WO2010135955A1 - 一种混合自动重传请求方法及基站设备 - Google Patents

一种混合自动重传请求方法及基站设备 Download PDF

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Publication number
WO2010135955A1
WO2010135955A1 PCT/CN2010/072801 CN2010072801W WO2010135955A1 WO 2010135955 A1 WO2010135955 A1 WO 2010135955A1 CN 2010072801 W CN2010072801 W CN 2010072801W WO 2010135955 A1 WO2010135955 A1 WO 2010135955A1
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Prior art keywords
packet
terminal
sub
base station
data packet
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PCT/CN2010/072801
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English (en)
French (fr)
Inventor
刘锟
鲁照华
罗薇
刘颖
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中兴通讯股份有限公司
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Publication of WO2010135955A1 publication Critical patent/WO2010135955A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end

Definitions

  • the present invention relates to the field of communications, and in particular, to a hybrid automatic repeat request processing method and a base station device. Background technique
  • a base station refers to a device that provides services to a terminal.
  • the base station communicates with the terminal through uplink and downlink.
  • the so-called downlink (forward) refers to the direction from the base station to the terminal
  • the so-called uplink (reverse) refers to the terminal to the base station.
  • a plurality of terminals can simultaneously transmit data to the base station through the uplink, or can simultaneously receive data from the base station through the downlink.
  • the wireless communication system can use error control methods such as Forward Error Correction (FEC) and Automatic Repeat Request (ARQ). To reduce the bit error rate of the system to ensure the quality of communication.
  • FEC Forward Error Correction
  • ARQ Automatic Repeat Request
  • the combination of the two methods generates a hybrid automatic repeat request (HARQ, Hybrid ARQ) scheme: the transmitting end first sends the modulated encoded data packet to the receiving end, and the receiving end pairs The received information is subjected to error correction decoding. If the decoding can be successfully completed, the successful receiving identifier (ACK) is fed back to the transmitting end, and no retransmission is needed; if the decoding cannot be successfully performed, the error receiving identifier (NACK) is fed back. The information is required to retransmit the data by the sender. It can be seen that HARQ technology can improve the performance of the system and flexibly adjust the symbol rate.
  • HARQ Hybrid ARQ
  • HARQ technology combines automatic retransmission technology and forward error correction coding technology to detect errors and correct them.
  • HARQ has three modes: The first type is that the receiver cannot discard. The successfully decoded sub-packet notifies the transmitting end to retransmit the original signal copy through the feedback channel; the second type is that the receiving end saves the sub-packet that cannot be successfully decoded, and notifies the transmitting end to retransmit the original signal copy through the feedback channel. Usually, this method is called CC, Chase Combining.
  • the third type is that the receiver saves the sub-packets that cannot be successfully decoded.
  • the re-transmission sub-packets can be compared with the previous sub-packets.
  • the packets are the same or different. Usually this method is called Increment Redundancy (IR).
  • the incremental redundancy technique divides the bits after the convolutional code, or turbo code, or low-density parity check code into several sub-packets according to a specific rule, numbered SPO, SP1, SPN.
  • the sub-packet SP0 includes system bit information. Therefore, in the downlink direction, after the base station assigns the downlink resource to the terminal, the base station transmits the SP0 sub-packet when using the downlink resource for the first data transmission of the terminal, so as to ensure that the channel condition is allowed.
  • the terminal can successfully decode as quickly as possible; when a retransmission occurs, the base station can freely select the retransmitted sub-packet for retransmission.
  • system bit information described herein refers to the actual data bit information that the base station needs to send to the terminal through the HARQ packet, and may also be referred to as service data, where the system bit information does not include different coding modes. Generated redundant bit information. For example: For voice services, system bit information refers to the voice data bits sent to the receiving end.
  • the base station may not receive any abnormality about the feedback information of the success or failure of the HARQ packet received by the terminal, and thus, according to the HARQ mechanism, The first retransmission, but if the base station randomly selects the sub-packet retransmission at this time, it will affect the terminal decoding success rate, and according to the HARQ mechanism, it will cause multiple retransmissions, thereby reducing the system frequency efficiency.
  • the embodiment of the invention provides a hybrid automatic repeat request method and a base station device, which can solve In the case that the base station does not receive any feedback information about the success or failure of the data packet transmission sent by the terminal, the packet decoding success rate of the terminal is low and the spectrum efficiency of the system is low.
  • the hybrid automatic repeat request method provided by the embodiment of the present invention includes: a base station allocates a downlink resource for the terminal, and uses the downlink resource to use a hybrid automatic repeat request.
  • the first sub-packet of the data packet is transmitted to the terminal; if the base station does not receive the feedback information about the success or failure of the data packet sent by the terminal within the set time period, the base station Allocating a new downlink resource to the terminal, and retransmitting the first sub-packet of the data packet to the terminal by using the newly allocated downlink resource.
  • the method further includes: the base station re-allocating a new downlink resource to the terminal, and retransmitting the first sub-packet of the data packet to the terminal by using the re-allocated new downlink resource. Packet, until the base station receives feedback information about the success or failure of the data packet received by the terminal within a set time period, or until the number of transmissions reaches the maximum number of retransmissions.
  • the method further includes: the terminal re-receiving according to the received The first sub-packet transmitted performs a decoding process of the data packet. If the terminal receives the first sub-packet before receiving the first sub-packet retransmitted by the base station, but fails to decode the data according to the first sub-packet that has been received.
  • the method further includes: storing a first sub-packet that does not successfully decode the data packet; after receiving the first sub-packet of retransmission, the terminal according to the first sub-retransmission The packet and the first sub-packet previously stored for failing to successfully decode the data packet perform the decoding process of the data packet.
  • the terminal before receiving the first sub-packet of the retransmission, the terminal has received the first sub-packet and successfully decodes the data according to the first sub-packet that has been received. And the method further includes: the terminal abandoning decoding the first sub-packet of the retransmission, and sending, by using a feedback channel, feedback information that the data packet is successfully decoded.
  • the first sub-packet of the data packet transmitted each time carries the service data information of the data packet.
  • the first sub-packet of the retransmitted data packet is the same or different from the modulation coding mode used by the first sub-packet of the previously transmitted data packet.
  • the set duration is a default configuration and is stored in the base station, or is sent by the upper layer network unit to the base station by signaling.
  • the base station device further provided by the embodiment of the present invention includes: a resource assignment module, configured to allocate a downlink resource to the terminal; and a data transmission module, configured to use a downlink resource allocated for the terminal, and use the HARQ mode to The terminal transmits the first sub-packet of the data packet;
  • the feedback information receiving module is configured to receive feedback information about whether the data packet is successfully received by the terminal, and the indication module is configured to: Receiving, by the terminal, any feedback information about the success or failure of the data packet received by the terminal, instructing the resource assignment module to allocate a new downlink resource to the terminal, and instructing the data transmission module to utilize The newly allocated downlink resource retransmits the first sub-packet of the data packet to the terminal.
  • the indication module is further configured to: instruct the resource assignment module to allocate a new downlink resource to the terminal, and instruct the data transmission module to use the downlink resource direction again Transmitting, by the terminal, the first sub-packet of the data packet, until the feedback information receiving module receives feedback information about whether the data packet is successfully received or not sent by the terminal within a set time period, or until the transmission The number of times the maximum number of retransmissions has been reached.
  • the first sub-packet of the data packet that is transmitted by the data transmission module carries the service data of the data packet; or the data transmission module retransmits the first data packet.
  • the same as the first sub-packet of the previous transmission of the data packet The foregoing base station device further includes: a configuration module, configured to configure the set duration by using a default configuration manner or by receiving signaling of the upper layer network unit.
  • the base station does not receive the abnormality of the feedback information about the success or failure of the data packet sent by the terminal within the set time period, and the foregoing
  • the base station allocates a new downlink resource to the terminal, and uses the newly allocated downlink resource to transmit the first sub-packet of the data packet to the terminal.
  • This has the following two effects: On the one hand, in the HARQ process, the base station retransmits the first sub-packet of the data packet, and the first sub-packet carries the system bit information (ie, the service). data).
  • the present invention uses the newly allocated downlink resource to transmit the first sub-packet of the data packet to the terminal, which can ensure that the terminal successfully decodes the data packet, and thus the base station arbitrarily selects the sub-packet retransmission in the existing HARQ mechanism.
  • the decoding success rate of the terminal is improved; and if the terminal successfully decodes the data packet, the base station is no longer required to perform retransmission, thereby improving the system spectrum efficiency.
  • the terminal may receive the new downlink resource indication information allocated by the base station, and then receive the base station through the downlink resource.
  • the first sub-packet of the data packet is transmitted, thereby ensuring the success rate of the first sub-packet of the data packet received by the terminal to some extent, thereby improving the packet decoding success rate of the terminal.
  • FIG. 1 is a schematic diagram of a HARQ process of a data packet according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of a HARQ process of a data packet in Embodiment 2 of the present invention
  • FIG. 3 is a schematic diagram of a HARQ process of a data packet according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic diagram of a two-dimensional distribution of time-frequency resources allocated by a base station according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a base station device according to an embodiment of the present invention. detailed description
  • the embodiments of the present invention improve the existing HARQ process and the base station device, and the base station does not receive any feedback information about the success or failure of the HARQ packet reception sent by the terminal, through the improved HARQ process and the base station device, thereby Ensure successful decoding of HARQ packets, thereby improving system spectral efficiency.
  • the feedback information is information about whether the data packet is successfully received, such as an ACK or a NACK signal.
  • the HARQ packet refers to a data packet transmitted by using the HARQ method.
  • the reason why the base station does not receive any feedback information about the success or failure of the HARQ packet reception sent by the terminal may include:
  • the terminal When the base station assigns a downlink resource for transmitting a data packet to the terminal, the terminal does not decode or cannot successfully decode the downlink resource indication information, so that the downlink resource allocated by the base station is not known, so that the terminal naturally cannot receive the base station for its transmission.
  • the HARQ packet naturally does not feed back any feedback information about the success or failure of the HARQ packet reception; or the terminal can learn the downlink resource allocated by the base station, and can also receive and decode the first HARQ packet according to the downlink resource.
  • the sub-packet, and the feedback information is sent, but the feedback information of the terminal is not received by the base station.
  • a HARQ process of a data packet according to Embodiment 1 of the present invention which describes a HARQ process flow caused by a terminal not successfully receiving or decoding downlink resource indication information.
  • the base station divides the HARQ packet to be transmitted into a plurality of sub-packets according to a specific rule, which are respectively SPO, SP1, and SPN, where the SP0 is the first sub-packet of the HARQ packet, and the SP0 carries All system bit information sent to the terminal, that is, the first sub-packet transmitted each time carries the service data information of the HARQ packet.
  • Step 101 The base station allocates a downlink resource to the terminal, and notifies the terminal of the allocated downlink resource.
  • the base station may notify the terminal of the downlink resource allocated by the terminal by sending control signaling (such as a resource assignment message), and the manner of sending the control signaling may be unicast, multicast, or broadcast.
  • the control signaling that is sent carries control information (or downlink resource indication information), and the control information generally includes: (1) downlink resource information allocated to the terminal and selected modulation and coding mode information; (2) allocation for the terminal The feedback channel information for feeding back the success or failure of the data packet reception; (3) indicating that the sub-packet received by the terminal is the indication information of the first transmission packet or the retransmission packet.
  • the first transmission packet refers to a sub-packet that is transmitted for the first time; and the retransmission packet refers to a sub-packet that is retransmitted.
  • the base station may notify the terminal of the feedback channel information allocated to the terminal in an explicit or implicit manner, where the display mode refers to carrying the feedback channel information in the control information, and the implicit mode refers to the control.
  • the information carries the index information of the feedback channel, and the terminal determines the feedback channel information by learning the index information.
  • the allocated downlink resource may be a time-frequency two-dimensional resource, such as a time-frequency resource block.
  • Figure 4 shows a two-dimensional distribution of the time-frequency resources allocated by the base station to the terminal.
  • C1 represents the time-frequency resource occupied by the control information sent by the base station
  • SP0 represents the occupied by the SP0 sub-packet sent by the base station to the terminal.
  • Time-frequency resources are time-frequency resources allocated by the base station to the terminal.
  • Step 102 The base station sends the SP0 sub-packet of the data packet to be transmitted to the terminal, and indicates that the SP0 sub-packet is the first transmission packet.
  • Step 103 If the terminal does not receive the downlink resource allocated by the base station, and the base station does not receive any feedback information about the success or failure of the data packet sent by the terminal within the set duration, the base station refers to the terminal. With new downlink resources;
  • the terminal does not successfully send any control information sent by the base station to the base station, so that the terminal does not send any feedback information about the success or failure of the data packet reception, so that the base station does not receive any of the terminal within the set duration.
  • Feedback letter on the success or failure of the data packet reception In this case, the base station assigns a new downlink resource to the terminal.
  • the set duration is a default configuration and is stored in the base station, or is sent by the upper layer network unit to the base station by signaling.
  • the base station When the base station does not receive any feedback information about the success or failure of the data packet received by the terminal within the set duration, the base station allocates a new downlink resource to the terminal, and notifies the terminal of the newly allocated downlink resource.
  • the notification manner can be as described above, including the method of using unicast, multicast or broadcast.
  • the content of the downlink resource indication information that is notified to the terminal may also be as described above, that is, the location information of the downlink resource allocated to the terminal, and the selected modulation and coding mode information, and the received data packet received by the terminal.
  • the feedback channel information of the success or failure and the indication that the sub-packet received by the terminal is the first packet or the retransmission packet.
  • the base station may determine whether to receive the feedback information sent by the terminal by scanning the feedback channel allocated to the terminal within a set duration, and when the set duration arrives, it does not receive any relevant data sent by the terminal from the feedback channel.
  • the terminal is assigned a new downlink resource.
  • Step 104 The base station retransmits the SP0 sub-packet of the data packet to the terminal by using the newly allocated downlink resource, and indicates that the SP0 sub-packet is a retransmission packet.
  • the modulation and coding mode used by the base station to retransmit the SP0 sub-packet may be the same as or different from the modulation and coding mode used by the base station to transmit the SP0 sub-packet before.
  • the SP0 sub-packet carries all system bit information sent to the terminal.
  • Step 105 After successfully decoding the data packet by the SP0 sub-packet retransmitted by the base station, the terminal sends the feedback information that the data packet is successfully decoded to the base station.
  • the terminal After the terminal successfully receives the downlink resource indication information that is newly allocated by the base station, the terminal uses the downlink resource to receive the SP0 sub-packet transmitted by the base station.
  • the terminal learns that the SP0 sub-packet is a retransmission packet, but the terminal
  • the first transmission packet of the SPO sub-packet is not received and decoded, and the data packet decoding process is performed according to the received SP0 sub-packet to obtain all data in the data packet, and the data packet is sent to the base station after decoding. Feedback information on whether the decoding is successful or not.
  • Step 106 After receiving the feedback information of the terminal within the set duration, the base station performs the following procedure according to the HARQ conventional procedure.
  • the subsequent process After receiving the feedback information of the terminal from the feedback channel indicated by the downlink resource newly allocated for the terminal, the subsequent process is processed according to the HARQ regular process, and is not described here.
  • the base station re-assigns the downlink resource to the terminal, and uses the downlink resource to retransmit the SP0 sub-packet for the terminal.
  • the terminal cannot successfully receive and decode the downlink resource indication information allocated by the base station, which may have certain contingency (such as the channel quality degradation caused by the abnormal situation), and the terminal may again receive and decode the downlink resource indication information that is sent again by the base station.
  • the relationship is relatively low. Therefore, as described in the above procedure, the terminal can ensure that the SP0 sub-package can be successfully received as much as possible, and then the data packet is successfully decoded.
  • the base station after the base station retransmits the first sub-packet of the HARQ packet, that is, the SPO sub-packet, by using the newly allocated downlink resource, if the base station does not receive the sent by the terminal within the set duration, Regarding the feedback information about whether the HARQ packet is successfully received, the base station allocates a new downlink resource to the terminal again, and retransmits the first sub-packet of the HARQ packet to the terminal by using the downlink resource, Until the feedback information about the success or failure of the HARQ packet reception sent by the terminal can be received within the set duration, or until the number of transmissions reaches the maximum number of retransmissions.
  • Embodiment 2 Referring to FIG.
  • a HARQ process of a data packet according to Embodiment 2 of the present invention is shown.
  • the process describes that a terminal can successfully receive and decode downlink resource indication information, and can successfully receive and decode an SP0 sub-packet, but because the terminal
  • the HARQ process flow caused by the feedback information that the transmitted data packet is successfully received or not is not received by the base station.
  • the number of the plurality of sub-packets of the data packet is described as SPO, SP1, SPN, respectively, and the SP0 sub-packet carries all the system information bits sent to the terminal.
  • the base station wants to transmit a new data packet to the terminal, the following steps are performed:
  • Step 201 The base station allocates a downlink resource to the terminal, and notifies the terminal of the allocated downlink resource.
  • the base station may notify the terminal of the downlink resource allocated by the terminal by sending control signaling (such as a resource assignment message), and the manner of sending the control signaling may be unicast, multicast, or broadcast.
  • the control signaling that is sent carries the control information (or the downlink resource indication information), where the control information generally includes: (1) location information of the downlink resource allocated for the terminal and the selected modulation and coding mode information; The feedback channel information allocated by the terminal for feeding back the success or failure of the data packet reception; (3) indicating that the sub-packet received by the terminal is the indication information of the first transmission packet or the retransmission packet.
  • Step 202 The base station sends the SP0 sub-packet of the data packet to be transmitted to the terminal, and indicates that the SP0 sub-packet is the first transmission packet.
  • Step 203 The terminal receives the SP0 sub-packet by using the downlink resource, and performs decoding, and after successfully decoding the data packet, sends, to the base station, feedback information that the data packet is successfully decoded.
  • the terminal After the terminal successfully receives the downlink resource indication information allocated by the base station, the terminal uses the downlink resource to receive the SP0 sub-packet transmitted by the base station, and decodes the data packet according to the SP0 sub-packet. After successfully decoding the data packet, the terminal sends feedback information of the data packet, such as an ACK message, to the base station by using the feedback channel allocated by the base station to indicate that the terminal has successfully received and decoded the data packet when the feedback period arrives.
  • feedback information of the data packet such as an ACK message
  • Step 204 If the base station does not receive any data about the data sent by the terminal within a set duration If the packet is successfully received or not, the base station allocates a new downlink resource to the terminal. In this step, the base station does not receive the terminal within the set time period after the terminal sends the feedback information due to the network or device abnormality. Sending any feedback information about the success or failure of the data packet reception, and then the base station allocates a new downlink resource to the terminal, and notifies the terminal of the newly allocated downlink resource, and the notification manner used may be as described above. And the content included in the downlink resource indication information notified to the terminal may also be as described above.
  • the base station may determine whether to receive the feedback information sent by the terminal by scanning a feedback channel allocated to the terminal, and when the set duration is reached, the terminal does not receive the notification from the feedback channel. Any feedback on the success of the receipt of the data packet assigns the terminal a new downlink resource.
  • Step 205 The base station retransmits the SP0 sub-packet of the data packet to the terminal by using the newly allocated downlink resource, and indicates that the SP0 sub-packet is a retransmission packet.
  • the modulation and coding mode used by the base station to retransmit the SP0 sub-packet may be the same as or different from the modulation and coding mode used by the base station to transmit the SP0 sub-packet before.
  • the SP0 sub-packet carries all system bit information sent to the terminal.
  • Step 206 After receiving the SP0 sub-packet, the terminal sends, to the base station, feedback information that the data packet is successfully decoded.
  • the terminal After the terminal successfully receives the downlink resource indication information that is newly allocated by the base station, the terminal uses the downlink resource to receive the SP0 sub-packet transmitted by the base station. After the terminal learns that the SP0 sub-packet is a retransmission packet, if the terminal has received the first transmission packet of the SP0 sub-package before the terminal has successfully decoded, the retransmission packet of the SP0 sub-packet may be directly discarded. And transmitting, to the base station, feedback information, such as ACK, that the data packet is successfully decoded.
  • feedback information such as ACK
  • Step 207 After receiving the feedback information of the terminal within the set duration, the base station performs the subsequent process according to the HARQ regular process.
  • the channel receives the feedback information of the terminal, and the subsequent process is processed according to the HARQ regular process, and details are not described herein again.
  • the feedback information for the successful reception of the data packet sent by the terminal is not received by the base station, and the base station re-assigns the terminal.
  • the line resource is used to retransmit the first sub-packet, that is, the SP0 sub-packet, for the terminal, and the retransmission packet of the SP0 sub-packet is discarded when the terminal learns that the first transmission packet of the SP0 sub-package has been successfully decoded.
  • the second embodiment can use the newly allocated downlink resource to transmit the SP0 sub-packet of the HARQ packet to the terminal, so as to ensure that the terminal successfully decodes the HARQ packet, thereby improving The decoding success rate of the terminal, thereby improving the system frequency efficiency.
  • a HARQ process of a data packet according to Embodiment 3 of the present invention is shown.
  • the process describes that a terminal can successfully receive and decode downlink resource indication information, and can receive a SP0 sub-packet first packet but fails to successfully decode a data packet.
  • the resulting HARQ process flow.
  • the numbers of the multiple sub-packets of the data packet are described as SPO, SP1, SPN, where the SP0 sub-packet carries all the system information bits sent to the terminal.
  • the base station wants to transmit a new data packet to the terminal, perform the following steps:
  • Step 301 The base station allocates a downlink resource to the terminal, and notifies the terminal of the allocated downlink resource indication.
  • this step is the same as steps 101 and 201 of the foregoing embodiment.
  • Step 302 The base station sends, to the terminal, the SP0 sub-packet of the data packet to be transmitted, and indicates that the SP0 sub-packet is the first transmission packet.
  • Step 303 The terminal receives the SP0 sub-packet by using the downlink resource, and decodes, when the data packet is not successfully decoded according to the SP0 sub-packet, the base station sends the feedback information of the packet decoding failure to the base station; the terminal successfully receives the downlink allocated by the base station. After the resource indication information, the downlink resource is utilized. Receiving an SPO sub-packet transmitted by the base station, and decoding according to the SP0 sub-packet to obtain data in the data packet.
  • the terminal saves the SP0 sub-packet, and uses the feedback channel allocated by the base station to send the feedback information of the data packet failure to the base station.
  • Such as NACK message Such as NACK message.
  • Step 304 If the base station does not receive any feedback information about the success or failure of the data packet sent by the terminal within the set duration, the base station allocates a new downlink resource to the terminal.
  • the base station does not receive any feedback information about the success or failure of the data packet received by the terminal within the set duration, and the base station is the terminal.
  • the new downlink resource is allocated, and the newly allocated downlink resource is notified to the terminal, and the notification manner may be as described above, and the content included in the downlink resource indication information notified to the terminal may also be as described above. This is a comment.
  • the base station may determine whether to receive the feedback information sent by the terminal by scanning a feedback channel allocated to the terminal, and when the set duration is reached, the terminal does not receive the transmission from the feedback channel. Any feedback information about the success or failure of the data packet reception, the base station assigns a new downlink resource to the terminal.
  • Step 305 The base station retransmits the SP0 sub-packet of the data packet to the terminal by using the newly allocated downlink resource, and indicates that the SP0 sub-packet is a retransmission packet.
  • the SP0 sub-packet carries all system bit information sent to the terminal. It should be noted that, in this step, the modulation and coding mode used by the base station to retransmit the SP0 sub-packet may be the same as or different from the modulation and coding mode used by the base station to transmit the SP0 sub-packet before.
  • Step 306 The terminal performs data packet decoding according to the retransmission packet of the SP0 sub-packet and the previously stored SP0 sub-packet, and sends the feedback information that the data packet is successfully decoded to the base station after the decoding succeeds;
  • the terminal uses the downlink resource to receive the SP0 sub-packet transmitted by the base station.
  • the terminal learns that the SP0 sub-packet is a retransmission packet, and the terminal has received the SP0 sub-packet before but fails to decode the data packet according to the SP0 sub-packet, then the root
  • the data packet is decoded according to the retransmission packet of the SPO sub-packet and the previously stored SP0 sub-packet data, and after decoding, the feedback information of whether the data packet is successfully decoded or not is sent to the base station.
  • Step 307 If the base station receives the feedback information of the terminal within the set duration, the subsequent process is performed according to the HARQ regular process.
  • the subsequent process is processed according to the HARQ regular process, and details are not described herein again.
  • the base station re-assigns the downlink resource to the terminal, and uses the downlink resource to re-use the terminal.
  • the SP0 sub-packet is transmitted, so that the terminal can decode the data packet according to the retransmission packet and the first transmission packet of the SP0 sub-packet, and the decoding success rate of the data packet of the terminal can be improved compared with the existing HARQ mechanism, thereby improving the spectrum efficiency of the system. .
  • the base station after transmitting the first transmission packet of the SP0 sub-packet to the terminal by using the newly allocated downlink resource, the base station waits to receive the feedback information of the terminal; if it is within the set duration If the terminal does not receive any feedback information about the success or failure of the data packet received on the newly allocated feedback channel, the terminal allocates a new downlink resource to the terminal again, and indicates the re-allocated downlink resource to the terminal; And transmitting, by the re-allocated downlink resource, a retransmission packet of the SP0 sub-packet of the data packet to the terminal.
  • the process can be performed multiple times until the base station receives the feedback information of the success or failure of the data packet sent by the terminal within the set time period.
  • the maximum number of transmissions made by this process can be set by the system, or it can be the same as or different from the maximum number of retransmissions of HARQ.
  • the base station if the base station fails to receive any feedback information about the success or failure of the data packet received by the terminal within the set time period through multiple resource allocation and data retransmission processes, the base station temporarily gives up the The terminal transmits the data packet and waits for the channel condition to allow the data transmission. In this way, it is possible to prevent the terminal from occupying too much system resources and affecting it. His terminal's business, thereby improving the system's spectral efficiency.
  • the set duration may be stored in the base station by default, or may be determined by the upper layer network unit of the base station and notified to the base station by signaling.
  • the upper layer network element of the base station may be a base station controller, an access service network, a connection service network, a core network gateway, or the like.
  • FIG. 5 is a schematic structural diagram of a base station device according to an embodiment of the present invention.
  • the base station device includes: a conventional interface module, such as a first communication interface module 501 for performing information interaction with a terminal, for upper layer of a base station device.
  • the second communication interface module 502 is configured by the network unit, and the first communication interface module 501 may include: a baseband unit, a radio unit, and the like.
  • the base station device further includes: a resource assignment module 503, a data transmission module 504, a feedback information receiving module 505, and an indication module 506, and further includes a configuration module 507, where: the resource assignment module 503 is configured to be a terminal Assign downstream resources.
  • the first communication interface module 501 can send a message carrying the downlink resource indication information by using the first communication interface module 501, so that the terminal can learn the allocation of the downlink base station. Downstream resources;
  • a data transmission module 504 configured to transmit, by using a downlink resource that is assigned to the terminal, a first sub-packet of the HARQ packet to the terminal, where the first sub-packet carries all system bit information sent to the terminal (ie, needs to pass All the service data transmitted by the HARQ packet to the terminal).
  • the data transmission module 504 transmits the first sub-packet through the first communication interface module 501;
  • the feedback information receiving module 505 is configured to receive feedback information about whether the HARQ packet is successfully received by the terminal.
  • the feedback information receiving module 505 can scan the feedback channel assigned to the terminal through the first communication interface module 501 to determine whether there is feedback information about whether the data packet sent by the terminal is successfully received or not;
  • the indicating module 506 is configured to receive the end of the feedback information receiving module 505 within a set time period.
  • the resource allocation module 503 is configured to assign a new downlink resource to the terminal, and instructs the data transmission module 504 to retransmit the terminal to the terminal by using the newly assigned downlink resource.
  • the resource assignment module 503 and the data transfer module 504 will operate in accordance with the instructions of the indication module 506.
  • the data transmission module 504 transmits the first sub-packet of the HARQ packet to the terminal by using the newly assigned downlink resource, if the feedback information receiving module 505 has not received any HARQ sent by the terminal within the set duration, If the packet is successfully received or not, the indication module 506 again instructs the resource assignment module 503 to assign a new downlink resource to the terminal, and instructs the data transmission module 504 to retransmit the HARQ packet to the terminal by using the downlink resource.
  • the first sub-packet, until the feedback information receiving module 505 can receive the feedback information sent by the terminal about the success or failure of the HARQ packet reception within a set time period, or until the number of transmissions reaches the maximum number of retransmissions.
  • the configuration module 507 of the foregoing base station device is configured to configure the set duration, and the configuration manner includes: a default configuration mode or a manner of receiving signaling of an upper layer network unit.

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Description

一种混合自动重传请求方法及基站设备 技术领域
本发明涉及通信领域, 尤其涉及一种混合自动重传请求处理方法以及 基站设备。 背景技术
通信系统中, 基站是指给终端提供服务的设备, 基站通过上下行链路 与终端进行通信, 所谓下行(前向)是指基站到终端的方向, 所谓上行(反 向)是指终端到基站的方向。 多个终端可同时通过上行链路向基站发送数 据, 也可以通过下行链路同时从基站接收数据。
为了克服无线移动信道时变和多径衰落对信号的影响, 无线通信系统 可以釆用基于前向纠错( FEC , Forward Error Correction )和自动重传( ARQ , Automatic Repeat Request )等差错控制方法, 来降低系统的误码率以保证通 信质量。 其中, FEC方案虽然产生的时延较小, 但存在编码冗余并降低系统 吞吐量的问题; 而 ARQ虽然不存在编码冗余, 但是产生了较大的时延, 不 适于实时服务。 于是, 为了克服二者上述的缺点, 将这两种方法结合就产 生了混和自动重传请求 (HARQ, Hybrid ARQ )方案: 发送端先将调制编 码后的数据包发送到接收端, 接收端对收到的信息进行糾错解码, 如果能 够成功地完成解码,则向发送端反馈成功接收标识(ACK ),且不需要重传; 如果不能够成功地解码, 则反馈错误接收标识 (NACK ), 通过该信息要求 发送端重传数据。 可见, HARQ技术可以提高系统的性能, 并灵活地调整码 元速率。
需要说明的是, HARQ技术结合了自动重传技术和前向纠错编码技术来 检测错误并进行纠正。 目前, HARQ有三种模式: 第一类是接收端丟弃无法 成功解码的子包( sub-packet ),通过反馈信道通知发送端重传原始信号的拷 贝; 第二类是接收端保存无法成功解码的子包, 通过反馈信道通知发送端 重传原始信号的拷贝,通常这种方式称为追赶合并( CC, Chase Combining ) 方式; 第三类是接收端保存无法成功解码的子包, 通过与重传子包合并完 成解码, 重传子包可以与之前的子包相同, 也可以不同, 通常这种方式称 为递增冗余 ( IR, Increment Redundancy )方式。
其中, 通过重传更多的冗余信息来获得较大的编码增益的递增冗余方 式得到越来越多公司的关注,各大标准组织纷纷将其列为 HARQ技术的主要 实现手段。 递增冗余技术通过将卷积码、 或 turbo码、 或低密度奇偶校验码 后的比特按照特定规则分成若干个子包, 编号分别为 SPO, SP1 , SPN。 通常, 子包 SP0中包含系统比特信息, 所以在下行方向上, 基站为终端指配 下行资源后, 在利用该下行资源为该终端首传数据包时要传输 SP0子包, 以 保证在信道条件允许的情况下终端可以尽可能快的成功解码; 在发生重传 时, 基站可以随意选择重传的子包进行重传。 需要指出的是, 本文中所述 系统比特信息是指基站要通过 HARQ包发送给终端的实际的数据比特信息, 也可以称为业务数据, 其中, 所述系统比特信息不包括釆用不同编码方式 产生的冗余比特信息。 例如: 对于语音业务, 系统比特信息是指发送给接 收端的语音数据比特。
然而, 当基站为终端指配用于传输数据包的下行资源时, 可能会出现 基站没有接收到终端反馈的任何关于 HARQ包接收成功与否的反馈信息的 异常情况, 这样, 根据 HARQ机制将导致第一次重传, 但此时如果让基站随 意选择子包重传, 将影响终端解码成功率, 并且, 根据 HARQ机制将会导致 多次重传, 由此降低系统频语效率。 发明内容
本发明实施例提供一种混合自动重传请求方法和基站设备, 能够解决 在基站没有接收到终端发送的任何关于数据包接收成功与否的反馈信息情 况下, 终端的数据包解码成功率低以及系统频谱效率低的问题。
为解决上述问题, 本发明实施例提供的混合自动重传请求方法, 包括: 基站为终端分配下行资源, 并利用所述下行资源, 釆用混合自动重传请求
HARQ方式, 向所述终端传输数据包的第一个子包; 如果所述基站未在设定 时长内接收到所述终端发送的关于该数据包接收成功与否的反馈信息, 则 所述基站为终端分配新的下行资源, 并利用新分配的下行资源向所述终端 重新传输所述数据包的第一个子包。
其中, 所述基站利用新分配的下行资源向所述终端重新传输所述数据 包的第一个子包后, 若在设定时长内未接收到所述终端发送的关于该数据 包接收成功与否的反馈信息, 则该方法还包括: 所述基站为所述终端再次 分配新的下行资源, 并利用该再次分配的新的下行资源向所述终端重新传 输所述数据包的第一个子包, 直到基站在设定时长内接收到所述终端发送 的关于所述数据包接收成功与否的反馈信息, 或者直到传输次数达到最大 重传次数。
上述方法中, 若所述终端在接收到所述基站重新传输的所述第一个子 包之前没有接收过所述第一个子包, 则该方法还包括: 所述终端根据接收 到的重新传输的所述第一个子包进行所述数据包的解码过程。 若所述终端 在接收到所述基站重新传输的所述第一个子包之前, 已经接收过所述第一 个子包但根据该已经接收过的第一个子包未成功解码所述数据包, 则该方 法还包括: 存储未成功解码所述数据包的第一个子包; 所述终端在接收到 重新传输的所述第一个子包之后, 根据该重新传输的第一个子包和之前因 未成功解码所述数据包而存储的第一个子包, 进行所述数据包的解码过程。
其中, 若在接收到所述重新传输的第一个子包之前, 所述终端已经接 收过所述第一个子包并根据该已经接收过的第一个子包成功解码所述数据 包, 则该方法还包括: 所述终端放弃解码所述重新传输的第一个子包, 并 且通过反馈信道发送所述数据包解码成功的反馈信息。 每次传输的所述数 据包的第一个子包都携带有所述数据包的业务数据信息。 所述重新传输的 数据包的第一个子包与前次传输的所述数据包的第一个子包所釆用的调制 编码方式相同或不同。 所述设定时长是默认配置并存储于所述基站中的, 或者是上层网络单元通过信令发送给所述基站的。
相应地, 本发明实施例还提供的基站设备, 包括: 资源指配模块, 用 于为终端分配下行资源; 数据传输模块, 用于利用为终端分配的下行资源, 釆用 HARQ方式,向所述终端传输数据包的第一个子包;反馈信息接收模块, 用于接收终端发送的关于所述数据包接收成功与否的反馈信息; 指示模块 , 用于在所述反馈信息接收模块未在设定时长内接收到所述终端发送的任何 关于所述数据包接收成功与否的反馈信息时, 指示所述资源指配模块为所 述终端分配新的下行资源, 并指示所述数据传输模块利用新分配的下行资 源向所述终端重新传输所述数据包的第一个子包。
其中, 所述数据传输模块利用新分配的下行资源重新传输所述数据包 的第一个子包后, 若所述反馈信息接收模块在设定时长内未接收到所述终 端发送的关于所述数据包接收成功与否的反馈信息, 则所述指示模块进一 步用于: 再次指示所述资源指配模块为所述终端分配新的下行资源, 并再 次指示所述数据传输模块利用该下行资源向所述终端传输所述数据包的第 一个子包, 直到所述反馈信息接收模块在设定时长内接收到所述终端发送 的关于所述数据包接收成功与否的反馈信息, 或者直到传输次数达到最大 重传次数。
上述设备中, 所述数据传输模块每次传输的所述数据包的第一个子包 都携带有所述数据包的业务数据; 或者, 所述数据传输模块重新传输所述 数据包的第一个子包之前, 釆用与前次传输所述数据包的第一个子包相同 上述基站设备还包括: 配置模块, 用于通过默认配置方式或通过接收 上层网络单元信令的方式, 配置所述设定时长。
针对现有技术中, 基站在传输数据包的第一个子包后, 未在设定时长 内接收到所述终端发送的关于数据包接收成功与否的反馈信息的异常情 况, 本发明的上述实施例通过基站为所述终端分配新的下行资源, 并利用 新分配的下行资源向所述终端传输该数据包的第一个子包。 这样就产生了 如下两方面的效果: 一方面, 基站在进行 HARQ过程中, 此时重新传输的是 数据包的第一个子包,而该第一个子包携带有系统比特信息(即业务数据)。 这样, 与现有 HARQ机制中基站随意选择子包重传相比,本发明利用新分配 的下行资源向所述终端传输该数据包的第一个子包, 能保证终端成功解码 数据包, 从而提高终端的解码成功率; 并且, 若终端成功解码数据包, 则 不再需要基站再进行重传, 进而提高了系统频谱效率。 另一方面, 针对终 端因未能获知基站此前为其分配的下行资源指示信息而导致的 HARQ过程, 终端可以在获知基站为其分配的新的下行资源指示信息后, 通过该下行资 源接收基站为其传输的该数据包的第一个子包, 从而一定程度上保证了终 端接收数据包的第一个子包的成功率, 进而可提高终端的数据包解码成功 率。 附图说明
图 1为本发明实施例一中的数据包的 HARQ流程示意图;
图 2为本发明实施例二中的数据包的 HARQ流程示意图;
图 3为本发明实施例三中的数据包的 HARQ流程示意图;
图 4为本发明实施例中基站分配的时频资源的二维分布情况示意图; 图 5为本发明实施例提供的基站设备的结构示意图。 具体实施方式
本发明的实施例对现有的 HARQ流程以及基站设备进行了改进,针对基 站没有接收到终端发送的任何关于 HARQ包接收成功与否的反馈信息的情 况, 通过改进的 HARQ流程和基站设备, 从而保证 HARQ包的成功解码, 进 而提高系统频谱效率。
需要说明的是, 所述反馈信息是关于数据包接收成功与否的信息, 如 ACK、 NACK信号; 另夕卜,所述 HARQ包是指釆用 HARQ方式传输的数据包。
需要指出的是,导致基站接收不到终端发送的任何关于 HARQ包接收成 功与否的反馈信息的原因, 可能包括:
当基站为终端指配用于传输数据包的下行资源时, 终端没有解码或无 法成功解码下行资源指示信息而导致无法获知基站为其分配的下行资源, 这样,终端自然接收不到基站为其传输的 HARQ包,也就自然不会反馈任何 关于 HARQ包接收成功与否的反馈信息; 或者,终端能够获知基站为其分配 的下行资源,也能够根据该下行资源接收并解码 HARQ包的第一个子包, 以 及发送反馈信息, 但该终端的反馈信息没有被基站接收到。
针对上述情况, 本发明分别提供了以下实施例。 下面结合附图对本发 明实施例进行详细描述。 实施例一
参见图 1 , 示出了本发明实施例一提供的一种数据包的 HARQ流程, 该 流程描述了终端不能成功接收或解码下行资源指示信息所导致的 HARQ处 理流程。 根据现有的 HARQ机制, 基站将待传输的 HARQ包按照特定规则分 成若干个子包, 编号分别为 SPO, SP1 , SPN, 其中, 该 SP0为 HARQ包 的第一个子包, 且该 SP0携带有发送给该终端的全部系统比特信息, 也就是 说,每次传输的所述第一个子包都携带有所述 HARQ包的业务数据信息。在 图 1所示的流程中, 当基站欲向终端传输一个新的数据包时,执行以下步骤: 步骤 101、 基站为终端分配下行资源, 并将分配的下行资源通知给该终 端;
该步骤中, 基站可通过发送控制信令(如资源指配消息) 的方式, 将 为终端分配的下行资源通知给终端, 发送控制信令的方式可以是单播、 组 播或广播。 发送的控制信令中携带控制信息(或称下行资源指示信息), 控 制信息中通常包括: (1 ) 为终端分配的下行资源信息以及选用的调制编码 方式信息; (2 ) 为终端分配的用来反馈数据包接收成功与否的反馈信道信 息; (3 )指示终端接收的子包为首传包或重传包的指示信息。 其中, 所述 首传包是指第一次传输的子包; 所述重传包是指重新传输的子包。
这里, 基站可以通过显式或隐式方式将为终端分配的反馈信道信息通 知给终端, 其中, 所述显示方式是指在控制信息中携带该反馈信道信息, 所述隐式方式是指在控制信息中携带该反馈信道的索引信息, 终端通过获 知该索引信息确定反馈信道信息。
所分配的下行资源可以是时频二维资源, 如时频资源块。 图 4给出了一 种基站为终端分配的时频资源的二维分布情况, 其中, C1表示基站发送的 控制信息所占用的时频资源, SP0表示基站向终端发送的 SP0子包所占用的 时频资源。
步骤 102、基站向终端发送欲传输数据包的 SP0子包, 并指示该 SP0子包 为首传包;
步骤 103、 如果终端因未获知基站为其分配的下行资源, 而导致基站在 设定时长内未接收到该终端发送的任何关于该数据包接收成功与否的反馈 信息, 则基站为该终端指配新的下行资源;
其中, 由于终端没有成功接收到基站向其发送的控制信息, 因而该终 端不会向基站发送任何该数据包接收成功与否的反馈信息, 从而导致基站 在设定时长内未接收到该终端任何关于该数据包接收成功与否的反馈信 息, 在这种情况下, 基站为该终端指配新的下行资源。 此处, 所述设定时 长是默认配置并存储于所述基站中的, 或者是上层网络单元通过信令发送 给所述基站的。
该步骤中, 由于终端未能成功接收以及解码基站为该终端分配的下行 资源指示信息, 因此不可能发送任何关于数据包接收成功与否的反馈信息
(包括 ACK和 NACK )。 而当基站在设定时长内未接收到该终端发送的任何 关于数据包接收成功与否的反馈信息时, 则为该终端分配新的下行资源, 并将新分配的下行资源通知给该终端, 其通知方式可如前述所述, 包括釆 用单播、 组播或广播的方式。 并且, 通知给终端的下行资源指示信息所包 含的内容也可如前所述, 即: 为终端分配的下行资源的位置信息以及选用 的调制编码方式信息、 为终端分配的用来反馈数据包接收成功与否的反馈 信道信息和指示终端接收的子包为首传包或重传包的指示信息。
基站可以通过在设定时长内扫描为该终端分配的反馈信道的方式确定 是否接收到该终端发送的反馈信息, 当该设定时长到达时仍未从该反馈信 道接收到终端发送的任何关于数据包接收成功与否的反馈信息时, 为该终 端指配新的下行资源。
步骤 104、 基站利用新分配的下行资源向该终端重新传输该数据包的 SP0子包, 并指示该 SP0子包为重传包;
该步骤中,基站重新发送 SP0子包所釆用的调制编码方式可以与该基站 在此之前传输该 SP0子包时所使用的调制编码方式相同,也可以不同。其中 , 该 SP0子包中携带有发送给该终端的全部系统比特信息。
步骤 105、 终端根据基站重新传输的 SP0子包成功解码数据包后, 向基 站发送该数据包成功解码的反馈信息;
其中, 终端成功接收基站为其新分配的下行资源指示信息后, 利用该 下行资源接收基站传输的 SP0子包。 终端获知该 SP0子包为重传包, 但终端 之前未接收并解码过该 SPO子包的首传包, 则根据接收到的该 SP0子包进行 数据包的解码过程, 以获取数据包中的全部数据, 并在解码后向基站发送 该数据包解码成功与否的反馈信息。
步骤 106、 基站在设定时长内收到该终端的反馈信息后, 按照 HARQ常 规流程进行后续流程。
基站在设定时长内从为该终端新分配的下行资源所指示的反馈信道接 收到该终端的反馈信息后,后续流程按照 HARQ常规流程处理,此处不再赘 述。
至此, 通过图 1所示的流程可以看出, 针对终端不能成功解码下行资源 指示信息的情况, 基站重新为该终端指配下行资源, 并利用该下行资源重 新为该终端传输 SP0子包。 这样, 与现有 HARQ机制相比, 不仅能够尽可能 地保证终端成功解码数据包, 而且还能够提高系统频谱效率。 通常, 终端 无法成功接收和解码基站分配的下行资源指示信息可能有一定的偶然性 (如因异常情况引起的信道质量下降), 针对基站再次发送的下行资源指示 信息, 终端再次接收和解码失败的可能性相对较低, 因此通过上述流程所 述的方式, 尽可能地保证了终端能够成功接收 SP0子包, 进而成功解码数据 包。
需要说明的是, 所述基站利用新分配的下行资源向所述终端重新传输 所述 HARQ包的第一个子包即 SPO子包后, 如果在设定时长内未接收到所述 终端发送的关于该 HARQ包接收成功与否的反馈信息,那么,所述基站再次 为所述终端分配新的下行资源, 并利用该下行资源向所述终端重新传输所 述 HARQ包的第一个子包 ,直到能够在设定时长内接收到所述终端发送的关 于所述 HARQ包接收成功与否的反馈信息,或者直到传输次数达到最大重传 次数。 实施例二 参见图 2, 示出了本发明实施例二提供的数据包的 HARQ流程, 该流程 描述了终端能够成功接收并解码下行资源指示信息, 而且能够成功接收和 解码 SP0子包,但由于该终端所发送的数据包成功接收与否的反馈信息没有 被基站接收到而导致的 HARQ处理流程。与前述实施例一相同的是,本实施 例二中将数据包的多个子包的编号分别描述为 SPO, SP1 , SPN, 其中 SP0子包中携带有发送给该终端的全部的系统信息比特。 在图 2所示的流程 中, 当基站欲向终端传输一个新的数据包时, 执行以下步骤:
步骤 201、 基站为终端分配下行资源, 并将分配的下行资源通知给该终 端;
该步骤中, 基站可通过发送控制信令(如资源指配消息) 的方式, 将 为终端分配的下行资源通知给终端, 发送控制信令的方式可以是单播、 组 播或广播。 发送的控制信令中携带控制信息(或称下行资源指示信息), 所 述控制信息中通常包括: (1 ) 为终端分配的下行资源的位置信息以及选用 的调制编码方式信息; (2 ) 为终端分配的用来反馈数据包接收成功与否的 反馈信道信息; (3 )指示终端接收的子包为首传包或重传包的指示信息。
步骤 202、基站向终端发送欲传输数据包的 SP0子包, 并指示该 SP0子包 为首传包;
步骤 203、 终端利用该下行资源接收 SP0子包并进行解码, 在成功解码 数据包后, 向基站发送该数据包成功解码的反馈信息;
其中, 终端成功接收基站为其分配的下行资源指示信息后, 利用该下 行资源接收基站传输的 SP0子包, 并根据该 SP0子包对该数据包进行解码。 在成功解码数据包后, 终端在反馈周期到达时, 利用基站为其分配的反馈 信道, 向基站发送该数据包的反馈信息, 如 ACK消息, 以表明终端已经成 功接收并解码数据包。
步骤 204、 若基站在设定时长内未接收到该终端发送的任何关于该数据 包接收成功与否的反馈信息, 则基站为该终端指配新的下行资源; 该步骤中, 由于网络或设备异常等原因, 导致终端发送反馈信息后基 站在设定时长内未接收到该终端发送的任何关于数据包接收成功与否的反 馈信息, 于是, 基站为该终端分配新的下行资源, 并将新分配的下行资源 通知给该终端, 所釆用的通知方式可如前所述, 且通知给终端的下行资源 指示信息所包含的内容也可如前所述。
例如: 在设定时长内, 基站可通过扫描为该终端分配的反馈信道的方 式确定是否接收到该终端发送的反馈信息, 当该设定时长到达时仍未从该 反馈信道接收到终端发送的任何关于数据包接收成功与否的反馈信息, 则 为该终端指配新的下行资源。
步骤 205、 基站利用新分配的下行资源向该终端重新传输该数据包的 SP0子包, 并指示该 SP0子包为重传包。
该步骤中,基站重新发送 SP0子包所釆用的调制编码方式可以与该基站 在此之前传输该 SP0子包时所使用的调制编码方式相同,也可以不同。其中 , 该 SP0子包中携带有发送给该终端的全部系统比特信息。
步骤 206、 终端接收到该 SP0子包后, 向基站发送该数据包成功解码的 反馈信息;
其中, 终端成功接收基站为其新分配的下行资源指示信息后, 利用该 下行资源接收基站传输来的该 SP0子包。该终端获知该 SP0子包为重传包后, 如果该终端已经在此之前接收到该 SP0子包的首传包, 且已经成功解码, 则 可直接丟弃该 SP0子包的重传包,并向基站发送该数据包成功解码的反馈信 息, 如 ACK。
步骤 207、基站在设定时长内接收到该终端的反馈信息后,则按照 HARQ 常规流程来进行后续流程。
在设定时长内, 如果基站从为该终端新分配的下行资源所指示的反馈 信道接收到该终端的反馈信息,则后续流程按照 HARQ常规流程处理,此处 不再赘述。
至此, 通过图 2所示的流程可以看出, 本实施例二针对终端所发送的数 据包成功接收与否的反馈信息没有被基站接收到而导致的 HARQ的情况,基 站重新为该终端指配下行资源, 并利用该下行资源重新为该终端传输第一 个子包即 SP0子包, 当终端获知该 SP0子包的首传包已成功解码时则丟弃该 SP0子包的重传包。 与现有 HARQ机制中基站随意选择子包重传相比, 本实 施例二能够利用新分配的下行资源向所述终端传输该 HARQ包的 SP0子包, 能保证终端成功解码 HARQ包,从而提高终端的解码成功率,进而提高系统 频语效率。 实施例三
参见图 3 , 示出了本发明实施例三提供的数据包的 HARQ流程, 该流程 描述了终端能够成功接收并解码下行资源指示信息, 能够接收 SP0子包首传 包但未能成功解码数据包所导致的 HARQ处理流程。与前述实施例相同,本 实施例中将数据包的多个子包的编号描述为 SPO, SP1 , SPN, 其中 SP0 子包中携带有发送给该终端的全部系统信息比特。 在图 3所示的流程中, 当 基站欲向终端传输一个新的数据包时, 执行以下步骤:
步骤 301、 基站为终端分配下行资源, 并将分配的下行资源指示通知给 该终端;
其中, 该步骤同前述实施例的步骤 101、 201相同。
步骤 302、基站向终端发送欲传输数据包的 SP0子包, 并指示该 SP0子包 为首传包;
步骤 303、 终端利用该下行资源接收该 SP0子包并解码, 在根据该 SP0 子包未成功解码数据包时, 向基站发送该数据包解码失败的反馈信息; 终端成功接收基站为其分配的下行资源指示信息后, 利用该下行资源 接收基站传输的 SPO子包, 并根据该 SP0子包进行解码以获取数据包中的数 据。 但是, 如果通过解码该 SP0子包没有成功获得该数据包的全部数据, 则 终端将该 SP0子包进行保存,并利用基站为其分配的反馈信道向基站发送该 数据包接收失败的反馈信息, 如 NACK消息。
步骤 304、 如果基站在设定时长内未接收到该终端发送的任何关于该数 据包接收成功与否的反馈信息, 则基站为该终端指配新的下行资源;
该步骤中, 由于网络或设备异常等原因, 终端发送反馈信息后, 基站 在设定时长内并未接收到该终端发送的任何关于数据包接收成功与否的反 馈信息, 于是, 基站为该终端分配新的下行资源, 并将新分配的下行资源 通知给该终端, 其通知方式可如前述所述, 通知给终端的下行资源指示信 息所包含的内容也可如前所述, 这里不再对此进行赞述。
例如: 在设定时长内, 基站可通过扫描为该终端分配的反馈信道的方 式来确定是否接收到该终端发送的反馈信息, 当该设定时长到达时仍未从 该反馈信道接收到终端发送的任何关于数据包接收成功与否的反馈信息, 则基站为该终端指配新的下行资源。
步骤 305、 基站利用新分配的下行资源向该终端重新传输该数据包的 SP0子包, 并指示该 SP0子包为重传包;
其中, 该 SP0子包中携带有发送给该终端的全部系统比特信息。 需要指 出的是, 该步骤中, 基站重新发送 SP0子包所釆用的调制编码方式可以与该 基站在此之前传输该 SP0子包时所使用的调制编码方式相同, 也可以不同。
步骤 306、终端根据该 SP0子包的重传包和之前存储的 SP0子包进行数据 包的解码, 并在解码成功后向基站发送数据包成功解码的反馈信息;
该步骤中, 终端获知基站为其新分配的下行资源后, 利用该下行资源 接收基站传输的该 SP0子包。 该终端获知该 SP0子包为重传包, 并且该终端 在此之前已经接收过该 SP0子包但根据该 SP0子包对数据包解码失败, 则根 据该 SPO子包的重传包和之前存储的 SP0子包数据进行数据包的解码, 并在 解码后向基站发送该数据包解码成功与否的反馈信息。
步骤 307、 如果基站在设定时长内接收到该终端的反馈信息后, 则按照 HARQ常规流程来进行后续流程。
在设定时长内, 如果基站从为该终端新分配的下行资源所指示的反馈 信道接收到该终端的反馈信息后,后续流程按照 HARQ常规流程处理,此处 不再赘述。
至此, 通过图 3所示的流程可以看出, 针对终端能够接收到 SP0子包首 传包但未成功解码的情况, 基站重新为该终端指配下行资源, 并利用该下 行资源重新为该终端传输 SP0子包, 使终端可以根据 SP0子包的重传包和首 传包进行数据包的解码,与现有 HARQ机制相比,可以提高终端的数据包的 解码成功率, 进而提高系统频谱效率。
需要强调的是, 在本发明的上述所有实施例中, 基站在利用新分配的 下行资源向该终端传输 SP0子包的首传包后, 等待接收该终端的反馈信息; 如果在设定时长内未接收到该终端在新分配的反馈信道上发送的任何关于 数据包接收成功与否的反馈信息, 则再次为该终端分配新的下行资源, 并 将再次分配的下行资源指示给该终端; 然后, 利用该再次分配的下行资源 向该终端传输该数据包的 SP0子包的重传包。 值得一提的是, 该过程可进行 多次, 直到基站在设定时长内接收到终端发送的数据包接收成功与否的反 馈信息。 其中, 此过程所进行的最大传输次数可由系统设定, 也可与 HARQ 的最大重传次数相同或不同。
需要注意的是, 如果基站通过多次资源分配以及数据重传过程而仍未 能在设定时长内接收到终端发送的任何关于数据包接收成功与否的反馈信 息的情况下, 暂时放弃向该终端传输数据包, 以等待信道条件允许的情况 下再进行数据传输。 这样, 能够避免该终端占用过多的系统资源而影响其 他终端的业务, 从而提高系统频谱效率。
在本发明上述所有实施例中, 所述的设定时长可以是缺省配置存储于 基站中的, 也可以由基站的上层网络单元确定并通过信令通知到该基站的。 基站的上层网络单元可以是基站控制器、 接入服务网、 连接服务网、 核心 网网关等。
基于相同的技术构思,本发明实施例还提供了一种基站设备。参见图 5 , 为本发明实施例提供的基站设备的结构示意图, 该基站设备包括: 常规的 接口模块, 如用于与终端进行信息交互的第一通信接口模块 501 , 用于与基 站设备的上层网络单元进行信息交互的第二通信接口模块 502, 其中, 第一 通信接口模块 501可包括: 基带单元、 射频单元等常规处理单元。
其中, 所述基站设备还包括: 资源指配模块 503、 数据传输模块 504、 反馈信息接收模块 505、指示模块 506,还可进一步包括配置模块 507 ,其中: 资源指配模块 503 , 用于为终端指配下行资源。 该资源指配模块 503为 终端分配下行资源后, 可通过第一通信接口模块 501通过广播、 组播、 单播 等方式发送携带有下行资源指示信息的消息, 以便终端能够获知基站为其 分配的下行资源;
数据传输模块 504 , 用于利用为终端指配的下行资源向该终端传输 HARQ包的第一个子包,该第一个子包中携带有向该终端发送的全部系统比 特信息 (即需要通过该 HARQ包向终端传输的所有业务数据)。 该数据传输 模块 504通过第一通信接口模块 501发送该第一个子包;
反馈信息接收模块 505 , 用于接收终端发送的关于 HARQ包接收成功与 否的反馈信息。 该反馈信息接收模块 505可通过第一通信接口模块 501扫描 为终端指配的反馈信道, 以确定是否有终端发送的数据包接收成功与否的 反馈信息;
指示模块 506, 用于在反馈信息接收模块 505未在设定时长内接收到终 端发送的任何关于 HARQ包接收成功与否的反馈信息时,指示资源指配模块 503为该终端指配新的下行资源, 并指示数据传输模块 504利用新指配的下 行资源向该终端重新传输该 HARQ包的第一个子包。 资源指配模块 503和数 据传输模块 504将按照指示模块 506的指示进行操作。
数据传输模块 504利用新指配的下行资源向所述终端传输该 HARQ包的 第一个子包后, 若反馈信息接收模块 505在设定时长内仍未接收到该终端发 送的任何关于该 HARQ包接收成功与否的反馈信息, 则指示模块 506再次指 示资源指配模块 503为该终端指配新的下行资源, 并再次指示数据传输模块 504利用该下行资源向该终端重新传输该 HARQ包的第一个子包, 直到反馈 信息接收模块 505能够在设定时长内接收到该终端发送的关于该 HARQ包接 收成功与否的反馈信息, 或者直到传输次数达到最大重传次数。
上述基站设备的配置模块 507, 用于配置所述设定时长, 其配置方式包 括: 默认配置方式或通过接收上层网络单元信令的方式。 本发明的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权 利要求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在 内。

Claims

权利要求书
1、 一种混合自动重传请求方法, 其特征在于, 该方法包括: 基站为终端分配下行资源, 并利用所述下行资源, 釆用混合自动重传 请求 HARQ方式, 向所述终端传输数据包的第一个子包;
如果所述基站未在设定时长内接收到所述终端发送的关于该数据包接 收成功与否的反馈信息, 则所述基站为终端分配新的下行资源, 并利用新 分配的下行资源向所述终端重新传输所述数据包的第一个子包。
2、 如权利要求 1所述的方法, 其特征在于, 所述基站利用新分配的下 行资源向所述终端重新传输所述数据包的第一个子包后, 若在设定时长内 未接收到所述终端发送的关于该数据包接收成功与否的反馈信息, 则该方 法还包括:
所述基站为所述终端再次分配新的下行资源, 并利用该再次分配的新 的下行资源向所述终端重新传输所述数据包的第一个子包, 直到基站在设 定时长内接收到所述终端发送的关于所述数据包接收成功与否的反馈信 息, 或者直到传输次数达到最大重传次数。
3、 如权利要求 1或 2所述的方法, 其特征在于, 若所述终端在接收到所 述基站重新传输的所述第一个子包之前没有接收过所述第一个子包, 则该 方法还包括:
所述终端根据接收到的重新传输的所述第一个子包进行所述数据包的 解码过程。
4、 如权利要求 1或 2所述的方法, 其特征在于, 若所述终端在接收到所 述基站重新传输的所述第一个子包之前, 已经接收过所述第一个子包但根 据该已经接收过的第一个子包未成功解码所述数据包, 则该方法还包括: 存储未成功解码所述数据包的第一个子包;
所述终端在接收到重新传输的所述第一个子包之后, 根据该重新传输 的第一个子包和之前因未成功解码所述数据包而存储的第一个子包, 进行 所述数据包的解码过程。
5、 如权利要求 1或 2所述的方法, 其特征在于, 若在接收到所述重新传 输的第一个子包之前, 所述终端已经接收过所述第一个子包并根据该已经 接收过的第一个子包成功解码所述数据包, 则该方法还包括:
所述终端放弃解码所述重新传输的第一个子包, 并且通过反馈信道发 送所述数据包解码成功的反馈信息。
6、 如权利要求 1或 2所述的方法, 其特征在于, 每次传输的所述数据包 的第一个子包都携带有所述数据包的业务数据信息。
7、 如权利要求 1或 2所述的方法, 其特征在于, 所述重新传输的数据包 的第一个子包与前次传输的所述数据包的第一个子包所釆用的调制编码方 式相同或不同。
8、 如权利要求 1或 2所述的方法, 其特征在于, 所述设定时长默认配置 并存储于所述基站中; 或者, 由上层网络单元通过信令发送给所述基站。
9、 一种基站设备, 其特征在于, 该基站设备包括:
资源指配模块, 用于为终端分配下行资源;
数据传输模块, 用于利用为终端分配的下行资源, 釆用 HARQ方式, 向 所述终端传输数据包的第一个子包;
反馈信息接收模块, 用于接收终端发送的关于所述数据包接收成功与 否的反馈信息;
指示模块, 用于在所述反馈信息接收模块未在设定时长内接收到所述 终端发送的任何关于所述数据包接收成功与否的反馈信息时, 指示所述资 源指配模块为所述终端分配新的下行资源, 并指示所述数据传输模块利用 新分配的下行资源向所述终端重新传输所述数据包的第一个子包。
10、 如权利要求 9所述的基站设备, 其特征在于, 所述数据传输模块利 用新分配的下行资源重新传输所述数据包的第一个子包后, 若所述反馈信 息接收模块在设定时长内未接收到所述终端发送的关于所述数据包接收成 功与否的反馈信息, 则所述指示模块进一步用于:
再次指示所述资源指配模块为所述终端分配新的下行资源, 并再次指 示所述数据传输模块利用该下行资源向所述终端传输所述数据包的第一个 子包, 直到所述反馈信息接收模块在设定时长内接收到所述终端发送的关 于所述数据包接收成功与否的反馈信息, 或者直到传输次数达到最大重传 次数。
11、 如权利要求 9或 10所述的基站设备, 其特征在于, 所述数据传输模 块每次传输的所述数据包的第一个子包都携带有所述数据包的业务数据; 或者,
所述数据传输模块重新传输所述数据包的第一个子包之前, 釆用与前 子包进行编码。
12、 如权利要求 9或 10所述的基站设备, 其特征在于, 该基站设备还包 括:
配置模块, 用于通过默认配置方式或通过接收上层网络单元信令的 方式, 配置所述设定时长。
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