WO2010130187A1 - Procédé et appareil de demande de répétition automatique hybride - Google Patents

Procédé et appareil de demande de répétition automatique hybride Download PDF

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Publication number
WO2010130187A1
WO2010130187A1 PCT/CN2010/072570 CN2010072570W WO2010130187A1 WO 2010130187 A1 WO2010130187 A1 WO 2010130187A1 CN 2010072570 W CN2010072570 W CN 2010072570W WO 2010130187 A1 WO2010130187 A1 WO 2010130187A1
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WIPO (PCT)
Prior art keywords
pilot
pilot pattern
pattern
data
identifier
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PCT/CN2010/072570
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English (en)
Chinese (zh)
Inventor
罗薇
鲁照华
刘锟
Original Assignee
中兴通讯股份有限公司
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Publication of WO2010130187A1 publication Critical patent/WO2010130187A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1893—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the present invention relates to the field of computers and communications, and more particularly to a hybrid automatic retransmission method and apparatus. Background technique
  • the receiving end needs to perform channel estimation according to the pilot signal, thereby obtaining a more accurate data signal.
  • 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 communication quality.
  • FEC Forward Error Correction
  • ARQ Automatic Repeat Request
  • the delay generated by the FEC scheme is small, the existing coding redundancy will reduce the throughput of the system; although there is no coding redundancy in the ARQ, it has a large delay and is not suitable for real-time services.
  • the combination of the two methods generates a hybrid automatic request retransmission (HARQ) technology.
  • HARQ hybrid automatic request retransmission
  • the specific implementation generally includes: The transmitting end first sends the modulated encoded data packet to the receiving end, and the receiving end Correcting and decoding the received information. If the decoding can be completed correctly, the correct receiving identifier (ACK) is fed back to the transmitting end, and no retransmission is needed. If the decoding cannot be correctly decoded, the error receiving identifier (NACK) is fed back. The information is required to retransmit the data by the sender.
  • HARQ technology can improve system performance and flexibly adjust symbol rates.
  • the original signal of each retransmission may change despite the code rate, but the density and quantity of the pilot signal are unchanged. Therefore, the time domain of the pilot after retransmission is for the channel.
  • the fading and frequency fading estimation methods are unchanged, resulting in the accuracy of channel estimation is not improved, thereby reducing the reliability of transmission.
  • Embodiments of the present invention provide a hybrid automatic retransmission method and apparatus, which can improve the reliability of transmission.
  • a method for implementing hybrid automatic retransmission at a transmitting end comprising:
  • the transmitting end performs subcarrier mapping on the pilot according to the first pilot pattern, and performs subcarrier mapping on the data, and firstly transmits the mapped pilot and data;
  • the transmitting end When receiving the error receiving identifier, the transmitting end performs subcarrier mapping on the pilot according to the second pilot pattern, and performs subcarrier mapping on the data, and transmits the mapped pilot and the retransmitted mapped data.
  • the method further includes: the transmitting end selects the first pilot pattern and the first according to the selection of the pilot pattern set and the pilot pattern in the default configuration. Two pilot patterns; or,
  • the transmitting end obtains a selection order of the pilot pattern set and the pilot pattern by using signaling sent by the upper layer network unit, and selects the first pilot pattern and the second pilot pattern when the pilot signal needs to be mapped to the subcarrier.
  • the transmitting end selects a first pilot pattern according to a default configuration, and parses an identifier of the pilot pattern from the received signaling that carries the identifier of the pilot pattern, and selects a first corresponding to the identifier of the pilot pattern.
  • Two pilot patterns or,
  • the transmitting end selects the first pilot pattern according to the default configuration, and in the case of the received error receiving identifier, selects the second pilot pattern according to the value of the channel quality fed back by the receiving end.
  • the transmitting end sends the identifier of the second pilot pattern to the receiving end by sending signaling.
  • the second pilot pattern has the same number of pilots as the first pilot pattern, and the pilot positions are different;
  • the number of pilots in the second pilot pattern is higher than The number of pilots in the first pilot pattern
  • the transmission rate required by the first type of service is higher than the transmission rate required by the second type of service.
  • the method further includes: determining, by the transmitting end, the second pilot pattern according to the fading characteristic of the channel.
  • the transmitting end when the data after the retransmission mapping receives the error receiving identifier again, further includes: the transmitting end performs subcarrier mapping on the pilot according to the third pilot pattern or the first pilot pattern, and re-pairs the data. Perform subcarrier mapping.
  • the transmitting end When the transmitting end transmits the pilot and the data by using multiple antennas, the transmitting end conducts the pilot signal according to the multiple pilot patterns in the first pilot pattern set including the first pilot pattern during the first transmission.
  • Performing subcarrier mapping performing subcarrier mapping on the pilot according to multiple pilot patterns in the second pilot pattern set including the second pilot pattern in the retransmission process; wherein the first pilot pattern set and the second The number of pilot patterns in the pilot pattern set is consistent with the number of antennas.
  • a method for implementing hybrid automatic retransmission at a receiving end comprising:
  • the receiving end parses the pilot from the received data stream according to the first pilot pattern and performs channel estimation and decoding;
  • the receiving end sends an error receiving identifier to the transmitting end if the decoding fails;
  • the receiving end parses the pilot from the retransmitted data stream according to the second pilot pattern and performs channel estimation and decoding.
  • the method further includes: the receiving end selecting the first pilot pattern and the second pilot pattern according to a selection of a pilot pattern set and a pilot pattern in a default configuration; or
  • the receiving end obtains a selection order of a pilot pattern set and a pilot pattern by using signaling sent by an upper layer network unit, and selects a first pilot pattern and a second pilot pattern when channel estimation and decoding are required; or
  • the receiving end selects a first pilot pattern according to a default configuration, and receives and carries Decoding the identifier of the pilot pattern in the signaling of the identifier of the pilot pattern, and selecting a second pilot pattern corresponding to the identifier of the pilot pattern; or
  • the receiving end selects a first pilot pattern according to a default configuration, and selects a second pilot pattern according to a current channel quality.
  • the receiving end sends the identifier of the second pilot pattern to the transmitting end by signaling.
  • the second pilot pattern has the same number of pilots as the first pilot pattern, and the pilot positions are different;
  • the number of pilots in the second pilot pattern is higher than the number of pilots in the first pilot pattern
  • the transmission rate required by the first type of service is higher than the transmission rate required by the second type of service.
  • the receiving end fails to decode the retransmitted data stream, the receiving end sends the error receiving identifier to the transmitting end again, and performs channel on the data stream that is retransmitted by the transmitting end according to the third pilot pattern or the first pilot pattern. Estimation and decoding.
  • a transmitting device includes at least a mapping module and an interface module, where
  • mapping module configured to perform subcarrier mapping on the pilot according to the first pilot pattern, and perform subcarrier mapping on the data, and perform subcarrier mapping on the pilot according to the second pilot pattern when receiving the error receiving identifier, and Perform subcarrier mapping on the data again;
  • the interface module is configured to send the mapped pilot and data, and receive the error receiving identifier, and send the mapped pilot and the retransmitted mapped data.
  • a selection module configured to select a pilot pattern from the set of pilot patterns
  • a service module is used to determine whether the data belongs to a high speed service or a low speed service.
  • the interface module is further configured to parse the identifier of the pilot pattern from the signaling, and measure and Calculating the value of the channel quality;
  • the selecting module is specifically configured to select a pilot pattern from the set of pilot patterns according to a value of the channel quality.
  • a receiving end device comprising at least a decoding module and an interface module, where
  • a decoding module configured to parse a pilot from the received data stream according to the first pilot pattern, perform channel estimation and decoding, and parse the pilot from the retransmitted data stream according to the second pilot pattern and perform channel estimation. And decoding;
  • the interface module is configured to send an error receiving identifier to the transmitting end and receive the retransmitted data stream if the decoding fails according to the first pilot pattern.
  • a generating module configured to generate signaling of an ACK, a NACK, and an identifier carrying a pilot pattern
  • a selecting module configured to select a pilot pattern from the set of pilot patterns
  • a service module is used to determine whether the data belongs to a high speed service or a low speed service.
  • the interface module is further configured to parse the identifier of the pilot pattern from the signaling, and measure and calculate a value of the channel quality;
  • the selecting module is specifically configured to select a pilot pattern from the set of pilot patterns according to a value of the channel quality.
  • the pilot maps the pilot to the subcarriers by using different pilot patterns, thereby improving the reliability of the transmission, reducing the bit error rate, and reducing the weight.
  • the number of passes saves network resources.
  • FIG. 1 is a flowchart of an embodiment of a method for implementing a transmitting end in a hybrid automatic retransmission according to the present invention
  • FIG. 2 is a flowchart of an embodiment of a method for implementing a receiving end in a hybrid automatic retransmission according to the present invention
  • 4 is a schematic diagram of an embodiment of a pilot pattern of the present invention
  • FIG. 5 is a flowchart of an embodiment of a method for determining a hybrid automatic retransmission of a pilot pattern by a transmitting end and a receiving end by using a negotiation manner;
  • FIG. 6 is a schematic diagram of an embodiment of a channel quality level and a pilot pattern according to the present invention.
  • FIG. 7 is a flowchart of an embodiment of a hybrid automatic retransmission method for determining a pilot pattern according to different services according to the present invention.
  • FIG. 8 is a schematic diagram of an embodiment of a pilot pattern of a high speed service according to the present invention.
  • FIG. 9 is a schematic diagram of an embodiment of a pilot pattern of a low speed service according to the present invention.
  • FIG. 10 is a flowchart of an embodiment of a hybrid automatic retransmission method of a MIMO system according to the present invention
  • FIG. 11 is a schematic structural diagram of a structure of a transmitting end device according to the present invention
  • FIG. 12 is a schematic diagram of an embodiment of a component structure of a transmitting end device according to the present invention.
  • FIG. 13 is a schematic structural diagram of a receiving end device according to the present invention.
  • FIG. 14 is a schematic diagram of an embodiment of a component structure of a receiving end device according to the present invention. detailed description
  • the invention uses different pilot patterns for pilot mapping and channel estimation, improves the accuracy of channel estimation, reduces the bit error rate, and improves the reliability of transmission. And data transfer efficiency.
  • both the transmitting end and the receiving end are improved.
  • the implementation process of the transmitting end and the receiving end in the hybrid retransmission process are respectively described below.
  • a method for implementing a transmitting end in a hybrid automatic retransmission includes the following steps:
  • Step 101 The transmitting end performs subcarrier mapping on the pilot according to the first pilot pattern, and performs subcarrier mapping on the data, and sends the mapped pilot and data.
  • Step 102 The transmitting end receives an error receiving identifier (NACK) sent by the receiving end.
  • NACK error receiving identifier
  • Step 103 The transmitting end performs subcarrier mapping on the pilot according to the second pilot pattern, and a logarithm According to the re-subcarrier mapping, the mapped pilot is transmitted and the mapped data is retransmitted.
  • Step 201 The receiving end parses the pilot from the received data stream according to the first pilot pattern and performs channel estimation and decoding.
  • Step 202 The receiving end sends an error receiving identifier to the transmitting end if the decoding fails.
  • Step 203 The receiving end parses the pilot from the retransmitted data stream according to the second pilot pattern and performs channel estimation and decoding.
  • the receiving end sends the correct receiving identifier (ACK) to the transmitting end when the decoding is correct.
  • the transmitter After receiving the correct reception identifier, the transmitter continues to map the pilot to the subcarrier according to the first pilot pattern and transmits.
  • the receiving end also continues to perform channel estimation and decoding on the received data stream according to the first pilot pattern.
  • the first pilot pattern and the second pilot pattern are applied synchronously by the transmitting end and the receiving end, and a preset mechanism or a negotiation process is required to ensure the synchronization process.
  • a preset mechanism or a negotiation process is required to ensure the synchronization process.
  • the first method Configure at the transmitting end and the receiving end, configure the same pilot pattern set and the selection order of the pilot pattern.
  • the transmitting end and the receiving end synchronize the pilot pattern from the pilot pattern set according to the configured selection order, and perform pilot mapping and channel estimation respectively.
  • the upper layer network unit sends signaling to the transmitting end and the receiving end, the signaling including a set of pilot patterns (or a set of identifications of pilot patterns) and a selection order of pilot patterns.
  • the transmitting end and the receiving end synchronize to select a pilot pattern from the pilot pattern set according to the selected selection order, and perform pilot mapping and channel estimation respectively.
  • the upper layer network unit is a device on the upper layer of the base station in the communication system, and may be a base station, a relay device, a base station controller, an access service network, a connection service network, or a core network gateway.
  • the third mode the transmitting end or the receiving end selects a pilot pattern according to the value of the current channel quality, performs pilot mapping or channel estimation, and notifies the selected pilot pattern (or the identifier of the pilot pattern) to the pair. end.
  • the implementation process will be described in detail below through two embodiments.
  • the pilot patterns configured on the transmitting end and the receiving end are mixed in this embodiment.
  • the process of retransmission is as follows:
  • Step 301 The transmitting end selects the first pilot pattern from the set of pilot patterns according to the configured selection of the pilot pattern set and the pilot pattern.
  • the configuration may be a default configuration; or the upper layer network unit may be configured by using signaling, and the signaling may be a broadcast message or a unicast message.
  • Step 302 The transmitting end maps the pilot to the subcarrier according to the first pilot pattern.
  • the mapped pilot subcarriers are shown as 401 in Figure 4.
  • the circle with a cross in Figure 4 represents the pilot on the subcarrier, and the blank circle represents the data on the subcarrier.
  • Step 303 The transmitting end maps the data to the subcarriers.
  • the mapped data subcarriers can be seen as shown by 401 in FIG.
  • Step 304 The transmitting end sends the data stream including the pilot and the data to the receiving end through the subcarrier.
  • Step 306 The receiving end parses the pilot according to the first pilot pattern and performs channel estimation and decoding.
  • Step 307 If the receiving end decodes successfully, send an ACK to the transmitting end.
  • the transmitting end continues to transmit subsequent data streams according to the first pilot pattern.
  • Step 308 If the receiving end fails to decode, send a NACK to the transmitting end.
  • Step 309 After receiving the NACK, the transmitting end selects the second pilot pattern from the set of pilot patterns according to the configured pilot pattern set and the selection order of the pilot pattern.
  • Step 310 The transmitting end maps the pilot to the subcarrier according to the second pilot pattern, and remaps the last transmitted data to the subcarrier.
  • the mapped pilot subcarriers are shown at 402 in Figure 4.
  • the data transmitted this time may be all of the data transmitted last time, or may be data that cannot be decoded by the receiving end, that is, part of the data transmitted last time.
  • Step 311 The transmitting end retransmits the data stream including the pilot and the data.
  • Step 312 After receiving the data stream, the receiving end selects the second pilot pattern from the pilot pattern set according to the configured pilot pattern set and the pilot pattern selection order.
  • Step 313 The receiving end parses the pilot according to the second pilot pattern and performs channel estimation and decoding.
  • the pilot pattern set includes at least two pilot patterns, and FIG. 4 provides four pilot patterns. If the receiving end fails to decode the data stream of the first retransmission, the transmitting end continues to perform pilot mapping according to the third pilot pattern (shown at 403 in FIG. 4), and retransmits the data stream for the second time. If the receiving end fails to decode the data stream of the second retransmission, the transmitting end continues to perform pilot mapping according to the fourth pilot pattern (see 404 in FIG. 4), and retransmits the data stream for the third time. If the number of retransmissions exceeds 3 times, the transmitting end may perform mapping again according to the first pilot pattern and perform the fourth retransmission, that is, repeat the selection order. Of course, the scheme is not limited thereto, and the selection order may be reconfigured. If the decoding is correct after the first retransmission, the transmitting end may perform pilot mapping according to the first pilot pattern or the second pilot pattern, and transmit the subsequent data stream.
  • the third pilot pattern shown at 403 in FIG
  • the pilot pattern provided in this embodiment increases the number of pilots while transforming the pilot position, thereby further improving the accuracy of channel estimation, thereby improving the reliability of transmission. Sex.
  • the method for determining the hybrid automatic retransmission of the pilot pattern by the transmitting end and the receiving end by negotiation is as follows:
  • Step 501 The transmitting end maps the pilot to the subcarrier according to the first pilot pattern configured by default.
  • Step 502 The transmitting end maps the data to the subcarriers.
  • Step 503 The transmitting end sends the data stream including the pilot and the data to the receiving end through the subcarrier.
  • Step 505 If the receiving end decodes successfully, send an ACK to the transmitting end. The transmitting end continues to transmit subsequent data streams according to the first pilot pattern. Step 506: If the receiving end fails to decode, measure and calculate the current channel quality value.
  • Channel quality includes Channel Quality Information (CQI) or Channel State Information (CSI).
  • Step 507 The receiving end determines the second pilot pattern according to the value of the current channel quality and the correspondence between the value of the channel quality and the pilot pattern.
  • the channel quality is divided into eight levels (0 to 7) according to the range of values of the channel quality. The lower the level, the better the channel quality, and the smaller the number of corresponding pilots.
  • the correspondence between the channel level and the pilot pattern can be seen in Figure 6, and Figure 6 provides eight pilot patterns (601 ⁇ 608).
  • the circle with a cross in Fig. 6 indicates the pilot on the subcarrier, and the blank circle indicates the data on the subcarrier.
  • Step 508 The receiving end sends a signaling of the NACK and the identifier carrying the second pilot pattern to the transmitting end.
  • Step 509 After receiving the NACK and signaling, the transmitting end parses the identifier of the second pilot pattern from the signaling, and maps the pilot to the subcarrier according to the second pilot pattern, and re-transmits the last transmitted data. Map to subcarriers.
  • Step 510 The transmitting end retransmits the data stream including the pilot and the data.
  • Step 511 After receiving the data stream, the receiving end parses the pilot according to the second pilot pattern and performs channel estimation and decoding.
  • the transmitting end may not directly use the second pilot pattern after receiving the NACK.
  • the transmitting end can measure and calculate the current channel quality according to the information fed back by the receiving end, and further determine the pilot pattern, and compare whether the determined pilot pattern and the second pilot pattern are consistent. If not, send the carrying guide to the receiving end.
  • the signaling of the identification of the frequency pattern sends the determined identifier of the pilot pattern to the receiving end.
  • the receiving end determines the pilot pattern according to the identifier in the received signaling, and performs channel estimation and decoding. If the transmitting end and the receiving end are the base station and the terminal device, the base station may carry the identifier of the pilot pattern in the control signaling, and the terminal device may carry the identifier of the pilot pattern in the feedback signaling.
  • the embodiment shown in FIG. 5 determines the pilot pattern according to the channel quality, more in line with the objective situation, and quickly determines the appropriate pilot pattern, reduces the decoding failure rate, and improves the reliability of the transmission.
  • the embodiment shown in Fig. 3 is to try a new pilot pattern again and again, and the number of retransmissions can be reduced as compared with the embodiment shown in Fig. 3.
  • the transmitting end determines the channel quality characteristic according to the obtained channel quality value, and the channel quality characteristic includes two characteristics of time domain fading and frequency domain fading, if the channel time domain fading characteristic is compared with If the frequency domain fading is more serious, the second pilot pattern used by the transmitting end is increased in frequency domain compared with the pilot of the first pilot pattern; if the channel frequency domain fading characteristic is more obvious than the time domain fading, then The second pilot pattern used by the transmitting end is increased in number in the time domain compared to the pilot of the first pilot pattern.
  • the value of the current channel quality may be measured and calculated by the receiving end, and the value of the channel quality may be transmitted to the transmitting end through the feedback channel, or the value of the current channel quality may be measured and calculated by the transmitting end.
  • the transform of the pilot pattern includes a transform of the pilot position and/or a transform of the number of pilots.
  • Different services may have different transmission rate requirements. If the pilot pattern is adapted to the requirements of different services, the reliability of the transmission can be improved without affecting the transmission rate.
  • the implementation process of the hybrid automatic retransmission method for determining the pilot pattern according to different services in this embodiment is as follows:
  • Step 701 The transmitting end maps the pilot to the subcarrier according to the first pilot pattern configured by default.
  • Step 702 The transmitting end maps the data to the subcarriers.
  • Step 703 The transmitting end sends the data stream including the pilot and the data to the receiving end through the subcarrier.
  • Step 705 If the receiving end decodes successfully, send an ACK to the transmitting end.
  • the transmitting end continues to transmit subsequent data streams according to the first pilot pattern.
  • Step 706 If the receiving end fails to decode, send a NACK to the transmitting end.
  • Step 707 After receiving the NACK, the transmitting end determines the pilot pattern set according to the service type to which the data belongs, and selects the second pilot pattern therefrom. Service types include high-speed services and low-speed services, and high-speed services require transmission rates higher than those required for low-speed services. If it belongs to the high-speed service, the transmitting end selects the second pilot pattern from the first pilot set (see FIG. 8); if it belongs to the low-speed service, the transmitting end is from the second pilot set (see FIG. 9). Select the second pilot pattern and perform pilot mapping. The pilot number of each pilot pattern in the first pilot set is unchanged, and the pilot position is changed. The number of pilots of each pilot pattern in the second pilot set is gradually increased. In Figs. 8 and 9, the circle with a cross indicates the pilot on the subcarrier, and the blank circle indicates the data on the subcarrier.
  • Step 708 The transmitting end maps the pilot to the subcarrier according to the second pilot pattern, and remaps the last transmitted data to the subcarrier.
  • Step 709 The transmitting end retransmits the data stream including the pilot and the data.
  • Step 710 After receiving the data stream, the receiving end determines a pilot pattern set according to the service type to which the data belongs, and selects a second pilot pattern therefrom. The receiving end can know the type of service to which the data belongs by using the header information of the data stream.
  • Step 711 The receiving end parses the pilot according to the second pilot pattern and performs channel estimation and decoding.
  • the above embodiments are mainly applicable to a single antenna transmission scenario.
  • the pilot conversion method can still be used to improve the reliability of transmission.
  • the implementation flow of the hybrid automatic retransmission method of the MIMO system in this embodiment is as follows.
  • the example in which two antennas are transmitted by two antennas is described as follows.
  • Step 1001 The transmitting end maps the pilot to the two pilot subcarriers according to the two pilot patterns in the first pilot pattern set.
  • Step 1002 The transmitting end maps the data to two data subcarriers respectively.
  • Step 1003 The transmitting end sends, by using the first antenna, a data subcarrier and a pilot subcarrier.
  • the first data stream, and the second data stream including the data subcarrier and the pilot subcarrier are transmitted through the second antenna.
  • Step 1004 The receiving end receives the first data stream and the second data stream by using two antennas.
  • Step 1005 The receiving end parses the pilot from the two data streams and performs channel estimation and decoding according to the two pilots in the first pilot pattern set.
  • Step 1006 The receiving end sends a NACK if at least one data stream fails to be decoded, otherwise sends an ACK.
  • Step 1007 After receiving the NACK, the transmitting end respectively maps the pilot to the two pilot subcarriers according to the two pilot patterns in the second pilot pattern set.
  • the number of pilot patterns in the first pilot pattern set and the second pilot pattern set coincides with the number of antennas. That is, a pilot pattern used in performing multiple pilot mapping processes is set in advance for each antenna; wherein, when retransmission occurs, at least one antenna has a pilot mapping pattern changed, and multiple antennas are in progress During the pilot mapping process, different pilot patterns are used.
  • Step 1008 The transmitting end maps the data to two data subcarriers respectively.
  • Step 1009 The transmitting end retransmits the first data stream and the second data stream.
  • Step 1010 The receiving end receives the first data stream and the second data stream by using two antennas.
  • Step 1011 The receiving end parses the pilot from the two data streams and performs channel estimation and decoding according to the two pilots in the second pilot pattern set.
  • the transmitting end device in this embodiment includes a mapping module 1101 and an interface module 1102.
  • the transmitting device can be a base station, a relay station, or a user equipment.
  • the mapping module 1101 is configured to map the pilot to the subcarrier according to the first pilot pattern, and map the data to the subcarrier, and when the error receiving identifier is received, map the pilot to the subcarrier according to the second pilot pattern, And remapping the data to subcarriers.
  • the interface module 1102 is configured to send a data stream including pilot and data by using a subcarrier, and receive an error receiving identifier, and retransmit the data stream including the pilot and the data by using the subcarrier.
  • the transmitting device further includes a selecting module 1103 and a service module 1104, as shown in FIG.
  • a selection module 1103 is configured to select a pilot pattern from the set of pilot patterns.
  • the service module 1104 is configured to determine whether the data belongs to a high speed service or a low speed service.
  • the interface module 1102 is further configured to parse the identifier of the pilot pattern from the signaling, and measure and calculate a value of the channel quality.
  • the selection module 1103 selects a pilot pattern from the set of pilot patterns based on the value of the channel quality.
  • the receiving end device in this embodiment includes a decoding module 1301 and an interface module 1302.
  • the receiving end device may be a base station, a relay station or a user equipment or the like.
  • the decoding module 1301 is configured to parse the pilot from the received data stream according to the first pilot pattern, perform channel estimation and decoding, and parse the pilot from the retransmitted data stream according to the second pilot pattern and perform channel Estimation and decoding.
  • the interface module 1302 is configured to send an error receiving identifier to the transmitting end and receive the retransmitted data stream if the decoding fails according to the first pilot pattern.
  • the receiving device further includes a generating module 1305, a selecting module 1303, and a service module 1304, as shown in FIG.
  • the generating module 1305 is configured to generate signaling of an ACK, a NACK, and an identifier carrying a pilot pattern.
  • Selection module 1303 is for selecting a pilot pattern from the set of pilot patterns.
  • the service module 1304 is used to determine whether the data belongs to a high speed service or a low speed service.
  • the interface module 1302 is further configured to parse the identifier of the pilot pattern from the signaling, and measure and calculate a value of the channel quality.
  • the selection module 1303 selects a pilot pattern from the set of pilot patterns based on the value of the channel quality. Storage medium.
  • the pilot maps the pilot to the subcarriers by using different pilot patterns, thereby improving the reliability of the transmission, reducing the bit error rate, and reducing the weight. The number of passes saves network resources.
  • the embodiment of the present invention provides an implementation manner of multiple selection of pilot patterns, which makes the implementation more flexible.
  • the pilot pattern is determined according to the channel quality, which is more in line with the actual situation of the network, and effectively selects a suitable pilot pattern, and further Improve the reliability of transmission.
  • the embodiment of the present invention also selects a suitable pilot pattern according to different service types, and improves the reliability of the transmission without affecting the transmission rate.
  • the embodiments of the present invention provide a solution for hybrid automatic retransmission by pilot transform in a MIMO system, which improves transmission reliability in the MIMO system.
  • the spirit and scope of the invention is intended that the present invention cover the modifications and the modifications of the invention

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de demande de répétition automatique hybride servant à améliorer la fiabilité de la transmission. Le procédé comprend les étapes suivantes : un émetteur effectue un mappage de sous-porteuses pour un pilote en fonction d'une première configuration du pilote, effectue un mappage de sous-porteuses pour les données, et envoie le pilote et les données mappés; lors de la réception d'un identifiant d'erreur de réception, l'émetteur effectue un mappage de sous-porteuses pour le pilote en fonction d'une seconde configuration du pilote et effectue de nouveau un mappage de sous-porteuses pour les données, puis envoie le pilote mappé et retransmet les données mappées; un récepteur effectue une estimation de canal et un décodage pour le flux de données reçu en fonction de la première configuration du pilote; à l'occasion d'un échec du décodage, le récepteur envoie un identifiant d'erreur de réception à l'émetteur; et le récepteur effectue une estimation de canal et un décodage pour le flux de données retransmis par l'émetteur en fonction de la seconde configuration du pilote. La présente invention concerne également des appareils servant à mettre en œuvre le procédé.
PCT/CN2010/072570 2009-05-13 2010-05-10 Procédé et appareil de demande de répétition automatique hybride WO2010130187A1 (fr)

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CN114142977B (zh) * 2020-09-04 2023-07-04 维沃移动通信有限公司 导频处理方法及相关设备
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WO2017166373A1 (fr) * 2016-04-01 2017-10-05 Huawei Technologies Co., Ltd. Système et procédé d'identification de transmission de liaison montante sans octroi assistée par pilote
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US11658788B2 (en) 2016-11-03 2023-05-23 Huawei Technologies Co., Ltd. HARQ signaling for grant-free uplink transmissions
CN114629610A (zh) * 2020-12-11 2022-06-14 维沃移动通信有限公司 导频传输方法、装置、网络侧设备及存储介质

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