CN114978411A

CN114978411A - Transmission block processing method and device and storage medium

Info

Publication number: CN114978411A
Application number: CN202110213140.7A
Authority: CN
Inventors: 冯震; 王森; 金婧; 王启星; 袁弋非
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2022-08-30

Abstract

The invention discloses a transmission block processing method, a device and a storage medium, comprising the following steps: the base station combines the data packets of a plurality of UE into one data packet for coding, and adds the position information of the UE data packet in the transmission block obtained by coding. And the UE receives the coding transmission block sent by the base station, and acquires a user data packet of the UE according to user position information carried in the transmission block after coding. By adopting the invention, the joint design of coding and multiple access can be realized; and the decoding performance is improved.

Description

Transmission block processing method and device and storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for processing a transport block, and a storage medium.

Background

In order to support the requirement of future mass connection, the NOMA (non-orthogonal multiple access) technology represented by the SCMA (Sparse code multiple access) is widely concerned, and the existing NOMA scheme is mainly designed from two aspects of a power domain and a code domain: the power domain adopts different signal amplitudes; and the code domain adopts multi-dimensional constellation modulation or low-density spread spectrum sequences. A number of studies have demonstrated that combining coding and multiple access techniques can lead to significant performance improvements.

The defects of the prior art are as follows: most of the existing schemes simply cascade coding and multiple access, so the performance gain of coding can be improved.

Disclosure of Invention

The invention provides a transmission block processing method, transmission block processing equipment and a storage medium, which are used for improving the performance of coding.

The invention provides the following technical scheme:

a transport block processing method, comprising:

the base station combines the data packets of a plurality of UE into one data packet for coding, and adds the position information of the UE data packet in the transmission block obtained by coding.

In implementation, before performing LDPC encoding after combining data packets of each UE into one data packet, the method further includes:

and adding CRC check bits to the user data packet of each UE.

In implementation, adding the location information of the UE packet to the transport block obtained by encoding includes: the starting position and length of the information bits of the UE in the transport block.

In the implementation, the data packets of each UE are combined into one data packet and then encoded, wherein the encoding mode is LDPC error correction encoding.

In the implementation, after combining the data packets of each UE into one data packet for encoding, the method further includes:

and mapping the coded bits into a symbol sequence by adopting Quadrature Amplitude Modulation (QAM) modulation and sending the symbol sequence to the UE through a downlink channel.

A transport block processing method, comprising:

and the UE receives the coding transmission block sent by the base station, and acquires a user data packet of the UE according to user position information carried in the transmission block after decoding.

In implementation, after obtaining the user data packet of the UE, the method further includes:

and performing CRC (cyclic redundancy check) on the user data packet, and extracting information bits of the user data packet after the CRC is correct.

In implementation, the user location information carried in the transport block includes: the starting position and length of the user data packet of the UE in the transport block.

In the implementation, the transmission block is decoded according to an error correction coding mode adopted by a transmitting end, and the decoding mode is LDPC decoding.

A base station, comprising:

a processor for reading the program in the memory, performing the following processes:

the base station combines the data packets of a plurality of UE into one data packet for encoding, and adds the position information of the UE data packet into the transmission block obtained by encoding;

a transceiver for receiving and transmitting data under the control of the processor.

In the implementation, before performing LDPC encoding after combining the data packets of each UE into one data packet, the method further includes:

and adding CRC check bits to the user data packet of each UE.

In the implementation, adding the location information of the UE packet to the transport block obtained by encoding includes: the starting position and length of the information bits of the UE in the transport block.

A base station, comprising:

and the base station coding module is used for combining the data packets of the plurality of UE into one data packet for coding, and adding the position information of the UE data packet into the transmission block obtained by coding.

In an implementation, the method further comprises the following steps:

and the base station CRC module is used for adding CRC check bits to the user data packets of the UE before the data packets of the UE are combined to form a data packet for LDPC coding.

In an implementation, the base station encoding module is further configured to add location information of the UE packet to the transport block obtained by encoding, and includes: the starting position and length of the information bits of the UE in the transport block.

In implementation, the base station encoding module is further configured to combine data packets of each UE into one data packet and then perform encoding, where the encoding mode is LDPC error correction encoding.

In implementation, the base station sending module is further configured to combine data packets of each UE to form one data packet for coding, and then map the coded bits into a symbol sequence by using Quadrature Amplitude Modulation (QAM) modulation and send the symbol sequence to the UE through a downlink channel.

A UE, comprising:

the UE receives a coding transmission block sent by a base station, and acquires a user data packet of the UE according to user position information carried in the transmission block after decoding;

In the implementation, the transmission block is decoded according to the error correction coding mode adopted by the transmitting end, and the decoding mode is LDPC decoding.

A UE, comprising:

and the UE decoding module is used for receiving the coding transmission block sent by the base station and acquiring the user data packet of the UE according to the user position information carried in the transmission block after decoding.

In an implementation, the method further comprises the following steps:

and the UE CRC module is used for performing CRC on the user data packet after the user data packet of the UE is acquired, and extracting the information bits of the user data packet after the CRC is correct.

In implementation, the UE decoding module is further configured to decode the transmission block according to an error correction coding method adopted by the originating terminal, where the decoding method is LDPC decoding.

A computer-readable storage medium storing a computer program for executing the above-described transport block processing method and/or transport block processing method.

The invention has the following beneficial effects:

in the technical scheme provided by the embodiment of the invention, the data packets of the UE are combined to form one data packet and then are coded, and the bits of the user are combined to be coded, so that the joint design of coding and multiple access can be realized; meanwhile, the joint coding can effectively reduce the probability of short loops by increasing the code length of the coding, thereby avoiding the local repeated accumulation of variable node self-information in the soft decision decoding process and improving the decoding performance.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:

fig. 1 is a schematic flow chart illustrating an implementation of a transmission block processing method at a base station side according to an embodiment of the present invention;

fig. 2 is a schematic flow chart illustrating an implementation of a method for processing a transport block on a UE side according to an embodiment of the present invention;

FIG. 3 is a flow chart of multi-user joint coding according to an embodiment of the present invention;

FIG. 4 is a block diagram of a multi-user joint coding transmission block according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating UBP indication information in an embodiment of the present invention;

FIG. 6 is a diagram illustrating a system based on multi-user joint coding according to an embodiment of the present invention;

FIG. 7 is a diagram illustrating a base station structure according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a UE structure according to an embodiment of the present invention.

Detailed Description

The inventor notices in the process of invention that:

an LDPC (Low Density Parity Check Code) is a forward error correction Code, and after decades of development, an LDPC decoding algorithm has been widely studied to significantly improve the performance of the LDPC Code, and has recently received extensive attention from academia and industry, and is finally adopted as a coding scheme of a data channel by 5G NR (New Radio).

In the existing multi-user downlink transmission scheme, user data is mainly subjected to operations such as channel coding, interleaving, modulation, mapping and the like. The cascading mode cannot sufficiently integrate coding and multiple access into a unified framework, and joint design of a factor graph cannot be carried out among different users.

The Tanner graph represents the check matrix of LDPC. The Tanner graph contains two types of vertices: n code word bit vertexes respectively corresponding to each column of the check matrix; and the m check equation vertexes correspond to the rows of the check matrix respectively. Because the decoding of the LDPC is carried out based on the Tanner graph generated by the check matrix, the connection relation between the check nodes and the variable nodes can form a closed ring. The short loops may cause decoding to operate locally at partial positions on the Tanner graph all the time, thereby reducing LDPC decoding performance. The loop length of the LDPC code can be increased as much as possible by a multi-user joint coding mode, so that the decoding performance is effectively improved.

Based on this, the embodiment of the present invention provides a downlink transmission scheme of multiuser joint LDPC coding, and the following describes a specific embodiment of the present invention with reference to the drawings.

In the description process, the implementation of the UE and the base station will be described separately, and then an example of the implementation of the UE and the base station will be given to better understand the implementation of the solution given in the embodiment of the present invention. Such an explanation does not mean that the two must be implemented together or separately, and actually, when the UE and the base station are implemented separately, the UE and the base station solve the problems on the UE side and the base station side, respectively, and when the two are used in combination, a better technical effect is obtained.

Fig. 1 is a schematic diagram of an implementation flow of a transmission block processing method at a base station side, as shown in the figure, the implementation flow may include:

step 101, a base station combines a plurality of UE data packets to form a data packet for encoding, and adds the position information of the UE data packet in the transmission block obtained by encoding.

Specifically, it may be:

a base station determines information bits sent to each UE;

forming the information bits of each UE into a user data packet of the UE;

combining the data packets of the UE into a data packet and then carrying out LDPC coding;

and sending the LDPC coded transmission block to each UE, wherein the coded transmission block carries the position information of the user data packet of each UE in the transmission block.

Fig. 2 is a schematic flow chart of an implementation of a method for processing a transport block at a UE side, as shown in the figure, the method may include:

step 201, the UE receives a coded transmission block sent by the base station, and after decoding, obtains a user data packet of the UE according to user location information carried in the transmission block.

Specifically, it may be:

the method comprises the steps that UE receives an LDPC coded transmission block sent by a base station, wherein the coded transmission block carries position information of user data packets of the UE in the transmission block;

performing LDPC decoding on the transmission block to obtain a data packet;

and acquiring the user data packet of the UE according to the position information of the user data packet of each UE carried in the transmission block.

and adding CRC check bits to the user data packet of each UE.

Correspondingly, after acquiring the user data packet of the UE, the UE side further includes:

Specifically, the present scheme is a downlink transmission scheme of multi-User joint LDPC coding, in which a base station performs joint LDPC coding on data packets of different users and sends UBP (User bit position) indication information. The 'joint LDPC' refers to a mode that user information bits are combined to form a large data packet and then LDPC coding is carried out.

Wherein, CRC check bits may be added to the data packets of each user terminal, and then packet coding is performed;

the UBP information sent by the base station may consist of the starting position and length of the user bits in the transport block;

the UE respectively calculates the positions of the information bits in the code blocks after decoding according to Mapping rules of the indication information, completes CRC check, extracts the bits at the corresponding positions, and does not process the bits at other positions.

Example 1:

in this example, the data packets of each UE are combined into one data packet and then encoded, and the encoding method is LDPC error correction encoding.

Specifically, LDPC encoding is performed after combining the data packets of the UEs into one data packet, and LDPC encoding is performed by using error correction encoding.

Correspondingly, at the UE side, the transmission block is decoded according to the error correction coding method adopted by the originating side, and the decoding method is LDPC decoding.

Specifically, the LDPC decoding may be performed on the transport block, and the LDPC decoding is performed by using error correction coding, but the implementation is not limited to the LDPC decoding, and other corresponding error correction decoding methods may be used as needed.

Specifically, fig. 3 is a schematic diagram of a multi-user joint coding process, and as shown in fig. 3, downlink transmission of multi-user joint coding may include four steps:

assuming that the number of users is V, firstly, forming information bits of the users into user data packets, then respectively adding CRC check bits to each user data packet, and then jointly encoding all data packets by using error correction codes to obtain check bits; finally, a UBP field is added in the header portion, specifying the location and length of each user data packet.

Fig. 4 is a schematic diagram of a multi-user joint coding transmission block structure, as shown in fig. 4, joint coding is performed by taking LDPC as an example, and a base station jointly forms bits from 4 user UEs into one large transmission block for coding. The transmitting end performs LDPC coding by using information bits composed of bits of user UE 1-user UE4, wherein each user can occupy one or more bits.

In implementation, the start position of the information bits of the UE in the transport block is represented by a Payload position field, and the length in the transport block is represented by a Payload length field.

Specifically, in order to facilitate the user to recover the own data, the base station may further send user bit position indication information. Fig. 5 is a schematic diagram of UBP indication information, and as shown in fig. 5, the user bit position indication information may be composed of two fields, namely, Payload position and Payload length, which respectively represent the start position of a user bit and the length of the user bit. Taking user v as an example, the number of bits actually occupied by the two fields can be respectively expressed as:

Payload position:L _PP ＝log ₂ (K)

Payload length:L _PL,v ＝log ₂ (K _v )，

wherein K is the information bit length of the code block generated by LDPC multi-user joint coding, K _v The length of the information bits in the data packet for user v.

Example 2:

in this example, combining the data packets of each UE into one data packet and then performing LDPC encoding, further includes:

Specifically, 4-QAM modulation may be adopted to map coded bits into a symbol sequence, and map modulation symbols onto N subcarriers through spreading for transmission, where N is the number of subcarriers in the system.

Correspondingly, on the UE side, when the UE receives the LDPC coded transport block sent by the base station, the transport block is recovered by performing multi-user detection based on a Message Passing Algorithm (MPA).

Specifically, fig. 6 is a schematic diagram of a system based on multi-user joint coding, and based on embodiment 1, fig. 6 shows a block diagram of a spread spectrum-based multi-user joint coding downlink transmission system.

Assuming that the number of users is 4, each user transmits 2 bits. At a transmitting end, after user bits are jointly encoded, 4-QAM (Quadrature Amplitude Modulation) Modulation is adopted to map the encoded bits into a symbol sequence, and Modulation symbols are mapped to different N resources (subcarriers) for transmission by spreading, where N is the number of subcarriers of the system.

At a receiving end, taking a user 1 as an example, firstly, completing multi-user detection based on an MPA (Message passing algorithm) to recover a symbol sequence; and after the demodulation is finished, the output bits are sent to an LDPC decoder. And extracting the bit of the corresponding position according to the UBP indication, and then judging whether the data is normally received or not through CRC check.

Each terminal at the receiving end can receive all data sent by the base station, so as to prevent information leakage caused by the acquisition of data of other users. After LDPC decoding, UE identifies bit position according to the indication of UBP information and extracts.

Based on the same inventive concept, the embodiment of the present invention further provides a base station, a user equipment, and a computer-readable storage medium, and because the principles of these devices for solving the problems are similar to the transmission block processing method, the implementation of these devices may refer to the implementation of the method, and repeated details are not repeated.

When the technical scheme provided by the embodiment of the invention is implemented, the implementation can be carried out as follows.

Fig. 7 is a schematic structural diagram of a base station, as shown in the figure, the base station includes:

the processor 700, which is used to read the program in the memory 720, executes the following processes:

the base station combines the data packets of a plurality of UE into one data packet for encoding, and adds the position information of the UE data packet in the transmission block obtained by encoding;

a transceiver 710 for receiving and transmitting data under the control of the processor 700.

and adding CRC check bits to the user data packet of each UE.

Where in fig. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

The embodiment of the invention also provides a base station, which comprises:

In an implementation, the method further comprises the following steps:

and the base station CRC module is used for adding CRC check bits to the user data packets of the UE before LDPC coding is carried out after the data packets of the UE are combined into one data packet.

In an implementation, the base station encoding module is further configured to add location information of the UE data packet to the transport block obtained by encoding, and includes: the starting position and length of the information bits of the UE in the transport block.

For convenience of description, each part of the above-described apparatus is separately described as being functionally divided into various modules or units. Of course, the functionality of the various modules or units may be implemented in the same one or more pieces of software or hardware in practicing the invention.

Fig. 8 is a schematic structural diagram of a UE, and as shown in the figure, the UE includes:

the processor 800, which is used to read the program in the memory 820, executes the following processes:

a transceiver 810 for receiving and transmitting data under the control of the processor 800.

Where in fig. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 810 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The user interface 830 may also be an interface capable of interfacing with a desired device for different user devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, etc.

The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.

The embodiment of the invention also provides a UE, which comprises:

In an implementation, the method further comprises the following steps:

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program for executing the foregoing base station side transport block processing method and/or UE side transport block processing method is stored in the computer-readable storage medium.

In specific implementation, reference may be made to implementation of a transport block processing method at a base station side and/or a transport block processing method at a UE side.

In summary, in the technical solution provided in the embodiment of the present invention, the base station combines the data packets after the user CRC check together to perform LDPC coding.

The base station adds user bit position indication information in the packet header to explain the starting position and the length of the user bit in the data packet.

And the terminal extracts the bits of the position from the decoded bits for subsequent processing according to the instruction of the bit position indication of the user.

The scheme provides a downlink transmission scheme of multi-user joint coding aiming at the problem of joint design of multiple access and coding, and the joint design of coding and multiple access can be realized by performing LDPC coding on the bit joints of users; meanwhile, the probability of short loops is effectively reduced, and the LDPC decoding performance is improved.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A transport block processing method applied to a network device, the method comprising:

the base station combines data packets of a plurality of User Equipment (UE) into one data packet for coding, and adds the position information of the UE data packet in a transmission block obtained by coding.

2. The transport block processing method of claim 1, wherein before combining the data packets of each UE into one data packet, further comprising:

and adding Cyclic Redundancy Check (CRC) check bits to the data packet of each UE.

3. The transport block processing method of claim 1, wherein adding location information of the UE packet to the transport block obtained by encoding comprises: the starting position and length of the information bits of the UE in the transport block.

4. The transport block processing method of claim 1, wherein the data packets of the UEs are combined into one data packet and then encoded, and the encoding is LDPC error correction encoding.

5. The transport block processing method of claim 1, wherein combining the data packets of each UE into one data packet for encoding, further comprises:

6. A transport block processing method is applied to a terminal, and the method comprises the following steps:

and the UE receives the coding transmission block sent by the base station, and acquires a user data packet of the UE according to user position information carried in the transmission block after coding.

7. The method of claim 6, wherein after obtaining the user data packet of the UE, the method further comprises:

8. The transport block processing method of claim 6, wherein the user location information carried in the transport block comprises: the starting position and length of the user data packet of the UE in the transport block.

9. The method of claim 6, wherein the transport block is decoded according to an error correction coding scheme employed by the originating terminal, the decoding scheme being LDPC decoding.

10. A base station, comprising:

combining data packets of a plurality of UE into one data packet for encoding, and adding position information of the UE data packet into a transmission block obtained by encoding;

11. A base station, comprising:

12. A UE, comprising:

receiving a coding transmission block sent by a base station, and acquiring a user data packet of the UE according to user position information carried in the transmission block after decoding;

13. A UE, comprising:

14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 9.