WO2018028712A1

WO2018028712A1 - Method and device for data processing

Info

Publication number: WO2018028712A1
Application number: PCT/CN2017/097387
Authority: WO
Inventors: 何青春; 杜忠达; 李楠; 张丽; 黄河
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-08-12
Filing date: 2017-08-14
Publication date: 2018-02-15
Also published as: CN108307437A

Abstract

A method and a device for data processing. The method comprises: after receiving information concerning an unsuccessful data transmission, a first user plane entity retransmitting to a second user plane entity the data packet that has not been successfully transmitted, the first user plane entity comprising a first transmission terminal configured to transmit data, and having a retransmission function for retransmitting the data and a dynamic routing function for determining a transmission path for the data (101); the second user plane entity performing at least one of segmentation or concatenation on a protocol data unit (PDU) data packet of the first user plane entity, and transmitting same to a third user plane entity (102); and the third user plane entity processing the PDU data packet of the second user plane entity and then transmitting same(103).

Description

Method and device for data processing

Technical field

The present application relates to, but is not limited to, the technical field of wireless communication systems, and more particularly to a method and apparatus for data processing.

Background technique

With the rapid development of wireless mobile communication, various services emerge in an endless stream. In order to meet the requirements of QoS (Quality of Service) and user experience, 5G (Fifth Generation Mobile Communication System)-NR (New Radio) User plane refactoring of the new wireless technology is an important research aspect. Moreover, if the 5G air interface rate is increased to tens of Gbps, the preamble interface between the BBU (BaseBand Unit) and the RRU (Radio Remote Unit) in the 4G (4th generation mobile communication system) is CPRI (Common Public). The traffic demand of the Radio Interface (General Public Radio Interface) will rise to the Tbps level, which puts tremendous pressure on network deployment costs and deployment difficulty.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

Embodiments of the present invention provide a data processing method and apparatus to reduce processing delay of a protocol entity.

An embodiment of the present invention provides a data processing method, including

After receiving the information that the data transmission fails, the first user plane entity resends the data packet that failed to be sent to the second user plane entity, where the first user plane entity includes the first sending end that is set to send data. The function provided by the first sending end includes: a retransmission function for retransmitting the data, and a dynamic routing function for determining a transmission path of the data;

The second user plane entity instructs the first user according to an authorization indication of the third user plane entity Transmitting, by the polygon entity, the protocol data unit PDU data packet to the third user plane entity after performing at least one of segmentation and concatenation processing;

The third user plane entity processes and processes the PDU data packet of the second user plane entity.

Optionally, the first user plane entity further includes a first receiving end configured to receive data, and the first receiving end has a function including: a serial number maintenance function, and at least one of an acknowledge mode and an unacknowledged mode. Data transmission for reordering and deduplication functions, automatic retransmission request error correction for data transmission in acknowledgment mode and protocol error detection for data transmission in acknowledgment mode, based on data routing and weighting in bearer separation multiple connections Sorting function.

Optionally, the second user plane entity includes a second sending end configured to send data and a second receiving end configured to receive data, where the second sending end has a function comprising: facing the first user plane The function of at least one of segmentation and concatenation of the data packet of the entity; the function of the second receiving end includes: reassembling the segmented data packet of the received PDU of the first user plane entity, The segmented data packet of the PDU of the first user plane entity performs a function of reordering and repeatedly detecting.

Optionally, the second user plane entity does not perform segment retransmission on the PDU of the first user plane entity.

Optionally, the second user plane entity does not support the function of re-segmenting the PDU of the second user plane entity.

Optionally, the sequence number of the data packet generated by the second user plane entity is a sequence number of the data packet generated by the first user plane entity and a sequence number of the data packet generated by the first user plane entity Move at least one item.

Optionally, the function of the second user plane entity further includes: receiving, by using a specified interface, a data packet of a long term evolution system protocol stack, or processing the received data packet, and sending the data packet to the long term evolution system protocol through a designated interface. Stack.

Optionally, the data packet format transmitted between the first user plane entity and the second user plane entity is a PDCP PDU.

Optionally, the data packet transmitted between the second user plane entity and the third user plane entity The format is RLCPDU.

An embodiment of the present invention further provides an apparatus for data processing, including: a first user plane entity, a second user plane entity, and a third user plane entity,

The first user plane entity is configured to: after receiving the information that the data transmission fails, resend the data packet that failed to be sent to the second user plane entity, where the first user plane entity includes a data set to be sent. a transmitting end, the function provided by the first sending end includes: a retransmission function for retransmitting the data, and a dynamic routing function for determining a transmission path of the data;

And the second user plane entity is configured to send, according to the authorization indication of the third user plane entity, at least one of the protocol data unit PDU data packet of the first user plane entity, and then send the information to the Third user plane entity;

The third user plane entity is configured to process the PDU data packet of the second user plane entity and send the PDU data packet.

Optionally, the second user plane entity does not perform segment retransmission on the PDU of the first user plane entity;

The second user plane entity does not support the function of re-segmenting the PDU of the second user plane entity.

Optionally, the sequence number of the data packet generated by the second user plane entity is the first user plane At least one of a sequence number of a data packet generated by the entity and an offset of a sequence number of the data packet generated by the first user plane entity.

Optionally, the data packet format transmitted between the first user plane entity and the second user plane entity is a PDCP PDU;

The data packet format transmitted between the second user plane entity and the third user plane entity is an RLC PDU.

In summary, the embodiments of the present invention provide a data processing method and apparatus, which can reduce the processing delay of a protocol entity by using the function reconstruction of the 5G-NR user plane protocol, and does not change the existing LTE protocol architecture. Under the dual connectivity DC architecture of 5G-NR and LTE, the complexity and cost of the entire system can be reduced.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of an apparatus for data processing according to an embodiment of the present invention;

2 is a schematic diagram of user plane function reconstruction according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a reconstructed NR user plane architecture according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a process of processing a terminal-side uplink sending protocol according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a cascading of RLC SDUs according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a fragmentation of an RLC SDU according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a process of processing a downlink receiving protocol on a terminal side according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of reorganization of an RLC SDU according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a process of processing a network side uplink receiving protocol according to an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of re-segmentation of an RLC PDU according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a processing procedure of a network side downlink sending protocol according to an embodiment of the present disclosure;

FIG. 12 is a flowchart of a method for data processing according to an embodiment of the present invention.

Embodiments of the invention

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. 5G needs to redefine the functions of the BBU and the RRU. For example, the functional part of the user plane of layer 2 is placed in the BBU and the part is placed in the RRU. In this embodiment, the BBU and the RRU after the re-planning function are respectively named CU (Centralized Unit) and DU (Distributed Unit).

The purpose of user plane function reconfiguration is to divide the user's face-to-face functions and deploy different user plane functions to the CU and DU respectively. One of the methods for deploying user plane functions in DUs and CUs is to perform functions with low latency requirements, including data header compression, cryptographic integrity protection, retransmission, sender serial number maintenance and receiver ordering, and ARQ (for high-level service data). Automatic Repeat Request, automatic retransmission request, etc. are placed on the CU side; functions that require high latency, fast access to air interface resources, and air interface quality, including data segmentation, concatenation, and re-segmentation Functions such as re-segment, reassembly, multi-logical channel multiplexing, and HARQ (Hybrid Automatic Repeat Request) are placed on the DU side to make the data transmission of CU and DU closer to the air interface. Meet the service QoS and meet the transmission characteristics between CU and DU.

Based on the above analysis, in order to meet the service type diversity in 5G-NR, the QoS and delay level requirements of each service, and also to meet the practical needs of at least one of dual connectivity and CU/DU separation, 5G- The protocol stack entity of the NR is redesigned to provide the best experience for the user. The embodiment of the invention provides a user plane architecture and a data processing method based on the user plane architecture. The method is implemented in the user plane architecture of the 5G-NR, and is also dual-connected in the heterogeneous network. The application is described.

An embodiment of the present invention provides a device for data processing, which re-divides and defines a function of a user plane entity, and defines a user plane entity as a first user plane entity, a second user plane entity, and a third user plane entity, which will be heavy The 5G-NR user plane architecture and the user plane architecture of eLTE (enhancement Long Term Evolution)/LTE form a dual-connection data transmission mode with separate bearers. Each entity implements different functions to work together without changing existing LTE (Long Term In the case of the protocol architecture of Evolution, the Long Term Evolution (LTE) system, the dual connectivity (DC) architecture of 5G-NR and LTE can be implemented, thereby reducing the complexity and cost of the entire system.

As shown in FIG. 1 , an apparatus for data processing according to this embodiment includes a 5G-NR user plane protocol stack entity, including: a first user plane entity 11, a second user plane entity 12, and a third user plane entity 13 .

The first user plane entity 11 is configured to, after receiving the information that the data transmission fails, resend the data packet that failed to be sent to the second user plane entity 12, where the first user plane entity 11 includes the data set as data. The first sending end of the sending, the function of the first sending end includes: a retransmission function for retransmitting the data, and a dynamic routing function for determining a transmission path of the data;

The second user plane entity 12 is configured to perform at least one of segmentation and concatenation of the protocol data unit PDU data packet of the first user plane entity 11 according to the authorization indication of the third user plane entity 13 Sended to the third user plane entity 13;

The third user plane entity 13 is configured to process the PDU data packet of the second user plane entity 12 and send it.

The first user plane entity 11 further includes a first receiving end configured to receive data, and the first receiving end has a function including: a serial number (SN) maintenance function, at least one of an acknowledge mode and a non-acknowledge mode The item data transmission performs reordering function and deduplication function, and performs automatic error retransmission request (ARQ) error correction function for data transmission in the acknowledge mode and protocol error detection function for data transmission in the acknowledge mode, based on the bearer separation multi-connection Data routing and reordering capabilities.

In this embodiment, the description of the initial transmission of the data packet is not included in the data packet sent back to the second user plane entity 12.

The second user plane entity 12 includes a second sending end configured to transmit data and a second receiving end configured to receive data, and the second sending end has a function of: performing the first user plane entity The data packet of 11 performs the function of at least one of segmentation and cascading; the function of the second receiving end includes: reassembling the received segmented data packet, and PDU to the first user plane entity 11 The segmented data packet performs the functions of reordering and repeated detection, and the reconstruction operation of the second user plane entity 12.

The second user plane entity 12 does not perform segment retransmission on the PDU of the first user plane entity 11;

The second user plane entity 12 does not support the function of re-segmenting the PDU of the second user plane entity 12; the second user plane entity 12 does not support the PDU generated by the first user plane entity 11. The segmentation packet is retransmitted.

The sequence number of the data packet generated by the second user plane entity 12 is the sequence number of the data packet generated by the first user plane entity 11 and the sequence number of the data packet generated by the first user plane entity 11 At least one of the offsets.

The data packet format transmitted between the first user plane entity 11 and the second user plane entity 12 is a packet data convergence protocol PDCP PDU.

The functions of the third user plane entity 13 include: scheduling, resource allocation, logical channel prioritization (LCP), logical channel multiplexing and demultiplexing, HARQ, and random access.

In the network side, the third user plane entity 13 has a scheduling function: configured to perform scheduling authorization processing on the protocol data unit PDU data packet of the second user plane entity 12.

The function of the third user plane entity 13 includes a Buffer Status Report (BSR), a Scheduling Request (SR), and a Power Headroom Report (PHR).

The multiplexing is a function of a transmitting end of the third user plane entity 13, and the demultiplexing is a receiving end function of the third user plane entity 13.

A possible L2 protocol stack reconfiguration design in the 5G era, combining the functions of the "non-high processing time requirement" in the RLC (Radio Link Control) layer and the functions of the PDCP layer into a protocol sublayer implementation. For the "high processing time requirement" function in the RLC layer, depending on the requirements, it may be considered to merge the functions of the MAC layer into a protocol sublayer implementation, or continue to reserve a separate protocol sublayer to implement these functions.

In the downlink dual connectivity mode with LTE as anchor (algorithm node), nine alternative architectures are given. The 3D dual connectivity architecture that implements bearer separation with the master-slave radio link control RLC is not studied in the current technical research. 3C and 1A architecture invested so much, and, as discussed earlier In the 3D dual-connection architecture, only the technical research and implementation scheme of downlink bearer separation is given, and the implementation architecture of the uplink direction is not involved. With the emphasis on the user-side function reconfiguration of 5G-NR in many enterprises and institutions, the heterogeneous network based on LTE as the anchor after user plane reconstruction can easily realize the function similar to the 3D dual-connection architecture.

FIG. 2 is a schematic diagram of user plane function reconstruction according to an embodiment of the present invention. In Figure 2, considering the LTE/WIFI (Wireless Fidelity) aggregation, the PDCP (Packet Data Convergence Protocol) layer of the actual network side eLTE/LTE can be retransmitted according to polling. PDCP PDU (Protocol Data Unit) packet, except that the algorithm needs to be further improved. Therefore, the retransmission function of the PDCP and the retransmission function of the RLC (Radio Link Control) are greatly duplicated. In many cases, the two are not required to participate at the same time. Data transmission efficiency is low. Moreover, in the 5G network research, many enterprises and institutions have also proposed technical research on user plane CU/DU partitioning. The direct result is to divide the user plane protocol stack into two levels, which will be time-insensitive user plane functions. The high-level, time-insensitive user plane functionality is placed in a centralized processing unit (CU), placing time-sensitive user plane functions at a lower level, and placing time-sensitive user plane functions in a distributed processing unit (DU) )in.

Based on the above problems and analysis, the RLC entity is functionally divided into two parts: RLC-H and RLC-L. The RLC-H and the PDCP function overlap the functions, and have the reordering function and ARQ function of the complete PDU packet. For at least one item, the corresponding entity is referred to as a first user plane entity; the RLC-L has at least one of segmentation, concatenation, reordering of PDCP PDU segments (RLC PDUs), and reassembly functions, corresponding entities It is called a second user plane entity; the third user plane entity has functions of scheduling, resource allocation, logical channel priority processing, logical channel multiplexing and demultiplexing, HARQ, random access, and the like.

FIG. 3 is a schematic diagram of a reconstructed user plane architecture according to an embodiment of the present invention. The user plane protocol architecture shown in FIG. 3 is either a 5G-NR-based user plane protocol architecture on the network side or a 5G-NR-based user plane protocol architecture on the terminal side, including a first user plane entity and a second user plane. Entity and third user plane entity.

The second user plane entity and the third user plane entity on the right side of FIG. 3 represent support for dual connectivity heterogeneous networks. The RLC entity is divided into two parts, RLC-H and RLC-L, where RLC-H and PDCP are located. Merged into a new entity with PDCP enhancement, called the first user plane entity, the first user plane entity function includes serial number (SN) maintenance of the first user plane entity, timing based packet discarding, control plane and user Face data transmission, ARQ error correction (only for AM data transmission).

Similarly, RLC-L is defined as a second user plane entity having segmentation, cascading, reordering of PDU segments of the first user plane entity, and at least one function in reassembly. The user plane entity performs segmentation and cascading on the PDU of the first user plane entity (the SDU (Service Data Unit) of the second user plane entity), and assembles according to the scheduling instruction of the third user plane entity. The PDU of the second user plane entity of the size is sent to the third user plane entity.

It should be noted that the type of the data packet transmitted between the first user plane entity and the second user plane entity is a PDCP PDU, and in the downlink, the second user plane entity according to the scheduling indication of the first user plane entity is from the first user. The PDCP PDU data packet of the polygon entity is processed by segmentation, cascading, etc., and the PDU of the appropriate second user plane entity is sent to the lower layer. In the uplink, the second user plane entity performs repeated detection on the received PDU of the second user plane entity, reorders the PDU, reassembles the operation, and finally delivers the data to the upper layer (such as the first user plane entity) in the format of the PDCP PDU.

RRC* is a high-level signaling control to implement configuration of low-level user plane entities and mobility management of terminals.

The third user plane entity functions include: scheduling, resource allocation, logical channel priority processing, logical channel multiplexing and demultiplexing, HARQ (Hybrid Automatic Repeat Request), random access, and the like.

Optionally, the functions of the user plane entity include:

The first user plane entity corresponds to the PDCP user plane entity of the eLTE/LTE, and the first user plane entity is enhanced by the function of the PDCP user plane entity, and includes ARQ correction in addition to the PDCP user plane function. Error mechanism (only for acknowledgment mode (AM) data transmission), de-cancellation and reordering for non-acknowledgment mode (UM), protocol error detection (data transmission for acknowledgment mode (AM) only).

The ARQ error correction mechanism is only used for confirming mode data transmission, corresponding to the RLC AM transmission mode of the second user plane entity.

The protocol error detection is only used for the data transmission of the acknowledge mode, corresponding to the RLC AM transmission mode of the second user plane entity.

The data packet received by the first user plane entity is a complete PDCP PDU.

The data packet format submitted by the first user plane entity to the second user plane entity is a PDCP PDU.

The reordering function of the first user plane entity includes not only reordering of data packets in the acknowledge mode, but also reordering of data packets in the non-acknowledged mode.

The repetition elimination function of the first user plane entity includes not only the repetition elimination of the data packet of the acknowledge mode, but also the repetition elimination of the data packet of the non-acknowledgment mode.

The function of the first user plane entity further includes carrying separate data routing and reordering functions. The dynamic routing of data is performed at the transmitting end, and the received data from different branches are reordered at the receiving end.

The second user plane entity corresponds to the RLC user plane entity of the eLTE/LTE, and the second user plane entity is compared with the RLC user plane entity of the eLTE/LTE, and the function includes the cascading of the RLC SDU. At least one of the segments, the discarding, reassembly of the RLC SDU, the reconstruction of the second user plane entity, reordering, and repeated detection.

Relative to the RLC entity of the LTE, the function of the second user plane entity is adjusted, and the retransmission function is moved up to the first user plane entity, that is, the retransmission function is not supported (including retransmission without supporting the fragmented data packet, Supports retransmission of complete data packets (retransmission of complete data packets is carried out on the first user plane entity for retransmission)), and re-segmentation is not supported. These are mainly considered to have higher delay requirements, for example, the segment/cascade is placed close to the third user plane entity, and the ARQ retransmission function with less delay requirement is placed in the first user plane entity, in accordance with CU/ The separation strategy of the DU to meet the transmission delay requirements of the non-ideal fronthaul case between CU/DU.

The second user plane entity does not have retransmission of PDCP PDU segments, and does not have a re-segmentation function to reduce transmission and processing delay. The PDCP PDU is from the first user plane entity.

The second user plane entity does not have its own serial number SN, and the second user plane entity is based on the sequence number SN in the data packet of the first user plane entity.

The reordering and repeat detection refers to the second user plane entity to PDCP segmentation (RLC PDU) At least one of reordering and repeat detection.

The cascading is that the second user plane entity cascading a plurality of PDCP PDU data packets from the first user plane entity according to the PDU size of the scheduling indication of the third user plane entity, as shown in FIG. 5 It is shown that the applicable object of the concatenation is data transmission of at least one mode in UM and AM.

The segment is that the second user plane entity segments a PDCP PDU packet from the first user plane entity according to a PDU size of the scheduling indication of the third user plane entity, as shown in FIG. The specific implementation is to add a suffix (such as n.1, n.2) after the serial number n of the original PDCP PDU. The applicable object of the segmentation is data transmission of at least one mode in UM and AM.

The recombination means that the second user plane entity reassembles the received data packet of the segment, and reassembles the complete PDCP PDU data packet and delivers the data to the first user plane entity, and the reorganization diagram is as shown in FIG. 8 Show. The applicable object of the reorganization is data transmission of at least one of UM and AM.

The reestablishing means that the second user plane entity performs the reconstruction of the second user plane entity after receiving the reestablishment indication of the RRC* entity.

The re-segmentation refers to the PDU size indicated by the second user plane entity according to the third user plane entity, and the second user plane entity PDU to the second user plane entity when retransmitting (eg, The re-segmentation by the RLC PDU), as shown in FIG. 10, the second user plane entity does not support the re-segmentation operation.

The third user plane entity function corresponds to the MAC user plane entity of the eLTE/LTE, and the functions include scheduling, resource allocation, logical channel priority processing LCP, logical channel multiplexing and demultiplexing, HARQ, random access, and the like.

FIG. 4 is a schematic diagram of a process of processing a terminal-side uplink sending protocol according to an embodiment of the present invention.

The data packet is offloaded in the RLC entity of the eLTE/LTE, and one branch is sent to the second user plane entity of the 5G-NR user plane through the internal interface, and one branch is the protocol entity of the 5G-NR user plane. The advantage of this architecture is that the interface between RLC-H and RLC-L is the internal interface of the terminal, no standardization is required, and only functional division is required.

Since the function definition of the second user plane entity is the content of the 5G-NR user plane research, eLTE/LTE can easily determine the function of the RLC-H according to the function of the second user plane entity in the 5G-NR. Another advantage of this architecture is that the user plane protocol stack of eLTE/LTE is the most likely The reuse of RLC is separated into RLC-H and RLC-L schemes, but the use of RLC-H and RLC-L is just an example here, such as only one RLC entity, which is divided only by function. The detailed implementation process and description of each 5G-NR user plane entity is as follows:

The sending process of the uplink data on the terminal side, as shown in FIG. 12, includes the following steps:

Step 101: After receiving the information that the data transmission fails, the first user plane entity resends the data packet that failed to be sent to the second user plane entity.

The first user plane entity includes a sending end configured to send data, and the sending end has the following functions: a retransmission function for retransmitting the data, and a dynamic routing function for determining a transmission path of the data. .

The sending end further has at least one of the following functions: at least one of a buffering protocol data unit PDU and a service data unit SDU, and a transmission buffer function for processing at least one of the cached PDU and the SDU, the dynamic a routing function, a header compression function for compressing a unit header of at least one of the PDU and the SDU, and an encryption function for encrypting at least one of the PDU and the SDU.

The sending function of the sending end may further include: serial number SN maintenance of the data packet generated by the first user plane entity (PDCP PDU sequence number maintenance), timing-based packet discarding, data transmission of the control plane and the user plane, and ARQ error correction. (only for AM data transmission), data routing and flow control based on bearer separation, data routing based on bearer separation, data flow control based on bearer separation.

The data packet format transmitted between the first user plane entity of the 5G-NR and the second user plane entity of the 5G-NR is a PDCP PDU.

The at least one of the data separation and the flow control based on the bearer separation, in the case of the 5G-NR independent deployment, the first user plane entity of the 5G-NR routes the data to at least the other network node and the second user plane entity One, and, according to the feedback information of other network nodes, flow control.

Step 102: After at least one of segmentation and concatenation of the protocol data unit PDU data packet of the first user plane entity according to the authorization indication of the third user plane entity, send the data to the third user plane entity.

The second user plane entity of the 5G-NR has at least one of segmentation and concatenation (for UM and AM data transmission only), complete PDCP PDU for the first user plane entity from 5G-NR At least one of segmentation and cascading is performed to flexibly adapt to the packet size indicated by the third user plane entity.

Considering the reliability gain brought by the enhancement of MAC HARQ, and the retransmission efficiency and the delay requirement of future mobile communication, the second user plane entity of the 5G-NR does not have the PDCP PDU segment retransmission function.

The cascading refers to the SDU of the second user plane entity according to the scheduling indication of the lower layer (such as the third user plane entity) by the second user plane entity of the 5G-NR (such as the PDCP from the first user plane entity) PDUs are cascaded into one larger packet, as shown in Figure 5.

The segmentation refers to the SDU of the second user plane entity (such as the PDCP PDU from the first user plane entity) according to the scheduling indication of the lower layer (such as the third user plane entity) by the second user plane entity of the 5G-NR. It is divided into several segments to accommodate the packet size indicated by the third user plane entity, as shown in FIG. 6.

The internal interface is implemented based on the terminal itself, and the data content transmitted on the interface is in the form of a PDCP PDU.

Optionally, the information carried on the internal interface further includes at least one of configuration information of the second user plane entity and the third user plane entity from the eLTE/LTE configuration 5G-NR, and feedback information used for flow control. And the status of the peer feedback includes (such as ARQ ACK/NACK status information).

At least one of the second user plane entity and the third user plane entity performs establishment, reconstruction, resource coordination, and the like according to the configuration information.

The flow control feedback information refers to that the second user plane entity feeds back the data transmission status to the user plane entity (such as RLC) of the eLTE/LTE, and is used for flow control of the user plane entity (such as RLC) of the eLTE/LTE. .

The status of the peer-to-peer feedback refers to the status report fed back by the second user plane entity to the peer end (the peer end is the network) to the eLTE/LTE user plane entity (such as RLC), so that eLTE / LTE user plane entity is to do retransmission or initial transmission.

Step 103: The third user plane entity processes and processes the PDU data packet of the second user plane entity.

The process of sending a data packet by the third user plane entity is similar to that of LTE, and is multiplexed and cached. Buffer Status Report (BSR), Scheduling Request (SR), power headroom reporting, etc.

The above is an example of the transmission of uplink data on the terminal side. If the network side performs uplink data transmission, the processing functions of the first user plane entity and the second user plane entity are the same as those on the terminal side, except that step 103 is performed. The third user plane entity on the network side has a scheduling function: performing scheduling authorization processing on the protocol data unit PDU data packet of the second user plane entity.

The above are all independent user plane processing of 5G-NR. Next, briefly describe the transmission mode/application scenario of the dual connection supported by the terminal.

The architecture shown on the right side of Figure 4 is the dual-connection transmission mode supported by the terminal. The data is offloaded in the RLC-H of eLTE/LTE, the second user plane entity of one branch to 5G-NR, and one branch passes its own protocol. Processing.

The data packet format transmitted between the RLC-H of the eLTE/LTE and the second user plane entity of the 5G-NR is a PDCP PDU.

The functions of the second user plane entity and the data processing process, for example, the operations of segmentation, cascading, etc. are similar to the above, and are not described herein.

The RLC-H of the eLTE/LTE is either an independent entity or merged with the PDCP into a new entity with PDCP function enhancement (for example, PDCP+), or a different functional division of the RLC.

The PDCP+RLC-H of the eLTE/LTE is similar to the first user plane entity function of the 5G-NR, and has at least one of an ARQ function and a reordering function of a complete PDCP PDU packet.

FIG. 7 shows a terminal side downlink data receiving protocol processing procedure.

In FIG. 7, when the data passes through the second user plane entity of the NR, one branch goes to the first user plane entity, and one branch is routed to the user plane entity of the eLTE/LTE through the internal interface.

This embodiment mainly describes the processing process of the third user plane entity, the second user plane entity, and the first user plane entity through the 5G-NR, and the second user plane entity of the 5G-NR to the RLC-H of the eLTE/LTE The protocol processing of the unit is not described in detail. The protocol processing procedure of the terminal side downlink data reception shown in FIG. 7 is the reverse process of the uplink data transmission protocol processing shown in FIG. 4, and includes the following steps:

Step 201: The third user plane entity of the 5G-NR sends the received data packet to the second user plane entity.

The process of receiving the data packet by the third user plane entity is similar to that of LTE, performing demultiplexing, HARQ feedback, and the like.

Step 202: After the at least one of the received data packet is reordered, repeatedly detected, and reassembled, the second user plane entity sends the generated data packet to the first user plane entity.

The reordering function of the second user plane entity is reordering of the received PDCP PDU segments by the second user plane entity.

The repeated detection function of the second user plane entity is that the second user plane entity repeatedly detects the received PDCP PDU segment.

The recombination function of the second user plane entity is that the second user plane entity reassembles the received PDCP PDU segment, recomposes the complete PDCP PDU, and then delivers the PDCP PDU to the first user plane entity.

Step 203: The first user plane entity performs corresponding processing on the received data packet.

The receiving end function of the first user plane entity may include: repeated elimination (including at least one of AM and UM modes), reordering (including at least one of AM and UM modes), ARQ error correction (AM data only) For transmission, reordering based on bearer separated packets.

The reordering function of the first user plane entity includes reordering of at least one of the reordering of the unacknowledged mode (UM mode) data packet and the acknowledgement mode (AM mode).

The repetition elimination function of the first user plane entity includes not only the repetition elimination of the data packet in the acknowledge mode (AM mode) but also the repetition elimination of the data packet in the non-acknowledgment mode (UM mode).

The function of the first user plane entity further includes carrying a separate packet reordering function. At the receiving end, the received data from different branches is reordered. In the case of 5G-NR independent deployment, the first user plane entity of the 5G-NR reorders the data received from the other network nodes and the data received by the second user plane entity.

The format of the data packet generated by the first user plane entity is a data packet of a PDCP PDU type.

The recombination refers to the segmentation of multiple PDCP PDUs received by the second user plane entity (eg, N.1 and n.2) are reorganized, and the complete PDCP PDU data packet (such as the serial number n) is resubmitted to the first user plane entity, as shown in FIG. 8, and the recombination applicable object is UM. And data transmission of at least one of the AM.

Optionally, the receiving end of the first user plane entity has at least one of the following functions: receiving a buffering function for receiving and buffering at least one of the received protocol data unit PDU and the service data unit SDU, and receiving the a rearrangement function of reordering at least one of a PDU and the SDU, a decompression function of decompressing a unit header of at least one of the received PDU and the SDU, and the received PDU and At least one of the SDUs performs a decryption function of decryption.

The architecture shown on the right side of Figure 7 is a transmission mode in which the terminal supports dual connectivity. One branch routes the 5G-NR second user plane entity to the eLTE/LTE RLC-H, and one branch arrives through the eLTE/LTE own protocol processing procedure. RLC-H.

The RLC-H of the eLTE/LTE is either an independent entity or merged with the PDCP into a new entity with PDCP function enhancement (defined as PDCP+), or a different functional partitioning of the RLC.

The data packet format of the RLC-H unit delivered by the second user plane entity of the 5G-NR to the eLTE/LTE is in the form of a PDCP PDU and is a complete PDCP PDU data packet.

The PDCP+RLC-H of the eLTE/LTE is similar to the first user plane entity function of the 5G-NR, and has reordering and ARQ error correction functions of a complete data packet.

FIG. 9 shows a process for processing a user plane data processing method applied to a network side uplink receiving protocol. The processing shown in FIG. 9 is similar to the processing shown in FIG. 7, except that on the right side of FIG. 9, a branch is transmitted to the third user plane entity and the second user plane entity of the 5G-NR through the Xnew interface. The RLC user plane entity of eLTE/LTE; one branch passes the protocol processing process of eLTE/LTE itself (MAC->RLC->PDCP).

The Xnew interface in this embodiment is a newly defined interface, which is different from the existing X2 interface.

Figure 11 shows the network side downlink transmission protocol processing procedure, which is the inverse of the process shown in Figure 9. The user plane entity function of the 5G-NR shown in FIG. 11 is similar to that described in the process shown in FIG. The architecture on the right side of Figure 11 is similar to the dual-connected 3D architecture in LTE. The dual-connected DC architecture of 5G-NR and LTE can be implemented without changing the protocol architecture of the existing LTE, thereby reducing the overall system. Complexity and cost.

The embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when the computer executable instructions are executed.

Those of ordinary skill in the art will appreciate that all or some of the steps, systems, and functional blocks/units of the methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical units; for example, one physical component may have multiple functions, or one function or step may be composed of several physical The components work together. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer readable medium, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules, or other data. , removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridge, magnetic tape, magnetic disk storage or other magnetic storage device, or may Any other medium used to store the desired information and that can be accessed by the computer. Moreover, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media.

The above is only an alternative embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

Through the function reconstruction of the 5G-NR user plane protocol, the processing delay of the protocol entity can be reduced, and the dual-connected DC architecture of 5G-NR and LTE can be realized without changing the existing LTE protocol architecture, thereby reducing The complexity and cost of the entire system.

Claims

A method of data processing, including

After receiving the information that the data transmission fails, the first user plane entity resends the data packet that failed to be sent to the second user plane entity, where the first user plane entity includes the first sending end that is set to send data. The function provided by the first sending end includes: a retransmission function for retransmitting the data, and a dynamic routing function for determining a transmission path of the data (101);

Transmitting, by the second user plane entity, the protocol data unit PDU data packet of the first user plane entity by at least one of segmentation and concatenation according to an authorization indication of the third user plane entity, and sending the third user plane entity to the third User plane entity (102);

The third user plane entity processes the PDU data packet of the second user plane entity and sends it (103).
The method of claim 1 wherein

The first user plane entity further includes a first receiving end configured to receive data, and the first receiving end has a function comprising: a serial number maintenance function, performing data transmission on at least one of an acknowledge mode and a non-acknowledge mode The reordering function and the repetitive canceling function, the automatic retransmission request error correction function for confirming the data transmission of the mode and the protocol error detection function for the data transmission of the acknowledge mode, based on the data routing and reordering function in the bearer separation multi-connection.
The method of claim 1 wherein

The second user plane entity includes a second sending end configured to transmit data and a second receiving end configured to receive data, and the second sending end has a function comprising: a data packet to the first user plane entity Performing a function of at least one of segmentation and cascading; the function of the second receiving end includes: reassembling the segmented data packet of the received PDU of the first user plane entity, and performing the first The segmentation packet of the PDU of the user plane entity performs the functions of reordering and repeated detection.
The method of claim 3, wherein

The second user plane entity does not perform segment retransmission on the PDU of the first user plane entity.
The method of claim 3, wherein

The second user plane entity does not support re-segmentation of the PDU of the second user plane entity The function.
The method of claim 3, wherein

The sequence number of the data packet generated by the second user plane entity is at least one of a sequence number of a data packet generated by the first user plane entity and a sequence number of a data packet generated by the first user plane entity. item.
The method of claim 3, wherein

The second user plane entity further has the following functions: receiving the data packet of the long term evolution system protocol stack through the designated interface, or processing the received data packet and sending the data packet to the long term evolution system protocol stack through the designated interface.
A method according to any of claims 2-7, wherein

The data packet format transmitted between the first user plane entity and the second user plane entity is a packet data convergence protocol PDCP PDU.
A method according to any of claims 2-7, wherein

The data packet format transmitted between the second user plane entity and the third user plane entity is a radio link control RLC PDU.
An apparatus for data processing, comprising: a first user plane entity (11), a second user plane entity (12), and a third user plane entity (13),

The first user plane entity (11) is configured to, after receiving the information that the data transmission fails, resend the data packet that failed to be sent to the second user plane entity (12), where the first user plane entity ( 11) The first sending end is configured to be configured to send data, and the functions of the first sending end include: a retransmission function for retransmitting the data, and a dynamic routing function for determining a transmission path of the data;

The second user plane entity (12) is configured to segment and cascade the protocol data unit PDU data packet of the first user plane entity (11) according to an authorization indication of the third user plane entity (13) After at least one item, sent to the third user plane entity (13);

The third user plane entity (13) is configured to process the PDU data packet of the second user plane entity (12) and send it.
The device of claim 10, wherein

The first user plane entity (11) further includes a first receiving end configured to receive data, and the first receiving end has a function including: a serial number maintenance function, and at least one of an acknowledge mode and a non-acknowledgment mode. Data transmission for reordering and deduplication, automatic retransmission request error correction for data transmission in acknowledgment mode and protocol error detection for data transmission in acknowledgment mode, based on data routing and reordering in bearer separation multiple connections Features.
The device of claim 10, wherein

The second user plane entity (12) includes a second sending end configured to transmit data and a second receiving end configured to receive data, and the second sending end has a function comprising: performing the first user plane entity The data packet of (11) performs the function of at least one of segmentation and concatenation; the function of the second receiving end includes: segmentation data of the received PDU of the first user plane entity (11) The packet performs reassembly, and performs the functions of reordering and repeatedly detecting the segmented data packets of the PDU of the first user plane entity (11).
The device of claim 12, wherein

The second user plane entity (12) does not perform segment retransmission on the PDU of the first user plane entity;

The second user plane entity (12) does not support the function of re-segmenting the PDU of the second user plane entity (12).
The device of claim 12, wherein

The sequence number of the data packet generated by the second user plane entity (12) is the sequence number of the data packet generated by the first user plane entity (11) and the data packet generated by the first user plane entity (11). At least one of the offsets of the serial number.
The device of claim 12, wherein

The second user plane entity (12) further has a function of: receiving a data packet of the long term evolution system protocol stack through the designated interface, or processing the received data packet and sending the data packet to the long term evolution system protocol stack through the designated interface. .
A device according to any of claims 10-15, wherein

Number transmitted between the first user plane entity (11) and the second user plane entity (12) According to the packet format, the packet data convergence protocol PDCP PDU;

The data packet format transmitted between the second user plane entity (12) and the third user plane entity (13) is a radio link control RLC PDU.