WO2013139259A1

WO2013139259A1 - Coding transmission method and system in orthogonal frequency division multiplexing (ofdm) access system

Info

Publication number: WO2013139259A1
Application number: PCT/CN2013/072881
Authority: WO
Inventors: 关艳峰; 左志松; 陈宪明; 张峻峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-03-19
Filing date: 2013-03-19
Publication date: 2013-09-26
Also published as: CN103326756A

Abstract

A coding transmission method and system in orthogonal frequency division multiplexing (OFDM) access system. The method comprises joint-coding the bits of system data required to be transmitted in M transmission time intervals (TTIs) to obtain the channel coding blocks, and transmitting the channel coding blocks in M TTIs, wherein the number of redundancy version of the channel coding blocks is at least two, M being an integer greater than one.

Description

Coding transmission method and system in orthogonal frequency division multiple access system

Technical field

The present invention relates to the field of communications, and in particular, to a code transmission method and system in an Orthogonal Frequency Division Multiplexing Access (OFDMA) system. Background technique

With the rapid development of wireless communication technology, limited spectrum resources have gradually become the main factor restricting the development of wireless communication, but it is the limited spectrum resources that have stimulated the emergence of new technologies. In the wireless communication system, capacity and coverage are two important performance indicators. In order to increase the capacity, the same frequency mode is used for networking. However, the same-frequency mode network increases inter-cell interference, resulting in a decrease in coverage performance.

In the Long Term Evolution (LTE) system, the Orthogonal Frequency Division Multiplexing Access (OFDMA) technology is used in the downlink, which can significantly reduce the interference in the cell. With the same frequency networking, Inter-Cell Interference (ICI) is significantly increased. In order to reduce ICI, LTE has also standardized a number of technologies, for example, Inter-Cell Interference Cancellation (ICIC). The downlink ICIC technology implements the downlink interference pre-alert function based on the eNodeB's Relative Narrowband TX Power (RNTP) limitation, and enhances the coverage performance of the Physical Downlink Shared Channel (PDSCH). The Single Carrier-Frequency Division Multiplexing Access (SC-FDMA) technology is used to significantly reduce the peak-to-average ratio of the UE and improve the signal quality. However, the same frequency is used. Networking, small-interval interference ICI increased significantly. In order to reduce ICI, the LTE uplink also standardizes many technologies, for example, uplink/ΟΙ-based ICIC technology, which enhances the Physical Uplink Shared Channel (PUSCH).

In addition, multiple input multiple output (MIMO) technology can improve the coverage performance and capacity performance of LTE systems through spatial diversity, spatial multiplexing and beamforming technologies, especially the multi-point cooperation developed based on MIMO technology. (Coordinated Multiple Point, CoMP) technology. But due to the current network and the future, the terminal (User Equipment, The UEs are all single-antenna transmission. The improvement of the uplink for MIMO technology and CoMP technology is limited, and can only be improved by the Joint Receiver (JR) at the receiving end.

Also, Channel Coding technology has an important contribution to improving link transmission performance, enabling data to withstand various fading of the channel.

Although there are many technologies in the LTE system that can improve the transmission performance of the system, especially the network coverage performance, at present, through experimental network testing and simulation, it is found that the medium-rate PUSCH and the high-rate PDSCH are still the coverage performance of each channel in the LTE system. Restricted channel. The main reason is that the UE's limited transmit power results in a medium-rate PUSCH limitation, while the inter-base station ICI results in a high-rate PDSCH. This puts forward a demand for the improvement of the coverage performance of the LTE system, and in the prior art, no method for continuously improving the coverage performance based on the prior art has been found.

Summary of the invention

We found that the minimum unit of scheduling in the LTE system is one Transmission Time Interval (TTI), and the channel coding is also performed in the TTI. Since each TTI transmission guarantees that the system provides medium-rate or high-rate capacity services, it is difficult to guarantee the coverage of the system. The coding of the LTE system has a feature that the channel coding module adapts the data to be transmitted into channel block (Transmission Block, TB) of various sizes according to the current channel state according to the data size of each TTI transmission. The code rate and the channel coding block length (TB Size, TBS) have different decoding performances, thereby affecting coverage performance. Therefore, according to the characteristics of channel coding, an encoding transmission method for coverage enhancement is proposed.

The present invention provides a coding transmission method and system in an orthogonal frequency division multiple access system, and the technical problem to be solved is how to improve the probability of successful decoding at the receiving end.

In order to solve the above technical problem, the present invention provides the following technical solutions:

An encoding transmission method in an orthogonal frequency division multiple access system includes:

Coding the system data bits that need to be transmitted in the M transmission time interval TTI to obtain a channel coding block;

Transmitting channel coding blocks through M TTIs, wherein the redundancy version of the channel coding block is at least Two, where M is an integer greater than one.

Preferably, the method further has the following features: the jointly coding the data to be sent in the M transmission time interval TTI to obtain a channel coding block, including:

The system data bits of the total length L1 carried in the M TTIs are jointly coded, and a mother code of size L2 is obtained, where L2>L1;

At least two redundancy versions of the channel coding block are generated from the mother code.

Preferably, the method further has the following feature: each TTI of the M TTIs sends a redundancy version of the channel coding block.

Preferably, the method further has the following feature: generating at least two redundancy versions of the channel coding block according to the mother code, including:

Allocating resources in M TTIs, the resource unit is resource block RB;

The length of the redundancy version is determined according to the number of RBs used to transmit the resources allocated in the redundancy version of the TTI, and at least two redundancy versions of the channel coding block are generated.

Preferably, the method further has the following feature: the number of RBs allocated by each TTI in the M TTIs is the same, and the number of RBs is determined according to channel state information corresponding to one or more TTIs in the M TTIs.

Preferably, the method further has the following feature: the number of RBs allocated in each TTI of the M TTIs is different, and the number of RBs allocated to each TTI is determined according to channel state information corresponding to the corresponding TTI.

Preferably, the method further has the following feature: the code rate of the redundancy version is greater than that of a single pair, and the method further has the following feature:: a redundancy version of a channel coding block generated according to the mother code The number is less than or equal to M.

Preferably, the method further has the following features:: sending, by using the M TTIs, the jointly coded channel coding block, further comprising:

The sequence number information of the number of RBs used in each of the M TTIs and/or the redundancy version is indicated by one or more physical downlink control channel PDCCHs. Preferably, the method further has the following features:

When indicated by a physical downlink control channel, the physical downlink control channel corresponding to the first one of the M TTIs is indicated;

When indicated by multiple physical downlink control channels, the M physical downlink control channels corresponding to the M TTIs in the M TTIs are indicated.

Preferably, the method further has the following feature: the device that sends the jointly coded channel coding block is a base station, a terminal, a relay station, or a home base station.

An encoding transmission system in an orthogonal frequency division multiple access system includes:

The coding device is configured to: jointly code the system data bits to be transmitted in the M transmission time intervals TTI to obtain a channel coding block;

The transmitting device is configured to: connect to the encoding device, and send a channel coding block by using M TTIs, where the redundancy version of the channel coding block is at least two, where M is an integer greater than 1.

Preferably, the system further has the following features: The encoding device includes:

The coding module is configured to: jointly code the data bits of the L1 system carried in the M TTIs to obtain a mother code of size L2, where L2>L1;

And a generating module, configured to: connect to the encoding module, and generate at least two redundancy versions of the channel coding block according to the mother code.

Preferably, the system further has the following feature: each of the M 使用s used by the transmitting device sends a redundancy version of the channel coding block.

Preferably, the system further has the following features: the generating module includes:

The allocation unit is configured to allocate resources in the M TTIs, the resource unit is the resource block RB, and the generating unit is configured to be connected to the allocation unit, and according to the number of RBs allocated for the resource allocated in the redundancy version The length of the redundancy version is determined to generate at least two redundancy versions of the channel coding block.

Preferably, the system further has the following features: each TTI allocated in the M TTIs

The number of RBs is the same, and the number of RBs is determined according to channel state information corresponding to one or more TTIs of the M TTIs. Preferably, the system further has the following feature: the number of RBs allocated in each TTI of the M TTIs is different, and the number of RBs allocated by each TTI is determined according to channel state information corresponding to the corresponding TTI.

Preferably, the system further has the following features: the code rate of the redundancy version is greater than that of a single pair, and the system further has the following features: a redundancy version of a channel coding block generated according to the mother code The number is less than or equal to M.

Preferably, the system further has the following features: The sending device further includes:

The indication module is configured to: indicate the number of RBs used by each TTI in the M TTIs and/or the sequence number information of the redundancy version by one or more physical downlink control channels.

Preferably, the system further has the following features: the indication module is configured to:

Preferably, the system further has the following features: The system is applied to a base station, a terminal, a relay station or a home base station.

The embodiment provided by the present invention, by transmitting at least two redundancy versions of the channel coding block, so that the receiving end finds that the decoding fails after receiving a complete redundancy version, and performs the decoding operation again by receiving another redundancy version. Until receiving the data that can be decoded, when the channel coding block that only transmits one redundancy version is overcome, once the received channel coding block of the redundancy version cannot be successfully decoded, the transmission operation fails, and the reception is improved. The probability of successful decoding. BRIEF abstract

1 is a schematic flowchart of an embodiment of an encoding transmission method in an orthogonal frequency division multiple access system according to the present invention;

2 is a schematic diagram of uplink transmission in an existing system; 3 is a schematic diagram 1 of uplink transmission in the improved system of the present invention;

Figure 4 is a schematic diagram of uplink transmission in the improved system of the present invention 2;

Figure 5 is a schematic diagram of uplink transmission in the improved system of the present invention 3;

Figure 6 is a schematic diagram of uplink transmission in the improved system of the present invention 4;

Figure 7 is a schematic diagram of uplink transmission in the improved system of the present invention 5;

Figure 8 is a block diagram showing the structure of an encoding transmission system in an orthogonal frequency division multiple access system provided by the present invention. Preferred embodiment of the invention

The invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

FIG. 1 is a schematic flowchart diagram of an embodiment of an encoding transmission method in an orthogonal frequency division multiple access system according to the present invention. The method embodiment shown in FIG. 1 includes:

Step 101: Perform joint coding on system data bits to be transmitted in the M transmission time intervals TTI to obtain a channel coding block.

Step 102: Send a channel coding block by using M TTIs, where the redundancy version of the channel coding block is at least two, where M is an integer greater than 1.

The method provided by the present invention, by transmitting at least two redundancy versions of the channel coding block, so that after receiving a complete redundancy version, the receiving end finds that the decoding fails, and then performs decoding again by receiving another redundancy version. Operation, until receiving data that can be decoded, overcoming M ΤΉ When only one redundant version of the channel coding block is transmitted, once the received channel coding block of the redundancy version cannot be successfully decoded, the transmission operation fails. , improving the probability of successful decoding at the receiving end, thereby improving the coverage performance of the wireless network.

The method embodiments provided by the present invention are further described below:

First, step 101 in the above method embodiment is explained:

Step A1, combining the total length of the L1 system data bits carried in the M TTIs Encoding to obtain a mother code of size L2, where L2>L1;

Step A2: Generate at least two redundancy versions of the channel coding block according to the mother code.

The number of redundancy versions of the channel coding block generated according to the mother code is less than or equal to M. Allocating resources in M TTIs, the resource unit is resource block RB;

The number of RBs allocated by each TTI in the M TTIs is the same, and the number of RBs is determined according to channel state information corresponding to one or more TTIs; specifically, according to one TTI, any one of M TTIs may be used. The channel state information corresponding to the TTI is determined, for example, the channel information corresponding to the first TTI, and the channel state information corresponding to the multiple TTIs is understood to be: according to channel state information corresponding to at least two TTIs of the M TTIs, respectively Determining the number of RBs, thereby obtaining at least two RB numbers, by averaging the obtained at least two RB numbers, or selecting a minimum value as the number of RBs allocated to each TTI in the final M TTIs, or according to The channel state information corresponding to the plurality of TTIs obtains one channel state information, thereby determining the number of RBs.

Certainly, the number of RBs allocated by each TTI in the M TTIs may be different, and the number of RBs allocated to each ΤΉ is determined according to channel state information corresponding to the corresponding TTI. Correspondingly, when notifying the number of RBs at the receiving end, it is necessary to notify the number of RBs of each TTI, and the former only needs to notify one number. The code rate of the redundancy version is greater than the code rate of the redundancy version of the same sequence number generated by separately coding data to be sent in one TTI. This is because when the data bits carried in the M TTIs are jointly encoded, the MAC (Media Access Control) layer can add only one MAC header for the jointly encoded data, and M MAC headers are required for independent encoding. Thus, the maximum savings of M-1 MAC headers are achieved.

The following describes step 102 in the above method embodiment:

The redundancy version of the channel coding block sent by the M TTIs is at least two, and the specific understanding is as follows:

For example, if two redundant versions of the channel coding block are generated, they are respectively and 8. One way is to divide A into m small blocks, divide B into n small blocks, and send m+n small blocks through M TTIs, where m+n small blocks can be freely allocated in M TTIs. Configuration

Alternatively, each of the TTIs transmits a redundant version of the channel coding block, for example, the first transmission, the second transmission, and the like.

For the latter, since the channel coding block transmitted in each frame is a complete redundancy version, the receiving end can perform the decoding operation directly after receiving the channel coding block sent in the first frame, without Wait for the subsequent data to be received before decoding. Compared with the former method, since the data of the same redundancy version may be allocated to different ΤΤΙ, when decoding a redundancy version is completed, it is necessary to wait until the 承载 of the small version carrying the redundancy version is completely transmitted. Only, the waiting time of the decoding operation is long; in addition, since the channel coding block transmitted in each frame is a complete redundancy version, for the receiving end, each time a channel coding block transmitted within one frame is received, The decoding operation can be performed once. In contrast, the former method is different in the same redundancy version of the channel coding block, and the small blocks are allocated in different frames, and the channel coding block transmitted in one frame cannot be guaranteed. A decoding operation can be performed once. Therefore, the latter method provides a decoding opportunity for the receiving end in a shorter time than the former method. And compared with the following scheme: If two redundant versions of channel coding blocks are generated, respectively, Α and Β, or only one redundancy version of the channel coding block is generated, and only one channel coding is transmitted within M TTIs The redundancy version of the block, the transmission method is to divide the redundancy version into M small blocks, and each TTI sends out a small block.

The probability of successful decoding is improved by the ability to transmit multiple redundancy versions.

The code rate of the channel coding block sent in each TTI is determined according to the channel state information on the resources occupied by the channel carrying the channel coding block, because the channel state information determines the number of RBs.

Optionally, the jointly coding the channel coding block by using the M TTIs further includes: indicating, by using one or more physical downlink control channels, the PDCCH, the number of RBs and/or the redundancy version used by each of the T TTIs. Serial number information.

Specifically, when indicated by one physical downlink control channel: indicated by a physical downlink control channel corresponding to a first one of the M TTIs; when indicated by multiple physical downlink control channels, by using the M TTIs M physical downlink control channel indications corresponding to M TTIs. The following describes the specific embodiment: Embodiment 1:

In this embodiment:

It is illustrated by the solution in the existing system and the solution in the improved system.

In FIG. 2, in order to support uplink medium-rate transmission, for example, to support services close to 384 kbps, each TTI transmission is usually selected, for example, a transport block size (TBS) TBS=392 bits per TTI transmission, where The transport block is the system data, and can be replaced with each other when there is no ambiguity. At this time, each TTI carries one TB, and an important feature is that each ΤΉ data 392 bits is independently coded to form a mother code with a code rate of 1/3, and then multiple redundancy versions are generated according to the mother code, and then transmitted, and The transmission control information of the TB, such as the resource location and the number of RBs, is indicated in the corresponding PDCCH of n-4.

In Figure 3, also to support uplink medium-rate transmission, for example, when supporting services close to 384 kbps, if four TTIs are jointly coded, the data to be transmitted in the four frames is cascaded to approximately 392x4=1568 bits. , the TB that the system can support, such as 1544bits, or 1608bits. Then, 1544bits or 1608bits is jointly coded to form a mother code with a code rate of 1/3, and then multiple redundancy versions are generated according to the mother code, and multiple redundancy versions are transmitted in 4 TTIs, and 4 are generated in FIG. Redundant version, one redundancy version is transmitted per TTI. The resource allocation in the four TTIs indicates the transmission control information indicating M ΤΉ in the t-4 PDCCH corresponding to the first uplink TTI (for example, TTI t ), for example, the sequence number information of the redundancy version, the resource location, the number of RBs, and the like. information.

In the improved system, since the joint coding is used, the coding gain of the receiving end is increased, thereby improving the system coverage performance.

Embodiment 2:

In this embodiment:

The difference from the first embodiment is:

In FIG. 4, the resource allocation in the four TTIs respectively indicates the transmission control information in the PDCCH corresponding to the uplink TTK (for example, TTI t, indicated by the PDCCH in the TTI t-4), for example, the serial number information and resources of the redundancy version. Information such as location and number of RBs. For the two embodiments described above, it should be noted that:

The data that needs to be jointly coded, that is, the system data bits to be transmitted in the M TTIs is a continuous service flow, and the transmission of the channel coding blocks obtained after the joint coding may be transmitted in consecutive M frames or through Transmission in discontinuous M TTIs, in simple terms, as long as the channel coding module can be finally sent out. In addition, the transmission order of the redundancy version of the channel coding block may also be RVO, RV1, RV2, RV3, and will not be described again.

Referring to the transmission modes shown in FIG. 3 and FIG. 4, the channel coding blocks obtained after the joint coding are transmitted through consecutive M TTIs, and the size of the channel coding blocks sent by each TTI is the same, the difference is that In FIG. 3, the physical downlink control channel corresponding to the first TTI of the M TTIs is used to indicate the transmission control information, and the M physical downlink control channels corresponding to the M TTIs are used to perform the transmission control information of the corresponding TTIs. One by one instructions.

Referring to the transmission modes shown in FIG. 5 to FIG. 7, the channel coding blocks obtained after the joint coding are not transmitted through consecutive M TTIs, and all the channel coding blocks in the manner shown in FIG. 5 are not passed. The continuous TTI is sent out. In contrast, in the manner shown in FIG. 6 and FIG. 7, two channel coding blocks are transmitted through consecutive TTIs, and the other two are not transmitted through consecutive TTIs. Specifically:

In FIG. 5, the physical downlink control channel corresponding to the first TTI of the M TTIs is used to indicate the transmission control information, and of course, the MTIs corresponding to the M physical downlink control channel pairs corresponding to the M TTIs may be used. The transmission control information is indicated one by one. Of course, since the used TTI is not continuous, correspondingly, the M physical downlink control channels for indicating the transmission control information are not continuous.

Figure 6 is similar to Figure 5 and will not be described here.

7 is an example of performing the indication of the transmission control information of the corresponding TTI by the M physical downlink control channels corresponding to the M TTIs. Of course, the physics corresponding to the first TTI of the M TTIs may also be used. The downlink control channel indicates the transmission control information, wherein different from FIG. 3 to FIG. 6 , the number of data bits to be jointly coded in the M TTIs in the example shown in FIG. 7 are respectively K1, K2, K3 and K4, L1= K1+K2+K3+K4, unlike the ones shown in Figures 3 to 6, are K, U = 4K. The transmitting end in the present invention may be a device such as a station, a home base station, a relay station, or the like, or may be a communication terminal, a notebook computer, a handheld computer or the like. Similarly, the receiving end is configured to receive the data signal of the transmitting end, and the receiving end may be a terminal device such as a mobile phone, a notebook computer, a handheld computer, or a control device such as a base station or a relay station. FIG. 8 is a schematic structural diagram of an encoding transmission system in an orthogonal frequency division multiple access system according to the present invention. In combination with the method described above, the system of Figure 8 includes:

The encoding device 801 is configured to jointly encode the system data bits that need to be transmitted in the M transmission time intervals TTI to obtain a channel coding block.

The transmitting device 802 is connected to the encoding device 801, and is configured to send a channel coding block by using M TTIs, where the redundancy version of the channel coding block is at least two, where M is an integer greater than 1.

The encoding device includes:

The coding module is configured to jointly encode the data bits of the L1 system carried in the M TTIs to obtain a mother code of size L2, where L2>L1;

And a generating module, connected to the encoding module, configured to generate at least two redundancy versions of the channel coding block according to the mother code.

Each of the M TTIs used by the transmitting device transmits a redundancy version of a channel coding block.

The generating module includes:

An allocating unit, configured to allocate resources in the M TTIs, where the resource unit is a resource block RB, and a generating unit, connected to the allocating unit, configured to determine redundancy according to the number of RBs used to send resources allocated in the redundancy version of the TTI The length of the remaining version, generating at least two redundancy versions of the channel coding block.

The number of RBs allocated by each TTI in the M TTIs is the same, and the number of RBs is determined according to channel state information corresponding to one or more TTIs; or, the number of RBs allocated in each TTI of the M TTIs is different. , where the number of RBs allocated to each TTI is based on its correspondence The channel state information corresponding to the TTI is determined.

The code rate of the redundancy version is greater than the code rate of the redundancy version of the same sequence number generated by separately encoding data to be transmitted in one frame.

The number of redundancy versions of the channel coding block generated according to the mother code is less than or equal to Μ. Optionally, the sending device further includes:

And an indication module, configured to indicate sequence number information of the number of RBs and/or redundancy versions used by each of the ones through one or more physical downlink control channel PDCCHs.

Specifically, the indication module is used to:

When indicated by a physical downlink control channel, the physical downlink control channel indication corresponding to the first one of the ΤΤΙ ; is indicated;

When indicated by multiple physical downlink control channels, the physical downlink control channel indication corresponding to one of the ΤΤΙ ΤΉ is indicated.

The system is applied to a base station, a terminal, a relay station, or a home base station.

The system embodiment provided by the present invention, by transmitting at least two redundancy versions of the channel coding block, so that after receiving a complete redundancy version, the receiving end finds that the decoding fails, and then performs decoding again by receiving another redundancy version. Operation, until receiving the data that can be decoded, overcoming the transmission of only one redundant version of the channel coding block, once the received redundancy version of the channel coding block cannot be successfully decoded, causing the transmission operation to fail, thereby improving The probability that the receiver will decode successfully.

It will be understood by those skilled in the art that all or part of the steps of the above embodiments may be implemented using a computer program flow, which may be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any particular combination of hardware and software.

Each device/function module/functional unit in the above embodiment can use a general-purpose computing device. Implementations can be centralized on a single computing device or distributed across a network of multiple computing devices.

Each device/function module/functional unit in the above embodiments can be stored in a computer readable storage medium when implemented in the form of a software function module and sold or used as a standalone product. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Industrial applicability

The embodiment provided by the present invention, by transmitting at least two redundancy versions of the channel coding block, so that the receiving end finds that the decoding fails after receiving a complete redundancy version, and performs the decoding operation again by receiving another redundancy version. Until receiving the data that can be decoded, when the channel coding block that only transmits one redundancy version is overcome, once the received channel coding block of the redundancy version cannot be successfully decoded, the transmission operation fails, and the reception is improved. The probability of successful decoding.

Claims

Claim

1. An encoding transmission method in an orthogonal frequency division multiple access system, comprising:

The channel coding block is transmitted through M TTIs, wherein the channel coding block has a redundancy version of at least two, where M is an integer greater than one.

2. The method according to claim 1, wherein the data to be transmitted in the M transmission time intervals 联合 is jointly encoded to obtain a channel coding block, including:

3. The method of claim 2, wherein each of the M TTIs transmits a redundancy version of the channel coding block.

4. The method according to claim 3, wherein generating at least two redundancy versions of the channel coding block according to the mother code comprises:

Allocating resources in M TTIs, the resource unit is resource block RB;

The method according to claim 4, wherein the number of RBs allocated by each TTI in the M TTIs is the same, and the number of RBs is determined according to channel state information corresponding to one or more TTIs in the M TTIs.

The method of claim 4, wherein the number of RBs allocated in each TTI is different, and the number of RBs allocated by each TTI is determined according to channel state information corresponding to the corresponding TTI. .

The method according to any one of claims 2 to 4, wherein the redundancy version has a large code rate The code rate of the redundancy version of the same sequence number generated by separately encoding the data to be transmitted within one TTI.

The method according to claim 3, wherein the number of redundancy versions of the channel coding block generated according to the mother code is less than or equal to M.

The method according to claim 1, wherein the jointly coding the channel coding block by using the M TTIs further includes:

The sequence number information of the number of RBs and/or redundancy versions used by each of the T TTIs is indicated by one or more physical downlink control channels PDCCH.

10. The method according to claim 9, wherein

The method according to claim 1, wherein the device that transmits the jointly coded channel coding block is a base station, a terminal, a relay station, or a home base station.

12. A coded transmission system in an orthogonal frequency division multiple access system, comprising:

The system according to claim 12, wherein the encoding device comprises: an encoding module, configured to: jointly encode the L1 system data bits carried in the M TTIs to obtain a size L2 Mother code, where L2>L1;

14. The system according to claim 13, wherein each of the M TTIs used by the transmitting device transmits a redundancy version of a channel coding block.

The system according to claim 14, wherein the generating module comprises: an allocating unit, configured to: allocate resources in M TTIs, the resource unit is a resource block RB; and generate a unit, set to: The units are connected, and the length of the redundancy version is determined according to the number of RBs of resources allocated for transmitting the redundancy version, and at least two redundancy versions of the channel coding block are generated.

The system according to claim 15, wherein the number of RBs allocated by each TTI in the M TTIs is the same, and the number of RBs is determined according to channel state information corresponding to one or more of the M cells.

The system according to claim 15, wherein the number of allocated RBs in each of the M TTIs is different, and the number of RBs allocated to each TTI is determined according to channel state information corresponding to the corresponding ΤΉ .

The system according to any one of claims 13 to 15, wherein the redundancy version has a code rate greater than a code rate of a redundancy version of the same sequence number generated by separately encoding data to be transmitted in one TTI.

The system according to claim 14, wherein the number of redundancy versions of the channel coding block generated based on the mother code is less than or equal to M.

The system according to claim 12, wherein the sending device further comprises: an indication module, configured to: indicate, by using one or more physical downlink control channels, a PDCCH, a number of RBs used by each of the M TTIs / or serial number information of the redundancy version.

The system according to claim 20, wherein the indication module is configured to: when indicated by a physical downlink control channel, indicate by a physical downlink control channel corresponding to a first one of the M TTIs;

Passing M TTI pairs in M TTIs when indicated by multiple physical downlink control channels M physical downlink control channel indications.

22. The system of claim 12, wherein the system is applied to a base station, a terminal, a relay station, or a home base station.