WO2021013026A1 - 数据单元的发送方法、接收方法及装置 - Google Patents

数据单元的发送方法、接收方法及装置 Download PDF

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Publication number
WO2021013026A1
WO2021013026A1 PCT/CN2020/102263 CN2020102263W WO2021013026A1 WO 2021013026 A1 WO2021013026 A1 WO 2021013026A1 CN 2020102263 W CN2020102263 W CN 2020102263W WO 2021013026 A1 WO2021013026 A1 WO 2021013026A1
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mpdu
field
value
subframe
retransmitted
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PCT/CN2020/102263
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English (en)
French (fr)
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淦明
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华为技术有限公司
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Priority to EP20844140.2A priority Critical patent/EP3996300A4/en
Publication of WO2021013026A1 publication Critical patent/WO2021013026A1/zh
Priority to US17/579,195 priority patent/US20220149991A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • 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
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • 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
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • This application relates to the field of communication technology, and in particular to a method and device for sending, receiving, and receiving data units.
  • FEC Forward Error Correction
  • ARQ Automatic Repeat-reQuest
  • Hybrid ARQ Hybrid ARQ
  • the receiving end pre-stores the previously received data, and then when the retransmitted data is received, the previously received data and the data received during the retransmission are combined, thereby increasing the success rate of decoding.
  • HARQ Hybrid ARQ
  • the HARQ mechanism is usually used in deep fading areas or edge areas in wireless networks. This mechanism can often make the sender adopt a higher modulation and coding scheme (MCS). , Improve transmission efficiency.
  • MCS modulation and coding scheme
  • the embodiments of the present application provide a data unit method and device, which can be applied to a WLAN system, can realize HARQ transmission of the WLAN system, and improve the reliability and efficiency of transmission.
  • the technical solution is as follows:
  • a method for sending a data unit is provided, which is applied to a sending end, including: sending a first aggregate media intervention control protocol data unit A-MPDU; determining the MPDU that needs to be retransmitted in the first A-MPDU; The retransmitted MPDU is contained in the first A-MPDU subframe in the first A-MPDU; the first A-MPDU subframe includes the first MPDU delimiter, and the first MPDU delimiter includes the first EOF field and the first MPDU Length field; send the second A-MPDU, the second A-MPDU includes the second A-MPDU subframe, the second A-MPDU subframe includes the MPDU to be retransmitted and the second MPDU delimiter, the second MPDU delimiter includes The second EOF field and the second MPDU length field; the value of the second EOF field is the same as the value of the first EOF field, and the value of the second MPDU length field is the same as the value of the second MPDU length field.
  • a method for receiving a data unit includes: receiving a first aggregate media intervention control protocol data unit A-MPDU; receiving a second A-MPDU, the second A-MPDU including the second A -MPDU subframe, the second A-MPDU subframe includes the MPDU that needs to be retransmitted in the first A-MPDU; the MPDU that needs to be retransmitted is included in the first A-MPDU subframe of the first A-MPDU Frame; the first A-MPDU subframe includes the first MPDU delimiter, the first MPDU delimiter includes the first EOF field and the first MPDU length field; the second A-MPDU subframe includes the second MPDU delimiter, the second The MPDU delimiter includes a second EOF field and a second MPDU length field; the value of the second EOF field is the same as the value of the first EOF field, and the value of the second MPDU length field is the same as the value of the second MPDU length field;
  • the LLR includes a second EOF field and
  • a sending device including: a sending module, configured to send a first aggregated media intervention control protocol data unit A-MPDU; and a processing module, configured to determine the MPDU that needs to be retransmitted in the first A-MPDU
  • the MPDU that needs to be retransmitted is included in the first A-MPDU subframe in the first A-MPDU, the first A-MPDU subframe includes a first MPDU delimiter, and the first MPDU is separated
  • the symbol includes a first EOF field and a first MPDU length field;
  • the sending module is also used to send a second A-MPDU, the second A-MPDU includes a second A-MPDU subframe, the second A-MPDU
  • the MPDU subframe includes the MPDU that needs to be retransmitted;
  • the second A-MPDU subframe includes a second MPDU delimiter, and the second MPDU delimiter includes a second EOF field and a second MPDU length field;
  • the value of the second EOF field is the
  • a receiving device including: a receiving module, configured to receive a first aggregated media intervention control protocol data unit A-MPDU; the receiving module, further configured to receive a second A-MPDU, the second The A-MPDU includes a second A-MPDU subframe, and the second A-MPDU subframe includes an MPDU that needs to be retransmitted in the first A-MPDU; the MPDU that needs to be retransmitted is included in the first A-MPDU -The first A-MPDU subframe of the MPDU; the first A-MPDU subframe includes a first MPDU delimiter, the first MPDU delimiter includes a first EOF field and a first MPDU length field; the first Two A-MPDU subframes include a second MPDU delimiter, the second MPDU delimiter includes a second EOF field and a second MPDU length field; the value of the second EOF field is the same as the value of the first EOF field , The value of the second MPDU length
  • the method or device of any one of the above aspects makes the information bits when retransmitting MPDUs the same as the information bits when transmitting MPDUs before, so that the receiving end can combine or jointly decode the LLRs of the two transmitted coded bits.
  • the first A-MPDU subframe includes a first padding field
  • the second A-MPDU subframe includes a second padding field
  • the first padding field The value of is the same as the value of the second filling field.
  • the value of the retry bit in the frame header of the MPDU that needs to be retransmitted in the second A-MPDU is the same as the value of the retry bit in the first A-MPDU
  • the value of the retry bit in the frame header of the MPDU to be retransmitted is the same.
  • the value of the retry bit in the frame header of the MPDU that needs to be retransmitted is set to 0.
  • the value of the buffered service size field in the frame header of the MPDU that needs to be retransmitted in the second A-MPDU is the same as the value of the MPDU that needs to be retransmitted in the first A-MPDU.
  • the value of the buffer service size field in the frame header is the same.
  • the second A-MPDU further includes a second A-MPDU that is located after the second A-MPDU subframe.
  • the first A-MPDU further includes a first end frame padding field located after the first A-MPDU subframe, wherein the value of the second end frame padding field is the same as the value of the first The end frame padding field has the same value.
  • the first A-MPDU is carried in a first physical layer protocol data unit PPDU
  • the second A-MPDU subframe is carried in a second PPDU
  • the first PPDU includes The first Pre-FEC padding after the A-MPDU
  • the second PPDU includes the second Pre-FEC padding after the second A-MPDU: wherein the first Pre-FEC padding and the second Pre-FEC padding is the same.
  • a sending device for the sending end, comprising: a memory and a processor, the memory is coupled to the processor, the memory is used to store a computer program, the computer program includes program instructions; the processor is used to call The program instructions implement the method described in the first aspect.
  • a receiving device for the receiving end, including: a memory and a processor, the memory is coupled to the processor, the memory is used to store a computer program, and the computer program includes program instructions; The processor is used to call the program instructions to implement the data transmission method according to any one of the second aspect.
  • a computer-readable storage medium stores a computer program.
  • the computer program contains at least one piece of code.
  • the at least one piece of code can be executed by a computer to control the computer to execute The method of either aspect or the second aspect.
  • the eighth aspect provides a computer program.
  • the computer program When the computer program is executed by a computer, it is used to execute the method of the first aspect or the second aspect.
  • the computer program may be stored in whole or in part on a storage medium that is packaged with the processor, or may be stored in part or in a memory that is not packaged with the processor.
  • a chip including a processor, configured to call and execute instructions stored in the memory from a memory, so that a communication device installed with the chip executes the method of the first aspect or the second aspect.
  • a chip including: an input interface, an output interface, a processing circuit, and optionally, a memory.
  • the input interface, the output interface, the processing circuit, and the memory pass through an internal connection path.
  • the processor is used to execute the code in the memory, and when the code is executed, the processing circuit is used to execute the method of the first aspect or the second aspect.
  • a device for implementing the method in any one of the foregoing aspects.
  • the technical solution of the present application realizes the HARQ mechanism suitable for the A-MPDU structure in the WLAN system, and improves the transmission reliability and efficiency of the WLAN system.
  • Fig. 1 is a schematic diagram of an application scenario provided by an embodiment of the present application
  • Figure 2 is a schematic diagram of a frame structure of an A-MPDU provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the structure of an MPDU separator provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a flow of ending frame filling fields provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a method for retransmitting MPDUs provided by an embodiment of the present application
  • Figure 6a is a schematic structural diagram of a first A-MPDU provided by an embodiment of the present application.
  • FIG. 6b is a schematic structural diagram of a second A-MPDU provided by an embodiment of the present application.
  • Figure 7a is a schematic structural diagram of another first A-MPDU provided by an embodiment of the present application.
  • Figure 7b is a schematic structural diagram of another second A-MPDU provided by an embodiment of the present application.
  • Figure 8a is a schematic structural diagram of a first PPDU provided by an embodiment of the present application.
  • Figure 8b is a schematic structural diagram of a second PPDU provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a sending device provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a receiving device provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of another sending device provided by an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of another receiving device provided by an embodiment of the present application.
  • FEC Forward Error Correction
  • ARQ Automatic Repeat
  • Retransmission technology refers to the sending end re-sending data that has not been successfully received or correctly received by the receiving end.
  • Retransmission techniques may include ARQ and HARQ. Compared with ARQ, HARQ can further increase the success rate of retransmission data reception.
  • the HAQR technology in LTE generally includes two implementation modes: Chase Combining (CC) and Incremental Redundancy (IR).
  • Chasing combination also known as soft merger.
  • the sender will retransmit the same coded bits as the previously erroneously transmitted coded bits.
  • the retransmitted coded bits include information bits and check bits.
  • the receiving end combines the retransmitted coded bits with the received first transmitted coded bits.
  • the LLR Log-Likelihood Ratio
  • the sender will retransmit the retransmission coded bits, which are different from the previously transmitted coded bits, such as the sender retransmits additional parity bits or retransmits new ones.
  • the generated check bits, or the sender retransmits information bits and part of the check bits, or retransmits another part of the encoded codeword, where the retransmitted encoded bits may have different redundancy versions (Redundant Version).
  • the receiving end jointly decodes the original information and the additional received retransmission coded bit information. Since the number of bits retransmitted by HAQR IR is small, HARQ IR is more efficient than HARQ CC, but the coding codebook needs to be redesigned and the complexity is higher.
  • the sender sends a single data packet, and the single data packet includes only one data sub-packet, and multiple data sub-packets are not aggregated. If the data packet is sent incorrectly, received incorrectly or unsuccessfully received, the sender first encodes the data packet to be retransmitted, then scrambles the encoded bits, and then performs constellation point mapping modulation, upload frequency, etc., and finally passes The transmitting antenna sends to the receiving end.
  • the receiving end After receiving the signal, the receiving end correspondingly performs constellation point demapping and descrambling in sequence, and combines the LLR of each coded bit after descrambling with the LLR of each coded bit received last time for combined decoding or joint interpretation. Code, decode the information bits of the data packet.
  • the embodiment of the present application introduces the HARQ mechanism into the WLAN system and performs adaptive design to improve the transmission reliability and efficiency of the WLAN system.
  • the solutions of the embodiments of the present application are applicable to various wireless local area network systems, for example, the Institute of Electrical and Electronics Engineers (IEEE) 11 series of protocols, for example, the next generation protocol of the IEEE802.11ax protocol (802.11be protocol), Or, a more next-generation agreement.
  • IEEE Institute of Electrical and Electronics Engineers
  • the solution of the embodiment of the present application can be applied to the communication between the sending end and the receiving end in the aforementioned communication system.
  • the sending end and the receiving end may be wireless communication devices or chips that support wireless communication, for example, they may be access points and stations in a WLAN communication system, or chips in the access points and stations.
  • terminals and stations can also be called user terminals, user devices, access devices, subscriber stations, subscriber units, mobile stations, user agents, user equipment or other names.
  • user terminals can include various wireless communication functions.
  • Handheld devices vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of user equipment (User Equipment, referred to as UE), mobile station (Mobile station, referred to as MS), terminal (terminal) ), terminal equipment (Terminal Equipment), portable communication equipment, handsets, portable computing equipment, entertainment equipment, gaming equipment or systems, global positioning system equipment or any other suitable equipment configured for network communication via wireless media, etc.
  • Base stations or access points may include various forms of macro base stations, micro base stations, relay stations, and wireless access points.
  • the WLAN system may include multiple basic service sets (Basic Service Set, BSS).
  • the basic service set shown in Figure 1 includes access point sites (AP) and non-access point sites (None access).
  • point station, Non-AP STA point station
  • An access point type station is usually referred to as an access point, that is, AP
  • a non-access point type station is usually abbreviated as a station, that is, STA.
  • Each basic service set can include one AP and multiple STAs associated with the AP.
  • An access point is a device with a wireless transceiver function that can provide services to the site.
  • the station is a device with wireless transceiver function, which can access the wireless local area network based on the access point.
  • the sending end can be an access point or a station
  • the receiving end can also be an access point or a station. That is to say, the method of the embodiment of the present application can be used for communication between an access point and an access point, communication between an access point and a station, and can also be applied for communication between a station and a station.
  • the media access control (MAC) protocol data unit (MAC Protocol Data Unit, MPDU) is used to transfer data, control signaling, or management signaling between AP and STA.
  • the MPDU usually includes a frame header, a frame body (Frame Body), and a frame check sequence (Frame Check Sequence, FCS).
  • the frame body is used to carry the data, management information or control information passed down by the upper layer.
  • the frame body may not exist, such as confirmation frames.
  • FCS is used to verify whether the MPDU is transmitted correctly.
  • the frame header (also called MAC header, MAC header) may include a frame control (Frame Control) field, a duration or identification (Duration/ID) field, an address information field, a sequence control (Sequence Control) field, and quality of service At least one of the control (Quality of Service Control, QoS Control) field and the High Throughput Control (High Throughput Control, HT Control) field.
  • the explanation of each field may refer to the IEEE802.11 protocol.
  • the MAC header may also add other fields or give new meanings to certain fields in the existing MAC header.
  • FIG. 2 is a schematic diagram of the structure of the A-MPDU in the IEEE 802.11 standard.
  • the A-MPDU includes n A-MPDU subframes, and n is an integer greater than or equal to 1.
  • the A-MPDU may also include an end of frame (EOF) pad field located after the n A-MPDU subframes.
  • EEF end of frame
  • each A-MPDU subframe includes an MPDU delimiter (delimiter) and an MPDU.
  • the A-MPDU subframe may also include a padding field.
  • the MPDU separator is used to separate multiple aggregated MPDUs. The n A-MPDU subframes between the end frame fields are called A-MPDU pre-EOF padding.
  • the MPDU delimiter includes at least one of the EOF field, the reserved bit (reserved) field, the MPDU length (MPDU length) field, the Cyclic Redundancy Code (CRC) field, and the delimiter signature (delimiter signature) field.
  • a field The embodiment of the present application does not limit the content contained in the MPDU separator and the sequence of each field.
  • Figure 3 shows a schematic diagram of the structure of an MPDU separator.
  • the A-MPDU subframe with EOF set to 1 and MPDU length set to 0 is used to indicate the A-MPDU pre-EOF padding followed by padding, which is called EOF padding subframe, EOF padding
  • the subframe is included in the end frame padding field.
  • the end frame padding field includes at least one of the EOF padding subframe and the EOF padding byte.
  • Figure 4 shows a schematic structural diagram of an end frame padding field. As shown in Figure 4, where n is a non-negative integer. For A-MPDU subframes with EOF set to 1, and MPDU length set to not 0, there are two cases.
  • A-MPDU subframe is included in the multi-service type A-MPDU (Multi-TID A-MPDU).
  • multi-service type A-MPDU Multi-TID A-MPDU
  • single-TID A-MPDU single-TID A-MPDU
  • the management frame can be regarded as a special data frame carrying a special service type, such as service type 15.
  • the A-MPDU subframe is in Multi- TID A-MPDU or single-TID A-MPDU is the only A-MPDU subframe in the service type, which is used to request (solicit) the receiving end to respond to the single confirmation information, which can be included in the ACK frame or in Multi-site block confirmation Multi-STA Block Ack confirmation information; another situation is that EOF is set to 1, and the A-MPDU subframe with the MPDU length set to not 0 is included in the S-MPDU (or VHT single A- In MPDU), it belongs to a special single MPDU, which is used to request (solicit) the receiving end to respond to the single confirmation information.
  • FIG. 5 shows a schematic flow chart of a method for interacting with a data unit (medium access control protocol data unit, MPDU) provided by an embodiment of the present application, and the interaction flow includes:
  • the sending end sends the first aggregated media intervention control protocol data unit A-MPDU;
  • the first A-MPDU includes at least one A-MPDU subframe.
  • One A-MPDU subframe includes one MPDU, so each of at least one A-MPDU subframe includes one MPDU.
  • the number of at least one A-MPDU subframe is M, and M is a positive integer, where one A-MPDU subframe includes one MPDU, and therefore, M A-MPDU subframes include M MPDUs.
  • an A-MPDU subframe also includes: MPDU separator and padding field.
  • the structure of the MPDU separator can refer to Figure 3.
  • the first A-MPDU may further include an end frame filling field after at least one A-MPDU subframe.
  • the structure of the end frame filling may refer to FIG. 4.
  • the sending end may encapsulate the first A-MPDU in a first physical layer protocol data unit PPDU (phys protocol data unit, PPDU) and send it to the receiving end. When encapsulating, it may be after the first A-MPDU as needed. Perform physical layer bit padding, for example, pre-FEC padding and/or tail bits.
  • the coding method and coding parameters used for coding the first A-MPDU are not limited in the implementation of this application. For example, low density parity code (LDPC) and binary convolutional code (BCC) can be used for encoding.
  • LDPC low density parity code
  • BCC binary convolutional code
  • the coding parameters used in step S101 may be referred to as the first-pass coding parameters.
  • S102 Determine the MPDU that needs to be retransmitted in the first A-MPDU; the MPDU that needs to be retransmitted is included in the first A-MPDU subframe in the first A-MPDU; the first A-MPDU subframe includes the first MPDU partition
  • the first MPDU delimiter includes the first EOF field and the first MPDU length field.
  • the sending end determines the MPDU that needs to be retransmitted in the first A-MPDU, and the MPDU that needs to be retransmitted is included in the first A-MPDU subframe of the first A-MPDU.
  • the MPDUs that need to be retransmitted include N, and the N MPDUs that need to be retransmitted are respectively included in the N first A-MPDU subframes in the first A-MPDU.
  • the first A-MPDU may also include other A-MPDU subframes.
  • MPDUs in other A-MPDU subframes do not need to be retransmitted.
  • the sender can determine which MPDUs of the previously transmitted A-MPDUs need to be retransmitted based on multiple methods. For example, it can be based on the confirmation information sent by the receiving end, or it can be combined with its own business requirements, or it can be determined which MPDUs previously transmitted need to be retransmitted according to the confirmation information sent by the receiving end and its actual situation.
  • the sender determines which MPDUs need to be retransmitted based on the confirmation information fed back by the receiver. Therefore, optionally, the confirmation information fed back by the receiving end is used to indicate to the sending end which MPDUs of the previously transmitted A-MPDUs are received successfully.
  • the receiving end can inform the sending end through negative acknowledgment (NACK) information, or the bitmap in the Block Ack frame, or the bitmap in the Multi-STA Block Ack frame Which MPDUs were not received successfully or failed.
  • NACK negative acknowledgment
  • the MPDU that needs to be retransmitted may be the MPDU that was not successfully received by the receiver (reception failure) in the previous transmission, and the MPDU that does not need to be retransmitted may be the MPDU that was successfully received (received successfully) by the receiver in the previous transmission. Or there is no need to retransmit the incorrectly received MPDU, for example, the effective time of the MPDU is over.
  • step S102 it includes, S102a.
  • the receiving end sends confirmation information for the first A-MPDU feedback, where the confirmation information is used to indicate whether at least one MPDU in the first A-MPDU is successfully sent.
  • the confirmation information can be an acknowledgement (acknowledge, ACK) or a block acknowledgement (block acknowledgement, BA).
  • the receiving end receives the confirmation message.
  • the sender determines which MPDUs in the first A-MPDU failed to be sent, thereby determining the MPDU that needs to be retransmitted. For example, if N MPDUs in the M MPDUs of the first A-MPDU fail to be sent, where N is an integer greater than or equal to 1 and less than or equal to M, the sender determines that there are N MPDUs that need to be retransmitted.
  • step S102 after determining the MPDUs that need to be retransmitted, the sender retransmits these MPDUs in the second A-MPDU.
  • the transmitting end sends a second A-MPDU, the second A-MPDU includes a second A-MPDU subframe, and the second A-MPDU subframe includes an MPDU to be retransmitted and a second MPDU delimiter, and the second MPDU delimiter Including the second EOF field and the second MPDU length field;
  • the value of the second EOF field is the same as the value of the first EOF field, and the value of the second MPDU length field is the same as the value of the second MPDU length field.
  • a second A-MPDU includes an MPDU that needs to be retransmitted.
  • the second A-MPDU may also include other A-MPDU subframes.
  • Each subframe in the second A-MPDU may also include an MPDU delimiter and a padding field.
  • the structure of the MPDU delimiter may refer to FIG. 3, and the structure of the padding field may refer to FIG. 4.
  • the second MPDU separator is the same as the first MPDU separator, that is, the value of any field in the second MPDU separator is the same as the value of the corresponding field in the first MPDU separator.
  • the retransmitted MPDU includes a MAC header
  • the value of each field in the MAC header should also be set to the value of each field in the MAC header of the MPDU in the first A-MPDU the same.
  • the MPDU may also include an encryption header field.
  • the value of the encryption header field when the MPDU is retransmitted must also be the same as the value of the encryption header field when the MPDU was previously transmitted.
  • CBC-MAC cipher-block chaining message authentication code
  • CCMP CCMP header
  • the MPDU may be called a CCMP MPDU.
  • the CCMP MPDU also includes a message integrity code (message integrity codes, MIC) field.
  • the CCMP header is 8 bytes and the MIC field is 16 bytes.
  • the CCMP header field includes a packet number (packet number, PN), which is composed of an initialization vector (extensing initialization vectors, ExtIV) indication and a key ID (Key ID) subfield.
  • packet number packet number
  • PN packet number
  • ExtIV initialization vector
  • Key ID key ID
  • the encryption header is the GCMP header (GCMP Header)
  • the MPDU can be called GCMP MPDU
  • GCMP MPDU also Including the MIC field
  • the GCMP header is 8 bytes
  • the MIC is 16 bytes.
  • the GCMP header includes PN, and there is an Extensing Initialization Vectors (ExtIV) indication and a Key ID subfield. In the GCMP header, the ExtIV indication is always set to 1.
  • the first A-MPDU subframe includes a first padding field
  • the second A-MPDU subframe includes a second padding field
  • the value of the first padding field is the same as the value of the second padding field.
  • the value of the retry bit in the frame header of the MPDU that needs to be retransmitted in the second A-MPDU is the same as the value of the retry bit in the MAC header of the MPDU that needs to be retransmitted in the first A-MPDU.
  • the value of the retry bit in the MAC header of the MPDU that needs to be retransmitted is set to 0, and optionally, the MAC header of the MPDU that needs to be retransmitted in the second A-MPDU
  • the value of the medium buffer service size field is the same as the value of the buffer service size field in the MAC header of the MPDU that needs to be retransmitted in the first A-MPDU.
  • the retry bit is included in the frame control field of the MAC header, and the buffer service size field may be included in the HT-Control field (referred to as the A-control field in 802.11ax) or the QoS control field in the MAC header.
  • the sending end may encapsulate the second A-MPDU in a second physical layer protocol data unit PPDU and send it to the receiving end.
  • the parameters for encoding the second A-MPDU in step S103 are called retransmission encoding parameters.
  • the encoding method and encoding parameters used for encoding the second A-MPDU are the same as the encoding methods and encoding parameters used during encoding of the first A-MPDU or have a preset relationship.
  • the coding parameters include: a code rate, and a generator matrix corresponding to the code rate; optionally, a puncturing mode is also included.
  • the retransmission coding parameters are the same as the first transmission coding parameters, which may refer to: the code rate, and the generator matrix corresponding to the code rate is the same.
  • the coding parameters include the puncturing mode, the retransmission and The punching pattern of the first pass is also the same.
  • the preset relationship between the retransmission coding parameters and the first transmission coding parameters refers to: the code rate, and the corresponding generator matrix of the code rate is the same.
  • the coding parameters include the puncturing mode, the retransmission and the first transmission
  • the coded bits obtained by retransmitting the puncturing mode and the coded bits obtained by transmitting the puncturing mode first can be combined into the coded bits obtained after the new puncturing mode.
  • performing LDPC encoding on the second A-MPDU subframe during retransmission includes but is not limited to the following two methods:
  • the correctly received information bits in the LDPC codeword corresponding to the MPDU to be retransmitted or the MPDU to be continuously retransmitted are punctured, that is, deleted. It is worth noting that this application does not limit how to obtain the LDPC codeword corresponding to the MPDU with retransmission or the MPDU that is continuously to be retransmitted.
  • the LDPC codeword may be previously stored or based on the use of the MPDU to be retransmitted. The same parameters are regenerated by LDPC encoding.
  • the information bits contained in the LDPC codeword corresponding to the MPDU to be retransmitted or the continuous MPDU to be retransmitted generate new check bits, which are combined with the corresponding information bits to form a new LDPC codeword.
  • the set of information bits contained in the new LDPC codeword (including the number of bits and the corresponding bits) is the same as the set of information bits contained in the LDPC codeword that was erroneously transmitted last time.
  • the initial transmission and retransmission are LDPC codewords are generated using the same parent LDPC codebook, that is, the information bits contained in the initially transmitted and retransmitted LDPC codewords are the same, and the check bits are different subsets (different sub-sets) of the check bits of the parent LDPC codeword. Sets can overlap).
  • the bits included in the second A-MPDU subframe are encoded as information bits.
  • puncturing can be performed, and information bits can be punctured.
  • the check bit can be punched.
  • performing BCC encoding on the second A-MPDU subframe during retransmission includes but is not limited to the following two methods:
  • the second A-MPDU subframe corresponding to a single MPDU to be retransmitted or at least two consecutive MPDUs to be retransmitted adopts the retransmission coding parameters (including the code rate and the number of generators corresponding to the code rate) Matrix, and optional punching mode), BCC encoding.
  • the retransmission coding parameter is the same as the first transmission coding parameter or has a preset relationship.
  • the code rate used for the retransmission and the previous transmission is the same, and the generating multiple matrix corresponding to the code rate is the same.
  • BCC coding parameters include a code rate, a matrix of multiple generations, and optionally, a puncturing mode.
  • a code rate corresponds to one generator multinomial matrix
  • the BCC encoding parameters can optionally include puncturing mode.
  • each bit rate can correspond to different generating multiple matrices and puncturing modes.
  • the preset relationship between the retransmission coding parameters and the first transmission coding parameters refers to: the code rate used in the retransmission and the previous transmission, the corresponding multinomial matrix of the code rate is the same, and the puncturing mode used in the retransmission is the same as the previous transmission. There is a preset relationship in the punching mode used.
  • the embodiment of this application proposes that the retransmitted MPDU needs to have the same content as the previously transmitted MPDU, and the MPDU delimiter and padding field included in the A-MPDU subframe in which the retransmitted MPDU is located also need to be the same as those previously transmitted.
  • the values of the MPDU separator field and the padding field are the same, and the values of the EOF and MPDU length subfields included in the MPDU separator field are consistent.
  • S104 Perform combined decoding or joint decoding on the LLR of the coded bits corresponding to the first A-MPDU subframe and the LLR of the coded bits corresponding to the second A-MPDU subframe to obtain the required The retransmitted MPDU.
  • the receiving end combines and decodes the LLR of the coded bit corresponding to the second A-MPDU subframe in the second A-MPDU and the LLR of the coded bit of the first A-MPDU subframe in the first A-MPDU. Or joint decoding to obtain the information bits of the A-MPDU subframe, thereby obtaining the MPDU that needs to be retransmitted, so that the previously erroneously transmitted MPDU is successfully received, and the transmission reliability is improved.
  • LDPC encoding is used.
  • the receiving end combines the LLR of the LDPC codeword corresponding to the second A-MPDU subframe and the LLR of the LDPC codeword corresponding to the first A-MPDU subframe. code.
  • the receiving end will jointly decode the LLR of the LDPC codeword corresponding to the second A-MPDU subframe and the LDPC codeword corresponding to the first A-MPDU subframe.
  • Another way is to use BCC coding.
  • the receiving end will combine and decode the LLR of the BCC coded bit corresponding to the second A-MPDU subframe and the LLR of the BCC coded bit corresponding to the first A-MPDU subframe.
  • the receiving end will jointly decode the LLR of the BCC coded bit corresponding to the second A-MPDU subframe and the LLR of the BCC coded bit corresponding to the first A-MPDU subframe.
  • the first A-MPDU also includes the first end frame padding field after the first A-MPDU subframe, then the second end frame padding The value of the field is the same as the value of the filling field of the first end frame.
  • the physical layer padding bits filled after the second A-MPDU also need to be the same as the physical layer padding bits after the last first A-MPDU.
  • the layer padding bits have the same value.
  • the first PPDU carrying the first A-MPDU subframe may also include the first Pre-FEC padding after the first A-MPDU, and the second PPDU carrying the second A-MPDU subframe
  • the PPDU may include a second Pre-FEC padding located after the second A-MPDU, where the first Pre-FEC padding and the second Pre-FEC padding are the same.
  • the first PPDU may also include a first tail bit located after the first A-MPDU
  • the second PPDU may also include a second tail bit located after the second A-MPDU, where the value of the second tail bit is the same as the value of the first tail bit.
  • the value of the tail bit is also the same.
  • the sender when retransmitting, will include the value of the relevant field in the A-MPDU subframe to which the retransmitted MPDU belongs and the value of the relevant field in the A-MPDU subframe to which the MPDU belongs to the previous transmission.
  • the value is set to the same so that the information bits are the same, so that the receiving end can combine or jointly decode the LLR of the coded bits of the previously transmitted A-MPDU subframe and the coded bit LLR of the retransmitted A-MPDU subframe at this time, thereby Improve transmission reliability and efficiency. Otherwise, because the information bits are different, the LLRs of the coded bits of the A-MPDU subframes of the same MPDU transmitted before and after cannot be combined or jointly decoded.
  • the solution of the embodiment of the present application realizes the HARQ mechanism suitable for the structure of the A-MPDU in the WLAN system.
  • Fig. 6a shows a schematic structural diagram of a first A-MPDU
  • Fig. 6b shows a schematic structural diagram of a second A-MPDU.
  • the sender sends a single service type S-MPDU (first A-MPDU, as shown in Figure 6a) on the channel, including A-MPDU subframe 1, but in A-MPDU subframe 1.
  • first A-MPDU as shown in Figure 6a
  • second A-MPDU as shown in Figure 6b
  • the EOF should be set to 0.
  • the EOF setting of the MPDU delimiter of the A-MPDU subframe 1 in the second A-MPDU does not follow the setting of 802.11ax and previous protocols, but the A-MPDU of the second A-MPDU is set -The value of EOF in MPDU subframe 1 is set to be the same as the value of EOF in A-MPDU subframe 1 in the first A-MPDU.
  • the value of the MPDU length field in the MPDU delimiter of A-MPDU subframe 1 in the second A-MPDU also needs to be the same as the MPDU length field in the MPDU delimiter of A-MPDU subframe 1 in the first A-MPDU. The values are the same.
  • the content of the MPDU contained in the retransmitted A-MPDU subframe may be part of the previously failed MPDU.
  • a different pre-designed redundancy version is transmitted during each retransmission;
  • the padding field in the A-MPDU subframe 1 also needs to be the same as the value of the padding field in the A-MPDU subframe 1 that was erroneously transmitted last time.
  • Fig. 7a is a schematic structural diagram of another first A-MPDU
  • Fig. 7b is a schematic structural diagram of another second A-MPDU.
  • the sender sends the multi-service type aggregate media intervention control data unit Multi-TID A-MPDU (multiple traffic ID A-MPDU, muti-TID A-MPDU) on the channel.
  • the service type includes TID1 and TID2, as shown in Figure 7a below, is Multi-TID A-MPDU (first A-MPDU).
  • TID1 and TID2 are Multi-TID A-MPDU (first A-MPDU).
  • the EOF setting of the MPDU delimiter of A-MPDU subframe 1 in the second A-MPDU does not meet the setting of 802.11ax and previous protocols, but in order to support HARQ transmission, the A-MPDU in the second A-MPDU
  • the EOF setting of subframe 1 is the same as the value of EOF of A-MPDU subframe 1 in the first A-MPDU.
  • the value of the MPDU length field in the MPDU delimiter of A-MPDU subframe 1 in the second A-MPDU also needs to be the same as the MPDU length field in the MPDU delimiter of A-MPDU subframe 1 in the first A-MPDU. The values are the same.
  • the MPDU content included in the retransmitted A-MPDU subframe may be a part of the previously failed MPDU.
  • a different pre-designed redundancy version is transmitted during each retransmission.
  • the padding field in the A-MPDU subframe 1 also needs to be the same as the value of the padding field in the A-MPDU subframe 1 that was transmitted incorrectly last time.
  • Fig. 6a, Fig. 6b and Fig. 7a, Fig. 7b only show the case of retransmitting one MPDU.
  • the scheme of the embodiment of this application can also be applied to the case of retransmitting multiple MPDUs, and is not limited to Fig. 6a, Fig. 6b and Figure 7a, Figure 7b example.
  • Figure 8a is a schematic diagram of a first PPDU
  • Figure 8b is a schematic diagram of a second PPDU.
  • the second A-MPDU includes all MPDUs in the first A-MPDU.
  • the value of the end frame padding field of the second A-MPDU also needs to be consistent with the value of the end frame padding field of the first A-MPDU.
  • the physical layer padding bits that may be included after the second A-MPDU also need to be the same as The values of the physical layer padding bits included after the first A-MPDU are consistent.
  • the second A-MPDU may be The included physical layer padding bits also need to be consistent with the value of the physical layer padding bits included after the first A-MPDU.
  • the first PPDU can also include Pre-FEC padding and/or packet extension after the A-MPDU, where the duration of Pre-FEC padding can be It is one-quarter (1/4) OFDM symbol duration, one-half (1/2) OFDM symbol duration or three-quarter (3/4) OFDM symbol duration, and the duration of packet expansion can be 4 ⁇ s, 8 ⁇ s or 16 ⁇ s.
  • the value of the Pre-FEC padding field included in the second PPDU also needs to be set to be consistent with the value of the Pre-FEC padding in the first PPDU.
  • the EOF value of the A-MPDU subframe to which each retransmitted MPDU belongs and the value of the MPDU length field also needs to be set to be the same as the previous value.
  • the specific settings can refer to the description of the foregoing embodiment.
  • control information carried in the MAC header may be set differently, such as the setting of the retry bit value of the frame control field in the MAC header. In the previous transmission, the retry bit is set to 0, and the retry bit is indicated as 1 in the retransmission. .
  • the size of the buffer service carried in the HT-control field (called A-control in 802.11ax) or the QoS control field in the MAC header is passed through the HT-control field in the MAC header (called A-control in 802.11ax) during the previous transmission.
  • the size of the buffer service indicated in the A-control or QoS control field may be X bytes, but when it comes to retransmission, the HT-control field (called A-control in 802.11ax) or QoS control field in the MAC header
  • the size of the indicated buffer service may be Y bytes.
  • the MAC header of the retransmitted MPDU The content should be the same as the content carried in the MAC header of the MPDU transmitted in error last time, including the retry bit of the frame control field, the HT-control field (called A-control in 802.11ax) or the buffer service carried in the QoS control field Size field etc.
  • the values of certain fields may be set to be different from the values of these fields when the MPDU was previously transmitted. Then, in the embodiment of this application, , These fields need to be set the same to ensure that the value of the retransmitted information bit is the same as the value of the previously transmitted information bit, and to ensure that the receiving end can implement joint decoding or combined decoding, thereby realizing the HARQ mechanism.
  • FIG. 9 is a schematic structural diagram of a sending device provided by an embodiment of the present application.
  • the sending device can be used at the sending end or a chip in the sending end.
  • the sending device 900 includes a processing module 901, a sending module 902, and a receiving module 903. .
  • the sending device can be used to perform any function of the sending end mentioned above, for example:
  • the processing module 901 is used to determine the MPDU that needs to be retransmitted in the first A-MPDU, for example, to perform the aforementioned S102, or; the processing module 901 is also used to encode the first A-MPDU, or the processing module 901 also Used to encode the second A-MPDU.
  • the sending module 902 is used to send the first A-MPDU and the second A-MPDU, for example, to perform S101 and S103.
  • the receiving module 903 is configured to receive confirmation feedback information, and the confirmation feedback information is used to indicate which MPDUs in the first A-MPDU have not been successfully received, for example, used to perform S102a.
  • the sending device 900 further includes a storage module 904 for storing instructions.
  • the sending device 900 is a chip in the sending end, the sending module is an input interface, the receiving module is an output interface, and the processing module is a processing circuit.
  • the input interface and output interface are used to realize communication between the chip and other devices.
  • the processing circuit is used to process the signaling or data, for example, for sending (outputting) the first A-MPDU and the second A-MPDU, for receiving (input) confirmation information, and the processing circuit It is used to determine which MPDUs in the first A-MPDU need to be retransmitted according to the confirmation information.
  • the device installed with the chip can implement the methods and functions related to the sending end in the foregoing embodiments.
  • the data transmission device shown in FIG. 9 is taken as an example to describe each module in the data transmission device used at the sending end.
  • FIG. 10 is a schematic structural diagram of a receiving device provided by an embodiment of the present application.
  • the receiving device 1000 can be used at the receiving end or a chip in the receiving end.
  • the receiving device 1000 includes a processing module 1001, a sending module 1002, and a receiving module 1003.
  • the receiving device can be used to perform any function of the aforementioned receiving end, for example:
  • the processing module 1001 is used to determine whether which MPDUs in the first A-MPDU are successfully transmitted; the processing module 1001 is also used to determine the LLR of the coding bit of the first A-MPDU subframe and the coding bit of the second A-MPDU subframe LLR performs combined decoding or joint decoding to obtain the retransmitted MPDU. For example, it is used to execute the aforementioned S104.
  • the sending module 1002 is configured to send confirmation information, for example, to perform the aforementioned S102a, where the confirmation feedback is used to indicate which MPDUs in the first A-MPDU were not successfully received.
  • the receiving module 1003 is configured to receive the first A-MPDU and the second A-MPDU, for example, to receive the information sent by S102 and S103.
  • it also includes a storage module 1004, which is used to store the LLR corresponding to the first-transfer coded bit, and optionally, it is also used to store instructions.
  • the receiving device 1000 is a chip in the receiving end
  • the sending module is an input interface
  • the receiving module is an output interface
  • the processing module is a processing circuit.
  • the input interface and output interface are used to realize communication between the chip and other devices.
  • the processing circuit is used to process signaling or data, for example, for receiving (input) the first A-MPDU and the second A-MPDU, for sending (outputting) confirmation information
  • the processing circuit It is used to determine which MPDUs in the first A-MPDU are successfully transmitted and which transmission fails according to the confirmation information.
  • the device installed with the chip can implement the methods and functions related to the receiving end in the foregoing embodiments.
  • the embodiment of the present application takes the data transmission device shown in FIG. 10 as an example to describe each module in the data transmission device used at the receiving end.
  • the sending device (used at the sending end) or the receiving device (used at the receiving end) provided in the embodiments of this application can be implemented in a variety of product forms.
  • the sending device or the receiving device can be configured as a general processing system; for example, the sending device Or the receiving device can be implemented by a general bus architecture; for example, the sending device or the receiving device can be implemented by an application specific integrated circuit (ASIC) and so on.
  • ASIC application specific integrated circuit
  • FIG. 11 shows a schematic block diagram of a sending device 1100 according to an embodiment of the present application.
  • the apparatus 1100 in this embodiment of the present application may be the transmitting end in any of the foregoing method embodiments, or may be one or more chips in the transmitting end.
  • the apparatus 1100 may be used to perform part or all of the functions of the sending end in the foregoing method embodiment.
  • the device 1100 may include a processor 1110, a baseband circuit 1130, a radio frequency circuit 1140, and an antenna 1150.
  • the device 1100 may also include a memory 1120.
  • the components of the device 1100 are coupled together through a bus 1160, where the bus system 1160 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
  • bus system 1160 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are marked as the bus system 1160 in the figure.
  • the processor 1110 may be used to control the sending end, to execute the processing performed by the sending end in the above-mentioned embodiment, and to execute the processing procedures related to the sending end in the above-mentioned method embodiments and/or other technologies used in the technology described in this application.
  • the operating system can also be run, which is responsible for managing the bus and can execute programs or instructions stored in the memory.
  • the baseband circuit 1130, the radio frequency circuit 1140, and the antenna 1150 can be used to support the sending and receiving of information between the sending end and the receiving end involved in the foregoing embodiment, so as to support wireless communication between the sending end and the receiving end.
  • the first A-MPDU or the second A-MPDU is processed by the processor 1110, and after being encapsulated into an A-MPDU according to the protocol via the baseband circuit 1130, it is then subjected to baseband processing such as scrambling and encoding
  • the radio frequency circuit 1140 performs radio frequency processing such as analog conversion, filtering, amplification, and up-conversion, it is transmitted through the antenna 1150.
  • the confirmation feedback information sent from the receiving end is received via the antenna 1150, filtered, amplified, down-converted, and digitized by the radio frequency circuit 1140, and then decoded by the baseband circuit 1130, and the data is decapsulated according to the protocol.
  • the processor 1110 performs processing to restore the definite feedback information sent by the receiving end;
  • the memory 1120 may be used to store the program code and data of the sending end, and the memory 1120 may be the storage module 1130 in FIG. 11. It is understandable that the baseband circuit 1130, the radio frequency circuit 1140, and the antenna 1150 can also be used to support the transmitter to communicate with other network entities, for example, to support the transmitter to communicate with the network element on the core network side.
  • the memory 1120 in FIG. 11 is shown as being separated from the processor 1110. However, those skilled in the art can easily understand that the memory 1120 or any part thereof may be located outside the channel resource allocation apparatus 1100.
  • the memory 1120 may include a transmission line and/or a computer product separated from the wireless node, and these media may be accessed by the processor 1110 through the bus interface 1160.
  • the memory 1120 or any part thereof may be integrated into the processor 1110, for example, may be a cache and/or a general register.
  • FIG. 11 only shows a simplified design of the sending end.
  • the sending end may include any number of transmitters, receivers, processors, memories, etc., and all sending ends that can implement the present invention are within the protection scope of the present invention.
  • FIG. 12 shows a schematic block diagram of a receiving apparatus 1200 according to an embodiment of the present application.
  • the apparatus 1200 in this embodiment of the present application may be the receiving end in any of the foregoing method embodiments, or may be one or more chips in the receiving end.
  • the apparatus 1200 may be used to perform part or all of the functions of the receiving end in the foregoing method embodiments.
  • the device 1200 may include a processor 1210, a baseband circuit 1230, a radio frequency circuit 1240, and an antenna 1250.
  • the device 1200 may further include a memory 1220.
  • the components of the device 1200 are coupled together via a bus 1260, where the bus system 1260 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
  • bus system 1260 includes a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are marked as the bus system 1260 in the figure.
  • the processor 1210 may be used to control the receiving end, to perform the processing performed by the receiving end in the above-mentioned embodiment, and to perform the processing procedures related to the sending end in the above-mentioned method embodiments and/or other technologies used in the technology described in this application.
  • the operating system can also be run, which is responsible for managing the bus and can execute programs or instructions stored in the memory.
  • the baseband circuit 1230, the radio frequency circuit 1240, and the antenna 1250 can be used to support the sending and receiving of information between the receiving end and the sending end involved in the foregoing embodiments, so as to support wireless communication between the receiving end and the sending end.
  • the signal sent from the transmitting end is received by the antenna 1250, filtered, amplified, down-converted, and digitized by the radio frequency circuit, and then decoded by the baseband circuit, and then decapsulated according to the protocol. 1210 performs processing to restore the service data and signaling information sent by the sender.
  • the receiver decodes and decapsulates the received PPDU to obtain A-MPDU, which is then parsed by the processor to obtain the MPDU; in another example, the receiver
  • the confirmation feedback information of the terminal can be processed by the processor 1210, and then packaged and encoded according to the protocol by the baseband circuit 1230, and further processed by the radio frequency circuit 1240 for analog conversion, filtering, amplification and up-conversion, and then transmitted through the antenna 1250.
  • the memory 1220 may be used to store the program code and data of the sending end, and the memory 1220 may be a storage module. It can be understood that the baseband circuit 1230, the radio frequency circuit 1240, and the antenna 1250 can also be used to support the receiving end to communicate with other network entities.
  • Fig. 12 only shows the simplified design of the receiving end.
  • the receiving end may include any number of transmitters, receivers, processors, memories, etc., and all receiving ends that can implement the present invention are within the protection scope of the present invention.
  • the processors involved in the foregoing apparatus 1100 and apparatus 1200 may be general-purpose processors, such as general-purpose central processing units (CPU), network processors (Network Processor, NP for short), microprocessors, etc., or may be application-specific integrated circuits ( application-specific integrated circBIt, ASIC for short), or one or more integrated circuits used to control the execution of the program of this application.
  • the controller/processor may also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the processor usually executes logic and arithmetic operations based on program instructions stored in the memory.
  • the storage involved in the foregoing apparatus 1100 and apparatus 1200 may also store an operating system and other application programs.
  • the program may include program code, and the program code includes computer operation instructions.
  • the foregoing memory may be a read-only memory (read-only memory, ROM for short), other types of static storage devices that can store static information and instructions, random access memory (RAM for short), and storage Other types of dynamic storage devices for information and instructions, disk storage, etc.
  • the memory can be a combination of the storage types described above.
  • the foregoing computer-readable storage medium/memory may be in the processor, or external to the processor, or distributed on multiple entities including the processor or processing circuit.
  • the foregoing computer-readable storage medium/memory may be embodied in a computer program product.
  • the computer program product may include a computer-readable medium in packaging materials.
  • the embodiments of the present application also provide a chip system.
  • the chip system includes a processor for supporting the sending end or the receiving end to implement the functions involved in any of the above embodiments, for example, generating or processing the functions involved in the above methods. Data and/or information.
  • the chip system may further include a memory, and the memory is used for necessary program instructions and data at the sending end or the receiving end.
  • the chip system can be composed of chips, or include chips and other discrete devices.
  • the embodiment of the present application also provides a processor, which is configured to be coupled with a memory and used to execute the method and function related to the sending end or the receiving end in any of the above embodiments.
  • the processor includes: a processing circuit and a communication interface.
  • the embodiments of the present application also provide a computer program product containing instructions, which when running on a computer, enables the computer to execute the methods and functions related to the sending end or the receiving end in any of the foregoing embodiments.
  • the embodiments of the present application also provide a device for executing the methods and functions related to the receiving end or the transmitting end in any of the foregoing embodiments.
  • An embodiment of the present application also provides a wireless communication system, which includes at least one transmitting end and at least one receiving end involved in any of the foregoing embodiments.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the data transmission device can also be implemented using the following: Field-Programmable Gate Array (FPGA), Programmable Logic Device (PLD), Controller, State machines, gate logic, discrete hardware components, etc., any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.
  • FPGA Field-Programmable Gate Array
  • PLD Programmable Logic Device
  • Controller State machines
  • gate logic discrete hardware components, etc., any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk).

Abstract

本申请公开了一种数据单元的发送方法、接收方法及相关装置，属于通信技术领域。本方案中，发送端发送第一聚合媒体介入控制协议数据单元A-MPDU；确定第一A-MPDU中需要重传的MPDU；需要重传的MPDU包含于第一A-MPDU中的第一A-MPDU子帧中；第一A-MPDU子帧包括第一MPDU分隔符，第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；发送端发送第二A-MPDU，第二A-MPDU包括第二A-MPDU子帧，第二A-MPDU子帧包括需要重传的MPDU和第二MPDU分隔符，第二MPDU分隔符包括第二结束帧EOF字段和第二MPDU长度字段；第二EOF字段的值与第一EOF字段的值相同，第二MPDU长度字段的值与第二MPDU长度字段的值相同。

Description

数据单元的发送方法、接收方法及装置
本申请要求于2019年07月19日提交中国专利局、申请号为201910657446.4、申请名称为“数据单元的发送方法、接收方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，特别涉及一种数据单元的发送方法、接收方法及装置。
背景技术
在通信系统中，由于无线信道的时变特性和多径衰落，会导致信号传输失败。通常采用前向纠错(Forward Error Correction，FEC)编码技术和自动重传请求(Automatic Repeat-reQuest，ARQ)等方法来进行差错控制。比如在无线局域网WLAN(Wireless Local Area Network，WLAN)中，当接入点(Access Point，AP)向站点(Station，STA)发送数据时，若STA成功接收数据，则STA会向AP反馈确认(Acknowledge，ACK)帧；若STA没有成功接收数据，则不会反馈任何帧。若AP没有收到任何反馈，则会对发送的数据进行重传，通过重传进行差错控制。
在ARQ的基础上，LTE(Long Term Evolution，长期演进)等标准中，又引入了混合自动重传请求(Hybrid ARQ，HARQ)技术。接收端预存先前接收到的数据，再接收到重传数据时，对先前接收到的数据和重传时接收到的数据进行合并，从而增加解码的成功率。因为HARQ可以进一步增加重传数据接收的成功率，无线网络中通常在深衰区域或者边缘区域采用HARQ机制，该机制往往可以使得发送端采用更加高的编码调制策略(Modulation and Coding Scheme，MCS)，提升传输效率。
由于HARQ需要一定的缓存来存储需要合并的数据，因此在之前的802.11a/g/n/ac/ax等标准中，都没有引入HARQ机制。在未来的WLAN系统中，例如下一代WLAN，802.11be系统中，由于硬件性能的提升，可以提升传输可靠性和效率的HARQ技术很有可能会被选为下一代WiFi标准的技术之一。因此，如何设计适应于WLAN系统的HARQ机制至关重要。
发明内容
本申请实施例提供了一种数据单元方法及装置，可以适用于WLAN系统，可实现WLAN系统的HARQ传输，提升传输的可靠性和效率。所述技术方案如下：
第一方面，提供一种数据单元的发送方法，应用于发送端，包括：发送第一聚合媒体介入控制协议数据单元A-MPDU；确定第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于第一A-MPDU中的第一A-MPDU子帧中；第一A-MPDU子帧包括第一MPDU分隔符，第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；发送第二A-MPDU，第二A-MPDU包括第二A-MPDU子帧，第二A-MPDU子帧包括需要重传的MPDU和第二MPDU分隔符，第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；第二EOF字段的值与第一EOF字段的值相同，第二MPDU长度字段的值与所述第二MPDU长度字段 的值相同。
第二方面，提供一种数据单元的接收方法，应该于接收端，包括：接收第一聚合媒体介入控制协议数据单元A-MPDU；接收第二A-MPDU，第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述第一A-MPDU中需要重传的MPDU；需要重传的MPDU包含于所述第一A-MPDU的第一A-MPDU子帧中；第一A-MPDU子帧包括第一MPDU分隔符，第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；第二A-MPDU子帧包括第二MPDU分隔符，第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；第二EOF字段的值与所述第一EOF字段的值相同，第二MPDU长度字段的值与第二MPDU长度字段的值相同；对第一A-MPDU子帧对应的编码比特的LLR和第二A-MPDU子帧对应的编码比特的LLR进行合并译码或联合译码，得到所述需要重传的MPDU。
第三方面，提供一种发送装置，包括：发送模块，用于发送第一聚合媒体介入控制协议数据单元A-MPDU；处理模块，用于确定所述第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于所述第一A-MPDU中的第一A-MPDU子帧中，所述第一A-MPDU子帧包括第一MPDU分隔符，所述第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；；所述发送模块，还用于发送第二A-MPDU，所述第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述需要重传的MPDU；所述第二A-MPDU子帧包括第二MPDU分隔符，所述第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；所述第二EOF字段的值与所述第一EOF字段的值相同，所述第二MPDU长度字段的值与所述第二MPDU长度字段的值相同。
第四方面，提供一种接收装置，包括：接收模块，用于接收第一聚合媒体介入控制协议数据单元A-MPDU；所述接收模块，还用于接收第二A-MPDU，所述第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于所述第一A-MPDU的第一A-MPDU子帧中；所述第一A-MPDU子帧包括第一MPDU分隔符，所述第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；所述第二A-MPDU子帧包括第二MPDU分隔符，所述第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；所述第二EOF字段的值与所述第一EOF字段的值相同，所述第二MPDU长度字段的值与所述第二MPDU长度字段的值相同；处理模块，用于对所述第一A-MPDU子帧对应的编码比特的对数似然比LLR和所述第二A-MPDU子帧对应的编码比特的LLR进行合并译码或联合译码，得到所述需要重传的MPDU。
上述任一方面的方法或装置，使得重传MPDU时的信息比特与之前传输MPDU时的信息比特相同，从而使得接收端可以对两次传输的编码比特的LLR进行合并或联合译码，实现了适应于WLAN系统的HARQ机制，从而提升了WLAN系统的传输可靠性。
结合上述任一方面，在一种可能的设计中，所述第一A-MPDU子帧包括第一填充字段，所述第二A-MPDU子帧包括第二填充字段，所述第一填充字段的值与所述第二填充字段的值相同。
结合上述任一方面，在一种可能的设计中，在所述第二A-MPDU中所述需要重传的MPDU的帧头中重试retry比特的值与在所述第一A-MPDU中所述需要重传的MPDU的帧头中的retry比特的值相同。
结合上述任一方面，在所述第二A-MPDU中，所述需要重传的MPDU的帧头中重试retry 比特的值设置为0。
结合上述任一方面，在所述第二A-MPDU中所述需要重传的MPDU的帧头中缓冲业务大小字段的值与在所述第一A-MPDU中所述需要重传的MPDU的帧头中缓冲业务大小字段的值相同。
结合上述任一方面，若所述第一A-MPDU中的MPDU都是所述需要重传的MPDU，所述第二A-MPDU还包括位于所述第二A-MPDU子帧之后的第二结束帧填充字段，所述第一A-MPDU还包括位于所述第一A-MPDU子帧之后的第一结束帧填充字段，其中，所述第二结束帧填充字段的值与所述第一结束帧填充字段的值相同。可选的，所述第一A-MPDU承载于第一物理层协议数据单元PPDU中，所述第二A-MPDU子帧承载于第二PPDU中；所述第一PPDU包括位于所述第一A-MPDU之后的第一Pre-FEC padding，所述第二PPDU包括位于所述第二A-MPDU之后的第二Pre-FEC padding：其中，所述第一Pre-FEC padding和所述第二Pre-FEC padding相同。
第五方面，提供了一种发送装置，用于发送端，包括：存储器和处理器，所述存储器和所述处理器耦合，存储器用于存储计算机程序，计算机程序包括程序指令；处理器用于调用所述程序指令，实现如第一方面所述的方法。
第六方面，提供了一种接收装置，用于接收端，包括：存储器和处理器，所述存储器和所述处理器耦合，所述存储器用于存储计算机程序，所述计算机程序包括程序指令；所述处理器用于调用所述程序指令，实现如第二方面任一所述的数据传输方法。
第七方面，提供了一种计算机可读存储介质，该计算机可读存储介质存储有计算机程序，该计算机程序包含至少一段代码，该至少一段代码可由计算机执行，以控制所述计算机执行如第一方面或第二方面任一方面的方法。
第八面，提供了一种计算机程序，当所述计算机程序被计算机执行时，用于执行如第一方面或第二方面的方法。
可选地，所述计算机程序可以全部或者部分存储在与处理器封装在一起的存储介质上，也可以部分或者全部存储在不与处理器封装在一起的存储器上。
第九方面，提供了一种芯片，包括处理器，用于从存储器中调用并运行所述存储器中存储的指令，使得安装有所述芯片的通信设备执行第一方面或第二方面的方法。
第十方面，提供一种芯片，包括：输入接口、输出接口、处理电路，可选的，还包括存储器，所述输入接口、输出接口、所述处理电路以及所述存储器之间通过内部连接通路相连，所述处理器用于执行所述存储器中的代码，当所述代码被执行时，所述处理电路用于执行如第一方面或第二方面的方法。
第十一方面，提供一种装置，用于实现上述任一方面的方法。
本申请的技术方案，实现了适用于WLAN系统中A-MPDU结构的HARQ机制，提升了WLAN系统的传输可靠性和效率。
附图说明
图1是本申请实施例提供的一种应用场景的示意图；
图2是本申请实施例提供的一种A-MPDU的帧结构示意图；
图3是本申请实施例提供的一种MPDU分隔符的结构示意图；
图4是本申请实施例提供的一种结束帧填充字段的流程示意图；
图5是本申请实施例提供的一种重传MPDU的交互方法的流程示意图；
图6a是本申请实施例提供的一种第一A-MPDU的结构示意图；
图6b是本申请实施例提供的一种第二A-MPDU的结构示意图；
图7a是本申请实施例提供的另一种第一A-MPDU的结构示意图；
图7b是本申请实施例提供的另一种第二A-MPDU的结构示意图；
图8a是本申请实施例提供的一种第一PPDU的结构示意图；
图8b是本申请实施例提供的一种第二PPDU的结构示意图；
图9是本申请实施例提供的一种发送装置的结构示意图；
图10是本申请实施例提供的一种接收装置的结构示意图；
图11是本申请实施例提供的另一种发送装置的结构示意图；
图12是本申请实施例提供的另一种接收装置的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
在无线通信系统中，由于无线信道的时变特性和多径衰落，会导致信号传输失败，因此通常采用前向纠错(FEC，Forward Error Correction)编码技术和自动重传请求(ARQ，Automatic Repeat-reQuest)等方法来进行差错控制。
重传技术指的是发送端重新发送先前未被接收端成功接收或正确接收的数据。重传技术可包括ARQ和HARQ。相比于ARQ，HARQ可以进一步增加重传数据接收的成功率。在LTE中的HAQR技术大体上包括两种实现方式：追逐结合(Chase Combining，CC)和增量冗余(Incremental Redundancy IR)两种类型。
追逐结合，又称做软合并。在CC类型的重传过程中，发送端会重新传输与之前错误传输的先传编码比特相同的编码比特，该重传的编码比特包括信息比特以及校验比特。接收端将重传编码比特与之前接收到的先传编码比特进行合并。这里将上次错误传输的编码比特的LLR(Log-Likelihood ratio，对数似然比)同当前收到的编码比特的LLR进行合并，然后再将合并的LLR值进行解码。
在增量冗余的重传过程中，发送方会重新传输重传编码比特，该重传编码比特区别于先前传输的先传编码比特，比如发送方重传额外的校验比特或重传新生成的校验比特，或者发送方重传信息比特及校验比特的一部分，或者重传编码码字的另一部分，其中重传编码比特可能会存在不同的冗余版本(Redundant Version)。接收端将原始信息同额外接收到的重传编码比特的信息进行联合解码。由于HAQR IR重传的比特数较少，因此HARQ IR相比HARQ CC效率更高，但是需要重新对编码码本进行重新设计，复杂度更高。
在无线通信系统中，例如支持LTE或5G的蜂窝通信系统中，发送端发送单个数据包，该单个数据包仅包括一个数据子包，不聚合多个数据子包。若数据包发送错误、接收错误或未成功接收，则发送端先对待重发的数据包进行编码，然后对编码比特进行扰码，扰码后再进行星座点映射调制、上载频等，最后通过发射天线发送给接收端。接收端接收到信号后，相对应地，依次进行星座点解映射，解扰，将解扰后的每个编码比特的LLR与上次接收到的每个编码比特LLR进行合并译码或者联合译码，译码出数据包的信息比特。
在WLAN通信系统中，由于HARQ需要一定的缓存来存储需要合并的数据，因此在之 前的802.11a/g/n/ac/ax等标准中，都没有引入HARQ机制。在未来的WLAN系统中，例如下一代WLAN，802.11be系统中，由于硬件性能的提升，可以提升传输可靠性和效率的HARQ技术很有可能会被选为下一代WiFi标准的技术之一。因此，本申请实施例将HARQ机制引入WLAN系统中，并进行适应性地设计，提升了WLAN系统的传输可靠性和效率。
本申请实施例的方案适用多种无线局域网系统，例如，电气和电子工程师协会(Institute of Electrical and Electronics Engineers，IEEE)11系列协议，例如，IEEE802.11ax协议的下一代协议(802.11be协议)，或，更下一代的协议。
本申请实施例的方案可以应用于上述通信系统中的发送端和接收端之间的通信。其中，发送端和接收端可以是支持无线通信的无线通信装置或芯片，例如可以是支持WLAN通信系统中的接入点和站点，或接入点和站点中的芯片等。例如，终端和站点也可以称作用户终端、用户装置，接入装置，订户站，订户单元，移动站，用户代理，用户装备或其他名称，其中，用户终端可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备,以及各种形式的用户设备(User Equipment,简称UE),移动台(Mobile station,简称MS)，终端(terminal)，终端设备(Terminal Equipment)，便携式通信设备，手持机，便携式计算设备，娱乐设备，游戏设备或系统，全球定位系统设备或被配置为经由无线介质进行网络通信的任何其他合适的设备等等。基站或接入点又可以包括各种形式的宏基站，微基站，中继站，无线接入点等。
WLAN系统可以包括多个基本服务集(Basic Service Set，BSS)，图1示出的一个基本服务集中包括接入点类的站点(access point，AP)和非接入点类的站点(None access point station，Non-AP STA)，其中，接入点类的站点通常简称为接入点，即AP，非接入点类的站点通常简称为站点，即STA。每个基本服务集可以包含一个AP和关联于该AP的多个STA。接入点为具有无线收发功能的装置，可以为站点提供服务。站点为具有无线收发功能的装置，可以基于接入点接入无线局域网。因此，在该应用场景中，发送端可以是接入点或是站点，接收端也可以是接入点或站点。也就是说，本申请实施例的方法，既可以用于接入点与接入点之间的通信，接入点与站点之间的通信，还可以应用于站点与站点之间的通信。
在WLAN中，AP和STA之间通过媒体介入控制(medium access control,MAC)协议数据单元(MAC Protocol Data Unit，MPDU)来传递数据、控制信令或管理信令等。MPDU通常包括帧头、帧体(Frame Body)和帧校验序列(Frame Check Sequence，FCS)。其中，帧体用于承载上层传递下来的数据、管理信息或控制信息。对于一些特定类型的MPDU，其帧体可能不存在，如确认帧。FCS用于校验该MPDU是否传输正确。可选的，帧头(又称作MAC头，MAC header)可以包括帧控制(Frame Control)字段、时长或标识(Duration/ID)字段、地址信息字段、序列控制(Sequence Control)字段、服务质量控制(Quality of Service Control，QoS Control)字段和高吞吐率控制(High Throughput Control，HT Control)字段中的至少一个字段。一个示例中，其中各个字段的解释可参考IEEE802.11协议，在802.11be协议中，MAC头还可能会增加其他字段或对于现有的MAC头中的某些字段赋予新的含义。
为了提高WLAN性能，目前在MAC层采用帧聚合技术将多个MPDU聚合成一个聚合MPDU(Aggregated MPDU，A-MPDU)。A-MPDU将多个MPDU聚合到一起，通过一个统一的物理层前导进行发送，有效的降低了竞争信道以及物理层前导带来的开销，提升了传输效率。图2是IEEE802.11标准中A-MPDU的结构示意图，如图2所示，A-MPDU包括n个A-MPDU子帧，n为大于等于1的整数。可选地，参见图2，A-MPDU还可以包括位于n个 A-MPDU子帧之后的结束帧(end of frame，EOF)填充(pad)字段。其中，每个A-MPDU子帧包括MPDU分隔符(delimiter)和MPDU。可选地，A-MPDU子帧还可以包括填充字段。其中，MPDU分隔符用于对多个聚合的MPDU进行分隔。结束帧字段之间的n个A-MPDU子帧称为A-MPDU pre-EOF padding。
可选的，MPDU分隔符包括EOF字段、保留位(reserved)字段、MPDU长度(MPDU length)字段、循环冗余码(Cyclic Redundancy Code，CRC)字段和分隔符签名(delimiter signature)字段中的至少一个字段。本申请实施例对MPDU分隔符所包含的内容以及各个字段的排列顺序均不做限定。图3示出了一种MPDU分隔符的结构示意图。
在802.11ax协议中，具体来讲，EOF设置成1，MPDU长度设置成为0的A-MPDU子帧用来指示A-MPDU pre-EOF padding之后进行填充，被称为EOF填充子帧，EOF填充子帧包含于结束帧填充字段，可选的，结束帧填充字段包括EOF填充子帧和EOF填充字节中的至少一项。图4示出了一种结束帧填充字段的结构示意图。如图4所示，其中n为非负整数。对于EOF设置成1，MPDU长度设置成不为0的A-MPDU子帧包括两种情况，其中，一种情况是A-MPDU子帧包含于多业务类型A-MPDU(Multi-TID A-MPDU)或单业务类型A-MPDU(single-TID A-MPDU)中，其中管理帧可以看做成一种特殊携带特殊业务类型的数据帧，比如业务类型15，该A-MPDU子帧在Multi-TID A-MPDU或single-TID A-MPDU中是该所述业务类型中唯一一个A-MPDU子帧，用来请求(solicit)接收端响应单确认信息，可以包含于ACK帧，也可以包含于多站点块确认Multi-STA Block Ack的确认信息中；另一种情况是EOF设置成1，MPDU长度设置成不为0的A-MPDU子帧包括于S-MPDU(或者称为VHT single A-MPDU)中，属于一种特殊的单个MPDU，用来请求(solicit)接收端响应单确认信息。
图5示出了本申请实施例提供一种数据单元(medium access control protocol data unit,MPDU)的交互方法的流程示意图，交互的流程包括：
S101：发送端发送第一聚合媒体介入控制协议数据单元A-MPDU；
第一A-MPDU包括至少一个A-MPDU子帧。
一个A-MPDU子帧包括一个MPDU，因此至少一个A-MPDU子帧中的每一个都包括一个MPDU。例如，至少一个A-MPDU子帧的个数为M，M为正整数，其中，一个A-MPDU子帧包括一个MPDU，因此，M个A-MPDU子帧包括M个MPDU。其中，一个A-MPDU子帧还包括：MPDU分隔符和填充字段。可选的，MPDU分隔符的结构可参考图3。第一A-MPDU在至少一个A-MPDU子帧之后还可以包括结束帧填充字段，可选的，结束帧填充的结构可参考图4。
进一步的，发送端可以将第一A-MPDU封装于第一物理层协议数据单元PPDU(phy protocol data unit,PPDU)中发送给接收端，封装时，在第一A-MPDU后可能会根据需要进行物理层比特填充，例如，pre-FEC padding和/或尾比特(tail bits)。封装过程中，对第一A-MPDU进行编码采用的编码方法和编码参数，本申请实施不限定。例如，可采用低密度校验码(low density parity code，LDPC)和二进制卷积码(Binary convolutional code，BCC)进行编码。在步骤S101中采用的编码参数可以称为先传编码参数。
S102：确定第一A-MPDU中需要重传的MPDU；需要重传的MPDU包含于第一A-MPDU中的第一A-MPDU子帧中；第一A-MPDU子帧包括第一MPDU分隔符，第一MPDU分隔 符包括第一EOF字段和第一MPDU长度字段。
发送端确定第一A-MPDU中需要被重传的MPDU，需要被重传的MPDU包含于第一A-MPDU的第一A-MPDU子帧中。需要被重传的MPDU可以为一个或多个。可以理解的，需要被重传的MPDU包括N个，则N个需要被重传的MPDU分别包含于第一A-MPDU中的N个第一A-MPDU子帧中。可选的，第一A-MPDU还可以包括其他A-MPDU子帧，可选的，其他A-MPDU子帧中的MPDU不需要重传。
发送端可以基于多种方式确定先前传输的A-MPDU中的哪些MPDU需要重传。例如可以基于接收端发送的确认信息，或者，可以结合自身的业务需求，或者，还可以根据接收端发送的确认信息以及自身的实际情况，确定先前传输的哪些MPDU需要被重传。
一种方式：发送端基于接收端反馈的确认信息确定哪些MPDU需要重传。因此，可选的，接收端反馈的确认信息，用于向所述发送端指示先前传输的A-MPDU中哪些MPDU为接收成功。例如，接收端可以通过否定确认(NACK)信息，或者，块确认(Block Ack)帧中的比特位图,或者，多用户块确认(Multi-STA Block Ack)帧中的比特位图告知发送端哪些MPDU没有接收成功或接收失败。
可选的，需要被重传的MPDU可以是先前传输中未被接收端成功接收(接收失败)的MPDU，不需要重传的MPDU可以是先前传输中被接收端成功接收(接收成功)的MPDU或者不再需要重新传输的未被正确接收的MPDU，例如，MPDU的实效时间结束了。
可选的，在步骤S102之前包括，S102a，接收端发送对第一A-MPDU反馈的确认信息，所述确认信息用于指示所述第一A-MPDU中的至少一个MPDU是否发送成功。可选的，确认信息可以为确认(acknowledge，ACK)或块确认(block acknowledge,BA)。
相对应地，接收端接收确认信息。根据确认信息，发送端确定第一A-MPDU中哪些MPDU发送失败，从而确定需要重传的MPDU。例如，第一A-MPDU的M个MPDU中有N个MPDU发送失败，其中N为大于等于1，小于等于M的整数，则发送端确定需要重传的MPDU为N个。
在步骤S102中，发送端确定需要重传的MPDU后，在第二A-MPDU中对这些MPDU进行重传。
S103：发送端发送第二A-MPDU，第二A-MPDU包括第二A-MPDU子帧，第二A-MPDU子帧包括需要重传的MPDU和第二MPDU分隔符，第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；
第二EOF字段的值与第一EOF字段的值相同，第二MPDU长度字段的值与第二MPDU长度字段的值相同。
第一A-MPDU中需要被重传的MPDU可以为一个或多个。对于需要被重传的MPDU为多个，例如N个，则N个MPDU分别包含于第二A-MPDU的N个第二A-MPDU子帧中。一个第二A-MPDU包括一个需要被重传的MPDU。可选的，第二A-MPDU中还可以包括其他A-MPDU子帧。第二A-MPDU中的每一个子帧还可以包括MPDU分隔符和填充字段，可选的，MPDU分隔符的结构可参考图3，填充字段的结构可参考图4。
可选的，第二MPDU分隔符与第一MPDU分隔符相同，即第二MPDU分隔符中任一字段的取值都于第一MPDU分隔符中对应字段的取值相同。
可选的，在第二A-MPDU中，该重传的MPDU包括MAC头，该MAC头中各个字段的值也应该设置得与第一A-MPDU中该MPDU的MAC头中各个字段的值相同。
可选的，如果MPDU进行加密，则该MPDU还可以包括加密头字段，重传该MPDU时的加密头字段的值也需与先前传输该MPDU时的加密头字段的值相同，该加密头字段位于MAC头字段之后。加密的方法包括多种，例如，采用密码块链接消息认证码(cipher-block chaining message authentication code，CBC-MAC)协议(CBC-MAC protocol，CCMP)进行加密，则该加密头为CCMP头(CCMP Header)，该MPDU可以称为CCMP MPDU，CCMP MPDU还包括消息完整性码(message integrity codes，MIC)字段，CCMP头为8个字节，MIC字段为16个字节。CCMP头字段包括包号(packet number，PN)，存在初始化向量(extensing initialization vectors,ExtIV)指示和密钥ID(Key ID)子字段构成。又例如，采用伽罗瓦/计数器模式(Galois/counter mode，GCM)协议(GCM protocol，GCMP)进行加密，则加密头为GCMP头(GCMP Header)，该MPDU可以称为GCMP MPDU，GCMP MPDU还包括MIC字段，GCMP头为8字节，MIC为16字节。GCMP头包括PN，存在初始化向量(extensing initialization vectors,ExtIV)指示和Key ID子字段，在GCMP头中，ExtIV指示始终置为1。
可选的，第一A-MPDU子帧包括第一填充字段，第二A-MPDU子帧包括第二填充字段，第一填充字段的值与第二填充字段的值相同。可选的，在第二A-MPDU中需要重传的MPDU的帧头中重试retry比特的值与在第一A-MPDU中需要重传的MPDU的MAC头中的retry比特的值相同。可选的，在第二A-MPDU中，需要重传的MPDU的MAC头中重试retry比特的值设置为0，可选的，在第二A-MPDU中需要重传的MPDU的MAC头中缓冲业务大小字段的值与在第一A-MPDU中所述需要重传的MPDU的MAC头中缓冲业务大小字段的值相同。可选的，retry比特包含于MAC头的帧控制字段中，缓冲业务大小字段可以包含于MAC头中的HT-Control字段(在802.11ax中，称为A-control字段)或QoS控制字段。
进一步的，发送端可以将第二A-MPDU封装于第二物理层协议数据单元PPDU中，发送给接收端，在步骤S103中对第二A-MPDU进行编码的参数称为重传编码参数。为了便于接收端进行合并或联合译码，对第二A-MPDU编码所采用的编码方法和编码参数与第一A-MPDU编码时所采用的编码方法和编码参数相同或存在预设关系。
可选的，编码参数(重传编码参数和先传编码参数)包括：码率，以及，码率对应的生成多项矩阵；可选的还包括打孔模式。一个示例中，重传编码参数与先传编码参数相同可以指的是：码率，以及，码率对应的生成多项矩阵相同，可选的，若编码参数包括打孔模式，则重传和先传的打孔模式也相同。一个示例中，重传编码参数与先传编码参数存在预设关系指的是：码率，以及，码率对应的生成多项矩阵相同，若编码参数包括打孔模式，则重传和先传的打孔模式存在预设关系，重传打孔模式得到的编码比特与先传打孔模式得到的编码比特可以合并成新的打孔模式后得到的编码比特。
下面以BCC编码和LDPC编码为例来说明。
可选的，重传时，对所述第二A-MPDU子帧进行LDPC编码包括但不限于以下两种方式：
1)对HARQ CC，对待重传的MPDU或者连续待重传的MPDU对应的LDPC码字中已被正确接收的信息比特进行打孔，即删去。值得说明的是，本申请不限制如何获得对带重传的MPDU或者连续待重传的MPDU对应的LDPC码字，该LDPC码字可以是之前存储的，也可以是根据待重传MPDU的采用的同样的参数进行LDPC编码重新生成。
2)对于HARQ IR，对待重传的MPDU或者连续待重传的MPDU对应的LDPC码字包含的信息比特产生新的校验比特，与对应的信息比特组合成新的LDPC码字。通常来讲，新 的LDPC码字包含的信息比特集合(含比特数以及对应的比特)与上次错误传输的LDPC码字包含的信息比特集合是一样的，也可以说初传和重传的LDPC码字是用同一个母LDPC码本生成的，即初传和重传的LDPC码字包含的信息比特位一样，校验比特是母LDPC码字的校验位的不同子集(不同子集可以交叠)。
需要说明的是，不论是采用BCC编码还是LDPC编码，第二A-MPDU子帧所包括的比特是作为信息比特进行编码的，当然在编码中，可以进行打孔，可以打孔信息比特，也可以打孔校验比特。
可选的，重传时，对第二A-MPDU子帧进行BCC编码包括但不限于以下两种方式：
1)对HARQ CC，对单个待重传的MPDU或者至少两个连续待重传的MPDU对应的第二A-MPDU子帧采用重传编码参数(包括码率，及码率对应的生成多项矩阵，以及可选的打孔模式)，进行BCC编码。重传编码参数与先传编码参数相同或存在预设关系。可选的，重传和先前传输所采用的码率，码率对应的生成多项矩阵相同，可选的，还包括，所采用的打孔模式相同。
BCC编码参数(例如重传编码参数和先传编码参数)包括码率，和生成多项矩阵，可选的，还包括打孔模式。通常来讲，对用应用产品的标准协议来讲，一种码率对应一种生成多项矩阵，BCC编码参数还可选的包括打孔模式。而在学术讨论中，每个码率可以对应不同的生成多项矩阵和打孔模式。
2)对于HARQ IR，对单个待重传的MPDU或者至少两个连续待重传的MPDU对应的第二A-MPDU子帧进行同样参数的BCC编码，包括码率，及其对应的生成矩阵。然后把编码后的比特按照与先前传输的打孔模式不同的另一种打孔模式对编码比特进行周期性的打孔，生成打孔的编码比特。重传采用的打孔模式与先前传输采用的打孔模式不同，存在预设关系，重传的打孔模式和先前传输的打孔模式生成的编码比特可以合起来看成另一个新的打孔模式或者没有打孔操作而生成的编码比特。因此，重传编码参数与先传编码参数存在预设关系指的是：重传和先前传输所采用的码率，码率对应的生成多项矩阵相同，重传采用的打孔模式与先前传输采用的打孔模式存在预设关系。
为支持HARQ机制，本申请实施例提出重传的MPDU需要与之前传输的MPDU内容相同，同时该重传的MPDU所在的A-MPDU子帧包括的MPDU分隔符和填充字段也需与之前传输的MPDU分隔符字段和填充字段的值相同，其中MPDU分割符字段包括的EOF和MPDU长度子字段的值保持一致。
S104：对所述第一A-MPDU子帧对应的编码比特的对数似然比LLR和所述第二A-MPDU子帧对应的编码比特的LLR进行合并译码或联合译码，得到需要重传的MPDU。
接收端对第二A-MPDU中第二A-MPDU子帧所对应的编码比特的LLR，和，第一A-MPDU中的第一A-MPDU子帧的编码比特的LLR，进行合并译码或联合译码，得到A-MPDU子帧的信息比特，从而获得需要被重传的MPDU，从而使得先前错误传输的MPDU被成功接收，提高传输可靠性。
一种实现方式中，采用LDPC编码，对于HARQ CC，接收端会对第二A-MPDU子帧对应的LDPC码字的LLR与第一A-MPDU子帧对应的LDPC码字的LLR进行合并译码。对于HARQ IR，接收端会对第二A-MPDU子帧对应的LDPC码字与第一A-MPDU子帧对应的LDPC码字的LLR进行联合译码。
另一种方式，采用BCC编码，对于HARQ CC，接收端会对第二A-MPDU子帧对应的 BCC编码比特的LLR与第一A-MPDU子帧对应的BCC编码比特的LLR进行合并译码。对于HARQ IR，接收端会对第二A-MPDU子帧对应的BCC编码比特的LLR与第一A-MPDU子帧对应的BCC编码比特的LLR进行联合译码。
一种情况中，若第一A-MPDU中包括的至少一个MPDU都是需要重传的MPDU，也就是说发送端需要重传整个第一A-MPDU中的MPDU，且第二A-MPDU还包括位于所有的第二A-MPDU子帧之后的第二结束帧填充字段，第一A-MPDU还包括位于第一A-MPDU子帧之后的第一结束帧填充字段，则第二结束帧填充字段的值与第一结束帧填充字段的值相同。在发送端需要重传整个第一A-MPDU中的MPDU的情况下，可选的，在第二A-MPDU后面填充的物理层填充比特也需与上次第一A-MPDU之后填充的物理层填充比特的值一致，例如，承载第一A-MPDU子帧的第一PPDU可能还包括位于第一A-MPDU之后的第一Pre-FEC padding，承载第二A-MPDU子帧的第二PPDU可能包括位于第二A-MPDU之后的第二Pre-FEC padding，其中，第一Pre-FEC padding和第二Pre-FEC padding相同。例如，第一PPDU可能还包括位于第一A-MPDU之后的第一尾比特，第二PPDU可能还包括位于第二A-MPDU之后的第二尾比特，其中，第二尾比特的值与第一尾比特的值也相同。
本申请实施例中，发送端在重传时，将包含重传MPDU所属的A-MPDU子帧中的相关字段的取值与先前传输该MPDU所属的A-MPDU子帧中的相关字段的取值设置得相同，使得信息比特相同，接收端才能对先前传输的A-MPDU子帧的编码比特的LLR与此时重传的A-MPDU子帧的编码比特LLR进行合并或联合译码，从而提升传输可靠性和效率。否则由于信息比特不同，前后传输的包含同一个MPDU的A-MPDU子帧的编码比特的LLR无法进行合并或联合译码。本申请实施例的方案，实现了适用于WLAN系统中的A-MPDU的结构的HARQ机制。
图6a示出的第一A-MPDU的结构示意图，图6b示出了一种第二A-MPDU的结构示意图。
结合图6a和图6b举例，发送端在信道上发送单业务类型S-MPDU(第一A-MPDU，如图6a所示)，包括A-MPDU子帧1，但是A-MPDU子帧1中的MPDU传输失败了，重传时与其他同样业务类型的的MPDU聚合在一起(第二A-MPDU，如图6b)发送。值得注意的是，若采用现有的802.11ax协议对第二A-MPDU子帧中的A-MPDU子帧1的EOF设置，则该EOF应该设置为0。为支持HARQ机制，在该示例中，第二A-MPDU中的A-MPDU子帧1的MPDU分隔符的EOF设置不遵循802.11ax及之前协议的设置，而是将第二A-MPDU的A-MPDU子帧1中的EOF的值设置为与第一A-MPDU中的A-MPDU子帧1的EOF的值相同。另外，第二A-MPDU中A-MPDU子帧1的MPDU分隔符中的MPDU长度字段的值也需与第一A-MPDU中的A-MPDU子帧1的MPDU分隔符中的MPDU长度字段的值相同。原因如下：重传的A-MPDU子帧包括的MPDU内容可能是之前失败的MPDU的一部分，比如在HARC CC传输中，每次重传时传的是预设计好的不同冗余版本；重传时A-MPDU子帧1中填充字段也需与上次错误传输的A-MPDU子帧1内填充字段的值一样。
图7a为另一种第一A-MPDU的结构示意图，图7b为另一种第二A-MPDU的结构示意图。
结合图7a和图7b举例，发送端在信道上发送多业务类型聚合媒体介入控制数据单元 Multi-TID A-MPDU(multiple traffic ID A-MPDU,muti-TID A-MPDU)，业务类型包含TID1和TID2，如下图7a所示为Multi-TID A-MPDU(第一A-MPDU)。基于接收端反馈的确认信息获知第一A-MPDU中A-MPDU子帧1失败了，下次重传时与其他业务类型为TID1的MPDU聚合在一起发送，如图7b所示为第二A-MPDU。值得注意的是，在第二A-MPDU中A-MPDU子帧1的MPDU分隔符的EOF设置不满足802.11ax及之前协议的设置，但是为了支持HARQ传输，第二A-MPDU中A-MPDU子帧1的EOF设置与第一A-MPDU中A-MPDU子帧1的EOF的值一样。另外，第二A-MPDU中A-MPDU子帧1的MPDU分隔符中的MPDU长度字段的值也需与第一A-MPDU中的A-MPDU子帧1的MPDU分隔符中的MPDU长度字段的值相同。原因如下：重传的A-MPDU子帧包括的MPDU内容可能是之前失败的MPDU的一部分，比如在HARC CC传输中，每次重传时传的是预设计好的不同冗余版本。重传时A-MPDU子帧1内填充字段也需与上次传错误传输的A-MPDU子帧1内填充字段的值一样。
图6a，图6b和图7a，图7b仅示出了重传一个MPDU的情况，当然本申请实施例的方案同样还可以适用于重传多个MPDU的情况，不限于图6a，图6b和图7a，图7b的示例。
其中图8a为一种第一PPDU的示意图，图8b为一种第二PPDU的示意图。
如果重传整个第一A-MPDU，第二A-MPDU包括第一A-MPDU中的所有MPDU。第二A-MPDU的结束帧填充字段的值也需与第一A-MPDU的结束帧填充字段的值一致，可选的，第二A-MPDU后可能还包括的物理层填充比特也需与第一A-MPDU后包括的物理层填充比特的值一致。在802.11ax或之前的协议中，未对物理层填充比特的值进行规定为避免在HARQ传输中可能会导致的无法合并或联合译码的问题，因此本申请中，第二A-MPDU后可能包括的物理层填充比特也需与第一A-MPDU后包括的物理层填充比特的值一致。
在802.11ax协议，为了接收机有更多的处理时间，第一PPDU中在A-MPDU后还可以包括Pre-FEC padding和/或包扩展(packet extension)，其中，Pre-FEC padding的时长可以为四分之一(1/4)OFDM符号时长，二分之一(1/2)OFDM符号时长或者四分之三(3/4)OFDM符号时长，包扩展的时长可以为4μs,8μs或16μs。可选的，在重传时，第二PPDU中包括的Pre-FEC padding字段值也需与第一PPDU中的Pre-FEC padding的值设置成一致。
当然图8a和8b示出的这种重传整个A-MPDU的场景中，每一个被重传的MPDU所属的A-MPDU子帧的EOF的值，MPDU长度字段的值也需要设置成与先前相同，具体的设置可参考前述实施例的描述。
另外，不论是重传第一A-MPDU中的部分MPDU还是重传所有MPDU，对于每一个需要重传的MPDU，若参考802.11ax或之前的协议，则先前传输的MPDU与后续重传的MPDU的MAC头中携带的控制信息可能会被设置得不相同，比如说MAC头中帧控制字段的retry比特值的设置，在先前传输时，retry比特设置成0，重传时retry比特指示成1。又例如，MAC头中HT-control字段(在802.11ax称为A-control)或QoS控制字段携带的缓冲业务的大小，在先前传输时，通过MAC头中HT-control字段(在802.11ax称之为A-control)或QoS控制字段中指示的缓冲业务的大小可能是X字节，但是到了重传时，MAC头中HT-control字段(在802.11ax称为A-control)或QoS控制字段在指示的缓冲业务的大小可能是Y字节。在本申请中，不论是重传第一A-MPDU中的部分MPDU还是重传所有MPDU，对于每一个需要重传的MPDU，在重传任一个MPDU时，被重传的MPDU的MAC头的内容需保持与上次错误传输的MPDU的MAC头携带的内容相同，包括帧控制字段的retry比特，HT-control字段(在802.11ax称之为A-control)或QoS控制字段携带的缓冲业务的大小字段等。因此， 也就是说，若参考802.11ax或之前的协议，重传该MPDU时，某些字段的值可能会被设置得与先前传输该MPDU时这些字段的值不同，那么在本申请实施例中，都需要将这些字段设置得相同，以确保重传的信息比特的取值与先前传输的信息比特的取值相同，保障接收端可以实现联合译码或合并译码，从而实现HARQ机制。
图9是本申请实施例提供的一种发送装置的结构示意图，该发送装置可以用于发送端或发送端内的芯片，该发送装置900包括处理模块901，发送模块902，和，接收模块903。
在一种实施方式中，该发送装置可以用于执行前述中的发送端的任意功能，例如：
处理模块901，用于确定第一A-MPDU中需要重传的MPDU，例如，用于执行前述S102，或；处理模块901还用于对第一A-MPDU进行编码，或，处理模块901还用于对第二A-MPDU进行编码。发送模块902，用于发送第一A-MPDU，和，第二A-MPDU，例如，用于执行S101和S103。接收模块903，用于接收确认反馈信息，确认反馈信息用于指示第一A-MPDU中哪些MPDU未接收成功，例如用于执行S102a。可选的，发送装置900还包括存储模块904，用于存储指令。
在一个可能的设计中，发送装置900为发送端中的芯片，发送模块为输入接口，接收模块为输出接口，处理模块为处理电路，输入接口和输出接口用于芯片与其他器件之间实现信令或数据的交互，处理电路用于实现对信令或数据的处理，例如，用于发送(输出)第一A-MPDU和第二A-MPDU，用于接收(输入)确认信息，处理电路用于根据确认信息确定第一A-MPDU中的哪些MPDU需要重传。安装该芯片的装置可以实现上述实施例中涉及发送端的方法和功能。
本申请实施例以图9所示的数据传输装置为例，对用于发送端的数据传输装置中的各个模块进行说明。
图10是本申请实施例提供的一种接收装置的结构示意图，该接收装置1000可以用于接收端或接收端内的芯片，该接收装置1000包括处理模块1001，发送模块1002，和，接收模块1003。
在一种实施方式中，该接收装置可以用于执行前述接收端的任意功能，例如：
处理模块1001，用于确定第一A-MPDU中的哪些MPDU是否发送成功；处理模块1001还用于对第一A-MPDU子帧的编码比特的LLR和第二A-MPDU子帧编码比特的LLR进行合并译码或联合译码，得到重传的MPDU。例如，用于执行前述S104。发送模块1002，用于发送确认信息，例如用于执行前述S102a，其中，确认反馈用于指示第一A-MPDU中哪些MPDU未成功接收。接收模块1003，用于接收第一A-MPDU和第二A-MPDU，例如，用于接收S102和S103发送的信息。可选的，还包括存储模块1004，用于存储先传编码比特对应的LLR，可选的，还用于存储指令。
在一个可能的设计中，接收装置1000为接收端中的芯片，发送模块为输入接口，接收模块为输出接口，处理模块为处理电路，输入接口和输出接口用于芯片与其他器件之间实现信令或数据的交互，处理电路用于实现对信令或数据的处理，例如，用于接收(输入)第一A-MPDU和第二A-MPDU，用于发送(输出)确认信息，处理电路用于根据确认信息确定第一A-MPDU中的哪些MPDU发送成功，哪些发送失败。安装该芯片的装置可以实现上述实施例中涉及接收端的方法和功能。
本申请实施例以图10所示的数据传输装置为例，对用于接收端的数据传输装置中的各个 模块进行说明。
本申请实施例提供的发送装置(用于发送端)或接收装置(用于接收端)可以有多种产品形态来实现，例如，发送装置或接收装置可配置成通用处理系统；例如，发送装置或接收装置可以由一般性的总线体系结构来实现；例如，发送装置或接收装置可以由专用集成电路(application specific integrated circuit，ASIC)来实现等等。以下提供本申请实施例中发送装置或接收装置可能的几种产品形态，应当理解的是，以下仅为举例，不限制本申请实施例可能的产品形态仅限于此。
在一个示例中，图11示出了本申请实施例的一种发送装置1100的示意性框图。本申请实施例的装置1100可以是上述任一方法实施例中的发送端，也可以是发射端内的一个或多个芯片。装置1100可以用于执行上述方法实施例中的发送端的部分或全部功能。
该装置1100可以包括：处理器1110，基带电路1130，射频电路1140以及天线1150，可选的，该装置1100还可以包括存储器1120。装置1100的各个组件通过总线1160耦合在一起，其中总线系统1160除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统1160。
处理器1110可用于实现对发送端的控制，用于执行上述实施例中由发送端进行的处理，可以执行上述方法实施例中涉及发送端的处理过程和/或用于本申请所描述的技术的其他过程，还可以运行操作系统，负责管理总线以及可以执行存储在存储器中的程序或指令。
基带电路1130、射频电路1140以及天线1150可以用于支持发送端和上述实施例中涉及的接收端之间收发信息，以支持发送端与接收端之间进行无线通信。
一个示例中，在发送端，第一A-MPDU或第二A-MPDU，由处理器1110进行处理，经由基带电路1130进行按协议封装成A-MPDU后，再进行加扰，编码等基带处理，进一步由射频电路1140进行模拟转换、滤波、放大和上变频等射频处理后，经由天线1150发射出去。又一个示例中，来自接收端发送的确认反馈信息经由天线1150接收，由射频电路1140进行滤波、放大、下变频以及数字化等处理后，再经由基带电路1130解码、按协议解封装数据等基带处理后，由处理器1110进行处理来恢复接收端所发送的确定反馈信息；
存储器1120可以用于存储发送端的程序代码和数据，存储器1120可以是图11中的存储模块1130。可以理解的，基带电路1130、射频电路1140以及天线1150还可以用于支持发送端与其他网络实体进行通信，例如,用于支持发送端与核心网侧的网元进行通信。图11中存储器1120被示为与处理器1110分离，然而，本领域技术人员很容易明白，存储器1120或其任意部分可位于信道资源分配装置1100之外。举例来说，存储器1120可以包括传输线、和/或与无线节点分离开的计算机制品，这些介质均可以由处理器1110通过总线接口1160来访问。可替换地，存储器1120或其任意部分可以集成到处理器1110中，例如，可以是高速缓存和/或通用寄存器。
可以理解的是，图11仅仅示出了发送端的简化设计。例如，在实际应用中，发送端可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本发明的发送端都在本发明的保护范围之内。
本申请实施例详细描述接收装置的示意性结构。在一个示例中，图12示出了本申请实施例的接收装置1200的示意性框图。本申请实施例的装置1200可以是上述任一方法实施例中的接收端，也可以是接收端内的一个或多个芯片。装置1200可以用于执行上述方法实施例中的接收端的部分或全部功能。
该装置1200可以包括：处理器1210，基带电路1230，射频电路1240以及天线1250，可选的，该装置1200还可以包括存储器1220。装置1200的各个组件通过总线1260耦合在一起，其中总线系统1260除包括数据总线之外，还包括电源总线、控制总线和状态信号总线。但是为了清楚说明起见，在图中将各种总线都标为总线系统1260。
处理器1210可用于实现对接收端的控制，用于执行上述实施例中由接收端进行的处理，可以执行上述方法实施例中涉及发送端的处理过程和/或用于本申请所描述的技术的其他过程，还可以运行操作系统，负责管理总线以及可以执行存储在存储器中的程序或指令。
基带电路1230、射频电路1240以及天线1250可以用于支持接收端和上述实施例中涉及的发送端之间收发信息，以支持接收端与发送端之间进行无线通信。一个示例中，来自发送端发送的信号经由天线1250接收，由射频电路进行滤波、放大、下变频以及数字化等处理后，再经由基带电路解码、按协议解封装数据等基带处理后，由处理器1210进行处理来恢复发送端所发送的业务数据和信令信息，例如，接收端对接收到的PPDU进行解码解封装后得到A-MPDU，再经由处理器解析得到MPDU；又一个示例中，接收端的确认反馈信息可由处理器1210进行处理，经由基带电路1230进行按协议封装，编码等基带处理，进一步由射频电路1240进行模拟转换、滤波、放大和上变频等射频处理后，经由天线1250发射出去，存储器1220可以用于存储发送端的程序代码和数据，存储器1220可以是存储模块。可以理解的，基带电路1230、射频电路1240以及天线1250还可以用于支持接收端与其他网络实体进行通信。
可以理解的是，图12仅仅示出了接收端的简化设计。例如，在实际应用中，接收端可以包含任意数量的发射器，接收器，处理器，存储器等，而所有可以实现本发明的接收端都在本发明的保护范围之内。上述装置1100和装置1200中涉及的处理器可以是通用处理器，例如通用中央处理器(CPU)、网络处理器(Network Processor，简称NP)、微处理器等，也可以是特定应用集成电路(application-specific integrated circBIt，简称ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。还可以是数字信号处理器(Digital Signal Processor，简称DSP)、现场可编程门阵列(Field-Programmable Gate Array，简称FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。控制器/处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。处理器通常是基于存储器内存储的程序指令来执行逻辑和算术运算。
上述装置1100和装置1200中涉及的存储器还可以保存有操作系统和其他应用程序。具体地，程序可以包括程序代码，程序代码包括计算机操作指令。更具体的，上述存储器可以是只读存储器(read-only memory，简称ROM)、可存储静态信息和指令的其他类型的静态存储设备、随机存取存储器(random access memory，简称RAM)、可存储信息和指令的其他类型的动态存储设备、磁盘存储器等等。存储器可以是上述存储类型的组合。并且上述计算机可读存储介质/存储器可以在处理器中，还可以在处理器的外部，或在包括处理器或处理电路的多个实体上分布。上述计算机可读存储介质/存储器可以具体体现在计算机程序产品中。举例而言，计算机程序产品可以包括封装材料中的计算机可读介质。
本申请实施例还提供了一种芯片系统，该芯片系统包括处理器，用于支持发送端或接收端以实现上述任一实施例中所涉及的功能，例如生成或处理上述方法中所涉及的数据和/或信息。在一种可能的设计中，所述芯片系统还可以包括存储器，所述存储器，用于发送端或接收端必要的程序指令和数据。该芯片系统，可以由芯片构成，也可以包含芯片和其他分立器 件。
本申请实施例还提供了一种处理器，用于与存储器耦合，用于执行上述任一实施例中涉及发送端或接收端的方法和功能，可选的，该处理器包括：处理电路和通信接口。本申请实施例还提供了一种包含指令的计算机程序产品，其在计算机上运行时，使得计算机执行执行上述任一实施例中涉及发送端或接收端的方法和功能。本申请实施例还提供了一种装置，用于执行上述任一实施例中涉及接收端或发送端的方法和功能。本申请实施例还提供一种无线通信系统，该系统包括上述任一实施例中涉及的至少一个发送端和至少一个接收端。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。作为又一种可能的产品形态，数据传输装置也可以使用下述来实现：现场可编程门阵列(Field－Programmable Gate Array，FPGA)、可编程逻辑器件(Programmable Logic Device，PLD)、控制器、状态机、门逻辑、分立硬件部件等、任何其它适合的电路、或者能够执行本申请通篇所描述的各种功能的电路的任意组合。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤或数字用户线)或无线(例如红外、无线或微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk)等。

Claims (20)

  1. 一种数据单元的发送方法，应用于发送端，其特征在于，包括：
    发送第一聚合媒体介入控制协议数据单元A-MPDU；
    确定所述第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于所述第一A-MPDU中的第一A-MPDU子帧中；所述第一A-MPDU子帧包括第一MPDU分隔符，所述第一MPDU分隔符包括第一结束帧EOF字段和第一MPDU长度字段；
    发送第二A-MPDU，所述第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述需要重传的MPDU和第二MPDU分隔符，所述第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；
    所述第二EOF字段的值与所述第一EOF字段的值相同，所述第二MPDU长度字段的值与所述第二MPDU长度字段的值相同。
  2. 一种数据单元的接收方法，应该于接收端，其特征在于，包括：
    接收第一聚合媒体介入控制协议数据单元A-MPDU；
    接收第二A-MPDU，所述第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于所述第一A-MPDU的第一A-MPDU子帧中；所述第一A-MPDU子帧包括第一MPDU分隔符，所述第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；所述第二A-MPDU子帧包括第二MPDU分隔符，所述第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；
    所述第二EOF字段的值与所述第一EOF字段的值相同，所述第二MPDU长度字段的值与所述第二MPDU长度字段的值相同；
    对所述第一A-MPDU子帧对应的编码比特的对数似然比LLR和所述第二A-MPDU子帧对应的编码比特的LLR进行合并译码或联合译码，得到所述需要重传的MPDU。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一A-MPDU子帧包括第一填充字段，所述第二A-MPDU子帧包括第二填充字段，所述第一填充字段的值与所述第二填充字段的值相同。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，在所述第二A-MPDU中所述需要重传的MPDU的帧头中重试retry比特的值与在所述第一A-MPDU中所述需要重传的MPDU的帧头中的retry比特的值相同。
  5. 根据权利要求4所述的方法，其特征在于，在所述第二A-MPDU中，所述需要重传的MPDU的帧头中重试retry比特的值设置为0。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，在所述第二A-MPDU中所述需要重传的MPDU的帧头中缓冲业务大小字段的值与在所述第一A-MPDU中所述需要重传的MPDU的帧头中缓冲业务大小字段的值相同。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，若所述第一A-MPDU中的MPDU都是所述需要重传的MPDU，所述第二A-MPDU还包括位于所述第二A-MPDU子帧之后的第二结束帧填充字段，所述第一A-MPDU还包括位于所述第一A-MPDU子帧之后的第一结束帧填充字段，其中，所述第二结束帧填充字段的值与所述第一结束帧填充字段的值相同。
  8. 根据权利要求7中所述的方法，其特征在于，所述第一A-MPDU承载于第一物理层协议数据单元PPDU中，所述第二A-MPDU子帧承载于第二PPDU中；
    所述第一PPDU包括位于所述第一A-MPDU之后的第一Pre-FEC padding，所述第二PPDU包括位于所述第二A-MPDU之后的第二Pre-FEC padding：
    其中，所述第一Pre-FEC padding和所述第二Pre-FEC padding相同。
  9. 一种数据单元的发送装置，包括：
    发送模块，用于发送第一聚合媒体介入控制协议数据单元A-MPDU；
    处理模块，用于确定所述第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于所述第一A-MPDU中的第一A-MPDU子帧中，所述第一A-MPDU子帧包括第一MPDU分隔符，所述第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；
    所述发送模块，还用于发送第二A-MPDU，所述第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述需要重传的MPDU和第二MPDU分隔符，所述第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；
    所述第二EOF字段的值与所述第一EOF字段的值相同，所述第二MPDU长度字段的值与所述第二MPDU长度字段的值相同。
  10. 一种数据单元的接收装置，包括：
    接收模块，用于接收第一聚合媒体介入控制协议数据单元A-MPDU；
    所述接收模块，还用于接收第二A-MPDU，所述第二A-MPDU包括第二A-MPDU子帧，所述第二A-MPDU子帧包括所述第一A-MPDU中需要重传的MPDU；所述需要重传的MPDU包含于所述第一A-MPDU的第一A-MPDU子帧中；所述第一A-MPDU子帧包括第一MPDU分隔符，所述第一MPDU分隔符包括第一EOF字段和第一MPDU长度字段；所述第二A-MPDU子帧包括第二MPDU分隔符，所述第二MPDU分隔符包括第二EOF字段和第二MPDU长度字段；
    所述第二EOF字段的值与所述第一EOF字段的值相同，所述第二MPDU长度字段的值与所述第二MPDU长度字段的值相同；
    处理模块，用于对所述第一A-MPDU子帧对应的编码比特的对数似然比LLR和所述第二A-MPDU子帧对应的编码比特的LLR进行合并译码或联合译码，得到所述需要重传的MPDU。
  11. 根据权利要求9或10所述的装置，其特征在于，所述第一A-MPDU子帧包括第一填充字段，所述第二A-MPDU子帧包括第二填充字段，所述第一填充字段的值与所述第二填 充字段的值相同。
  12. 根据权利要求9至11中任一项所述的装置，其特征在于，在所述第二A-MPDU中所述需要重传的MPDU的帧头中重试retry比特的值与在所述第一A-MPDU中所述需要重传的MPDU的帧头中的retry比特的值相同。
  13. 根据权利要求12所述的装置，其特征在于，在所述第二A-MPDU中，所述需要重传的MPDU的帧头中重试retry比特的值设置为0。
  14. 根据权利要求9至13中任一项所述的装置，其特征在于，在所述第二A-MPDU中所述需要重传的MPDU的帧头中缓冲业务大小字段的值与在所述第一A-MPDU中所述需要重传的MPDU的帧头中缓冲业务大小字段的值相同。
  15. 根据权利要求9至14中任一项所述的装置，其特征在于，若所述第一A-MPDU中的MPDU都是所述需要重传的MPDU，所述第二A-MPDU还包括位于所述第二A-MPDU子帧之后的第二结束帧填充字段，所述第一A-MPDU还包括位于所述第一A-MPDU子帧之后的第一结束帧填充字段，其中，所述第二结束帧填充字段的值与所述第一结束帧填充字段的值相同。
  16. 根据权利要求15中所述的装置，其特征在于，所述第一A-MPDU承载于第一物理层协议数据单元PPDU中，所述第二A-MPDU子帧承载于第二PPDU中；
    所述第一PPDU包括位于所述第一A-MPDU之后的第一Pre-FEC padding，所述第二PPDU包括位于所述第二A-MPDU之后的第二Pre-FEC padding：
    其中，所述第一Pre-FEC padding和所述第二Pre-FEC padding相同。
  17. 一种通信装置，包括：存储器和处理器，所述存储器和所述处理器耦合，所述存储器用于存储计算机程序，计算机程序包括程序指令；所述处理器用于调用所述程序指令，使得所述通信装置实现如权利要求1至8中任一项所述的方法。
  18. 一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序，所述计算机程序包含至少一段代码，所述至少一段代码由计算机执行，以控制所述计算机执行如权利要求1至8中任一项所述的方法。
  19. 一种计算机程序，当所述计算机程序被计算机执行时，用于执行如权利要求1至8中任一所述的方法。
  20. 一种装置，用于实现权利要求1至8中任一项所述的方法。
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EP3996300A1 (en) 2022-05-11
US20220149991A1 (en) 2022-05-12
EP3996300A4 (en) 2022-08-03

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