CN101699780B

CN101699780B - Data transmission method, user equipment, base station and data transmission system

Info

Publication number: CN101699780B
Application number: CN 200910220858
Authority: CN
Inventors: 郑中亮; 张�杰
Original assignee: Shanghai Huawei Technologies Co Ltd
Current assignee: Shanghai Huawei Technologies Co Ltd
Priority date: 2009-10-30
Filing date: 2009-10-30
Publication date: 2012-12-19
Anticipated expiration: 2029-10-30
Also published as: CN101699780A

Abstract

The invention relates to a data transmission method, user equipment, a base station and a data transmission system, and the method comprises the following steps: determining the corresponding relationship between TB number and code word number of the user equipment; sending downlink control messages of DCI and TB to the user equipment, wherein the DCI comprises the corresponding relationship between the TB number of the TB which needs to be received by the UE and the code word number; receiving a confirmation ACK message or a negation NACK message fed back by the user equipment, wherein, the ACK or the NACK comprises cyclic redundancy check CRC results of various TB; and confirming the receiving state to the TB according to the CRC results of the various TB. The invention can reduce the TB number-code word number conversion problem in the prior art, as well as the problem that as a network side caches the corresponding relationship between the TB number of the TB which needs to be received by all UE and the code word number, a memory is occupied.

Description

Data transmission method, user equipment, base station and data transmission system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method, a user equipment, a base station, and a data transmission system.

Background

In a Long Term Evolution (LTE) system, a Hybrid Automatic Repeat Request (HARQ) technology is a key physical process in the LTE system. The HARQ includes a downlink HARQ and an uplink HARQ. The process of HARQ includes: when the receiving side successfully analyzes the received Transport Block (TB), sending a positive Acknowledgement (ACK) to the sending side; when the receiving side fails to receive the TB resolution, a Negative Acknowledgement (NACK) is transmitted to the transmitting side. If the sender receives the ACK, releasing the cached TB; if the transmitting side receives NACK, the buffered TB is retransmitted.

At present, in an existing data transmission method, a processing procedure of downlink HARQ is mainly involved, which mainly includes:

1) when receiving a TB, a Media Access Control (MAC) layer of an evolved node b (eNodeB) caches a corresponding relationship between a TB number and a codeword number of all User Equipment (UE), and sends a downlink Control message DCI and a TB to the UE in a downlink, where the DCI includes: and after receiving ACK or NACK sent by the UE, searching the corresponding TB number according to the code word number in the ACK or NACK, and further confirming the receiving state of the TB received by the UE.

2) When a Physical Layer (PHY) of the UE receives downlink, firstly, data corresponding to each codeword is obtained through Multiple Input Multiple Output (MIMO) decoding, then, data corresponding to each TB is obtained according to a corresponding relationship between a TB number and a codeword number in a DCI message, and then, HARQ combining is performed on the TBs according to the TB numbers to obtain a Cyclic Redundancy Check (CRC) result of each TB; obtaining a CRC (cyclic redundancy check) result of each code word according to the corresponding relation between the TB number and the code word number; and finally, reporting the CRC result corresponding to each code word to the UE MAC.

3) The UE media Access Control layer (MAC) constructs a feedback message, i.e. ACK or NACK, according to the CRC check result of each codeword reported by the UE phy, and sends the ACK or NACK to the eNodeB MAC through an uplink.

4) After receiving the ACK or NACK sent by the UE MAC, the eNodeB MAC searches for a corresponding TB number according to the codeword number in the ACK or NACK and the corresponding relationship between the TB numbers of all TBs that the UE needs to receive and the codeword numbers, thereby obtaining the reception condition of each TB and confirming the TB reception status.

For the implementation process, the inventor of the present invention finds that the following defects exist in the existing implementation mode: for eNodeB, eNodeB MAC needs to buffer the corresponding relationship between the TB numbers of TBs that all UEs need to receive and the code word numbers, that is, occupies a certain memory, and after receiving ACK or NACK fed back by the UE, needs to convert the code word numbers to the TB numbers, thereby increasing the conversion processing from the code word numbers to the TB numbers.

In addition, for the UE, since the UE MAC feeds back according to the CRC result of the codeword, after HARQ combining, the UE PHY also needs to obtain the CRC result of each codeword according to the corresponding relationship between the TB number and the codeword number, so that the UE MAC constructs ACK or NACK according to the codeword number, and adds the conversion processing from the TB number to the codeword number.

Disclosure of Invention

The embodiment of the invention provides a data transmission method, user equipment, a base station and a data transmission system.

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

determining the corresponding relation between the TB number of the TB required to be received by the user equipment and the code word number;

sending downlink control messages DCI and TB to user equipment, wherein the DCI comprises: UE needs to receive the corresponding relation between the TB number of the TB and the code word number;

receiving a positive Acknowledgement (ACK) or Negative Acknowledgement (NACK) message fed back by user equipment, wherein the ACK or NACK message comprises Cyclic Redundancy Check (CRC) results of all TBs;

and confirming the receiving state of the TB according to the received CRC result of each TB.

An embodiment of the present invention further provides a data transmission method, including:

receiving downlink control information DCI and a transmission block TB sent by a base station, and obtaining each TB according to the DCI; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB;

and constructing an ACK or NACK message according to the obtained CRC result of each TB, and sending the constructed ACK or NACK message to a base station.

Accordingly, an embodiment of the present invention provides a base station, including:

a determining unit, configured to determine a corresponding relationship between a TB number and a codeword number of a TB that the UE needs to receive;

a sending unit, configured to send a downlink control message DCI and a TB to the user equipment after the determining unit determines the corresponding relationship between the TB number of the user equipment and the code word number, where the DCI includes: the user equipment needs to receive the corresponding relationship between the TB number and the code word number of the TB.

An embodiment of the present invention further provides a user equipment, including:

the first processing unit is used for receiving downlink control information DCI and transmission blocks TB sent by a base station, and obtaining each TB according to the DCI; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB;

and the second processing unit is used for constructing an ACK or NACK message according to the CRC result of each TB obtained by the first processing unit and sending the constructed ACK or NACK message to a base station.

Correspondingly, the invention also provides a data transmission system, which comprises: a base station and a user equipment, wherein,

a base station, configured to determine a corresponding relationship between a TB number of a TB that needs to be received by a user equipment and a code word number, and send a downlink control message DCI and the TB to the user equipment, where the DCI includes: the user equipment needs to receive the corresponding relation between the TB number of the TB and the code word number; when receiving a positive Acknowledgement (ACK) or Negative Acknowledgement (NACK) message fed back by the user equipment, confirming the receiving state of the TB according to the CRC result of each TB in the ACK or NACK message;

the user equipment is used for receiving the DCI and the TB sent by the base station, analyzing the data of the TB to obtain data corresponding to the code word, and obtaining the TB corresponding to each TB number according to the corresponding relation between the TB number and the code word number in the DCI; carrying out HARQ merging processing on the TBs according to the TB numbers to obtain CRC results of the TBs; and constructing an ACK or NACK message according to the CRC result of each TB, and feeding back the ACK or NACK message to a base station.

As can be seen from the foregoing solution, in the embodiment of the present invention, after determining the corresponding relationship between the TB number of the TB that needs to be received by the UE and the code word number, the base station directly sends the downlink control message DCI and the TB including the corresponding relationship to the user equipment without storing the corresponding relationship, and after receiving the ACK or NACK message that is constructed based on the CRC result of each TB and fed back by the user equipment, confirms the reception state of the TB according to the received CRC result of each TB. That is to say, when receiving the ACK or NACK message including the CRC result of each TB, the base station directly confirms the reception status of the TB, thereby saving memory occupation of the base station, i.e., not buffering the correspondence between the TB numbers and the codeword numbers of the TBs that all UEs need to receive.

After receiving the DCI and the TBs, the user equipment obtains each TB according to the DCI; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB; then, constructing an ACK or NACK message according to the CRC result of each TB, and feeding back the ACK or NACK message to the base station; further, the base station confirms the reception state of the TB according to the CRC result of each TB in the received ACK or NACK message. That is to say, in the embodiment of the present invention, since the user equipment constructs the ACK or NACK message according to the reception result of the TB, that is, the content of the ACK or NACK message directly reflects the CRC check result of the TB, the problem that the user equipment needs to perform the conversion processing from the TB number to the codeword number after HARQ combining is eliminated. Furthermore, the user equipment and the base station only process the TB, and the TB is not converted into a code word any more, so that the protocol level division of the PHY layer and the MAC layer is clear.

Drawings

Fig. 1 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 2 is a flowchart of another data transmission method according to an embodiment of the present invention;

fig. 3 is a signaling flowchart of a data transmission method according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

fig. 6 is another schematic structural diagram of a user equipment according to an embodiment of the present invention;

fig. 7 is a data transmission system according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a flowchart of a data transmission method provided in an embodiment of the present invention is shown, where a base station in the embodiment of the present invention may be an evolved node b, or a conventional base station, and the present embodiment is not limited to this, and the method includes:

step 101: the base station determines the corresponding relation between the TB number of the TB required to be received by the UE and the code word number;

step 102: a base station sends downlink control messages DCI and TB to user equipment, wherein the DCI comprises: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number;

step 103: a base station receives a positive Acknowledgement (ACK) or Negative Acknowledgement (NACK) message fed back by user equipment, wherein the ACK or NACK message comprises Cyclic Redundancy Check (CRC) results of all TBs;

when a base station transmits a subframe to a user, for a user equipment, the subframe may contain one TB or two TBs of the user. In an alternative embodiment, if the subframe includes two TBs, the ACK or NACK message may include: 2 bits, bit0 and bit1, where bit0 represents the CRC result of TB0 (the 0 th of the two TBs) and bit1 represents the CRC result of TB1 (the 1 st of the two TBs).

In another alternative embodiment, if a subframe includes two TBs, the ACK or NACK message may include 2 bits, i.e., bit0 and bit1, where bit0 represents the CRC result and of TB0 (0 th TB of the two TBs) of consecutive subframes, and bit1 represents the CRC result and of TB1 (1 st TB of the two TBs) of consecutive subframes; the plurality of subframes may be: 2 subframes, 3 subframes, or 4 subframes, etc., but is not limited thereto.

In another optional embodiment, the ACK or NACK message may include: n bits, each bit sequentially represents the result of the AND of the CRC result of TB0 and the CRC result of TB1 of each of the N subframes, wherein N is greater than or equal to 3 and less than or equal to 32, but the method is not limited to the above and can be adaptively modified according to different systems. The ACK or NACK message described below may be exemplified by including 4 bits, and the other is analogized, that is, bit0, bit1, bit2, and bit3, where bit0 represents the result of the CRC result of TB0 and the CRC result of TB1 of the first subframe of consecutive 4 subframes; bit1 indicates the result of the CRC result of TB0 and the CRC result of TB1 for the second subframe of the consecutive 4 subframes; bit2 indicates the result of the CRC result of TB0 and the CRC result of TB1 for the third subframe of the consecutive 4 subframes; bit3 indicates the result of the CRC result of TB0 and the CRC result of TB1 for the fourth subframe of consecutive 4 subframes.

Step 104: and the base station confirms the receiving state of the TB according to the received CRC result of each TB.

In this embodiment, since the base station directly confirms the reception state of the TBs when receiving the ACK or NACK message of the CRC result of each TB, memory occupation of the base station is saved, that is, the base station does not need to buffer the correspondence between the TB number of the TB that the UE needs to receive and the code word number, and the process of converting the code word number to the TB number is omitted.

Referring to fig. 2, a flowchart of another data transmission method according to an embodiment of the present invention is shown, where the method includes:

step 201: the method comprises the steps that user equipment receives downlink control information DCI and transmission blocks TB sent by a base station, and each TB is obtained according to the DCI; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB; the method specifically comprises the following steps:

the method comprises the steps that user equipment receives DCI and TB sent by a base station, wherein the DCI comprises: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number;

the user equipment analyzes the received TB data to obtain data corresponding to the code words, and obtains the TB corresponding to each TB number according to the corresponding relation between the TB number in the DCI and the code word number;

and the user equipment performs hybrid automatic repeat request HARQ merging processing on the TBs according to the obtained TB numbers to obtain the CRC results of the TBs.

Step 202: and the user equipment constructs an ACK or NACK message according to the CRC result of each TB and feeds back the ACK or NACK message to the base station.

Wherein, the process of constructing the ACK or NACK message according to the CRC result of each TB includes, but is not limited to, the following:

bit0 represents the CRC result for TB0, and bit1 represents the CRC result for TB 1; or

Bit0 indicates the result of CRC result and of TB0 of consecutive subframes, bit1 indicates the result of CRC result and of TB1 of consecutive subframes; or

And sequentially representing the result of the AND of the CRC result of the TB0 and the CRC result of the TB1 of each subframe of the N subframes by using each bit of the N bits, wherein N is more than or equal to 3 and less than or equal to 32.

Taking 3 bits as an example, that is, the bit0 represents the result of the sum of the CRC result of TB0 and the CRC result of TB1 in the first subframe of consecutive 3 subframes; the result of the CRC result of TB0 and the CRC result of TB1 of the second subframe of consecutive 3 subframes is represented by bit 1; the result of the CRC result of TB0 for the third subframe of consecutive 3 subframes and the CRC result of TB1 is represented by bit 2.

In the embodiment of the invention, the user equipment constructs the ACK or NACK message according to the receiving result of the TB, namely the content of the ACK or NACK message directly reflects the CRC result of the TB, thereby saving the conversion processing from the TB number to the code word number after the HARQ combination of the user equipment.

To facilitate understanding by those skilled in the art, the following description will be made with reference to yet another embodiment.

Referring to fig. 3, a signaling flow chart of a data transmission method according to an embodiment of the present invention is shown, in which an eNB MAC, a UE PHY, and a UE MAC are taken as examples, but not limited thereto, and the method includes:

step 301: the eNB MAC sends DCI and TB to the UE PHY;

that is to say, when receiving a TB sent to the UE, the eNB MAC first determines a correspondence between a TB number of the TB that the UE needs to receive and a codeword number, and sends DCI and TB including the correspondence to the UE PHY; it should be noted that, in the embodiment of the present invention, after determining the corresponding relationship between the TB numbers of the TBs that the UE needs to receive and the code word numbers, the corresponding relationship between the TB numbers of the TBs that the UE needs to receive and the code word numbers does not need to be cached.

Step 302: the UE PHY performs MIMO decoding analysis on the received DCI and TB data to obtain data corresponding to the code words;

step 303: the UE PHY obtains data corresponding to each TB according to the corresponding relation between the TB number and the code word number in the DCI message; the obtaining process may refer to step 202 in the above embodiment, and is not described herein again.

Step 304: the UE PHY performs HARQ merging processing on the TBs according to the TB numbers to obtain CRC results of the TBs;

it should be noted that, in this embodiment, after obtaining the CRC result of each TB, it is not necessary to obtain the CRC check result of each codeword according to the corresponding relationship between the TB number and the codeword number.

Step 305: the UE PHY sends CRC results of all TBs to the UE MAC;

step 306: the UE MAC constructs ACK or NACK information according to the received CRC result of each TB; there are various ways to construct ACK or NACK messages, and the embodiment of the present invention takes three construction ways as an example, but is not limited thereto.

The first construction of an ACK or NACK message includes: 2 bits (bit), the CRC check result of TB0 is represented by bit0, and the CRC check result of TB1 is represented by bit 1.

For example, the data packet received by the UE includes two TBs, and if the UE successfully analyzes all the two TBs (i.e., TB0 and TB1), that is, the CRC check result of TB0 is 1 and the CRC check result of TB1 is 1, an ACK message is sent to the eNB MAC, where bit0 is 1 and bit1 is 1 in the ACK message. If the TB0 analysis is successful, the TB1 analysis fails, that is, the CRC result of the TB0 is 1, and the CRC result of the TB1 is 0. Then an ACK is sent to the eNB MAC with bit0 being 1 and bit1 being 0 in the ACK message. If both TB0 and TB1 failed to resolve, the CRC check result of TB0 is 0 and the CRC check result of TB1 is 0. A NACK is sent to the eNB MAC with bit0 being 0 and bit1 being 0 in the NACK message.

In this embodiment, the ACK and NACK messages are for 1 bit, and if the check result is 1, the ACK message is sent, and if the check result is 0, the NACK message is sent.

The second construction of the ACK or NACK message includes: 2 bits, wherein a result of the CRC check result of the TB0 of a plurality of consecutive subframes is represented by bit0, and a result of the CRC check result of the TB1 of a plurality of consecutive subframes is represented by bit 1. For example, the plurality of subframes is 4, but not limited thereto.

The third construction of the ACK or NACK message includes: 4 bits, a result of the checksum of the CRC check result of the TB0 of the first subframe of the consecutive 4 subframes and the CRC check result of the TB1 is represented by bit0, a result of the checksum of the CRC check result of the TB0 of the second subframe of the consecutive 4 subframes and the CRC check result of the TB1 is represented by bit1, a result of the checksum of the CRC check result of the TB0 of the third subframe of the consecutive 4 subframes and the CRC check result of the TB1 is represented by bit2, and a result of the checksum of the TB0 of the fourth subframe of the consecutive 4 subframes and the CRC check result of the TB1 is represented by bit 3.

Or, the ACK or NACK message may also include N bits, where the value range of N is 1 to 32, but may also be greater than 32.

Step 307: the UE MAC sends the constructed ACK or NACK message to the eNB MAC, and the ACK or NACK message comprises: CRC results for each TB;

step 308: and the eNB MAC confirms the receiving state of the TB according to the CRC result of each TB in the received ACK or NACK message. Such as which TB received successfully, which TB received failed, etc.

Based on the implementation process of the foregoing method, an embodiment of the present invention further provides a base station, whose schematic structural diagram is shown in fig. 4, where the base station includes: the device comprises a determining unit 41, a transmitting unit 42, a receiving unit 43 and a confirming unit 44, wherein the determining unit 41 determines the corresponding relation between the TB number of the TB required to be received by the UE and the code word number; a sending unit 42, configured to send a downlink control message DCI and a TB to the user equipment after the determining unit 41 determines the corresponding relationship between the TB number of the TB that the UE needs to receive and the code word number, where the DCI includes: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number; a receiving unit 43, configured to receive an ACK or NACK message fed back by the ue, where the ACK or NACK message includes cyclic redundancy check CRC results of each TB number; a confirming unit 44, configured to confirm the reception status of the TBs according to the CRC results of the respective TBs received by the receiving unit 43.

Optionally, the ACK or NACK message received by the receiving unit may include: bit0 and bit1, where bit0 represents the CRC result for TB0 and bit1 represents the CRC result for TB 1; or, the bit0 represents the result of CRC result and of consecutive 4 subframes TB0, and the bit1 represents the result of CRC result and of consecutive 4 subframes TB 1; or N bits, each bit in turn representing the result of the AND of the CRC result of TB0 with the CRC result of TB1 for each of the N subframes, where N is 3 ≦ N ≦ 32.

With the development of the communication technology, N bits are included in the ACK or NACK message, and a value range of N may be any one of 3 to 32, or may be greater than or equal to 32, which is not limited in this embodiment.

The implementation process of each unit in the base station is detailed in the corresponding implementation process in the above method, and is not described herein again.

The embodiment of the present invention further provides a user equipment, a schematic structural diagram of which is shown in fig. 5 in detail, where the user equipment includes a first processing unit 51 and a second processing unit 52, where the first processing unit 51 is configured to receive a downlink control message DCI and a transport block TB sent by a base station, and obtain each TB according to the DCI; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB; wherein the DCI may include: UE needs to receive the corresponding relation between the TB number of the TB and the code word number; analyzing the received TB data to obtain data corresponding to the code words, and obtaining the TB corresponding to each TB number according to the corresponding relation between the TB number and the code word number in the DCI; performing hybrid automatic repeat request HARQ merging processing on the TBs according to the obtained TB numbers to obtain CRC results of the TBs; a second processing unit 52, configured to construct an ACK or NACK message according to the CRC result of each TB obtained by the first processing unit, and send the constructed ACK or NACK message to a base station.

Optionally, the first processing unit 51 includes: a receiving unit 511, a determining unit 512, and a combining processing unit 513; the second processing unit 52 includes: a construction unit 521 and a transmission unit 522. The structural diagram is shown in fig. 6 in detail, which is another structural diagram of the user equipment.

The receiving unit 511 is configured to receive DCI and a TB sent by a base station, where the DCI includes: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number; a determining unit 512, configured to analyze the received TB data to obtain data corresponding to a codeword, and obtain a TB corresponding to each TB number according to a corresponding relationship between the TB number and the codeword number in the DCI; combining processing section 513 performs hybrid automatic repeat request HARQ combining processing on the TBs using the TB numbers obtained by determining section 512, and obtains CRC results for the respective TBs. The constructing unit 521 is configured to construct an ACK or NACK message according to the CRC result of each TB obtained by the merging processing unit; a transmitting unit 522, configured to transmit the ACK or NACK message constructed by the constructing unit 521 to the base station.

The ACK or NACK message constructed by the construction unit comprises:

the CRC result of TB0 is represented by bit0 and the CRC result of TB1 is represented by bit 1; or

Bit0 indicates the result of CRC result and of TB0 of a plurality of consecutive subframes, and bit1 indicates the result of CRC result and of TB1 of a plurality of consecutive subframes; or

An embodiment of the present invention further provides a data transmission system, a schematic structural diagram of which is shown in fig. 7 in detail, including: a base station 71 and a user equipment 72, wherein,

the base station 71 is configured to determine a corresponding relationship between a TB number of the user equipment and a code word number, and send a downlink control message DCI and a TB to the user equipment, where the DCI includes: the corresponding relation between the TB number of the user equipment and the code word number; when receiving a positive Acknowledgement (ACK) or Negative Acknowledgement (NACK) message fed back by the user equipment, confirming the receiving state of the TB according to the CRC result of each TB in the ACK or NACK message;

the user equipment 72 is configured to receive DCI and TB sent by a base station, analyze data of the TB to obtain data corresponding to a codeword, and obtain a TB corresponding to each TB number according to a corresponding relationship between a TB number and the codeword number in the DCI; carrying out HARQ merging processing on the TBs according to the TB numbers to obtain CRC results of the TBs; and constructing an ACK or NACK message according to the CRC result of each TB, and feeding back the ACK or NACK message to a base station.

Optionally, the base station 71 includes: a determination unit 711, a transmission unit 712, a reception unit 713, and a confirmation unit 714; the user equipment 72 includes: the functions and functions of the receiving unit 721, the determining unit 722, the combining processing unit 723, the constructing unit 724, and the sending unit 725 are described in detail in the above embodiments, and are not described herein again. The receiving unit 721, the determining unit 722 and the combining processing unit 723 may be integrated in the first processing unit or may be deployed independently; the constructing unit 724 and the sending unit 725 may be integrated in the second processing unit, or may be deployed independently, which is not limited in this embodiment.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.

The foregoing is only an alternative embodiment of the present invention, and it should be noted that modifications and adaptations can be made by those skilled in the art without departing from the principle of the present invention, and should be considered as the scope of the present invention.

Claims

1. A method of data transmission, comprising:

determining the corresponding relation between the TB number of the transmission block TB required to be received by the user equipment and the code word number;

sending downlink control messages DCI and TB to user equipment, wherein the DCI comprises: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number;

2. The method of claim 1, wherein if two TBs of the ue are included in a subframe, the ACK or NACK message comprises: 2 bits, where bit0 represents the CRC result for the 0 th TB and bit1 represents the CRC result for the 1 st TB.

3. The method of claim 1, wherein if two TBs of the ue are included in a subframe, the ACK or NACK message comprises: and 2 bits, wherein bit0 indicates a result of CRC result and-sum of 0 th TBs of consecutive subframes, and bit1 indicates a result of CRC result and-sum of 1 st TBs of consecutive subframes.

4. The method of claim 3, wherein the ACK or NACK message comprises: n bits, each bit sequentially representing the result of the AND of the CRC result of TB0 and the CRC result of TB1 of each of the N subframes, wherein N is more than or equal to 3 and less than or equal to 32; the TB0 is the 0 th TB of the two TBs; the TB1 is the 1 st TB of the two TBs.

5. A method of data transmission, comprising:

receiving downlink control information DCI and a transmission block TB sent by a base station, and obtaining the TB corresponding to each TB number according to the corresponding relation between the TB number in the DCI and the code word number; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB;

6. The method of claim 5, wherein the receiving base station receives a downlink control message DCI and a transport block TB sent by the base station, and obtains each TB according to the DCI; and performing hybrid automatic repeat request HARQ combining processing on each TB, and obtaining a CRC result for each TB specifically includes:

receiving DCI and TB sent by a base station, wherein the DCI comprises: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number;

analyzing the received TB data to obtain data corresponding to code words, and obtaining the TB corresponding to each TB number according to the corresponding relation between the TB number and the code word number in the DCI;

and performing hybrid automatic repeat request HARQ merging processing on the TBs according to the obtained TB numbers to obtain CRC results of the TBs.

7. The method according to claim 5 or 6, wherein if a subframe includes two corresponding TBs, the constructing an ACK or NACK message according to the CRC result of each TB specifically includes:

Sequentially representing the result of the AND of the CRC result of the TB0 and the CRC result of the TB1 of each subframe of the N subframes by using each bit of the N bits, wherein N is more than or equal to 3 and less than or equal to 32; the TB0 is the 0 th TB of the two TBs; the TB1 is the 1 st TB of the two TBs.

8. A base station, comprising:

a determining unit, configured to determine a corresponding relationship between a TB number and a codeword number of a transport block TB that needs to be received by a user equipment UE;

a sending unit, configured to send a downlink control message DCI and a TB to the user equipment after the determining unit determines the corresponding relationship between the TB number of the user equipment and the code word number, where the DCI includes: the user equipment needs to receive the corresponding relation between the TB number of the TB and the code word number;

a receiving unit, configured to receive an ACK or NACK message fed back by user equipment, where the ACK or NACK message includes Cyclic Redundancy Check (CRC) results of each TB;

and the confirming unit is used for confirming the receiving state of the TB according to the CRC result of each TB received by the receiving unit.

9. The base station of claim 8, wherein the ACK or NACK message received by the receiving unit comprises:

2 bits, where bit0 represents the CRC result for TB0 and bit1 represents the CRC result for TB 1; or,

bit0 indicates the result of CRC result and-sum of TBs 0 of consecutive subframes, and bit1 indicates the result of CRC result and-sum of TBs 1 of consecutive subframes; or

N bits, each bit sequentially representing the result of the AND of the CRC result of TB0 and the CRC result of TB1 of each of the N subframes, wherein N is more than or equal to 3 and less than or equal to 32; the TB0 is the 0 th TB of the two TBs; the TB1 is the 1 st TB of the two TBs.

10. A user device, comprising:

the first processing unit is used for receiving a downlink control message DCI and a transmission block TB sent by a base station, and obtaining the TB corresponding to each TB number according to the corresponding relation between the TB number in the DCI and the code word number; performing hybrid automatic repeat request HARQ merging processing on each TB to obtain a CRC result of each TB;

11. The user equipment of claim 10, wherein the first processing unit comprises:

a receiving unit, configured to receive DCI and a TB transmitted by a base station, where the DCI includes: the UE needs to receive the corresponding relation between the TB number of the TB and the code word number;

the determining unit is used for analyzing the received TB data to obtain data corresponding to code words, and obtaining the TB corresponding to each TB number according to the corresponding relation between the TB number and the code word number in the DCI;

and the combining processing unit is used for carrying out hybrid automatic repeat request HARQ combining processing on the TBs according to the TB numbers obtained by the determining unit to obtain CRC results of the TBs.

12. The user equipment according to claim 10 or 11, wherein the second processing unit comprises:

a constructing unit, configured to construct an ACK or NACK message according to the CRC result of each TB obtained by the combining processing unit;

a sending unit, configured to send the ACK or NACK message constructed by the construction unit to a base station.

13. The UE of claim 12, wherein the ACK or NACK message constructed by the construction unit comprises:

14. A data transmission system, comprising: a base station and a user equipment, wherein,

a base station, configured to determine a corresponding relationship between a TB number and a codeword number of a transport block TB that needs to be received by a user equipment, and send a downlink control message DCI and TB to the user equipment, where the DCI includes: the user equipment needs to receive the corresponding relation between the TB number of the TB and the code word number; when receiving a positive Acknowledgement (ACK) or Negative Acknowledgement (NACK) message fed back by the user equipment, confirming the receiving state of the TB according to the CRC result of each TB in the ACK or NACK message;