CN110139322A

CN110139322A - A kind of data transmission method and terminal

Info

Publication number: CN110139322A
Application number: CN201810129237.8A
Authority: CN
Inventors: 赵亚利
Original assignee: Telecommunications Science and Technology Research Institute Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-02-08
Filing date: 2018-02-08
Publication date: 2019-08-16

Abstract

The present invention provides a kind of data transmission method and terminal, method includes: to obtain the mapping relations of the Packet Data Convergence Protocol PDCP entity for sending end objectives radio bearer and radio link layer control RLC entity；After receiving media access control MAC layer protocol data cell PDU, according to the mapping relations of PDCP entity and RLC entity, the target PDCP entity that the data that MAC layer PDU is carried are belonged to is determined.Wherein, Target Wireless is carried as sending terminal configuration or has activated the direct communication link carrying of PDCP repeat function.Reception terminal of the invention is by obtaining the PDCP entity of transmission end objectives radio bearer and the mapping relations of RLC entity, it can establish and send the mapping relations of terminal consistent PDCP entity and RLC entity, it is properly received to guarantee that the Target Wireless carrying for sending terminal can be received terminal, ensure that the reliability that data are transmitted under directly logical communication mode.

Description

A kind of data transmission method and terminal

Technical field

The present invention relates to field of communication technology more particularly to a kind of data transmission method and terminals.

Background technique

Compared with previous mobile communication system, following 5G mobile communication system need to adapt to more diversified scene and Business demand.The prevailing scenario of 5G include enhanced mobile broadband (enhanced Mobile Broadband, eMBB) communication, A large amount of machine type communications (massive Machine Type Communications, mMTC), the communication of highly reliable ultralow time delay (Ultra-Reliable and Low Latency Communications, URLLC), these scenes propose height to system Reliably, low time delay, big bandwidth, wide covering etc. require.

Wherein, it for URLLC business since it has relatively high requirement to time delay and reliability, can introduce with packet count (duplication) mechanism is repeated according to convergence protocol (Packet Data Convergence Protocol, PDCP), that is, is passed through The identical PDCP layer protocol data cell (Protocol Data Unit, PDU) of multiple path transmissions, can be passed in this way by multichannel Defeated gain promotes transmission reliability, and reduces propagation delay time.The network architecture of PDCP repeat mechanism is as shown in Figure 1, PDCP layers One radio bearer (a corresponding PDCP entity), passes through in radio link layer control (Radio Link Control, RLC) layer Two logic channels (the corresponding RLC entity of each logic channel) are transmitted respectively, in media access control (Media Access Control, MAC) layer handled by a MAC entity, the data from two RLC logic channels reflected respectively It is mapped on different carrier waves and is transmitted.

In mobile communication system future development, in order to better meet user demand, device-to-device (Device is introduced To Device, D2D) close to service, i.e., terminal direct connection technology, neighbouring terminal can pass through direct-connected chain in short range The mode that road carries out data transmission does not need to be forwarded by central node (i.e. the network equipment), does not need to pass through tradition yet Cellular link carry out UE between information transmission.As shown in Fig. 2, D2D communication refers to: terminal 1 and terminal 2 close to each other, By directly establishing link between two terminals, wherein the link of direct communication is referred to as Sidelink between terminal, in this way It converts local direct communication link by the communication link that the network equipment transmits by script, saves a large amount of bandwidth and net Network efficiency.In addition, two UE close to each other can also obtain the cheap communication clothes of stable high speed using direct point-to-point data link Business.

Wherein, the terminal of direct communication can be in net, or be off-grid, can also be part terminal in net Part terminal off-grid.For the direct communication between terminal, user face protocol stack has data as shown in figure 3, sending terminal and working as Voluntarily determine that PDCP/RLC is established when sending, reception terminal, which is worked as, to be received from resource identification (Source ID), target identification When first rlc layer PDU of (Destination ID) and realm identifier (locale identifier, LCID), if not having Corresponding RLC entity is established, then establishes PDCP/RLC entity for it.If sending terminal starts PDCP repeat mechanism, Terminal side is being sent, for the radio bearer (Radio Bearer, RB) for starting PDCP repeat mechanism, there will be one PDCP entity corresponds to the case where two RLC entities.Sidelink is communicated, if correctly connecing for data will be realized by receiving terminal Receive, then allow for establishing and send the identical PDCP/RLC entity mapping relations of terminal, but receive terminal can not establish and The identical PDCP/RLC entity mapping relations of terminal are sent, therefore in Sidelink communication, number may be cannot achieve by receiving terminal According to be properly received.

Summary of the invention

The present invention provides a kind of data transmission method and terminal, solves the PDCP in terminal direct connection scene in the prior art Under repeat mechanism, terminal is received because of data caused by can not establishing PDCP/RLC entity mapping relations identical with terminal is sent The problem of being unable to properly receive.

The embodiment provides a kind of data transmission method, it is applied to receive terminal, comprising:

It obtains the Packet Data Convergence Protocol PDCP entity for sending end objectives radio bearer and radio link layer controls RLC The mapping relations of entity；Wherein, Target Wireless is carried as sending terminal configuration or has activated the direct communication of PDCP repeat function Link carrying；

After receiving media access control MAC layer protocol data cell PDU, according to reflecting for PDCP entity and RLC entity Relationship is penetrated, determines the target PDCP entity that the data that MAC layer PDU is carried are belonged to.

Wherein, Packet Data Convergence Protocol PDCP entity and the radio link layer control for sending end objectives radio bearer are obtained The step of mapping relations of RLC entity processed, comprising:

It receives and sends the PDU that terminal is sent by Target Wireless carrying；Wherein, PDU includes being used to indicate PDU to be belonged to The identification field of PDCP entity, PDU include rlc layer PDU or MAC layer PDU；

Alternatively,

Receive the mapping relations for sending PDCP entity that terminal is sent, carrying Target Wireless carrying and RLC entity First control signaling；

Alternatively,

Receive the mapping relations of PDCP entity that the network equipment is sent, carrying Target Wireless carrying and RLC entity Second control signaling.

Wherein, PDU sends terminal and sends after PDCP repeat function configures or activates, and the first control signaling is to send What terminal was sent before PDCP repeat function configures or activates, the second control signaling is that the network equipment is configured in PDCP repeat function Or sent before activation.

Wherein, identification field is located in PDU head, PDU subheader or the data field of PDU, and identification field carries PDU and returned Belong to the number information of PDCP entity.

Wherein, the first control signaling or the second control signaling include: broadcast, radio resource control RRC signaling, MAC signaling Or physical layer signaling.

Wherein, the first control signaling or the second control signaling carry: Target indication information, and Target indication information is for referring to The mapping relations for showing the logical channel number LCID of RLC entity and the number information of PDCP entity, correspond to alternatively, being used to indicate The LCID of at least two RLC entities of same PDCP entity.

Wherein, according to the mapping relations of PDCP entity and RLC entity, the mesh that the data that MAC layer PDU is carried are belonged to is determined After the step of marking PDCP entity, comprising:

Whether detection target PDCP has been established；

If having been established, the radio bearer between target PDCP entity and RLC entity is established；

If not setting up, the radio bearer between target PDCP entity and target PDCP entity and RLC entity is established.

The embodiments of the present invention also provide a kind of terminal, it is applied to receive terminal, comprising: transceiver, memory, processing Device and storage on a memory and the computer program that can run on a processor, when processor executes computer program realization with Lower step:

Wherein, it is performed the steps of when processor executes computer program

Alternatively,

Wherein, it is performed the steps of when processor executes computer program

Whether detection target PDCP has been established；

The embodiments of the present invention also provide a kind of terminal, it is applied to receive terminal, comprising:

Obtain module, for obtains send end objectives radio bearer Packet Data Convergence Protocol PDCP entity with wirelessly The mapping relations of link layer control RLC entity；Wherein, Target Wireless is carried as sending terminal configuration or having activated PDCP repeating function The direct communication link carrying of energy；

Determining module, for after receiving media access control MAC layer protocol data cell PDU, according to PDCP entity With the mapping relations of RLC entity, the target PDCP entity that the data that MAC layer PDU is carried are belonged to is determined.

The embodiments of the present invention also provide a kind of computer readable storage mediums, are stored thereon with computer program, should The step of above-mentioned data transmission method is realized when computer program is executed by processor.

The embodiments of the present invention also provide a kind of data transmission method, it is applied to send terminal, comprising:

To the Packet Data Convergence Protocol PDCP entity for receiving terminal or network equipment transmission Target Wireless carrying and wirelessly The mapping relations of link layer control RLC entity；Wherein, Target Wireless is carried as configuring or having activated the direct of PDCP repeat function Communication link carrying.

Wherein, to receive terminal or the network equipment send Packet Data Convergence Protocol PDCP entity that Target Wireless carries with Radio link layer controls the step of mapping relations of RLC entity, comprising:

It is carried by Target Wireless to reception terminal and sends PDU；Wherein, PDU includes being used to indicate the belonged to PDCP reality of PDU The identification field of body, PDU include rlc layer PDU or MAC layer PDU；

Alternatively,

The first control for carrying the PDCP entity of Target Wireless carrying with the mapping relations of RLC entity is sent to terminal is received Signaling processed；

Alternatively,

The auxiliary that the mapping relations for carrying PDCP entity and RLC entity that Target Wireless carries are sent to the network equipment is believed Breath.

Wherein, PDU sends terminal and sends after PDCP repeat function configures or activates, and the first control signaling is to send What terminal was sent before PDCP repeat function configures or activates, auxiliary information is to send terminal to configure or swash in PDCP repeat function It is sent before living.

Wherein, the mapping relations for carrying PDCP entity and RLC entity that Target Wireless carries are sent to reception terminal First control signaling, alternatively, sending the mapping pass for carrying PDCP entity and RLC entity that Target Wireless carries to the network equipment After the step of auxiliary information of system, further includes:

PDCP repeat function is activated, and sends media access control MAC layer protocol data cell PDU to terminal is received.

Wherein, the mapping relations for carrying PDCP entity and RLC entity that Target Wireless carries are sent to the network equipment After the step of auxiliary information, further includes:

Receive the first confirmation message that the network equipment is sent；Wherein, the first confirmation message is that the network equipment is receiving It is sent after second confirmation message of receipts terminal feedback, the second confirmation message is to receive terminal to receive what the network equipment was sent It is sent after second control signaling, the second control signaling is what the network equipment was sent after receiving auxiliary information.

To the Packet Data Convergence Protocol PDCP entity for receiving terminal or network equipment transmission Target Wireless carrying and wirelessly The mapping relations of link layer control RLC entity；Wherein, Target Wireless is carried as sending terminal configuration or having activated PDCP repeating function The direct communication link carrying of energy.

Wherein, it is performed the steps of when processor executes computer program

Alternatively,

Wherein, it is performed the steps of when processor executes computer program

The embodiments of the present invention also provide a kind of terminal, it is applied to send terminal, comprising:

Sending module, for sending the Packet Data Convergence Protocol that Target Wireless carries to reception terminal or the network equipment The mapping relations of PDCP entity and radio link layer control RLC entity；Wherein, Target Wireless is carried as configuring or having activated PDCP The direct communication link of repeat function carries.

The beneficial effect of above-mentioned technical proposal of the invention is: receiving terminal by obtaining and sends end objectives radio bearer PDCP entity and RLC entity mapping relations, can establish and send the mapping of terminal consistent PDCP entity and RLC entity Relationship, to guarantee that end can be received in the direct communication link carrying for configuring or having activated PDCP repeat function by sending terminal End is properly received, and ensure that the reliability that data are transmitted under directly logical communication mode.

Detailed description of the invention

Fig. 1 shows the network architecture schematic diagrams of PDCP repeat mechanism；

Fig. 2 indicates the network architecture schematic diagram of D2D communication；

Fig. 3 indicates the configuration diagram of the user face protocol stack of D2D communication；

Fig. 4 indicates the flow diagram that the data transmission method of terminal side is received in the embodiment of the present invention；

Fig. 5 indicates the flow diagram of the data transmission method of scene one of the present invention；

Fig. 6 indicates the structural schematic diagram one of scene of the present invention once PDU；

Fig. 7 indicates the structural schematic diagram two of scene of the present invention once PDU；

Fig. 8 shows the flow diagrams of the data transmission method of scene two of the present invention:

Fig. 9 indicates the flow diagram of the data transmission method of scene three of the present invention；

Figure 10 indicates the modular structure schematic diagram that terminal is received in the embodiment of the present invention；

Figure 11 indicates the flow diagram that the data transmission method of terminal is sent in the embodiment of the present invention；

Figure 12 indicates the modular structure schematic diagram that terminal is sent in the embodiment of the present invention；

Figure 13 indicates the structural block diagram of the terminal of the embodiment of the present invention.

Specific embodiment

To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.In the following description, such as specific configuration is provided and the specific detail of component is only In order to help comprehensive understanding the embodiment of the present invention.It therefore, it will be apparent to those skilled in the art that can be to reality described herein Example is applied to make various changes and modifications without departing from scope and spirit of the present invention.In addition, for clarity and brevity, it is omitted pair The description of known function and construction.

It should be understood that " one embodiment " or " embodiment " that specification is mentioned in the whole text mean it is related with embodiment A particular feature, structure, or characteristic is included at least one embodiment of the present invention.Therefore, occur everywhere in the whole instruction " in one embodiment " or " in one embodiment " not necessarily refer to identical embodiment.In addition, these specific features, knot Structure or characteristic can combine in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be appreciated that the size of the serial number of following each processes is not meant to execute suitable Sequence it is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention Process constitutes any restriction.

In addition, the terms " system " and " network " are often used interchangeably herein.

In embodiment provided herein, it should be appreciated that " B corresponding with A " indicates that B is associated with A, can be with according to A Determine B.It is also to be understood that determine that B is not meant to determine B only according to A according to A, it can also be according to A and/or other information Determine B.

In the embodiment of the present invention, the form of the network equipment is unlimited, can be including macro base station (Macro Base Station), micro-base station (Pico Base Station), Node B (address of the mobile base station 3G), enhanced base station (eNB), Family's enhanced base station (Femto eNB or Home eNode B or Home eNB or HeNB), relay station, access point, RRU The access net of (Remote Radio Unit, far-end RF module), RRH (Remote Radio Head, remote radio head) etc.. User terminal can be mobile phone (or mobile phone) or other equipment that can send or receive wireless signal, including user It is equipment, personal digital assistant (PDA), radio modem, wireless communication device, hand-held device, laptop computer, wireless Phone, wireless local loop (WLL) stand, movable signal can be converted to CPE (the Customer Premise of WiFi signal Equipment, client terminal) or intelligent movable hot spot, intelligent appliance or other obstructed remarkable operations can it is spontaneous with it is mobile The equipment etc. of communication.

Specifically, the embodiment provides a kind of data transmission method, it is applied to receive terminal, it is existing to solve Under PDCP repeat mechanism in technology in terminal direct connection scene, terminal is received because PDCP/ identical with terminal is sent can not be established The problem of data are unable to properly receive caused by RLC entity mapping relations.

As shown in figure 4, the embodiment provides a kind of data transmission method, applied to reception terminal, including with Lower step:

Step 41: obtaining the Packet Data Convergence Protocol PDCP entity and radio link layer for sending end objectives radio bearer Control the mapping relations of RLC entity.

Wherein, Target Wireless is carried as sending terminal configuration or having activated the direct communication link of PDCP repeat function holding It carries.It is worth noting that this method is mainly for direct communication between terminals scene, once direct communication scene issues end needle of making arrangements for his funeral PDCP copy function to be executed to some direct communication radio bearer, then needing carrying PDCP entity and RLC entity Mapping relations are notified to the reception terminal of direct communication.

Step 42: real according to PDCP entity and RLC after receiving media access control MAC layer protocol data cell PDU The mapping relations of body determine the target PDCP entity that the data that MAC layer PDU is carried are belonged to.

In this way, according to the mapping relations of PDCP entity and RLC entity, it is ensured that receiving terminal correctly can establish and send The mapping relations of terminal consistent PDCP entity and RLC entity, to guarantee that sending terminal is configuring or having activated PDCP The direct communication link carrying of duplication can be correctly received, and ensure that data transmission under directly logical communication mode Reliability.

Wherein, step 41 can be realized through but not limited to following manner:

Mode one receives the PDU that transmission terminal passes through Target Wireless carrying transmission.Wherein, PDU includes being used to indicate PDU The identification field of belonged to PDCP entity, PDU include rlc layer PDU or MAC layer PDU.It is used that is, being carried in data PDU In the identification field for the PDCP entity for identifying the attribution data.Wherein, identification field is located at PDU head, PDU subheader or the number of PDU According in field, identification field carries the number information of the belonged to PDCP entity of PDU.That is, data PDU it is corresponding PDU or Person's subheader or data PDU itself carry identification information, and for identifying the PDCP entity of the attribution data, identification information be can be PDCP entity number, PDCP entity number mode depend on the realization that direct communication sends terminal.

In one embodiment, PDU sends terminal and sends after PDCP repeat function configures or activates, that is, sends eventually End PDCP duplication configure or activate after, will configuration or activation PDCP duplication carrying PDCP entity and The mapping relations of RLC entity are sent to reception terminal.

Mode two receives the mapping for sending PDCP entity and RLC entity that terminal is sent, carrying Target Wireless carrying First control signaling of relationship.Which be introduce direct communication interface control signaling (such as: RRC signaling, MAC signaling or Physical layer signaling) mapping relations of the corresponding PDCP entity of which RLC entity are notified to the reception terminal of direct communication.

In an advantageous embodiment, the first control signaling is to send terminal hair before PDCP repeat function configures or activates Send, i.e., transmission terminal determine configuration or activation PDCP duplication after, and PDCP duplication configuration or Before activation, the mapping relations of the carrying PDCP entity for configuring or activating PDCP duplication and RLC entity are sent to and are connect Receive terminal.

Mode three, the mapping for receiving PDCP entity and RLC entity that the network equipment is sent, carrying Target Wireless carrying Second control signaling of relationship.In which, the network equipment obtains the Target Wireless carrying of the transmission terminal of direct communication The mapping relations of PDCP entity and RLC entity, wherein Target Wireless is carried as sending terminal configuration or has activated PDCP The direct communication link of duplication carries (Sidelink Radio Bearer, SLRB).The network equipment is getting hair After end make arrangements for his funeral for the PDCP entity of Target Wireless carrying and the mapping relations of RLC entity, by the mapping relations by newly introducing Control signaling notify to the reception terminal of direct communication.That is, if which SLRB configuration is terminal voluntarily determine for Or activation PDCP duplication, then terminal needs the mapping relations by PDCP entity and RLC entity to notify to set to network Standby, specific advice method can also use special control signaling, and (such as: broadcast, RRC signaling, MAC signaling or physical layer are believed Enable etc.).

In an advantageous embodiment, the second control signaling is network equipment hair before PDCP repeat function configures or activates Send, i.e., transmission terminal determine configuration or activation PDCP duplication after, and PDCP duplication configuration or Before activation, the mapping relations of the carrying PDCP entity for configuring or activating PDCP duplication and RLC entity are sent to net Network equipment, so that the network equipment is notified to the reception terminal of direct communication.

Wherein, the first control signaling or the second control signaling include: broadcast, wireless heterogeneous networks (Radio Resource Control, RRC) signaling, MAC signaling or physical layer signaling.First control signaling or the second control signaling carry: target refers to Show information, Target indication information be used to indicate RLC entity logical channel number (Logical Channel Identify, LCID) with the mapping relations of the number information of PDCP entity, alternatively, being used to indicate at least two corresponding to same PDCP entity The LCID of RLC entity.That is, the first control signaling or the second control signaling indicate the corresponding PDCP of which RLC entity It can there are several types of modes when entity:

Alt1: directly the mapping relations of carrying RLC entity LCID and PDCP number, PDCP entity number mode depend on straight It connects letter and sends terminal realization.

Alt2: LCID points for will be mapped to the RLC entity of identical PDCP entity are one group, and grouping letter is carried in control signaling Breath.

After step 42, this method can also include: whether detection target PDCP has been established；If having been established, establish Radio bearer between target PDCP entity and RLC entity；If not setting up, target PDCP entity and target PDCP are established Radio bearer between entity and RLC entity.That is, the reception terminal of direct communication is after receiving MAC layer PDU, root According to the mapping relations between PDCP entity and RLC entity, the target PDCP entity that the data that MAC layer PDU is carried are belonged to is determined, Further according to the identification information of target PDCP determine corresponding PDCP entity whether it has been established that if it has been established that if it is straight It connects and establishes radio bearer between PDCP entity and RLC entity, if not setting up, establish corresponding PDCP entity and PDCP is real Radio bearer between body and RLC entity.

The data transmission method for receiving terminal side is described briefly above, below in conjunction with attached drawing and concrete application scene pair It is described further:

Scene one,

The scene corresponds to mode one, and it is one that wherein direct communication, which sends terminal, and direct communication receives terminal and can be One or more.

As shown in figure 5, the data transmission method includes:

Step 51: the transmission terminal of direct communication determines whether some direct communication radio bearer SLRB activates PDCP to repeat Function (duplication).

Whether SLRB configures or activates PDCP duplication can send terminal oneself judgement by direct communication, for It can also be adjudicated by the network equipment in net.If the network equipment is adjudicated, whether network equipment needs will configure or swash The court verdict of PDCP duplication living is notified to the transmission terminal of direct communication.

Step 52: the reception terminal for sending terminal to direct communication of direct communication sends direct communication (sidelink) MAC layer PDU.

When the transmission terminal of direct communication is configured for some SLRB or has activated PDCP duplication, then the SLRB One PDCP entity corresponds to multiple (at least two) RLC entities.When the SLRB has data to send, PDCP layers to being sent Data carry out duplication, are then sent respectively by multiple RLC entities corresponding with the PDCP entity.In order to allow directly The reception terminal of communication correctly can establish and send the mapping relations of terminal identical PDCP entity and RLC entity, need Data PDU is PDU corresponding, PDU subheader or data PDU itself carry identification information, for identifying the PDCP of the attribution data Entity.

Specifically, data PDU can refer to the PDU or MAC layer PDU of rlc layer.PDU refer to the RLC of rlc layer The head of PDU or the subheader of MAC layer MAC PDU.The PDCP entity of ownership specifically can be the number of PDCP entity, PDCP entity Numbering is realized depending on terminal.

In one embodiment, the mapping relations of PDCP entity and RLC entity are straight in RLC PDU or data PDU Carrying is connect, and direct communication uses UM mode in rlc layer.NR UMD PDU format is as shown in fig. 6, comprising complete in UMD PDU RLC service data unit (Service Data Unit, SDU), if carrying PDCP in RLC PDU of RLC UMD PDU Entity number, it is assumed that the corresponding PDCP entity number of SLRB for configuring or having activated PDCP duplication is 1, uses 3bit Mark；It, can also if carrying identification information in the corresponding RLC UMD PDU subheader of RLC UMD PDU or UMD PDU itself PDCP entity number is indicated using 3 R bits (bit).Or as shown in fig. 7, in UMD PDU include RLC SDU segmentation, If carrying PDCP entity number in RLC PDU of RLC UMD PDU, it is assumed that configure or have activated PDCP duplication The corresponding PDCP entity number of SLRB be 1, identified using 3bit；If in the corresponding RLC UMD PDU subheader of RLC UMD PDU Or UMD PDU itself carries identification information, then additional 1 byte (byte) can be introduced in UMDPDU, and using wherein 3bit indicate PDCP entity number.It preferably, can be with if carrying PDCP entity number in the UMD PDU data part RLC The preceding 3bit of the part Fig. 6 and Fig. 7 Data is defined for indicating PDCP entity number.

Step 53: the reception terminal of direct communication determines the need for building according to the sidelink MAC layer PDU received Radio bearer between vertical PDCP entity and PDCP entity and RLC entity.

Terminal is received for direct communication, is received when receiving terminal comprising Source ID, Destination ID and LCID MAC PDU after, judge the Source ID, Destination ID and LCID correspondence whether have corresponding RLC entity, if It does not need then to establish corresponding RLC entity.

Then according to the PDCP entity identifier carried in data PDU corresponding PDU or subheader or data PDU itself Information, determine corresponding PDCP entity whether it has been established that if it has been established that if directly establish reflecting for PDCP and RLC entity Relationship is penetrated, corresponding PDCP entity is otherwise established.

Scene two,

The scene corresponds to mode two, as shown in figure 8, the data transmission method includes:

Step 81: the transmission terminal of direct communication determines whether some direct communication radio bearer SLRB configures or activate PDCP duplication。

Step 82: the terminal that sends terminal to receive of direct communication sends control signaling.

The control signaling (such as broadcast, RRC signaling, MAC signaling or physical layer signaling) for introducing direct communication interface will The mapping relations of the corresponding PDCP entity of which RLC entity are notified to the reception terminal of direct communication.The transmission of direct communication The control signaling is sent to the reception terminal of direct communication by direct communication link (Sidelink) by terminal.

It wherein, can there are several types of modes when control signaling indicates which RLC entity corresponding PDCP entity:

Alt1: directly the mapping relations of carrying RLC entity LCID and PDCP number, PDCP entity number mode depend on straight The transmission terminal for connecting letter is realized.

Step 83: the transmission terminal of direct communication activates PDCP duplication.

Step 84: the transmission terminal of direct communication sends sidelink MAC PDU.

When the transmission terminal of direct communication is configured for some SLRB or has activated PDCP duplication, then the SLRB One PDCP entity corresponds to multiple (at least two) RLC entities.When the SLRB has data to send, PDCP layers to being sent Data carry out duplication, are then sent respectively by multiple RLC entities corresponding with the PDCP entity.

Step 85: the reception terminal of direct communication is received according to the sidelink MAC PDU and step 82 that receive Control signaling, it is determined whether need to establish the mapping relations of PDCP entity and PDCP entity and RLC entity.

For the reception terminal of direct communication, when receive terminal receive comprising Source ID, Destination ID and After the MAC PDU of LCID, judge whether the Source ID, Destination ID and LCID correspondence have corresponding RLC entity, Need to establish corresponding RLC entity if not.Then according to carried in the control signaling received in step 82 which The mapping relations of RLC entity and same PDCP entity, determine whether the RLC entity has the corresponding PDCP entity having built up. If there is corresponding PDCP entity, then the radio bearer between PDCP entity and RLC entity is directly established, otherwise established corresponding PDCP entity, and establish after establishing PDCP entity the radio bearer between PDCP entity and RLC entity.

Scene three,

Corresponding to mode three, as shown in figure 9, the data transmission method includes:

Step 91: the transmission terminal of direct communication determines whether some direct communication radio bearer SLRB activates PDCP duplication。

Step 92: the network equipment that sends terminal to of direct communication sends auxiliary information.

Wherein, which is optional step.When SLRB needs to configure or activate PDCP duplication, if configuration or sharp RLC physical network equipment used in PDCP duplication after work is not known, then needs the step to be notified, otherwise The step can be omitted.Wherein, which RLC entity is the content of the auxiliary information be used to indicate and correspond to the same PDCP entity.

Step 93: the network equipment sends control signaling to the reception terminal of direct communication.

Wherein, which notifies the mapping relations of the corresponding PDCP entity of which RLC entity to direct communication Reception terminal.Wherein, the mode of control signaling is as described in scene two, therefore details are not described herein.

Step 94: the reception terminal of direct communication sends confirmation message to the network equipment, and the network equipment is to direct communication It sends terminal and sends confirmation message.

The step is optional step, needs to configure or activates for confirming whether the reception terminal of direct communication receives The PDCP entity of the SLRB of PDCP duplication and the mapping relations of RLC entity.It is directly logical if the step does not occur The transmission terminal of letter after T time-out, can directly activate PDCP based on a timer T is started after step 92 duplication。

Step 95: the transmission terminal of direct communication activates PDCP duplication.

Step 96: the transmission terminal of direct communication sends sidelink MAC PDU.

Step 97: the reception terminal of direct communication is received according to the sidelink MAC PDU and step 93 that receive Control signaling determine the need for establishing the mapping relations of PDCP entity and PDCP entity and RLC entity.

Terminal is received for direct communication, is received when receiving terminal comprising Source ID, Destination ID and LCID MAC PDU after, judge the Source ID, Destination ID and LCID correspondence whether have corresponding RLC entity, if It does not need then to establish corresponding RLC entity.Then which the RLC entity carried in the control signaling received in root step 93 With the mapping relations of same PDCP, determine whether the RLC entity has the corresponding PDCP entity having built up.If there is corresponding PDCP entity then directly establishes the radio bearer between PDCP entity and RLC entity, otherwise establishes corresponding PDCP entity, and The radio bearer between PDCP entity and RLC entity is established after establishing PDCP entity.

In the data transmission method of the embodiment of the present invention, terminal is received by obtaining and sends end objectives radio bearer The mapping relations of PDCP entity and RLC entity, the mapping that can establish and send the consistent PDCP entity of terminal and RLC entity are closed System, to guarantee that terminal can be received in the direct communication link carrying for configuring or having activated PDCP repeat function by sending terminal It is properly received, ensure that the reliability that data are transmitted under directly logical communication mode.

Above embodiments respectively just data transmission method of the invention make introduction, below the present embodiment will be in conjunction with attached drawing pair Its corresponding terminal is described further.

Specifically, as shown in Figure 10, the terminal of the embodiment of the present invention is applied to receive terminal 1000, comprising:

Obtain module 1010, for obtains send end objectives radio bearer Packet Data Convergence Protocol PDCP entity and The mapping relations of radio link layer control RLC entity；Wherein, Target Wireless is carried as sending terminal configuration or has activated PDCP weight The direct communication link carrying of multiple function；

Determining module 1020, for after receiving media access control MAC layer protocol data cell PDU, according to PDCP The mapping relations of entity and RLC entity determine the target PDCP entity that the data that MAC layer PDU is carried are belonged to.

Wherein, obtaining module 1010 includes:

First receiving submodule, for receiving the PDU for sending terminal and sending by Target Wireless carrying；Wherein, PDU includes It is used to indicate the identification field of the belonged to PDCP entity of PDU, PDU includes rlc layer PDU or MAC layer PDU；

Alternatively,

Second receiving submodule, for receive send terminal send, carry Target Wireless carrying PDCP entity with First control signaling of the mapping relations of RLC entity；

Alternatively,

Third receiving submodule, for receive the network equipment transmission, carry Target Wireless carrying PDCP entity with Second control signaling of the mapping relations of RLC entity.

Wherein, the terminal 1000 further include:

Detection module, for detecting whether target PDCP has been established；

First creation module, if establishing the radio bearer between target PDCP entity and RLC entity for having been established；

Second creation module, if establishing target PDCP entity and target PDCP entity for not setting up and RLC being real Radio bearer between body.

Terminal embodiment of the invention is, all realities in above method embodiment corresponding with the embodiment of the above method Existing means can also reach identical technical effect suitable for the embodiment of the terminal.The reception terminal is sent by obtaining It is real can to establish and send the consistent PDCP of terminal for the PDCP entity of end objectives radio bearer and the mapping relations of RLC entity The mapping relations of body and RLC entity, to guarantee to send terminal in the direct communication chain for configuring or having activated PDCP repeat function Road carrying can be received terminal and be properly received, and ensure that the reliability that data are transmitted under directly logical communication mode.

The data transmission method and terminal for describing the embodiment of the present invention from reception terminal side above, below in conjunction with attached drawing The data transmission method for sending terminal side is described further.

As shown in figure 11, the embodiment of the invention provides a kind of data transmission method, it is applied to send terminal, including following Step:

Step 111: real to the Packet Data Convergence Protocol PDCP for receiving terminal or network equipment transmission Target Wireless carrying The mapping relations of body and radio link layer control RLC entity.

Wherein, Target Wireless is carried as configuring or having activated the direct communication link carrying of PDCP repeat function.It is directly logical Letter scene issues end of making arrangements for his funeral once to execute PDCP copy function for some direct communication radio bearer, needs to hold this The mapping relations for carrying PDCP entity and RLC entity are notified to the reception terminal of direct communication.

In some embodiments, step 111 can be realized through but not limited to following manner:

Mode one is carried by Target Wireless to reception terminal transmission PDU.Wherein, PDU includes being used to indicate PDU to be returned Belong to the identification field of PDCP entity, PDU includes rlc layer PDU or MAC layer PDU.That is, carrying in data PDU for marking Know the identification field of the PDCP entity of the attribution data.Wherein, identification field is located at PDU head, PDU subheader or the data word of PDU Duan Zhong, identification field carry the number information of the belonged to PDCP entity of PDU, wherein PDCP entity number mode depends on straight Connect the realization that letter sends terminal.

Preferably, PDU sends terminal and sends after PDCP repeat function configures or activates, i.e. transmission terminal is in PDCP After duplication configuration or activation, by the carrying PDCP entity and RLC entity of configuration or activation PDCP duplication Mapping relations are sent to reception terminal.

Alternatively,

Mode two sends the mapping relations for carrying PDCP entity and RLC entity that Target Wireless carries to reception terminal The first control signaling.

Preferably, the first control signaling is to send terminal to send before PDCP repeat function configures or activates, that is, is sent Terminal will match after determining configuration or activation PDCP duplication, and before PDCP duplication is configured or is activated The mapping relations of the carrying PDCP entity and RLC entity of setting or activate PDCP duplication are sent to reception terminal.

Alternatively,

Mode three sends the mapping relations for carrying PDCP entity and RLC entity that Target Wireless carries to the network equipment Auxiliary information.That is, if terminal is voluntarily determined for which SLRB configuration or activation PDCP duplication, that Terminal needs the mapping relations by PDCP entity and RLC entity to notify that the network equipment, specific advice method can also make With special control signaling (such as: broadcast, RRC signaling, MAC signaling or physical layer signaling).

In an advantageous embodiment, the second control signaling is network equipment hair before PDCP repeat function configures or activates Send, i.e., transmission terminal determine configuration or activation PDCP duplication after, and PDCP duplication configuration or Before activation, the mapping relations of the carrying PDCP entity for configuring or activating PDCP duplication and RLC entity are sent to net Network equipment

Wherein, the first control signaling or the second control signaling include: broadcast, radio resource control RRC signaling, MAC signaling Or physical layer signaling.Wherein, the first control signaling or the second control signaling carry: Target indication information, Target indication information The mapping relations of the logical channel number LCID of RLC entity and the number information of PDCP entity are used to indicate, alternatively, being used to indicate The LCID of at least two RLC entities corresponding to same PDCP entity.

It specifically, can when the first control signaling or the second control signaling indicate which RLC entity corresponding PDCP entity There are several types of in a manner of:

Alt2: LCID points for will be mapped to the RLC entity of identical PDCP entity are one group, and grouping letter is carried in control signaling Breath.In a preferred embodiment, it is closed to the mapping for receiving PDCP entity and RLC entity that terminal transmission carries Target Wireless carrying First control signaling of system carries the PDCP entity of Target Wireless carrying and reflecting for RLC entity alternatively, sending to the network equipment After the step of penetrating the auxiliary information of relationship, further includes: activation PDCP repeat function, and media access control is sent to terminal is received Mac-layer protocol data cell PDU processed.Wherein, the transmission terminal which corresponds to direct communication in scene two and scene three swashs The step of transmission terminal of PDCP duplication living and direct communication sends sidelink MAC PDU, thus it is no longer superfluous herein It states.

Wherein, when employing mode three, after step 111 further include: receive the first confirmation message that the network equipment is sent. Wherein, the first confirmation message is what the network equipment was sent after receiving the second confirmation message for receiving terminal feedback, and second really Recognizing information is to receive terminal to send after the second control signaling for receiving network equipment transmission, and the second control signaling is network What equipment was sent after receiving auxiliary information.Wherein, which corresponds to above-mentioned scene three, and therefore, not repeat them here.

In the data transmission method of the embodiment of the present invention, sends terminal to receive terminal or the network equipment sends Target Wireless The PDCP entity of carrying and the mapping relations of RLC entity, so that receiving terminal determines the PDCP for sending end objectives radio bearer The mapping relations of terminal consistent PDCP entity and RLC entity can be established and be sent to the mapping relations of entity and RLC entity, Terminal can be received just to guarantee to send terminal in the direct communication link carrying for configuring or having activated PDCP repeat function It really receives, ensure that the reliability that data are transmitted under directly logical communication mode.

Specifically, as shown in figure 12, the terminal 1200 of the embodiment of the present invention is applied to send terminal, comprising:

Sending module 1210, for being assisted to the packet data convergence for receiving terminal or network equipment transmission Target Wireless carrying Discuss the mapping relations of PDCP entity and radio link layer control RLC entity；Wherein, Target Wireless is carried as configuring or have activated The direct communication link of PDCP repeat function carries.

Wherein, sending module 1210 includes:

First sending submodule sends PDU for carrying by Target Wireless to reception terminal；Wherein, PDU includes being used for Indicate the identification field of the belonged to PDCP entity of PDU, PDU includes rlc layer PDU or MAC layer PDU；

Alternatively,

Second sending submodule carries the PDCP entity and RLC reality that Target Wireless carries for sending to reception terminal First control signaling of the mapping relations of body；

Alternatively,

Third sending submodule carries the PDCP entity and RLC reality that Target Wireless carries for sending to the network equipment The auxiliary information of the mapping relations of body.

Wherein, terminal 1200 further include:

Active module sends media access control MAC layer protocol number for activating PDCP repeat function, and to terminal is received According to unit PDU.

Wherein, terminal 1200 further include:

Receiving module, for receiving the first confirmation message of network equipment transmission；Wherein, the first confirmation message sets for network For what is sent after receiving the second confirmation message for receiving terminal feedback, the second confirmation message is to receive terminal to receive net It is sent after the second control signaling that network equipment is sent, the second control signaling is that the network equipment is sent after receiving auxiliary information 's.

Terminal embodiment of the invention is, all realities in above method embodiment corresponding with the embodiment of the above method Existing means can also reach identical technical effect suitable for the embodiment of the terminal.This send terminal to receive terminal or The network equipment sends the PDCP entity of Target Wireless carrying and the mapping relations of RLC entity, sends eventually so that receiving terminal and determining The PDCP entity of Target Wireless carrying and the mapping relations of RLC entity are held, the consistent PDCP entity of terminal can be established and send With the mapping relations of RLC entity, thus guarantee send terminal in the direct communication link for configuring or having activated PDCP repeat function Carrying can be received terminal and be properly received, and ensure that the reliability that data are transmitted under directly logical communication mode.

As shown in figure 13, the present embodiment provides a kind of terminals, comprising: transceiver 134, memory 133, processor 131 and Store the computer program that can be run on a memory and on a processor, wherein

Processor 131；And the memory 133 being connected by bus interface 132 with the processor 131, it is described to deposit Reservoir 133 is for storing the processor 131 used program and data when executing operation, when processor 131 calls simultaneously When executing the program and data stored in the memory 133, following process is executed.

Wherein, transceiver 134 is connect with bus interface 132, for sending and receiving number under the control of processor 131 According to.

When the terminal is as terminal is received, processor 131 performs the steps of when executing computer program

Wherein, it is performed the steps of when processor 131 executes computer program

Alternatively,

Whether detection target PDCP has been established；

When terminal be receive terminal when, receive terminal by obtain send end objectives radio bearer PDCP entity with The mapping relations of terminal consistent PDCP entity and RLC entity can be established and be sent to the mapping relations of RLC entity, to protect Card transmission terminal can be received terminal in the direct communication link carrying for configuring or having activated PDCP repeat function and be properly received, It ensure that the reliability that data are transmitted under directly logical communication mode.

When terminal is as terminal is sent, processor 131 performs the steps of when executing computer program

Alternatively,

When terminal is to send terminal, sends terminal to receive terminal or the network equipment sends the PDCP of Target Wireless carrying The mapping relations of entity and RLC entity, so that receiving terminal determines that the PDCP entity for sending end objectives radio bearer and RLC are real The mapping relations of body, can establish and send the mapping relations of terminal consistent PDCP entity and RLC entity, to guarantee to send Terminal can be received terminal in the direct communication link carrying for configuring or having activated PDCP repeat function and be properly received, and ensure that The reliability that data are transmitted under directly logical communication mode.

It should be noted that bus architecture may include the bus and bridge of any number of interconnection in Figure 13, specifically by The various circuits for the memory that the one or more processors and memory 133 that processor 131 represents represent link together.Always Various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like can also be linked at one by line architecture It rises, these are all it is known in the art, and therefore, it will not be further described herein.Bus interface provides interface.It receives Hair machine 134 can be multiple element, that is, include transmitter and transceiver, provide for over a transmission medium with various other devices The unit of communication.For different terminals, user interface 135, which can also be, external can be inscribed the interface for needing equipment, connection Equipment include but is not limited to keypad, display, loudspeaker, microphone, control stick etc..Processor 131 is responsible for management bus Framework and common processing, memory 133 can store the used data when executing operation of processor 131.

It will be understood by those skilled in the art that realize above-described embodiment all or part of step can by hardware come It completes, relevant hardware can also be indicated by computer program to complete, the computer program includes executing above-mentioned side The instruction of some or all of step of method；And the computer program can store in a readable storage medium storing program for executing, storage medium It may be any type of storage medium.

The embodiment of the present invention also provides a kind of computer readable storage medium, and meter is stored on computer readable storage medium Calculation machine program, the computer program realize each process of above-mentioned data transmission method embodiment, and energy when being executed by processor Reach identical technical effect, to avoid repeating, which is not described herein again.Wherein, the computer readable storage medium, such as only Read memory (Read-Only Memory, abbreviation ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic or disk etc..

In addition it should be pointed out that in the apparatus and method of the present invention, it is clear that each component or each step are can to divide It solves and/or reconfigures.These, which decompose and/or reconfigure, should be regarded as equivalent scheme of the invention.Also, execute above-mentioned system The step of column processing, can execute according to the sequence of explanation in chronological order naturally, but not need centainly suitable according to the time Sequence executes, and certain steps can execute parallel or independently of one another.For those of ordinary skill in the art, it is to be understood that this The whole or any steps or component of the method and apparatus of invention, can any computing device (including processor, storage Medium etc.) perhaps to be realized with hardware, firmware, software or their combination in the network of computing device, this is this field Basic programming skill of the those of ordinary skill in the case where having read explanation of the invention with them can be achieved with.

Therefore, the purpose of the present invention can also by run on any computing device a program or batch processing come It realizes.The computing device can be well known fexible unit.Therefore, the purpose of the present invention can also include only by offer The program product of the program code of the method or device is realized to realize.That is, such program product is also constituted The present invention, and the storage medium for being stored with such program product also constitutes the present invention.Obviously, the storage medium can be Any well known storage medium or any storage medium that developed in the future.It may also be noted that of the invention In device and method, it is clear that each component or each step can be decomposed and/or be reconfigured.These decomposition and/or again group Conjunction should be regarded as equivalent scheme of the invention.Also, the step of executing above-mentioned series of processes can be naturally according to the sequence of explanation It executes in chronological order, but does not need centainly to execute sequentially in time.Certain steps can parallel or independently of one another It executes.

The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims

1. a kind of data transmission method is applied to receive terminal characterized by comprising

It obtains the Packet Data Convergence Protocol PDCP entity for sending end objectives radio bearer and radio link layer controls RLC entity Mapping relations；Wherein, the Target Wireless is carried as the transmission terminal configuration or has activated the direct of PDCP repeat function Communication link carrying；

After receiving media access control MAC layer protocol data cell PDU, closed according to the mapping of PDCP entity and RLC entity System determines the target PDCP entity that the data that the MAC layer PDU is carried are belonged to.

2. data transmission method according to claim 1, which is characterized in that the acquisition sends end objectives radio bearer Packet Data Convergence Protocol PDCP entity and radio link layer control RLC entity mapping relations the step of, comprising:

Receive the PDU that the transmission terminal is sent by Target Wireless carrying；Wherein, the PDU includes being used to indicate the PDU The identification field of belonged to PDCP entity, the PDU include rlc layer PDU or MAC layer PDU；

Alternatively,

Receive the mapping relations of PDCP entity that the transmission terminal is sent, carrying Target Wireless carrying and RLC entity First control signaling；

Alternatively,

Receive the second of the mapping relations of PDCP entity that the network equipment is sent, carrying Target Wireless carrying and RLC entity Control signaling.

3. data transmission method according to claim 2, which is characterized in that the PDU is the transmission terminal in PDCP Sent after repeat function configuration or activation, first control signaling be the transmissions terminal in the configuration of PDCP repeat function or It is sent before activation, second control signaling is that the network equipment is sent before PDCP repeat function configures or activates.

4. data transmission method according to claim 2, which is characterized in that the identification field is located at the PDU of the PDU In head, PDU subheader or data field, the identification field carries the number information of the belonged to PDCP entity of the PDU.

5. data transmission method according to claim 2, which is characterized in that first control signaling or the second control letter Order includes: broadcast, radio resource control RRC signaling, MAC signaling or physical layer signaling.

6. data transmission method according to claim 2, which is characterized in that first control signaling or the second control letter Order carries: Target indication information, and the Target indication information is used to indicate the logical channel number LCID and PDCP of RLC entity The mapping relations of the number information of entity, alternatively, being used to indicate at least two RLC entities corresponding to same PDCP entity LCID。

7. data transmission method according to claim 1, which is characterized in that according to the mapping of PDCP entity and RLC entity Relationship, after the step of determining the target PDCP entity that the data that the MAC layer PDU is carried are belonged to, comprising:

Detect whether the target PDCP has been established；

If having been established, the radio bearer between the target PDCP entity and RLC entity is established；

If not setting up, wirelessly holding between the target PDCP entity and the target PDCP entity and RLC entity is established It carries.

8. a kind of terminal, it is applied to receive terminal, comprising: transceiver, memory, processor and storage are on a memory and can be The computer program run on processor, which is characterized in that the processor realizes following step when executing the computer program It is rapid:

9. terminal according to claim 8, which is characterized in that the processor realized when executing the computer program with Lower step:

Alternatively,

10. terminal according to claim 9, which is characterized in that the PDU is the transmission terminal in PDCP repeat function It is sent after configuration or activation, first control signaling is transmission terminal hair before PDCP repeat function configures or activates It send, second control signaling is that the network equipment is sent before PDCP repeat function configures or activates.

11. terminal according to claim 9, which is characterized in that the identification field is located at PDU head, the PDU of the PDU In subheader or data field, the identification field carries the number information of the belonged to PDCP entity of the PDU.

12. terminal according to claim 9, which is characterized in that first control signaling or the second control signaling include: Broadcast, radio resource control RRC signaling, MAC signaling or physical layer signaling.

13. terminal according to claim 9, which is characterized in that first control signaling or the second control signaling carry Have: Target indication information, the Target indication information are used to indicate the logical channel number LCID and PDCP entity of RLC entity The mapping relations of number information, alternatively, being used to indicate the LCID of at least two RLC entities corresponding to same PDCP entity.

14. terminal according to claim 8, which is characterized in that the processor is realized when executing the computer program Following steps:

Detect whether the target PDCP has been established；

15. a kind of terminal is applied to receive terminal characterized by comprising

Module is obtained, for obtaining the Packet Data Convergence Protocol PDCP entity and Radio Link that send end objectives radio bearer The mapping relations of layer control RLC entity；Wherein, the Target Wireless is carried as the transmission terminal configuration or has activated PDCP weight The direct communication link carrying of multiple function；

Determining module, for after receiving media access control MAC layer protocol data cell PDU, according to PDCP entity and RLC The mapping relations of entity determine the target PDCP entity that the data that the MAC layer PDU is carried are belonged to.

16. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program quilt It is realized when processor executes as described in any one of claims 1 to 7 the step of data transmission method.

17. a kind of data transmission method is applied to send terminal characterized by comprising

To the Packet Data Convergence Protocol PDCP entity and Radio Link for receiving terminal or network equipment transmission Target Wireless carrying The mapping relations of layer control RLC entity；Wherein, the Target Wireless is carried as configuring or having activated the direct of PDCP repeat function Communication link carrying.

18. data transmission method according to claim 17, which is characterized in that send mesh to reception terminal or the network equipment The step of Packet Data Convergence Protocol PDCP entity and radio link layer for marking radio bearer control the mapping relations of RLC entity, Include:

It is carried by Target Wireless to the reception terminal and sends PDU；Wherein, the PDU includes being used to indicate the PDU to be returned Belong to the identification field of PDCP entity, the PDU includes rlc layer PDU or MAC layer PDU；

Alternatively,

The first control for carrying the mapping relations of PDCP entity and RLC entity that Target Wireless carries is sent to the reception terminal Signaling processed；

Alternatively,

19. data transmission method according to claim 18, which is characterized in that the PDU is that the transmission terminal exists It is sent after the configuration of PDCP repeat function or activation, first control signaling is that the transmission terminal is matched in PDCP repeat function It is sent before setting or activating, the auxiliary information is that the transmission terminal is sent before PDCP repeat function configures or activates.

20. data transmission method according to claim 19, which is characterized in that the identification field is located at the PDU's In PDU, PDU subheader or data field, the identification field carries the number information of the belonged to PDCP entity of the PDU.

21. data transmission method according to claim 19, which is characterized in that first control signaling or the second control Signaling includes: broadcast, radio resource control RRC signaling, MAC signaling or physical layer signaling.

22. data transmission method according to claim 19, which is characterized in that first control signaling or the second control Signaling carries: Target indication information, the Target indication information be used to indicate the logical channel number LCID of RLC entity with The mapping relations of the number information of PDCP entity, alternatively, being used to indicate at least two RLC entities corresponding to same PDCP entity LCID.

23. data transmission method according to claim 19, which is characterized in that carry mesh to reception terminal transmission The first control signaling of the PDCP entity of radio bearer and the mapping relations of RLC entity is marked, alternatively, sending to the network equipment After the step of carrying the PDCP entity and the auxiliary information of the mapping relations of RLC entity of Target Wireless carrying, further includes:

PDCP repeat function is activated, and sends media access control MAC layer protocol data cell PDU to the reception terminal.

24. data transmission method according to claim 23, which is characterized in that the transmission of the Xiang Suoshu network equipment carries mesh After the step of auxiliary information of the mapping relations of the PDCP entity and RLC entity of mark radio bearer, further includes:

Receive the first confirmation message that the network equipment is sent；Wherein, first confirmation message is that the network equipment exists It is sent after receiving the second confirmation message of the reception terminal feedback, second confirmation message is that the reception terminal exists It receives and sends after the second control signaling that the network equipment is sent, second control signaling is that the network equipment exists It receives and sends after the auxiliary information.

25. a kind of terminal, it is applied to send terminal, comprising: transceiver, memory, processor and storage are on a memory and can The computer program run on a processor, which is characterized in that the processor is realized following when executing the computer program Step:

To the Packet Data Convergence Protocol PDCP entity and Radio Link for receiving terminal or network equipment transmission Target Wireless carrying The mapping relations of layer control RLC entity；Wherein, the Target Wireless is carried as the transmission terminal configuration or has activated PDCP weight The direct communication link carrying of multiple function.

26. terminal according to claim 25, which is characterized in that the processor is realized when executing the computer program Following steps:

Alternatively,

27. terminal according to claim 26, which is characterized in that the PDU is the transmission terminal in PDCP repetition function Can configure or be sent after activating, first control signaling be the transmissions terminal PDCP repeat function configure or activation before It sends, the auxiliary information is that the transmission terminal is sent before PDCP repeat function configures or activates.

28. terminal according to claim 26, which is characterized in that the identification field is located at PDU head, the PDU of the PDU In subheader or data field, the identification field carries the number information of the belonged to PDCP entity of the PDU.

29. terminal according to claim 26, which is characterized in that first control signaling or the second control signaling packet It includes: broadcast, radio resource control RRC signaling, MAC signaling or physical layer signaling.

30. terminal according to claim 26, which is characterized in that first control signaling or the second control signaling carry Have: Target indication information, the Target indication information are used to indicate the logical channel number LCID and PDCP entity of RLC entity The mapping relations of number information, alternatively, being used to indicate the LCID of at least two RLC entities corresponding to same PDCP entity.

31. terminal according to claim 26, which is characterized in that the processor is realized when executing the computer program Following steps:

32. terminal according to claim 31, which is characterized in that the processor is realized when executing the computer program Following steps:

33. a kind of terminal is applied to send terminal characterized by comprising

Sending module, for real to the Packet Data Convergence Protocol PDCP for receiving terminal or network equipment transmission Target Wireless carrying The mapping relations of body and radio link layer control RLC entity；Wherein, the Target Wireless is carried as configuring or having activated PDCP weight The direct communication link carrying of multiple function.

34. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program quilt It is realized when processor executes as described in any one of claim 17 to 24 the step of data transmission method.