CN108282248B

CN108282248B - Data transmission method, network side equipment and user equipment

Info

Publication number: CN108282248B
Application number: CN201710008345.5A
Authority: CN
Inventors: 刘佳敏; 皮埃尔; 许芳丽
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2017-01-05
Filing date: 2017-01-05
Publication date: 2020-11-27
Anticipated expiration: 2037-01-05
Also published as: CN108282248A; WO2018127225A1

Abstract

The invention provides a data transmission method, network side equipment and user equipment, wherein the data transmission method comprises the following steps: the PDCP layer at the network side processes the high-level data packet to obtain PDCP PDUs, and sends the PDCP PDUs to the RLC-H layers, wherein each PDCP layer corresponds to at least one RLC-H layer; the RLC-H layer processes the received PDCP PDU to obtain RLC PDUs, and sends the RLC PDUs to the RLC-L layers, wherein each RLC-H layer corresponds to at least one RLC-L layer; the RLC-L layer processes the received RLC PDU to obtain RLC PDUs or segments, and sends the RLC PDUs or segments to the MAC layer, and each RLC-L layer corresponds to one MAC layer; and the MAC layer processes the received RLC PDU or the segments to obtain the MAC PDU, and sends the MAC PDU to the UE side. The invention can improve the network efficiency.

Description

Data transmission method, network side equipment and user equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a network side device, and a user equipment.

Background

In the future development of the mobile communication system, in order to better meet the user requirements and greatly improve the network capacity and throughput, more transmission nodes are inevitably introduced, i.e. the mobile communication system is an ultra-dense network in the future. In ultra-dense networks, high frequency small station coverage may be employed in order to achieve high transmission rates. In such a scenario, the high-frequency small stations are densely deployed, and a dual-connection or multi-connection technology may be adopted, that is, a UE (User Equipment) obtains data transmission through two or more links.

In an existing communication system, Data transmission between a UE and an eNB (evolved Node B) generally passes through transmission of PDCP (Packet Data Convergence Protocol), RLC (Radio Link Control), MAC (Media Access Control) and PHY (Physical Layer). As shown in fig. 1, it is a user plane protocol stack in the existing mobile communication system. Each layer performs a different data processing. PDCP mainly performs security operations and Header Compression/decompression processing, such as ciphering and integrity protection, ROHC (Robust Header Compression) Compression/decompression, and the like; the RLC mainly completes segmented concatenation and sequential delivery of data and ARQ (Automatic Repeat Request) data transmission guarantee; the MAC mainly completes scheduling, cascade processing of different logical channels, and HARQ (Hybrid Automatic Repeat Request) operation; the physical layer completes transmission block packetization and air interface transmission.

Referring to fig. 2, in a dual connectivity architecture, user data may be split between different enbs.

In the prior art, each logical channel corresponds to a three-layer L2 sub-entity (PDCP, RLC and MAC). In case of single connection, each logical channel has separate PDCP and RLC layers, and multiplexes MAC layers, and RLC performs direct feedback and retransmission between itself and a peer. In the case of dual connectivity Bearer separation (Split Bearer), each logical channel has a separate PDCP layer, each link has its own RLC layer below the PDCP layer, and the RLC layer of each link performs its own feedback and retransmission independently.

In the two prior arts, there is no situation of comprehensive processing of transmission states of two or more links, and cooperation of feedback and retransmission is lacked, and when one link becomes worse, the repair cannot be performed in time, and network efficiency is reduced.

Disclosure of Invention

In view of this, the present invention provides a data transmission method, a network side device and a user equipment, so as to improve network efficiency.

In order to solve the above technical problem, the present invention provides a data transmission method, applied to a network side, including:

the packet data convergence protocol PDCP layer processes the received high-level data packet to obtain a PDCP protocol data unit PDU and sends the PDCP protocol data unit PDU to a radio link layer control protocol high RLC-H layer, wherein each PDCP layer corresponds to at least one RLC-H layer;

the RLC-H layer processes the received PDCP PDU to obtain the RLC PDU and sends the RLC PDU to a radio link layer control protocol-low RLC-L layer, wherein each RLC-H layer corresponds to at least one RLC-L layer;

the RLC-L layer processes the received RLC PDUs to obtain RLC PDUs or RLC PDU segments and sends the RLC PDUs or the RLC PDU segments to a Medium Access Control (MAC) layer, wherein each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer;

and the MAC layer processes the received RLC PDU or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the UE side.

Preferably, each RLC-H layer corresponds to at least two RLC-L layers.

Preferably, the step of the RLC-H layer transmitting the RLC PDU to the RLC-L layer includes:

the RLC-H layer shunts the RLC PDUs, and sends the shunted RLC PDUs to at least two RLC-L layers respectively; or

The RLC-H layer copies the RLC PDUs, and respectively sends the copied RLC PDUs to at least two RLC-L layers; or

The RLC-H layer selects one link from at least two links and sends the RLC PDU to the RLC-L layer corresponding to the selected link.

Preferably, the PDCP layer processes the received higher layer packet to obtain a PDCP PDU, and sends the PDCP PDU to the RLC-H layer, including:

a caching step: the PDCP layer processes the received high-level data packet to obtain a PDCP Service Data Unit (SDU) and stores the PDCP SDU in a cache;

a pretreatment step: the PDCP layer acquires a first number of PDCP SDUs from the cache and processes the first number of PDCP SDUs, wherein the process comprises distributing sequence numbers SN for the first number of PDCP SDUs to obtain PDCP PDUs;

a sending step: the PDCP layer sends the PDCP PDU to the RLC-H layer;

a supplement step: and returning to the preprocessing step when a second number of MAC PDUs in the MAC PDUs corresponding to the first number of PDCP SDUs are transmitted.

Preferably, the first number is determined in the following manner:

a first number N1 × GBR, where N1 is a positive integer; or

A first number N1 × PBR, wherein N1 is a positive integer; or

The first number is N1 × M, where N1 is a positive integer and M is the actual amount of data scheduled each TTI before.

Preferably, the step of the RLC-H layer processing the received PDCP PDU to obtain an RLC PDU and sending the RLC PDU to the RLC-L layer includes:

a caching step: the RLC-H layer processes the received PDCP PDU to obtain RLC SDU and stores the RLC SDU in a cache;

a pretreatment step: the RLC-H layer acquires a third number of RLC SDUs from the cache and processes the third number of RLC SDUs, wherein SN is distributed to the third number of RLC SDUs to obtain RLC PDUs;

a sending step: the RLC-H layer sends the RLC PDU to an RLC-L layer;

a supplement step: and when the fourth number of MAC PDUs in the MAC PDUs corresponding to the third number of RLC SDUs are sent, returning to the preprocessing step.

Preferably, the third number is determined in the following manner:

a third number of N2 × GBR, where N2 is a positive integer; or

A third number of N2 × PBR, where N2 is a positive integer; or

The third number is N2 × M, where N2 is a positive integer and M is the actual amount of data scheduled per TTI before.

Preferably, the step of the RLC-L layer processing the received RLC PDU to obtain an RLC PDU or an RLC PDU segment, and sending the RLC PDU segment to the MAC layer includes:

the RLC-L layer stores the received RLC PDU in a cache;

and when the transmission opportunity of the MAC layer is reached, the RLC-L layer processes the cached RLC PDU to obtain the RLC PDU or segments of the RLC PDU and sends the RLC PDU to the MAC layer.

Preferably, the data transmission method further includes:

when the RLC-H layer receives a packet loss state report fed back by an RLC layer of a UE side, determining an RLC PDU (protocol data Unit) which needs to be retransmitted and is specified in the packet loss state report or an RLC PDU segment; acquiring RLC PDU or RLC PDU segments needing retransmission and sending the RLC PDU segments to an RLC-L layer;

the RLC-L layer sends the received RLC PDU needing retransmission or the RLC PDU segment to an MAC layer;

and the MAC layer processes the received RLC PDU needing to be retransmitted or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the UE side.

Preferably, the RLC PDU or RLC PDU segment to be retransmitted and/or the interface information of the RLC-H layer and the RLC-L layer includes a flag indicating that the current RLC PDU or RLC PDU segment is a retransmission packet.

Preferably, each RLC-H layer corresponds to at least two RLC-L layers, and the step of acquiring the RLC PDU or RLC PDU segment to be retransmitted and sending the RLC PDU or RLC PDU segment to the RLC-L layer includes:

the RLC-H layer selects one link with the link condition better than that of other links from at least two links and sends the RLC PDU to the RLC-L layer corresponding to the selected link.

Preferably, the step of sending the received RLC PDU or RLC PDU segment to be retransmitted by the RLC-L layer to the corresponding MAC layer of the network side includes:

and when the RLC-L layer receives the RLC PDU or the RLC PDU segment which needs to be retransmitted, the RLC PDU or the RLC PDU segment which needs to be retransmitted is preferentially sent to the MAC layer.

Preferably, the data transmission method is applied to a radio transmission network of a centralized unit CU-distributed unit DU architecture, and the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and the MAC layer are positioned in a DU; or

The data transmission method is applied to a wireless transmission network of a new wireless NR dual-connection or multi-connection architecture, and the PDCP layer and the RLC-H layer are positioned in a main evolution type base station (MeNB); or

The data transmission method is applied to a wireless transmission network of an NR-LTE interconnection interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.

The invention also provides a data transmission method, which is applied to the UE side and comprises the following steps:

the medium access control MAC layer processes the received MAC protocol data unit PDU to obtain a radio link layer control protocol RLC PDU or an RLC PDU segment and sends the RLC PDU segment to a corresponding RLC layer, wherein each RLC layer corresponds to a plurality of MAC layers;

the RLC layer carries out comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain complete RLC PDUs, acquires the PDCP PDUs from the complete RLC PDUs, and sends the PDCP packet data convergence protocol PDUs to the PDCP layers, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC layer;

and the PDCP layer processes the received PDCP PDU to obtain a PDCP service data unit SDU and delivers the PDCP service data unit SDU to a high layer.

Preferably, the step of the RLC layer performing comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers includes:

the RLC layer sequences the received RLC PDUs or RLC PDU segments sent by different MAC layers, judges whether packet loss exists according to a sequencing result, and sends a packet loss state report to an RLC-H layer of a network side when the packet loss exists.

Preferably, the step of the RLC layer sequencing the received RLC PDUs or RLC PDU segments sent by different MAC layers, and determining whether there is packet loss according to the sequencing result includes:

the RLC layer sequences the received RLC PDU or the RLC PDU segments according to the serial number of the received RLC PDU or the RLC PDU segments, and judges whether the RLC PDU or the RLC PDU segments with missing serial numbers exist or not;

when the RLC PDU with the missing sequence number or the RLC PDU segment exists, starting a reordering timer;

and when the reordering timer is overtime and the RLC PDU or the RLC PDU segment with the missing sequence number is not received, judging that packet loss exists.

the packet data convergence protocol PDCP layer processes the received high-level data packet to obtain a PDCP protocol data unit PDU and sends the PDCP protocol data unit PDU to a radio link layer control protocol RLC layer, wherein each PDCP layer corresponds to at least one RLC layer;

the RLC layer processes the received PDCP PDU to obtain the RLC PDU or RLC PDU segments and sends the RLC PDU or the RLC PDU segments to a medium access control MAC layer, wherein each RLC layer corresponds to at least two MAC layers;

and the MAC layer processes the received RLC PDU or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the network side.

Preferably, the data transmission method further includes:

when the RLC layer receives a packet loss state report fed back by an RLC-H layer of a network side, determining an RLC PDU (protocol data Unit) or an RLC PDU segment which needs to be retransmitted and is specified in the packet loss state report; acquiring RLC PDU or RLC PDU segments needing to be retransmitted and sending the RLC PDU segments to an MAC layer;

and the MAC layer processes the received RLC PDU or RLC PDU segment which needs to be retransmitted to obtain the MAC PDU and sends the MAC PDU to a network side.

Preferably, the step of acquiring the RLC PDU or RLC PDU segment to be retransmitted and sending the RLC PDU or RLC PDU segment to the MAC layer includes:

and the RLC layer acquires the link of the latest uplink resource and sends the RLC PDU needing to be retransmitted or the RLC PDU to the MAC layer corresponding to the link of the latest uplink resource in a segmented manner.

The invention also provides a data transmission method, which is applied to a network side and comprises the following steps:

a Medium Access Control (MAC) layer processes received MAC Protocol Data Units (PDU) to obtain a radio link layer control protocol (RLC PDU) or an RLC PDU segment and sends the RLC PDU segment to a corresponding radio link layer control protocol-low RLC-L layer, wherein each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer corresponds to one MAC layer;

the RLC-L layer transmits the received RLC PDU or RLC PDU segments to a radio link layer control protocol-high RLC-H layer, wherein each RLC-H layer corresponds to at least one RLC-L layer;

the RLC-H layer processes the received RLC PDU or the RLC PDU segments to obtain a complete RLC PDU, obtains a packet data convergence protocol PDCP PDU from the complete RLC PDU and sends the PDCP PDU to the PDCP layers, wherein each RLC-H layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;

Preferably, each RLC-H layer corresponds to at least two RLC-L layers, and the step of processing the received RLC PDU or RLC PDU segments by the RLC-H layer to obtain a complete RLC PDU includes:

and the RLC-H layer carries out comprehensive processing on the received RLC PDUs or the RLC PDU segments sent by different RLC-L layers to obtain the complete RLC PDU.

Preferably, the step of the RLC-H layer processing the received RLC PDU or RLC PDU segment includes:

the RLC-H layer sequences the received RLC PDUs or RLC PDU segments sent by different RLC-L layers, judges whether packet loss exists according to a sequencing result, and sends a packet loss state report to an RLC layer of a User Equipment (UE) side when the packet loss exists.

Preferably, the RLC-H layer sequences the received RLC PDUs or RLC PDU segments sent by different RLC-L layers, and the step of determining whether there is a packet loss according to the sequencing result includes:

the RLC-H layer sequences the received RLC PDUs or the received RLC PDU segments according to the serial numbers of the RLC PDUs or the received RLC PDU segments, and judges whether the RLC PDUs or the RLC PDU segments with missing serial numbers exist or not;

The present invention also provides a network side device, including:

the packet data convergence protocol PDCP layer is used for processing the received high-level data packet to obtain a PDCP protocol data unit PDU and sending the PDCP protocol data unit PDU to a radio link layer control protocol high RLC-H layer, wherein each PDCP layer corresponds to at least one RLC-H layer;

the RLC-H layer is used for processing the received PDCP PDU to obtain a radio link layer control protocol RLC PDU and sending the RLC PDU to at least one radio link layer control protocol-low RLC-L layer, wherein each RLC-H layer corresponds to at least one RLC-L layer;

the RLC-L layers are used for processing the received RLC PDUs to obtain the RLC PDUs or RLC PDU segments and sending the RLC PDUs or the RLC PDU segments to the medium access control MAC layer, wherein each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer;

and the MAC layer is used for processing the received RLC PDU or RLC PDU segments to obtain the MAC PDU and sending the MAC PDU to the UE side.

Preferably, each RLC-H layer corresponds to at least two RLC-L layers.

Preferably, the RLC-H layer includes:

the first routing module is used for shunting the RLC PDUs and respectively sending the shunted RLC PDUs to at least two RLC-L layers; or

The second routing module is used for copying the RLC PDUs and respectively sending the copied RLC PDUs to at least two RLC-L layers; or

And the third routing module is used for selecting one link from the at least two links and sending the RLC PDU to the RLC-L layer corresponding to the selected link.

Preferably, the PDCP layer includes:

the first cache module is used for processing the received high-level data packet to obtain a PDCP Service Data Unit (SDU) and storing the PDCP SDU in a cache;

a first preprocessing module, configured to obtain a first number of PDCP SDUs from the buffer, and process the first number of PDCP SDUs, where the first preprocessing module includes allocating sequence numbers SN to the first number of PDCP SDUs to obtain PDCP PDUs;

a first sending module, configured to send a PDCP PDU to an RLC-H layer;

and the supplementing module is used for controlling the first preprocessing module and the first sending module to continue working when a second number of MAC PDUs in the MAC PDUs corresponding to the first number of PDCP SDUs are sent.

Preferably, the first number is determined in the following manner:

a first number N1 × GBR, where N1 is a positive integer; or

A first number N1 × PBR, wherein N1 is a positive integer; or

Preferably, the RLC-H layer includes:

the second buffer module is used for processing the received PDCP PDU to obtain RLC SDU and storing the RLC SDU in a buffer;

a second preprocessing module, configured to obtain a third number of RLC SDUs from the buffer, and process the third number of RLC SDUs, where the step of allocating SNs to the third number of RLC SDUs includes obtaining RLC PDUs;

the second sending module is used for sending the RLC PDU to the RLC-L layer;

and the second supplementing module is used for controlling the second preprocessing module and the second sending module to continue working when a fourth number of MAC PDUs corresponding to the third number of RLC SDUs are sent.

Preferably, the third number is determined in the following manner:

a third number of N2 × GBR, where N2 is a positive integer; or

A third number of N2 × PBR, where N2 is a positive integer; or

Preferably, the RLC-L layer includes:

the buffer module is used for storing the received RLC PDU in a buffer;

and the sending module is used for processing the cached RLC PDU when the transmission opportunity of the MAC layer is reached to obtain the RLC PDU or RLC PDU segments and sending the RLC PDU segments to the MAC layer.

Preferably, the RLC-H layer is further configured to determine, when a packet loss status report fed back by the RLC layer of the UE side is received, an RLC PDU or an RLC PDU segment that needs to be retransmitted and is specified in the packet loss status report; acquiring RLC PDU or RLC PDU segments needing retransmission and sending the RLC PDU segments to an RLC-L layer;

the RLC-L layer is also used for sending the received RLC PDU needing retransmission or the RLC PDU segment to the MAC layer;

the MAC layer is further configured to process the received RLC PDU or RLC PDU segment that needs to be retransmitted to obtain an MAC PDU, and send the MAC PDU to the UE side.

Preferably, each RLC-H layer corresponds to at least two RLC-L layers,

and the RLC-H layer is also used for selecting one link with the link condition better than that of other links from the at least two links and sending the RLC PDU to the RLC-L layer corresponding to the selected link.

Preferably, the RLC-L layer is further configured to preferentially send the RLC PDU or RLC PDU segment that needs to be retransmitted to the MAC layer when receiving the RLC PDU or RLC PDU segment that needs to be retransmitted.

Preferably, the network side device is applied to a radio transmission network of a centralized unit CU-distributed unit DU architecture, and the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and the MAC layer are positioned in a DU; or

The network side equipment is applied to a wireless transmission network of a new wireless NR dual-connection or multi-connection architecture, and the PDCP layer and the RLC-H layer are positioned in a main evolution type base station (MeNB); or

The network side equipment is applied to a radio transmission network of an NR-LTE interconnection interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.

The present invention also provides a user equipment, comprising:

the medium access control MAC layer is used for processing the received MAC protocol data unit PDU to obtain a radio link layer control protocol RLC PDU or an RLC PDU segment and sending the RLC PDU segment to the corresponding RLC layers, wherein each RLC layer corresponds to a plurality of MAC layers;

the RLC layer is used for comprehensively processing the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain complete RLC PDUs, obtaining packet data convergence protocol PDCP PDUs from the complete RLC PDUs, and sending the PDCP PDUs to the PDCP layers, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC layer;

and the PDCP layer is used for processing the received PDCP PDU to obtain a PDCP service data unit SDU and delivering the PDCP service data unit SDU to a high layer.

Preferably, the RLC layer is further configured to sequence the received RLC PDUs or RLC PDU segments sent by different MAC layers, determine whether packet loss exists according to a sequencing result, and send a packet loss status report to a radio link layer control protocol-high RLC-H layer on the network side when the packet loss exists.

Preferably, the RLC layer is further configured to sequence the received RLC PDU or RLC PDU segments according to a sequence number of the received RLC PDU or RLC PDU segment, and determine whether an RLC PDU or RLC PDU segment with a missing sequence number exists; when the RLC PDU with the missing sequence number or the RLC PDU segment exists, starting a reordering timer; and when the reordering timer is overtime and the RLC PDU or the RLC PDU segment with the missing sequence number is not received, judging that packet loss exists.

The present invention also provides a user equipment, comprising:

a packet data convergence protocol PDCP layer, which is used for processing the received high-level data packet to obtain a PDCP protocol data unit PDU and sending the PDU to a radio link layer control protocol RLC layer, wherein each PDCP layer corresponds to at least one RLC layer;

the RLC layers are used for processing the received PDCP PDU to obtain the RLC PDU or RLC PDU segments and sending the RLC PDU or the RLC PDU segments to the medium access control MAC layer, wherein each RLC layer corresponds to at least two MAC layers;

and the MAC layer is used for processing the received RLC PDU or RLC PDU segments to obtain the MAC PDU and sending the MAC PDU to the network side.

Preferably, the RLC layer is further configured to determine, when receiving a packet loss status report fed back by a radio link layer control protocol-high RLC-H layer on a network side, an RLC PDU or an RLC PDU segment that needs to be retransmitted and is specified in the packet loss status report; acquiring RLC PDU or RLC PDU segments needing to be retransmitted and sending the RLC PDU segments to an MAC layer;

the MAC layer is further configured to process the received RLC PDU or RLC PDU segment that needs to be retransmitted to obtain an MAC PDU, and send the MAC PDU to a network side.

Preferably, the RLC layer is further configured to acquire a link of a latest uplink resource, and send an RLC PDU that needs to be retransmitted or an RLC PDU segment to a MAC layer corresponding to the link of the latest uplink resource.

The present invention also provides a network side device, including:

the medium access control MAC layer is used for processing the received MAC protocol data unit PDU to obtain a radio link layer control protocol RLC PDU or an RLC PDU segment and sending the RLC PDU segment to a corresponding radio link layer control protocol-low RLC-L layer, wherein each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer corresponds to one MAC layer;

the RLC-L layer is used for transmitting the received RLC PDU or the RLC PDU to a corresponding radio link layer control protocol-high RLC-H layer in a segmented mode, wherein each RLC-H layer corresponds to at least one RLC-L layer;

the RLC-H layer is used for processing the received RLC PDU or the RLC PDU segments to obtain a complete RLC PDU, obtaining a packet data convergence protocol PDCP PDU from the complete RLC PDU and sending the PDCP PDU to the PDCP layers of the network side, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;

Preferably, each RLC-H layer corresponds to at least two RLC-L layers,

the RLC-H layer is also used for comprehensively processing the received RLC PDUs or RLC PDU segments sent by different RLC-L layers to obtain complete RLC PDUs.

Preferably, the RLC-H layer is further configured to sequence the RLC PDUs or RLC PDU segments received from different RLC-L layers, determine whether packet loss exists according to a sequencing result, and send a packet loss status report to the RLC layer of the UE side when packet loss exists.

Preferably, the RLC-H layer is further configured to sequence the received RLC PDUs or RLC PDU segments according to sequence numbers of the received RLC PDUs or RLC PDU segments, and determine whether RLC PDUs or RLC PDU segments with missing sequence numbers exist; when the RLC PDU with the missing sequence number or the RLC PDU segment exists, starting a reordering timer; and when the reordering timer is overtime and the RLC PDU or the RLC PDU segment with the missing sequence number is not received, judging that packet loss exists.

The technical scheme of the invention has the following beneficial effects:

the RLC-H layer of the network side and the RLC layer of the UE side can perform comprehensive processing on the conditions of the multiple paths, for example, selection of the multiple paths, receiving and sorting, reassembly, state feedback, and retransmission of data on the multiple paths, thereby improving network efficiency.

Drawings

Fig. 1 is a user plane protocol stack in a conventional mobile communication system;

FIG. 2 is a prior art dual connectivity wireless protocol architecture;

fig. 3 is a flowchart illustrating a data transmission method according to a first embodiment of the invention;

FIG. 4 is a diagram illustrating a structure of PDCP PDUs;

fig. 5 is a schematic diagram illustrating a method of a buffering mechanism of a PDCP layer on a network side according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating the structure of an RLC PDU;

fig. 7 is a schematic diagram illustrating a method of a buffering mechanism of an RLC-H layer on a network side according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating a data transmission method according to a second embodiment of the present invention;

fig. 9 is a flowchart illustrating a data transmission method according to a third embodiment of the present invention;

fig. 10 is a flowchart illustrating a data transmission method according to a fourth embodiment of the present invention;

fig. 11 is a schematic flowchart of a data transmission method according to a fifth embodiment of the present invention;

fig. 12 is a flowchart illustrating a data transmission method according to a sixth embodiment of the present invention;

fig. 13 is a schematic structural diagram of a radio transmission network with a CU-DU architecture according to a seventh embodiment of the present invention;

fig. 14 is a schematic structural diagram of a radio transmission network of an NR dual connectivity or multi connectivity architecture according to an eighth embodiment of the present invention;

fig. 15 is a schematic structural diagram of a radio transmission network of an NR-LTE interworking architecture according to a ninth embodiment of the present invention;

fig. 16 is an architecture diagram of a network-side device according to a tenth embodiment of the present invention;

fig. 17 is an architecture diagram of a ue according to an eleventh embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

First, a network side device architecture according to an embodiment of the present invention will be described.

The network side device in the embodiment of the invention comprises a PDCP layer, an RLC-H layer, an RLC-L layer and an MAC layer, namely, the existing RLC layer is divided into an RLC-H (RLC-High) entity and an RLC-L (RLC-Low) entity, wherein the RLC-H layer is mainly responsible for data sequential delivery and ARQ (Automatic Repeat Request) data transmission guarantee, and the RLC-L layer is mainly responsible for data segmentation and concatenation. Each PDCP layer corresponds to at least one RLC-H layer, each RLC-H layer corresponds to at least one RLC-L layer, each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer.

Example one

Referring to fig. 3, an embodiment of the present invention provides a data transmission method, where the data transmission method is applied to initial downlink transmission on a network side, and the data transmission method includes:

step 31: a PDCP layer at a network side processes a received high-level Data packet to obtain a PDCP PDU (Protocol Data Unit) and sends the PDCP PDU to an RLC-H layer at the network side, wherein each PDCP layer corresponds to at least one RLC-H layer;

step 32: the RLC-H layer processes the received PDCP PDU to obtain RLC PDUs and sends the RLC PDUs to RLC-L layers on a network side, wherein each RLC-H layer corresponds to at least one RLC-L layer;

step 33: the RLC-L layer processes the received RLC PDUs to obtain RLC PDUs or RLC PDU segments and sends the RLC PDUs or the RLC PDU segments to an MAC layer on a network side, wherein each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer;

step 34: and the MAC layer processes the received RLC PDU or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the UE side.

In the embodiment of the present invention, preferably, each PDCP layer corresponds to one RLC-H layer, that is, the PDCP layer and the RLC-H layer correspond to each other one by one, and there is only one RLC-H on each logical channel.

In the embodiment of the present invention, preferably, each RLC-H layer corresponds to at least two RLC-L layers, that is, each RLC-H corresponds to at least two paths (leg), so that the RLC-H layer can comprehensively process the conditions on the multiple paths, for example, the link quality of the multiple paths can be comprehensively considered, and the path with the best link quality is selected to transmit data, so as to transmit the data as soon as possible. In addition, when the link quality of one path is poor, the other path can be switched to in time for remediation, so that the user experience can be improved, and the network efficiency can be improved.

The procedure of the PDCP layer, the RLC-H layer, the RLC-L layer, and the MAC layer for data will be described in detail below.

The PDCP layer mainly performs security operations and Header Compression and decompression processes, such as ciphering and integrity protection, ROHC (Robust Header Compression) Compression and decompression, and specifically includes:

1) assigning SNs (sequence numbers) to PDCP SDUs (service data units), each SDU corresponding to a unique SN and being assigned in sequence;

2) performing header compression on the data packet according to the configuration;

3) depending on the configuration, security operations, including integrity protection and encryption, are performed on the data packet.

The PDCP processes the received high-level data packet to obtain a PCDP SDU, encapsulates the PDCP SDU to obtain a PDCP PDU (service data unit), please refer to fig. 4, where fig. 4 is a schematic structural diagram of the PDCP PDU, and as can be seen from fig. 4, the PDCP PDU is composed of the PDCP SDU and a PDCP header.

The PDCP layer has Discard function for the data packet, i.e. when the data packet is still not sent after the Discard timer expires, the data packet needs to be deleted, and if the expired data packet has already allocated PDCP SN and passed through the PDCP layer, and even has reached the SN allocated to the RLC layer, the deletion of the data packet will cause the entire SN sequence to be broken, and an additional mechanism is needed to confirm this fact by both the transmitting and receiving parties. In order to avoid introducing a complicated interaction process of the two transceivers for deleting events, in the embodiment of the invention, the following method is adopted to avoid deleting the data packet which is distributed with the PDCP SN:

referring to fig. 5, the step of the PDCP layer of the network processing the received higher layer packet to obtain a PDCP PDU, and sending the PDCP PDU to the RLC-H layer of the network may include:

a caching step 51: the PDCP layer processes a high-level data packet to obtain a PDCP SDU and stores the PDCP SDU in a cache;

a preprocessing step 52: the PDCP layer acquires a first number of PDCP SDUs from the cache, and processes the first number of PDCP SDUs, wherein SN is distributed to the first number of PDCP SDUs to obtain PDCP PDUs;

a transmission step 53: the PDCP layer sends the PDCP PDU to the RLC-H layer;

a supplementary step 54: and when judging whether a second number of MAC PDUs in the MAC PDUs corresponding to the first number of PDCP SDUs are sent, if so, returning to the preprocessing step 52, otherwise, continuing to execute a supplementing step 54.

The supplementary step is used for continuing to carry out the PDCP processing on the rest data packets in the cache according to the first-in first-out sequence once the data packet part subjected to the PDCP processing is sent out, so that the data packets subjected to the PDCP processing can be sent by an air interface enough, and the sending rate is not influenced.

After the caching step 51, the method further includes:

the PDCP layer judges whether the PDCP SDU stored in the cache is overtime, and when the PDCP SDU stored in the cache is overtime, the overtime PDCP SDU stored in the cache is directly deleted.

In the embodiment of the invention, when receiving a high-level data packet, the PDCP layer does not immediately process the PDCP layer, but stores the form of one PDCP SDU in the buffer memory, distributes SN for only a small part of PDCP SDUs stored in the buffer memory and sends the SN to the RLC-H layer, and the data packets can be quickly transferred out and then sequentially distribute SN for the rest SDUs in the buffer memory. When a certain data packet is overtime, the data packet can be directly deleted from the cache, and because the data packet stored in the cache is not allocated with SN, the deletion of the data packet will not cause the whole SN sequence to have a gap, and an additional mechanism is not needed for confirmation of the receiving and transmitting parties.

For example, if the currently received upper layer packets 1-5 are assigned SN 1 and SN 2, and are sent out according to the schedule, the remaining 3 packets are stored in the buffer, if the 3 rd packet is overtime in the process, the packet can be directly deleted from the buffer, and SN 3 … … is marked for the 4 th packet so that SN of PDCP PDU is continuous and no Gap needs to be processed.

The first number may be determined according to current scheduling information and/or transmission conditions, and specifically, may be determined in the following manner:

1) a first number N1 × GBR (guaranteed bit rate), where N1 is a positive integer; or

2) A first number N1 × PBR (priority bit rate), where N1 is a positive integer; or

3) The first number is N1 × M, where N1 is a positive integer and M is the actual amount of data scheduled per TTI (transmission time interval) before.

The above calculation method can ensure that the first number of data packets processed by the PCDP can satisfy the transmission of N1 TTIs, the value of N1 is determined by the current link quality, if the current link is more smooth in transmission and is farther from the timeout, the value of N1 may be larger, otherwise, it is smaller.

Due to the adoption of the buffering mechanism, the SNs of the PDCP PDUs are continuous, no Gap needs to be processed, and therefore, the data packets which are distributed with the PDCP SNs once are not allowed to be deleted and must be continuously transmitted to the opposite end can be stipulated in the standard.

The RLC-H layer is mainly responsible for data in-sequence delivery and ARQ (Automatic Repeat Request) data transmission guarantee. Specifically, RLC SN allocation and transmission window determination are performed, and if AM (acknowledged mode), whether Polling bit is carried or not needs to be considered, and the RLC PDU is finally formed.

Generally, the RLC PDU includes one PDCP PDU, but may also include several PDCP PDUs, please refer to fig. 6. The RLC may multiplex the PDCP SNs when the RLC PDUs and PDCP PDUs correspond one to one.

In the embodiment of the present invention, the RLC-H layer may also perform the above buffering mechanism on the data packet, so as to avoid deleting the data packet to which the RLC SN has been allocated, mainly because when the RLC-H layer has its own independent RLC SN, it is equivalent to that a gap is not allowed to occur only by the RLC SN, and at this time, because two layers of SNs are provided, that is, the RLC and PDCP each have one SN, the packet loss of the PDCP PDU is not particularly sensitive to the PDCP layer, that is, the PDCP PDU may be discarded, at this time, the PDCP may not buffer the data packet, once the data packet is received, the data packet is sent to the RLC-H buffer after being processed, a large number of RLC SDUs are buffered by the RLC-H, and a small number of RLC SDUs buffered are processed to obtain the RLC PDU, which is sent to the MAC layer to wait for transmission.

Specifically, in the embodiment of the present invention, the following method may be adopted to avoid deleting the data packet to which the RLC SN has been allocated:

referring to fig. 7, the RLC-H layer processes the received PDCP PDU to obtain an RLC PDU, and sends the RLC PDU to an RLC-L layer of the network side, including:

a caching step 71: the RLC-H layer processes the received PDCP PDU to obtain RLC SDU and stores the RLC SDU in a cache;

a pre-processing step 72: the RLC-H layer acquires a third number of RLC SDUs from the cache and processes the third number of RLC SDUs, wherein SN is distributed to the third number of RLC SDUs to obtain RLC PDUs;

a sending step 73: the RLC-H layer sends the RLC PDU to an RLC-L layer;

a supplementary step 74: and returning to the preprocessing step 72 when the fourth number of MAC PDUs in the MAC PDUs corresponding to the third number of RLC SDUs are sent.

The supplementary step is used for continuing to process the RLC layer on the rest data packets in the cache according to the first-in first-out sequence once the data packet part processed by the RLC layer is sent out, so that the data packet processed by the RLC layer can be sent by an air interface enough without influencing the sending rate.

After the buffering step 71, the method further includes:

and the RLC-H layer judges whether the RLC SDU stored in the cache is overtime or not, and directly deletes the overtime RLC SDU stored in the cache when the RLC SDU stored in the cache is overtime.

In the embodiment of the invention, when receiving the PDCP PDU, the RLC-H layer does not immediately process the RLC layer, but stores the PDCP PDU in a buffer in the form of RLC SDU, only processes the RLC layer for a small part of data packets stored in the buffer, distributes SN for the small part of data packets and sends the SN to the RLC-L layer, the data can be quickly transmitted out, and then processes the RLC layer for the rest of data packets in the buffer in sequence. When a certain data packet is overtime, the data packet can be directly deleted from the cache, and because the data packet stored in the cache is not allocated with SN, the deletion of the data packet will not cause the whole SN sequence to have a gap, and an additional mechanism is not needed for confirmation of the receiving and transmitting parties.

The third quantity may be determined according to the current scheduling information and/or transmission condition, and specifically, may be determined in the following manner:

1) a third number of N2 × GBR, where N2 is a positive integer; or

2) A third number of N2 × PBR, where N2 is a positive integer; or

3) The third number is N2 × M, where N2 is a positive integer and M is the actual amount of data scheduled per TTI before.

The above calculation method can ensure that the third number of data packets processed by the RLC can meet the requirement of transmitting N2 TTIs, the value of N2 is determined by the current link quality, if the current link is more smooth in transmission and is farther from the timeout, the value of N2 may be larger, and vice versa, the value is smaller.

Due to the above buffering mechanism, SN of RLC PDU is continuous, and there is no Gap to process, so that once the RLC SN packet is allocated, it is not allowed to be deleted, and it must be continuously transmitted to the opposite end.

When each RLC-H layer corresponds to at least two RLC-L layers, the RLC-H layer has a certain routing mechanism for a path to which data is delivered, and can select to which RLC-L the RLC PDU is to be sent by adopting the following sending methods:

(1) bearer split delivery

The bearer split transmission means: and the RLC-H layer shunts the RLC PDUs and respectively sends the shunted RLC PDUs to at least two RLC-L layers.

For example, the RLC-H layer corresponds to two RLC-L layers, that is, the logical channel corresponding to the RLC-H layer corresponds to two data transmission paths, and when the two paths have equal rates, the packets 0, 2, 4, 6, 8 … … may be sent to one path, and the

packets

1, 3, 5, 7, 9 … … may be sent to the other path. If the rate difference between the two paths is large, the sending condition and the load condition of the two paths can be considered, and the data packets are sent in a shunting manner by combining the feedback of the flow control mechanism, so that the data can be sent to the opposite end in sequence as soon as possible.

The main characteristic of the bearer separation sending mode is that a plurality of links transmit simultaneously, and different data are transmitted.

(2) Duplicate transmission

The duplicate transmission means: and the RLC-H layer copies the RLC PDUs and respectively sends the copied RLC PDUs to at least two RLC-L layers.

The duplication sending mode mainly aims at some data which is important or has high requirements on reliability and time delay, and the data can be duplicated and then sent on two or more links simultaneously.

The main characteristic of the duplication sending mode is that a plurality of links are simultaneously transmitted, and the same data is transmitted.

(3) Selective transmission

The selective transmission means: the RLC-H layer selects one link from at least two links and sends the RLC PDU to an RLC-L layer corresponding to the selected link.

Specifically, the RLC-H layer may select one of the links with the best quality to transmit according to the link qualities of at least two links.

The main feature of the selective transmission method is that most of the time is to select one of the links for transmission.

The RLC-L layer is mainly responsible for segmentation concatenation of data.

Preferably, the step of the RLC-L layer processing the received RLC PDU to obtain an RLC PDU or an RLC PDU segment, and sending the RLC PDU segment to the MAC layer of the network side includes:

the RLC-L layer stores the received RLC PDU in a cache;

Specifically, when the transmission opportunity of the MAC layer is reached, the RLC-L layer performs appropriate concatenation and segmentation on the RLC PDU according to the size of the resource obtained by the scheduling of the MAC layer, and sends the RLC PDU to the MAC layer.

The MAC layer mainly completes scheduling, cascading processing of different logic channels and HARQ operation.

In the embodiment of the invention, each MAC layer can correspond to a plurality of RLC-L layers, and when a plurality of logical channels exist, data of different logical channels can be multiplexed in the MAC layer, namely a plurality of RLC PDUs or RLC PDU segments of different logical channels can be multiplexed into one MAC PDU.

The above data transmission method of the present invention can be applied to various types of wireless transmission networks, and the following examples are given:

1) the data transmission method may be applied to a radio transmission network of a CU-DU (centralized unit-distributed unit) architecture when the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and the MAC layer are positioned in a DU;

2) the data transmission method can be applied to a radio transmission network of an NR dual-connection or multi-connection architecture, wherein the PDCP layer and the RLC-H layer are positioned in an MeNB;

3) the data transmission method can be applied to a Radio transmission network of an NR (New Radio) -LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.

That is to say, the data transmission method of the embodiment of the present invention can be implemented in a 5G system and in cross-system content.

The following describes a UE-side device architecture according to an embodiment of the present invention.

The UE side equipment comprises PDCP layers, RLC layers and MAC layers, wherein each PDCP layer corresponds to at least one RLC layer, and each RLC layer corresponds to a plurality of MAC layers.

Example two

Referring to fig. 8, a second embodiment of the present invention provides a data transmission method, where the data transmission method is applied to downlink reception on a UE side, and the data transmission method includes:

step 81: the MAC layer of the UE side processes the received MAC PDU to obtain RLC PDUs or RLC PDU segments and sends the RLC PDU segments to corresponding RLC layers, wherein each RLC layer corresponds to a plurality of MAC layers;

in the embodiment of the invention, the MAC layer does not distinguish RLC PDU segments or RLC PDU segments and performs the same processing, and the MAC layer can determine the RLC layer to which the RLC PDU or the RLC PDU segments belong according to the logical channel ID in the RLC PDU or the RLC PDU segments by acquiring the logical channel ID in the RLC PDU or the RLC PDU segments.

Step 82: the RLC layer carries out comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain complete RLC PDUs, acquires the PDCP PDUs from the complete RLC PDUs, and sends the PDCP PDUs to the PDCP layers of the UE side, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC layer;

specifically, when the RLC PDU segments are received, the RLC PDU segments are sorted according to the SN of the segments, and a complete RLC PDU is formed according to the segmentation information.

When transmitting the PDCP PDUs to the PDCP layer, the PDCP PDUs can be transmitted even if the PDCP PDUs are received out-of-order.

Step 83: and the PDCP layer processes the received PDCP PDU to obtain a PDCP SDU and delivers the PDCP SDU to a high layer of the UE side.

Specifically, the PDCP layer decrypts, depeads and reorders the received PDCP PDU, and delivers the PDCP SDU to the upper layer after decoding the in-sequence data packet.

In the embodiment of the invention, each RLC layer corresponds to a plurality of MAC layers, and the RLC layers can comprehensively process data from a plurality of paths, such as receiving sequencing, recombining and state feedback, thereby improving the network efficiency.

Preferably, the step of the RLC layer performing comprehensive processing on the received RLC PDU or RLC PDU segments includes: the RLC layer sequences the received RLC PDUs or RLC PDU segments sent by different MAC layers, judges whether packet loss exists according to a sequencing result, and sends a packet loss state report to an RLC-H layer of a network side when the packet loss exists.

The one-to-one correspondence between the RLC layer of the UE side and the RLC-H layer of the network side corresponds to the same logical channel, and handles the related functions of ARQ (automatic repeat request).

After the UE side receives the retransmission packet sent by the network side, an Acknowledgement (ACK) may be returned as needed, and a successful feedback and retransmission process is completed.

In the embodiment of the invention, the RLC layer generates feedback and a packet loss state report together by combining the receiving conditions on a plurality of links, thereby improving the network efficiency.

EXAMPLE III

Referring to fig. 9, a third embodiment of the present invention provides a data transmission method, where the data transmission method is applied to downlink retransmission on a network side, and the data transmission method includes:

step 91: when receiving a packet loss state report fed back by an RLC layer of a UE side, the RLC-H layer determines an RLC PDU needing retransmission or an RLC PDU segment specified in the packet loss state report; acquiring RLC PDU or RLC PDU segments needing retransmission and sending the RLC PDU segments to an RLC-L layer;

and step 92: the RLC-L layer sends the received RLC PDU needing retransmission or the RLC PDU segment to an MAC layer;

step 93: and the MAC layer processes the received RLC PDU needing to be retransmitted or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the UE side.

In the embodiment of the invention, when RLC PDU segments need to be retransmitted, only the designated RLC PDU segments can be transmitted, and the RLC-H layer forms the corresponding RLC PDU segments according to the segment information of the retransmission packet designated in the packet loss state.

In the embodiment of the present invention, preferably, the RLC PDU or RLC PDU segment to be retransmitted and/or the interface information of the RLC-H layer and the RLC-L layer includes a flag indicating that the current RLC PDU or RLC PDU segment is a retransmission packet.

For example, in the header of the RLC PDU, there is a 1-bit field, and the 1-bit field can be represented by setting 0 as initial transmission and setting 1 as retransmission, or vice versa. Alternatively, the label of the retransmission packet may be carried in the interface information of the RLC-H layer and the RLC-L layer, for example, the label is carried in the header display of GTP-U, or may be 1bit, one value represents the initial transmission packet, and the other value represents the retransmission packet.

Since the retransmission packet generally has a higher priority and can be sent with the initial transmission packet first, in this embodiment of the present invention, when each RLC-H layer corresponds to multiple RLC-L layers, preferably, in step 91, the step of acquiring, by the RLC-H layer, the RLC PDU or the RLC PDU segment that needs to be retransmitted, and sending the RLC PDU or the RLC PDU segment to the RLC-L layer includes: the RLC-H layer selects one link with the link condition better than that of other links from at least two links and sends the RLC PDU to the RLC-L layer corresponding to the selected link. That is, during retransmission, according to the real-time situation of the current multiple links, the path with the best link condition is selected for transmission, and the path selection of initial transmission is not considered.

When the retransmission packet reaches the RLC-L layer, it can be transmitted preferentially due to its higher priority. That is, in the step 92, the step of sending, by the RLC-L layer, the received RLC PDU requiring retransmission or RLC PDU segment to the corresponding MAC layer on the network side includes: and when the RLC-L layer receives the RLC PDU or the RLC PDU segment which needs to be retransmitted, the RLC PDU or the RLC PDU segment which needs to be retransmitted is preferentially sent to the MAC layer. And the RLC-L layer identifies the retransmission packet according to the mark of the retransmission packet.

In the embodiment of the invention, when one RLC-H layer corresponds to a plurality of RLC-L layers, the RLC-H layer can comprehensively process the transmission conditions on a plurality of links, effectively carry out retransmission, can improve the user experience and is also beneficial to improving the network efficiency.

1) the data transmission method can be applied to a radio transmission network of a CU-DU architecture, and at the moment, the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and the MAC layer are positioned in a DU;

3) the data transmission method can be applied to a radio transmission network with an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.

Example four

Referring to fig. 10, a fourth embodiment of the present invention provides a data transmission method, where the data transmission method is applied to uplink initial transmission on a UE side, and the data transmission method includes:

step 101: the PDCP layer of the UE side processes the received high-level data packet to obtain PDCP PDUs, and sends the PDCP PDUs to the RLC layer of the UE side, wherein each PDCP layer corresponds to at least one RLC layer;

step 102: the RLC layer processes the received PDCP PDU to obtain RLC PDU or RLC PDU segments and sends the RLC PDU or RLC PDU segments to an MAC layer of the UE side, wherein each RLC layer corresponds to at least two MAC layers;

specifically, the RLC layer completes the processing of the RLC PDU, and may send the corresponding RLC PDU or RLC PDU segments to the MAC layer for sending in advance or after the MAC layer obtains the transmission resources.

Step 103: and the MAC layer processes the received RLC PDU or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the network side.

In the embodiment of the invention, each RLC layer corresponds to at least two MAC layers, namely at least two links, so that the RLC layer can select a path with a better link to send data according to the real-time condition of the current link, thereby improving the network efficiency.

That is, the step of the RLC layer sending the RLC PDU or RLC PDU segments to the MAC layer of the UE side may include: and the RLC layer selects at least one link with better link condition than other links from at least two links and sends the RLC PDU or the RLC PDU segments to the MAC layer corresponding to the selected link.

EXAMPLE five

Referring to fig. 11, a fifth embodiment of the present invention provides a data transmission method, where the data transmission method is applied to uplink reception on a network side, and the data transmission method includes:

step 111: the MAC layer of the network side processes the received MAC PDU to obtain RLC PDUs or RLC PDU segments and sends the RLC PDUs or the RLC PDU segments to corresponding RLC-L layers, wherein each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer corresponds to one MAC layer;

specifically, the MAC layer may obtain a logical channel ID in the RLC PDU or the RLC PDU segment, and determine the RLC-L layer to which the RLC PDU or the RLC PDU segment belongs according to the logical channel ID in the RLC PDU or the RLC PDU segment.

Step 112: the RLC-L layer transmits the received RLC PDU or RLC PDU segments to corresponding RLC-H layers, wherein each RLC-H layer corresponds to at least one RLC-L layer;

step 113: the RLC-H layer processes the received RLC PDU or the RLC PDU segments to obtain a complete RLC PDU, acquires a PDCP PDU from the complete RLC PDU and sends the PDCP PDU to a PDCP layer on the network side, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;

step 114: and the PDCP layer processes the received PDCP PDU to obtain a PDCP SDU and delivers the PDCP SDU to a high layer of the network side.

In the embodiment of the present invention, preferably, each RLC-H layer corresponds to at least two RLC-L layers, and the step of the RLC-H layer processing the received RLC PDU or RLC PDU segments to obtain a complete RLC PDU includes: and the RLC-H layer carries out comprehensive processing on the received RLC PDUs or the RLC PDU segments sent by different RLC-L layers to obtain the complete RLC PDU.

Preferably, the step of the RLC-H layer performing comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different RLC-L layers includes: the RLC-H layer sequences the received RLC PDUs or RLC PDU segments sent by different RLC-L layers, judges whether packet loss exists according to a sequencing result, and sends a packet loss state report to the RLC layer of the UE side when the packet loss exists.

That is, the RLC-H layer processes the receiving states of different paths uniformly to form feedback, and sends a packet loss state report to the RLC layer of the UE side, thereby improving network efficiency.

Specifically, the packet loss status report may include only the NACK status, or may also include the ACK status.

The data transmission method of the embodiment of the invention can be applied to various types of wireless transmission networks, for example:

2) the data transmission method can be applied to a radio transmission network of an NR dual-connection or multi-connection architecture, and at this time, the PDCP layer and the RLC-H layer are located in an MeNB; or

3) The data transmission method can be applied to a radio transmission network with an NR-LTE interworking architecture, and at the moment, the PDCP layer and the RLC-H layer are located in an NR MeNB.

EXAMPLE six

Referring to fig. 12, a sixth embodiment of the present invention provides a data transmission method, where the data transmission method is applied to uplink retransmission on a UE side, and the data transmission method includes:

step 121: when an RLC layer of a UE side receives a packet loss state report fed back by an RLC-H layer of a network side, determining an RLC PDU (protocol data Unit) or an RLC PDU segment which is specified in the packet loss state report and needs to be retransmitted; acquiring RLC PDU or RLC PDU segments needing to be retransmitted and sending the RLC PDU segments to an MAC layer;

step 122: and the MAC layer processes the received RLC PDU or RLC PDU segment which needs to be retransmitted to obtain the MAC PDU and sends the MAC PDU to a network side.

Because each RLC layer corresponds to a plurality of MAC layers, the RLC layers can comprehensively process packet loss states on a plurality of paths, and therefore network efficiency is improved.

Preferably, the step of the RLC layer acquiring the RLC PDU or RLC PDU segment to be retransmitted and sending the RLC PDU or RLC PDU segment to the MAC layer includes: and the RLC layer acquires the link of the latest uplink resource and sends the RLC PDU needing to be retransmitted or the RLC PDU to the MAC layer corresponding to the link of the latest uplink resource in a segmented manner so as to ensure retransmission delay.

Uplink transmission needs to be scheduled and has a certain delay, for example, it is reached that the uplink resource is used after t, which is generally 4 subframes, i.e. t + 4. If one of the two paths has acquired uplink resources and is available after 4 subframes, and the other path has no resources, the first path has the nearest uplink resources. If the uplink resource of the first path can be used after 2 subframes and the uplink resource of the second path can be used after 3 subframes on two paths (which means that the two paths have waited for different durations after receiving the uplink resource), it is obvious that the first path has the nearest uplink resource.

Of course, in some other embodiments of the present invention, a path with higher reliability may be selected, for example, a path with lower average block error rate or better link quality may be selected, and the RLC PDU or RLC PDU segment that needs to be retransmitted is transmitted.

EXAMPLE seven

Referring to fig. 13, fig. 13 is a schematic structural diagram of a radio transmission network with a CU-DU architecture according to a seventh embodiment of the present invention, and as can be seen from fig. 13, at the network side, a PDCP layer and an RLC-H layer are located in a CU, and an RLC-L layer and an MAC layer are located in a DU. On the UE side, one PDCP layer corresponds to one RLC layer, and one RLC layer corresponds to 2 MAC layers (MAC-1 and MAC-2).

The following describes in detail the processes of downlink initial transmission, downlink initial transmission reception and feedback, downlink retransmission, uplink initial transmission reception and feedback, and uplink retransmission of the CU-DU architecture wireless transmission network in fig. 13.

(1) Uplink initial transmission

The method mainly comprises the following steps:

step 1311: the PDCP layer of the CU entity processes the received high-level Data packet to obtain a PDCP PDU (Protocol Data Unit) and sends the PDCP PDU to the RLC-H layer;

specifically, the PDCP layer may use the above buffering mechanism, when receiving a higher layer data packet, store the obtained PDCP SDU in the buffer, and perform PDCP layer processing on only a small number of PDCP SDUs in the buffer at a time to obtain a PDCP PDU and send the PDCP PDU to the RLC-H layer, or directly perform PDCP layer processing on a higher layer data packet and send the PDCP PDU to the RLC-H layer when receiving the higher layer data packet.

In the embodiment of the invention, the RLC layers and the PDCP layers are in one-to-one correspondence and belong to the same logical channel, each logical channel only corresponds to one RLC layer in a CU, and the RLC layer is positioned at the upper end of a protocol stack and can be called as an RLC-High (RLC-H) layer;

step 1312: the RLC-H layer processes the received PDCP PDU to obtain the RLC PDU and sends the RLC PDU to an RLC-L layer of a DU entity through leg 1;

specifically, the RLC-H may also use the above buffering mechanism, when receiving the PDCP PDU, store the obtained RLC SDU in the buffer, and perform RLC layer processing on only a small number of RLC SDUs in the buffer at a time, so as to obtain the RLC PDU and send the RLC PDU to the RLC-L layer of the DU entity.

Step 1313: the RLC-L layer of the DU entity stores the received RLC PDU in a buffer memory; and when the transmission opportunity of the MAC layer is reached, the RLC-L layer processes the cached RLC PDU to obtain the RLC PDU or segments of the RLC PDU and sends the RLC PDU to the MAC layer.

Step 1314: and the MAC layer processes the received RLC PDU or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the UE side.

(2) Downlink initial transmission reception and feedback

Step 1321: the MAC layer of the UE side processes the received MAC PDU to obtain an RLC PDU or an RLC PDU segment and sends the RLC PDU segment to a corresponding RLC layer;

step 1322: and the RLC layer sorts the received RLC PDUs or the received RLC PDU segments according to the sequence numbers of the RLC PDUs or the RLC PDU segments to obtain complete RLC PDUs, acquires the PDCP PDUs from the complete RLC PDUs, and sends the PDCP PDUs to the PDCP layer of the UE side. In the sequencing process, whether RLC PDU or RLC PDU segmentation with missing sequence number exists is judged; when the RLC PDU with the missing sequence number or the RLC PDU segment exists, starting a reordering timer; and when the reordering timer is overtime and the RLC PDU or the RLC PDU segment with the missing sequence number is not received, judging that packet loss exists. And when packet loss exists, sending a packet loss state report to an RLC-H layer of the network side.

Step 1323: and the PDCP layer processes the received PDCP PDU to obtain a PDCP SDU and delivers the PDCP SDU to a high layer of the UE side.

(3) Downlink retransmission

Step 1331: when an RLC-H layer of a CU entity at a network side receives a packet loss state report fed back by an RLC layer at a UE side, determining RLC PDUs (radio link control protocol data units) needing retransmission or RLC PDU segments specified in the packet loss state report; acquiring RLC PDU (protocol data unit) or RLC PDU segments needing to be retransmitted, selecting a link (leg2) with a link condition superior to that of other links from two links, and sending the RLC PDU to an RLC-L layer corresponding to the selected link;

step 1332: and when the RLC-L layer receives the RLC PDU or the RLC PDU segment which needs to be retransmitted, the RLC PDU or the RLC PDU segment which needs to be retransmitted is preferentially sent to the MAC layer.

Step 1333: and the MAC layer processes the received RLC PDU needing to be retransmitted or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the UE side.

(4) Uplink initial transmission

Step 1341: the PDCP layer of the UE side processes the received high-level data packet to obtain a PDCP PDU and sends the PDCP PDU to the RLC layer of the UE side;

step 1342: the RLC layer processes the received PDCP PDU to obtain the RLC PDU or the RLC PDU segment and sends the RLC PDU or the RLC PDU segment to an MAC layer of the UE side;

step 1343: and the MAC layer processes the received RLC PDU or the RLC PDU segments to obtain the MAC PDU and sends the MAC PDU to the network side.

(5) Uplink reception and feedback

Step 1351: the MAC layer of the network side processes the received MAC PDU to obtain an RLC PDU or an RLC PDU segment and sends the RLC PDU segment to a corresponding RLC-L layer;

step 1352: the RLC-L layer transmits the received RLC PDU or the RLC PDU segments to the corresponding RLC-H layer;

step 1353: the RLC-H layer of the CU entity comprehensively processes the RLC PDUs or the RLC PDU segments sent by different RLC-L layers to obtain complete RLC PDUs, obtains the PDCP PDUs from the complete RLC PDUs, and sends the PDCP PDUs to the PDCP layer of the network side; and in the sequencing process, judging whether packet loss exists according to the sequencing result, and sending a packet loss state report to an RLC layer of the UE side when the packet loss exists.

Step 1354: and the PDCP layer processes the received PDCP PDU to obtain a PDCP SDU and delivers the PDCP SDU to a high layer of the network side.

(6) Uplink retransmission

Step 1361: when an RLC layer of a UE side receives a packet loss state report fed back by an RLC-H layer of a network side, determining an RLC PDU (protocol data Unit) or an RLC PDU segment which is specified in the packet loss state report and needs to be retransmitted; and acquiring the RLC PDU or the RLC PDU segment which needs to be retransmitted, acquiring the link of the latest uplink resource, and sending the RLC PDU or the RLC PDU segment which needs to be retransmitted to the MAC layer corresponding to the link of the latest uplink resource.

Step 1362: and the MAC layer processes the received RLC PDU or RLC PDU segment which needs to be retransmitted to obtain the MAC PDU and sends the MAC PDU to a network side.

Example eight

Referring to fig. 14, fig. 14 is a schematic structural diagram of a radio transmission network with NR dual-connectivity or multi-connectivity architecture according to an eighth embodiment of the present invention, as can be seen from fig. 14, on a network side, a PDCP layer and an RLC-H layer are located in an MeNB, the MeNB further includes an RLC-L layer and a MAC layer, and a SeMB also includes an RLC-L layer and a MAC layer, where one PDCP layer corresponds to one RLC-H layer, one RLC-H layer corresponds to two RLC-L layers, that is, one RLC-H layer corresponds to two legs, and each RLC-L layer corresponds to one MAC layer. On the UE side, one PDCP layer corresponds to one RLC layer, and one RLC layer corresponds to 2 MAC layers (MAC-1 and MAC-2).

In the embodiments of the present invention, only an example of dual connectivity is given, and if two or more senbs exist, it is considered as multi-connectivity.

In the framework of the embodiment of the present invention, for the network side, the dual-connection or multi-connection routing node is RLC-H.

The data processing in the embodiment of the present invention is similar to the data processing procedure in the foregoing embodiment, and the biggest difference is that the PDCP and RLC-H on the network side are located inside one of the transmission paths MeNB, the PDCP is most clear and convenient for the status of the MeNB, and other procedures are similar and will not be described in detail here.

Example nine

Please refer to fig. 15, fig. 15 is a structural diagram of a radio transmission network with NR-LTE interworking architecture according to a ninth embodiment of the present invention, and as can be seen from fig. 15, in the embodiment of the present invention, on a network side, a PDCP layer and an RLC-H layer are located in an MeNB, the MeNB further includes an RLC-L layer and an MAC layer, and an LTE SeMB also includes an RLC-L layer and an MAC layer, where one PDCP layer corresponds to one RLC-H layer, one RLC-H layer corresponds to two RLC-L layers, that is, one RLC-H layer corresponds to two legs, and each RLC-L layer corresponds to one MAC layer. On the UE side, one PDCP layer corresponds to one RLC layer, and one RLC layer corresponds to 2 MAC layers (MAC-1 and MAC-2).

Under the condition that the 5G system and the 4G system work cooperatively, as shown in fig. 15, the left side is an NR protocol stack, the right side is an LTE protocol stack, and it is explicitly written in fig. 15 that the LTE protocol stack is provided, the existing LTE protocol process is adopted, and an NR new protocol stack is required for other protocol stacks.

Of course, fig. 15 only shows an example, there may be two or more LTE links, that is, a new LTE SeNB is added, and the structure is similarly added, and similarly, on the NR side, a new SeNB, that is, a new NR SeNB may also be added to form a multi-connection.

In the interworking case, it is particularly necessary for the LTE link to maintain the existing processing. For the network side, the LTE link can completely treat the received data packet as RLC SDU without distinguishing the specific data format, which can be ensured by the existing LTE protocol, even the LTE link can be configured in UM mode without acknowledging and retransmitting data, and all feedback and retransmission are performed by 5G RLC-H.

As shown in fig. 15, the UE side RLC sequences and reassembles RLC data from multiple paths, and feeds back the found packet loss to the network side RLC-H layer, where the RLC-H layer arranges retransmission of corresponding data, and the retransmission can also select the fastest path, which can pass through the LTE path. The LTE path does not distinguish the type of the data packet, and performs processing completely according to the receiving sequence, which may not achieve high priority processing on the retransmission packet, and of course, if the retransmission packet carries the identifier of the retransmission packet, the LET path may also perform high priority processing. For the NR path, priority handling of retransmitted data is supported.

Example ten

Referring to fig. 16, fig. 16 is a schematic structural diagram of a network-side device according to a tenth embodiment of the present invention, where the network-side device includes:

the PDCP layer is used for processing the received high-level data packet to obtain a PDCP PDU and sending the PDCP PDU to the RLC-H layers, wherein each PDCP layer corresponds to at least one RLC-H layer;

the RLC-H layer is used for processing the received PDCP PDU to obtain the RLC PDU and sending the RLC PDU to at least one RLC-L layer, wherein each RLC-H layer corresponds to at least one RLC-L layer;

the RLC-L layers are used for processing the received RLC PDUs to obtain the RLC PDUs or RLC PDU segments and sending the RLC PDUs or the RLC PDU segments to the MAC layers, wherein each RLC-L layer corresponds to one MAC layer, and each MAC layer corresponds to at least one RLC-L layer;

Preferably, each RLC-H layer corresponds to at least two RLC-L layers.

Preferably, the RLC-H layer includes:

Preferably, the PDCP layer includes:

the first cache module is used for processing the received high-level data packet to obtain PDCP SDU and storing the PDCP SDU in a cache;

a first preprocessing module, configured to obtain a first number of PDCP SDUs from the buffer, and process the first number of PDCP SDUs, where the first number of PDCP SDUs includes allocating SNs to the first number of PDCP SDUs to obtain PDCP PDUs;

a first sending module, configured to send a PDCP PDU to an RLC-H layer;

Preferably, the first number is determined in the following manner:

a first number N1 × GBR, where N1 is a positive integer; or

A first number N1 × PBR, wherein N1 is a positive integer; or

Preferably, the RLC-H layer includes:

the second sending module is used for sending the RLC PDU to the RLC-L layer;

Preferably, the third number is determined in the following manner:

a third number of N2 × GBR, where N2 is a positive integer; or

A third number of N2 × PBR, where N2 is a positive integer; or

Preferably, the RLC-L layer includes:

the buffer module is used for storing the received RLC PDU in a buffer;

Preferably, each RLC-H layer corresponds to at least two RLC-L layers,

Preferably, the network side device is applied to a radio transmission network of a CU-DU architecture, and the PDCP layer and the RLC-H layer are located in a CU; the RLC-L layer and the MAC layer are positioned in a DU; or

The network side equipment is applied to a radio transmission network of an NR dual-connection or multi-connection architecture, and the PDCP layer and the RLC-H layer are positioned in an MeNB; or

The network side equipment is applied to a radio transmission network with an NR-LTE interworking architecture, and the PDCP layer and the RLC-H layer are located in an NR MeNB.

EXAMPLE eleven

Referring to fig. 17, fig. 17 is a schematic structural diagram of a user equipment according to an eleventh embodiment of the present invention, where the user equipment includes:

the MAC layer is used for processing the received MAC PDU to obtain RLC PDUs or RLC PDU segments and sending the RLC PDUs or the RLC PDU segments to the corresponding RLC layers, wherein each RLC layer corresponds to a plurality of MAC layers;

the RLC layer is used for comprehensively processing the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain complete RLC PDUs, obtaining PDCP PDUs from the complete RLC PDUs, and sending the PDCP PDUs to the PDCP layers, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC layer;

and the PDCP layer is used for processing the received PDCP PDU to obtain a PDCP SDU and delivering the PDCP SDU to a high layer.

Preferably, the RLC layer is further configured to sequence the received RLC PDUs or RLC PDU segments sent by different MAC layers, determine whether packet loss exists according to a sequencing result, and send a packet loss status report to the RLC-H layer of the network side when packet loss exists.

Example twelve

The user equipment of the embodiment of the invention comprises:

the PDCP layer is used for processing the received high-level data packet to obtain PDCP PDUs and sending the PDCP PDUs to the RLC layers, wherein each PDCP layer corresponds to at least one RLC layer;

the RLC layer is used for processing the received PDCP PDU to obtain the RLC PDU or RLC PDU segments and sending the RLC PDU or the RLC PDU segments to the MAC layer, wherein each RLC layer corresponds to at least two MAC layers;

Preferably, the RLC layer is further configured to determine, when a packet loss status report fed back by the RLC-H layer on the network side is received, an RLC PDU or an RLC PDU segment that needs to be retransmitted and is specified in the packet loss status report; acquiring RLC PDU or RLC PDU segments needing to be retransmitted and sending the RLC PDU segments to an MAC layer;

EXAMPLE thirteen

The network side equipment of the embodiment of the invention comprises:

the MAC layer is used for processing the received MAC PDU to obtain RLC PDUs or RLC PDU segments and sending the RLC PDUs or the RLC PDU segments to the corresponding RLC-L layers, wherein each MAC layer corresponds to at least one RLC-L layer, and each RLC-L layer corresponds to one MAC layer;

the RLC-L layers are used for transmitting the received RLC PDUs or the RLC PDU segments to the corresponding RLC-H layers, wherein each RLC-H layer corresponds to at least one RLC-L layer;

the RLC-H layer is used for processing the received RLC PDU or the RLC PDU segments to obtain a complete RLC PDU, obtaining a PDCP PDU from the complete RLC PDU and sending the PDCP PDU to the PDCP layer of the network side, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC-H layer;

Preferably, each RLC-H layer corresponds to at least two RLC-L layers,

The working principle of the device according to the invention can be referred to the description of the method embodiment described above.

Example fourteen

An embodiment fourteen of the present invention provides a data processing apparatus, including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store programs and data used by the processor in performing operations, and when the processor calls and executes the programs and data stored in the memory, the memory including functional modules or units implementing:

Example fifteen

An embodiment fifteenth of the present invention provides a data processing apparatus, including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store programs and data used by the processor in performing operations, and when the processor calls and executes the programs and data stored in the memory, the memory including functional modules or units implementing:

Example sixteen

An embodiment sixteenth of the present invention provides a data processing apparatus, including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store programs and data used by the processor in performing operations, and when the processor calls and executes the programs and data stored in the memory, the memory including functional modules or units implementing:

Example seventeen

A seventeenth embodiment of the present invention provides a data processing apparatus including: a processor; and a memory connected to the processor through a bus interface, the memory being used to store programs and data used by the processor in performing operations, and when the processor calls and executes the programs and data stored in the memory, the memory including functional modules or units implementing:

It should be noted that the apparatuses provided in the fourteenth, fifteenth, sixteenth and seventeenth embodiments of the present invention are apparatuses capable of implementing the data transmission method provided in the foregoing method embodiments, so that all the embodiments of the data transmission method provided in the foregoing method embodiments can be applied to the fourteenth, fifteenth, sixteenth and seventeenth embodiments, and can achieve the same or similar beneficial effects.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A data transmission method is applied to a network side, and is characterized by comprising the following steps:

the packet data convergence protocol PDCP layer processes the received high-level data packet to obtain a PDCP protocol data unit PDU and sends the PDCP protocol data unit PDU to a radio link layer control protocol high RLC-H layer, wherein each PDCP layer corresponds to at least one RLC-H layer, and the RLC-H layer is responsible for data sequential delivery and automatic retransmission request data transmission guarantee;

the RLC-H layer processes the received PDCP PDU to obtain RLC PDUs, and sends the RLC PDUs to a radio link layer control protocol-low RLC-L layer, wherein each RLC-H layer corresponds to at least one RLC-L layer, and the RLC-L layer is responsible for the segmentation and the concatenation of data;

2. The data transmission method of claim 1, wherein each RLC-H layer corresponds to at least two RLC-L layers.

3. The data transmission method of claim 2, wherein the RLC-H layer transmitting the RLC PDU to the RLC-L layer comprises:

4. The data transmission method according to claim 1, wherein the PDCP layer processes the received higher layer packet to obtain PDCP PDUs, and sends the PDCP PDUs to the RLC-H layer, comprising:

a sending step: the PDCP layer sends the PDCP PDU to the RLC-H layer;

5. The data transmission method according to claim 4, wherein the first number is determined by:

a first number N1 × guaranteed bit rate GBR, where N1 is a positive integer; or

A first number N1 × priority bit rate PBR, where N1 is a positive integer; or

6. The data transmission method according to claim 1, wherein the RLC-H layer processes the received PDCP PDU to obtain an RLC PDU, and sends the RLC PDU to the RLC-L layer comprises:

a sending step: the RLC-H layer sends the RLC PDU to an RLC-L layer;

7. The data transmission method according to claim 6, wherein the third number is determined by:

a third number N2 × guaranteed bit rate GBR, where N2 is a positive integer; or

A third number N2 × priority bit rate PBR, where N2 is a positive integer; or

The third number is N2 × M, where N2 is a positive integer and M is the actual amount of data scheduled each TTI before.

8. The data transmission method according to claim 1, wherein the RLC-L layer processes the received RLC PDU to obtain an RLC PDU or an RLC PDU segment, and sends the RLC PDU or RLC PDU segment to the MAC layer, the method comprising the steps of:

the RLC-L layer stores the received RLC PDU in a cache;

9. The data transmission method according to claim 1, further comprising:

10. The data transmission method according to claim 9, wherein the RLC PDU or RLC PDU segment needing retransmission and/or the interface information of the RLC-H layer and the RLC-L layer includes a flag indicating that the current RLC PDU or RLC PDU segment is a retransmission packet.

11. The data transmission method according to claim 10, wherein each RLC-H layer corresponds to at least two RLC-L layers, and the step of obtaining the RLC PDU or RLC PDU segment to be retransmitted and sending the RLC PDU or RLC PDU segment to the RLC-L layers comprises:

12. The data transmission method according to claim 10, wherein the step of the RLC-L layer sending the received RLC PDU or RLC PDU segment requiring retransmission to the corresponding MAC layer of the network side comprises:

13. The data transmission method according to any one of claims 1 to 12,

the data transmission method is applied to a wireless transmission network with a centralized unit CU-distributed unit DU architecture, and the PDCP layer and the RLC-H layer are positioned in a CU; the RLC-L layer and the MAC layer are positioned in a DU; or

14. A data transmission method is applied to a UE side, and is characterized by comprising the following steps:

the RLC layer carries out comprehensive processing on the received RLC PDUs or RLC PDU segments sent by different MAC layers to obtain complete RLC PDUs, obtains packet data convergence protocol PDCP PDUs from the complete RLC PDUs, and sends the PDCP PDUs to the PDCP layers, wherein each RLC layer corresponds to one PDCP layer, and each PDCP layer corresponds to at least one RLC layer;

15. The data transmission method according to claim 14, wherein the step of the RLC layer comprehensively processing the received RLC PDUs or RLC PDU segments sent by different MAC layers comprises:

the RLC layer sequences the received RLC PDUs or RLC PDU segments sent by different MAC layers, judges whether packet loss exists according to a sequencing result, and sends a packet loss state report to a radio link layer control protocol-high RLC-H layer of a network side when the packet loss exists, wherein the RLC-H layer is responsible for data sequential submission and automatic retransmission request data transmission guarantee.

16. The data transmission method according to claim 15, wherein the RLC layer sequences the received RLC PDUs or RLC PDU segments sent by different MAC layers, and the step of determining whether there is packet loss according to the sequencing result comprises:

17. A data transmission method is applied to a UE side, and is characterized by comprising the following steps:

18. The data transmission method according to claim 17, further comprising:

when the RLC layer receives a packet loss state report fed back by a radio link layer control protocol-high RLC-H layer of a network side, determining the RLC PDU needing retransmission or the RLC PDU segment specified in the packet loss state report; acquiring RLC PDU (radio link control protocol data unit) or RLC PDU segments needing to be retransmitted and sending the RLC PDU segments to an MAC (media access control) layer, wherein the RLC-H layer is responsible for data sequential delivery and automatic retransmission request data transmission guarantee;

19. The method of claim 18, wherein the step of obtaining RLC PDUs or RLC PDU segments that need to be retransmitted and sending the RLC PDUs or RLC PDU segments to the MAC layer comprises:

20. A data transmission method is applied to a network side, and is characterized by comprising the following steps:

the medium access control MAC layer processes the received MAC protocol data unit PDU to obtain a radio link layer control protocol RLC PDU or an RLC PDU segment and sends the RLC PDU segment to a corresponding radio link layer control protocol-low RLC-L layer, wherein each MAC layer corresponds to at least one RLC-L layer, each RLC-L layer corresponds to one MAC layer, and the RLC-L layer is responsible for the segmentation cascade of data;

the RLC-L layer transmits the received RLC PDU or the RLC PDU to a radio link layer control protocol-high RLC-H layer in a segmented mode, wherein each RLC-H layer corresponds to at least one RLC-L layer, and the RLC-H layer is responsible for data sequential delivery and automatic retransmission request data transmission guarantee;

21. The data transmission method according to claim 20, wherein each RLC-H layer corresponds to at least two RLC-L layers, and the step of the RLC-H layer processing the received RLC PDU or RLC PDU segments to obtain a complete RLC PDU comprises:

22. The data transmission method of claim 21, wherein the RLC-H layer processing the received RLC PDU or RLC PDU segment comprises:

23. The data transmission method according to claim 22, wherein the RLC-H layer sequences the received RLC PDUs or RLC PDU segments sent by different RLC-L layers, and the step of determining whether there is packet loss according to the sequencing result comprises:

24. The data transmission method according to any one of claims 20 to 23,

25. A network-side device, comprising:

the RLC-H layer is used for processing the received PDCP PDU to obtain a radio link layer control protocol RLC PDU and sending the RLC PDU to at least one radio link layer control protocol-low RLC-L layer, wherein each RLC-H layer corresponds to at least one RLC-L layer, and the RLC-H layer is responsible for data sequential delivery and automatic retransmission request data transmission guarantee;

the RLC-L layers are used for processing the received RLC PDUs to obtain the RLC PDUs or RLC PDU segments and sending the RLC PDUs or the RLC PDU segments to the medium access control MAC layer, wherein each RLC-L layer corresponds to one MAC layer, each MAC layer corresponds to at least one RLC-L layer, and the RLC-L layers are responsible for data segmentation and concatenation;

26. The network-side device of claim 25, wherein each RLC-H layer corresponds to at least two RLC-L layers.

27. The network-side device of claim 26, wherein the RLC-H layer comprises:

28. The network device of claim 25, wherein the PDCP layer comprises:

a first sending module, configured to send a PDCP PDU to an RLC-H layer;

29. The network-side device of claim 28, wherein the first number is determined by:

A first number N1 × priority bit rate PBR, where N1 is a positive integer; or

30. The network-side device of claim 25, wherein the RLC-H layer comprises:

the second sending module is used for sending the RLC PDU to the RLC-L layer;

31. The network-side device of claim 30, wherein the third number is determined by:

A third number N2 × priority bit rate PBR, where N2 is a positive integer; or

32. The network-side device of claim 25, wherein the RLC-L layer comprises:

the buffer module is used for storing the received RLC PDU in a buffer;

33. The network-side device of claim 25, wherein:

the RLC-H layer is also used for determining the RLC PDU or the RLC PDU segment which needs to be retransmitted and is specified in the packet loss state report when the packet loss state report fed back by the RLC layer of the UE side is received; acquiring RLC PDU or RLC PDU segments needing retransmission and sending the RLC PDU segments to an RLC-L layer;

34. The network side device of claim 33, wherein the RLC PDU or RLC PDU segment requiring retransmission and/or the interface information of the RLC-H layer and the RLC-L layer includes a flag indicating that the current RLC PDU or RLC PDU segment is a retransmission packet.

35. The network device of claim 34, wherein each RLC-H layer corresponds to at least two RLC-L layers,

36. The network-side device of claim 34, wherein:

and the RLC-L layer is also used for preferentially sending the RLC PDU or the RLC PDU segment which needs to be retransmitted to the MAC layer when receiving the RLC PDU or the RLC PDU segment which needs to be retransmitted.

37. The network-side device of any one of claims 25-36,

the network side equipment is applied to a wireless transmission network with a centralized unit CU-distributed unit DU architecture, and the PDCP layer and the RLC-H layer are positioned in a CU; the RLC-L layer and the MAC layer are positioned in a DU; or

38. A user device, comprising:

39. The user equipment of claim 38, wherein:

the RLC layer is also used for sequencing the received RLC PDUs or RLC PDU segments sent by different MAC layers, judging whether packet loss exists according to a sequencing result, and sending a packet loss state report to a high RLC-H layer which is a wireless link layer control protocol of a network side when the packet loss exists, wherein the RLC-H layer is responsible for data sequential submission and automatic retransmission request data transmission guarantee.

40. The user equipment of claim 39, wherein:

the RLC layer is also used for sequencing the received RLC PDUs or the received RLC PDU segments according to the serial numbers of the RLC PDUs or the received RLC PDU segments and judging whether the RLC PDUs or the RLC PDU segments with missing serial numbers exist or not; when the RLC PDU with the missing sequence number or the RLC PDU segment exists, starting a reordering timer; and when the reordering timer is overtime and the RLC PDU or the RLC PDU segment with the missing sequence number is not received, judging that packet loss exists.

41. A user device, comprising:

42. The user equipment of claim 41, wherein:

the RLC layer is further configured to determine an RLC PDU or an RLC PDU segment that needs to be retransmitted and is specified in the packet loss status report when receiving the packet loss status report fed back by a radio link layer control protocol-high RLC-H layer on the network side; acquiring RLC PDU (radio link control protocol data unit) or RLC PDU segments needing to be retransmitted and sending the RLC PDU segments to an MAC (media access control) layer, wherein the RLC-H layer is responsible for data sequential delivery and automatic retransmission request data transmission guarantee;

43. The user equipment of claim 42, wherein:

the RLC layer is further configured to obtain a link of a latest uplink resource, and send an RLC PDU that needs to be retransmitted or an RLC PDU segment to the MAC layer corresponding to the link of the latest uplink resource.

44. A network-side device, comprising:

the RLC-L layers are used for transmitting the received RLC PDUs or the received RLC PDUs to corresponding radio link layer control protocols, namely high RLC-H layers, wherein each RLC-H layer corresponds to at least one RLC-L layer, and the RLC-L layers are responsible for the segmentation and the concatenation of data;

the RLC-H layer is used for processing the received RLC PDU or the received RLC PDU in a segmented mode to obtain a complete RLC PDU, acquiring a packet data convergence protocol PDCP PDU from the complete RLC PDU and sending the PDCP PDU to the PDCP layer on the network side, wherein each RLC layer corresponds to one PDCP layer, each PDCP layer corresponds to at least one RLC-H layer, and the RLC-H layer is responsible for data sequential delivery and automatic retransmission request data transmission guarantee;

45. The network device of claim 44, wherein each RLC-H layer corresponds to at least two RLC-L layers,

46. The network-side device of claim 45, wherein:

the RLC-H layer is also used for sequencing the RLC PDUs or the RLC PDU segments sent by different RLC-L layers, judging whether packet loss exists according to a sequencing result, and sending a packet loss state report to the RLC layer of the UE side of the user equipment when the packet loss exists.

47. The network-side device of claim 46, wherein:

the RLC-H layer is also used for sequencing the received RLC PDU or the RLC PDU segments according to the serial number of the received RLC PDU or the RLC PDU segments and judging whether the RLC PDU or the RLC PDU segments with the missing serial number exist or not; when the RLC PDU with the missing sequence number or the RLC PDU segment exists, starting a reordering timer; and when the reordering timer is overtime and the RLC PDU or the RLC PDU segment with the missing sequence number is not received, judging that packet loss exists.

48. The network-side device of any one of claims 44-47,