WO2017024909A1

WO2017024909A1 - Method and device for data transmission

Info

Publication number: WO2017024909A1
Application number: PCT/CN2016/088947
Authority: WO
Inventors: 张惠英
Original assignee: 电信科学技术研究院
Priority date: 2015-08-11
Filing date: 2016-07-06
Publication date: 2017-02-16
Also published as: CN106454806A; CN106454806B

Abstract

The embodiments of the present application relate to the technical field of wireless communications, and particularly to a method and device for data transmission, which are used for solving the problem existing in the prior art that there is an identifier conflict since an identifier of an interface PC5 cannot be applied to a UE to Network Relay scenario. In the embodiments of the present application, a Relay UE uses a first layer-2 identifier to perform data transmission with a Remote UE using a second layer-2 identifier. Since the first layer-2 identifier and the second layer-2 identifier comprise the same specific identifier of the Relay UE which is allocated by a network side, and the second layer-2 identifier also comprises a specific identifier of the Remote UE which is allocated by the Relay UE, an identifier of an interface PC5 is unique within a certain range, thereby avoiding a conflict of the identifier of the interface PC5 within the certain range, and thus ensuring that the identifier of the interface PC5 can be applied to a UE to Network Relay scenario.

Description

Method and device for data transmission

This application claims priority to Chinese Patent Application No. 201510491101.8, entitled "A Method and Apparatus for Data Transmission", filed on August 11, 2015, the entire contents of which is incorporated herein by reference. In the application.

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method and device for performing data transmission.

Background technique

In the Long Term Evolution (LTE) system, the centralized control of the network is adopted, that is, the uplink and downlink data of the user equipment (User Equipment, UE, also referred to as the terminal) are transmitted under the control of the network. receive. The communication between the UE and the UE is forwarded and controlled by the network. There is no direct communication link between the UE and the UE, and the UE is also not allowed to send uplink data by itself, see FIG. 1A.

Device-to-device (D2D), that is, user equipment pass-through technology, refers to a way in which neighboring user equipment can transmit data through a direct link in a short range without passing through a central node (ie, a base station). ) Forwarding, as shown in Figure 1B.

In the 3rd Generation Partnership Project (3GPP), the D2D proximity service includes the following two categories: D2D discovery: UE uses Evolved-Universal Terrestrial Radio Access (E-UTRA) To confirm that another UE is nearby. For example, 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, thus converting a communication link originally transmitted through the network into a local direct communication link, saving a large amount of bandwidth and network efficiency; 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 eNB (Evolved Base Station) may even dynamically allocate resources for the UE performing the proximity service communication.

At present, D2D communication includes two types of links: a D2D link: a link that directly communicates between a device and a device; and a Device-to-Network (D2N) link: a communication between a device and a network node. Link.

A UE participating in D2D discovery/communication includes two roles: a D2D transmitting UE: a UE transmitting a D2D discovery/communication message; and a D2D receiving UE: a UE receiving a discovery/communication message transmitted by the D2D transmitting UE.

An interface for direct interaction between a UE and a UE, called a PC5 interface, is introduced in 3GPP Rel-12.

Based on the D2D discovery and communication technology, the UE can perform data transmission with the network through a relay (relay).

The manner in which the UE communicates with the network through the Relay (Relay) UE is called UE-to-Network Relay, as shown in FIG. 1C. In order to communicate with the network, UE2 outside the network coverage uses UE1 as a Relay node. The UE1 forwards its own uplink and downlink signals. The communication between the UE1 and the UE2 is implemented by D2D communication, and the UE1 and the network are implemented by using cellular communication.

Relay UE: A UE that provides Relay services for other UEs. Remote UE: A UE outside the network coverage needs to implement UE communication with the network through the Relay node.

The manner in which the UE performs discovery/communication with the target UE through the Relay UE is called UE-to-UE relay, as shown in FIG. 1D. In order to communicate with the UE3 that is not in the direct communication range of the UE, the UE2 can forward its own information through the UE1, wherein the UE1 and the UE2, the UE1 and the UE3 implement data transmission through D2D communication.

Currently, 3GPP Rel-12 has implemented one-to-many communication of the PC5 interface. The main principle is that the intra-group transmitting UE identifies itself by the source address (SRC) in the Medium Access Control (MAC) sub-header; After receiving the data packet, the intra-group receiving UE firstly 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 group identification information is related to itself. The group ID (ProSe Layer-2 Group ID) is the same. If they are the same, the receiving is confirmed, otherwise it is discarded.

In the UE to Network Relay scenario, the one-to-one communication mode is adopted between the Relay UE and the Remote UE, and the identifier of the PC5 interface is used as the source and destination addresses. Currently, in order to avoid the UE identifier being too long, the global unique identifier is not used. The ID of the PC5 interface is incorrect. The ID of the current PC5 interface cannot be applied to the UE to Network Relay scenario.

Summary of the invention

The embodiments of the present invention provide a method and a device for performing data transmission, so as to prevent an identifier conflict from occurring when the identifier of the PC5 interface existing in the prior art is applied to the UE to Network Relay scenario.

A method for performing data transmission according to an embodiment of the present invention includes:

The relay terminal Relay UE determines the first layer 2 identifier;

The relay UE uses the first layer 2 identifier to perform data transmission with the remote terminal Remote UE identified by the second layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .

Optionally, the relay UE determines the identifier of the first layer 2, including: the relay UE requests a specific identifier from the network side, and identifies the layer 2 identifier allocated by the network side as the first layer 2 identifier; or, the Relay UE Determining, by the network side, a specific identifier, and combining, according to the pre-configured second part identifier, the first part identifier allocated by the network side into the first layer 2 identifier; or, the Relay UE requests a specific identifier from the network side, and the relay is The second part identifier assigned by the UE is combined with the first part identifier assigned by the network side into the first layer 2 identifier.

Optionally, before the relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by using the second layer 2, the method further includes: the Relay UE broadcasts the first layer 2 identifier to notify the remote UE Relay The specific identity of the UE.

Optionally, the Relay UE further broadcasts information used to indicate the number of bits occupied by the first part identifier in the first layer 2 identifier.

Optionally, before the relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2, the method further includes: after the one-to-one communication request of the Remote UE is received by the Relay UE, , the second part identifier is assigned to the Remote UE.

Optionally, the relay UE allocates the second part identifier to the at least one remote UE, including: the Relay UE assigns a second part identifier to the Remote UE by using a one-to-one communication setup message; wherein the one-to-one communication establishment The source layer 2 in the message is identified as the first layer 2 identifier, and the destination layer 2 is identified as the source layer 2 identifier used in the one-to-one communication request.

Optionally, the relay UE allocates the second part identifier to the at least one remote UE, and further includes: if the one-to-one communication request includes the information of the non-layer 2 identifier, the Relay UE will be the one-to-one The non-layer 2 identification information included in the communication request for identifying the Remote UE is placed in the one-to-one communication setup message.

Optionally, the relay UE allocates the second part identifier to the at least one remote UE, and the method further includes: if the source layer 2 identifiers in the one-to-one communication request message sent by different remote UEs are the same, the relay UE passes the pair A communication setup message assigns a second partial identity to a plurality of Remote UEs.

Optionally, the first part identifier of the Relay UE is different from the first part identifier of the same cell and other Relay UEs of the neighboring cell; or the first part of the Relay UE identifies the same base station and other Relay UEs of the neighboring base station. The first part of the identifier is different; or the Relay UE is different from the first part identifier of other Relay UEs activated in the network.

Optionally, before the determining, by the Relay UE, the first layer 2 identifier, the relay UE determines that the network side trigger layer 2 identifies the redistribution or determines that the layer 2 identifier redistribution condition is satisfied.

Another method for performing data transmission according to an embodiment of the present invention, the method includes: determining, by a Remote UE, a second layer 2 identifier;

The remote UE uses the second layer 2 identifier to perform data transmission with the Relay UE identified by using the first layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same network side The first part of the identifier is identified, and the second layer 2 identifier further includes a second part identifier that is allocated by the Relay UE, where the first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific identifier of the Remote UE.

Optionally, before the remote UE determines the identifier of the second layer 2, the method further includes: determining, by the remote UE, the first layer identifier of the relay UE by using the first layer 2 identifier that is broadcast by the relay UE.

Optionally, the Remote UE determines the first part identifier of the Relay UE by using information that is used by the Relay UE to indicate the number of bits occupied by the first part identifier in the first layer 2 identifier.

Optionally, before the remote UE determines the second layer 2 identifier, the method further includes: the Remote UE to the Relay UE Sending a one-to-one communication request, so that the Relay UE allocates a second part identifier to the Remote UE;

The source layer 2 used by the one-to-one communication request is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier, and the third layer 2 identifier includes the same identifier as the first layer 2 identifier. A portion of the identifier and a second portion identifier, the second portion being identified as a fixed value or assigned by the Remote UE.

Optionally, the Remote UE sends a one-to-one communication request to the Relay UE, and the method further includes: the Remote UE placing the non-layer 2 identification information used to identify the Remote UE in the one-to-one communication request.

Optionally, before the determining, by the remote UE, the second layer 2 identifier, the method further includes: the remote UE determining, according to the received one-to-one communication setup message from the relay UE, that the relay UE is allocated to the remote UE. The second part of the logo.

Optionally, before the remote UE determines the second layer 2 identifier, the method further includes: the Remote UE determines that a Relay UE reselection is required.

A Relay UE that performs data transmission according to an embodiment of the present invention, where the Relay UE includes:

a first determining module, configured to determine a first layer 2 identifier;

a first processing module, configured to use the first layer 2 identifier to perform data transmission with a Remote UE identified by using the second layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .

Optionally, the first determining module is specifically configured to: request a specific identifier from the network side, and use the layer 2 identifier assigned by the network side as the first layer 2 identifier; or request a specific identifier from the network side, and according to the pre-configuration The second part identifier is combined with the first part identifier allocated by the network side into the first layer 2 identifier; or the specific identifier is requested from the network side, and the second part identifier assigned by the Relay UE and the first part identifier allocated by the network side are The first layer 2 logo is synthesized.

Optionally, the first processing module is further configured to: after receiving the one-to-one communication request of the Remote UE, before using the first layer 2 identifier to perform data transmission with the Remote UE identified by using the second layer 2, The second part identifier is assigned to the Remote UE.

Optionally, the first processing module is specifically configured to: allocate a second part identifier to the remote UE by using a one-to-one communication setup message; where the source layer 2 in the one-to-one communication setup message is identified as the The layer 2 identifier is identified by the destination layer 2 as the source layer 2 identifier used in the one-to-one communication request.

Optionally, the first processing module is specifically configured to: if the one-to-one communication request includes the information that is not the layer 2 identifier, the one that is included in the one-to-one communication request is used to identify the Remote UE. The non-layer 2 identification information is placed in the one-to-one communication setup message.

Optionally, the first processing module is further configured to: if the source layer 2 identifiers in the one-to-one communication request message sent by different remote UEs are the same, assign a second to the plurality of remote UEs by using a one-to-one communication setup message. Partial identification.

Optionally, the first part of the Relay UE is identified by the same cell and other Relay UEs of the neighboring cell. The first part identifier is different; or the first part identifier of the Relay UE is different from the first part identifier of the same base station and other Relay UEs of the neighboring base station; or the first part identifier of the Relay UE and other Relay UEs activated in the network different.

Optionally, the first determining module is further configured to determine the first layer 2 identifier after determining that the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identity reallocation condition is met.

A Remote UE that performs data transmission according to an embodiment of the present invention, where the Remote UE includes:

a second determining module, configured to determine the second layer 2 identifier;

a second processing module, configured to use the second layer 2 identifier to perform data transmission with a Relay UE identified by using the first layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .

Optionally, the second processing module is further configured to: send a one-to-one communication request to the Relay UE, so that the Relay UE allocates a second part identifier to the Remote UE; where the one-to-one communication request The source layer 2 is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier, and the third layer 2 identifier includes the first portion identifier and the second portion identifier that are the same as the first layer 2 identifier. The second part is identified as a fixed value or assigned by the Remote UE.

Optionally, the second processing module is further configured to: place the non-layer 2 identification information used to identify the Remote UE into the one-to-one communication request.

Optionally, the second processing module is further configured to: determine, according to the received one-to-one communication setup message from the Relay UE, the second part identifier that is allocated by the Relay UE to the Remote UE.

Optionally, the second determining module is further configured to determine the second layer 2 identifier after determining that the Relay UE reselection needs to be performed.

a processor for reading a program in the memory, performing the following process: determining a first layer 2 identifier; using the first layer 2 identifier by the transceiver to perform data transmission with the Remote UE identified by the second layer 2; the transceiver For receiving and transmitting data under the control of the processor; wherein the first layer 2 identifier and the second layer 2 identifier include the same first part identifier assigned by the network side, and the second layer The identifier 2 further includes a second part identifier that is allocated by the Relay UE, where the first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific identifier of the Remote UE.

Optionally, the processor is specifically configured to: request a specific identifier from the network side, and use the layer 2 identifier assigned by the network side as the first layer 2 identifier; or request a specific identifier from the network side, and according to the pre-configured The two-part identifier is combined with the first part identifier assigned by the network side into the first layer 2 identifier; or, the specific identifier is requested from the network side, and the second part identifier allocated by the Relay UE is combined with the first part identifier assigned by the network side. The first layer 2 is identified.

Optionally, the processor is further configured to: before the data transmission by using the first layer 2 identifier and the Remote UE identified by using the second layer 2, broadcast the first layer 2 identifier by using a transceiver, to notify the remote UE. The specific identifier of the Relay UE.

Optionally, the processor is further configured to instruct the transceiver to broadcast information used to indicate the number of bits occupied by the first part identifier in the first layer 2 identifier.

Optionally, the processor is further configured to: before the data transmission by using the first layer 2 identifier and the Remote UE identified by using the second layer 2, after receiving the one-to-one communication request of the Remote UE, the remote is The UE allocates a second part identifier.

Optionally, the processor is specifically configured to: allocate a second part identifier to the remote UE by using a one-to-one communication setup message; where the source layer 2 in the one-to-one communication setup message is identified as the first layer 2, the destination layer 2 is identified as the source layer 2 identifier used in the one-to-one communication request.

Optionally, the processor is further configured to: if the one-to-one communication request includes information that is not the layer 2 identifier, use the non-layer communication request included in the one-to-one communication request to identify the remote UE The layer 2 identification information is placed in the one-to-one communication setup message.

Optionally, the processor is further configured to: if the source layer 2 identifiers in the one-to-one communication request message sent by different remote UEs are the same, assign the second part identifier to the plurality of remote UEs by using a one-to-one communication setup message. .

Optionally, the processor is further configured to determine the first layer 2 identifier after determining that the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identity reallocation condition is met.

a processor, configured to read a program in the memory, perform the following process: determining a second layer 2 identifier; using the second layer 2 identifier by the transceiver to perform data transmission with the Relay UE identified by using the first layer 2; The first layer 2 identifier and the second layer 2 identifier include the same first part identifier assigned by the network side, and the second layer 2 identifier further includes a second part identifier allocated by the Relay UE, One part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific identifier of the Remote UE.

Optionally, the processor is further configured to determine, by using the first layer 2 identifier broadcast by the Relay UE, the first part identifier of the Relay UE before determining the identifier of the second layer 2.

Optionally, the processor is specifically configured to: determine, by using the information that is used by the relay UE to indicate the number of bits occupied by the first part identifier in the identifier of the first layer 2, determine the identifier of the first layer 2 identifier. The first part identifier of the Relay UE.

Optionally, the processor is further configured to: send a one-to-one communication request to the Relay UE, so that the Relay UE allocates a second part identifier to the Remote UE, where the one-to-one communication request is used. The source layer 2 is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier, and the third layer 2 identifier includes the first portion identifier and the second portion identifier that are the same as the first layer 2 identifier. The two parts are identified as fixed values or assigned by the Remote UE.

Optionally, the processor is further configured to: place the non-layer 2 identification information used to identify the Remote UE in the one-to-one communication request.

Optionally, the processor is further configured to: determine, according to the received one-to-one communication setup message from the Relay UE, the second part identifier that is allocated by the Relay UE to the Remote UE.

Optionally, the processor is further configured to determine the second layer 2 identifier after determining that the Relay UE reselection is required.

In the embodiment of the present invention, the Relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2. The first layer 2 identifier and the second layer 2 identifier include the same first part identifier allocated by the network side, and the second layer 2 identifier further includes a second part identifier allocated by the Relay UE, The first part is identified as the specific identifier of the Relay UE, and the second part is identified as the specific identifier of the Remote UE, so that the identifier of the PC5 interface is unique within a certain range, and the identifier of the PC5 interface is prevented from colliding within a certain range, thereby ensuring the identifier of the PC5 interface. Can be applied to the UE to Network Relay scenario; further improving system performance.

DRAWINGS

1A is a schematic diagram of data of user equipment communication in a cellular network in the background art;

1B is a schematic diagram of data of a terminal direct connection communication in the background art;

1C is a schematic diagram of a UE-to-Network Relay in the background art;

1D is a schematic diagram of a UE-to-UE Relay in the background art;

2 is a schematic structural diagram of a system for performing data transmission according to an embodiment of the present invention;

3 is a schematic structural diagram of a first Relay UE according to an embodiment of the present invention;

4 is a schematic structural diagram of a first Remote UE according to an embodiment of the present invention;

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

6 is a schematic structural diagram of a second Remote UE according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart of a first method for performing data transmission according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic flowchart of a second method for performing data transmission according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic flowchart of a method for performing data transmission according to Embodiment 1 of the present invention; FIG.

10 is a schematic flowchart of a method for performing data transmission according to Embodiment 2 of the present invention;

FIG. 11 is a schematic flowchart of a method for performing data transmission according to Embodiment 3 of the present invention.

detailed description

In the embodiment of the present invention, the Relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2. Since the first layer 2 identifier and the second layer 2 identifier include the same number assigned by the network side A part of the identifier, and the second layer 2 identifier further includes a second part identifier that is allocated by the Relay UE, where the first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific identifier of the Remote UE, so that the identifier of the PC5 interface is It is unique within a certain range, and the identifier of the PC5 interface is prevented from colliding within a certain range, so that the identifier of the PC5 interface can be applied to the UE to Network Relay scenario; the system performance is further improved.

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

As shown in FIG. 2, the system for performing data transmission in the embodiment of the present invention includes: a Relay UE 10 and a Remote UE 20.

The Relay UE 10 is configured to determine a first layer 2 identifier, and use the first layer 2 identifier to perform data transmission with a Remote UE identified by using the second layer 2;

a remote UE 20, configured to determine a second layer 2 identifier, and use the second layer 2 identifier to perform data transmission with a Relay UE identified by using the first layer 2;

The first layer 2 identifier and the second layer 2 identifier include the same first part identifier assigned by the network side, and the second layer 2 identifier further includes a second part identifier allocated by the Relay UE. The first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific identifier of the Remote UE.

In the embodiment of the present invention, the first layer 2 identifier of the Relay UE includes a two-part identifier, where the first part identifier is a specific identifier of the Relay UE allocated by the network side, and the second part identifier is allocated or pre-set by the network side or the Relay UE allocates itself.

Specifically, the Relay UE requests a specific identifier from the network side, and identifies the layer 2 identifier assigned by the network side as the first layer 2 identifier; or the Relay UE requests a specific identifier from the network side, and according to the pre-configured second The partial identifier is combined with the first part identifier assigned by the network side into a first layer 2 identifier, where the pre-configuration may be specified in the protocol; or the Relay UE requests a specific identifier from the network side, and allocates the The two-part identification is combined with the first part identification assigned by the network side into a first layer 2 identifier.

The second layer 2 identifier of the remote UE of the embodiment of the present invention includes a two-part identifier, where the first part identifier is a specific identifier of the Relay UE allocated by the network side, and the second part identifier is a specific identifier of the Remote UE. The first part of the second layer 2 identifier of the Remote UE identifier is the same as the first part identifier of the first layer 2 identifier of the Relay UE that performs the transmission.

In the implementation, the length and location of the first part identifier and the second part identifier in the layer 2 identifier may be flexibly configured, for example, the high M bit may be specified as the first part identifier, and the low (NM) bit may be the second part identifier; The high M bit is the second part identification and the low (NM) bit is the first part identification.

In the case where the lengths of the first part identifier and the second part identifier are not fixed, the Relay UE may indicate in the discovery message which bits the Remote UE is to use the same value as the Relay UE. For example, the high M bit is the first part identifier, and the low (NM) bit is the second part identifier. In the discovery message, 5 bits are used to indicate which digits are the same as the Relay UE. If the high order is the same as the Remote UE and the Relay UE, the following can be used. '10000' indicates that the upper 16 bits are the same as the Relay UE, and '10100' indicates that the upper 20 bits are the same as the Relay UE.

For the case where the lengths of the first part identifier and the second part identifier are fixed, the Remote UE uses the same value as the Relay UE by default when the one-to-one communication request with the Relay UE is initiated.

In the implementation, since the first part identifier in the second layer 2 identifier of the Remote UE is the same as the first part identifier in the first layer 2 identifier of the Relay UE, the Remote UE needs to know the first layer in the first layer 2 identifier of the Relay UE. Part of the logo. There are many ways to know specifically, for example, the Remote UE can be notified by the network side. For convenience of presentation, the subsequent embodiment takes hexadecimal as an example.

The embodiment of the present invention further provides a learning mode: the Relay UE broadcasts the first layer 2 identifier; correspondingly, the Remote UE determines the first part identifier in the first layer 2 identifier of the Relay UE according to the broadcast.

Since the first layer 2 identifier includes other identifiers in addition to the first portion identifier, the other identifiers are fixed values or allocated by the Relay UE or allocated by the network side. If the number of bits of the first part identifier and other identifiers is not fixed, the Relay UE needs to carry the number of bits used to indicate the first part identifier in the first layer 2 identifier. Correspondingly, according to the information indicating the number of bits occupied by the first part identifier in the identifier of the first layer 2, the Remote UE can find out which bits are the first part from the first layer 2 identifier received through the broadcast. Logo.

For example, F00000H is the first layer 2 identifier, where F000H is the first part identifier, and the information indicating the number of bits occupied by the first part identifier in the identifier of the first layer 2 is 16 bits.

Optionally, if the Remote UE finds and selects a Relay UE in the discovery process, the remote UE may send a one-to-one communication request to the Relay UE, so that the Relay UE allocates the second part identifier to the Remote UE. The source layer 2 used by the one-to-one communication request is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier of the Relay UE, and the third layer 2 identifier is the same as the identifier of the first layer 2 The first part identifier and the second part identifier are composed, and the second part identifier is a fixed value or is allocated by the Remote UE.

For example, the first layer 2 of the Relay UE is identified as F00000H, where F000H is the first part identifier, 00H is the second part identifier, and the third layer 2 identifier may be F0000CH, where F000H is the same as the first part identifier, and 0CH is a fixed value or The value assigned by the Remote UE.

Correspondingly, after receiving the one-to-one communication request of the Remote UE, the Relay UE allocates a second part identifier to the Remote UE.

Optionally, the Relay UE may allocate a second part identifier to the Remote UE by using a one-to-one communication setup message.

The source layer 2 in the one-to-one communication setup message is identified as the first layer 2 identifier, and the destination layer 2 is identified as the source layer 2 identifier used in the one-to-one communication request (ie, the third layer 2 logo).

For example, in the one-to-one communication request, the source layer 2 is identified as F0000CH, and the first layer 2 is identified as F00000H. The source layer 2 in the one-to-one communication setup message is identified as F00000H, and the destination layer 2 is identified as F0000CH, and the relay UE is also carried. The second part of the identifier assigned to the Remote UE.

The allocation method can be random allocation; or an identifier can be selected from the unused (available) identification set. Remote UE, in general, the Relay UE selects a flag from the unused (available) identifier set, and the identifier is deleted from the unused (available) identifier set, and is not connected to the Relay UE in a Remote UE (for example, the connection is released. After switching, the identifier assigned to the Remote UE is added to the unused (available) identifier set. It is also possible to use a status indication that the assigned identifier is marked as used.

It should be noted that the foregoing method for allocating the second part identifier to the remote UE by using the one-to-one communication setup message is only an example, and other manners for notifying the allocated second part identifier to the remote UE are applicable to the embodiment of the present invention.

In the implementation, it is possible that the third layer 2 identifiers of the plurality of remote UEs are the same. In order to distinguish different remote UEs, the embodiment of the present invention provides a solution: the Remote UE is used to identify the Remote UE. The non-layer 2 identification information is placed in the one-to-one communication request; correspondingly, if the one-to-one communication request includes information not identified by the layer 2, the Relay UE will send the one-to-one communication request The non-layer 2 identification information included in the identifier for identifying the Remote UE is placed in the one-to-one communication setup message.

Optionally, the non-layer 2 identifier information of the embodiment of the present invention is information that can distinguish different Remote UEs, such as an International Mobile Subscriber Identity (IMSI), and a fixed bit length that can also be generated by the Remote UE. random number.

If the source layer 2 identifiers in the one-to-one communication request message sent by the different remote UEs are the same (that is, the third layer 2 identifiers of the plurality of remote UEs are the same), the relay UE establishes the message as multiple remotes through one-to-one communication. The UE allocates the second part identifier, and the second part identifier of the different Remote UEs can be identified by the information identified by the non-layer 2, and broadcasted.

For example, the source layer 2 identifiers in the one-to-one communication setup message sent by the remote UE1 and the remote UE2 are all F0000CH, and the information of the non-layer 2 identifier in the one-to-one communication setup message sent by the remote UE1 is 0010, and the one sent by the remote UE2 is The information of the non-layer 2 identifier in the communication setup message is 0011, the second part identifier assigned by the Relay UE to the Remote UE1 is 01, and the second part identifier assigned to the Remote UE1 is 10, and the Relay UE may set the 0010 and the 01. Bind, broadcast 0011 and 10 after binding (the non-layer 2 identifier here is in binary);

Correspondingly, the Remote UE1 can find the corresponding 01 according to 0010; the Remote UE2 can find the corresponding 10 according to 0011.

In the implementation, the Remote UE may select the Relay UE through the discovery process and perform the foregoing process when the connection needs to be established with the Relay UE, or may select the Relay UE through the discovery process when the other Relay UE needs to be reselected, and perform the foregoing. process.

Corresponding to the Relay UE, the first layer 2 identifier may be broadcasted periodically, or the identifier redistribution may be triggered when the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identifier reassignment condition is satisfied.

The reconfiguration conditions here can be set as needed. For example, for the case where the same cell and the neighboring cell are unique, the identity redistribution is triggered when the Relay UE switches. For the case where the same eNB (evolved base station) and the neighboring eNB are unique, the identity re-allocation is triggered when the Relay UE crosses the eNB. For the only situation in the entire network, No reconfiguration is required.

Optionally, in order to ensure that the first part identifier of the first layer 2 identifier of the relay UE is unique within a certain range, the first part identifier of the Relay UE allocated by the network side in the embodiment of the present invention is the same cell and the neighboring cell. The first part identifier of the other Relay UEs is different; or the first part identifier of the Relay UE is different from the first part identifier of the same base station and other Relay UEs of the neighboring base station; or the Relay UE and other Relays activated in the network The first part of the UE is identified differently.

Optionally, the network side may also allocate the first part identifier to the Relay UE according to the absolute geographic area. For example, the Relay UE is different from the first part identifier of other Relay UEs in a certain geographical area.

As shown in FIG. 3, the first Relay UE in the embodiment of the present invention includes:

a first determining module 300, configured to determine a first layer 2 identifier;

The first processing module 301 is configured to perform data transmission by using the first layer 2 identifier and the Remote UE identified by using the second layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same And the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific part of the Remote UE. Logo.

Optionally, the first determining module 300 is specifically configured to: request a specific identifier from the network side, and use the layer 2 identifier assigned by the network side as the first layer 2 identifier; or request a specific identifier from the network side, and according to the pre The second part identifier of the configuration is combined with the first part identifier assigned by the network side into the first layer 2 identifier; or the specific identifier is requested from the network side, and the second part identifier allocated by the Relay UE and the first part allocated by the network side are The logos are combined into a first layer 2 logo.

Optionally, the first processing module 301 is further configured to: before the data transmission by using the first layer 2 identifier and the Remote UE identified by using the second layer 2, broadcast the first layer 2 identifier to notify the remote UE The specific identifier of the Relay UE.

Optionally, the first processing module 301 is further configured to: broadcast information used to indicate the number of bits occupied by the first part identifier in the identifier of the first layer 2.

Optionally, the first processing module 301 is further configured to: after using the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2, after receiving the one-to-one communication request of the Remote UE, , the second part identifier is assigned to the Remote UE.

Optionally, the first processing module 301 is specifically configured to: allocate a second part identifier to the remote UE by using a one-to-one communication setup message; where the source layer 2 in the one-to-one communication setup message is identified as The first layer 2 is identified, and the destination layer 2 is identified as the source layer 2 identifier used in the one-to-one communication request.

Optionally, the first processing module 301 is specifically configured to: if the one-to-one communication request includes information that is not the layer 2 identifier, use the one that is included in the one-to-one communication request to identify the remote The non-layer 2 identification information of the UE is placed in the one-to-one communication setup message.

Optionally, the first processing module 301 is further configured to: if a one-to-one communication request sent by different Remote UEs is cancelled If the source layer 2 identifiers in the information are the same, the second part identifiers are allocated to the plurality of Remote UEs through the one-to-one communication setup message.

Optionally, the first processing module 301 is further configured to determine the first layer 2 identifier after determining that the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identity reallocation condition is met.

As shown in FIG. 4, the first type of Remote UE in the embodiment of the present invention includes:

a second determining module 400, configured to determine a second layer 2 identifier;

a second processing module 401, configured to use the second layer 2 identifier to perform data transmission with a Relay UE identified by using the first layer 2, where the first layer 2 identifier and the second layer 2 identifier include the same And the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific part of the Remote UE. Logo.

Optionally, the second processing module 401 is further configured to: determine, by using the first layer 2 identifier that is broadcast by the Relay UE, the first part identifier of the Relay UE.

Optionally, the first part identifier of the Relay UE is determined by using information that is used by the Relay UE to indicate the number of bits occupied by the first part identifier in the first layer 2 identifier.

Optionally, the second processing module 401 is further configured to: send a one-to-one communication request to the Relay UE, so that the Relay UE allocates a second part identifier to the Remote UE; wherein the one-to-one communication The source layer 2 of the request is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier, and the third layer 2 identifier includes the first part identifier and the second part identifier that are the same as the first layer 2 identifier. The second portion is identified as a fixed value or assigned by the Remote UE.

Optionally, the second processing module 401 is further configured to: place the non-layer 2 identification information used to identify the Remote UE into the one-to-one communication request.

Optionally, the second processing module 401 is further configured to: determine, according to the received one-to-one communication setup message from the Relay UE, the second part identifier that is allocated by the Relay UE to the Remote UE.

Optionally, the second determining module 400 is further configured to determine the second layer 2 identifier after determining that the Relay UE reselection needs to be performed.

In the implementation, for different application scenarios, the Relay UE of FIG. 3 may also be the Remote UE of FIG. 4; the Remote UE of FIG. 4 may also be the Relay UE of FIG. 3, so the functions of the Relay UE and the Remote UE may be combined in one. In the entity (that is, the modules of the Relay UE and the Remote UE are in one entity), the function of the Relay UE or the function of the Remote UE is selected as needed.

In an implementation, the Relay UE of FIG. 3 may also be the Remote UE of FIG. 4 for different application scenarios; The Remote UE of 4 may also be the Relay UE of FIG. 3, so the functions of the Relay UE and the Remote UE may be combined in one entity (ie, the modules of the Relay UE and the Remote UE are in one entity), and the function of using the Relay UE is selected according to the need. Or the function of the Remote UE.

As shown in FIG. 5, the second Relay UE of the embodiment of the present invention includes: a processor 501, configured to read a program in the memory 504, and perform the following process: determining a first layer 2 identifier; using the transceiver 502 to use the The layer 2 identifies the data transmission with the Remote UE identified by the second layer 2; the transceiver 502 is configured to receive and transmit data under the control of the processor 501.

Optionally, the processor 501 is specifically configured to: request a specific identifier from the network side, and use the layer 2 identifier assigned by the network side as the first layer 2 identifier; or request a specific identifier from the network side, and according to the pre-configured The second part identifier is combined with the first part identifier allocated by the network side into the first layer 2 identifier; or, the specific identifier is requested from the network side, and the second part identifier allocated by the Relay UE is combined with the first part identifier allocated by the network side. Into the first layer 2 logo.

Optionally, the processor 501 is further configured to: before the data transmission by using the first layer 2 identifier and the Remote UE identified by using the second layer 2, broadcast the first layer 2 identifier to notify the Remote UE of the Relay. The specific identity of the UE.

Optionally, the first layer 2 identifier further includes other identifiers, where the other identifiers are fixed values or allocated by the Relay UE or allocated by the network side.

Optionally, the processor 501 is further configured to: broadcast information used to indicate the number of bits occupied by the first part identifier in the first layer 2 identifier.

Optionally, the processor 501 is further configured to: after using the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2, after receiving the one-to-one communication request of the Remote UE, The Remote UE allocates a second part identifier.

Optionally, the processor 501 is specifically configured to: allocate a second part identifier to the remote UE by using a one-to-one communication setup message; where the source layer 2 in the one-to-one communication setup message is identified as the first Layer 2 identifies that destination layer 2 identifies the source layer 2 identity used in the one-to-one communication request.

Optionally, the processor 501 is specifically configured to: if the one-to-one communication request includes the information that is not the layer 2 identifier, the information that is included in the one-to-one communication request is used to identify the remote UE. The non-layer 2 identification information is placed in the one-to-one communication setup message.

Optionally, the processor 501 is further configured to: if the source layer 2 identifiers in the one-to-one communication request message sent by different remote UEs are the same, allocate the second part to the plurality of remote UEs by using a one-to-one communication setup message. Logo.

Optionally, the first part identifier of the Relay UE is different from the first part identifier of the same cell and other Relay UEs of the neighboring cell; or the first part identifier of the Relay UE is the same as the same base station and other neighboring base stations. The first part identifier of the Relay UE is different; or the Relay UE is different from the first part identifier of other Relay UEs activated in the network.

Optionally, the processor 501 is further configured to determine the first layer 2 identifier after determining that the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identifier reassignment condition is met.

In FIG. 5, a bus architecture (represented by bus 500), bus 500 may include any number of interconnected buses and bridges, and bus 500 will include one or more processors and memory 504 represented by general purpose processor 501. The various circuits of the memory are linked together. The bus 500 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. Bus interface 503 provides an interface between bus 500 and transceiver 502. Transceiver 502 can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, transceiver 502 receives external data from other devices. The transceiver 502 is configured to send the processed data of the processor 501 to other devices. Depending on the nature of the computing system, a user interface 505 can also be provided, such as a keypad, display, speaker, microphone, joystick. The processor 501 is responsible for managing the bus 500 and the usual processing, running a general purpose operating system as described above. The memory 504 can be used to store data used by the processor 501 when performing operations. Optionally, the processor 501 may be a CPU (Central Embedded Device), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device). , complex programmable logic devices).

As shown in FIG. 6, the second remote UE of the embodiment of the present invention includes: a processor 601, configured to read a program in the memory 604, and perform the following process: determining a second layer 2 identifier; using the transceiver 602 to use the The second layer 2 identifier is used for data transmission by using the relay UE identified by the first layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same first part identifier assigned by the network side, and The second layer 2 identifier further includes a second part identifier that is allocated by the Relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE.

The transceiver 602 is configured to receive and transmit data under the control of the processor 601.

Optionally, the processor 601 is further configured to: determine, by using the first layer 2 identifier that is broadcast by the Relay UE, the first part identifier of the Relay UE, where the first layer 2 identifier further includes a relay UE The second part outside the specific identifier and the information indicating the number of bits occupied by the first part identifier in the first layer 2 identifier.

Optionally, the processor 601 is further configured to: send a one-to-one communication request to the Relay UE, so that the Relay UE allocates a second part identifier to the Remote UE; where the one-to-one communication request is used. The source layer 2 is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier, and the third layer 2 identifier includes the first portion identifier and the second portion identifier that are the same as the first layer 2 identifier. The second part is identified as a fixed value or assigned by the Remote UE.

Optionally, the processor 601 is further configured to: place the non-layer 2 identification information used to identify the Remote UE. The one-to-one communication request.

Optionally, the processor 601 is further configured to: determine, according to the received one-to-one communication setup message from the Relay UE, the second part identifier that is allocated by the Relay UE to the Remote UE.

Optionally, the processor 601 is further configured to determine the second layer 2 identifier after determining that the Relay UE reselection is required.

In FIG. 6, a bus architecture (represented by bus 600), bus 600 may include any number of interconnected buses and bridges, and bus 600 will include one or more processors and memory 604 represented by general purpose processor 601. The various circuits of the memory are linked together. The bus 600 can also link various other circuits, such as peripherals, voltage regulators, and power management circuits, as is known in the art, and therefore, will not be further described herein. Bus interface 603 provides an interface between bus 600 and transceiver 602. Transceiver 602 can be an element or a plurality of elements, such as a plurality of receivers and transmitters, providing means for communicating with various other devices on a transmission medium. For example, transceiver 602 receives external data from other devices. The transceiver 602 is configured to send the processed data of the processor 601 to other devices. Depending on the nature of the computing system, a user interface 605 can also be provided, such as a keypad, display, speaker, microphone, joystick. The processor 601 is responsible for managing the bus 600 and the usual processing, running a general purpose operating system as described above. The memory 604 can be used to store data used by the processor 601 in performing operations. Optionally, the processor 601 can be a CPU, an ASIC, an FPGA, or a CPLD.

In the implementation, the Relay UE may also function as a Remote UE for different application scenarios; the Remote UE may also function as a Relay UE, so the functions of the Relay UE and the Remote UE may be combined in one entity (ie, the modules of the Relay UE and the Remote UE are in the In an entity, the function of the Relay UE or the function of the Remote UE is selected as needed.

In the implementation, for different application scenarios, the Relay UE of FIG. 5 may also be the Remote UE of FIG. 6; the Remote UE of FIG. 6 may also be the Relay UE of FIG. 5, so the functions of the Relay UE and the Remote UE may be combined into one. In the entity (that is, the modules of the Relay UE and the Remote UE are in one entity), the function of the Relay UE or the function of the Remote UE is selected as needed.

Based on the same inventive concept, the embodiment of the present invention further provides a method for performing data transmission. The device corresponding to the method is a Relay UE in a system for performing data transmission according to an embodiment of the present invention, and the method solves the problem. The device is similar, so the implementation of the method can be referred to the implementation of the device, and the repeated description will not be repeated.

As shown in FIG. 7, the first method for performing data transmission in the embodiment of the present invention includes:

Step 700: The Relay UE determines the identifier of the first layer 2;

Step 701: The Relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by using the second layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .

Optionally, before the relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by using the second layer 2, the method further includes: the Relay UE broadcasts the first layer 2 identifier to notify the remote UE The specific identifier of the Relay UE.

Based on the same inventive concept, a method for performing data transmission is also provided in the embodiment of the present invention. The device corresponding to the method is a Remote UE in a system for performing data transmission according to an embodiment of the present invention, and the method solves the problem. The principle is similar to the device, so the implementation of the method can be referred to the implementation of the device, and the details are not repeated here.

As shown in FIG. 8, the second method for performing data transmission in the embodiment of the present invention includes:

Step 800: The Remote UE determines the identifier of the second layer 2;

Step 801: The Remote UE uses the second layer 2 identifier to perform data transmission with the Relay UE identified by using the first layer 2, where the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .

Optionally, the first layer 2 identifier further includes a second part other than the specific identifier of the Relay UE.

Optionally, before the determining, by the remote UE, the second layer 2 identifier, the method further includes: the remote UE sending a one-to-one communication request to the relay UE, so that the relay UE allocates the second part identifier to the remote UE;

Optionally, the remote UE sends a one-to-one communication request to the relay UE by using the third layer 2 identifier, and the method further includes: the remote UE placing the non-layer 2 identification information used to identify the remote UE in the one For a communication request.

The scheme of the present invention will be described below by way of a few examples.

Embodiment 1:

It is assumed that the network element identified by the Relay UE allocation layer 2 is a DPF (Direct Provisioning Function) device. The layer 2 identifier has a total length of 24 bits, the first part includes a high 16 bits, and the second part includes a lower 8 bits. The second part of the Layer 2 identity of the Relay UE is fixed to all zeros. The Remote UE initiates a one-to-one communication request using the second portion fixed to '01'.

In the embodiment, the Remote UE1 is within the coverage of the Relay UE1, and the Remote UE1 selects the Relay UE1 as the Relay UE of its access network. Remote UE2 is within the coverage of Relay UE2, and Remote UE2 selects Relay. UE2 acts as the Relay UE of its access network.

As shown in FIG. 9, the method for performing data transmission in Embodiment 1 of the present invention includes:

Step 1: Relay UE1 sends a Relay UE layer 2 identity allocation request to the network element (DPF) responsible for allocating layer 2 identification.

Step 1a: Relay UE2 sends a Relay UE layer 2 identity allocation request to the network element (DPF) responsible for assigning layer 2 identification.

Step 2: The DPF assigns the first part identifier of the layer 2 identifier to the Relay UE1, and the first part identifier of the assigned Relay UE1 is expressed as ‘F000’ in hexadecimal.

Step 2a: The DPF assigns the first part identifier of the layer 2 identifier to the Relay UE2, and the first part identifier of the assigned Relay UE2 is expressed in hexadecimal notation as '0F00'.

Step 3: Relay UE1 sends a Relay discovery message on PC5, where the ProSe Relay UE ID carried in the discovery message sent by Relay UE1 is ‘F00000’.

Step 3a: Relay UE2 sends a Relay discovery message on PC5, where the ProSe Relay UE ID carried in the discovery message sent by Relay UE2 is '0F0000'.

Step 4: The Remote UE1 initiates a one-to-one communication request to the Relay UE1, where the source layer 2 of the communication request message sent by the Remote UE1 is identified as 'F00001', and the destination layer 2 is identified as 'F00000', and the message carries a 40-bit random Number '000000008B'.

Step 4a: The Remote UE2 initiates a one-to-one communication request to the Relay UE2, where the source layer 2 of the communication request message sent by the Remote UE2 is identified as '0F0001', and the destination layer 2 is identified as '0F0000', and the message carries a 40-bit random The number '0000560000'.

Step 5: Relay UE1 sends a one-to-one communication setup message to Remote UE1. The source layer 2 of the one-to-one communication setup message sent by the relay UE1 is identified as 'F00000', and the destination layer 2 is identified as 'F00001'. The message carries the UE identifier '000000008B' used by the Remote UE1 in step 4 and the relay UE1 is Remote. Layer 2 assigned by UE1 identifies the second portion '0C'.

Step 5a: Relay UE2 sends a one-to-one communication setup message to Remote UE2. The source layer 2 of the one-to-one communication setup message sent by the relay UE2 is identified as '0F0000', and the destination layer 2 is identified as '0F0001'. The message carries the UE identifier '0000560000' used by the Remote UE2 in step 4a and the relay UE2 is Remote. Layer 2 assigned by UE2 identifies the second part '0C'.

Step 6: Relay UE1 performs data transmission with Remote UE1, where layer 2 used by Relay UE1 is identified as 'F00000', and layer 2 used by Remote UE1 is identified as 'F0000C'.

Step 6a: Relay UE2 performs data transmission with Remote UE2, wherein layer 2 used by Relay UE2 is identified as '0F0000', and layer 2 used by Remote UE2 is identified as '0F000C'.

There is no necessary timing relationship between the above steps 1 and 1a, that is, step 1 can be performed first, and then step 1a is performed; Step 1a may also be performed first, and then step 1 may be performed; step 1 and step 1a may also be performed simultaneously. Similarly, there is no necessary timing relationship between step 2 and step 2a, step 3 and step 3a, step 4 and step 4a, step 5 and step 5a, and step 6 and step 6a.

Embodiment 2:

It is assumed that the network element identified by the Relay UE allocation layer 2 is a DPF (Direct Provisioning Function), and the layer 2 identifier has a total length of 24 bits, the first part includes a high 16 bits, and the second part includes a lower 8 bits. The second part of the Layer 2 identity of the Relay UE is fixed to all zeros. The Remote UE initiates a one-to-one communication request using the second portion fixed to '01'.

In the embodiment, both the Remote UE1 and the Remote UE2 are within the coverage of the Relay UE1, and both the Remote UE1 and the Remote UE2 select the Relay UE1 as the Relay UE of the access network.

As shown in FIG. 10, the method for performing data transmission in Embodiment 2 of the present invention includes:

Step 3: Relay UE1 sends a Relay discovery message on PC5, where the ProSe Relay UE ID carried in the discovery message sent by Relay UE1 is 'F00000'.

Step 4a: The Remote UE2 initiates a one-to-one communication request to the Relay UE1, where the source layer 2 of the communication request message sent by the Remote UE2 is identified as 'F00001', and the destination layer 2 is identified as 'F00000', and the message carries a 40-bit random The number '0000560000'.

Step 5: Relay UE1 sends a one-to-one communication setup message to Remote UE1 and Remote UE2. The source layer 2 of the one-to-one communication setup message sent by the relay UE1 is identified as 'F00000', and the destination layer 2 is identified as 'F00001'. The message carries the UE identifier '000000008B' used by the Remote UE1 in step 4 and the relay UE1 is Remote. The layer 2 identifier assigned by UE1 corresponds to the second part '0C', and corresponds to the UE identifier '0000560000' used by Remote UE2 in step 4a and the layer 2 identifier second part '09' assigned by Relay UE1 to Remote UE2.

Step 6a: Relay UE1 performs data transmission with Remote UE2, where layer 2 used by Relay UE1 is identified as 'F00000', and layer 2 used by Remote UE2 is identified as '0F0009'.

There is no necessary timing relationship between the above steps 1 and 1a, that is, step 1 may be performed first, and then step 1a may be performed; step 1a may be performed first, and then step 1 may be performed; step 1 and step 1a may also be performed simultaneously. Similarly, there is no necessary timing relationship between step 2 and step 2a, step 3 and step 3a, step 4 and step 4a, and step 6 and step 6a.

Embodiment 3:

It is assumed that the network element identified by the Relay UE allocation layer 2 is DPF, the total length of the layer 2 identifier is 24 bits, the first part includes the upper 16 bits, and the second part includes the lower 8 bits. The second part of the Layer 2 identity of the Relay UE is also assigned by the DPF. The Remote UE itself selects the second part of the layer 2 identity to initiate a one-to-one communication request.

In the embodiment, the Remote UE1 is within the coverage of the Relay UE1, and the Remote UE1 selects the Relay UE1 as the Relay UE of its access network. Remote UE2 is within the coverage of Relay UE2, and Remote UE2 selects Relay UE2 as the Relay UE of its access network.

As shown in FIG. 11, the method for performing data transmission in Embodiment 3 of the present invention includes:

Step 2: The DPF assigns a layer 2 identifier to the Relay UE1, and the layer 2 identifier of the assigned Relay UE1 is expressed in hexadecimal as 'F00006'.

Step 2a: The DPF allocates a layer 2 identifier for Relay UE2, and the first portion of the assigned Relay UE2 is represented by hexadecimal as '0F0009'.

Step 3: Relay UE1 sends a Relay discovery message on PC5, where the ProSe Relay UE ID carried in the discovery message sent by Relay UE1 is 'F00006'.

Step 3a: The Relay UE2 sends a Relay discovery message on the PC5, where the ProSe Relay UE ID carried in the discovery message sent by the Relay UE2 is '0F0009'.

Step 4: The remote UE1 initiates a one-to-one communication request to the Relay UE1, where the source layer 2 of the communication request message sent by the Remote UE1 is identified as 'F00021', and the upper 16 bits are the same as the Relay UE1, and the lower 8 bits are selected by the UE. The Remote UE cannot select the layer 2 identifier used by the Relay UE. Destination layer 2 is identified as 'F00006' and the message carries a 40-bit random number '000000008B'.

Step 4a: The Remote UE2 initiates a one-to-one communication request to the Relay UE2, where the Remote UE2 sends the communication. The source layer 2 of the message request message is identified as '0F000B', the upper 16 bits of which are the same as the Relay UE1, the lower 8 bits are selected by themselves, and the Remote UE cannot select the layer 2 identifier used by the Relay UE. The destination layer 2 is identified as '0F0009' and the message carries a 40-bit random number '0000560000'.

Step 5: Relay UE1 sends a one-to-one communication setup message to Remote UE1. The source layer 2 of the one-to-one communication setup message sent by the relay UE1 is identified as 'F00006', and the destination layer 2 is identified as 'F00021'. The message carries the UE identifier '000000008B' used by the Remote UE1 in step 4 and the relay UE1 is Remote. Layer 2 assigned by UE1 identifies the second portion '0C'.

Step 5a: Relay UE2 sends a one-to-one communication setup message to Remote UE2. The source layer 2 of the one-to-one communication setup message sent by the relay UE2 is identified as '0F0009', and the destination layer 2 is identified as '0F000B'. The message carries the UE identifier '0000560000' used by the Remote UE2 in step 4a and the relay UE2 is Remote. Layer 2 assigned by UE2 identifies the second part '0B'.

Step 6a: Relay UE2 performs data transmission with Remote UE2, wherein layer 2 used by Relay UE2 is identified as '0F0000', and layer 2 used by Remote UE2 is identified as '0F000B'.

Example 4:

After Embodiment 3, Relay UE1 and Remote UE1 are performing one-to-one communication, and Relay UE2 and Remote UE2 are performing one-to-one communication. With the movement of Relay UE2 and/or Remote UE2, Remote UE2 reselects Relay UE1 as Relay UE that communicates with the network.

The remote UE2 initiates a one-to-one communication request to the Relay UE1, and the source layer 2 of the communication request message sent by the Remote UE2 is identified as 'F00010', and its upper 16 bits are the same as the Relay UE1, and the lower 8 bits are selected by itself, and the Remote UE cannot select the same. The layer 2 identifier used by the Relay UE. Destination layer 2 is identified as 'F00006' and the message carries a 40-bit random number '0000560000'.

Relay UE1 sends a one-to-one communication setup message to Remote UE2. The source layer 2 of the one-to-one communication setup message sent by the relay UE1 is identified as 'F00006', and the destination layer 2 is identified as 'F00010'. The message carries the UE identifier '0000560000' used by the Remote UE1 in step 4 and the relay UE1 is Remote. Layer 2 assigned by UE2 identifies the second portion '10'.

The relay UE1 performs data transmission with the Remote UE1 and the Remote UE2, wherein the layer 2 used by the Relay UE1 is identified as 'F00000', the layer 2 used by the Remote UE1 is identified as 'F0000C', and the layer 2 used by the Remote UE2 is identified as 'F00010'.

It can be seen from the above that the Relay UE in the embodiment of the present invention uses the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2. The first layer 2 identifier and the second layer 2 identifier include the same first part identifier allocated by the network side, and the second layer 2 identifier further includes a second part allocated by the Relay UE. The sub-identification, the first part is identified as the specific identifier of the Relay UE, and the second part is identified as the specific identifier of the Remote UE, so that the identifier of the PC5 interface is unique within a certain range, and the identification of the PC5 interface is prevented from colliding within a certain range, thereby ensuring the PC5. The identifier of the interface can be applied to the UE to Network Relay scenario; the system performance is further improved.

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.

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. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

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.

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

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method for data transmission, characterized in that the method comprises:

The relay terminal Relay UE determines the first layer 2 identifier;

The relay UE uses the first layer 2 identifier to perform data transmission with the remote terminal Remote UE identified by the second layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .
The method according to claim 1, wherein the Relay UE determines the first layer 2 identifier, including:

The Relay UE requests a specific identifier from the network side, and identifies the layer 2 identifier assigned by the network side as the first layer 2 identifier;

Or the relay UE requests a specific identifier from the network side, and combines with the first part identifier allocated by the network side according to the pre-configured second part identifier into the first layer 2 identifier;

Or, the Relay UE requests a specific identifier from the network side, and combines the second part identifier allocated by the Relay UE with the first part identifier allocated by the network side into the first layer 2 identifier.
The method according to claim 2, wherein before the relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2, the method further includes:

The Relay UE broadcasts the first layer 2 identifier to notify the Remote UE of the specific identifier of the Relay UE.
The method according to claim 3, wherein the Relay UE further broadcasts information indicating the number of bits occupied by the first part identifier in the first layer 2 identifier.
The method according to claim 1, wherein before the relay UE uses the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2, the method further includes: the Relay UE receiving After the one-to-one communication request of the Remote UE, the second part identifier is assigned to the Remote UE.
The method according to claim 5, wherein the Relay UE allocates a second part identifier to the at least one Remote UE, including:

The relay UE allocates a second part identifier to the remote UE by using a one-to-one communication setup message, where the source layer 2 in the one-to-one communication setup message is identified as the first layer 2 identifier, and the destination layer 2 is identified as The source layer 2 identifier used in the one-to-one communication request.
The method according to claim 6, wherein the relay UE allocates the second part identifier to the at least one remote UE, and further includes: if the one-to-one communication request includes the information of the non-layer 2 identifier, The Relay UE places the non-layer 2 identification information included in the one-to-one communication request for identifying the Remote UE in the one-to-one communication setup message.
The method according to claim 5, wherein the relay UE allocates the second part identifier to the at least one Remote UE, and further includes:

If the source layer 2 identifiers in the one-to-one communication request message sent by different Remote UEs are the same, the Relay UE Assigning a second partial identifier to a plurality of Remote UEs through a one-to-one communication setup message.
The method according to any one of claims 1 to 8, wherein the first part identifier of the Relay UE is different from the first part identifier of another Relay UE of the same cell and the neighboring cell; or

The first part identifier of the Relay UE is different from the first part identifier of the same base station and other Relay UEs of the neighboring base station; or

The Relay UE is different from the first part identifier of other Relay UEs activated in the network.
The method according to any one of claims 1 to 8, wherein before the relay UE determines the identifier of the first layer 2, the method further includes:

The Relay UE determines that the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identification reassignment condition is satisfied.
A method for data transmission, characterized in that the method comprises:

The Remote UE determines the second layer 2 identifier;

The remote UE uses the second layer 2 identifier to perform data transmission with the Relay UE identified by using the first layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same network side The first part of the identifier is identified, and the second layer 2 identifier further includes a second part identifier that is allocated by the Relay UE, where the first part is identified as a specific identifier of the Relay UE, and the second part is identified as a specific identifier of the Remote UE.
The method according to claim 11, wherein before the remote UE determines the identifier of the second layer 2, the method further includes: determining, by the remote UE, the first layer 2 identifier broadcast by the relay UE, determining the relay UE The first part of the logo.
The method according to claim 12, wherein the Remote UE determines the first part identifier of the Relay UE by using the first layer 2 identifier that is broadcast by the Relay UE, including:

Determining, by the Remote UE, the first part identifier of the Relay UE in the first layer 2 identifier by using information that is used by the relay UE to indicate the number of bits occupied by the first part identifier in the first layer 2 identifier.
The method according to claim 11, wherein before the remote UE determines the second layer 2 identifier, the method further includes: the Remote UE sending a one-to-one communication request to the Relay UE, so that the relay UE is The Remote UE allocates a second part identifier;

The source layer 2 used by the one-to-one communication request is identified as the third layer 2 identifier, the destination address is the first layer 2 identifier, and the third layer 2 identifier includes the same identifier as the first layer 2 identifier. A portion of the identifier and a second portion identifier, the second portion being identified as a fixed value or assigned by the Remote UE.
The method according to claim 14, wherein the Remote UE sends a one-to-one communication request to the Relay UE, and further includes: the Remote UE placing the non-layer 2 identification information used to identify the Remote UE The one-to-one communication request.
The method according to claim 11, wherein before the Remote UE determines the second layer 2 identifier, the method further includes:

And the remote UE determines, according to the received one-to-one communication setup message from the Relay UE, the second part identifier that is allocated by the Relay UE to the Remote UE.
The method according to any one of claims 11 to 16, wherein before the Remote UE determines the second layer 2 identifier, the method further includes: the Remote UE determining that a Relay UE reselection is required.
A relay terminal relay UE that performs data transmission, wherein the relay UE includes:

a first determining module, configured to determine a first layer 2 identifier;

a first processing module, configured to use the first layer 2 identifier to perform data transmission with a Remote UE identified by using the second layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .
The relay terminal according to claim 18, wherein the first determining module is specifically configured to:

Requesting a specific identifier from the network side, and identifying the layer 2 identifier assigned by the network side as the first layer 2 identifier; or

Requesting, by the network side, a specific identifier, and combining the pre-configured second part identifier with the first part identifier assigned by the network side into the first layer 2 identifier; or

And requesting the specific identifier from the network side, and combining the second part identifier allocated by the Relay UE with the first part identifier allocated by the network side into the first layer 2 identifier.
The relay terminal according to claim 18, wherein the first processing module is further configured to:

Before using the first layer 2 identifier to perform data transmission with the Remote UE identified by the second layer 2, after receiving the one-to-one communication request of the Remote UE, the second UE identifier is allocated to the Remote UE.
The relay terminal according to claim 20, wherein the first processing module is specifically configured to:

Assigning a second part identifier to the remote UE by using a one-to-one communication setup message; where the source layer 2 in the one-to-one communication setup message is identified as the first layer 2 identifier, and the destination layer 2 is identified as the pair The source layer 2 identifier used in a communication request.
The relay terminal according to claim 21, wherein the first processing module is specifically configured to:

If the one-to-one communication request includes information not identified by the layer 2, placing the non-layer 2 identification information included in the one-to-one communication request for identifying the remote UE in the one-to-one communication Create a message.
The relay terminal according to claim 22, wherein the first processing module is further configured to:

If the source layer 2 identifiers in the one-to-one communication request message sent by different remote UEs are the same, the second part identifiers are allocated to the plurality of remote UEs through the one-to-one communication setup message.
The relay terminal according to any one of claims 18 to 23, wherein the first part identifier of the Relay UE is different from the first part identifier of another Relay UE of the same cell and the neighboring cell; or

The first part identifier of the Relay UE is different from the first part identifier of the same base station and other Relay UEs of the neighboring base station; or

The Relay UE is different from the first part identifier of other Relay UEs activated in the network.
The relay terminal according to any one of claims 18 to 23, wherein the first determining module is further configured to:

After determining that the network side trigger layer 2 identifies the reallocation or determines that the layer 2 identity redistribution condition is satisfied, the first layer 2 identifier is determined.
A remote terminal Remote UE that performs data transmission, wherein the Remote UE includes:

a second determining module, configured to determine the second layer 2 identifier;

a second processing module, configured to use the second layer 2 identifier to perform data transmission with a Relay UE identified by using the first layer 2; wherein the first layer 2 identifier and the second layer 2 identifier include the same The second part of the second layer 2 identifier further includes a second part identifier that is allocated by the relay UE, where the first part identifier is a specific identifier of the Relay UE, and the second part identifier is a specific identifier of the Remote UE. .
The remote terminal according to claim 26, wherein the second processing module is further configured to:

Sending a one-to-one communication request to the Relay UE, so that the Relay UE allocates a second part identifier to the Remote UE; wherein the source layer 2 used by the one-to-one communication request is identified as a third layer 2 identifier, and the purpose is The address is the first layer 2 identifier, and the third layer 2 identifier includes a first part identifier and a second part identifier that are the same as the first layer 2 identifier, and the second part identifier is a fixed value or by the Remote UE. distribution.
The remote terminal according to claim 27, wherein the second processing module is further configured to:

The non-layer 2 identification information for identifying the Remote UE is placed in the one-to-one communication request.
The remote terminal according to claim 26, wherein the second processing module is further configured to:

And determining, according to the received one-to-one communication setup message from the Relay UE, the second part identifier allocated by the Relay UE to the Remote UE.
The remote terminal according to any one of claims 26 to 29, wherein the second determining module is further configured to:

After determining that the Relay UE reselection is required, the second layer 2 identifier is determined.