WO2016202227A1 - Selection and notification method and device for layer 2 link identifier - Google Patents

Selection and notification method and device for layer 2 link identifier Download PDF

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Publication number
WO2016202227A1
WO2016202227A1 PCT/CN2016/085611 CN2016085611W WO2016202227A1 WO 2016202227 A1 WO2016202227 A1 WO 2016202227A1 CN 2016085611 W CN2016085611 W CN 2016085611W WO 2016202227 A1 WO2016202227 A1 WO 2016202227A1
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Prior art keywords
layer
link identifier
communication
ues
link
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PCT/CN2016/085611
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French (fr)
Chinese (zh)
Inventor
张惠英
赵亚利
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电信科学技术研究院
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Publication of WO2016202227A1 publication Critical patent/WO2016202227A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a layer 2 link identifier selection, notification method and apparatus.
  • D2D device to device discovery
  • D2D device to device communication
  • D2D discovery and D2D communication are implemented using the PC5 interface.
  • 3GPP Rel-12 has implemented one-to-many communication on the PC5 interface.
  • the main principle is that the user equipment (User Equipment, UE) in the group passes the source in the Media Access Control (MAC) subheader.
  • the address (SRC) identifies itself; after receiving the data packet, the receiving UE in the group first combines the destination address (DST) in the received MAC packet header with the physical layer channel scrambling code to determine the group identification information, and then determines Whether the identification information of the group is the same as the group identifier (ProSe Layer-2 Group ID) of the group.
  • the receiving is confirmed, otherwise it is discarded, thereby implementing one-to-many group communication of the PC5 interface.
  • the SRC ProSe UE ID
  • the SRC ProSe UE ID
  • the shortcoming of the prior art is also that there is no scheme capable of performing UE identification conflict detection.
  • the invention provides a layer 2 link identifier selection, notification method and device for ensuring the uniqueness of the layer 2 link identifier used by the UE in performing D2D communication with other UEs.
  • the embodiment of the invention provides a method for selecting a layer 2 link identifier, including:
  • the used layer 2 link identifier group Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, where the used layer 2 link identifier group is other UEs and UEs other than the UE performing D2D communication with other UEs The layer 2 link identifier used;
  • Link identification including:
  • the used layer 2 link identifier When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the information carrying the layer 2 link identification is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • An embodiment of the present invention provides a method for notifying a layer 2 link identifier, including:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the information carrying the layer 2 link identification is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • An embodiment of the present invention provides a layer 2 link identifier selection apparatus, including:
  • a receiving module configured to receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier
  • a determining module configured to determine, according to a layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is another UE and performs D2D communication with other UEs a layer 2 link identifier used by a UE other than the UE;
  • a selection module configured to select, according to the used layer 2 link identifier group, a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 chain for performing D2D communication between the UE and other UEs Road sign.
  • the selection module is further used to:
  • the used layer 2 link identifier When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the changed layer 2 link identifier as the layer 2 link identifier of the UE line D2D communication.
  • the determining module is further configured to determine a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE. ;
  • the method further includes: a broadcast module, configured to broadcast information carrying the layer 2 link identifier.
  • the information carrying the layer 2 link identification is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • An embodiment of the present invention provides a layer 2 link identifier notification apparatus, including:
  • a determining module configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
  • the broadcast module is configured to broadcast information carrying the layer 2 link identifier.
  • the information carrying the layer 2 link identification is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • An embodiment of the present invention provides a UE, including:
  • a processor for reading a program in the memory performing the following process:
  • the used layer 2 link identifier group Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, where the used layer 2 link identifier group is other UEs and UEs other than the UE performing D2D communication with other UEs The layer 2 link identifier used;
  • a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs;
  • the transceiver is used to send and receive data under the control of the processor, and performs the following processes:
  • Receiving information carried by other UEs carrying the layer 2 link identifier Receiving information carried by other UEs carrying the layer 2 link identifier.
  • the processor is used to:
  • the used layer 2 link identifier When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  • the processor is further configured to:
  • the transceiver is further used to:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the information carrying the layer 2 link identification is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • This embodiment provides another UE, including:
  • a processor for reading a program in the memory performing the following process:
  • a transceiver for transmitting data under the control of a processor performing the following processes:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the information carrying the layer 2 link identification is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • each UE broadcasts the layer 2 link identifier used by the UE to perform D2D communication with other UEs, and performs D2D communication with the UE.
  • each UE receives the information of the layer 2 link identifier broadcasted by other UEs, and selects the layer 2 chain other than the used layer 2 link identifier group according to the selection.
  • the road identifier is used as a layer 2 link identifier for D2D communication between the UE and other UEs.
  • the UE identification conflict detection scheme provides a solution for the one-to-one communication of the access layer on the basis of the existing D2D communication mechanism, and ensures the layer 2 link identifier used by the UE in performing D2D communication with other UEs. Uniqueness avoids the problem of data transmission and reception errors caused by multiple UEs using the same UE identity.
  • FIG. 1 is a schematic structural diagram of a D2D discovery/communication according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a SL-SCH MAC subheader according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a scenario in which a UE identity conflict occurs in a one-to-one communication of a PC5 interface according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of an implementation method of a notification method for a layer 2 link identifier according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart of implementing a method for selecting a link identifier of a layer 2 according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a MAC subheader corresponding to a MAC PDU according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a format of a MAC PDU according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a communication scenario for selecting a link identifier of a layer 2 before a one-to-one communication initiation according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a communication scenario in which a layer 2 link identifier conflict is found in a one-to-one communication process according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a device for selecting a link identifier of a layer 2 according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a notification device for a layer 2 link identifier according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a UE according to an embodiment of the present invention.
  • FIG. 13 is a schematic structural diagram of a second UE according to an embodiment of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • the user equipment includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular"
  • RAN Radio Access Network
  • the user equipment can be a mobile phone (or "cellular"
  • the telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.
  • D2D Device-to-device
  • D2D which is a terminal-through technology, refers to a method in which neighboring terminals can transmit data through a direct link in a short range without going through a central node (ie, a base station). Forwarding, there is no need to transmit information between UEs through a traditional cellular link.
  • FIG. 1 is a schematic diagram of a D2D discovery/communication structure. As shown in the figure, in 3GPP, the D2D proximity service technology includes the following two categories:
  • the UE uses an Evolution-Universal Terrestrial Radio Access Network (E-UTRA) to confirm that another UE is in its vicinity.
  • E-UTRA Evolution-Universal Terrestrial Radio Access Network
  • the D2D UE can use the service to find nearby taxis, find friends nearby, and the like;
  • D2D communication UEs that are close to each other, by directly establishing a link between two UEs, converting a communication link originally transmitted through the network into a local direct communication link, saving a large amount of bandwidth and network efficiency; or two UEs that are close to each other can use direct link communication to obtain stable high-speed and low-cost communication services.
  • Proximity service communication is generally performed under the control or assistance of the network side, and the evolved base station (eNB) may even dynamically allocate resources for the UE performing the proximity service communication.
  • eNB evolved base station
  • D2D link refers to the link between the device and the device for direct communication
  • D2N link A link between a device and a network node for communication.
  • UEs participating in D2D discovery/communication are divided into two roles:
  • D2D transmitting UE a UE that transmits a D2D discovery/communication message
  • the D2D receives the UE: that is, the UE that receives the discovery/communication message sent by the D2D transmitting UE.
  • FIG. 2 is a schematic diagram of a short sub-shared channel (Sidelink Shared Channel, SL-SCH) MAC subheader.
  • SL-SCH Short sub-shared Channel
  • the UE passes the MAC sub-packet in the data packet on the PC5 interface.
  • the source address (Source, SRC) and destination address (Destination, DST) carried in the header are combined with the channel scrambling code of the physical layer to determine the sender and receiver of the PC5 port data.
  • the SRC is 24 bits, and the value is equal to the ProSe User ID (ProSe UE ID) allocated by the Proximity-based Services Key Management Function.
  • the Proximity-based Services may also be referred to as ProSe.
  • the DST is 16 bits, and its value is equal to the 16 bits higher than the ProSe Layer-2 Group ID assigned by the ProSe Function, and uniquely identifies a group. If the UE is off-network, the ProSe Layer-2 Group ID uses a pre-configured value.
  • the lower 8 bits of the ProSe Layer-2 Group ID are the channel scrambling codes of the physical layer of the PC5 interface.
  • the PC5 interface implements one-to-many D2D communication based on the above manner.
  • FIG 3 is a schematic diagram of a scenario in which a UE identity conflict occurs in a one-to-one communication on a PC5 interface.
  • a UE identity conflict occurs in a one-to-one communication on a PC5 interface
  • the innermost blank area is an area where UE1 can directly perform D2D communication, that is, UE1 can establish a direct PC5 port link with UE2.
  • the dot-like area of the second layer is an area that cannot directly perform D2D communication with the UE1, but the UE located in the point area can directly perform direct D2D communication with a certain UE located in the blank area, for example, the UE3 can directly communicate with the UE2.
  • the grid-like area of the third layer is all areas outside the point area, and its characteristics It is that the UE can neither communicate directly with UE1 nor perform direct D2D communication with any UE in the blank area.
  • the UE1 In the UE identity conflict detection, the UE1 cannot collide with the UE in the blank area, nor can it collide with the UE in the point area. However, the UE1 can use the same identifier as the UE located in the grid area because UE1 and The UEs in the grid-like area do not have a common direct communication object, so there is no misjudgment of data transmission and reception between each other.
  • the SRC ProSe UE ID
  • the SRC ProSe UE ID
  • the access layer is required to provide one-to-one communication, and the UE identity is used as the source and in the one-to-one communication.
  • the destination address, the UE identifier can be globally unique (requires a long number of digits) or unique within a certain range (does not need to be too long). For a unique range, the UE needs to identify the conflict. Detected, because if a collision occurs, multiple UEs will use the same UE identity to cause data transmission and reception errors.
  • the prior art does not need to perform UE identity conflict detection, there is no scheme for performing UE identity conflict detection in the prior art.
  • a solution for detecting the UE 5 interface UE identity conflict is provided, which is used to ensure the uniqueness of the layer 2 link identifier used by the UE in performing D2D communication with other UEs, thereby avoiding the use of the same for multiple UEs.
  • the problem of data transmission and reception errors caused by the UE identity The following description will be made.
  • the UE broadcasts the layer 2 link identifier used by the UE; on the other hand, it also listens to the layer 2 link identifier used by other UEs to perform collision detection, thereby ensuring The uniqueness of the layer 2 link identifier.
  • a scheme for the UE to broadcast the layer 2 link identifier used by the UE and a scheme for monitoring the layer 2 link identifier used by other UEs for collision detection are respectively provided. It is easy to understand that the two schemes can be adopted at the same time on the same UE, or one UE can adopt only one scheme. Obviously, each UE always adopts one of the schemes, and cooperates with the UE adopting another scheme to ensure the uniqueness of the layer 2 link identifier.
  • FIG. 4 is a schematic flowchart of a method for implementing a notification method of a layer 2 link identifier, as shown in the figure, including:
  • Step 401 Determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs that perform D2D communication with the UE.
  • Step 402 Broadcast information carrying the layer 2 link identifier.
  • FIG. 5 is a schematic flowchart of a method for selecting a layer 2 link identifier, as shown in the figure, including:
  • Step 501 Receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier.
  • Step 502 Determine, according to the layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is other UEs and other UEs that perform D2D communication with other UEs.
  • Layer 2 link identifier used by the UE is other UEs and other UEs that perform D2D communication with other UEs.
  • Step 503 Select, according to the used layer 2 link identifier group, a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs.
  • the information carrying the layer 2 link identifier may be one of the following information or a combination thereof:
  • SL-BCH Direct Link Broadcast Channel
  • SL-DCH Direct Link Discovery Channel
  • SL-SCH Sidelink Shared Channel
  • RRC Radio Resource Control
  • Non-access stratum (NAS) messages carried on the PC5 interface transport channel;
  • MAC PDU MAC Protocol Data Unit
  • layer 2 identifies that the broadcast information can be carried in an RRC or NAS message on the SL-BCH or SL-DCH or SL-SCH or any other PC5 interface transport channel, or may be a MAC layer MAC PDU.
  • FIG. 6 is a schematic diagram of a MAC subheader structure corresponding to a MAC PDU
  • FIG. 7 is a schematic diagram of a MAC PDU format.
  • the MAC PDU is taken as an example, and the corresponding MAC subheader and MAC PDU format may be as shown in FIG. 6.
  • a new Logical Channel ID (LCID) can be introduced.
  • the main point of the PC5 interface UE identity conflict detection scheme in the embodiment of the present invention is that the UE that performs D2D transceiving on the PC5 interface sets its own layer 2 link identifier (ProSe) when used in conjunction with the technical solutions provided in FIG. Layer-2 ID) and the layer 2 link identity of the UE communicating with itself are broadcast to nearby UEs, and each UE listens for layer 2 links of nearby UEs for a period of time before starting to initiate one-to-one communication with other UEs.
  • the broadcast information is identified to avoid initiating one-to-one communication using the same UE layer 2 link identity as the received UE layer 2 link identity.
  • the UE needs to listen to UEs sent by other nearby UEs in addition to the UE layer 2 link identifier broadcast information (including its own layer 2 link identifier and the layer 2 link identifier of the UE communicating with itself).
  • the layer 2 link identifies the broadcast information.
  • the UE layer 2 link identifier information broadcasted by the UE that does not communicate with the UE is received, the UE layer 2 link identifier is detected. .
  • the UE After the collision is detected, the UE only needs to reselect a layer 2 link identifier that is different from all received layer 2 link identifiers, and notifies all UEs that are in one-to-one communication with itself. Further, the UE and its communication peer UE naturally need to update their layer 2 link identifier broadcast information.
  • the layer 2 link identifier other than the used layer 2 link identifier group is selected as the layer 2 link for the UE to perform D2D communication with other UEs.
  • Identification which can include:
  • the UE When the UE wants to establish D2D communication with other UEs, select the layer 2 link identifier of the used layer 2 link identifier group as the layer 2 link identifier of the D2D communication that the UE wants to establish with other UEs;
  • the used layer 2 link identifier is replaced with the used layer 2
  • the layer 2 link identifier outside the link identification group is used as the layer 2 link identifier for D2D communication with the UE.
  • the road sign may further include:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • This embodiment is used to describe the implementation process of determining the UE layer 2 link identifier when the UE (in the example, UE1) wishes to establish D2D communication with another UE (in the example, UE5). That is:
  • the layer 2 link identifiers other than the used layer 2 link identifier group are selected as the UE and other UEs.
  • a layer 2 link identifier is selected as the D2D to be established with other UEs except the used layer 2 link identifier group.
  • the layer 2 link identifier of the communication is sufficient.
  • FIG. 8 is a schematic diagram of a communication scenario in which the link identification of the layer 2 is initiated before the one-to-one communication initiation, and the meaning of the innermost blank area, the second layer of the dot area, and the third layer of the grid-like area used in the figure. Referring to Figure 3, in the environment shown in Figure 8, assume:
  • UE5 (layer 2 link identifier is L2 ID5) is performing one-to-one communication with UE2 (layer 2 link identifier is L2 ID2) and UE7 (layer 2 link identifier is L2 ID7);
  • UE2 (layer 2 link identifier is L2 ID2) is performing one-to-one communication with UE3 (layer 2 link identifier is L2 ID3) and UE5 (layer 2 link identifier is L2 ID5);
  • UE3 (layer 2 link identifier is L2 ID3) is performing one-to-one communication with UE2 (layer 2 link identifier is L2 ID2) and UE4 (layer 2 link identifier is L2 ID4);
  • UE1, UE6 and UE8 do not communicate with other UEs.
  • the layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5;
  • the layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3;
  • the layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7;
  • the layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5.
  • UE1 wants to initiate one-to-one communication with UE5, and UE1 can receive layer 2 link identification broadcast information of UE2 and UE5, so that the layer 2 link identifier that UE1 can learn is being used: L2 ID2, L2 ID3, L2 ID5, L2 ID7, then, UE1 needs to avoid selecting these 4 layer 2 link identifiers.
  • the UE1 may mark the layer 2 identifiers that have been used as unavailable according to the received layer 2 link identifier usage broadcast by the nearby UEs, and others are available, and randomly selected from the available L2 identifiers or Select an L2 identifier according to certain rules.
  • UE1 selects L2 ID4 as its own layer 2 link identifier, and establishes one-to-one communication with UE5.
  • it may further include:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the layer 2 link identification broadcast information of each subsequent UE is updated to:
  • the layer 2 link identifier broadcast information broadcast by UE1 is: L2 ID4, L2 ID5;
  • the layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5;
  • the layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3;
  • the layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5.
  • This embodiment is used to illustrate that when a certain UE (in the example, UE4) changes, for example, the layer 2 link identifier changes after the mobile, and the UE (in the example, UE1) and another UE (in the example, UE5) When there is D2D communication, when the UE (in the example, UE4) changes, the UE (in the case of UE1) layer 2 link identifier conflicts, the implementation process of the UE layer 2 link identifier is determined. That is:
  • the used layer 2 link identifier is replaced with the used layer 2
  • the layer 2 link identifier outside the link identification group is used as the layer 2 link identifier for D2D communication with the UE.
  • the UE1 changes the layer 2 link identifier that is being used, and the used layer 2 link
  • a layer 2 link identifier is selected as the layer 2 link identifier of the D2D communication established with the UE 5.
  • FIG. 9 is a schematic diagram of a communication scenario in which a layer 2 link identifier conflict is found during one-to-one communication, and the innermost blank area, the second layer of the dotted area, and the third layer of the grid-like area are used in the figure. The meaning can be referred to FIG. 3.
  • a one-to-one communication relationship is assumed to be the same as Embodiment 1.
  • UE4 moves to the point area and initiates one-to-one communication with UE2, after which the layer 2 link of each UE
  • the broadcast information is updated to:
  • the layer 2 link identifier broadcast information broadcast by UE1 is: L2 ID4, L2 ID5;
  • the layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3, L2 ID2;
  • the layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5;
  • the layer 2 link identifier broadcast information sent by the UE (UE5) that has a one-to-one communication relationship with itself includes the layer 2 link identifier used by itself.
  • the layer 2 link identification broadcast information transmitted by the UE (UE2) that does not have a one-to-one communication relationship with itself also includes the layer 2 link identifier (L2 ID4) used by itself, and thus the layer 2 chain is determined to be generated. If the path identifier conflicts, UE1 reselects a layer 2 link identifier (L2 ID1), and notifies the new layer 2 link identifier to the UE (UE5) having a one-to-one communication relationship with itself.
  • the UE that is performing D2D communication determines whether the layer 2 link identifier collision occurs by detecting the layer 2 link identifier broadcasted by other UEs, and discovers the layer 2 link identifier used by itself and the layer 2 chain used by other UEs.
  • the layer 2 link identifier used is replaced with the layer 2 link identifier of the used layer 2 link identifier group, and is used as the layer 2 link identifier of the UE for D2D communication.
  • the new layer 2 link identifier is notified to the UE with which D2D communication is performed, and the layer 2 link identifier broadcast information of the UE is updated.
  • it may further include:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the layer 2 link identification broadcast information of each subsequent UE is updated to:
  • the layer 2 link identifier broadcast information broadcast by UE1 is: L2 ID1, L2 ID5;
  • the layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
  • the layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3, L2 ID2;
  • the layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7, L2 ID1;
  • the layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5.
  • the embodiment of the present invention further provides a layer 2 link identifier selection device, and a layer 2 link identifier notification device.
  • a layer 2 link identifier selection device and a layer 2 link identifier notification device.
  • the principle of solving the problem by these devices and a layer 2 link identifier The selection method and the notification method of a layer 2 link identifier are similar. Therefore, the implementation of these devices can be referred to the implementation of the method, and the repeated description is not repeated.
  • FIG. 10 is a schematic structural diagram of a device for selecting a link identifier of a layer 2, as shown in the figure, which may include:
  • the receiving module 1001 is configured to receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier.
  • the determining module 1002 is configured to determine, according to the layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is another UE and performs D2D communication with other UEs. Layer 2 link identifier used by UEs other than the UE;
  • the selecting module 1003 is configured to select, according to the used layer 2 link identifier group, a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 for performing D2D communication between the UE and other UEs.
  • Link ID is configured to select, according to the used layer 2 link identifier group, a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 for performing D2D communication between the UE and other UEs.
  • the selection module can be further used to:
  • the used layer 2 link identifier When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  • the determining module may be further configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
  • the selection device may further include:
  • the broadcast module 1004 is configured to broadcast information carrying the layer 2 link identifier.
  • the information carrying the layer 2 link identifier may be one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • FIG. 11 is a schematic structural diagram of a notification device of a layer 2 link identifier, as shown in the figure, which may include:
  • a determining module 1101 configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
  • the broadcast module 1102 is configured to broadcast information carrying the layer 2 link identifier.
  • the information carrying the layer 2 link identifier may be one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • FIG. 12 is a schematic structural diagram of a UE. As shown in the figure, the UE includes:
  • the processor 1200 is configured to read a program in the memory 1220 and perform the following process:
  • the used layer 2 link identifier group Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, where the used layer 2 link identifier group is other UEs and UEs other than the UE performing D2D communication with other UEs The layer 2 link identifier used;
  • a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs.
  • the transceiver 1210 is configured to send and receive data under the control of the processor 1200, and performs the following processes:
  • Receiving information carried by other UEs carrying the layer 2 link identifier Receiving information carried by other UEs carrying the layer 2 link identifier.
  • the processor 1200 is configured to:
  • the used layer 2 link identifier When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  • processor 1200 can further be used to:
  • the transceiver 1210 can further be used to:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1200 and various circuits of memory represented by memory 1220.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 1210 may be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 1230 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1200 is responsible for managing the bus architecture and general processing, and the memory 1220 can store data used by the processor 1200 in performing operations.
  • FIG. 13 is a schematic diagram of a structure of a UE. As shown in the figure, the UE includes:
  • the processor 1300 is configured to read a program in the memory 1320 and perform the following process:
  • the transceiver 1310 is configured to send data under the control of the processor 1300, and performs the following process:
  • the broadcast carries the information of the layer 2 link identifier described above.
  • the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
  • a message carried on a MAC PDU of the MAC layer is a message carried on a MAC PDU of the MAC layer.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1300 and various circuits of memory represented by memory 1320.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • Transceiver 1310 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 1330 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1320 can store data used by the processor 1300 in performing operations.
  • the UE performing D2D transmission and reception on the PC5 interface broadcasts its own layer 2 link identifier and the layer 2 link identifier of the UE communicating with itself to the nearby UE. And each UE realizes the collision avoidance and resolution of the layer 2 link identifier by layer 2 link identifier collision detection in the layer 2 link identifier monitoring and communication process before the communication is initiated.
  • the following programs are included:
  • the UE performing one-to-one communication broadcasts the layer 2 link identity of itself and the UE communicating with itself.
  • the UE Before initiating one-to-one communication with other UEs, the UE first reads the layer 2 link identifier broadcast information of the nearby UE, and selects the layer 2 link identifier different from the received layer 2 link identifier.
  • the UE continues to listen to the layer 2 link identifier broadcast information of the surrounding UEs during the communication process, and when the UE layer 2 link identifier information broadcasted by the UE that does not communicate with the UE is included in the UE layer 2 link identifier, A UE layer 2 link identity conflict is detected.
  • the UE After determining that the layer 2 link identifier conflict occurs, the UE selects a new layer 2 link identifier different from all received layer 2 link identifiers, and notifies the new layer 2 link identifier to the UE that communicates with itself.
  • the UE that changes the layer 2 link identifier and the UE that communicates with it update layer 2 link identification broadcast information.
  • the UE may maintain a database of the layer 2 link identifier occupation status, update the database according to the received layer 2 link identifier broadcasted by the nearby UE, and mark the received layer 2 link identifier as unavailable, when the UE needs to generate the layer 2 When the link is identified, it can be generated from the available layer 2 link identifier.
  • the layer 2 link identifier broadcast information sent by the UE may be an RRC or NAS message carried on the SL-BCH or SL-DCH or SL-SCH or any other PC5 interface transport channel, or may be a MAC layer MAC PDU.
  • the embodiment of the invention provides a conflict avoidance and collision solution for the PC5 interface UE identifier, thereby providing a solution for the one-to-one communication of the access layer based on the existing D2D communication mechanism.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

Disclosed are a selection and notification method and device for a layer 2 link identifier. The method comprises: in a notification solution, determining a layer 2 link identifier used by the device-to-device communication between a user equipment and every other user equipment; and broadcasting information carrying the layer 2 link identifier. In a selection solution, the user equipment receiving the information carrying the layer 2 link identifiers broadcast by the other user equipments; determining a used layer 2 link identifier group according to the layer 2 link identifier carried by the various information; and selecting a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link identifier for the device-to-device communication between the current user equipment and each of other user equipments according to the used layer 2 link identifier group. The present invention can ensure the uniqueness of layer 2 link identifiers used in the device-to-device communication between a user equipment and other user equipments, preventing the problem of data reception and transmission errors caused by a plurality of user equipments using the same user equipment identifier.

Description

一种层2链路标识的选择、通知方法及装置 Layer 2 link identification selection, notification method and device
本申请要求在2015年06月19日提交中国专利局、申请号为201510346634.7、发明名称为“一种层2链路标识的选择、通知方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application filed on June 19, 2015, the Chinese Patent Office, Application No. 201510346634.7, entitled "A Layer 2 Link Identification Selection, Notification Method, and Apparatus", the entire contents of which is hereby incorporated by reference. This is incorporated herein by reference.
技术领域Technical field
本发明涉及无线通信技术领域，特别涉及一种层2链路标识的选择、通知方法及装置。The present invention relates to the field of wireless communication technologies, and in particular, to a layer 2 link identifier selection, notification method and apparatus.
背景技术Background technique
移动通信系统未来发展中，为了更好的满足用户需求，引入了D2D发现(Device to Device Discovery)机制和D2D通信(Device to Device Communication)机制。In the future development of mobile communication systems, in order to better meet the needs of users, a device to device discovery (D2D) mechanism and a device to device communication (D2D) mechanism are introduced.
D2D发现和D2D通信利用PC5接口实现。目前3GPP Rel-12已经实现了PC5接口的一对多通信，其主要原理是组内发送用户设备(User Equipment，UE)通过数据包媒体接入控制(Media Access Control，MAC)子头中的源地址(SRC)标识自己；组内接收UE在接收到数据包后，首先将接收到的数据包MAC子头中的目的地址(DST)与物理层信道扰码相结合确定组标识信息，然后判断该组标识信息是否与自己所在的组标识(ProSe Layer-2Group ID)相同，如果相同，则确认接收，否则丢弃，从而实现PC5接口的一对多组通信。在一对多通信中，用于标识UE的SRC(ProSe UE ID)是由ProSe Key Management Function分配的，且能够确保在一个组内是唯一的，因此UE不需要进行UE标识冲突检测。D2D discovery and D2D communication are implemented using the PC5 interface. Currently, 3GPP Rel-12 has implemented one-to-many communication on the PC5 interface. The main principle is that the user equipment (User Equipment, UE) in the group passes the source in the Media Access Control (MAC) subheader. The address (SRC) identifies itself; after receiving the data packet, the receiving UE in the group first combines the destination address (DST) in the received MAC packet header with the physical layer channel scrambling code to determine the group identification information, and then determines Whether the identification information of the group is the same as the group identifier (ProSe Layer-2 Group ID) of the group. If they are the same, the receiving is confirmed, otherwise it is discarded, thereby implementing one-to-many group communication of the PC5 interface. In one-to-many communication, the SRC (ProSe UE ID) used to identify the UE is allocated by the ProSe Key Management Function, and can be guaranteed to be unique within one group, so the UE does not need to perform UE identification collision detection.
现有技术的不足也在于：没有能够进行UE标识冲突检测的方案。The shortcoming of the prior art is also that there is no scheme capable of performing UE identification conflict detection.
发明内容Summary of the invention
本发明提供了一种层2链路标识的选择、通知方法及装置，用以保证UE与其他UE进行D2D通信时所使用的层2链路标识的唯一性。The invention provides a layer 2 link identifier selection, notification method and device for ensuring the uniqueness of the layer 2 link identifier used by the UE in performing D2D communication with other UEs.
本发明实施例提供了一种层2链路标识的选择方法，包括：The embodiment of the invention provides a method for selecting a layer 2 link identifier, including:
在UE上接收其他UE广播的携带有层2链路标识的信息；Receiving, by the UE, information carrying the layer 2 link identifier broadcast by other UEs;
根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的所述UE以外的UE所使用的层2链路标识；Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, where the used layer 2 link identifier group is other UEs and UEs other than the UE performing D2D communication with other UEs The layer 2 link identifier used;
根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作 为所述UE与其他各个UE进行D2D通信的层2链路标识。Selecting a layer 2 link identifier other than the used layer 2 link identifier group according to the used layer 2 link identifier group A layer 2 link identifier for D2D communication between the UE and other UEs.
在一个实施例中，根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识，包括：In an embodiment, according to the used layer 2 link identifier group, selecting a layer 2 link identifier other than the used layer 2 link identifier group as layer 2 for performing D2D communication between the UE and other UEs. Link identification, including:
在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
在一个实施例中，进一步包括：In an embodiment, further comprising:
确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
在一个实施例中，携带有层2链路标识的信息是以下信息之一或者其组合：In one embodiment, the information carrying the layer 2 link identification is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
本发明实施例提供了一种层2链路标识的通知方法，包括：An embodiment of the present invention provides a method for notifying a layer 2 link identifier, including:
确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
在一个实施例中，携带有层2链路标识的信息是以下信息之一或者其组合：In one embodiment, the information carrying the layer 2 link identification is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
本发明实施例提供了一种层2链路标识的选择装置，包括： An embodiment of the present invention provides a layer 2 link identifier selection apparatus, including:
接收模块，用于在UE上接收其他UE广播的携带有层2链路标识的信息；a receiving module, configured to receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier;
确定模块，用于根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的所述UE以外的UE所使用的层2链路标识；a determining module, configured to determine, according to a layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is another UE and performs D2D communication with other UEs a layer 2 link identifier used by a UE other than the UE;
选择模块，用于根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识。a selection module, configured to select, according to the used layer 2 link identifier group, a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 chain for performing D2D communication between the UE and other UEs Road sign.
在一个实施例中，选择模块进一步用于：In one embodiment, the selection module is further used to:
在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the changed layer 2 link identifier as the layer 2 link identifier of the UE line D2D communication.
在一个实施例中，确定模块进一步用于确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；In an embodiment, the determining module is further configured to determine a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE. ;
进一步包括：广播模块，用于广播携带有上述层2链路标识的信息。The method further includes: a broadcast module, configured to broadcast information carrying the layer 2 link identifier.
在一个实施例中，携带有层2链路标识的信息是以下信息之一或者其组合：In one embodiment, the information carrying the layer 2 link identification is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
本发明实施例提供了一种层2链路标识的通知装置，包括：An embodiment of the present invention provides a layer 2 link identifier notification apparatus, including:
确定模块，用于确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；a determining module, configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播模块，用于广播携带有上述层2链路标识的信息。The broadcast module is configured to broadcast information carrying the layer 2 link identifier.
在一个实施例中，携带有层2链路标识的信息是以下信息之一或者其组合：In one embodiment, the information carrying the layer 2 link identification is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息； An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
本发明实施例提供了一种UE，包括：An embodiment of the present invention provides a UE, including:
处理器，用于读取存储器中的程序，执行下列过程：A processor for reading a program in the memory, performing the following process:
根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的所述UE以外的UE所使用的层2链路标识；Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, where the used layer 2 link identifier group is other UEs and UEs other than the UE performing D2D communication with other UEs The layer 2 link identifier used;
根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识；Determining, according to the used layer 2 link identifier group, a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs;
收发机，用于在处理器的控制下收发数据，执行下列过程：The transceiver is used to send and receive data under the control of the processor, and performs the following processes:
接收其他UE广播的携带有层2链路标识的信息。Receiving information carried by other UEs carrying the layer 2 link identifier.
在一个实施例中，根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识时，处理器用于：In an embodiment, according to the used layer 2 link identifier group, selecting a layer 2 link identifier other than the used layer 2 link identifier group as layer 2 for performing D2D communication between the UE and other UEs. When the link is identified, the processor is used to:
在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
在一个实施例中，处理器进一步用于：In one embodiment, the processor is further configured to:
确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
收发机进一步用于：The transceiver is further used to:
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
在一个实施例中，携带有层2链路标识的信息是以下信息之一或者其组合：In one embodiment, the information carrying the layer 2 link identification is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。 A message carried on a MAC PDU of the MAC layer.
本实施例提供另一种UE，包括：This embodiment provides another UE, including:
处理器，用于读取存储器中的程序，执行下列过程：A processor for reading a program in the memory, performing the following process:
确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
收发机，用于在处理器的控制下发送数据，执行下列过程：A transceiver for transmitting data under the control of a processor, performing the following processes:
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
在一个实施例中，携带有层2链路标识的信息是以下信息之一或者其组合：In one embodiment, the information carrying the layer 2 link identification is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
本发明有益效果如下：The beneficial effects of the present invention are as follows:
本发明实施例提供的技术方案中，在层2链路标识的通知方案中，每个UE会广播UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与该UE进行D2D通信的其他UE所使用的层2链路标识。In the technical solution provided by the embodiment of the present invention, in the notification scheme of the layer 2 link identifier, each UE broadcasts the layer 2 link identifier used by the UE to perform D2D communication with other UEs, and performs D2D communication with the UE. Layer 2 link identity used by other UEs.
而在层2链路标识的选择方案中，每个UE会接收其他UE广播的携带有层2链路标识的信息；并据此选择所述已用层2链路标识组以外的层2链路标识作为UE与其他各个UE进行D2D通信的层2链路标识。In the selection scheme of the layer 2 link identifier, each UE receives the information of the layer 2 link identifier broadcasted by other UEs, and selects the layer 2 chain other than the used layer 2 link identifier group according to the selection. The road identifier is used as a layer 2 link identifier for D2D communication between the UE and other UEs.
由于UE总能通过广播获知以及告知其他可以与之进行D2D通信的UE所使用的层2链路标识，并据此选择使用不冲突的、唯一的层2链路标识，从而给出了PC5接口UE标识冲突检测的方案，在现有D2D通信机制的基础上，为接入层的一对一通信提供了解决方案，保证了UE与其他UE进行D2D通信时所使用的层2链路标识的唯一性，避免了多个UE使用相同的UE标识造成的数据收发错误的问题。Since the UE can always know by broadcast and inform other layer 2 link identifiers used by the UE with which D2D communication can be performed, and select to use the non-conflicting, unique layer 2 link identifier, thereby giving the PC5 interface. The UE identification conflict detection scheme provides a solution for the one-to-one communication of the access layer on the basis of the existing D2D communication mechanism, and ensures the layer 2 link identifier used by the UE in performing D2D communication with other UEs. Uniqueness avoids the problem of data transmission and reception errors caused by multiple UEs using the same UE identity.
附图说明DRAWINGS
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:
图1为本发明实施例中D2D发现/通信结构示意图；1 is a schematic structural diagram of a D2D discovery/communication according to an embodiment of the present invention;
图2为本发明实施例中SL-SCH MAC subheader示意图；2 is a schematic diagram of a SL-SCH MAC subheader according to an embodiment of the present invention;
图3为本发明实施例中为PC5接口一对一通信中发生UE标识冲突的场景示意图； 3 is a schematic diagram of a scenario in which a UE identity conflict occurs in a one-to-one communication of a PC5 interface according to an embodiment of the present invention;
图4为本发明实施例中层2链路标识的通知方法实施流程示意图；4 is a schematic flowchart of an implementation method of a notification method for a layer 2 link identifier according to an embodiment of the present invention;
图5为本发明实施例中层2链路标识的选择方法实施流程示意图；5 is a schematic flowchart of implementing a method for selecting a link identifier of a layer 2 according to an embodiment of the present invention;
图6为本发明实施例中MAC PDU对应的MAC subheader结构示意图；6 is a schematic structural diagram of a MAC subheader corresponding to a MAC PDU according to an embodiment of the present invention;
图7为本发明实施例中MAC PDU格式示意图；FIG. 7 is a schematic diagram of a format of a MAC PDU according to an embodiment of the present invention;
图8为本发明实施例中一对一通信发起前层2链路标识选择的通信场景示意图；FIG. 8 is a schematic diagram of a communication scenario for selecting a link identifier of a layer 2 before a one-to-one communication initiation according to an embodiment of the present invention; FIG.
图9为本发明实施例中一对一通信过程中发现层2链路标识冲突的通信场景示意图；FIG. 9 is a schematic diagram of a communication scenario in which a layer 2 link identifier conflict is found in a one-to-one communication process according to an embodiment of the present invention;
图10为本发明实施例中层2链路标识的选择装置结构示意图；10 is a schematic structural diagram of a device for selecting a link identifier of a layer 2 according to an embodiment of the present invention;
图11为本发明实施例中层2链路标识的通知装置结构示意图；11 is a schematic structural diagram of a notification device for a layer 2 link identifier according to an embodiment of the present invention;
图12为本发明实施例中UE一结构示意图；FIG. 12 is a schematic structural diagram of a UE according to an embodiment of the present invention;
图13为本发明实施例中UE二结构示意图。FIG. 13 is a schematic structural diagram of a second UE according to an embodiment of the present invention.
具体实施方式detailed description
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
应理解，本发明的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)等。It should be understood that the technical solution of the present invention can be applied to various communication systems, for example, a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, and a wideband code division. Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) System, Universal Mobile Telecommunication System (UMTS), etc.
还应理解，在本发明实施例中，用户设备(User Equipment，UE)包括但不限于移动台(Mobile Station，MS)、移动终端(Mobile Terminal)、移动电话(Mobile Telephone)、手机(handset)及便携设备(portable equipment)等，该用户设备可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，例如，用户设备可以是移动电话(或称为“蜂窝”电话)、具有无线通信功能的计算机等，用户设备还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。It should be understood that, in the embodiment of the present invention, the user equipment (User Equipment, UE) includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular" The telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.
下面结合附图对本发明的具体实施方式进行说明。Specific embodiments of the present invention will be described below with reference to the accompanying drawings.
设备到设备(Device-to-Device，D2D)，即终端直通技术，是指邻近的终端可以在近距离范围内通过直连链路进行数据传输的方式，不需要通过中心节点(即基站)进行转发，也不需要通过传统的蜂窝链路进行UE间的信息传输。 Device-to-device (D2D), which is a terminal-through technology, refers to a method in which neighboring terminals can transmit data through a direct link in a short range without going through a central node (ie, a base station). Forwarding, there is no need to transmit information between UEs through a traditional cellular link.
图1为D2D发现/通信结构示意图，如图所示，3GPP中，D2D接近服务技术包括以下两大类：FIG. 1 is a schematic diagram of a D2D discovery/communication structure. As shown in the figure, in 3GPP, the D2D proximity service technology includes the following two categories:
D2D发现：UE使用演进的全球地面无线接入网(Evolution-Universal Terrestrial Radio Access Network，E-UTRA)来确认另外一个UE在其附近。例如，D2D UE可以使用该服务来寻找附近的出租车、寻找在其附近的朋友等；D2D discovery: The UE uses an Evolution-Universal Terrestrial Radio Access Network (E-UTRA) to confirm that another UE is in its vicinity. For example, the D2D UE can use the service to find nearby taxis, find friends nearby, and the like;
D2D通信：相互接近的UE，通过在两个UE之间直接建立链路，将原本通过网络传输的通信链路转化为本地的直接通信链路，节省了大量的带宽和网络效率；或者两个相互接近的UE，可以利用直接链路通信来获得稳定高速低廉的通信服务。接近服务通信一般是在网络侧控制或者辅助下进行的，演进基站(eNB)甚至可能会为进行接近服务通信的UE动态的分配资源。D2D communication: UEs that are close to each other, by directly establishing a link between two UEs, converting a communication link originally transmitted through the network into a local direct communication link, saving a large amount of bandwidth and network efficiency; or two UEs that are close to each other can use direct link communication to obtain stable high-speed and low-cost communication services. Proximity service communication is generally performed under the control or assistance of the network side, and the evolved base station (eNB) may even dynamically allocate resources for the UE performing the proximity service communication.
为了便于描述，在本发明实施例中定义两种链路类型为：For the convenience of description, two types of links are defined in the embodiment of the present invention:
D2D链路：指设备和设备之间直接进行通信的链路；D2D link: refers to the link between the device and the device for direct communication;
D2N链路：设备和网络节点之间进行通信的链路。D2N link: A link between a device and a network node for communication.
此外，参与D2D发现/通信的UE分为两种角色：In addition, UEs participating in D2D discovery/communication are divided into two roles:
D2D发送UE：即发送D2D发现/通信消息的UE；D2D transmitting UE: a UE that transmits a D2D discovery/communication message;
D2D接收UE：即接收D2D发送UE发送的发现/通信消息的UE。The D2D receives the UE: that is, the UE that receives the discovery/communication message sent by the D2D transmitting UE.
图2为直通链路共享信道(Sidelink Shared Channel，SL-SCH)MAC子头(subheader)示意图，如图所示，在PC5接口通信的寻址过程中，UE在PC5接口通过数据包中MAC子头中携带的源地址(Source，SRC)和目的地址(Destination，DST)结合物理层的信道扰码确定PC5口数据的发送方和接收方。2 is a schematic diagram of a short sub-shared channel (Sidelink Shared Channel, SL-SCH) MAC subheader. As shown in the figure, in the addressing process of PC5 interface communication, the UE passes the MAC sub-packet in the data packet on the PC5 interface. The source address (Source, SRC) and destination address (Destination, DST) carried in the header are combined with the channel scrambling code of the physical layer to determine the sender and receiver of the PC5 port data.
其中SRC为24bits，其值等于邻近业务密钥管理功能(Proximity-based Services Key Management Function)分配的ProSe用户设备标识(ProSe UE ID)，其中，Proximity-based Services又可简称ProSe。在一个组内唯一标识一个UE。DST为16bits，其值等于ProSe Function分配的ProSe层2组标识(ProSe Layer-2Group ID)高16位，唯一标识一个组，如果UE脱网，则ProSe Layer-2Group ID使用预配置值。ProSe Layer-2Group ID的低8位即作为PC5接口的物理层的信道扰码。The SRC is 24 bits, and the value is equal to the ProSe User ID (ProSe UE ID) allocated by the Proximity-based Services Key Management Function. The Proximity-based Services may also be referred to as ProSe. Uniquely identifies a UE within a group. The DST is 16 bits, and its value is equal to the 16 bits higher than the ProSe Layer-2 Group ID assigned by the ProSe Function, and uniquely identifies a group. If the UE is off-network, the ProSe Layer-2 Group ID uses a pre-configured value. The lower 8 bits of the ProSe Layer-2 Group ID are the channel scrambling codes of the physical layer of the PC5 interface.
PC5接口基于以上方式实现一对多的D2D通信。The PC5 interface implements one-to-many D2D communication based on the above manner.
图3为PC5接口一对一通信中发生UE标识冲突的场景示意图，如图所示，在PC5接口一对一通信中发生UE标识冲突的场景中，从UE1的角度出发，说明UE标识冲突可能发生的场景。最内层的空白区域为UE1可以直接进行D2D通信的区域，也就是说UE1可以与UE2建立直接的PC5口链路。第二层的点状区域为不能与UE1直接进行D2D通信的区域，但位于点状区域的UE可以直接与位于空白区域的某个UE进行直接的D2D通信，例如UE3可以与UE2直接通信。第三层的网格状区域为点状区域外的所有区域，其特点 是其中的UE既不能与UE1直接通信，也不能与空白区域的任何UE进行直接的D2D通信。Figure 3 is a schematic diagram of a scenario in which a UE identity conflict occurs in a one-to-one communication on a PC5 interface. As shown in the figure, in a scenario where a UE identity conflict occurs in a one-to-one communication on a PC5 interface, from the perspective of UE1, the UE identity conflict may be explained. The scene that occurred. The innermost blank area is an area where UE1 can directly perform D2D communication, that is, UE1 can establish a direct PC5 port link with UE2. The dot-like area of the second layer is an area that cannot directly perform D2D communication with the UE1, but the UE located in the point area can directly perform direct D2D communication with a certain UE located in the blank area, for example, the UE3 can directly communicate with the UE2. The grid-like area of the third layer is all areas outside the point area, and its characteristics It is that the UE can neither communicate directly with UE1 nor perform direct D2D communication with any UE in the blank area.
在UE标识冲突检测中，UE1不能与位于空白区域的UE发生标识碰撞，也不能与点状区域的UE发生标识碰撞，但UE1可以与位于网格状区域的UE使用相同的标识，因为UE1与网格状区域的UE没有共同的直接通信对象，因此互相之间不会造成数据收发的误判。In the UE identity conflict detection, the UE1 cannot collide with the UE in the blank area, nor can it collide with the UE in the point area. However, the UE1 can use the same identifier as the UE located in the grid area because UE1 and The UEs in the grid-like area do not have a common direct communication object, so there is no misjudgment of data transmission and reception between each other.
也即，在一对多通信中，用于标识UE的SRC(ProSe UE ID)是由ProSe Key Management Function分配的，且能够确保在一个组内是唯一的，因此UE不需要进行UE标识冲突检测。That is, in one-to-many communication, the SRC (ProSe UE ID) used to identify the UE is allocated by the ProSe Key Management Function, and can be guaranteed to be unique within one group, so the UE does not need to perform UE identification conflict detection. .
但发明人注意到：But the inventor noticed:
随着中继(Relay)、关键任务的推动对话(Mission Critical Push To Talk，MCPTT)等功能的引入，要求接入层能提供一对一的通信，一对一通信中使用UE标识作为源和目的地址，UE标识可以是全球唯一(需要较长的位数)或在一定范围内唯一(不需要太长的位数)2种方式，针对在一定范围唯一的方式，UE就需要进行标识冲突检测了，因为如果出现冲突，会导致多个UE使用相同的UE标识造成数据收发错误。但由于现有技术并不需要进行UE标识冲突检测，所以现有技术中也就不存在进行UE标识冲突检测的方案。With the introduction of functions such as Relay and Mission Critical Push To Talk (MCPTT), the access layer is required to provide one-to-one communication, and the UE identity is used as the source and in the one-to-one communication. The destination address, the UE identifier can be globally unique (requires a long number of digits) or unique within a certain range (does not need to be too long). For a unique range, the UE needs to identify the conflict. Detected, because if a collision occurs, multiple UEs will use the same UE identity to cause data transmission and reception errors. However, since the prior art does not need to perform UE identity conflict detection, there is no scheme for performing UE identity conflict detection in the prior art.
基于此，本发明实施例中将给出PC5接口UE标识冲突检测的方案，用以保证UE与其他UE进行D2D通信时所使用的层2链路标识的唯一性，从而避免多个UE使用相同的UE标识造成的数据收发错误的问题。下面进行说明。Based on this, in the embodiment of the present invention, a solution for detecting the UE 5 interface UE identity conflict is provided, which is used to ensure the uniqueness of the layer 2 link identifier used by the UE in performing D2D communication with other UEs, thereby avoiding the use of the same for multiple UEs. The problem of data transmission and reception errors caused by the UE identity. The following description will be made.
本发明实施例提供的技术方案中，一方面，UE会广播自身使用的层2链路标识；另一方面，也会监听其他UE所使用的层2链路标识，以进行冲突检测，从而保证层2链路标识的唯一性。相应的，下面实施例中将分别提供UE广播自身使用的层2链路标识的方案，以及监听其他UE所使用的层2链路标识进行冲突检测的方案。容易理解，在同一UE上可以同时是采用这两个方案，也可以一个UE仅采用其中一个方案。显然，每一个UE总是在采用其中一个方案时，与采用另一个方案的UE相配合以保证层2链路标识的唯一性。In the technical solution provided by the embodiment of the present invention, on one hand, the UE broadcasts the layer 2 link identifier used by the UE; on the other hand, it also listens to the layer 2 link identifier used by other UEs to perform collision detection, thereby ensuring The uniqueness of the layer 2 link identifier. Correspondingly, in the following embodiments, a scheme for the UE to broadcast the layer 2 link identifier used by the UE and a scheme for monitoring the layer 2 link identifier used by other UEs for collision detection are respectively provided. It is easy to understand that the two schemes can be adopted at the same time on the same UE, or one UE can adopt only one scheme. Obviously, each UE always adopts one of the schemes, and cooperates with the UE adopting another scheme to ensure the uniqueness of the layer 2 link identifier.
图4为层2链路标识的通知方法实施流程示意图，如图所示，包括：4 is a schematic flowchart of a method for implementing a notification method of a layer 2 link identifier, as shown in the figure, including:
步骤401、确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与该UE进行D2D通信的其他UE所使用的层2链路标识；Step 401: Determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs that perform D2D communication with the UE.
步骤402、广播携带有上述层2链路标识的信息。Step 402: Broadcast information carrying the layer 2 link identifier.
图5为层2链路标识的选择方法实施流程示意图，如图所示，包括：FIG. 5 is a schematic flowchart of a method for selecting a layer 2 link identifier, as shown in the figure, including:
步骤501、在UE上接收其他UE广播的携带有层2链路标识的信息；Step 501: Receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier.
步骤502、根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的该UE以外的UE所使用的层2链路标识； Step 502: Determine, according to the layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is other UEs and other UEs that perform D2D communication with other UEs. Layer 2 link identifier used by the UE;
步骤503、根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为UE与其他各个UE进行D2D通信的层2链路标识。Step 503: Select, according to the used layer 2 link identifier group, a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs.
实施中，在步骤402与步骤501中，携带有层2链路标识的信息可以是以下信息之一或者其组合：In the implementation, in step 402 and step 501, the information carrying the layer 2 link identifier may be one of the following information or a combination thereof:
承载在直通链路广播信道(Sidelink Broadcast Channel，SL-BCH)上的广播信息；Broadcast information carried on a Direct Link Broadcast Channel (SL-BCH);
承载在直通链路专用传输信道(Sidelink Discovery Channel，SL-DCH)上的广播信息；Broadcast information carried on a Direct Link Discovery Channel (SL-DCH);
承载在直通链路共享信道(Sidelink Shared Channel，SL-SCH)上的广播信息；Broadcast information carried on a Sidelink Shared Channel (SL-SCH);
承载在PC5接口传输信道上的无线资源控制(Radio Resource Control，RRC)消息；a Radio Resource Control (RRC) message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的非接入层(Non Access Stratum，NAS)消息；Non-access stratum (NAS) messages carried on the PC5 interface transport channel;
承载在MAC层的MAC协议数据单元(Protocol Data Unit，MAC PDU)上的消息。A message carried on a MAC Protocol Data Unit (MAC PDU) of the MAC layer.
具体的，层2标识广播信息可以承载在SL-BCH或SL-DCH或SL-SCH或其他任何PC5接口传输信道上的RRC或NAS消息，也可以是一个MAC层的MAC PDU。Specifically, layer 2 identifies that the broadcast information can be carried in an RRC or NAS message on the SL-BCH or SL-DCH or SL-SCH or any other PC5 interface transport channel, or may be a MAC layer MAC PDU.
图6为MAC PDU对应的MAC subheader结构示意图，图7为MAC PDU格式示意图，以MAC PDU为例，其对应的MAC子头和MAC PDU格式可以是如图6所示。为了和其他MAC PDU区分，可以引入新的逻辑信道标识(Logical Channel ID，LCID)。6 is a schematic diagram of a MAC subheader structure corresponding to a MAC PDU, and FIG. 7 is a schematic diagram of a MAC PDU format. The MAC PDU is taken as an example, and the corresponding MAC subheader and MAC PDU format may be as shown in FIG. 6. In order to distinguish from other MAC PDUs, a new Logical Channel ID (LCID) can be introduced.
在图4与图5提供的技术方案配合使用时，本发明实施例给出的PC5接口UE标识冲突检测方案的要点在于，在PC5接口进行D2D收发的UE将自己的层2链路标识(ProSe Layer-2ID)以及与自己进行通信的UE的层2链路标识广播给附近的UE，而每个UE在开始启动与其他UE的一对一通信前，监听一段时间附近UE的层2链路标识广播信息，避免使用与接收到的任何UE层2链路标识相同的UE层2链路标识发起一对一通信。The main point of the PC5 interface UE identity conflict detection scheme in the embodiment of the present invention is that the UE that performs D2D transceiving on the PC5 interface sets its own layer 2 link identifier (ProSe) when used in conjunction with the technical solutions provided in FIG. Layer-2 ID) and the layer 2 link identity of the UE communicating with itself are broadcast to nearby UEs, and each UE listens for layer 2 links of nearby UEs for a period of time before starting to initiate one-to-one communication with other UEs. The broadcast information is identified to avoid initiating one-to-one communication using the same UE layer 2 link identity as the received UE layer 2 link identity.
在通信过程中，UE除了发送UE层2链路标识广播信息(包括自己的层2链路标识以及与自己进行通信的UE的层2链路标识)外，还需要监听附近其他UE发送的UE层2链路标识广播信息，当接收到没有与自己通信的UE广播的UE层2链路标识信息中包含自己使用的UE层2链路标识时，则认为检测到UE层2链路标识冲突。检测到冲突后，UE只需重新选择一个与所有接收到的层2链路标识都不相同的层2链路标识，并通知所有正与自己进行一对一通信的UE即可。进一步的，该UE和其通信对端UE自然需要更新其层2链路标识广播信息。In the communication process, the UE needs to listen to UEs sent by other nearby UEs in addition to the UE layer 2 link identifier broadcast information (including its own layer 2 link identifier and the layer 2 link identifier of the UE communicating with itself). The layer 2 link identifies the broadcast information. When the UE layer 2 link identifier information broadcasted by the UE that does not communicate with the UE is received, the UE layer 2 link identifier is detected. . After the collision is detected, the UE only needs to reselect a layer 2 link identifier that is different from all received layer 2 link identifiers, and notifies all UEs that are in one-to-one communication with itself. Further, the UE and its communication peer UE naturally need to update their layer 2 link identifier broadcast information.
实施中，步骤503的根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为UE与其他各个UE进行D2D通信的层2链路标识，可以包括：In the implementation, in step 503, according to the used layer 2 link identifier group, the layer 2 link identifier other than the used layer 2 link identifier group is selected as the layer 2 link for the UE to perform D2D communication with other UEs. Identification, which can include:
在确定UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with the other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, performing one of the following manners or a combination thereof;
在UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为UE欲与其他各个UE建立的D2D通信的层2链路标识； When the UE wants to establish D2D communication with other UEs, select the layer 2 link identifier of the used layer 2 link identifier group as the layer 2 link identifier of the D2D communication that the UE wants to establish with other UEs;
在UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将其作为与该UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and the other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used layer 2 The layer 2 link identifier outside the link identification group is used as the layer 2 link identifier for D2D communication with the UE.
实施中，在选择所述已用层2链路标识组以外的层2链路标识作为UE与其他各个UE进行D2D通信的层2链路标识后，为了使其他UE获悉UE使用的层2链路标识的情况，还可以进一步包括：In an implementation, after selecting the layer 2 link identifier of the used layer 2 link identifier group as the layer 2 link identifier of the UE for performing D2D communication with other UEs, in order to enable other UEs to learn the layer 2 chain used by the UE. The road sign may further include:
确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与该UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
下面以具体实例来进行说明。The following is a specific example.
实施例1Example 1
本实施例用以说明当UE(例中为UE1)希望与另一个UE(例中为UE5)建立D2D通信时，确定该UE层2链路标识的实施过程。也即：This embodiment is used to describe the implementation process of determining the UE layer 2 link identifier when the UE (in the example, UE1) wishes to establish D2D communication with another UE (in the example, UE5). That is:
在确定UE欲与其他各个UE建立D2D通信后，在UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为UE欲与其他各个UE建立的D2D通信的层2链路标识。After determining that the UE wants to establish D2D communication with other UEs, when the UE wants to establish D2D communication with other UEs, the layer 2 link identifiers other than the used layer 2 link identifier group are selected as the UE and other UEs. The layer 2 link identifier of the established D2D communication.
具体的，在一对一通信发起前，在层2链路标识选择时，是在所述已用层2链路标识组以外，选择一个层2链路标识来作为欲与其他UE建立的D2D通信的层2链路标识即可。Specifically, before the one-to-one communication is initiated, when the layer 2 link identifier is selected, a layer 2 link identifier is selected as the D2D to be established with other UEs except the used layer 2 link identifier group. The layer 2 link identifier of the communication is sufficient.
图8为一对一通信发起前层2链路标识选择的通信场景示意图，图中所使用的最内层的空白区域、第二层的点状区域、第三层的网格状区域的含义可以参考图3，在图8所示的环境下，假设：FIG. 8 is a schematic diagram of a communication scenario in which the link identification of the layer 2 is initiated before the one-to-one communication initiation, and the meaning of the innermost blank area, the second layer of the dot area, and the third layer of the grid-like area used in the figure. Referring to Figure 3, in the environment shown in Figure 8, assume:
UE5(层2链路标识为L2 ID5)正在与UE2(层2链路标识为L2 ID2)和UE7(层2链路标识为L2 ID7)进行一对一通信；UE5 (layer 2 link identifier is L2 ID5) is performing one-to-one communication with UE2 (layer 2 link identifier is L2 ID2) and UE7 (layer 2 link identifier is L2 ID7);
UE2(层2链路标识为L2 ID2)正在与UE3(层2链路标识为L2 ID3)和UE5(层2链路标识为L2 ID5)进行一对一通信；UE2 (layer 2 link identifier is L2 ID2) is performing one-to-one communication with UE3 (layer 2 link identifier is L2 ID3) and UE5 (layer 2 link identifier is L2 ID5);
UE3(层2链路标识为L2 ID3)正在与UE2(层2链路标识为L2 ID2)和UE4(层2链路标识为L2 ID4)进行一对一通信；UE3 (layer 2 link identifier is L2 ID3) is performing one-to-one communication with UE2 (layer 2 link identifier is L2 ID2) and UE4 (layer 2 link identifier is L2 ID4);
UE1，UE6和UE8没有与其他UE进行通信。UE1, UE6 and UE8 do not communicate with other UEs.
UE2广播的层2链路标识广播信息为：L2 ID2，L2 ID3，L2 ID5；The layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5;
UE3广播的层2链路标识广播信息为：L2 ID3，L2 ID2，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
UE4广播的层2链路标识广播信息为：L2 ID4，L2 ID3；The layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3;
UE5广播的层2链路标识广播信息为：L2 ID5，L2 ID2，L2 ID7；The layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7;
UE7广播的层2链路标识广播信息为：L2 ID7，L2 ID5。 The layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5.
例中，UE1希望发起与UE5的一对一通信，UE1可以接收到UE2和UE5的层2链路标识广播信息，因此UE1可以获知的正在被使用的层2链路标识为：L2 ID2，L2 ID3，L2 ID5，L2 ID7，则，UE1需要避免选择这4个层2链路标识。For example, UE1 wants to initiate one-to-one communication with UE5, and UE1 can receive layer 2 link identification broadcast information of UE2 and UE5, so that the layer 2 link identifier that UE1 can learn is being used: L2 ID2, L2 ID3, L2 ID5, L2 ID7, then, UE1 needs to avoid selecting these 4 layer 2 link identifiers.
具体的，UE1可以将根据接收到的附近UE广播的层2链路标识使用情况，将这些已经被使用的层2标识标记为不可用，其他为可用，并从可用的L2标识中随机选择或者按照一定规则选择一个L2标识。本实施例中UE1选择了L2 ID4作为自己的层2链路标识，并与UE5建立一对一通信。Specifically, the UE1 may mark the layer 2 identifiers that have been used as unavailable according to the received layer 2 link identifier usage broadcast by the nearby UEs, and others are available, and randomly selected from the available L2 identifiers or Select an L2 identifier according to certain rules. In this embodiment, UE1 selects L2 ID4 as its own layer 2 link identifier, and establishes one-to-one communication with UE5.
例中，还可以进一步包括：In the example, it may further include:
确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与该UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
也即，之后的各UE的层2链路标识广播信息更新为：That is, the layer 2 link identification broadcast information of each subsequent UE is updated to:
UE1广播的层2链路标识广播信息为：L2 ID4，L2 ID5；The layer 2 link identifier broadcast information broadcast by UE1 is: L2 ID4, L2 ID5;
UE2广播的层2链路标识广播信息为：L2 ID2，L2 ID3，L2 ID5；The layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5;
UE3广播的层2链路标识广播信息为：L2 ID3，L2 ID2，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
UE4广播的层2链路标识广播信息为：L2 ID4，L2 ID3；The layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3;
UE5广播的层2链路标识广播信息为：L2 ID5，L2 ID2，L2 ID7，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7, L2 ID4;
UE7广播的层2链路标识广播信息为：L2 ID7，L2 ID5。The layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5.
实施例2Example 2
本实施例用以说明当某一UE(例中为UE4)发生变化，例如移动后导致层2链路标识发生变化，UE(例中为UE1)与另一个UE(例中为UE5)之间存在D2D通信时，当该UE(例中为UE4)的变动导致UE(例中为UE1)层2链路标识发生冲突后，确定该UE层2链路标识的实施过程。也即：This embodiment is used to illustrate that when a certain UE (in the example, UE4) changes, for example, the layer 2 link identifier changes after the mobile, and the UE (in the example, UE1) and another UE (in the example, UE5) When there is D2D communication, when the UE (in the example, UE4) changes, the UE (in the case of UE1) layer 2 link identifier conflicts, the implementation process of the UE layer 2 link identifier is determined. That is:
在UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将其作为与该UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and the other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used layer 2 The layer 2 link identifier outside the link identification group is used as the layer 2 link identifier for D2D communication with the UE.
具体的，在一对一通信过程中，发现层2链路标识冲突后，在层2链路标识选择时，是UE1变更正在使用的层2链路标识，在所述已用层2链路标识组以外，选择一个层2链路标识来作为与UE5建立的D2D通信的层2链路标识即可。Specifically, in the one-to-one communication process, after the layer 2 link identifier conflict is found, when the layer 2 link identifier is selected, the UE1 changes the layer 2 link identifier that is being used, and the used layer 2 link In addition to the identification group, a layer 2 link identifier is selected as the layer 2 link identifier of the D2D communication established with the UE 5.
图9为一对一通信过程中发现层2链路标识冲突的通信场景示意图，图中所使用的最内层的空白区域、第二层的点状区域、第三层的网格状区域的含义可以参考图3，在图9所示的环境下，假设一对一通信关系同实施例1。FIG. 9 is a schematic diagram of a communication scenario in which a layer 2 link identifier conflict is found during one-to-one communication, and the innermost blank area, the second layer of the dotted area, and the third layer of the grid-like area are used in the figure. The meaning can be referred to FIG. 3. In the environment shown in FIG. 9, a one-to-one communication relationship is assumed to be the same as Embodiment 1.
又假设：UE4移动到点状区域并发起与UE2的一对一通信，之后各UE的层2链路标 识广播信息更新为：It is also assumed that UE4 moves to the point area and initiates one-to-one communication with UE2, after which the layer 2 link of each UE The broadcast information is updated to:
UE1广播的层2链路标识广播信息为：L2 ID4，L2 ID5；The layer 2 link identifier broadcast information broadcast by UE1 is: L2 ID4, L2 ID5;
UE2广播的层2链路标识广播信息为：L2 ID2，L2 ID3，L2 ID5，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5, L2 ID4;
UE3广播的层2链路标识广播信息为：L2 ID3，L2 ID2，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
UE4广播的层2链路标识广播信息为：L2 ID4，L2 ID3，L2 ID2；The layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3, L2 ID2;
UE5广播的层2链路标识广播信息为：L2 ID5，L2 ID2，L2 ID7，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7, L2 ID4;
UE7广播的层2链路标识广播信息为：L2 ID7，L2 ID5；The layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5;
例中，UE1接收UE2和UE5的层2链路标识广播信息后，除了与自己有一对一通信关系的UE(UE5)发送的层2链路标识广播信息中包含自己使用的层2链路标识(L2 ID4)外，与自己没有一对一通信关系的UE(UE2)发送的层2链路标识广播信息中也包含自己使用的层2链路标识(L2 ID4)，因而判断发生层2链路标识冲突，则，UE1重新选择一个层2链路标识(L2 ID1)，将新的层2链路标识通知给与自己有一对一通信关系的UE(UE5)。For example, after the UE1 receives the layer 2 link identifier broadcast information of the UE2 and the UE5, the layer 2 link identifier broadcast information sent by the UE (UE5) that has a one-to-one communication relationship with itself includes the layer 2 link identifier used by itself. (L2 ID4), the layer 2 link identification broadcast information transmitted by the UE (UE2) that does not have a one-to-one communication relationship with itself also includes the layer 2 link identifier (L2 ID4) used by itself, and thus the layer 2 chain is determined to be generated. If the path identifier conflicts, UE1 reselects a layer 2 link identifier (L2 ID1), and notifies the new layer 2 link identifier to the UE (UE5) having a one-to-one communication relationship with itself.
也即，正在进行D2D通信的UE通过检测其他UE广播的层2链路标识，判断是否发生层2链路标识碰撞，当发现自己使用的层2链路标识与其他UE所使用的层2链路标识一样时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，将其作为该UE进行D2D通信的层2链路标识，并将新的层2链路标识通知给与其进行D2D通信的UE，更新UE的层2链路标识广播信息。That is, the UE that is performing D2D communication determines whether the layer 2 link identifier collision occurs by detecting the layer 2 link identifier broadcasted by other UEs, and discovers the layer 2 link identifier used by itself and the layer 2 chain used by other UEs. When the road identifier is the same, the layer 2 link identifier used is replaced with the layer 2 link identifier of the used layer 2 link identifier group, and is used as the layer 2 link identifier of the UE for D2D communication. The new layer 2 link identifier is notified to the UE with which D2D communication is performed, and the layer 2 link identifier broadcast information of the UE is updated.
例中，还可以进一步包括：In the example, it may further include:
确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与该UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
也即，之后的各UE的层2链路标识广播信息更新为：That is, the layer 2 link identification broadcast information of each subsequent UE is updated to:
UE1广播的层2链路标识广播信息为：L2 ID1，L2 ID5；The layer 2 link identifier broadcast information broadcast by UE1 is: L2 ID1, L2 ID5;
UE2广播的层2链路标识广播信息为：L2 ID2，L2 ID3，L2 ID5，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE2 is: L2 ID2, L2 ID3, L2 ID5, L2 ID4;
UE3广播的层2链路标识广播信息为：L2 ID3，L2 ID2，L2 ID4；The layer 2 link identifier broadcast information broadcast by UE3 is: L2 ID3, L2 ID2, L2 ID4;
UE4广播的层2链路标识广播信息为：L2 ID4，L2 ID3，L2 ID2；The layer 2 link identifier broadcast information broadcast by UE4 is: L2 ID4, L2 ID3, L2 ID2;
UE5广播的层2链路标识广播信息为：L2 ID5，L2 ID2，L2 ID7，L2 ID1；The layer 2 link identifier broadcast information broadcast by UE5 is: L2 ID5, L2 ID2, L2 ID7, L2 ID1;
UE7广播的层2链路标识广播信息为：L2 ID7，L2 ID5。The layer 2 link identifier broadcast information broadcast by UE7 is: L2 ID7, L2 ID5.
基于同一发明构思，本发明实施例中还提供了一种层2链路标识的选择装置、一种层2链路标识的通知装置，由于这些装置解决问题的原理与一种层2链路标识的选择方法、一种层2链路标识的通知方法相似，因此这些装置的实施可以参见方法的实施，重复之处不再赘述。 Based on the same inventive concept, the embodiment of the present invention further provides a layer 2 link identifier selection device, and a layer 2 link identifier notification device. The principle of solving the problem by these devices and a layer 2 link identifier The selection method and the notification method of a layer 2 link identifier are similar. Therefore, the implementation of these devices can be referred to the implementation of the method, and the repeated description is not repeated.
图10为层2链路标识的选择装置结构示意图，如图所示，可以包括：FIG. 10 is a schematic structural diagram of a device for selecting a link identifier of a layer 2, as shown in the figure, which may include:
接收模块1001，用于在UE上接收其他UE广播的携带有层2链路标识的信息；The receiving module 1001 is configured to receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier.
确定模块1002，用于根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的该UE以外的UE所使用的层2链路标识；The determining module 1002 is configured to determine, according to the layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is another UE and performs D2D communication with other UEs. Layer 2 link identifier used by UEs other than the UE;
选择模块1003，用于根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识。The selecting module 1003 is configured to select, according to the used layer 2 link identifier group, a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 for performing D2D communication between the UE and other UEs. Link ID.
实施中，选择模块还可以进一步用于：In the implementation, the selection module can be further used to:
在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
实施中，确定模块还可以进一步用于确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与该UE进行D2D通信的其他UE所使用的层2链路标识；In an implementation, the determining module may be further configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
则选择装置中还可以进一步包括：The selection device may further include:
广播模块1004，用于广播携带有上述层2链路标识的信息。The broadcast module 1004 is configured to broadcast information carrying the layer 2 link identifier.
实施中，携带有层2链路标识的信息可以是以下信息之一或者其组合：In implementation, the information carrying the layer 2 link identifier may be one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
图11为层2链路标识的通知装置结构示意图，如图所示，可以包括：11 is a schematic structural diagram of a notification device of a layer 2 link identifier, as shown in the figure, which may include:
确定模块1101，用于确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；a determining module 1101, configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
广播模块1102，用于广播携带有上述层2链路标识的信息。The broadcast module 1102 is configured to broadcast information carrying the layer 2 link identifier.
实施中，携带有层2链路标识的信息可以是以下信息之一或者其组合：In implementation, the information carrying the layer 2 link identifier may be one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息； Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
为了描述的方便，以上所述装置的各部分以功能分为各种模块或单元分别描述。当然，在实施本发明时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。For convenience of description, the various parts of the above described devices are described in terms of functions divided into various modules or units. Of course, the functions of the various modules or units may be implemented in one or more software or hardware in the practice of the invention.
在实施本发明实施例提供的技术方案时，可以按如下方式实施。When the technical solution provided by the embodiment of the present invention is implemented, it can be implemented as follows.
图12为UE一结构示意图，如图所示，UE包括：FIG. 12 is a schematic structural diagram of a UE. As shown in the figure, the UE includes:
处理器1200，用于读取存储器1220中的程序，执行下列过程：The processor 1200 is configured to read a program in the memory 1220 and perform the following process:
根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的所述UE以外的UE所使用的层2链路标识；Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, where the used layer 2 link identifier group is other UEs and UEs other than the UE performing D2D communication with other UEs The layer 2 link identifier used;
根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识。And selecting, according to the used layer 2 link identifier group, a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs.
收发机1210，用于在处理器1200的控制下收发数据，执行下列过程：The transceiver 1210 is configured to send and receive data under the control of the processor 1200, and performs the following processes:
接收其他UE广播的携带有层2链路标识的信息。Receiving information carried by other UEs carrying the layer 2 link identifier.
实施中，根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识时，处理器1200用于：In an implementation, according to the used layer 2 link identifier group, selecting a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link identifier for D2D communication between the UE and other UEs. At the time, the processor 1200 is configured to:
在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
实施中，处理器1200还可以进一步用于：In implementation, the processor 1200 can further be used to:
确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
收发机1210还可以进一步用于：The transceiver 1210 can further be used to:
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
实施中，携带有层2链路标识的信息是以下信息之一或者其组合：In the implementation, the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息； Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
其中，在图12中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1200代表的一个或多个处理器和存储器1220代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1210可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口1230还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。In FIG. 12, the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1200 and various circuits of memory represented by memory 1220. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 1210 may be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 1230 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
处理器1200负责管理总线架构和通常的处理，存储器1220可以存储处理器1200在执行操作时所使用的数据。The processor 1200 is responsible for managing the bus architecture and general processing, and the memory 1220 can store data used by the processor 1200 in performing operations.
图13为UE二结构示意图，如图所示，UE包括：FIG. 13 is a schematic diagram of a structure of a UE. As shown in the figure, the UE includes:
处理器1300，用于读取存储器1320中的程序，执行下列过程：The processor 1300 is configured to read a program in the memory 1320 and perform the following process:
确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
收发机1310，用于在处理器1300的控制下发送数据，执行下列过程：The transceiver 1310 is configured to send data under the control of the processor 1300, and performs the following process:
广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
实施中，携带有层2链路标识的信息是以下信息之一或者其组合：In the implementation, the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
其中，在图13中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1300代表的一个或多个处理器和存储器1320代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。收发机1310可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口1330还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。 In FIG. 13, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1300 and various circuits of memory represented by memory 1320. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. Transceiver 1310 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 1330 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
处理器1300负责管理总线架构和通常的处理，存储器1320可以存储处理器1300在执行操作时所使用的数据。The processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1320 can store data used by the processor 1300 in performing operations.
综上所述，在本发明实施例提供的技术方案中，在PC5接口进行D2D收发的UE将自己的层2链路标识以及与自己进行通信的UE的层2链路标识广播给附近的UE，而每个UE通过发起通信前的层2链路标识监听及通信过程中的层2链路标识碰撞检测实现层2链路标识的冲突避免和解决。具体包括如下方案：In summary, in the technical solution provided by the embodiment of the present invention, the UE performing D2D transmission and reception on the PC5 interface broadcasts its own layer 2 link identifier and the layer 2 link identifier of the UE communicating with itself to the nearby UE. And each UE realizes the collision avoidance and resolution of the layer 2 link identifier by layer 2 link identifier collision detection in the layer 2 link identifier monitoring and communication process before the communication is initiated. Specifically, the following programs are included:
进行一对一通信的UE广播自己和与自己进行通信的UE的层2链路标识。The UE performing one-to-one communication broadcasts the layer 2 link identity of itself and the UE communicating with itself.
UE在发起与其他UE的一对一通信前，先读取附近UE的层2链路标识广播信息，选择与接收到的层2链路标识不同的层2链路标识。Before initiating one-to-one communication with other UEs, the UE first reads the layer 2 link identifier broadcast information of the nearby UE, and selects the layer 2 link identifier different from the received layer 2 link identifier.
UE在通信过程中继续监听周围UE的层2链路标识广播信息，当接收到非与自己通信的UE广播的UE层2链路标识信息中包含自己使用的UE层2链路标识，则认为检测到UE层2链路标识冲突。The UE continues to listen to the layer 2 link identifier broadcast information of the surrounding UEs during the communication process, and when the UE layer 2 link identifier information broadcasted by the UE that does not communicate with the UE is included in the UE layer 2 link identifier, A UE layer 2 link identity conflict is detected.
UE判断发生层2链路标识冲突后，选择一个新的与所有接收到的层2链路标识不同的层2链路标识，并将新层2链路标识通知给与自己进行通信的UE。After determining that the layer 2 link identifier conflict occurs, the UE selects a new layer 2 link identifier different from all received layer 2 link identifiers, and notifies the new layer 2 link identifier to the UE that communicates with itself.
变更层2链路标识的UE及与之进行通信的UE更新层2链路标识广播信息。The UE that changes the layer 2 link identifier and the UE that communicates with it update layer 2 link identification broadcast information.
UE可以维护层2链路标识占用情况的数据库，根据接收到的附近UE广播的层2链路标识更新该数据库，将接收到的层2链路标识标为不可用，当UE需要生成层2链路标识时，可以从可用的层2链路标识中生成。The UE may maintain a database of the layer 2 link identifier occupation status, update the database according to the received layer 2 link identifier broadcasted by the nearby UE, and mark the received layer 2 link identifier as unavailable, when the UE needs to generate the layer 2 When the link is identified, it can be generated from the available layer 2 link identifier.
UE发送的层2链路标识广播信息可以是承载在SL-BCH或SL-DCH或SL-SCH或其他任何PC5接口传输信道上的RRC或NAS消息，也可以是一个MAC层的MAC PDU。The layer 2 link identifier broadcast information sent by the UE may be an RRC or NAS message carried on the SL-BCH or SL-DCH or SL-SCH or any other PC5 interface transport channel, or may be a MAC layer MAC PDU.
本发明实施例提供了一种PC5接口UE标识的冲突避免和碰撞解决方案，从而在现有D2D通信机制的基础上，为接入层的一对一通信提供了解决方案。The embodiment of the invention provides a conflict avoidance and collision solution for the PC5 interface UE identifier, thereby providing a solution for the one-to-one communication of the access layer based on the existing D2D communication mechanism.
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的 装置。The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. To implement the functions specified in one or more blocks of a flow or a flow and/or block diagram of a flowchart Device.
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。 It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims (18)

  1. 一种层2链路标识的选择方法，其特征在于，包括：A method for selecting a layer 2 link identifier, comprising:
    在用户设备UE上接收其他UE广播的携带有层2链路标识的信息；Receiving, by the user equipment UE, information carrying the layer 2 link identifier broadcast by other UEs;
    根据各信息中携带的层2链路标识确定已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行设备到设备D2D通信的所述UE以外的UE所使用的层2链路标识；Determining the used layer 2 link identifier group according to the layer 2 link identifier carried in each information, the used layer 2 link identifier group being other UEs and other UEs performing device-to-device D2D communication with other UEs Layer 2 link identifier used by the UE;
    根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识。And selecting, according to the used layer 2 link identifier group, a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs.
  2. 根据权利要求1所述的方法，其特征在于，根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识，包括：The method according to claim 1, wherein a layer 2 link identifier other than the used layer 2 link identification group is selected as the UE and each other according to the used layer 2 link identification group. The layer 2 link identifier of the UE for D2D communication, including:
    在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
    在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
    在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  3. 根据权利要求1或2所述的方法，其特征在于，进一步包括：The method of claim 1 or 2, further comprising:
    确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
    广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
  4. 根据权利要求3所述的方法，其特征在于，携带有层2链路标识的信息是以下信息之一或者其组合：The method according to claim 3, wherein the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
    承载在直通链路广播信道SL-BCH上的广播信息；Broadcast information carried on the through link broadcast channel SL-BCH;
    承载在直通链路专用传输信道SL-DCH上的广播信息；Broadcast information carried on the direct link dedicated transport channel SL-DCH;
    承载在直通链路共享信道SL-SCH上的广播信息；Broadcast information carried on the through link shared channel SL-SCH;
    承载在PC5接口传输信道上的无线资源控制RRC消息；a radio resource control RRC message carried on a PC5 interface transport channel;
    承载在PC5接口传输信道上的非接入层NAS消息；a non-access stratum NAS message carried on a PC5 interface transport channel;
    承载在媒体接入控制MAC层的MAC协议数据单元PDU上的消息。A message carried on a MAC Protocol Data Unit PDU of the Medium Access Control MAC layer.
  5. 一种层2链路标识的通知方法，其特征在于，包括：A method for notifying a layer 2 link identifier, comprising:
    确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识； Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
    广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
  6. 根据权利要求5所述的方法，其特征在于，携带有层2链路标识的信息是以下信息之一或者其组合：The method according to claim 5, wherein the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
    承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
    承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
    承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
    承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
    承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
    承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
  7. 一种层2链路标识的选择装置，其特征在于，包括：A device for selecting a layer 2 link identifier, comprising:
    接收模块，用于在UE上接收其他UE广播的携带有层2链路标识的信息；a receiving module, configured to receive, on the UE, information that is carried by another UE and carries a layer 2 link identifier;
    确定模块，用于根据各信息中携带的层2链路标识确定所述已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的所述UE以外的UE所使用的层2链路标识；a determining module, configured to determine, according to a layer 2 link identifier carried in each information, the used layer 2 link identifier group, where the used layer 2 link identifier group is another UE and performs D2D communication with other UEs a layer 2 link identifier used by a UE other than the UE;
    选择模块，用于根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识。a selection module, configured to select, according to the used layer 2 link identifier group, a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 chain for performing D2D communication between the UE and other UEs Road sign.
  8. 根据权利要求7所述的装置，其特征在于，选择模块进一步用于：The apparatus according to claim 7, wherein the selection module is further configured to:
    在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
    在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
    在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  9. 根据权利要求7或8所述的装置，其特征在于，Device according to claim 7 or 8, characterized in that
    确定模块进一步用于确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；The determining module is further configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
    进一步包括：广播模块，用于广播携带有上述层2链路标识的信息。The method further includes: a broadcast module, configured to broadcast information carrying the layer 2 link identifier.
  10. 根据权利要求9所述的装置，其特征在于，携带有层2链路标识的信息是以下信息之一或者其组合：The apparatus according to claim 9, wherein the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
    承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
    承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
    承载在SL-SCH上的广播信息； Broadcast information carried on the SL-SCH;
    承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
    承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
    承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
  11. 一种层2链路标识的通知装置，其特征在于，包括：A notification device for layer 2 link identification, comprising:
    确定模块，用于确定UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；a determining module, configured to determine a layer 2 link identifier used by the UE to perform D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
    广播模块，用于广播携带有上述层2链路标识的信息。The broadcast module is configured to broadcast information carrying the layer 2 link identifier.
  12. 根据权利要求11所述的装置，其特征在于，携带有层2链路标识的信息是以下信息之一或者其组合：The apparatus according to claim 11, wherein the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
    承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
    承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
    承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
    承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
    承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
    承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
  13. 一种用户设备UE，其特征在于，包括：A user equipment (UE), comprising:
    处理器，用于读取存储器中的程序，执行下列过程：A processor for reading a program in the memory, performing the following process:
    根据各信息中携带的层2链路标识确定已用层2链路标识组，所述已用层2链路标识组是其他UE及与其他UE进行D2D通信的所述UE以外的UE所使用的层2链路标识；The used layer 2 link identifier group is determined according to the layer 2 link identifier carried in each information, and the used layer 2 link identifier group is used by other UEs and UEs other than the UE that performs D2D communication with other UEs. Layer 2 link identifier;
    根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识；Determining, according to the used layer 2 link identifier group, a layer 2 link identifier of the used layer 2 link identifier group as a layer 2 link identifier for performing D2D communication between the UE and other UEs;
    收发机，用于在处理器的控制下收发数据，执行下列过程：The transceiver is used to send and receive data under the control of the processor, and performs the following processes:
    接收其他UE广播的携带有层2链路标识的信息。Receiving information carried by other UEs carrying the layer 2 link identifier.
  14. 根据权利要求13所述的UE，其特征在于，根据所述已用层2链路标识组，选择所述已用层2链路标识组以外的层2链路标识作为所述UE与其他各个UE进行D2D通信的层2链路标识时，处理器用于：The UE according to claim 13, wherein, according to the used layer 2 link identification group, a layer 2 link identifier other than the used layer 2 link identification group is selected as the UE and each other When the UE performs the layer 2 link identification of the D2D communication, the processor is used to:
    在确定所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识后，和/或，在确定所述UE欲与其他各个UE建立D2D通信后，按如下方式之一或者其组合执行；After determining the layer 2 link identifier used by the UE to establish D2D communication with other UEs, and/or after determining that the UE wants to establish D2D communication with other UEs, one of the following manners or Combined execution
    在所述UE欲与其他各个UE建立D2D通信时，选择所述已用层2链路标识组以外的层2链路标识作为所述UE欲与其他各个UE建立的D2D通信的层2链路标识；When the UE wants to establish D2D communication with other UEs, select a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link of the D2D communication that the UE wants to establish with other UEs. Identification
    在所述UE与其他各个UE已建立的D2D通信所使用的层2链路标识属于所述已用层2链路标识组时，将该所使用的层2链路标识更换为所述已用层2链路标识组以外的层2链路标识，并将更换后的层2链路标识作为与所述UE进行D2D通信的层2链路标识。 When the layer 2 link identifier used by the UE and other UEs established by the D2D communication belongs to the used layer 2 link identifier group, the used layer 2 link identifier is replaced with the used The layer 2 link identifies the layer 2 link identifier other than the group, and replaces the layer 2 link identifier as the layer 2 link identifier for D2D communication with the UE.
  15. 根据权利要求13或14所述的UE，其特征在于，处理器进一步用于：The UE according to claim 13 or 14, wherein the processor is further configured to:
    确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
    收发机进一步用于：The transceiver is further used to:
    广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
  16. 根据权利要求15所述的UE，其特征在于，携带有层2链路标识的信息是以下信息之一或者其组合：The UE according to claim 15, wherein the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
    承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
    承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
    承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
    承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
    承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
    承载在MAC层的MAC PDU上的消息。A message carried on a MAC PDU of the MAC layer.
  17. 一种用户设备UE，其特征在于，包括：A user equipment (UE), comprising:
    处理器，用于读取存储器中的程序，执行下列过程：A processor for reading a program in the memory, performing the following process:
    确定所述UE与其他各个UE进行D2D通信所使用的层2链路标识，以及与所述UE进行D2D通信的其他UE所使用的层2链路标识；Determining a layer 2 link identifier used by the UE for D2D communication with other UEs, and a layer 2 link identifier used by other UEs performing D2D communication with the UE;
    收发机，用于在处理器的控制下发送数据，执行下列过程：A transceiver for transmitting data under the control of a processor, performing the following processes:
    广播携带有上述层2链路标识的信息。The broadcast carries the information of the layer 2 link identifier described above.
  18. 根据权利要求17所述的UE，其特征在于，携带有层2链路标识的信息是以下信息之一或者其组合：The UE according to claim 17, wherein the information carrying the layer 2 link identifier is one of the following information or a combination thereof:
    承载在SL-BCH上的广播信息；Broadcast information carried on the SL-BCH;
    承载在SL-DCH上的广播信息；Broadcast information carried on the SL-DCH;
    承载在SL-SCH上的广播信息；Broadcast information carried on the SL-SCH;
    承载在PC5接口传输信道上的RRC消息；An RRC message carried on a PC5 interface transport channel;
    承载在PC5接口传输信道上的NAS消息；NAS message carried on the transport channel of the PC5 interface;
    承载在MAC层的MAC PDU上的消息。 A message carried on a MAC PDU of the MAC layer.
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