WO2008148293A1 - Procédé et dispositif permettant d'effectuer une requête de répétition automatique de paquets de données dans un réseau de communication sans fil - Google Patents

Procédé et dispositif permettant d'effectuer une requête de répétition automatique de paquets de données dans un réseau de communication sans fil Download PDF

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Publication number
WO2008148293A1
WO2008148293A1 PCT/CN2008/000937 CN2008000937W WO2008148293A1 WO 2008148293 A1 WO2008148293 A1 WO 2008148293A1 CN 2008000937 W CN2008000937 W CN 2008000937W WO 2008148293 A1 WO2008148293 A1 WO 2008148293A1
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WIPO (PCT)
Prior art keywords
data packet
retransmission
target data
destination device
destination
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PCT/CN2008/000937
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English (en)
Chinese (zh)
Inventor
Liyu Cai
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Alcatel Lucent
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Publication of WO2008148293A1 publication Critical patent/WO2008148293A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems

Definitions

  • the present invention relates to a wireless communication network, and more particularly to a method and apparatus for automatically retransmitting data packets in a wireless communication network.
  • ARQ Automatic retransmission
  • FEC forward error correction coding
  • ARQ Retransmission
  • FIG. 1 is a topology diagram of a wireless non-relay communication network, which includes a base station BS1 and a plurality of mobile stations (only the mobile station MS1 and the mobile station MS2 are shown therein for the sake of brevity).
  • the target data packet (hereinafter referred to as the data packet) is sent by the source device BS1 and then reaches the destination device MSI via the wireless channel, and the MS1 verifies the incoming data packet:
  • MS1 will send a Receive Status Report message (containing ACK information and identification information of the packet) for reporting that it correctly received the packet to BS1, after which BS1 will schedule the next one.
  • the initial transmission of the packet For the sake of brevity, the above-mentioned reception status report message including ACK information is hereinafter referred to as an ACK message;
  • MS1 will send a Receive Status Report message (containing NACK information and identification information of the packet) for reporting that it did not correctly receive the packet to BS1, based on which BS1 will arrange
  • the data packet is retransmitted, for example, a corresponding time-frequency resource is determined, and the data packet is retransmitted by using the determined time-frequency resource.
  • the above-mentioned reception status report message containing NACK information is hereinafter referred to as a NACK message. It can be seen that in the existing non-relay network, the retransmission of the data packet is performed by the source device separately. Therefore, if the channel between the source device and the destination device is under the influence of fast fading or shadow for a long time, the data packet may not be correctly received by the destination device after multiple retransmissions, and the packet is discarded. .
  • FIG. 2 shows a topography of a wireless communication network in which a base station communicates with a mobile station via a primary relay station.
  • the network shown includes a base station BS2, a relay station RSI and a plurality of mobile stations (for simplicity, only mobile stations MS3 and MS4 are shown).
  • BS2 base station
  • RSI relay station RSI
  • Solution 1 The relay station does not verify the target data packet.
  • BS2 first sends the target data packet to RS1;
  • RS1 directly forwards the target data packet to MS3;
  • MS3 verifies the received target packet forwarded by RS1:
  • MS3 If the check is correct, MS3 returns an ACK to BS2;
  • MS3 returns a NACK to BS2, which will retransmit the packet, and the retransmitted packet arrives at MS3 via RS1 relay.
  • Solution 2 The relay station verifies the target data packet, and the verification is correct before forwarding.
  • BS2 first sends the data packet to RS1;
  • RS1 sends the verified packet to MS3; MS3 verifies the target packet sent by RS1:
  • MS3 will return an ACK message to BS2.
  • the ACK message is relayed by RS1;
  • MS3 returns a NACK message to BS2.
  • the NACK message is also relayed by RS1, and BS2 will allocate resources for RS1 to retransmit the data packet.
  • the RSI returns a NACK message to BS2 requesting BS2 to retransmit the packet for it.
  • RS1 sends the packet to MS3.
  • TDM Time Division Multiplexing
  • the data packet initially transmitted by BS2 arrives at MS3 via RS1 takes 2 ⁇ ; if MS3 does not correctly receive the data packet, BS2 will schedule based on the NACK message fed back by MS3. Retransmission, the retransmission of the packet will take up 2 ⁇ of transmission time.
  • the MS3 corrects the result of the retransmission data packet verification (in the case of ARQ), or the data obtained by combining the retransmission data packet with the data packet of the initial transmission. If the result of the check ( HARQ ) is correct, the total time spent transmitting the data packet is 4 ⁇ . If the result of the check performed after receiving the retransmitted data packet is incorrect, it may need to be retransmitted again. Therefore, the transmission of this packet will take more time.
  • the initial transmission of the data packet from the BS2 to the RS1 takes time; if the RS1 correctly receives the data packet, the RS1 sends the correctly received data packet to the MS3. Time.
  • the total time required for transmission of the data packet is 2T. If the RSI or MS3 does not receive the packet correctly, the retransmission triggered by this will further extend the transmission time, that is, when the retransmission is triggered, the transmission time is at least 3T.
  • the above transmission scheme brings a long time for data packet transmission in the TDM network, thereby reducing the overall transmission efficiency of the network, and is not conducive to the full utilization of the wireless resources.
  • the above problems also exist, and are more obvious because the number of relay stations is more.
  • the retransmission of the target data packet is performed separately by the source device. Summary of the invention
  • the present invention introduces a retransmission auxiliary device in a wireless non-relay network/relay network, respectively, in which the data packet is not correct by the destination device.
  • the secondary source device Upon reception, the secondary source device performs retransmission of the data packet, and correspondingly, a corresponding method and apparatus (module) for controlling the retransmission assistance device is also introduced for the base station.
  • a method for controlling automatic retransmission of a data packet in a base station of a wireless communication network includes the following steps: determining whether the destination device correctly receives the target data packet; If the destination device does not correctly receive the target data packet, control one or more retransmission auxiliary devices corresponding to the destination device to retransmit the target data packet received and saved by using a different transmission path from the destination device. Give the device of the purpose.
  • a retransmission control apparatus for controlling automatic retransmission of a data packet in a base station of a wireless communication network, wherein the first determining means is configured to determine whether the destination device is correct Receiving a target data packet; the first control device, configured to: when the destination device does not correctly receive the target data packet, control one or more retransmission auxiliary devices corresponding to the destination device to communicate with the destination device The target data packet received and saved by the different transmission paths is retransmitted to the destination device.
  • a method for assisting automatic retransmission of a data packet in a retransmission auxiliary device of a wireless communication network comprising the steps of: The target data packet received and saved by the different transmission paths of the destination device is retransmitted to the destination device that does not correctly receive the target data packet.
  • a retransmission assistance apparatus for assisting automatic retransmission of a data packet in a retransmission assistance device of a wireless communication network, characterized in that it is passed through its corresponding purpose The target data packet received and saved by the different transmission paths of the device is retransmitted to the destination device that does not correctly receive the target data packet.
  • the technical solution provided by the present invention introduces diversity gain and additional reliability in data packet retransmission for a non-relay network; in the relay network, not only diversity gain can be introduced, but also participation data can be flexibly selected. Retransmission of packets and devices that are initially transmitted to optimally utilize system resources.
  • Figure 1 shows a topology diagram of a wireless non-relay communication network
  • Figure 2 shows a topology diagram of a wireless relay communication network
  • FIG. 3 is a flow chart of a method for controlling automatic packet retransmission in a base station of a wireless communication network in accordance with an embodiment of the present invention
  • FIG. 4 is a network topology diagram of the retransmission auxiliary device provided by the present invention in the non-relay network shown in FIG. 1 according to an embodiment of the present invention
  • FIG. 5 is a diagram showing a network topology after the retransmission auxiliary device provided by the present invention is introduced in the relay network shown in FIG. 2 according to an embodiment of the present invention
  • FIG. 6 is a block diagram of a retransmission control apparatus for controlling automatic packet retransmission in a base station of a wireless communication network according to an embodiment of the present invention
  • FIG. 7 is a flow chart of a method for assisting automatic packet retransmission in a retransmission auxiliary device of a wireless communication network according to an embodiment of the present invention
  • Figure 8 is a block diagram of a retransmission assistance device for assisting automatic packet retransmission in a retransmission assistance device of a wireless communication network in accordance with an embodiment of the present invention.
  • FIG. 3 is a flow diagram of a method for controlling automatic packet retransmission in a base station of a wireless communication network in accordance with an embodiment of the present invention. The method is described in detail below for various network topologies.
  • the retransmission assistance device can be implemented by modifying an existing relay station (e.g., configuring a retransmission assistance device thereon), or by introducing a network device dedicated to assisting retransmission.
  • the retransmission auxiliary device XI (hereinafter referred to as XI) corresponds to MS1, that is, XI retransmits the data packet when MS1 does not correctly receive the data packet from BS1.
  • BS1 controls to transmit the data packet to MS1 and XI via different transmission paths.
  • the control in step S10 can be understood as BS1 allocates radio resources for MS1, XI and itself for the initial transmission of the data packet.
  • the packet transmitted for the first time is transmitted from BS1 to MS1 via transmission path L1, and arrives at XI via transmission path L2 different from L1.
  • the same radio resource for receiving downlink data from BS1 may be allocated to MS1 and XI by the BS1 for the initial transmission, and then the BS1 transmits the data packet downward by using the same downlink radio resource.
  • the destination device MS1 will verify the data packet (e.g., cyclic redundancy check, CRC).
  • CRC cyclic redundancy check
  • the specific check mode does not constitute a limitation on the protection scope of the present invention.
  • the verification of the target data packet refers to performing verification on the target data packet; and when the target data packet is retransmitted, The verification of the target data packet refers to performing a check on the combined result after combining the target data packet received in the retransmission with the previously received target data packet.
  • the MS1 If the verification result of the data packet by the MS1 is correct, it indicates that the MS1 correctly receives the data packet, and then the MS1 sends an ACK message to the BS1.
  • the BS1 extracts the ACK information and other corresponding information after receiving the ACK message.
  • the information e.g., the packet identification information
  • the XI also receives the ACK message, and extracts the ACK information and the packet identification information therefrom, so as to determine that the data packet has been correctly received by the MS1, and then the XI discards the received and saved in the initial transmission. A copy of the packet, and waiting to receive the next packet transmitted for the first time.
  • XI may not have the above-mentioned judgment function, but simply follow BS1 based on the judgment result. Do the scheduling and do it. Subject to a variety of factors, the channel quality between BS1 and MSI may be poor, resulting in bit errors. Therefore, the packet originally transmitted by BS1 to MS1 is not correctly received by MS1. At this time, MS1 will send NACK to BS1. Message.
  • step S12 After determining in step S11 that the MS1 has not correctly received the data packet based on the NACK message from MS1 (extracting the NACK information therein and the data packet identification and analysis), in step S12, BS1 will control XI to receive it previously via L2. And save a copy of the packet to retransmit to MS1.
  • step S12 in order to introduce a gain, BS1 and XI jointly perform retransmission of the data packet, and the joint retransmission includes the following implementation manner:
  • - BS1 and XI use the same radio resources (such as time-frequency resources) to retransmit the same data to MS1 (for example, retransmit the complete data packet to MS1 respectively), then on MS1, only need to receive the heavy Transmit packets to perform radio frequency (RF) merging or maximum ratio combining;
  • RF radio frequency
  • - BS1 and XI use the same radio resources to retransmit different data to MS1 (eg, retransmit the first part and the second part of the data packet to MS1 respectively), which can be regarded as a cooperative spatial multiplexing, then in MS1 End, it is necessary to perform spatial multiplexing detection on the received retransmitted data packet;
  • BS1 and XI After performing STBC (space time block coding) or SFBC (space frequency block coding) on the retransmitted data packet, BS1 and XI use the same radio resource to send the retransmitted data packet after the above encoding to MS1. Considering a cooperative STBC or cooperative SFBC, on the MS1 side, the corresponding retransmission data packet needs to be decoded by STBC/SFBC.
  • the above method can introduce diversity gain including at least spatial diversity gain for retransmission.
  • the description is mainly directed to a transmission scheme using the HARQ technology, that is, after the destination device demodulates the initially transmitted data packet to obtain the demodulated initial transmission data, if the verification result is incorrect, the foregoing is retained.
  • Demodulated initial transmission of data After receiving the retransmission data packet from BS1 and XI, MS 1 demodulates the retransmitted data packet to obtain demodulated retransmission data, and then demodulates the retransmitted data and the stored solution.
  • the initial transmission data of the tone is weighted and combined for verification.
  • MS1 preferably retains the demodulated retransmission data obtained by demodulating the previous (one or more) retransmission data packets and the demodulated initial transmission. Data, used to perform verification after combining with the demodulated current retransmission data.
  • MS1 checks the result of the weighted combined data correctly, it will return an ACK message to BS1, and BS1 will judge based on the message that MS1 correctly receives the target data packet after retransmission, and then schedules the next target.
  • the initial transmission of the data packet if MS1 incorrectly checks the weighted combined data, it will return a NACK message to BS1, request a second retransmission, or discard the data packet.
  • How to choose is usually determined by the specific settings of the network. For example, a retransmission threshold is set, and the transmission of the packet is abandoned when the number of retransmissions reaches the threshold.
  • XI may verify the initial transmission data packet sent by BS1 received by L2, or may not perform the above verification.
  • the case where XI does not perform verification has been disclosed by the above.
  • the XI verifies the initial transmission packet sent by the BS1 via the L2
  • the XI can rely on the saved copy of the data packet in step S12.
  • the secondary BS1 performs the retransmission of the data packet, and the specific process is the same as when the XI does not perform the verification; when the verification result of the data packet sent by the XI to the BS1 is an error, optionally:
  • - XI sends a NACK message to BS1, requesting BS1 to retransmit the data packet to it, if MS1 does not correctly receive the data packet, XI will not assist BS1 to perform retransmission of the data packet, and BS1 performs the same pass.
  • the BS1 for the uplink transmission, please refer to the description above in connection with the downlink transmission, and it should be understood that when the BS1 is used as the destination device, it will not need to rely on receiving the external ACK/NACK message to judge whether the destination device correctly receives the target data.
  • the packet itself can make the above judgment (that is, for the data packet sent by MS1, BS1 can check whether it has correctly received the data packet by checking it).
  • FIG. 5 is a diagram showing a new network topology after the introduction of the retransmission auxiliary device provided by the present invention in the relay network shown in FIG. 2 according to an embodiment of the present invention, wherein the retransmission assistance is assumed
  • the device X2 (hereinafter referred to as X2) corresponds to BS2, that is, when BS2 does not correctly receive the uplink data packet, X2 retransmits the target data packet for it.
  • BS2 may have a plurality of retransmission auxiliary devices corresponding thereto, and only X2 is shown for the sake of simplicity in the figure.
  • X2 can be obtained by modifying RS1 shown in Fig. 2.
  • MS3 moves to a location where the channel quality between MS3 and BS2 is acceptable, i.e., the channel quality allows direct communication between BS2 and MS3 without relaying.
  • BS2 can determine the channel quality by the signal strength of the ranging request it receives.
  • step S10 BS2 controls MS3 to directly transmit the data packet to X2 and BS2 via paths L3, L4, respectively.
  • step S11 BS2 will demodulate the received data packet from the initial transmission from MS3 to obtain demodulated initial transmission data, after which the demodulated initial transmission data will be verified and the inspection result obtained. , to obtain the judgment result in step S11.
  • the judgment result in the step S11 is that the data packet of the initial transmission is not positive by the BS2
  • step S12 BS2 will control MS3 to retransmit the data packet directly to BS2 via path L4, and control X2 via its transmission path L5 with BS2 (different from MS3 and The transmission path between BS2) retransmits the data packet previously received and saved to BS2.
  • X2 performs the retransmission with MS3 regardless of whether the packet is correctly received by itself.
  • BS2 may also select whether X2 is required to participate in performing retransmission of the data packet according to a reception status report message or the like from X2, for example, if X2 does not correctly receive the data packet (X2 sends a NACK message to BS2) Then, only MS3 is controlled to retransmit the data packet to BS2.
  • BS2 has a plurality of retransmission assistance devices corresponding thereto, preferably, BS2 selects those retransmission assistance devices that have correctly received the data packet to retransmit the data packet with MS3.
  • the determining manner of the retransmission auxiliary device corresponding to the destination device includes: determining a signal strength between the retransmission auxiliary device and the corresponding destination device according to the ranging signal sent by each retransmission auxiliary device. Etc.) to determine. That is, a retransmission auxiliary device having a strong signal strength with the destination device is selected as the retransmission auxiliary device corresponding thereto.
  • each retransmission auxiliary device that finally participates in the retransmission of the data packet may be further determined according to the reception status (whether or not received correctly) of the initially transmitted data packet according to each retransmission auxiliary device corresponding to the destination device.
  • uplink data transmission between MS4 and BS2 is taken as an example. It is assumed that MS4 is far away from BS2 and communicates via RS2, and it is assumed that RS2 does not verify the data packet but simply forwards it, and the retransmission auxiliary device corresponding to BS2 is X2.
  • step S10 BS2 controls MS4 to transmit the initially transmitted data packet to BS2 via L7-L6, and sends the data packet to X2 via L8.
  • BS2 may control X2 to retransmit the previously received and saved data packet to BS2 in step S12.
  • the time required for the retransmission is only T, which is reduced by half compared to the prior art (as described in the background art, requiring 2T), which is undoubtedly beneficial to improve the overall data transmission rate of the communication system.
  • the BS2 when retransmitting the data packet, controls the MS4 to transmit the retransmission data packet to the BS2 without RS2 relay (the corresponding transmission path is not shown in the figure), and controls the X2 heavy Pass the packet to get the diversity gain.
  • the BS2 controls the MS4 to transmit the initial transmission data packet to the BS2 without RS2 relay (the corresponding transmission path is not shown in the figure), and controls the MS4.
  • the control MS4 transmits the retransmission packet to the BS2 without the RS2 relay, and controls X2 to perform the retransmission with the MS4.
  • the initial transmission and the retransmission time T are respectively 2 ⁇ , which is superior to the prior art (the initial transmission and the total retransmission are at least 3 ⁇ ).
  • the optimal situation of this embodiment is as described in the preferred embodiment described above (the distance between the destination device and the source device is relatively close).
  • the retransmission assistance device 10 includes: a first control device 100, a first determination device 101, and a second control device 102. Further, the first determination device 101 includes: a receiving device 1010, an extraction device 1011, and a Second judging device 1012.
  • the retransmission assistance device can be implemented by modifying an existing relay station (e.g., by configuring a retransmission assistance device thereon), or by introducing a network device dedicated to assisting retransmission.
  • the retransmission auxiliary device XI corresponds to the MS1, that is, when the XI does not correctly receive the data packet from the BS1 (the retransmission control device provided by the present invention is configured). Retransmit the packet for it.
  • the second control device 102 controls to transmit the data packet to MS1 and XI via different transmission paths.
  • the control can be understood as BS1 allocates radio resources for MS1, XI and itself for the initial transmission of the data packet.
  • the packet transmitted for the first time is sent by BS1 to MS1 via transmission path L1, and via L1.
  • the different transmission path L2 reaches XI.
  • the second control device 102 can allocate the same radio resource for receiving downlink data from the BS1 to the MS1 and the XI for the initial transmission, and then use the same downlink radio resource by a transmitting device not shown in the figure.
  • the packet is sent down so that the XI can receive the target packet.
  • the destination device MS1 will check the data packet (for example, cyclic redundancy check, CRC).
  • CRC cyclic redundancy check
  • the specific check mode does not constitute a limitation on the scope of the present invention.
  • the verification of the target data packet refers to performing verification on the target data packet, and when the target data packet is retransmitted, the verification of the target data packet is After the target data packet received in this retransmission is merged with the previously received target data packet, the merge result is verified.
  • the MS1 If the verification result of the data packet by the MS1 is correct, it indicates that the MS1 correctly receives the data packet, and then the MS1 sends an ACK message to the BS1, and the receiving device 1010 provides the ACK message to the extracting device 101 1 after receiving the ACK message.
  • the latter extracts ACK information and other corresponding information (e.g., packet identification information) therefrom, and then the second judging device 1012 determines that the data packet has been correctly received by the MS1, and then the second control device 102 can schedule the next downlink. The initial transmission of the packet.
  • the XI also receives the ACK message (which can be implemented by the BS1 to allocate a corresponding radio resource), and extracts ACK information and other related information (eg, packet identification information) therefrom, thereby determining that the ACK message is obtained.
  • the data packet has been correctly received by MS1, and preferably, XI discards a copy of the data packet it received and saved in the initial transmission, waiting to receive the next initial transmitted data packet.
  • XI may not have the above-mentioned judgment function, but simply follow the scheduling behavior of BS1 based on the judgment result.
  • the channel quality between BS1 and MS1 may be poor, resulting in bit errors. Therefore, the packet originally transmitted by BS1 to MS1 is not correctly received by MS1. At this time, MS1 will send a NACK message to BS1. .
  • the receiving device 1010 receives the NACK message from the MS1 and supplies it to the extracting device 1011, from which the NACK information and other related information are extracted (eg, According to the packet identification information, the second judging device 1012 will thereby judge that the MS1 does not correctly receive the data packet, and provide the result of the determination to the first control device 100, and the first control device 100 will control the XI to receive it previously via L2.
  • the saved copy of the packet is then retransmitted to MS1, which is then verified by MS1.
  • BS1 and XI jointly perform retransmission of the data packet, and the joint retransmission includes the following implementation manners:
  • - BS1 and XI use the same radio resources (such as time-frequency resources) to retransmit the same data to MS1 (for example, retransmit the complete data packet to MS1 respectively), then on MS1, only need to receive the heavy Transmit packets to perform radio frequency (RF) merging or maximum ratio combining;
  • RF radio frequency
  • - BS1 and XI use the same radio resources to retransmit different data to MS1 (eg, retransmit the first part and the second part of the data packet to MS1 respectively), which can be regarded as a cooperative spatial multiplexing, then in MS1 End, it is necessary to perform spatial multiplexing detection on the received retransmitted data packet;
  • BS1 and XI After performing STBC (space time block coding) or SFBC (space frequency block coding) on the retransmitted data packet, BS1 and XI use the same radio resource to send the retransmission data packet after the above encoding processing to MS1. Considering a cooperative STBC or cooperative SFBC, on the MS1 side, the corresponding retransmission data packet needs to be decoded by STBC/SFBC.
  • the above method can introduce diversity gain including at least spatial diversity gain for retransmission.
  • MS1 After receiving the retransmission data packet from BS1 and XI, MS1 demodulates the data packet and verifies the demodulated data. If the verification result is correct, it returns an ACK message, and BS1 will judge based on the message. The MS1 correctly receives the target data packet, and then schedules the initial transmission of the next target data packet; if the verification result is incorrect, MS1 will return a NACK, request a second retransmission, or discard the data packet, and how to choose is usually determined.
  • the specific setting of the network for example, setting a retransmission threshold, and discarding the transmission of the packet when the number of retransmissions reaches the threshold).
  • XI may check the initial transmission data packet sent by BS1 received by L2, or may not perform the above verification.
  • the case where XI does not perform verification has been disclosed by the above.
  • XI checks the initial transmission packet sent by BS1 received by L2 when the verification result is correct, XI can rely on the saved copy of the data packet by the first control device. 100 performs retransmission of the data packet; when the verification result is an error, optionally:
  • - XI sends a NACK message to BS1, requesting BS1 to retransmit the data packet to it, if MS1 does not correctly receive the data packet, XI will not assist BS1 to perform retransmission of the data packet, and BS1 performs the same pass.
  • retransmission auxiliary device of the destination device is shown for the sake of simplicity, and in practical applications, it may be a more important destination device (eg, a base station or a relay station). Configure multiple retransmission aids to introduce more diversity gain and increase reliability.
  • the first judging device 101 can make the above judgment by itself (that is, for the data packet sent by the MS1, the BS1 can check whether it has correctly received the data packet by checking it).
  • FIG. 5 is a schematic diagram showing a network topology after the retransmission auxiliary device provided by the present invention is introduced in the relay network shown in FIG. 2 according to an embodiment of the present invention, wherein the retransmission auxiliary device X2 is assumed.
  • X2 Corresponding to BS2 (provided with the retransmission control device provided by the present invention), that is, when BS2 does not correctly receive the uplink data packet, X2 retransmits the target data packet for it.
  • BS2 may have a plurality of retransmission auxiliary devices corresponding thereto, and only X2 is shown for the sake of simplicity.
  • the uplink data transmission between MS3 and BS2 is taken as an example.
  • X2 can be obtained by modifying RS1 shown in Fig. 2.
  • MS3 moves to a location where the channel quality between MS3 and BS2 is acceptable, i.e., the channel quality allows direct communication between BS2 and MS3 without relaying.
  • BS2 can determine the channel quality by the signal strength of the ranging request it receives.
  • the second control means 102 controls MS3 to directly transmit the data packets to X2 and BS2 via paths L3, L4, respectively.
  • BS2 will demodulate the received data packet from the initial transmission from MS3 to obtain demodulated initial transmission data, after which the demodulated initial transmission data will be verified and the inspection result obtained.
  • the first judging device 101 thereby obtains a judgment result as to whether the BS 2 correctly receives the data packet.
  • the first control device 100 controls the MS3 to directly transmit the data packet via the path L4. Retransmitted to BS2, and control X2 to retransmit the data packet previously received and saved to BS2 via its transmission path L5 with BS2 (different from the transmission path between MS3 and BS2).
  • X2 correctly receives the data packet, it performs retransmission of the data packet with MS3.
  • BS2 may also select whether X2 is required to participate in performing retransmission of the data packet according to a reception status report message or the like from X2, for example, if X2 does not correctly receive the data packet (X2 sends a NACK message to BS2) Then, only MS3 is controlled to jointly retransmit the data packet to BS2.
  • the first control device 100 selects those retransmission assistance devices that have correctly received the data packet to retransmit the data packet with the MS 3.
  • FIG. 6 Another embodiment of the retransmission control apparatus 10 will be described below with reference to FIG. 6 and with reference to FIG. 5 as an example in which uplink data transmission between MS4 and BS2 is taken as an example.
  • MS4 is far away from BS2 and communicates via RS2
  • RS2 does not calibrate the data packet.
  • the test is simple forwarding, and the retransmission auxiliary device corresponding to BS2 is X2.
  • the second control device 102 controls the MS 4 to transmit the initially transmitted data packet to the BS 2 via L7-L6, and transmits the data packet to X2 via L8.
  • the first control means 100 retransmits the previously received and saved packet to the BS2 by the control X2. In this way, the retransmission time is only T, which is shortened by half compared with the prior art (as described in the background art), which is undoubtedly beneficial to improve the overall data transmission rate of the communication system.
  • the first control device 100 controls the MS4 to transmit the retransmission data packet to the BS2 without RS2 relay (the corresponding transmission path is not shown in the figure), And control X2 to retransmit the packet to obtain the diversity gain.
  • the second control device 102 controls the MS4 to transmit the initial transmission data packet to the BS2 without RS2 relay (the corresponding transmission path is not shown in the figure) And control MS4 to send the packet to X2.
  • the first control device 100 controls the MS 4 to transmit the retransmission packet to the BS 2 without RS2 relay, and controls X2 to perform the retransmission with the MS 4 .
  • the initial transmission and the retransmission time T are totaled 2T, which is superior to the prior art (the initial transmission and the retransmission total time are at least 3 ⁇ ).
  • the optimal situation of this embodiment is as described in the preferred embodiment described above (the distance between the destination device and the source device is relatively close).
  • FIG. 7 is a flow chart of a method for assisting in automatic retransmission of data packets in a retransmission assistance device of a wireless communication network, in accordance with an embodiment of the present invention. The method will be described below with reference to Fig. 7 and with reference to Fig. 4.
  • step S20 XI receives the data packet sent by BS1 via L2 by using the radio resource allocated by BS1, and stores it. At the same time, BS1 also sends the same data packet to MS1 via path L1. Then, in step S21, XI determines whether the MS1 correctly receives the data packet sent by the BS1, and the determining process may be specifically implemented by receiving an ACK/NACK message from the MS1.
  • the XI will transmit it according to the retransmission indication information (for example, resource allocation information) from BS1 via a different transmission path from MS1 (the destination device corresponding to XI) (MS1)
  • MS1 the destination device corresponding to XI
  • MS1 the destination device corresponding to XI
  • the method can omit the judgment process described in step S21.
  • the XI completely relies on the scheduling (instruction information) of the BS1 to perform the operation.
  • the XI can also verify the data packet from the BS1 and inform the BS1 of the verification result.
  • the XI fails to receive the packet correctly, it will send a NACK message to BS1.
  • BS1 After learning that the XI has not received the packet correctly, BS1 will retransmit the packet by itself.
  • the MS 1 has a plurality of retransmission auxiliary devices corresponding thereto, preferably, the BS 1 selects, from among them, the retransmission assistance devices that correctly receive the initial transmission data packets sent by the BS 1 to participate in the retransmission of the data packets.
  • Figure 8 is a block diagram of a retransmission assistance device for assisting automatic packet retransmission in a retransmission assistance device of a wireless communication network, in accordance with an embodiment of the present invention. The method will be described below with reference to Fig. 8 and with reference to Fig. 4, and the retransmission assisting device XI of Fig. 4 includes the retransmission assisting device 20 shown in Fig. 8.
  • the retransmission assisting device 20 shown in Fig. 8 includes: a third judging device 200 and a controlled retransmission device 201.
  • one of the retransmission assistance devices 20 receives the data packet sent by the BS1 via L2 using the radio resource allocated by the BS1, and hands it over to an auxiliary storage device (not shown). Out) save. Thereafter, the third determining apparatus 200 determines, according to the ACK/NACK message from the MS1, whether the MS1 correctly receives the data packet sent by the BS1, wherein the radio resource used for receiving the ACK/NACK message from the MS1 should also be allocated by the BS1. Give XI.
  • the controlled retransmission device 201 According to the retransmission indication information (for example, resource allocation information) from BS1, it is received and saved via a transmission path different from MS1 (the destination device corresponding to XI) (MS1 via L1, XI via L2) The packet is retransmitted to MS1.
  • the retransmission indication information for example, resource allocation information
  • the third judging device 200 may be omitted. After receiving and storing the data packet replica, the controlled retransmission device 201 completely relies on the subsequent scheduling of the BS1 to perform subsequent operations.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Abstract

La présente invention concerne un procédé et un dispositif qui permettent de commander/faciliter une requête de répétition automatique de paquets de données, dans lesquels un dispositif source est commandé de manière à envoyer un paquet de données stipulé à un dispositif donné et un dispositif d'aide pour les requêtes de répétition pour les différents trajets de transfert, si le dispositif donné n'a pas reçu correctement le paquet de données stipulé, puis commande le dispositif d'aide pour les requêtes de répétition afin d'effectuer une requête de répétition du paquet de données stipulé qui a été reçu et stocké par des trajets de transfert différents du dispositif donné et du dispositif donné.
PCT/CN2008/000937 2007-05-30 2008-05-13 Procédé et dispositif permettant d'effectuer une requête de répétition automatique de paquets de données dans un réseau de communication sans fil WO2008148293A1 (fr)

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CN104113400B (zh) * 2013-04-18 2017-07-28 上海交通大学 双路径d2d***中的混合自动重传方法和频率调度方法
CN103428807B (zh) * 2013-08-15 2016-08-24 成都博高信息技术股份有限公司 通信中继节点的选择方法及通信中心节点、无线通信网络
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