WO2011020234A1 - Method and apparatus for controlling data retransmission in wireless relay network - Google Patents

Abstract

To solve the problem of backward compatibility with regulated HARQ (Hybrid Automatic Repeat Request) transmission timeline of uplink data in wireless relay network after the introduction of relay device, a method and apparatus for controlling data retransmission in wireless relay network are provided in the present invention. The method includes that: before an acknowledgement indicator for the uplink data is feedbacked to a user device during a preset time unit, whether the user device is needed to retransmit the uplink data is determined: when it can't be determined, a first indicator is transmitted to the user device during the preset time unit, in which the first indicator indicates the user device to save but not to retransmit the uplink data, then to wait for a base station to send scheduling indication information; when whether the user device is needed to retransmit the uplink data has been determined, the scheduling indication information is generated and transmitted to the user device, in which the scheduling indication information indicates the user device to retransmit the uplink data to the relay station, or to transmit other new uplink data. The embodiment of the present invention maintains HARQ transmission timeline of the preset uplink data, and controls the user device to retransmit data or perform new transmission with less signaling overhead.

Description

 In a wireless relay network

 Method and device for controlling data retransmission

 The present invention relates to wireless communication systems, and more particularly to wireless relay networks. Background technique

 In the 3GPP Advanced Long Term Evolution Advanced (LTE-A) wireless communication system, hybrid automatic repeat (HARQ) technology is used to ensure reliable communication between user equipment (UE) and base station (eNB). Taking the TDD system as an example, for seven TDD frame structure configurations (Configuration) specified in the LTE technical specification with different uplink-downlink ratios or uplink and downlink subframe positions, the specification determines HARQ for each frame structure configuration. Timing (Timeline). As shown in FIG. 1, the slot distribution of configuration 2 is shown, in which subframes 0, 4 to 9 (slots) of each frame are used for downlink; subframes 2 and 3 are used for uplink; A subframe is a special subframe (S-subframe). In the configuration 2, for the downlink HARQ transmission, the eNB transmits the downlink data to the eNB in the downlink subframe No. 8 of the previous frame, and the specification specifies that the eNB should feed back the HARQ confirmation indication to the eNB in the third subframe of the current frame. , that is, positive acknowledgment ACK or negative acknowledgment NACK; for uplink HARQ transmission, the UE sends uplink data to the eNB in the second subframe, and the specification specifies that the eNB should feed back to the UE in the PHICH channel of the eighth downlink subframe of the current frame. HARQ ACK/NACK, if the UE receives the NACK, the UE will retransmit the uplink data in the subsequent uplink subframe.

 Currently, relay technology has been accepted by the LTE-A specification to improve system performance in terms of coverage and throughput of wireless communication systems. After introducing a relay node (RN) to the wireless network, the RN forwards data between the UE and the eNB in a time division multiplexed manner. The standardization organization has proposed two types of relay nodes, Type I Relay (3GPP TR 36.814 VI.0.2, Further Advancements for E-UTRA, Physical Layer Aspects) and Type II Relay (Type I Relay, 3GPP technical proposal Rl-092264 and Rl-092321).

However, the introduction of relays changes the timing of communication between the UE and the eNB. Up to now, TDD-based type 2 relay has not been considered in the 3GPP LTE-A standardization process. Under the HARQ retransmission timing. In the type 2 relay, in order to speed up the control signaling procedure and reduce the signaling overhead, the eNB is responsible for transmitting scheduling information to the UE in the physical downlink control channel (PDCCH). For downlink data transmission, the RN sends data from the eNB to the UE in a downlink subframe; after determining that the reception is correct, the UE sends a HARQ ACK/NACK to the RN in a predetermined uplink subframe, and the RN is in another The HARQ ACK/NACK is fed back to the eNB in the predetermined uplink subframe. For uplink data transmission, the UE sends uplink data to the RN in an uplink subframe; the RN checks whether the received uplink data transmission block (TB) is correct according to the CRC in the uplink data, and another one after the Sending a HARQ ACK/NACK message to the eNB in the predetermined uplink subframe; after receiving the HARQ ACK/NACK for the uplink data sent by the RN, the eNB will perform HARQ ACK on the uplink data in a subsequent predetermined downlink subframe. The NACK message is directly fed back to the UE to reduce the delay of the user plane.

 Since the communication timing between the UE and the eNB is changed by the introduced RN, for various TDD configurations in which the HARQ timing has been specified in the specification, after the RN is introduced, due to the shortage of the number of uplink/downlink subframes, Causes the HARQ timing to be unusable. For example, as shown in FIG. 2, the RN sends downlink data to the UE in the downlink subframe No. 8 of the previous frame, and the UE feeds back to the RN in the subframe No. 3 of the current frame according to the specification. And the acknowledgment indication of the HARQ; and, the UE sends the uplink data to the RN in the second subframe of the current frame, and expects the eNB to feed back the HARQ in the physical HARQ indicator channel (PHICH) in the eighth downlink subframe of the current frame. ACK/NACK. However, after receiving the uplink data from the UE and verifying whether the RN receives the data, the RN determines (checks the error) that the UE needs to retransmit or (verify correctly) the UE does not need to retransmit the uplink data, because the frame is in this frame. Before the downlink subframe No. 8, the RN has no available uplink subframe to send the determined result (HARQ ACK or NACK message) to the eNB, so the eNB cannot determine whether the RN receives before the downlink subframe No. 8 of the current frame. The uplink data of the UE is properly received, so that a HARQ ACK or NACK cannot be fed back to the UE in the downlink subframe No. 8 to inform the UE of the next operation. In this way, the UE's operation will be abnormal because the UE cannot receive the HARQ acknowledgment indication for its uplink data sent by the eNB in the desired subframe.

It can be seen that due to the strict regulation of the HARQ timing in the specification, the LTE-A wireless communication system introducing the RN cannot support the HARQ transmission under the condition of the TDD frame structure configuration 4. Lose. Similarly, TDD frame structure configuration 2 and configuration 5 also face similar problems as will be described in the Detailed Description of the Invention. Since the design requirements of the Type 2 relay need to maintain the backward compatibility of the Release-8 user equipment, it is impossible to change the HARQ under the various TDD frame structure configuration conditions specified in the specification for the Release-8 user equipment. Timing. This has had a major impact on the LET-A specification supporting Type 2 relays. How to provide effective support for the HARQ transmission process, especially the HARQ transmission process of uplink data after the introduction of the Type 2 RN has become an important issue that the industry must solve. Summary of the invention

 It can be seen that in the wireless relay network, it is necessary to provide a retransmission method that is backward compatible with the timing of the currently specified uplink data HARQ transmission. However, there is currently no solution to this problem in the prior art.

 In order to solve the problem, according to an aspect of the present invention, a method for controlling user equipment to perform uplink data retransmission in a base station is provided, where the user equipment sends uplink data to a relay station, where the method includes the following steps: Determining whether the user equipment is required to retransmit the uplink data before the predetermined time unit feeds back the confirmation indication of the uplink data to the user equipment: when not determined, in the predetermined time unit Sending a first indication to the user equipment, instructing the user equipment to save and not retransmit the uplink data, waiting for scheduling indication information sent by the base station; ii. determining that the user equipment needs or does not need to retransmit the After the uplink data, a scheduling indication information is generated and sent to the user equipment, and the user equipment is instructed to resend the uplink data to the relay station, or send other new uplink data.

Preferably, the step of determining whether the user equipment needs to retransmit the uplink data in the step i includes any one of the following: determining whether an available uplink physical resource is capable of receiving the uplink from the relay station Retransmission indication message of the data: when there is no available uplink physical resource, it is not determined whether the user equipment retransmits the uplink data; and, determining whether the uplink data from the relay station is received and processed is completed The retransmission indication message: when the retransmission indication message is not received or not processed, it is impossible to determine whether the user equipment needs to retransmit the uplink Data.

 According to another aspect of the present invention, an apparatus for controlling user equipment to perform uplink data retransmission is provided in a base station, where the user equipment sends uplink data to a relay station, where the apparatus includes: determining means, configured to determine Whether the user equipment is required to retransmit the uplink data; the first transmitter is configured to determine, after the determining apparatus returns a confirmation indication of the uplink data to the user equipment, in a predetermined time unit, whether it is needed When the user equipment retransmits, the first indication is sent to the user equipment in the predetermined time unit, and the user equipment is instructed to save and not retransmit the uplink data, and wait for the scheduling indication information sent by the base station; a second transmitter, configured to: after the determining apparatus determines that the user equipment is required to retransmit the uplink data, generate a scheduling indication information, and send the scheduling indication information to the user equipment, indicating the user equipment to the relay station Resend the uplink data or send other new uplink data.

 According to an embodiment of the present invention, in a wireless relay network, in a time unit of a predetermined feedback confirmation indication to the user equipment for uplink data, if it is not determined whether the user equipment needs to be retransmitted, the user equipment is always sent one The HARQ ACK indication indicates that the user equipment saves but does not retransmit the uplink data, so that the timing of the HARQ transmission that regulates the predetermined uplink data is maintained, and the specification definition of the user equipment side does not need to be modified; and, in determining whether the user equipment needs to be heavy After transmission, an uplink grant is used to control user equipment retransmission or new data transmission, resulting in less signaling overhead. DRAWINGS

 The above and other features, objects, and advantages of the present invention will become more apparent from the detailed description of the accompanying drawings.

 1 is a timing chart showing HARQ transmission of uplink data in a time slot distribution condition of TDD configuration 4 of an LTE-A wireless communication system without a relay device;

 2 is a timing diagram showing HARQ transmission of uplink data in a time slot distribution condition of TDD configuration 4 of an LTE-A wireless communication system including a relay device;

3 is a block diagram of an apparatus for controlling user equipment for uplink data retransmission in a base station according to an exemplary embodiment of the present invention; 4 is a flowchart of a method for a base station to control user equipment to perform uplink data retransmission according to an exemplary embodiment of the present invention;

 5 is a timing diagram of HARQ transmission of uplink data of a LTE-A wireless communication system under time slot distribution conditions of TDD configuration 4, in accordance with an embodiment of the present invention;

 6 is a timing diagram of HARQ transmission of uplink data of a LTE-A wireless communication system under time slot distribution conditions of TDD configuration 2, in accordance with an embodiment of the present invention;

 7 is a timing diagram of HARQ transmission of uplink data of a LTE-A wireless communication system under time slot distribution conditions of TDD configuration 5, in accordance with an embodiment of the present invention.

 In the figures, the same or similar reference numerals denote the same or similar components. detailed description

 Exemplary embodiments of a method and apparatus for performing uplink data retransmission by a base station controlling user equipment according to the present invention will now be described with reference to Figs. Here, the description will be made by taking the type 2 relay in the LTE-A wireless communication system as an example. It can be understood that the present invention is not limited thereto, and the present invention can be used in other specifications such as the IEEE 802.16 specification.

 As shown in FIG. 3, the device 3 for controlling the user equipment for uplink data retransmission in the base station includes a receiving device 30, a determining device 31, a first transmitter 32 and a second transmitter 33. The determining device 31 includes a first judging device 310 and a second judging device 311.

 The following is a description of the HARQ transmission of the uplink data by the base station eNB controlling the user equipment in the time slot distribution condition of the TDD frame structure configuration 4 according to FIG. 3, FIG. 4 and FIG.

 The user equipment UE sends uplink data to the relay device RN in the second subframe of the current frame. In one case, the relay device RN receives the uplink data from the UE, and determines that the uplink data has been received according to the CRC carried in the uplink data, that is, determines that the UE does not need to retransmit the uplink data. However, for the foregoing reasons, before the downlink subframe No. 8 of the current frame, the RN has no available uplink subframe to send a HARQ ACK message for the uplink subframe to the eNB.

 First, in step S40, before the predetermined downlink subframe No. 8 of the current frame for which the UE confirms the indication of the uplink data, for example, in the subframe No. 7 of the current frame, the determining means 31 determines whether or not it is determined whether or not The user equipment UE is required to retransmit the uplink data.

Specifically, the second determining device 311 determines whether the receiver 30 receives the relay from the relay. The retransmission indication message of the device RN. In this embodiment, since the No. 3 uplink subframe available to the relay device RN is already occupied, the relay device RN has no opportunity to transmit a HARQ ACK message corresponding to the uplink data to the base station eNB. Therefore, the second judging means 311 judges that the receiver 30 has not received the retransmission instruction message from the relay device RN, so the determining means 31 cannot determine whether the user equipment UE needs or does not need to retransmit the uplink data.

 Then, in step S41, the first transmitter sends a first indication to the user equipment UE in the eighth subframe of the current frame, instructing the user equipment UE to save and not retransmit the uplink data. Preferably, the first transmitter transmits a HARQ ACK message to the UE in the PHICH channel in the eighth subframe of the frame. The user equipment UE receives the HARQ ACK message of the uplink data HARQ transmission in the downlink subframe No. 8 of the current frame as specified by the specification, so that the operation of the wireless communication system conforms to the specification, and the user equipment UE does not operate abnormally. The user equipment UE does not retransmit the uplink data, and still stores it in the HARQ buffer, waiting to receive the next scheduling indication information of the base station to prepare the following operations.

 Then, in the second uplink subframe of the next frame, the relay device RN passes the check to obtain a HARQ ACK message for the uplink data of the user equipment UE to the base station eNB. In step S42, the receiver 30 receives the HARQ ACK message, performs decoding processing on the received HARQ ACK message, and determines that the HARQ ACK is received. In step S43, the determining device 31 determines that the user equipment UE is not based on the HARQ ACK. The uplink data needs to be retransmitted.

In step S44, the second transmitter 35 generates a scheduling indication information, and sends it to the user equipment UE in the eighth downlink subframe of the next frame, instructing the user equipment to send the relay device RN other new ones to be sent. Upstream data. Preferably, the scheduling indication information transmitted in the PDCCH includes an uplink grant (UL grant), and the uplink grant (UL grant) includes a new data indicator (NDI), which is a 1-bit logical value. When the value is 0, the UE is instructed to send other new uplink data. If the user equipment UE includes multiple HARQ processes at the same time, and the uplink data corresponding to each HARQ process is sent before, the UL grant further includes the RN received by the RN. Process ID of the HARQ process in which the upstream data is located.

 When the user equipment UE monitors the PDCCH signaling in the downlink subframe No. 8 of the next frame, obtains the UL grant sent to the user equipment UE, and extracts the NDI with the value 0 and the process identifier from the user. The device UE clears the uplink data sent last time in the process from the HARQ buffer, and sends the next uplink data to be sent. For the uplink data itself received by the RN, the RN will send it to the base station eNB in an uplink subframe that is available later.

 In another case, the relay device RN receives the uplink data from the UE, and determines the uplink data reception error according to the CRC carried in the uplink data, that is, when the UE needs to retransmit the uplink data, it is next. The HARQ NACK is transmitted to the base station eNB in the second uplink subframe of the frame. Since the receiving device 30 cannot receive the HARQ NACK before the downlink subframe No. 8 of the current frame, the second determining device 311 determines that the HARQ NACK is not received, and the determining device 31 cannot determine whether the user equipment UE needs to retransmit the uplink. Data, so similarly to the previous case, the first transmitter 32 transmits a HARQ ACK message to the UE in the PHICH channel in the eighth subframe of the frame, indicating that the user equipment UE does not retransmit and saves the uplink. data. The user equipment UE receives the positive acknowledgment of the uplink data HARQ transmission in the downlink subframe No. 8 of the current frame as specified by the specification, so that the operation of the user equipment UE conforms to the specification, and no abnormality occurs. The uplink data remains in the HARQ buffer of the user equipment UE and will not be cleared.

 Next, after receiving the HARQ NACK message from the RN for the uplink data in the second uplink subframe of the next frame, the receiving device 30 decodes the received HARQ ACK message and determines that the HARQ ACK message is received. The determining device 31 determines that the user equipment UE needs to retransmit the uplink data, and the second transmitter 33 generates a UL grant including an NDI value of 1, instructing the user equipment UE to resend the uplink data to the relay device RN, and The PDCCH is transmitted to the user equipment UE in the PDCCH in the eighth downlink subframe of the next frame.

When the user equipment UE monitors the PDCCH signaling in the downlink subframe No. 8 of the next frame, obtains the UL grant sent to the user equipment UE, and extracts the NDI with a logical value of 1, and then the user equipment UE The uplink data will be in the subsequent uplink subframe. Resend to the relay device RN. Referring to FIG. 6, the base station eNB controls the user equipment to perform HARQ transmission of uplink data under the subframe distribution condition of the TDD configuration 2 according to the present invention. In configuration 2, subframes 0, 3 to 5, and 8 and 9 of each frame are used for downlink; subframes 2 and 7 are used for uplink; subframes 1 and 6 are special subframes ( S-subframe ).

 As shown in FIG. 6, the user equipment UE sends uplink data to the relay device RN in the second subframe of the current frame. For configuration 2, the specification specifies that the eNB should feed back the HARQ ACK/NACK to the UE in the PHICH channel of the eighth downlink subframe of this frame.

 In one case, the relay device RN receives the uplink data from the UE, and determines that the uplink data has been received according to the CRC carried in the uplink data, that is, determines that the UE does not need to retransmit the uplink data. And in the uplink subframe No. 7 of the current frame, the HARQ ACK message for the uplink subframe is sent to the eNB.

 It can be clearly seen that since the base station eNB receives the message and processes the HARQ ACK message, the entire seventh uplink subframe is required. Therefore, before using the present invention, the base station eNB cannot perform the HARQ in the eighth downlink subframe. The ACK is sent to the user equipment UE. Therefore, the UE cannot receive the HARQ acknowledgment indication for the uplink data sent by the eNB in the No. 8 downlink subframe specified in the specification, and the UE's operation will be abnormal.

 According to the present invention, in the uplink subframe No. 7, the receiving apparatus 30 of the base station eNB receives the HARQ ACK message. Since the entire seventh uplink subframe is required to receive the message and process the HARQ ACK message, before the eighth downlink subframe, the second determining means 311 determines that the HARQ ACK message is not received and processed, so the determining device 31 cannot Determining whether the user equipment UE is required to retransmit the uplink data, and therefore, the first transmitter 32 sends a HARQ ACK message to the UE in the PHICH channel in the eighth subframe of the current frame, indicating that the user equipment UE does not retransmit and Save the upstream data. The user equipment UE receives the positive acknowledgment of the uplink data HARQ transmission in the downlink subframe No. 8 of the current frame as specified by the specification, so that the operation of the user equipment UE conforms to the specification, and no abnormality occurs. The uplink data remains in the HARQ buffer of the user equipment UE and will not be cleared.

Then, the receiving device 30 receives and decodes the HARQ ACK message, and determines the cancellation. After the ACK is ACK, the determining means 31 determines that the user equipment UE does not need to retransmit the uplink data, and the second transmitter 33 generates a UL grant including the NDI with a value of 0, and sets it in the downlink subframe No. 3 of the next frame. The PDCCH in the PDCCH is sent to the user equipment UE, and the user equipment UE is instructed to send other new uplink data to the relay equipment RN.

 When the user equipment UE monitors the PDCCH signaling in the downlink subframe No. 3 of the next frame, obtains the UL grant sent to the user equipment UE, and extracts the NDI with a logical value of 0, the user equipment UE The other new uplink data in the subsequent uplink subframe is sent to the relay device RN.

 In another case, the relay device RN receives the uplink data from the UE, and determines the uplink data reception error according to the CRC carried in the uplink data, that is, determines that the UE needs to retransmit the uplink data. Then, the relay device RN transmits one HARQ NACK to the base station eNB in the uplink subframe No. 7 of the current frame. The receiving device 30 receives the HARQ NACK message, but cannot decode the data before the eighth downlink subframe, and cannot determine that the message is a NACK message. Therefore, the determining means 31 cannot determine whether the user equipment is required to retransmit the uplink data. Then, the first transmitter 32 sends a HARQ ACK message to the UE in the PHICH channel in the eighth subframe of the current frame, indicating that the user equipment UE does not retransmit and saves the uplink data. After the receiving device 30 determines that the message is an ACK, the determining device 31 determines that the user equipment UE needs to retransmit the uplink data, and the second transmitter 33 generates a UL grant including the NDI with a value of 1, and places it in the next frame. The PDCCH in the downlink subframe 3 is sent to the user equipment UE, and the user equipment UE is instructed to retransmit the uplink data to the relay device RN.

When the user equipment UE monitors the PDCCH signaling in the downlink subframe No. 3 of the next frame, obtains the UL grant sent to the user equipment UE, and extracts the NDI with the logical value of 1, and then the user equipment UE The uplink data will be retransmitted to the relay device RN in the subsequent uplink subframe. Referring to FIG. 7, the base station eNB controls the user equipment to perform HARQ transmission of uplink data under the subframe distribution condition of the TDD configuration 5 according to the present invention. In configuration 2, subframes 0 and 3 to 9 of each frame are used for downlink; subframe 2 is used for uplink; The first subframe is a special subframe (S-subframe).

 As shown in Figure 7, the user equipment UE sends uplink data to the relay device RN in the second subframe of the current frame. For configuration 5, the specification specifies that the eNB should feed back the HARQ ACK/NACK to the UE in the PHICH channel of the eighth downlink subframe of this frame.

 In one case, the relay device RN receives the uplink data from the UE, and determines that the uplink data has been received according to the CRC carried in the uplink data, that is, determines that the UE does not need to retransmit the uplink data. Since there is no available uplink subframe in the current frame, the relay device RN will send a HARQ ACK message for the uplink subframe to the eNB in the second uplink subframe of the next frame.

 It can be clearly seen that since no uplink subframes available before the 8th downlink subframe receive the HARQ message from the RN, the base station eNB cannot be in the 8th downlink subframe before using the present invention. The HARQ ACK/NACK is sent to the user equipment UE. Therefore, the UE cannot receive the HARQ acknowledgment indication for the uplink data sent by the eNB in the 8th downlink subframe specified by the specification, and the UE will work abnormally.

 According to the present invention, before the downlink subframe No. 8 of the current frame, the first determining means 310 of the base station eNB determines whether the available uplink physical resource can receive the retransmission indication message for the uplink data from the relay station RN. Since there is no uplink subframe before the downlink subframe No. 8, the first determining device 310 determines that no uplink physical resource is available to receive the HARQ message, so the determining device 31 cannot determine whether the user equipment UE needs to retransmit the uplink data. Then, the first transmitter 32 sends a HARQ ACK message to the UE in the PHICH channel in the eighth subframe of the current frame, indicating that the user equipment UE does not retransmit and saves the uplink data. The user equipment UE receives the positive acknowledgment of the uplink data HARQ transmission in the subframe No. 8 of the current frame as specified by the specification, so that the operation of the user equipment UE conforms to the specification, and no abnormality occurs. The uplink data remains in the HARQ buffer of the user equipment UE and will not be cleared.

Next, in the second uplink subframe of the next frame, the receiving device 30 receives the HARQ ACK message and decodes it. After determining that the message is a HARQ ACK message, the determining means 31 determines that the user equipment UE does not need to retransmit the uplink data, and the second transmitter 33 generates a UL grant including an NDI having a value of 0, and sets it in the next frame. Downstream No. 6 The PDCCH in the frame is sent to the user equipment UE, and the user equipment UE is instructed to send other new uplink data to the relay equipment RN.

 When the user equipment UE is listening to the PDCCH signaling in the downlink subframe No. 6 of the next frame, the UE grants the UL grant sent to the user equipment UE, and extracts the NDI with a logical value of 0, and the user equipment UE The other new uplink data in the subsequent uplink subframe is sent to the relay device RN.

 In another case, the relay device RN receives the uplink data from the UE, and determines the uplink data reception error according to the CRC carried in the uplink data, that is, determines that the UE needs to retransmit the uplink data, and the relay device RN The HARQ NACK is transmitted to the base station eNB in the second uplink subframe of the next frame. The first determining device 310 determines that no uplink physical resource is available to receive the HARQ message, so the determining device 31 cannot determine whether the user equipment UE needs to retransmit the uplink. data. The first transmitter 32 transmits a HARQ ACK message to the UE in the PHICH channel in the eighth subframe of the frame, instructing the user equipment UE not to retransmit and save the uplink data. After the receiving device 30 receives the HARQ NACK message in the second uplink subframe of the next frame, and determines that the message is a NACK message, the determining device 31 determines that the user equipment UE needs to retransmit the uplink data, and the second transmitter 33 A UL grant including an NDI value of 1 is generated and sent to the user equipment UE in the PDCCH in the downlink subframe No. 6 of the next frame, instructing the user equipment UE to retransmit the uplink data to the relay device RN.

When the user equipment UE is listening to the PDCCH signaling in the downlink subframe No. 6 of the next frame, the user equipment obtains the UL grant sent to the user equipment UE, and extracts the NDI with the logical value of 1, and then the user equipment UE The uplink data will be retransmitted to the relay device RN in the subsequent uplink subframe. The embodiments of the present invention have been described above, and it is to be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications and changes within the scope of the appended claims. For example, the present invention is not limited to the above three cases of TDD frame structure configurations 2, 4, and 5. Configure conditions in any other frame structure In order to ensure the feedback timing of the uplink data HARQ transmission, the present invention may be used to send a HARQ ACK message to the user equipment in a predetermined feedback time unit when it is not determined whether the user equipment retransmission is required before the predetermined feedback time unit. And after determining whether the user equipment is required to retransmit, use an uplink grant to instruct the user equipment to resend the uplink data, or send other new uplink data.

 In addition, in the present invention, the base station eNB cannot determine whether the user equipment needs to retransmit the uplink received or not processed HARQ message, and any other situation that cannot determine whether the user equipment needs to retransmit the uplink data is in the claims of the present invention. Within the scope of protection. Moreover, the timing of the uplink data HARQ transmission mentioned above is merely an example, and the modified embodiment of the present invention is applicable to maintaining any other uplink data HARQ transmission timing, and these modified embodiments are also protected by the claims of the present invention.

 In the claims, the <RTIgt; "comprising"</RTI> does not exclude other elements and steps, and the word "a" does not exclude the plural. In the practical application of the invention, a component may perform the functions of the plurality of technical features recited in the claims. Any reference signs in the claims should not be construed as limiting the scope.

Claims

Claim A method for controlling a user equipment to perform uplink data retransmission in a base station, where the user equipment sends uplink data to a relay station, where the method includes the following steps:  Determining whether the user equipment is required to retransmit the uplink data before the predetermined time unit feeds back the confirmation indication of the uplink data to the user equipment: when the determination is impossible, in the predetermined time unit Sending a first indication to the user equipment, instructing the user equipment to save and not retransmit the uplink data, waiting for scheduling indication information sent by the base station;  Ii. After determining that the user equipment needs or does not need to retransmit the uplink data, generate a scheduling indication message and send the scheduling indication information to the user equipment, instructing the user equipment to resend the uplink data to the relay station, Or send other new upstream data.  The method according to claim 1, wherein the step of determining whether the user equipment needs to retransmit the uplink data in the step i includes any one of the following: Determining whether an available uplink physical resource is capable of receiving a retransmission indication message for the uplink data from the relay station: when there is no available uplink physical resource, it is not determined whether the user equipment retransmits the uplink Data  Determining whether the retransmission indication message for the uplink data from the relay station is received and processed: when the retransmission indication message is not received or not processed, it is not possible to determine whether the user equipment is The uplink data needs to be retransmitted;  The first indication includes a positive acknowledgment (ACK) sent in the retransmission control channel.  The method according to claim 1 or 2, wherein the step ii determines whether the user equipment needs to retransmit the uplink data includes:  Receiving a retransmission indication message for the uplink data from the relay station; - processing the retransmission indication message to determine whether the retransmission indication message is a positive acknowledgment (ACK) or a negative acknowledgment (NACK): - when the retransmission indication information is a positive acknowledgment (ACK), the use is determined The user equipment does not need to retransmit the uplink data;  - when the retransmission indication information is a negative acknowledgment (NACK), it is determined that the user equipment needs to retransmit the uplink data.  The method according to claim 3, wherein the scheduling indication information comprises an uplink grant sent in a downlink control channel, the uplink grant includes a new data indication (NDI), and the new data indication The different logic states respectively indicate that the user equipment performs a retransmission operation of the uplink data or sends other new uplink data to the relay station.  The method according to claim 4, wherein the uplink grant further includes an identifier of a retransmission request process in which the uplink data is located.  The method according to claim 1, wherein the base station, the user equipment, and the relay station are based on an Advanced Long Term Evolution (LTE-Advanced) protocol specification or an IEEE 802.16 protocol specification.  A device for controlling user equipment to perform uplink data retransmission in a base station, where the user equipment sends uplink data to a relay station, where the device includes:  Determining means for determining whether the user equipment is required to retransmit the uplink data; - a first transmitter, configured to feed back, to the user equipment, the uplink data at the predetermined time unit by the determining means When the acknowledgment indication fails to determine whether the user equipment retransmission is required, a first indication is sent to the user equipment in the predetermined time unit, indicating that the user equipment saves but does not retransmit the uplink data, and waits The scheduling indication information sent by the base station;  a second transmitter, configured to: after the determining device determines that the user equipment is required to retransmit the uplink data, generate a scheduling indication information and send the information to the user equipment, indicating that the user equipment is The relay station resends the uplink data or transmits other new uplink data.  8. The apparatus according to claim 7, wherein the determining means comprises any one of the following sub-devices: a first determining means, configured to determine whether an available uplink physical resource is capable of receiving a retransmission indication message for the uplink data from the relay station: when not available The determining device is unable to determine whether the user equipment retransmits the uplink data when the physical resource is uplinked;  a second determining means, configured to determine whether the retransmission indication message for the uplink data from the relay station is received and processed: when the retransmission indication message is not received or not processed, The determining device is unable to determine whether the user equipment needs to retransmit the uplink data;  The first indication includes a positive acknowledgement sent in the retransmission control channel ( ACK );  The scheduling indication information includes an uplink grant, the uplink grant includes a new data indication (NDI), and the different logic states indicated by the new data respectively indicate that the user equipment performs retransmission of the uplink data to the relay station. Operate or send other new upstream data.  The device according to claim 8, wherein the device further comprises: - receiving means, receiving a retransmission indication message for the uplink data from the relay station, and determining the weight Whether the indication message is positive acknowledgment (ACK) or negative acknowledgment (NACK):  - when the retransmission indication information is a positive acknowledgment (ACK), the determining means determines that the user equipment does not need to retransmit the uplink data;  - when the retransmission indication information is a negative acknowledgment (NACK), the determining means determines that the user equipment needs to retransmit the uplink data;  - when the receiving device does not receive or does not determine whether the retransmission indication message is a positive acknowledgment (ACK) or a negative acknowledgment (NACK), the second judging device judges that the retransmission is not completed or not processed Indicate the message.  10. The device according to claim 7, wherein the base station is based on an Advanced Long Term Evolution (LTE-Advanced) specification or an IEEE 802.16 specification.