WO2012019494A1

WO2012019494A1 - Relay link hybrid automatic repeat request (harq) transmission method and apparatus in a time division dual system

Info

Publication number: WO2012019494A1
Application number: PCT/CN2011/076441
Authority: WO
Inventors: 吴栓栓; 毕峰; 袁弋非; 杨瑾; 袁明; 梁枫
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-08-13
Filing date: 2011-06-27
Publication date: 2012-02-16
Also published as: CN102377550A; CN102377550B

Abstract

The present invention discloses a relay link Hybrid Automatic Repeat Request (HARQ) transmission method and apparatus in a Time Division Dual (TDD) system, wherein the method and apparatus are used for realizing the reasonable settings of a relay link HARQ time sequence. The technical solution is: for the subframe uplink-downlink configuration supporting relay transmission in the TDD system, according to the locations of uplink relay subframes and of downlink relay subframes in the subframe uplink-downlink configuration, a HARQ time sequence relationship of the relay transmission is determined. With the present invention, the reliability of the relay link data transmission and the efficiency of the HARQ transmission are ensured effectively. At the same time, in the present invention, the effect on the HARQ time sequence of a terminal, which is subordinate to a relay station, is avoided and the backward compatibility to the terminal is ensured.

Description

Relay link HARQ transmission method and device for time division duplex system

The present invention relates to the field of mobile communications, and in particular, to a HARQ (Hybrid-Automatic Repeat Request) transmission method and apparatus for a relay link of a time division duplex system. Background technique

The development of mobile communications requires support for higher transmission rates, better signal coverage, and higher resource utilization. Relay technology can increase coverage and balance, increase cell throughput, and the relay station has a relatively small configuration cost compared to the base station, so the relay is regarded as an evolution system of Long Term Evolution (LTE). -- A key technology in the LTE-Advanced (LTE-A) system.

In the Time Division Dual (TDD) LTE system, frequency resources are divided in units of time in units of frames. As shown in FIG. 1 , each radio frame has a length of 10 milliseconds, and each radio frame includes 10 subframes having a length of 1 millisecond, including an uplink subframe, a downlink subframe, and a special subframe. For the ratio of the uplink and downlink subframes, the LTE TDD Release-8 (Rel-8) system defines a total of 7 seed frame configurations. The ratio of the uplink and downlink subframes in each configuration structure is different. The system can be based on the cell. The uplink and downlink traffic is flexibly configured. The specific seven configurations are shown in Table 1, where D is the downlink subframe, U is the uplink subframe, and S is the special subframe. The structure of the S subframe is shown in Figure 2. As an evolution system for TDD LTE that guarantees backward compatibility, the TDD LTE-A system maintains the same frame structure as TDD LTE. It is currently determined that in LTE-A TDD Release-10 (Rel-10), the subframe uplink and downlink configurations 0 and 5 shown in Table 1 do not support relay transmission.

Table 1 Sub-frame uplink and downlink configuration forms in the TDD LTE system Uplink and downlink link Uplink-downlink sub ¹ 1 Sub Subframe number

Configuration 0 1 2 3 4 5 6 7 8 9

0 D s u u U D S U U U

1 D s u u D D S U U D

2 D s u D D D S u D D

3 D s u U U D D D D D

4 D s u U D D D D D D

5 D s u D D D D D D D

6 D s u U U D S U U D

HARQ is an important error control method in packet transmission systems, which can effectively improve transmission reliability. In the LTE/LTE-A system, the uplink HARQ transmission defines a series of transmission timings, including: uplink data transmission and downlink acknowledgement or non-acknowledgement (ACK/NACK) information feedback timing; downlink ACK/NACK feedback and Uplink data retransmission timing, etc.

After the introduction of the relay station in the TDD LTE-A system, the data transmission is one more hop, that is, the original base station-terminal communication mode changes. Taking the two-hop system as an example, the communication mode of the terminal receiving the relay station service becomes the base station-relay station-terminal mode. At this time, it is necessary to separately divide a part of the uplink and downlink resources as the communication resources of the base station-relay station (the corresponding interface is also referred to as the Un interface), that is, a part of the subframes are allocated for the communication of the base station-relay station, and these sub-frames A frame is called a relay subframe (or an Un subframe). For the downlink relay subframe, the relay station indicates that it is an MBSFN subframe to the next Rel-8 terminal, and the Rel-8 terminal does not receive the resources outside the control domain of the MBSFN subframe, thereby ensuring that the relay station performs downlink reception. When it comes to compatibility with Rel-8 terminals. For the uplink relay subframe, the uplink service of the relay station subordinate terminal is not scheduled, and the relay station uplink transmission is avoided, and the relay station subordinate terminal is also transmitting uplink. However, in order to ensure that the configuration of the relay subframe does not affect the data transmission of the terminal of the relay station, and the reliability of the transmission between the base station and the relay station can be ensured, the relay subframe needs to be properly configured and the HARQ transmission timing of the relay link is defined. .

In the related art, the HARQ transmission timing of the base station-relay communication is not yet considered. Section question. Summary of the invention

In view of this, the main object of the present invention is to provide a relay link of a time division duplex system.

The HARQ transmission method and device are used to implement reasonable setting of the HARQ timing of the relay link, and ensure backward compatibility with the terminal.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A relay link HARQ transmission method for a TDD system, the method comprising:

For the uplink and downlink configuration of the subframe supporting the relay transmission in the TDD system, determining the HARQ timing relationship of the relay transmission according to the positions of the uplink relay subframe and the downlink relay subframe in the uplink and downlink configuration of the subframe;

Performing HARQ transmission according to the HARQ timing relationship of the relay transmission.

Further, the method is directed to the uplink and downlink configuration 1 of the subframe in the TDD system, and the HARQ timing relationship of the relay transmission is:

Performing downlink feedback on the downlink uplink data received by the uplink relay subframe n-k in the downlink relay subframe n, where k=6;

If the relay station transmits the uplink data of the relay link in the uplink relay subframe n, the corresponding downlink feedback is received in the downlink relay subframe n+i, where i=6;

If the relay station receives the downlink feedback of the relay link in the downlink relay subframe n, it performs uplink retransmission in the uplink relay subframe n+m, where m=4.

Further, the method is directed to the uplink and downlink configuration 2 of the subframe in the TDD system, and the HARQ timing relationship of the relay transmission is:

If the relay station sends the uplink data of the relay link in the uplink relay subframe n, the corresponding downlink feedback is received in the downlink relay subframe n+i, where i=6; If the relay station receives the downlink feedback of the relay link in the downlink relay subframe n, the uplink retransmission is performed in the uplink relay subframe n+m, where m=4.

Further, the method is directed to the uplink and downlink configuration 3 of the subframe in the TDD system, and the HARQ timing relationship of the relay transmission is:

Further, the method is directed to the uplink and downlink configuration 4 of the subframe in the TDD system, and the HARQ timing relationship of the relay transmission is:

Further, the method is directed to the uplink and downlink configuration of the subframe in the TDD system, and the HARQ timing relationship of the relay transmission is:

Performing downlink feedback on the downlink uplink data received by the uplink relay subframe n-k in the downlink relay subframe n, where k=5;

If the relay station sends the uplink data of the relay link in the uplink relay subframe n, the corresponding downlink feedback is received in the downlink relay subframe n+i, where i=5;

If the downlink link subframe n receives the relay link downlink feedback, the uplink relay subframe n+m enters Line uplink retransmission, where m=5.

Further, the downlink feedback of the uplink data of the relay link is carried by a new data indication (NDI) and/or a relay link HARQ indicator channel (R-PHICH) in an uplink grant (UL grant).

Based on the above method, the present invention also provides a relay link HARQ transmission apparatus for a time division duplex system, the apparatus comprising:

The HARQ timing determining module is configured to determine a HARQ timing relationship of the relay transmission according to the positions of the uplink relay subframe and the downlink relay subframe in the uplink and downlink configuration of the subframe supporting the relay transmission in the TDD system;

And a HARQ transmission module, configured to perform HARQ transmission according to the HARQ timing relationship of the relay transmission determined by the HARQ timing determination module.

For the subframe uplink and downlink configuration 1, 2, 3 or 4 in the TDD system, the HARQ timing relationship determined by the HARQ timing determination module is:

If the relay station receives the downlink feedback of the relay link in the downlink relay subframe n, the uplink retransmission is performed in the uplink relay subframe n+m, where m=4;

For the subframe uplink and downlink configuration in the TDD system, the HARQ timing relationship determined by the HARQ timing determination module is specifically:

The HARQ transmission module carries the downlink feedback information by using an NDI and/or an R-PHICH channel in the UL grant when performing downlink feedback of the uplink data of the relay link.

Through the above HARQ transmission method, the reliability of the relay link data transmission is effectively ensured; the efficiency of the HARQ transmission is ensured; meanwhile, the method of the present invention avoids the impact on the HARQ timing of the relay station subordinate terminal, and ensures the To compatibility. DRAWINGS

1 is a schematic diagram of a radio frame structure of an LTE system;

2 is a schematic diagram of a special subframe structure of a TDD LTE system;

3 is a schematic diagram of a configuration of a relay subframe of an uplink and downlink configuration 1 of a TDD system subframe;

4 is a schematic diagram of a configuration of a relay subframe of an uplink and downlink configuration 2 of a TDD system subframe;

5 is a schematic diagram of a configuration of a relay subframe of an uplink and downlink configuration 3 of a TDD system subframe;

6 is a schematic diagram of a configuration of a relay subframe of an uplink and downlink configuration 4 of a TDD system subframe;

7 is a schematic diagram of a configuration of a relay subframe of an uplink and downlink configuration 6 of a TDD system subframe;

8 is a schematic flowchart of a HARQ transmission method of a relay link of a TDD system according to the present invention; and FIG. 9 is a structural diagram of a HARQ transmission apparatus of a relay link of a time division duplex system according to the present invention. detailed description

The basic idea of the present invention is that the HARQ timing relationship of the relay transmission is determined according to the uplink and downlink configuration of the subframe supported by the TDD system and the configuration of the relay link subframe in the uplink and downlink configuration of the subframe, and the relay is configured. The link subframe configuration determines the uplink relay subframe and the downlink relay subframe of the relay transmission. The invention can effectively ensure the reliability of the data transmission of the relay link and ensure the efficiency of the HARQ transmission; at the same time, the invention can also avoid the influence on the data transmission of the terminal of the relay station and ensure the backward compatibility with the terminal.

In order to make the objects, technical solutions and advantages of the present invention more clear, the following embodiments are The invention will be described in further detail with reference to the accompanying drawings.

In general, the transmission timing of service data transmission and corresponding ACK/NACK feedback information needs to meet the processing delay. That is, after the receiving end receives the service data, it needs sufficient processing time to perform demodulation, decoding, and CRC (Cyclic Redundant Check) to determine whether ACK or NACK information should be fed back to the transmitting end. In LTE, it is generally considered that the feedback delay is at least 4 ms, that is, after the subframe n receives the data, the subframe is generally fed with a subframe that satisfies n+4 or more. Therefore, the HARQ timing of the relay link also needs to follow this principle. On the other hand, the definition of HARQ timing should consider the delay of feedback, that is, the interval between service data transmission and corresponding feedback information transmission should not be too large, which may cause the delay of service transmission to increase, which in turn leads to the transmission of the following terminals of the relay station. The delay is increased.

FIG. 8 is a flowchart of a method for relaying HARQ transmission of a relay link of a time division duplex system according to the present invention, which specifically includes the following steps:

Step 1: For the uplink and downlink configuration of the subframe supporting the relay transmission in the TDD system, determining the HARQ timing relationship of the relay transmission according to the positions of the uplink relay subframe and the downlink relay subframe in the uplink and downlink configuration of the subframe;

The present invention first determines the location that can be used as the uplink and downlink relay subframe according to the uplink and downlink configuration of the subframe in the TDD LTE/LTE-A system, as shown in Table 1. Since it is currently determined that the uplink and downlink configurations 0 and 5 of the sub-frames in Rel-10 do not support relay transmission, the embodiments of the present invention are only described for the remaining configurations. In addition, in the Rel-10 TDD Relay, subframes 0, 1, 5, and 6 are not configured as relay subframes.

After determining the location of the uplink and downlink relay subframes, determining the HARQ timing relationship of the relay transmission according to the requirements of the location of the uplink relay subframe and the downlink relay subframe and the feedback delay and retransmission delay in the LTE system; Following the HARQ timing relationship of the transmission, the description of the feedback and retransmission timing in the configuration of the uplink and downlink configuration 1, 2, 3, 4, and 6 of the subframe is as follows.

Step 2: Perform HARQ transmission according to the HARQ timing relationship of the relay transmission. The method of the present invention will be specifically described below according to the subframe uplink and downlink configuration in the TDD LTE/LTE-A system in Table 1.

Sub-frame uplink and downlink configuration 1

In the uplink and downlink configuration of the subframe 1, only the downlink subframes 4 and 9 can be configured as downlink relay subframes due to the limitation of the MBSFN subframe configuration. If subframes 4 and 9 are configured as downlink relay subframes, subframes 8 and 3 can be configured as uplink relay subframes, and this configuration mode has the least influence on the HARQ timing relationship of the relay station subordinate terminals. The configuration of the relay subframe is shown in Figure 3. It should be emphasized that the relay subframe configuration shown in FIG. 3 is only a preferred configuration to illustrate the relay link HARQ timing problem described in the present invention, and is not the only relay subframe in the uplink and downlink configuration of the subframe. Configuration method.

In the relay subframe configuration shown in FIG. 3, for the uplink traffic transmitted in the uplink relay subframe 3, according to the method of the present invention, the downlink ACK/NACK feedback information can only be in the downlink relay subframe 9 or in the next radio frame. The downlink relay subframe 4 is transmitted. Otherwise, the downlink feedback information of the relay link cannot be correctly received. However, if the downlink relay subframe 4 transmission of the next radio frame will cause the feedback delay to be too large, it is preferable to feed back the downlink relay subframe 9 of the current radio frame. For the uplink service in the uplink relay subframe 8, the downlink feedback can also be transmitted in the relay subframe 4 or 9 of the next radio frame. Considering the feedback delay, it is preferably transmitted in the uplink relay subframe 4 of the next radio frame. For the above-mentioned timing relationship, it is summarized as follows: In the downlink relay subframe n, downlink feedback is performed on the uplink data of the relay link received in the uplink relay subframe nk, where k=6; or: the relay station transmits the uplink relay subframe n. Following the link uplink data, the downlink downlink subframe n+i receives corresponding downlink feedback, where i=6.

Another HARQ timing relationship related to uplink transmission is a timing relationship between downlink feedback information transmission and uplink retransmission. For the uplink and downlink configuration 1 of the subframe, according to the HARQ timing relationship defined above, if the timing relationship between the uplink transmission and the downlink feedback is defined as nk, k=6, the timing relationship of the uplink retransmission can be defined as n+4. That is, in the downlink relay subframe n receiving the relay link Line feedback, uplink retransmission in the uplink relay subframe n+m, m=4. This not only satisfies the data processing delay, but also ensures that the first transmission and retransmission intervals of the uplink HARQ are reasonable.

Sub-frame uplink and downlink configuration 2

In the uplink and downlink configuration 2 of the subframe, the downlink subframes 3, 4, 8, and 9 can be configured as downlink relay subframes. If subframe 3 or 3 and subframe 9 of the previous radio frame are configured as downlink relay subframes, subframe 7 can be configured as an uplink relay subframe, and the effect of this configuration manner on the HARQ timing relationship of the subordinate terminals of the relay station is affected. Similarly, if subframe 8 or subframes 8 and 4 are configured as downlink relay subframes, subframe 2 of the next radio frame may be configured as an uplink relay subframe, in which case the relay subframe configuration is for the relay station. The HARQ timing relationship of the subordinate terminals is less affected. The sub-frames 4 and 8 are configured as downlink relay sub-frames, and the sub-frame 2 is configured as an uplink relay sub-frame as an example to illustrate the method of the present invention, as shown in FIG. It should be emphasized that the relay subframe configuration shown in FIG. 4 is only a preferred configuration to illustrate the relay link HARQ timing problem described in the present invention, and is not the only relay subframe in the uplink and downlink configuration of the subframe. Configuration method.

In the relay subframe configuration shown in FIG. 4, for the uplink traffic transmitted in the uplink relay subframe 2, according to the method of the present invention, the downlink ACK/NACK feedback information can only be in the downlink relay subframe 8 or in the next radio frame. The downlink relay subframe 4 is transmitted. Otherwise, the downlink feedback information of the relay link cannot be correctly received. However, if the transmission at 4 will cause the feedback delay to be too large, it is preferable to feedback at 8. When subframes 3 or 3 and 9 are configured as downlink relay subframes, and subframe 7 is configured as uplink relay subframes, HARQ timing can be similarly obtained. For the above-mentioned timing relationship, it is summarized that downlink feedback is performed on the downlink uplink data received by the uplink relay subframe nk in the downlink relay subframe n, where k=6; or: the relay station transmits the uplink relay subframe n. Following the uplink data of the link, the downlink downlink subframe n+i receives corresponding downlink feedback, where i=6.

Another HARQ timing relationship related to uplink transmission is a timing relationship between downlink feedback information transmission and uplink retransmission. For the uplink and downlink configuration 2 of the subframe, according to the HARQ timing relationship defined above, if the timing relationship between the uplink transmission and the downlink feedback is defined as nk, k=6, then The timing relationship of the uplink retransmission is defined as n+4, that is, the relay link downlink feedback is received in the downlink relay subframe n, and the uplink retransmission is performed in the uplink relay subframe n+m, where m=4. This not only satisfies the data processing delay, but also ensures that the first transmission and retransmission intervals of the uplink HARQ are reasonable.

Sub-frame uplink and downlink configuration 3

In the uplink and downlink configuration of the subframe 3, the downlink subframes 7, 8, and 9 can be configured as downlink relay subframes. If subframes 7, 8 and 9 are configured as downlink relay subframes, subframes 2 and 3 can be configured as uplink relay subframes, and this configuration mode has the least influence on the HARQ timing relationship of the relay station subordinate terminals. Assume that the relay subframe configuration is as shown in Figure 5. It should be emphasized that the relay subframe configuration shown in FIG. 5 is only a preferred configuration to illustrate the relay link HARQ timing problem described in the present invention, and is not the only relay subframe in the uplink and downlink configuration of the subframe. Configuration method.

In the relay subframe configuration shown in FIG. 5, for the uplink traffic transmitted in the uplink relay subframes 2 and 3, according to the method of the present invention, the downlink ACK/NACK feedback information can only be transmitted in the downlink relay subframe 8 or 9. Otherwise, the downlink feedback information of the relay link cannot be received correctly. For example, the downlink feedback information of the uplink service in the subframes 2 and 3 may be transmitted in the subframe 8 or the subframe 9, or may be transmitted in the subframes 8 and 9, respectively. Preferably, the feedback information of the uplink services of the subframes 2 and 3 is separately transmitted in different subframes, for example, the downlink feedback information of the uplink transmission of the subframe 2 is transmitted in the subframe 8, and the feedback information of the uplink service of the subframe 3 is transmitted in the subframe 9. . For the above-mentioned timing relationship, it is summarized that downlink feedback is performed on the downlink uplink data received by the uplink relay subframe nk in the downlink relay subframe n, where k=6; or: the relay station transmits the uplink relay subframe n. Following the uplink data of the link, the downlink downlink subframe n+i receives corresponding downlink feedback, where i=6.

Another HARQ timing relationship related to uplink transmission is a timing relationship between downlink feedback information transmission and uplink retransmission. For the uplink and downlink configuration 3 of the subframe, according to the HARQ timing relationship defined above, if the timing relationship between the uplink transmission and the downlink feedback is defined as nk, k=6, the timing relationship of the uplink retransmission can be defined as n+4. That is, in the downlink relay subframe n receiving the relay link Line feedback, uplink retransmission in the uplink relay subframe n+m, m=4. This not only satisfies the data processing delay, but also ensures that the first transmission and retransmission intervals of the uplink HARQ are reasonable.

Sub-frame uplink and downlink configuration 4

In the uplink and downlink configuration of the subframe 4, the downlink subframes 4, 7, 8, and 9 may be configured as downlink relay subframes, and the subframes 2 and 3 may be configured as uplink relay subframes. Assume that the relay subframe configuration is as shown in Figure 6. It should be emphasized that the relay subframe configuration shown in FIG. 6 is only a preferred configuration to illustrate the relay link HARQ timing problem described in the present invention, and is not the only relay subframe in the uplink and downlink configuration of the subframe. Configuration method.

In the relay subframe configuration shown in FIG. 6, for the uplink traffic transmitted in the uplink relay subframe 3, according to the method of the present invention, the downlink ACK/NACK feedback information can only be transmitted in the downlink relay subframe 7 or 9, otherwise The downlink feedback information of the relay link cannot be received correctly. For example, the downlink feedback information of the uplink transmission of the limited subframe 3 is transmitted in the subframe 9. If subframes 2 and 8 are also configured as relay subframes, the downlink ACK/NACK feedback information of the uplink transmission of subframe 2 can be limited to be transmitted in subframe 8. For the above-mentioned timing relationship, it is summarized as follows: In the downlink relay subframe n, downlink feedback is performed on the uplink data of the relay link received in the uplink relay subframe nk, where k=6; or: the relay station transmits the uplink relay subframe n. Following the link uplink data, the downlink downlink subframe n+i receives corresponding downlink feedback, where i=6.

Another HARQ timing relationship related to uplink transmission is a timing relationship between downlink feedback information transmission and uplink retransmission. For the uplink and downlink configuration 4 of the subframe, according to the HARQ timing relationship defined above, if the timing relationship between the uplink transmission and the downlink feedback is defined as nk, k=6, then the timing relationship of the uplink retransmission is defined as n+4, that is, The downlink relay subframe n receives the downlink feedback of the relay link, and performs uplink retransmission in the uplink relay subframe n+m, where m=4. This not only satisfies the data processing delay, but also ensures that the first transmission and retransmission intervals of the uplink HARQ are reasonable.

Sub-frame uplink and downlink configuration 6

In the uplink and downlink configuration of the subframe 6, only the downlink subframe 9 can be configured as a downlink relay subframe. If 9 is configured as a downlink relay subframe, subframe 4 can be configured as an uplink relay subframe. This configuration mode has less influence on the HARQ timing relationship of the relay terminal. Assume that the relay subframe configuration is as shown in FIG. 7. It should be emphasized that the relay subframe configuration shown in FIG. 7 is only a preferred configuration to illustrate the relay link HARQ timing problem described in the present invention, and is not the only relay subframe in the uplink and downlink configuration of the subframe. Configuration method.

In the relay subframe configuration shown in FIG. 7, for the uplink traffic transmitted in the uplink relay subframe 4, according to the method of the present invention, the downlink ACK/NACK feedback information can only be transmitted in the downlink relay subframe 9, otherwise it will result in The downlink feedback information of the link cannot be received correctly. For the above timing relationship, it is summarized as follows: In the downlink relay subframe n, downlink feedback is performed on the uplink data of the relay link received in the uplink relay subframe nk, where k=5; or: the relay station transmits the relay in the uplink relay subframe n. Link uplink data, receiving corresponding downlink feedback in the downlink relay subframe n+i, where i=5.

Another HARQ timing relationship related to uplink transmission is a timing relationship between downlink feedback information transmission and uplink retransmission. For the uplink and downlink configuration 6 of the subframe, according to the HARQ timing relationship defined above, if the timing relationship between the uplink transmission and the downlink feedback is defined as nk, k=5, then the timing relationship of the uplink retransmission is defined as n+5, that is, The downlink relay subframe n receives the downlink feedback of the relay link, and performs uplink retransmission in the uplink relay subframe n+m, where m=5. This not only satisfies the data processing delay, but also ensures that the first transmission and retransmission intervals of the uplink HARQ are reasonable.

The downlink ACK/NACK feedback information of the relay link can be indicated by NDI (New Data Indication) in the relay link uplink grant (UL grant). If the UL grant schedules uplink transmission of one codeword stream, the NDI in the UL grant is 1 bit, and may take values of 0 and 1. If the UL grant schedules uplink transmission of 2 codeword streams, then the NDI in the UL grant is 2 bits, each 1 bit corresponds to 1 codeword stream, and can take 0 and 1 values. If the NDI is used for indication, the NDI does not directly indicate the ACK or NACK information, but indicates whether the 1 codeword stream scheduled for uplink is a retransmission or a first transmission by 1 bit. If the retransmission is scheduled, it means the last transmission error (NACK), otherwise it means the last transmission is correct (ACK). Specific NDI It is the same as the NDI in the UL grant sent to the terminal, and will not be described here. The downlink feedback of the relay link may also be sent through the HARQ indication of the relay link,

The HARQ indication is normally carried on the relay link HARQ indicator channel (Relay-Physical)

HARQ Indicator Channel, R-PHICH). The PHICH channel of the relay link can be used in the same manner as the PHICH transmitted to the terminal, and is not described here.

FIG. 9 is a structural diagram of a relay link HARQ transmission apparatus for a time division duplex system according to the present invention. The apparatus is used to implement a relay link HARQ transmission method of a time division duplex system according to the present invention, and the apparatus includes: HARQ timing determination module, HARQ transmission module;

Since the uplink and downlink configurations 0 and 5 of the sub-frames in Rel-10 are currently determined to not support the relay transmission, the embodiment of the present invention only describes the uplink and downlink configuration 1, 2, 3, 4, and 6 of the subframe. The HARQ timing determining module determines the HARQ timing relationship of the relay transmission according to the location of the uplink relay subframe and the downlink relay subframe and the requirements of the feedback delay and the retransmission delay in the LTE system; the specific HARQ of the relay transmission For the timing relationship, see the previous descriptions of the uplink and downlink configurations 1, 2, 3, 4, and 6 of the subframe, and details are not described here.

And the HARQ transmission module is configured to perform HARQ transmission according to the HARQ timing relationship of the relay transmission determined by the HARQ timing determination module. The HARQ transmission module carries the downlink feedback information by using an NDI and/or an R-PHICH channel in the UL grant when performing downlink feedback of the uplink data of the relay link.

In summary, the relay link HARQ transmission method and apparatus described in the present invention effectively ensure the reliability of the relay link data transmission, ensure the efficiency of the HARQ transmission, and avoid the influence on the HARQ timing of the relay terminal subordinate terminal. , to ensure backward compatibility for the terminal.

The above are only the preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

Claims

Claim

A time-multiplexed TDD system relay link hybrid automatic repeat request HARQ transmission method, characterized in that the method comprises:

2. The method according to claim 1, wherein, for the subframes in the TDD system, the HARQ timing relationship is:

3. The method according to claim 1, wherein, for the subframes in the TDD system, the HARQ timing relationship is:

4. The method according to claim 1, wherein: for a sub-frame in a TDD system Line configuration 3, the HARQ timing relationship of the relay transmission is:

Performing downlink feedback on the downlink uplink data received by the uplink relay subframe n-k in the downlink relay subframe η, where k=6;

The method according to claim 1, wherein, for the subframes in the TDD system, the HARQ timing relationship is:

6. The method according to claim 1, wherein, for the subframes in the TDD system, the HARQ timing relationship of the relay transmission is:

If the relay link downlink feedback is received in the downlink relay subframe n, uplink retransmission is performed in the uplink relay subframe n+m, where m=5.

7. The method according to any one of claims 2 to 6, wherein

The downlink feedback of the uplink data of the relay link passes the new data in the uplink grant UL grant. Indicates that the NDI and/or relay link HARQ indicates the channel R-PHICH bearer.

8. A relay link HARQ transmission apparatus for a time division duplex system, the apparatus comprising:

9. The apparatus according to claim 8, wherein

For the subframe uplink and downlink configuration in the TDD system, the HARQ timing relationship determined by the HARQ timing determination module is:

The device according to claim 8 or 9, wherein the HARQ transmission module performs the downlink feedback of the uplink data of the relay link by using the NDI and/or the R-PHICH channel 7 in the UL grant. Downstream feedback information.