second UE;

the fourth sending device also sends a paging message to the second UE, where the paging message is used to indicate the D2D link configuration parameters of the second UE;

wherein,

the receiving the second UE identity from the first UE comprises:

receiving an RRC connection establishment request message from a first UE, wherein the RRC connection establishment request message carries the second UE identification;

the RRC connection establishment request message also carries path loss or distance between the first UE and the second UE, or indication information indicating that the first UE and the second UE share a timing advance TA value and/or a transmission power value.

27. The base station according to claim 26, further comprising scrambling means for scrambling physical downlink control channel, PDCCH, with D2D cell radio network temporary identity, D2D-C-RNTI, to send scheduling information of D2D link configuration parameters of the first and second UEs to the first and second UEs.