WO2016202227A1 - Procédé et dispositif de sélection et de notification d'identifiant de liaison de couche 2 - Google Patents

Procédé et dispositif de sélection et de notification d'identifiant de liaison de couche 2 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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English (en)
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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    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif de sélection et de notification d'identifiant de liaison de couche 2. Le procédé comprend les étapes consistant à : dans une solution de notification, déterminer un identifiant de liaison de couche 2 utilisés par la communication de dispositif à dispositif entre un équipement d'utilisateur et chacun d'autres équipements d'utilisateur ; et diffuser des informations contenant l'identifiant de liaison de couche 2. Dans une solution de sélection, l'équipement d'utilisateur : reçoit les informations contenant les identifiants de liaison de couche 2, diffusées par les autres équipements d'utilisateur ; détermine un groupe d'identifiants de liaison de couche 2 utilisés, d'après l'identifiant de liaison de couche 2 contenu dans les diverses informations ; et sélectionne un identifiant de liaison de couche 2 autre que le groupe d'identifiants de liaison de couche 2 utilisés, en tant qu'un identifiant de liaison de couche 2 pour la communication de dispositif à dispositif entre l'équipement d'utilisateur actuel et chacun des autres équipements d'utilisateur d'après le groupe d'identifiants de liaison de couche 2 utilisés. La présente invention peut garantir le caractère unique des identifiants de couche 2 utilisés dans la communication de dispositif à dispositif entre un équipement d'utilisateur et d'autres équipements d'utilisateur, et empêcher le problème de réception de données et les erreurs de transmission dus au fait qu'une pluralité d'équipements utilisateur utilise le même identifiant d'équipement d'utilisateur.
PCT/CN2016/085611 2015-06-19 2016-06-13 Procédé et dispositif de sélection et de notification d'identifiant de liaison de couche 2 WO2016202227A1 (fr)

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