CN102377550B - The repeated link HARQ transmission method of a kind of tdd systems and device - Google Patents
The repeated link HARQ transmission method of a kind of tdd systems and device Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0097—Relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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Abstract
The invention discloses the repeated link HARQ transmission method of a kind of tdd systems and device, for rationally arranging repeated link HARQ sequential, and ensure that the backwards compatibility for terminal. The HARQ sequential relationship of relay transmission of the present invention is determined according to the repeated link sub-frame configuration under the subframe uplink-downlink configuration supported in TDD system and described subframe uplink-downlink configuration, and described repeated link sub-frame configuration determines uplink relay subframe and the downlink relay sub-frame of relay transmission. The present invention can be effectively ensured the reliability of repeated link data transmission, ensure the efficiency of HARQ transmission; Meanwhile, the present invention can also avoid the impact transmitted for the data of relay station subordinate terminal, it is ensured that for the backwards compatibility of terminal.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for HARQ transmission of a relay link in a tdd system.
Background
The development of mobile communication requires the support of higher transmission rates, more sophisticated signal coverage and higher resource utilization. Relay (Relay) technology can increase coverage and balance, increase cell throughput, and a Relay station has a relatively small configuration cost compared to a base station, so Relay is considered as a key technology in an evolution system of Long Term Evolution (LTE), namely, an Advanced long term evolution (LTE-Advanced) system.
In the LTE system of Time Division Duplex (TDD), frequency resources are divided in time by frame units. As shown in fig. 1, each radio frame has a length of 10 ms, and each radio frame includes 10 subframes having a length of 1 ms, which respectively include an uplink subframe, a downlink subframe, and a special subframe. Aiming at different proportions of uplink and downlink subframes, a 7-subframe configuration structure is defined in an LTETDDRelease-8 (Rel-8 for short) system, the proportions of the uplink and downlink subframes in each configuration structure are different, and the system can flexibly configure according to the uplink and downlink traffic in a cell. Specific 7 configurations are shown in table 1, where D denotes a downlink subframe, U denotes an uplink subframe, S denotes a special subframe, and the structure of the S subframe is shown in fig. 2. As an evolution system of TDDLTE ensuring backward compatibility, the TDDLTE-a system may maintain the same frame structure as TDDLTE. Currently, it is determined that in LTE-ATDDRelease-10 (Rel-10 for short), relay transmission is not supported by the uplink and downlink configurations 0 and 5 of the subframe shown in table 1.
TABLE 1 uplink and downlink configuration form of sub-frame in TDDLTE system
HARQ (Hybrid-automatic repeat request) is an important error control method in a packet transmission system, and can effectively improve transmission reliability. In the LTE/LTE-a system, uplink HARQ transmission defines a series of transmission timings, including: uplink data transmission and downlink acknowledgement or non-acknowledgement (ACK/NACK) information feedback time sequence; downlink ACK/NACK feedback, uplink data retransmission time sequence and the like.
After the relay station is introduced into the TDDLTE-a system, the data transmission is equivalent to one more hop, that is, the original base station-terminal communication mode is changed. Taking the two-hop system as an example, the communication mode of the terminal served by the relay station is changed to the base station-relay station-terminal mode. At this time, it is necessary to divide a part of uplink and downlink resources into uplink and downlink resources (corresponding interfaces are also referred to as Un interfaces) for the base station-relay station, i.e. to divide a part of subframes for the base station-relay station communication, and these subframes are referred to as relay subframes (or Un subframes). For a downlink relay subframe, the relay station indicates that the relay station is the MBSFN subframe to a subordinate Rel-8 terminal, and the Rel-8 terminal does not receive in resources outside a control domain of the MBSFN subframe, so that the compatibility of the relay station for the Rel-8 terminal is ensured when the downlink relay station receives downlink. For the uplink relay subframe, uplink services of subordinate terminals are not scheduled, so that the relay station is prevented from transmitting uplink while the relay station also transmits uplink by the subordinate terminals. However, in order to ensure reliability of transmission between the base station and the relay station without affecting data transmission of the terminal under the relay station, it is necessary to define HARQ transmission timing of the relay link.
In the related art, the detailed problem of the HARQ transmission timing of the base station-relay station communication has not been considered at present.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method and an apparatus for transmitting a relay link HARQ in a tdd system, which can reasonably set a HARQ timing of the relay link and ensure backward compatibility for a terminal.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a relay link HARQ transmission method of a TDD system includes:
for the uplink and downlink configuration of a subframe supporting relay transmission in a TDD system, determining the HARQ timing relationship of relay transmission according to the positions of an uplink relay subframe and a downlink relay subframe under the uplink and downlink configuration of the subframe;
and carrying out HARQ transmission according to the HARQ time sequence relation of the relay transmission.
Further, the method configures 1 for uplink and downlink of a subframe in a TDD system, and the HARQ timing relationship of relay transmission specifically is as follows:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
Further, the method configures 2 for uplink and downlink of a subframe in a TDD system, and the HARQ timing relationship of relay transmission specifically is as follows:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
Further, the method configures 3 for uplink and downlink of a subframe in a TDD system, where the HARQ timing relationship of relay transmission specifically is as follows:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
Further, the method configures 4 for uplink and downlink of a subframe in a TDD system, and the HARQ timing relationship of relay transmission specifically is as follows:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
Further, the method configures 6 for uplink and downlink of a subframe in a TDD system, where the HARQ timing relationship of relay transmission specifically is as follows:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 5;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 5;
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 is 5.
Further, the downlink feedback of the relay link uplink data is carried by a New Data Indication (NDI) and/or a relay link HARQ indication channel (R-PHICH) in an uplink grant (ULgrant).
Based on the above method, the present invention further provides a relay link HARQ transmission apparatus of a tdd system, the apparatus comprising:
the HARQ time sequence determining module is used for determining the HARQ time sequence relation of relay transmission according to the positions of an uplink relay subframe and a downlink relay subframe under uplink and downlink configuration of a subframe supporting the relay transmission in the TDD system;
and the HARQ transmission module is used for carrying out HARQ transmission according to the HARQ time sequence relation of the relay transmission determined by the HARQ time sequence determination module.
For uplink and downlink configuration 1, 2, 3, or 4 of a subframe in a TDD system, the HARQ timing relationship of relay transmission determined by the HARQ timing determination module specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
if the relay station receives the relay link downlink feedback in a downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4;
for uplink and downlink configuration 6 of a subframe in a TDD system, the HARQ timing relationship of the relay transmission determined by the HARQ timing determining module specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 5;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 5;
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 is 5.
And when the HARQ transmission module carries out downlink feedback of uplink data of a relay link, the downlink feedback information is carried through an NDI (non-hybrid indicator) and/or an R-PHICH (physical hybrid indicator channel) in the ULgrant.
By the HARQ transmission method, the reliability of relay link data transmission is effectively ensured; the efficiency of HARQ transmission is ensured; meanwhile, the method avoids the influence on the HARQ time sequence of the subordinate terminal of the relay station and ensures the backward compatibility of the terminal.
Drawings
Fig. 1 is a schematic diagram of a radio frame structure of an LTE system;
FIG. 2 is a diagram of a special subframe structure of a TDDLTE system;
fig. 3 is a schematic diagram of a relay subframe configuration of a TDD system subframe uplink and downlink configuration 1;
fig. 4 is a relay subframe configuration diagram of a TDD system subframe uplink and downlink configuration 2;
fig. 5 is a schematic diagram of a relay subframe configuration of a TDD system subframe uplink and downlink configuration 3;
fig. 6 is a relay subframe configuration diagram of TDD system subframe uplink and downlink configuration 4;
fig. 7 is a relay subframe configuration diagram of a TDD system subframe uplink and downlink configuration 6;
fig. 8 is a flowchart illustrating a relay link HARQ transmission method of a TDD system according to the present invention;
fig. 9 is a block diagram of a relay link HARQ transmission apparatus of a tdd system according to the present invention.
Detailed Description
The basic idea of the invention is: the HARQ time sequence relation of relay transmission is determined according to subframe uplink and downlink configuration supported in a TDD system and relay link subframe configuration under the subframe uplink and downlink configuration, and the relay link subframe configuration determines an uplink relay subframe and a downlink relay subframe of relay transmission. The invention can effectively ensure the reliability of relay link data transmission and the efficiency of HARQ transmission; meanwhile, the invention can also avoid the influence on the data transmission of the subordinate terminal of the relay station and ensure the backward compatibility of the terminal.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
Generally, the transmission timing of the service data transmission and the corresponding ACK/NACK feedback information needs to meet the processing delay. That is, after receiving the service data, the receiving end needs enough processing time to perform demodulation, decoding, and CRC (cyclic redundancy check) operations, so as to determine that ACK or NACK information should be fed back to the transmitting end. In LTE, it is generally considered that this feedback delay is 4ms at the minimum, that is, after receiving data in subframe n, feedback is generally performed in a subframe where the subframe position satisfies n +4 or more. Therefore, the relay link HARQ timing also needs to follow this principle. On the other hand, the HARQ timing should be defined in consideration of the feedback delay, that is, the interval between the service data transmission and the corresponding feedback information transmission should not be too large, which may result in an increase in the delay of the service transmission, and in turn, an increase in the transmission delay of the terminal, which will be described below, of the relay station.
Fig. 8 is a flowchart of a relay link HARQ transmission method 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 a subframe supporting relay transmission in a TDD system, determining the HARQ timing relationship of relay transmission according to the positions of an uplink relay subframe and a downlink relay subframe under the uplink and downlink configuration of the subframe;
according to the uplink and downlink configuration of the subframe in the TDDLTE/LTE-A system, the position which can be used as an uplink and downlink relay subframe is determined as shown in the table 1. Since it is determined that uplink and downlink configurations 0 and 5 of a subframe do not support relay transmission in Rel-10, the embodiment of the present invention is described only with respect to the remaining configurations. In addition, in Rel-10TDDRelay, subframes 0, 1, 5, 6 are not configured as relay subframes.
After the positions of the uplink relay subframe and the downlink relay subframe are determined, determining the HARQ time sequence relation of relay transmission according to the positions of the uplink relay subframe and the downlink relay subframe and the requirements for feedback delay and retransmission delay in an LTE system; the specific HARQ timing relationship of relay transmission is described in the following description of feedback and retransmission timing under the configuration of uplink and downlink of subframes 1, 2, 3, 4, and 6.
And 2, carrying out HARQ transmission according to the HARQ time sequence relation of the relay transmission.
The method of the present invention is specifically described below according to the uplink and downlink configuration of the subframe in the TDDLTE/LTE-a system in table 1.
Subframe uplink and downlink configuration 1
Under the subframe uplink and downlink configuration 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 may be configured as uplink relay subframes, and this configuration has the least impact on the HARQ timing relationship of the terminals under the relay station. The relay subframe configuration case is shown in fig. 3. It should be emphasized that the relay subframe configuration shown in fig. 3 is only used as a preferred configuration to illustrate the HARQ timing problem of the relay link described in the present invention, and is not the only relay subframe configuration manner in the uplink and downlink configuration of the subframe.
Under the relay subframe configuration shown in fig. 3, for the uplink service 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 9 or in the downlink relay subframe 4 of the next radio frame, 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 perform feedback in 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, and considering the feedback delay, the downlink feedback is preferably transmitted in the uplink relay subframe 4 of the next radio frame. For the above timing relationships, in summary, it is: downlink feedback is carried out on relay link uplink data received in an uplink relay subframe n-k in a downlink relay subframe n, wherein k is 6; or: and the relay station transmits relay link uplink data in an uplink relay subframe n, and receives corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6.
Another HARQ timing relationship associated with uplink transmission is the timing relationship of downlink feedback information transmission and uplink retransmission. For subframe uplink and downlink configuration 1, according to the HARQ timing relationship defined above, if the timing relationship between uplink transmission and downlink feedback is defined as n-k, where k is 6, the timing relationship of uplink retransmission may be defined as n +4, that is, the relay link downlink feedback is received in the downlink relay subframe n, and uplink retransmission is performed in the uplink relay subframe n + m, where m is 4. Therefore, the data processing time delay is met, and the first transmission and retransmission intervals of the uplink HARQ are reasonable.
Subframe uplink and downlink configuration 2
In subframe uplink and downlink configuration 2, downlink subframes 3, 4, 8, and 9 may be configured as downlink relay subframes. If the subframe 3 or 3 and the subframe 9 of the previous radio frame are configured as downlink relay subframes, the subframe 7 can be configured as uplink relay subframes, and the configuration mode has the minimum influence on the HARQ timing relationship of the terminals under the relay station; likewise, 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 uplink relay subframes, in which case the relay subframe configuration has less impact on the HARQ timing relationship of the relay station subordinate terminals. The method of the present invention is described by taking subframes 4 and 8 as downlink relay subframes and subframe 2 as uplink relay subframes, as shown in fig. 4. It should be emphasized that the relay subframe configuration shown in fig. 4 is only used as a preferred configuration to illustrate the HARQ timing problem of the relay link described in the present invention, and is not the only relay subframe configuration manner in the uplink and downlink configuration of the subframe.
Under the relay subframe configuration shown in fig. 4, for the uplink service transmitted in the uplink relay subframe 2, 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 in the downlink relay subframe 4 of the next radio frame, otherwise, the downlink feedback information of the relay link cannot be correctly received. But if transmission at 4 would result in too much feedback delay, it is therefore preferable to feedback at 8. HARQ timing may be similarly obtained when subframe 3 or 3 and 9 is configured as a downlink relay subframe and subframe 7 is configured as an uplink relay subframe. For the above timing relationships, in summary, it is: downlink feedback is carried out on relay link uplink data received in an uplink relay subframe n-k in a downlink relay subframe n, wherein k is 6; or: and the relay station transmits relay link uplink data in an uplink relay subframe n, and receives corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6.
Another HARQ timing relationship associated with uplink transmission is the timing relationship of downlink feedback information transmission and uplink retransmission. For subframe uplink and downlink configuration 2, according to the HARQ timing relationship defined above, if the timing relationship between uplink transmission and downlink feedback is defined as n-k, where k is 6, the timing relationship of uplink retransmission may be defined as n +4, that is, the relay link downlink feedback is received in downlink relay subframe n, and uplink retransmission is performed in uplink relay subframe n + m, where m is 4. Therefore, the data processing time delay is met, and the first transmission and retransmission intervals of the uplink HARQ are reasonable.
Subframe uplink and downlink configuration 3
In subframe uplink and downlink configuration 3, downlink subframes 7, 8, and 9 may be configured as downlink relay subframes. If subframes 7, 8, and 9 are configured as downlink relay subframes, subframes 2 and 3 may be configured as uplink relay subframes, which have the least impact on the HARQ timing relationship of the terminals under the relay station. Assume a relay subframe configuration case as shown in fig. 5. It should be emphasized that the relay subframe configuration shown in fig. 5 is only used as a preferred configuration to illustrate the HARQ timing problem of the relay link described in the present invention, and is not the only relay subframe configuration manner in the uplink and downlink configuration of the subframe.
Under the relay subframe configuration shown in fig. 5, for uplink services transmitted in uplink relay subframes 2 and 3, according to the method of the present invention, downlink ACK/NACK feedback information can only be transmitted in downlink relay subframe 8 or 9, otherwise downlink feedback information of a relay link cannot be correctly received. For example, the downlink feedback information of the uplink service in subframes 2 and 3 may be transmitted in subframe 8 or subframe 9, or may be transmitted in subframes 8 and 9, respectively. Preferably, the feedback information of the uplink service in the subframes 2 and 3 is separately transmitted in different subframes, for example, the downlink feedback information of the uplink transmission in the subframe 2 is transmitted in the subframe 8, and the feedback information of the uplink service in the subframe 3 is transmitted in the subframe 9. For the above timing relationships, in summary, it is: downlink feedback is carried out on relay link uplink data received in an uplink relay subframe n-k in a downlink relay subframe n, wherein k is 6; or: and the relay station transmits relay link uplink data in an uplink relay subframe n, and receives corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6.
Another HARQ timing relationship associated with uplink transmission is the timing relationship of downlink feedback information transmission and uplink retransmission. For subframe uplink and downlink configuration 3, according to the HARQ timing relationship defined above, if the timing relationship between uplink transmission and downlink feedback is defined as n-k, where k is 6, the timing relationship of uplink retransmission may be defined as n +4, that is, the relay link downlink feedback is received in downlink relay subframe n, and uplink retransmission is performed in uplink relay subframe n + m, where m is 4. Therefore, the data processing time delay is met, and the first transmission and retransmission intervals of the uplink HARQ are reasonable.
Subframe uplink and downlink configuration 4
In subframe uplink and downlink configuration 4, downlink subframes 4, 7, 8, and 9 may be configured as downlink relay subframes, and subframes 2 and 3 may be configured as uplink relay subframes. Assume a relay subframe configuration case as shown in fig. 6. It should be emphasized that the relay subframe configuration shown in fig. 6 is only used as a preferred configuration to illustrate the HARQ timing problem of the relay link described in the present invention, and is not the only relay subframe configuration manner in the uplink and downlink configuration of the subframe.
Under the relay subframe configuration shown in fig. 6, for the uplink service 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 correctly received. For example, downlink feedback information defining uplink transmission in subframe 3 is transmitted in subframe 9. If subframes 2 and 8 are also configured as relay subframes, it may be defined that downlink ACK/NACK feedback information for uplink transmission in subframe 2 is transmitted in subframe 8. For the above timing relationships, in summary, it is: downlink feedback is carried out on relay link uplink data received in an uplink relay subframe n-k in a downlink relay subframe n, wherein k is 6; or: and the relay station transmits relay link uplink data in an uplink relay subframe n, and receives corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6.
Another HARQ timing relationship associated with uplink transmission is the timing relationship of downlink feedback information transmission and uplink retransmission. For the subframe uplink and downlink configuration 4, according to the HARQ timing relationship defined above, if the timing relationship between uplink transmission and downlink feedback is defined as n-k, where k is 6, the timing relationship for uplink retransmission is defined as n +4, that is, the relay link downlink feedback is received in the downlink relay subframe n, and uplink retransmission is performed in the uplink relay subframe n + m, where m is 4. Therefore, the data processing time delay is met, and the first transmission and retransmission intervals of the uplink HARQ are reasonable.
Subframe uplink and downlink configuration 6
Under the subframe uplink and downlink configuration 6, only the downlink subframe 9 can be configured as a downlink relay subframe. If 9 is configured as a downlink relay subframe, then subframe 4 may be configured as an uplink relay subframe, and this configuration has less influence on the HARQ timing relationship of the terminal under the relay station. Assume a relay subframe configuration case 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 HARQ timing problem of the relay link described in the present invention, and is not the only relay subframe configuration manner in the uplink and downlink configuration of the subframe.
Under the relay subframe configuration shown in fig. 7, for the uplink service 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, the downlink feedback information of the relay link cannot be correctly received. For the above timing relationships, in summary, it is: downlink feedback is carried out on relay link uplink data received in an uplink relay subframe n-k in a downlink relay subframe n, wherein k is 5; or: and the relay station transmits relay link uplink data in an uplink relay subframe n, and receives corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 5.
Another HARQ timing relationship associated with uplink transmission is the timing relationship of downlink feedback information transmission and uplink retransmission. For the subframe uplink and downlink configuration 6, according to the HARQ timing relationship defined above, if the timing relationship between uplink transmission and downlink feedback is defined as n-k, where k is 5, then the timing relationship for uplink retransmission is defined as n +5, that is, the relay link downlink feedback is received in the downlink relay subframe n, and uplink retransmission is performed in the uplink relay subframe n + m, where m is 5. Therefore, the data processing time delay is met, and the first transmission and retransmission intervals of the uplink HARQ are reasonable.
The relay link downlink ACK/NACK feedback information may be indicated by NDI (new data indication) in a relay link uplink grant (ul grant). If the ul grant schedules 1 codeword stream for uplink transmission, the NDI in the ul grant is 1 bit, and may take values of 0 and 1; if the ul grant schedules 2 codeword streams for uplink transmission, the NDI in the ul grant is 2 bits, and each 1 bit corresponds to 1 codeword stream, which can take values of 0 and 1. If NDI is used for indication, NDI does not directly indicate ACK or NACK information, but indicates whether 1 codeword stream scheduled uplink is retransmitted or first transmitted by 1 bit. If a retransmission is scheduled, it indicates the last transmission was erroneous (NACK), otherwise it indicates the last transmission was correct (ACK). The specific NDI is used the same as the NDI in the ULgrant sent to the terminal, and is not described herein again.
The Relay link downlink feedback may also be sent through a HARQ indication of the Relay link, where the HARQ indication is generally carried on a Relay-physical HARQ indicator channel (R-PHICH). The PHICH channel of the relay link may use the same processing method as the PHICH channel transmitted to the terminal, and is not described herein again.
Fig. 9 is a structural diagram of a relay link HARQ transmission apparatus of a tdd system according to the present invention, where the apparatus is configured to implement the relay link HARQ transmission method of the tdd system according to the present invention, and the apparatus includes: an HARQ time sequence determining module and an HARQ transmission module;
the HARQ time sequence determining module is used for determining the HARQ time sequence relation of relay transmission according to the positions of an uplink relay subframe and a downlink relay subframe under uplink and downlink configuration of a subframe supporting relay transmission in a TDD system;
since it is determined that uplink and downlink configurations 0 and 5 of subframes in Rel-10 do not support relay transmission at present, the embodiments of the present invention only describe uplink and downlink configurations 1, 2, 3, 4, and 6 of subframes. The HARQ time sequence determining module determines the HARQ time sequence relation of relay transmission according to the positions of the uplink relay subframe and the downlink relay subframe and the requirements for feedback time delay and retransmission time delay in the LTE system; the specific HARQ timing relationship of relay transmission is described in the foregoing description for uplink and downlink configurations 1, 2, 3, 4, and 6 of the subframe, and is not described herein again.
The HARQ transmission module is used for carrying out HARQ transmission according to the HARQ time sequence relation of the relay transmission determined by the HARQ time sequence determination module. And when the HARQ transmission module carries out downlink feedback of uplink data of a relay link, the downlink feedback information is carried through an NDI (non-hybrid indicator) and/or an R-PHICH (physical hybrid indicator channel) in the ULgrant.
In summary, the relay link HARQ transmission method and apparatus described in the present invention effectively ensure the reliability of relay link data transmission, ensure the efficiency of HARQ transmission, avoid the impact on the HARQ timing of the relay station subordinate terminal, and ensure the backward compatibility of the terminal.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. A relay link hybrid automatic repeat request (HARQ) transmission method for a Time Division Duplex (TDD) system, the method comprising:
for the uplink and downlink configuration of a subframe supporting relay transmission in a TDD system, determining the HARQ timing relationship of relay transmission according to the positions of an uplink relay subframe and a downlink relay subframe under the uplink and downlink configuration of the subframe;
carrying out HARQ transmission according to the HARQ time sequence relation of the relay transmission; wherein,
for the uplink and downlink configuration 6 of the subframe in the TDD system, the HARQ timing relationship of the relay transmission specifically is as follows:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 5;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 5;
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 is 5.
2. The method according to claim 1, wherein for uplink and downlink configuration 1 of a subframe in a TDD system, the HARQ timing relationship of the relay transmission specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
3. The method according to claim 1, wherein for uplink and downlink configuration 2 of a subframe in a TDD system, the HARQ timing relationship of the relay transmission specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
4. The method according to claim 1, wherein for uplink and downlink configuration 3 of a subframe in a TDD system, the HARQ timing relationship of the relay transmission specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
5. The method according to claim 1, wherein for uplink and downlink configuration 4 of a subframe in a TDD system, the HARQ timing relationship of the relay transmission specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
6. The method according to any one of claims 2 to 5,
the downlink feedback of the relay link uplink data is carried through a New Data Indicator (NDI) in an uplink grant (ULgrant) and/or a relay link HARQ indicator channel (R-PHICH).
7. A relay link HARQ transmission apparatus of a time division duplex TDD system, the apparatus comprising:
the HARQ time sequence determining module is used for determining the HARQ time sequence relation of relay transmission according to the positions of an uplink relay subframe and a downlink relay subframe under uplink and downlink configuration of a subframe supporting the relay transmission in the TDD system;
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; wherein,
for uplink and downlink configuration 6 of a subframe in a TDD system, the HARQ timing relationship of the relay transmission determined by the HARQ timing determining module specifically is:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 5;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 5;
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 is 5.
8. The apparatus according to claim 7, wherein for uplink and downlink configurations 1, 2, 3, or 4 of subframes in a TDD system, the HARQ timing relationship of the relay transmission determined by the HARQ timing determining module is specifically:
performing downlink feedback on relay link uplink data received in the uplink relay subframe n-k at a downlink relay subframe n, wherein k is 6;
if the relay station sends relay link uplink data in an uplink relay subframe n, receiving corresponding downlink feedback in a downlink relay subframe n + i, wherein i is 6;
and if the relay station receives the relay link downlink feedback in the downlink relay subframe n, performing uplink retransmission in an uplink relay subframe n + m, wherein m is 4.
9. The apparatus according to claim 7 or 8,
and when the HARQ transmission module carries out downlink feedback of uplink data of a relay link, the downlink feedback information is carried by a new data indication NDI and/or an indication channel R-PHICH in an uplink grant ULgrant.
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| PCT/CN2011/076441 WO2012019494A1 (en) | 2010-08-13 | 2011-06-27 | Relay link hybrid automatic repeat request (harq) transmission method and apparatus in a time division dual system |
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