WO2021218367A1 - 一种应用于无线局域网的带宽指示方法及通信装置 - Google Patents

一种应用于无线局域网的带宽指示方法及通信装置 Download PDF

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Publication number
WO2021218367A1
WO2021218367A1 PCT/CN2021/078870 CN2021078870W WO2021218367A1 WO 2021218367 A1 WO2021218367 A1 WO 2021218367A1 CN 2021078870 W CN2021078870 W CN 2021078870W WO 2021218367 A1 WO2021218367 A1 WO 2021218367A1
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field
bandwidth
eht
ppdu
sig
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PCT/CN2021/078870
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English (en)
French (fr)
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于健
狐梦实
淦明
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华为技术有限公司
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Priority to EP21795585.5A priority Critical patent/EP4138448A4/en
Priority to JP2022566285A priority patent/JP2023523813A/ja
Priority to AU2021264578A priority patent/AU2021264578A1/en
Priority to KR1020227041732A priority patent/KR20230003160A/ko
Priority to BR112022021991A priority patent/BR112022021991A2/pt
Publication of WO2021218367A1 publication Critical patent/WO2021218367A1/zh
Priority to US17/976,225 priority patent/US20230061290A1/en
Priority to US18/355,940 priority patent/US20230361951A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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

  • the present invention relates to the field of communication, and in particular to a bandwidth indication method and communication device applied to a wireless local area network.
  • WLAN Wi-Fi
  • 802.11n High Throughput
  • 802.11ac Low Throughput
  • 802.11ax High Efficient
  • 802.11be High Efficient
  • EHT Extremely High Throughput
  • 802.11ax In terms of bandwidth configuration, 802.11ax currently supports the following bandwidth configurations: 20MHz, 40MHz, 80MHz, 160MHz and 80+80MHz. Among them, the difference between 160MHz and 80+80MHz is that the former is a continuous frequency band, while the two 80MHz of the latter can be separated. In 802.11be, configurations such as 240MHz and 320MHz will be supported.
  • the allocation of user frequency band resources is not based on a 20MHz channel, but based on a resource unit (RU).
  • the form of the RU can be 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU or 996-tone RU, etc., and tone represents a subcarrier.
  • Fig. 1 is a schematic diagram of 80MHz sub-carrier distribution and RU distribution. As shown in Figure 1, when the bandwidth is 80MHz, the entire bandwidth is composed of 4 resource units of 242-tone RU as a unit. In particular, in the middle of the entire bandwidth, there is also a resource unit composed of two 13-tone subunits. 26-tone RU in the middle. Alternatively, the entire bandwidth may be composed of an entire 996-tone RU, or may be composed of various combinations of 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, and 484-tone RU.
  • 802.11ax has provided downlink (DL) orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) and downlink (DL) multi-user (multiple user, MU) multiple input multiple access Output (multiple input multiple output, MIMO) resource unit indication method.
  • the sender sends a physical protocol data unit (PPDU), which contains high-efficiency-signal-field-A (high-efficient-signal-field-A) and high-efficiency-signal-field-B (high efficient-signal field-B).
  • PPDU physical protocol data unit
  • HE-SIG-A is used to indicate the symbol length of HE-SIG-B, the modulation and coding scheme (MCS) of HE-SIG-B, the bandwidth of the entire PPDU, and so on. If the PPDU bandwidth is greater than 20MHz, HE-SIG-A will replicate and transmit on every 20MHz.
  • the PPDU also contains HE-SIG-B, which provides resource indication information for DL MU MIMO and DL OFDMA.
  • HE-SIG-B is individually coded on each 20MHz.
  • the coding structure of HE-SIG-B on each 20MHz is shown in Figure 2. Among them, the entire HE-SIG-B is divided into two parts, namely a common field and a user specific field.
  • the common field contains 1 to N resource unit allocation subfields (RU allocation subfield), and the middle 26-subcarrier (Center26-Tone) resource unit indication field that exists when the bandwidth is greater than or equal to 80MHz, and then the loop for verification Cyclic Redundancy Code (CRC) and Tail subfields for cyclic decoding.
  • RU allocation subfield resource unit allocation subfield
  • Center26-Tone middle 26-subcarrier
  • CRC Cyclic Redundancy Code
  • Tail subfields for cyclic decoding.
  • the user-specific field there are 1 to M user fields in the order of resource unit allocation.
  • the M user fields are usually two as a group, and every two user fields are followed by a CRC and Tail field, but the last group should be excluded. In the last group, there may be 1 or 2 user fields.
  • FIG. 3 is a schematic diagram of the HE-SIG-B field when the PPDU bandwidth is 80 MHz. As shown in Figure 3, when the PPDU bandwidth is 80MHz, there are 2 CCs in the HE-SIG-B field, a total of 4 channels, the overall structure is in the 4 channels according to the frequency from low to high according to the structure of CC1, CC2, CC1, and CC2 The above indicates the resource unit allocation information.
  • CC1 contains the first and third resource unit allocation subfields within the range of 242-tone RU and the corresponding user field;
  • CC2 contains the second and fourth resource unit subfields within the range of 242-tone RU Fields and corresponding user fields.
  • an 80MHz middle 26-tone RU indication is carried, indicating whether the resource unit is used for data transmission.
  • the PPDU bandwidth is 160MHz
  • there are 2 CCs in the HE-SIG-B field a total of 8 channels, according to the frequency from low to high according to CC1, CC2, CC1, CC2, CC1, CC2, CC1, CC2
  • the structure indicates resource unit allocation information on 8 channels.
  • CC1 includes the first, third, fifth, and seventh resource unit allocation subfields within the scope of 242-tone RU and the corresponding user fields;
  • CC2 includes the second, fourth, and fourth The six and eighth 242-tone RU resource unit subfields and corresponding user fields.
  • the prior art realizes resource unit indication in the case of 20 MHz to 160 MHz, but the overhead is relatively large.
  • Wi-Fi7 or later standards for example, Wi-Fi8
  • the transmission bandwidth of the PPDU can be 240MHz or 320MHz or greater
  • the resource unit indication in the PPDU will increase exponentially. Therefore, how to reduce the signaling overhead of PPDU transmission of PPDUs is a problem to be solved urgently at present.
  • the embodiment of the present invention provides a bandwidth indication method and communication device applied to a wireless local area network, which is beneficial to reducing the signaling overhead of PPDU transmission.
  • this application provides a bandwidth indication method applied to a wireless local area network.
  • the method includes: an access point generates a physical layer protocol data unit PPDU, wherein the transmission bandwidth of the PPDU is divided into multiple fragments, and the PPDU It includes the universal signaling U-SIG field carried on a slice.
  • the U-SIG field includes a bandwidth field.
  • the bandwidth field indicates the channel bandwidth of the allocated resource unit of the station docked in the slice; the access point sends a PPDU to the station.
  • the resources included in the EHT-SIG field of the fragment are The number of unit allocation subfields can correspond to the channel bandwidth of the resource unit allocated by the site, and only the resource indication information corresponding to the channel bandwidth indicated by the bandwidth field can be carried on the fragment, which is beneficial to reduce the PPDU transmission Signaling overhead. And it can also allocate cross-shard resources to the site, which can allocate resources to the site more flexibly compared to the resource unit that can only be allocated to the site's shards where it is docked.
  • the PPDU also includes the EHT-SIG field carried on a fragment; the EHT-SIG field includes the resource unit allocation subfield, the bandwidth indicated by the bandwidth field and the resource unit allocation subfield included in the EHT-SIG field Corresponding to the number of fields, the resource unit allocation subfield is used to indicate the resource units allocated for the stops in the segment.
  • the bandwidth indicated by the bandwidth field of the fragment to the number of resource unit allocation subfields included in the EHT-SIG field
  • only the resource indication information corresponding to the channel bandwidth indicated by the bandwidth field can be carried on the fragment, It is beneficial to reduce the signaling overhead of PPDU transmission. And it can also allocate cross-shard resources to the site, which can allocate resources to the site more flexibly compared to the resource unit that can only be allocated to the site's shards where it is docked.
  • the U-SIG field further includes a compressed field, and if the compressed field indicates a non-compressed mode, the EHT-SIG field includes a resource unit allocation subfield.
  • the compressed field indicates the uncompressed mode.
  • Case 1 The channel bandwidth indicated by the bandwidth field is used for OFDMA transmission.
  • Case 2 The channel bandwidth indicated by the bandwidth field is used for OFDMA transmission, and the resources of the stops in the slice are used for OFDMA transmission.
  • whether to compress the EHT-SIG field can be determined at the granularity of fragmentation, which is beneficial to reducing the signaling overhead of PPDU transmission.
  • the bandwidth indicated by the bandwidth field is 40 MHz in megahertz
  • the U-SIG field and the EHT-SIG field are transmitted on the 40 MHz bandwidth. Compared with transmitting the U-SIG field and the EHT-SIG field on the entire slice, this is beneficial to reduce the signaling overhead of PPDU transmission.
  • the correspondence between the bandwidth indicated by the bandwidth field and the number of resource unit allocation subfields included in the EHT-SIG field includes one or more of the following: if the bandwidth indicated by the bandwidth field is 20 Megahertz MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 1; if the bandwidth indicated by the bandwidth field is 40 MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 2; If the bandwidth indicated by the bandwidth field is 80MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 4; if the bandwidth indicated by the bandwidth field is 160MHz, then the resource unit allocation subfields included in the EHT-SIG field If the bandwidth indicated by the bandwidth field is 240MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 12; or, if the bandwidth indicated by the bandwidth field is 320MHz, then the EHT-SIG The number of resource unit allocation subfields included in the field is 16. Based on this possible
  • the EHT-SIG field includes a preamble puncturing indication field, and the preamble puncturing indication field is used to indicate that the channel bandwidth indicated by the bandwidth field is punctured.
  • the number of bits required for the preamble puncturing indication field is less than the number of bits required for the resource unit allocation subfield. Therefore, the preamble puncturing indication field is used to replace the resource unit allocation subfield to indicate the resource unit allocation of the site, which is beneficial Reduce the signaling overhead of PPDU transmission.
  • the U-SIG field further includes a compression field. If the compression field indicates a compression mode, the EHT-SIG field includes a preamble puncturing indication field.
  • the compression field indicates the compression mode.
  • the EHT-SIG field can be compressed at the granularity of fragmentation, which is beneficial to reduce the signaling overhead of PPDU transmission.
  • the EHT-SIG field may include a resource unit allocation subfield.
  • the resource unit allocation subfield is used to implement the function of the preamble puncturing indication field, that is, it is used to indicate that the channel bandwidth indicated by the bandwidth field is punctured.
  • the resource unit allocation subfield is used to indicate the resource unit allocation of the site.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the preamble puncturing indication field is also used to indicate the number of MU-MIMO users.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the PPDU also includes the first field carried in the fragment, and the first field is used to indicate the multi-user multi-input multi-output MU -The number of MIMO users, the first field is different from the preamble puncturing indication field.
  • the PPDU also includes the EHT-SIG field carried on a slice, and the U-SIG field also includes a compression field. If the transmission bandwidth of the PPDU is used for non-orthogonal frequency division multiple access OFDMA transmission, the compression The field indicates the compression mode. When the compression field indicates the compression mode, the EHT-SIG field does not include the resource unit allocation subfield. The EHT-SIG field can be compressed with the entire transmission bandwidth of the PPDU as the granularity, which is beneficial to reduce the signaling overhead of PPDU transmission.
  • the U-SIG field is also used to indicate the number of MU-MIMO users.
  • the EHT-SIG field includes a preamble puncturing indication field, and the preamble puncturing indication field is used to indicate that the transmission bandwidth of the PPDU is punctured.
  • the preamble puncturing indication field is used to replace the resource unit allocation subfield to indicate the resource unit allocation status of the station, which is beneficial to reduce the signaling overhead of PPDU transmission.
  • the EHT-SIG fields carried on multiple fragments included in the PPDU are the same. Based on this possible implementation, the reliability of EHT-SIG field transmission can be increased.
  • the present application provides a bandwidth indication method applied to a wireless local area network.
  • the method includes: a station receives a physical layer protocol data unit PPDU sent by an access point, wherein the transmission bandwidth of the PPDU is divided into multiple fragments,
  • the PPDU includes the universal signaling U-SIG field carried on a fragment.
  • the U-SIG field includes the bandwidth field.
  • the bandwidth field indicates the channel bandwidth of the resource unit allocated by the station that stops in the fragment; the station is based on the received U-SIG The field determines the channel bandwidth where the allocated resource unit is located.
  • a communication device in a third aspect, may be an access point, or a device in the access point, or a device that can be matched and used with the access point. Wherein, the communication device may also be a chip system.
  • the communication device can perform the method described in the first aspect.
  • the function of the communication device can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the unit can be software and/or hardware.
  • a communication device in a fourth aspect, may be a site, a device in a site, or a device that can be matched and used with the site. Wherein, the communication device may also be a chip system.
  • the communication device can perform the method described in the second aspect.
  • the function of the communication device can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the unit can be software and/or hardware.
  • the present application provides a communication device that includes at least one processor, and when the processor invokes a computer program in a memory, the method executed by the access point in the method described in the first aspect is Be executed.
  • the present application provides a communication device that includes at least one processor, and when the processor invokes a computer program in a memory, the method executed by the station in the method described in the second aspect is executed .
  • the present application provides a communication device.
  • the communication device includes a processor and a memory, where the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory to enable the The communication device executes the method executed by the access point in the method described in the first aspect.
  • the present application provides a communication device.
  • the communication device includes a processor and a memory.
  • the memory is used to store a computer program; the processor is used to execute the computer program stored in the memory to enable the The communication device executes the method executed by the station in the method described in the second aspect.
  • the present application provides a communication device.
  • the communication device includes a processor, a memory, and a transceiver.
  • the transceiver is used to receive or send a signal;
  • the memory is used to store a computer program;
  • the processor is configured to call the computer program from the memory to execute the method executed by the access point in the method described in the first aspect.
  • the present application provides a communication device, the communication device includes a processor, a memory, and a transceiver, the transceiver is used to receive or send a signal; the memory is used to store a computer program; the The processor is configured to call the computer program from the memory to execute the method executed by the station in the method described in the second aspect.
  • the present application provides a communication device.
  • the communication device includes at least one processor and a communication interface.
  • the communication interface is configured to receive a computer program and transmit it to the processor;
  • the computer program is used to execute the method performed by the access point in the method described in the first aspect.
  • the present application provides a communication device, the communication device includes at least one processor and a communication interface, and the processor runs a computer program to execute the method performed by the site in the method described in the second aspect.
  • the present application provides a computer-readable storage medium for storing instructions.
  • the access point executes the method described in the first aspect. The method is implemented.
  • the present application provides a computer-readable storage medium for storing instructions. When the instructions are executed, the method performed by the site in the second aspect is realized.
  • the present application provides a computer program product including instructions, when the instructions are executed, the method executed by the access point in the method described in the first aspect is realized.
  • the present application provides a computer program product including instructions, which when executed, enable the method executed by the site in the second aspect to be implemented.
  • FIG. 1 is a schematic diagram of 80MHz subcarrier distribution and RU distribution provided by an embodiment of the present application
  • Fig. 2 is a coding structure of HE-SIG-B on 20 MHz provided by an embodiment of the present application;
  • FIG. 3 is a schematic diagram of the HE-SIG-B field when the PPDU bandwidth is 80 MHz according to an embodiment of the present application;
  • FIG. 4 is a schematic diagram of a 20MHz subcarrier distribution and RU distribution provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a 40MHz subcarrier distribution and RU distribution provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a frame structure of an HE MU PPDU provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the HE-SIG-B field when the bandwidth of the HE MU PPDU is 20 MHz according to an embodiment of the present application;
  • FIG. 8 is a schematic diagram of the HE-SIG-B field when the bandwidth of the HE MU PPDU is 40 MHz according to an embodiment of the present application;
  • FIG. 9 is a schematic diagram of the HE-SIG-B field when the bandwidth of the HE MU PPDU is 160 MHz according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a frame structure of an EHT MU PPDU provided by an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a system architecture provided by an embodiment of the present application.
  • FIG. 12 is a schematic flowchart of a bandwidth indication method applied to a wireless local area network according to an embodiment of the present application
  • FIG. 13 is a schematic diagram of a fragmentation provided by an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a channel and channel bandwidth allocation of stations parked in fragment 1 according to an embodiment of the application;
  • FIG. 15 is a schematic diagram of a channel and channel bandwidth allocation of stations parked in fragment 2 according to an embodiment of the application;
  • FIG. 16 is a schematic diagram of a channel and channel bandwidth allocation of stations parked in fragment 3 according to an embodiment of the application;
  • FIG. 17 is a schematic diagram of a channel and channel bandwidth allocation of stations parked in fragment 4 according to an embodiment of the application.
  • FIG. 18 is a schematic diagram of a PPDU frame structure provided by an embodiment of this application.
  • FIG. 19 is a schematic diagram of another PPDU frame structure provided by an embodiment of this application.
  • FIG. 20 is a schematic diagram of another PPDU frame structure provided by an embodiment of this application.
  • FIG. 21 is a schematic diagram of an EHT-SIG field 1 provided by an embodiment of this application.
  • FIG. 22 is a schematic diagram of an EHT-SIG field 2 provided by an embodiment of this application.
  • FIG. 23 is a schematic diagram of an EHT-SIG field 3 provided by an embodiment of this application.
  • FIG. 24 is a schematic diagram of an EHT-SIG field 4 provided by an embodiment of this application.
  • FIG. 25 is a schematic diagram of another PPDU frame structure provided by an embodiment of this application.
  • FIG. 26 is a schematic diagram of another PPDU frame structure provided by an embodiment of the application.
  • FIG. 27 is a schematic diagram of another PPDU frame structure provided by an embodiment of this application.
  • FIG. 28 is a schematic diagram of a frame structure of another PPDU provided by an embodiment of this application.
  • FIG. 29 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 30a is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 30b is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • Multiple means two or more.
  • “And/or” describes the association relationship of the associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone.
  • the character “/” generally indicates that the associated objects before and after are in an "or” relationship.
  • WLAN Wired Local Area Network
  • 802.11a/b/g 802.11n
  • 802.11ac 802.11ax
  • 802.11be 802.11be
  • Table 1 The bandwidth configurations supported by the PPDUs of the above WLAN standards are shown in Table 1 below:
  • the allocation of user frequency band resources is not based on a 20MHz channel, but based on a resource unit (RU).
  • the form of the RU can be 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU or 996-tone RU, etc., and tone represents a subcarrier.
  • FIG. 4 is a schematic diagram of 20 MHz subcarrier distribution and RU distribution provided by an embodiment of the application.
  • the bandwidth when the bandwidth is 20 MHz, the entire bandwidth can be composed of a whole 242-tone RU, or can be composed of various combinations of 26-tone RU, 52-tone RU, and 106-tone RU.
  • the bandwidth also includes some guard subcarriers, empty subcarriers (the subcarrier where 1 is in the figure is an empty subcarrier, where 1 means that the number of empty subcarriers is 1), or DC ( Direct Current, DC) subcarrier.
  • DC Direct Current, DC
  • FIG. 5 is a schematic diagram of a 40 MHz subcarrier distribution and RU distribution provided by an embodiment of this application.
  • the bandwidth when the bandwidth is 40MHz, the entire bandwidth is roughly equivalent to a copy of the subcarrier distribution of 20MHz.
  • the entire bandwidth can consist of an entire 484-tone RU, or 26-tone RU, 52-tone RU, Various combinations of 106-tone RU and 242-tone RU.
  • FIG. 1 is a schematic diagram of 80 MHz sub-carrier distribution and RU distribution provided by an embodiment of this application.
  • the bandwidth when the bandwidth is 80MHz, the entire bandwidth is composed of 4 resource units of 242-tone RU as the unit.
  • 26-tone RU in the middle.
  • the entire bandwidth can be composed of an entire 996-tone RU, or can be composed of various combinations of 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, and 484-tone RU.
  • the entire bandwidth can be regarded as a copy of two 80Mhz sub-carrier distributions.
  • the entire bandwidth can consist of a whole 2*996-tone RU, or 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU, 996-tone RU in various combinations.
  • Orthogonal frequency division multiple access (OFDMA) transmission and non-OFDMA transmission OFDMA
  • OFDMA transmission is a multi-user communication mechanism, which is applicable to the 802.11ax standard and later access points (AP) and non-access point stations (none access point station, non-AP STA).
  • AP access point
  • non-AP STA one access point station
  • the entire transmission bandwidth can be divided into multiple RUs, which are allocated to different users.
  • non-OFDMA transmission the entire transmission bandwidth as a whole is used for single user (single user, SU) or multi-user multiple input multiple output (MU-MIMO) transmission.
  • SU single user
  • MU-MIMO multi-user multiple input multiple output
  • For non-OFDMA transmission after the preamble puncturing, the remaining unpunctured part will form multiple RUs, and multiple RUs are combined as a whole.
  • the combination of multiple RUs supported by non-OFDMA transmission is equivalent to the combination of preamble puncturing supported by non-OFDMA transmission.
  • HE MU PPDU is mainly used for DLOFDMA and DLMU-MIMO transmission in 802.11ax.
  • Figure 6 is a schematic diagram of the structure of HE MU PPDU. As shown in Figure 6, HE MU PPDU is divided into preamble and data field parts. The preamble part includes high efficient-signal field-A (HE-SIG-A) and high-efficiency signal field-A (HE-SIG-A). Let-field-B (high efficient-signal field-B, HE-SIG-A) two parts of HE signaling fields. Among them, for the relevant description of HE-SIG-A and HE-SIG-B, please refer to the description in the background art.
  • the resource unit allocation subfield in HE-SIG-B is 8 bits, and all possible resource unit permutations and combinations in 242-tone RU are indicated by way of index.
  • the index is used to indicate the number of users (that is, the number of STAs) that perform SU/MU-MIMO transmission in the RU.
  • the index of the resource unit allocation subfield is shown in Table 2:
  • the first column represents the 8-bit index of the resource unit allocation subfield
  • the middle columns #1 to #9 represent the permutation and combination of different resource units.
  • Each row in Table 2 represents a type of RU allocation.
  • the index 00111y2y1y0 indicates that 4 RUs of 52-tone RU, 52-tone RU, 26-tone RU, and 106-tone RU are allocated.
  • the numbers in Table 2 are used to indicate the number of users included in the 106-tone RU.
  • 00010y 2 y 1 y 0 corresponds to the number of 8, because while indicating resource unit allocation, y 2 y 1 y 0 is also used to indicate the number of users contained in the 106-tone RU, corresponding to 1 ⁇ 8 users (ie sites). Among them, each value of y 2 y 1 y 0 can be 0 or 1.
  • the order in which users appear in the user-specific field is consistent with the order of RUs divided in the corresponding resource unit allocation subfield.
  • the user can identify whether the user field belongs to him or not by reading the site identifier in the user field. Combining the position where the user field appears and the corresponding resource unit allocation subfield, the user can know his own RU allocation situation.
  • Most of the RU allocation in Table 2 is within the range of 242-tone, and a small number of RUs indicated by the index are 242-tone RU, 484-tone RU, and 996-tone RU.
  • 242-tone RU As the unit, the left side of Figure 1, Figure 4 or Figure 5 can be regarded as the lowest frequency, and the right side of the figure can be regarded as the highest frequency. From left to right, 242-tone RU can be labeled: 1#,2#,...,8#.
  • 802.11ax introduces the concept of content channels. For example, as shown in Figure 7, when the bandwidth of the HE MU PPDU is only 20 MHz, the HE-SIG-B field only contains one content channel CC1, which contains one resource unit allocation subfield, which is used to indicate the data part 242 -Indication of resource unit allocation within toneRU.
  • the HE-SIG-B field includes two content channels, CC1 and CC2.
  • CC1 contains the resource unit allocation subfield within the first 242-tone RU range and the corresponding user field;
  • CC2 contains the second resource unit allocation subfield within the range of 242-tone RU and the corresponding user field.
  • the HE-SIG-B field still includes 2 CCs, a total of 4 channels, so the overall frequency is in accordance with CC1, CC2, CC1, from low to high.
  • the structure of CC2 indicates resource unit allocation information on 4 channels.
  • CC1 includes the first and third 242-tone RU resource unit allocation subfields and the corresponding user fields within the range;
  • CC2 includes the second and fourth 242-tone RU ranges The resource unit subfields within and the corresponding user fields within its scope.
  • an 80MHz middle 26-tone RU indication is carried, indicating whether the resource unit is used for data transmission.
  • the HE-SIG-B field still includes 2 CCs, a total of 8 channels, so the overall frequency is as follows CC1, CC2, CC1,
  • the structure of CC2, CC1, CC2, CC1, CC2 indicates resource unit allocation information on 8 channels.
  • CC1 includes the first, third, fifth, and seventh resource unit allocation subfields within the range of 242-tone RU and the corresponding user fields within the range;
  • CC2 includes the second, The fourth, sixth, and eighth 242-tone RU resource unit subfields and the corresponding user fields within the range.
  • an 80MHz middle 26-tone RU indication is carried, indicating whether the resource unit is used for data transmission.
  • Extremely high throughput multi-user physical layer protocol data unit Extremely high throughput multiple userphysical layer protocol data unit, EHT MU PPDU
  • EHT MU PPDU is introduced in 802.11be.
  • EHT MU PPDU is mainly used for DL OFDMA and DL MU-MIMO transmission in 802.11be.
  • the currently proposed EHT MU PPDU frame structure mainly includes the traditional short training sequence (legacy short training, L-STF) field, the traditional long training sequence (legacy long training, L-LTF) field, and the traditional signaling (legacy signal, L-SIG) field, repeated legacy signal (RL-SIG) field, universal signal (U-SIG) field, extremely high throughput- signal, EHT-SIG) field, EHT short training (EHT-STF) field, EHT long training (EHT-LTF) field and data field.
  • the EHT-SIG field can include two parts, the first part of the common field (common field) contains 1 to N resource unit allocation subfields (resource unit allocation subfield); the second part of the user specific field (user specific field), according to the resource unit In the order of allocation, there are 1 to M user fields.
  • 802.11ax implements resource unit indication in the case of 20M ⁇ 160MHz, but its overhead is relatively large.
  • each CC contains 4
  • Each resource unit is allocated with sub-indication fields, and it contains all the user fields in the four 242-tone RUs.
  • the signaling overhead of PPDU transmission is relatively large.
  • the 802.11be standard or later standards when the transmission bandwidth of EHT MU PPDU is larger, the signaling overhead will further increase.
  • embodiments of the present application provide a bandwidth indication method and communication device applied to a wireless local area network.
  • FIG. 11 is a schematic diagram of the system architecture provided by an embodiment of the application.
  • the system architecture may include access point (AP) type stations and non-access point type stations (none access point). station, non-AP STA).
  • AP access point
  • STA non-access point type stations
  • the system architecture can include one or more access points, as well as one or more sites.
  • Figure 11 includes one access point and three sites as an example.
  • the access point can be the access point for terminal equipment (such as mobile phones) to enter the wired (or wireless) network. It is mainly deployed in homes, buildings and parks. The typical coverage radius is tens of meters to hundreds of meters. Can be deployed outdoors.
  • the access point is equivalent to a bridge connecting the wired network and the wireless network. The main function is to connect each wireless network client together, and then connect the wireless network to the Ethernet.
  • the access point may be a terminal device (such as a mobile phone) or a network device (such as a router) with a wireless fidelity (WiFi) chip.
  • WiFi wireless fidelity
  • the access point can be a device that supports the 802.11be standard.
  • the access point may also be a device supporting multiple wireless local area networks (WLAN) standards of the 802.11 family such as 802.11be, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • WLAN wireless local area networks
  • the access point in this application may be a high-efficiency (HE) AP or an extremely high throughput (EHT) AP, or it may be an access point that is applicable to a future generation of WiFi standards.
  • HE high-efficiency
  • EHT extremely high throughput
  • the site can be a wireless communication chip, a wireless sensor, or a wireless communication terminal, etc., and can also be referred to as a user.
  • the site can be a mobile phone that supports WiFi communication function, a tablet computer that supports WiFi communication function, a set-top box that supports WiFi communication function, a smart TV that supports WiFi communication function, a smart wearable device that supports WiFi communication function, and WiFi communication function is supported.
  • the station can support the 802.11be standard.
  • the site can also support multiple wireless local area networks (WLAN) standards of the 802.11 family such as 802.11be, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a.
  • WLAN wireless local area networks
  • access points and sites can be devices used in the Internet of Vehicles, Internet of Things (IoT) nodes, sensors, etc., smart cameras, smart remote controls, smart water meters, and electricity meters in smart homes. And sensors in smart cities, etc.
  • IoT Internet of Things
  • the technical solution of this application can be applied to data communication between an access point and one or more sites, is also applicable to communication between an access point and multiple access points, and is also applicable to a site and multiple sites Communication.
  • the technical solution of the present application will be described below by taking data communication between an access point and multiple sites as an example.
  • FIG. 12 is a schematic flowchart of a bandwidth indication method applied to a wireless local area network according to an embodiment of the present application.
  • the bandwidth indication method applied to a wireless local area network includes the following steps 1201 to 1203.
  • the method shown in FIG. 12 may be executed by an access point and a station.
  • the execution subject of the method shown in FIG. 12 may be a chip in an access point and a chip in a site.
  • Fig. 12 takes the access point and the station as the executive body as an example for description.
  • An access point generates a PPDU, where the transmission bandwidth of the PPDU is divided into multiple fragments, the PPDU includes a U-SIG field carried on one fragment, the U-SIG field includes a bandwidth field, and the bandwidth field indicates The bandwidth of the channel where the resource unit allocated to the station docked in the fragment is located.
  • the PPDU may be an EHT MU PPDU, or the PPDU may be a PPDU in other 802.11 standards, which is not limited in the embodiment of the present application.
  • the transmission bandwidth of the PPDU can be 20MHz, 40MHz, 80MHz, 160MHz/80+80MHz, 240MHz or 320MHz, etc.
  • the names of the fields in the full text of the embodiments of the present application may also be other names. For example, they may be called U-SIG fields and bandwidth fields in 802.11be, but may also be called other field names in standards after 802.11be.
  • the "field” described herein may also be referred to as "domain”, “information”, etc., and “subfield” may be referred to as “subfield”, “information”, etc.
  • the transmission bandwidth of the PPDU is divided into multiple fragments.
  • One slice can be 80MHz.
  • one slice can also be 20MHz, 40MHz, 160MHz, or the like.
  • One or more sites are docked in some or all of the multiple shards.
  • the transmission bandwidth of the PPDU is 320 MHz, and one slice is 80 MHz. As shown in Figure 13, 320MHz includes 16 channels, and one channel is equivalent to 20MHz.
  • the transmission bandwidth of the PPDU is divided into fragment 1 to fragment 4, and each fragment is 80 MHz.
  • Shard 1 stops at sites 1 to 5, shard 2 stops at sites 6 and 7, shard 3 stops at site 8, and shard 4 stops at site 9.
  • the bandwidth size of different fragments may also be different.
  • the 320 MHz transmission bandwidth of the PPDU is divided into slice 1 to slice 3.
  • the slice 1 is 80 MHz
  • the slice 2 is 80 MHz
  • the slice 3 is 160 MHz.
  • the channel and channel bandwidth of the stations that stop in each fragment can be predefined.
  • Figure 14 shows the allocation of channels and channel bandwidths of stations parked in Fragment 1.
  • the pre-defined channels of the stops in the segment 1 include: the primary 20MHz channel (or primary channel for short, Primary20MHz, P20), the secondary 20MHz channel (Secondary 20MHz, S20), and the secondary 40MHz channel (Secondary 40MHz).
  • S40 from 80MHz (Secondary 80MHz, S80) channel and from 160MHz (Secondary 160MHz, S40) channel.
  • Channel 13 corresponds to the main 20MHz channel.
  • Channel 14 corresponds to the 20MHz channel.
  • Channel 15 and channel 16 are combined into a 40MHz channel.
  • Channel 9 to channel 12 are combined into 80MHz channels.
  • Channel 1 to channel 8 are combined into a 160MHz channel.
  • the pre-defined channel bandwidths of stations stopped in slice 1 may include one or more of 20 MHz, 40 MHz, 80 MHz, 160 MHz, 240 MHz, and 320 MHz. If the transmission bandwidth of the PPDU is greater than 320MHz, the predefined channel bandwidth can also be greater than 320MHz.
  • Figure 14 takes the pre-defined channel bandwidths of the stops in Fragment 1 including 80MHz, 160MHz, 240MHz, and 320MHz as an example. As shown in Figure 14, if the allocated resource unit of the site docked in shard 1 is in shard 1, and is not in shard 2 to 4, then the resource unit of the site docked in shard 1 is allocated The channel bandwidth is 80MHz.
  • the channel bandwidth of the allocated resource unit of the site docked in fragment 1 is 160MHz . If the allocated resource unit of the site docked in fragment 1 is in fragment 3 and not in fragment 4, the channel bandwidth of the allocated resource unit of the site docked in fragment 1 is 240 MHz. If the allocated resource unit of the station docked in fragment 1 is in the fragment 4, the channel bandwidth of the allocated resource unit of the station docked in fragment 1 is 320 MHz.
  • the allocation of channels and channel bandwidths of stations parked in Fragment 2 is shown in Figure 15.
  • the distribution of channels and channel bandwidth of the stations parked in fragment 3 is shown in FIG. 16, and the distribution of channels and channel bandwidth of the stations parked in fragment 4 is shown in FIG. 17.
  • the principle of determining the channel bandwidth of the allocated resource unit of the station in fragment 2 or fragment 3 or fragment 4 is the same as that of fragment 1, and will not be repeated here.
  • the PPDU also includes the data part of the stops in the fragment.
  • the allocated resource unit of the site is used to carry the data portion received by the site, and the site can receive its own data on the allocated resource unit. Therefore, the bandwidth field indicating the channel bandwidth of the allocated resource unit of the station parked in the slice may also be equivalent to: the bandwidth field indicating the channel bandwidth of the data part of the station parked in the slice.
  • the transmission bandwidth of the PPDU is 320 MHz
  • the transmission bandwidth of the PPDU is divided into 4 slices, each slice has a size of 80 MHz, and each slice includes 4 channels.
  • the channel bandwidths defined in advance for Fragment 1 to Fragment 4 are shown in Figure 14 to Figure 17.
  • the PPDU includes the U-SIG field 1 carried on the fragment 1, and the U-SIG field 1 includes the bandwidth field 1.
  • the PPDU may also include the EHT-SIG field 1 carried on the fragment 1, which is used to indicate the allocated resource units of the stops in the fragment 1.
  • the PPDU also includes data part 1 for sending to stations 1 to 5.
  • the bandwidth of the channel where the data part 1 is located is 80 MHz (that is, the bandwidth of the channel where the allocated resource units of the stations 1 to 5 are located is 80 MHz). Therefore, the channel bandwidth indicated by the bandwidth field 1 is 80 MHz.
  • the PPDU also includes the U-SIG field 2 carried on the fragment 2, and the U-SIG field 2 includes the bandwidth field 2.
  • the PPDU may also include the EHT-SIG field 2 carried on the fragment 2, which is used to indicate the resource unit allocated to the stops in the fragment 2.
  • the PPDU also includes a data part 2 for sending to the station 6 and a data part 3 for sending to the station 7.
  • the channel bandwidth where the data part 2 and the data part 3 are located is 80 MHz (that is, the channel bandwidth where the resource units allocated to the station 6 and the station 7 are located is 80 MHz). Therefore, the channel bandwidth indicated by the bandwidth field 2 is 80 MHz.
  • the PPDU also includes the U-SIG field 3 carried on the fragment 3, and the U-SIG field 3 includes the bandwidth field 3.
  • the PPDU may also include the EHT-SIG field 3 carried on the fragment 3, which is used to indicate the resource unit allocated to the station that stops in the fragment 3.
  • the PPDU also includes a data part 4 for sending to the station 8.
  • the data part 4 exists in both slice 3 and slice 4. Therefore, the channel bandwidth where the data part 4 is located is 160 MHz (that is, the channel bandwidth where the resource unit allocated to the station 8 is located is 160 MHz). Therefore, the channel bandwidth indicated by the bandwidth field 3 is 160 MHz.
  • the PPDU also includes the U-SIG field 4 carried on the fragment 4, and the U-SIG field 4 includes the bandwidth field 4.
  • the PPDU may also include the EHT-SIG field 4 carried on the fragment 4, which is used to indicate the resource units to which the stations stopped in the fragment 4 are allocated.
  • the PPDU also includes a data part 5 for sending to the station 9.
  • the channel bandwidth where the data part 5 is located is 80 MHz (that is, the channel bandwidth where the resource unit allocated to the station 9 is located is 80 MHz). Therefore, the channel bandwidth indicated by the bandwidth field 4 is 80 MHz.
  • the PPDU may also include only the U-SIG field and the EHT-SIG field on part of the fragments.
  • the PPDU may not include the U-SIG field 4 and EHT-SIG field 4 carried on fragment 4, that is, the access point does not need to be in the partition.
  • Slice 4 sends U-SIG field 4 and EHT-SIG field 4, which helps to save the signaling overhead of PPDU transmission.
  • the PPDU may also include the U-SIG field and EHT-SIG field on all slices.
  • the U-SIG field and the EHT-SIG field can be transmitted on partial channels of the fragment in the following three cases.
  • Case 1 If the channel bandwidth indicated by the bandwidth field of a fragment is greater than or equal to the size of the fragment, but the channel of the fragment is punctured, the U-SIG field and EHT-SIG field carried in the fragment are in This part of the channel is transmitted.
  • the bandwidth field 1 indicates 80MHz
  • the resource units allocated to sites 1 to 5 are on channel 15 and channel 16 of fragment 1, that is, the channel bandwidth indicated by the bandwidth field 1 has 40MHz being beaten. hole. Therefore, U-SIG field 1 can only be transmitted on channel 15 and channel 16 of fragment 1.
  • the bandwidth field 4 indicates 80 MHz
  • the resource units allocated to the station 9 are on the channel 3 and channel 4 of the slice 4, which is equivalent to that the channel bandwidth indicated by the bandwidth field 4 has 40 MHz punctured. Therefore, U-SIG field 4 can only be transmitted on channel 3 to channel 4 of fragment 4.
  • the U-SIG field 1 and the EHT-SIG field 1 can also be sent on all channels of the fragment 1.
  • the U-SIG field 4 and the EHT-SIG field 4 may also be sent on all channels of the slice 4. This can increase the reliability of U-SIG field and EHT-SIG field transmission.
  • Case 2 If the channel bandwidth indicated by the bandwidth field of the fragment is 40 MHz, the U-SIG field and the EHT-SIG field carried in the fragment are transmitted on the 40 MHz.
  • the channel bandwidth indicated by the bandwidth field 1 is 40 MHz. Therefore, U-SIG field 1 and EHT-SIG field 1 can only be transmitted on channel 13 and channel 14 of fragment 1.
  • the channel bandwidth indicated by the bandwidth field 4 is 40 MHz. Therefore, U-SIG field 4 and EHT-SIG field 4 can only be transmitted on channel 1 to channel 2 of fragment 4.
  • U-SIG field 1 and EHT-SIG field 1 can also be transmitted on all channels of fragment 1
  • U-SIG field 4 and EHT-SIG field 4 can also be transmitted on all channels of fragment 4. This can increase the reliability of U-SIG field and EHT-SIG field transmission.
  • Case 3 If the channel bandwidth indicated by the bandwidth field of the fragment is 20 MHz, the U-SIG field and the EHT-SIG field carried in the fragment are transmitted on the 20 MHz.
  • the implementation principle of case 3 is the same as that when the channel bandwidth indicated by the bandwidth field of the fragment is 40 MHz, and will not be repeated here.
  • the access point sends a PPDU to the station.
  • the access point after generating the PPDU, the access point sends the PPDU to the station.
  • the station determines the channel bandwidth where the allocated resource unit is located according to the received U-SIG field.
  • the station will receive the PPDU on the segment where it stops. After receiving the U-SIG field, the station determines the channel bandwidth where the allocated resource unit is located according to the U-SIG field. Then the station can determine the resource unit allocated to the station in the channel bandwidth, and receive the data part of the PPDU for sending to the station on the resource unit.
  • stations 1 to 5 receive U-SIG field 1 on fragment 1, and according to U-SIG field 1, determine that the channel bandwidth of the allocated resource unit is 80 MHz. After the station 1 to the station 5 determine the resource unit allocated to the station 1 to the station 5 in the 80 MHz based on the EHT-SIG field 1, the data part 1 in the PPDU is received on the resource unit. The same is true for sites in other shards, so I won’t repeat them here.
  • the bandwidth field of the HE-SIG-A field transmitted on each channel is used to indicate the entire transmission bandwidth of the PPDU. For example, if the total transmission bandwidth of the PPDU is 320MHz.
  • the HE-SIG-B field in the PPDU includes CC1 and CC2.
  • CC1 and CC2 respectively include 8 resource unit allocation subfields.
  • CC1 and CC2 are sent on 8 channels respectively, that is, 8 resource unit allocations are sent on each channel Sub-field, so the signaling overhead of PPDU transmission is very large.
  • the entire transmission bandwidth of the PPDU can be fragmented, and the bandwidth field of the fragment can be set to indicate the channel bandwidth where the resource unit allocated to the station in the fragment is located. Therefore, the number of resource unit allocation subfields included in the EHT-SIG field of the fragment can correspond to the channel bandwidth of the resource unit allocated by the site, and only the channel bandwidth indicated by the bandwidth field can be carried on the fragment.
  • the resource indication information is helpful to reduce the signaling overhead of PPDU transmission. And it can also allocate cross-shard resources to the site, which can allocate resources to the site more flexibly compared to the resource unit that can only be allocated to the site's shards where it is docked.
  • the EHT-SIG field includes (or exists) a resource unit allocation subfield, and the bandwidth indicated by the bandwidth field corresponds to the number of resource unit allocation subfields included in the EHT-SIG field.
  • the bandwidth indicated by the bandwidth field of the fragment corresponds to the number of resource unit allocation subfields included in the EHT-SIG field.
  • the correspondence between the bandwidth indicated by the bandwidth field and the number of resource unit allocation subfields included in the EHT-SIG field includes one or more of the following: if the bandwidth indicated by the bandwidth field is 20 MHz, Then the number of resource unit allocation subfields included in the EHT-SIG field is 1; if the bandwidth indicated by the bandwidth field is 40MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 2; if the bandwidth field indicates If the indicated bandwidth is 80MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 4; if the bandwidth indicated by the bandwidth field is 160MHz, then the number of resource unit allocation subfields included in the EHT-SIG field is 8 If the bandwidth indicated by the bandwidth field is 240MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 12; or, if the bandwidth indicated by the bandwidth field is 320MHz, the resources included in the EHT-SIG field The number of unit allocation subfields is 16.
  • the PPDU includes the U-SIG field 1 and the EHT-SIG field 1 carried on the fragment 1, and the U-SIG field 1 includes the bandwidth field 1.
  • the channel bandwidth indicated by the bandwidth field 1 is 80 MHz. Because every 20MHz bandwidth corresponds to a resource unit allocation subfield. Therefore, EHT-SIG field 1 includes 4 resource unit allocation subfields.
  • EHT-SIG field 1 may include CC11 and CC12. According to the structure of CC11, CC12, CC11, and CC12, transmission is performed on the 4 channels of fragment 1.
  • the CC11 on slice 1 includes the resource unit allocation subfield 1 in the first 242-tone RU range 1, the resource unit allocation subfield 3 in the third 242-tone RU range, and the corresponding User-specific fields.
  • the CC 12 on slice 1 includes the resource unit allocation subfield 2 in the second 242-tone RU range 2, the resource unit allocation subfield 4 in the fourth 242-tone RU range, and the corresponding user-specific field.
  • the PPDU also includes the U-SIG field 2 and the EHT-SIG field 2 carried on the fragment 2, and the U-SIG field 2 includes the bandwidth field 2.
  • the channel bandwidth indicated by the bandwidth field 2 is 80 MHz. Therefore, the EHT-SIG field 2 includes 4 resource unit allocation subfields.
  • the EHT-SIG field 2 may include CC21 and CC22. According to the structure of CC21, CC22, CC21, and CC22, transmission is carried out on the 4 channels of Fragment 2.
  • CC21 on slice 2 includes resource unit allocation subfield 5 within the fifth 242-tone RU range, resource unit allocation subfield 7 within the seventh 242-tone RU range, and corresponding User-specific fields.
  • the CC 22 on slice 2 includes the sixth resource unit allocation subfield 6 within the range of 242-tone RU, the eighth resource unit allocation subfield 8 within the range of 242-tone RU, and the corresponding user-specific field.
  • the PPDU also includes the U-SIG field 3 and the EHT-SIG field 3 carried on the fragment 3, and the U-SIG field 3 includes the bandwidth field 3.
  • the channel bandwidth indicated by the bandwidth field 3 is 160 MHz. Therefore, the EHT-SIG field 3 includes 8 resource unit allocation subfields.
  • the EHT-SIG field 3 may include CC31 and CC32, and the transmission is performed on the 4 channels of the fragment 3 according to the structure of CC31, CC32, CC31, and CC32.
  • the CC31 on slice 3 includes the ninth 242-tone RU range of resource unit allocation subfield 9, the eleventh 242-tone RU range of resource unit allocation subfield 11, and the The thirteenth resource unit allocation subfield 13 within the 242-tone RU range, the fifteenth resource unit allocation subfield 15 within the 242-tone RU range, and the corresponding user-specific field.
  • the CC32 on Shard 3 includes the tenth 242-tone RU resource unit allocation subfield 10, the twelfth 242-tone RU resource unit allocation subfield 12, and the fourteenth 242-tone RU.
  • the PPDU also includes the U-SIG field 4 and the EHT-SIG field 4 carried on the fragment 4, and the U-SIG field 4 includes the bandwidth field 4.
  • the channel bandwidth indicated by the bandwidth field 4 is 80 MHz. Therefore, the EHT-SIG field 4 includes 4 resource unit allocation subfields.
  • the EHT-SIG field 4 may include CC41 and CC42. According to the structure of CC41, CC42, CC41, and CC42, transmission is carried out on the 4 channels of Fragment 4.
  • CC41 on slice 4 includes the resource unit allocation subfield 17 within the thirteenth 242-tone RU range, the resource unit allocation subfield 19 within the fifteenth 242-tone RU range, and The corresponding user-specific field.
  • the CC42 on Shard 4 includes the resource unit allocation subfield 18 within the fourteenth 242-tone RU, the resource unit allocation subfield 20 within the sixteenth 242-tone RU range, and the corresponding user-specific field .
  • each CC may not include the middle 26-tone RU indication field.
  • the resource unit allocation subfield 13 ⁇ resource unit allocation subfield 16 may be the same as or different from the resource unit allocation subfield 17 ⁇ resource unit allocation subfield 20.
  • the CCs sent on channel 1 to channel 4 and channel 9 to channel 16 only include two resource unit allocation subfields and corresponding user-specific fields.
  • the CCs sent on channel 5 to channel 8 only include 4 resource unit allocation subfields and corresponding user-specific fields.
  • the CC sent by 802.11ax on 16 channels includes 8 resource unit allocation subfields and corresponding user-specific fields. Therefore, by matching the bandwidth indicated by the bandwidth field with the number of resource unit allocation subfields included in the EHT-SIG field, it is beneficial to reduce the CC sent on the channel including the resource unit allocation subfield, and is beneficial to save overhead.
  • the U-SIG field further includes a compressed field.
  • the compressed field indicates a non-compressed mode
  • the EHT-SIG field includes (or exists) a resource unit allocation subfield.
  • the compressed field indicates the compressed mode
  • the EHT-SIG field does not include (or does not exist) the resource unit allocation subfield.
  • the U-SIG field may not include the compressed field, and the EHT-SIG field always includes the resource unit allocation subfield.
  • the compression field may include 1 bit.
  • the value of the compression field is 1, which indicates the compression mode.
  • the EHT-SIG field does not include the resource unit allocation subfield.
  • the value of the compressed field is 0, which indicates the uncompressed mode.
  • the EHT-SIG field includes a resource unit allocation subfield.
  • the value of the compressed field is 1, which indicates the uncompressed mode; the value of the compressed field is 0, which indicates the compressed mode.
  • the resources of the stops in the fragment are used for OFDMA transmission, and the compressed field indicates the uncompressed mode.
  • the resources of the stops in the fragment are used for non-OFDMA transmission, and the compression field indicates the compression mode.
  • whether to compress the EHT-SIG field can be determined at the granularity of fragmentation, which is more conducive to saving the signaling overhead of PPDU transmission.
  • the resources of the stops in the shard used for OFDMA transmission can include the following two situations:
  • Case 1 The channel bandwidth indicated by the bandwidth field is used for OFDMA transmission, and the resources of the stops in the slice are used for OFDMA transmission.
  • the channel bandwidth indicated by the bandwidth field 3 is used for OFDMA transmission (that is, the 160 MHz channel is allocated to stations 8, 9 and 10 for OFDMA transmission), and the stations in slice 3
  • the resource that is, the resource unit where the data part 4 and the data part 5 are
  • the U-SIG field 3 The compressed field in indicates the uncompressed mode.
  • Case 2 The channel bandwidth indicated by the bandwidth field is used for OFDMA transmission.
  • the channel bandwidth indicated by the bandwidth field 2 is used for OFDMA transmission (that is, 80 MHz channels are allocated to stations 6 and 7 for OFDMA transmission). Therefore, the compressed field in U-SIG field 2 may indicate the uncompressed mode.
  • the resources of the stops in the shard used for non-OFDMA transmission can include the following two situations:
  • Case 1 The channel bandwidth indicated by the bandwidth field is used for OFDMA transmission, but the resources of the stations that stop in the fragment are used for non-OFDMA transmission.
  • the channel bandwidth indicated by the bandwidth field 3 is used for OFDMA transmission (that is, the 160MHz channel is allocated to stations 8 and 9 for OFDMA transmission)
  • the resources That is, the resource unit where the data part 4 is located
  • the compression field in the U-SIG field 3 can indicate the compression mode .
  • Case 2 The channel bandwidth indicated by the bandwidth field is used for non-OFDMA transmission.
  • the channel bandwidth indicated by the bandwidth field 1 is used for non-OFDMA transmission, and therefore, the compression field in the U-SIG field 1 may indicate the compression mode.
  • the compressed field indicates the uncompressed mode.
  • the channel bandwidths indicated by the bandwidth field 2 to bandwidth field 4 are used for OFDMA transmission. Therefore, the compressed field in the U-SIG field 2 to U-SIG field 4 may indicate the uncompressed mode.
  • the channel bandwidth indicated by the bandwidth field is used for non-OFDMA transmission, but the channel bandwidth indicated by the bandwidth field is punctured, and the compressed field may indicate a non-compressed mode. Since there may be multiple discrete resource units after puncturing, the resource unit allocation subfield can be used to indicate the resource allocation status of the site. For example, in FIG. 18, although the channel bandwidth indicated by the bandwidth field 1 is used for non-OFDMA transmission, the channel bandwidth indicated by the bandwidth field 1 is punctured. Therefore, the compressed field in U-SIG field 1 may indicate the uncompressed mode.
  • the EHT-SIG field includes a preamble puncturing indication field, the preamble puncturing indication field is used to indicate that the channel bandwidth indicated by the bandwidth field is punctured, or the preamble puncturing indication field is used to indicate the PPDU The transmission bandwidth is punctured.
  • the name of the preamble puncturing indication field can also be replaced with a channel puncturing field or a puncturing field or other names.
  • the EHT-SIG field when the compression field indicates the compression mode, may include a preamble puncturing indication field.
  • the compression field indicates the compression mode please refer to the foregoing description, which will not be repeated here.
  • the U-SIG field may not include the compression field, and the EHT-SIG field always includes the preamble puncturing indication field.
  • the number of bits required for the preamble puncturing indication field is less than the number of bits required for the resource unit allocation subfield. Therefore, the preamble puncturing indication field is used to replace the resource unit allocation subfield to indicate the resource unit allocation of the station, which is beneficial to reduce PPDUs. Transmission signaling overhead.
  • the appearance position of the preamble puncturing indication field may be the same as the starting point of the resource unit allocation subfield.
  • the preamble puncturing indication field can indicate the puncturing situation by carrying an index.
  • the mapping relationship between the index and the punching mode can be defined in advance. For example, a mapping relationship between an index and a punching mode can be as shown in Table 3 below.
  • the index carried by the preamble puncturing indication field is 0, it indicates that the puncturing mode is X111.
  • the index carried by the preamble puncturing indication field is 1, it indicates that the puncturing mode is 1X11.
  • each bit in the puncture mode represents 20MHz.
  • X indicates the position of the punch.
  • the puncturing mode is X111, it means that the first 20MHz in 80MHz is punctured.
  • the RU size column in Table 3 indicates the size of the RU after punching. For example, "484+242" means 484-tone RU and 242-tone RU are merged. "-+996+996” means that two 996-tone RUs are merged. Among them, "-" means empty.
  • the RU size listed in Table 3 may or may not exist. It is worth mentioning that the mapping relationship shown in Table 3 may be applicable to the case where the transmission bandwidth of the PPDU is indicated to be punctured, and it may also be applicable to the case where the channel bandwidth indicated by the bandwidth field is indicated to be punctured.
  • Table 4 is another mapping relationship between an index and a punching mode provided in an embodiment of the present application.
  • the mapping relationship shown in Table 4 may be used to indicate that the channel bandwidth indicated by the bandwidth field is punctured. For example, if the channel bandwidth indicated by the bandwidth field is 80 MHz, the mapping relationship corresponding to 80 MHz in Table 4 can be used to indicate the channel bandwidth puncturing. If the channel bandwidth indicated by the bandwidth field is 160 MHz, the mapping relationship corresponding to 160 MHz in Table 4 can be used to indicate the channel bandwidth puncturing. If the channel bandwidth indicated by the bandwidth field is 240MHz, the mapping relationship corresponding to 240MHz in Table 4 can be used to indicate the channel bandwidth puncturing situation.
  • the mapping relationship corresponding to 320MHz in Table 4 can be used to indicate the channel bandwidth puncturing. It should be noted that Table 4 can also be split into four tables, and each table expresses a puncturing situation under a bandwidth.
  • the EHT-SIG field may include a resource unit allocation subfield.
  • the resource unit allocation subfield is used to implement the function of the preamble puncturing indication field, that is, it is used to indicate that the channel bandwidth indicated by the bandwidth field is punctured.
  • the resource unit allocation subfield is used to indicate the resource unit allocation of the site.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the preamble puncturing indicator field is also used to indicate the number of MU-MIMO users.
  • the PPDU indicates both the number of symbols in the EHT-SIG field and the number of users of MU-MIMO.
  • the mapping relationship between the index, the puncturing mode, and the number of MU-MIMO users can be predefined.
  • the index carried by the preamble puncturing indication field is 0, it indicates that the puncturing mode is X111 and the number of MU-MIMO users is 1.
  • the index carried by the preamble puncturing indication field is 1, it indicates that the puncturing mode is X111 and the number of MU-MIMO users is 2.
  • the preamble puncturing indication field carries other indexes, and will not be repeated here.
  • indexes 16-31 in Table 5 follow the order of index numbers from small to large, and the corresponding number of MU-MIMO users is 1, 2, 3, ..., 16.
  • indexes 32-47 follow the order of index numbers from small to large, and the corresponding number of MU-MIMO users is 1, 2, 3, ..., 16.
  • the numbers of users corresponding to indexes after 32-47 are similar, so we will Go into details.
  • the HE-SIG-A field in the uncompressed mode, is used to indicate the number of symbols in the HE-SIG-B field.
  • the HE-SIG-A field is used to indicate the number of MU-MIMO users.
  • the number of symbols in the HE-SIG-B field is calculated based on the number of MU-MIMO users.
  • the number of symbols in the EHT-SIG field on each fragment needs to be aligned. For example, the transmission bandwidth of the PPDU is divided into 4 fragments. The number of symbols in EHT-SIG field 1 on fragment 1 to EHT-SIG field 4 on fragment 4 must be the same.
  • the access point calculates the number of symbols in EHT-SIG field 1 to be 7 based on the number of MU-MIMO users of slice 1.
  • the access point calculates that the number of symbols in the EHT-SIG field 2 is 5 based on the number of MU-MIMO users of the fragment 2.
  • the access point calculates that the number of symbols in the EHT-SIG field 3 is 4 based on the number of MU-MIMO users of the slice 3.
  • the access point calculates that the number of symbols in the EHT-SIG field 4 is 4 based on the number of MU-MIMO users of the slice 4.
  • the access point when the access point generates the PPDU, in order to align the number of symbols in the EHT-SIG field 4 of EHT-SIG field 1 to slice 4, the number of symbols in the EHT-SIG field 2 to EHT-SIG field 4 needs to be filled. It is 7 symbols.
  • the site of fragment 2 receives EHT-SIG field 2, the number of symbols in EHT-SIG field 2 is calculated by the number of MU-MIMO users to be 5. In fact, the number of symbols in EHT-SIG field 2 is 7, but the site of Fragment 2 will mistake the number of symbols in EHT-SIG field 2 as 5.
  • the sites of Fragment 3 and Fragment 4 will also erroneously determine the number of symbols in their EHT-SIG field.
  • the station by carrying the number of symbols in the EHT-SIG field in the U-SIG field, the station can be directly informed of the number of symbols in the EHT-SIG field, so that the station can accurately determine the number of symbols in the EHT-SIG field. .
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the PPDU also includes the first field carried in the fragment, and the first field is used to indicate the number of MU-MIMO users.
  • the first field is different from the preamble puncturing indication field.
  • the number of MU-MIMO users can also be indicated by a field in the PPDU that is different from the preamble puncturing indication field.
  • the access point can directly inform the station of the number of symbols in the EHT-SIG field, so that the station can accurately determine the number of symbols in the EHT-SIG field.
  • the EHT-SIG field can be compressed at the granularity of fragmentation.
  • the following describes the relevant content of the EHT-SIG field compression using the entire transmission bandwidth of the PPDU as the granularity:
  • the compression field indicates the compression mode. That is, only when the entire transmission bandwidth of the PPDU is used for non-orthogonal frequency division multiple access OFDMA transmission, the compression field indicates the compression mode. This helps to save the signaling overhead of PPDU transmission. For example, as shown in Figure 28, the 320MHz transmission bandwidth of the PPDU as a whole is allocated to stations 1 to 5 for MU-MIMO transmission.
  • the compression fields in fragment 1 to fragment 4 all indicate the compression mode, and the EHT-SIG field 1 in fragment 1 to EHT-SIG field 4 in fragment 4 do not include the resource unit allocation subfield.
  • the EHT-SIG fields carried on multiple fragments included in the PPDU are the same.
  • EHT-SIG field 1 to EHT-SIG field 4 shown in FIG. 28 are the same.
  • stations 1 to 5 can also receive the EHT-SIG field on other fragments, which can increase the reliability of EHT-SIG field transmission.
  • the EHT-SIG field of the same fragment is the same on different channels of the fragment.
  • the contents of EHT-SIG field 1 on channel 13 to channel 16 are the same.
  • the content of EHT-SIG field 2 on channel 9 to channel 12 is the same.
  • the content of EHT-SIG field 3 on channel 5 to channel 8 is the same.
  • the content of EHT-SIG field 4 on channel 1 to channel 4 is the same. Based on this possible implementation, the reliability of EHT-SIG field transmission can be increased.
  • the compression field indicates the compression mode
  • the U-SIG field is also used to indicate the number of MU-MIMO users.
  • the number of MU-MIMO users indicated by the U-SIG field of each slice.
  • the compression field indicates the compression mode
  • the EHT-SIG field includes a preamble puncturing indication field
  • the preamble puncturing indication field is used to indicate that the transmission bandwidth of the PPDU is punctured.
  • the mapping relationship in Table 3 above can be used to indicate that the transmission bandwidth of the PPDU is punctured.
  • the preamble puncturing indication field is used to replace the resource unit allocation subfield to indicate the resource unit allocation status of the station, which is beneficial to reduce the signaling overhead of PPDU transmission.
  • FIG. 29 shows a schematic structural diagram of a communication device according to an embodiment of the present application.
  • the communication device shown in FIG. 29 may be used to perform part or all of the functions of the access point in the method embodiment described in FIG. 12.
  • the device can be an access point, or a device in the access point, or a device that can be used with the access point.
  • the communication device may also be a chip system.
  • the communication device shown in FIG. 29 may include a communication unit 2901 and a processing unit 2902.
  • the communication unit may also be referred to as a transceiving unit, or the communication unit includes a receiving unit and a sending unit.
  • the processing unit 2902 is used for data processing. in:
  • the processing unit 2902 is configured to generate a physical layer protocol data unit PPDU, wherein the transmission bandwidth of the PPDU is divided into multiple fragments, and the PPDU includes a general signaling U-SIG field carried on one fragment, and the U-SIG
  • the fields include a bandwidth field, which indicates the channel bandwidth where the resource unit allocated to the station stopped in the fragment is located; the communication unit 2901 is used to send PPDUs to the station.
  • the PPDU also includes the EHT-SIG field carried on a slice; the EHT-SIG field includes the resource unit allocation subfield, and the bandwidth indicated by the bandwidth field is the same as the resource unit allocation subfield included in the EHT-SIG field.
  • the number of fields corresponds to the number of fields, and the resource unit allocation subfield is used to indicate the resource units allocated for the stops in the segment.
  • the bandwidth indicated by the bandwidth field is 40 MHz in megahertz
  • the U-SIG field and the EHT-SIG field are transmitted on the 40 MHz bandwidth.
  • the correspondence between the bandwidth indicated by the bandwidth field and the number of resource unit allocation subfields included in the EHT-SIG field includes one or more of the following: if the bandwidth indicated by the bandwidth field is 20 Megahertz MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 1; if the bandwidth indicated by the bandwidth field is 40 MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 2; If the bandwidth indicated by the bandwidth field is 80MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 4; if the bandwidth indicated by the bandwidth field is 160MHz, then the resource unit allocation subfields included in the EHT-SIG field If the bandwidth indicated by the bandwidth field is 240MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 12; or, if the bandwidth indicated by the bandwidth field is 320MHz, then the EHT-SIG The number of resource unit allocation subfields included in the field is 16.
  • the EHT-SIG field includes a preamble puncturing indication field, and the preamble puncturing indication field is used to indicate that the channel bandwidth indicated by the bandwidth field is punctured.
  • the U-SIG field further includes a compression field.
  • the compression field indicates a compression mode
  • the EHT-SIG field includes the preamble puncturing indication field.
  • the compression field indicates the compression mode when the resources of the stops in the fragment are used for non-OFDMA transmission.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the preamble puncturing indication field is also used to indicate the number of users of the multi-user multiple input multiple output MU-MIMO.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the PPDU also includes the first field carried in the fragment.
  • the first field is used to indicate the multi-user multi-input multi-output MU- For the number of MIMO users, the first field is different from the preamble puncturing indication field.
  • the PPDU further includes an EHT-SIG field carried on a slice, and the U-SIG field also includes a compression field. If the transmission bandwidth of the PPDU is used for non-OFDMA transmission, the compression field indicates the compression mode.
  • the U-SIG field is also used to indicate the number of users of the multi-user multiple-input multiple-output MU-MIMO.
  • the EHT-SIG field includes a preamble puncturing indication field, and the preamble puncturing indication field is used to indicate that the transmission bandwidth of the PPDU is punctured.
  • the EHT-SIG fields carried on multiple fragments included in the PPDU are the same.
  • FIG. 29 shows a schematic structural diagram of a communication device according to an embodiment of the present application.
  • the communication device shown in FIG. 29 may be used to perform part or all of the functions of the station in the method embodiment described in FIG. 12.
  • the device can be a site, a device in the site, or a device that can be matched and used with the site.
  • the communication device may also be a chip system.
  • the communication device shown in FIG. 29 may include a communication unit 2901 and a processing unit 2902.
  • the communication unit may also be referred to as a transceiving unit, or the communication unit includes a receiving unit and a sending unit.
  • the processing unit 2902 is used for data processing. in:
  • the communication unit 2901 is configured to receive the physical layer protocol data unit PPDU sent by the access point.
  • the transmission bandwidth of the PPDU is divided into multiple fragments.
  • the PPDU includes a general signaling U-SIG field carried on one fragment.
  • -The SIG field includes a bandwidth field.
  • the bandwidth field indicates the channel bandwidth of the allocated resource unit for the stops in the fragment; the processing unit 2902 is configured to determine the channel bandwidth of the allocated resource unit according to the received U-SIG field.
  • the PPDU also includes the EHT-SIG field carried on a slice; the EHT-SIG field includes the resource unit allocation subfield, and the bandwidth indicated by the bandwidth field is the same as the resource unit allocation subfield included in the EHT-SIG field.
  • the number of fields corresponds to the number of fields, and the resource unit allocation subfield is used to indicate the resource units allocated for the stops in the segment.
  • the bandwidth indicated by the bandwidth field is 40 MHz in megahertz
  • the U-SIG field and the EHT-SIG field are transmitted on the 40 MHz bandwidth.
  • the correspondence between the bandwidth indicated by the bandwidth field and the number of resource unit allocation subfields included in the EHT-SIG field includes one or more of the following: if the bandwidth indicated by the bandwidth field is 20 Megahertz MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 1; if the bandwidth indicated by the bandwidth field is 40 MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 2; If the bandwidth indicated by the bandwidth field is 80MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 4; if the bandwidth indicated by the bandwidth field is 160MHz, then the resource unit allocation subfields included in the EHT-SIG field If the bandwidth indicated by the bandwidth field is 240MHz, the number of resource unit allocation subfields included in the EHT-SIG field is 12; or, if the bandwidth indicated by the bandwidth field is 320MHz, then the EHT-SIG The number of resource unit allocation subfields included in the field is 16.
  • the EHT-SIG field includes a preamble puncturing indication field, and the preamble puncturing indication field is used to indicate that the channel bandwidth indicated by the bandwidth field is punctured.
  • the U-SIG field further includes a compression field.
  • the compression field indicates a compression mode
  • the EHT-SIG field includes the preamble puncturing indication field.
  • the compression field indicates the compression mode when the resources of the stops in the fragment are used for non-OFDMA transmission.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the preamble puncturing indication field is also used to indicate the number of users of the multi-user multiple input multiple output MU-MIMO.
  • the U-SIG field is also used to indicate the number of symbols in the EHT-SIG field
  • the PPDU also includes the first field carried in the fragment.
  • the first field is used to indicate the multi-user multi-input multi-output MU- For the number of MIMO users, the first field is different from the preamble puncturing indication field.
  • the PPDU further includes an EHT-SIG field carried on a slice, and the U-SIG field also includes a compression field. If the transmission bandwidth of the PPDU is used for non-OFDMA transmission, the compression field indicates the compression mode.
  • the U-SIG field is also used to indicate the number of users of the multi-user multiple-input multiple-output MU-MIMO.
  • the EHT-SIG field includes a preamble puncturing indication field, and the preamble puncturing indication field is used to indicate that the transmission bandwidth of the PPDU is punctured.
  • the EHT-SIG fields carried on multiple fragments included in the PPDU are the same.
  • a communication device 300 provided by an embodiment of the application is used to implement the function of a station or an access point in the method embodiment described in FIG. 12; the device may be a station or an access point, or The device may be a device for a site or a device for an access point.
  • the device used in the site may be a chip system or a chip in the site.
  • the device used for the access point may be a chip system or a chip in the access point.
  • the chip system can be composed of chips, and can also include chips and other discrete devices.
  • the communication device 300 includes at least one processor 3020, configured to implement the data processing function of the station or the access point in the bandwidth indication method applied to the wireless local area network described above in this application.
  • the device 300 may further include a communication interface 3010, which is used to implement the receiving and sending operations of the station or the access point in the bandwidth indication method applied to the wireless local area network described above in this application.
  • the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, which is used to communicate with other devices through a transmission medium.
  • the communication interface 3010 is used for the device in the device 300 to communicate with other devices.
  • the processor 3020 uses the communication interface 3010 to send and receive data, and is used to implement the method described in the foregoing method embodiment.
  • the device 300 may also include at least one memory 3030 for storing program instructions and/or data.
  • the memory 3030 and the processor 3020 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 3020 may operate in cooperation with the memory 3030.
  • the processor 3020 may execute program instructions stored in the memory 3030. At least one of the at least one memory may be included in the processor.
  • the embodiment of the present application does not limit the specific connection medium between the aforementioned communication interface 3010, the processor 3020, and the memory 3030.
  • the memory 3030, the communication interface 3020, and the communication interface 3010 are connected by a bus 3040.
  • the bus is represented by a thick line in FIG. 30a.
  • the connection mode between other components is only for schematic illustration , Is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and so on. For ease of presentation, only one thick line is used to represent in FIG. 30a, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 3010 may output or receive a baseband signal.
  • the output or reception of the communication interface 3010 may be a radio frequency signal.
  • the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or Perform the methods, steps, and logic block diagrams disclosed in the embodiments of the present application.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • FIG. 30b is a schematic structural diagram of another site 3000 provided in an embodiment of this application.
  • the site can perform the operations performed by the site in Figure 12 above.
  • the site 3000 includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device.
  • the processor is mainly used to process communication protocols and communication data, control the entire site, execute software programs, and process data of the software programs, for example, to support the site to perform operations performed by the site in the process described in FIG. 12.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • the station 3000 may also include input and output devices, such as a touch screen, a display screen, a keyboard, etc., which are mainly used to receive data input by the user and output data to the user. It should be noted that some types of sites may not have input and output devices.
  • the processor can read the software program in the storage unit, interpret and execute the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 30b shows only one memory and a processor. In an actual site, there can be multiple processors and memories.
  • the memory may also be referred to as a storage medium or a storage device, etc., which is not limited in the embodiment of the present application.
  • the processor may include a baseband processor and a central processing unit (CPU).
  • the baseband processor is mainly used to process communication protocols and communication data, and the CPU is mainly used to process the entire site. Perform control, execute software programs, and process data in software programs.
  • the processor may also be a network processor (network processor, NP) or a combination of CPU and NP.
  • the processor may further include a hardware chip.
  • the above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • the above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.
  • the memory may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory) , A hard disk drive (HDD) or a solid-state drive (solid-state drive, SSD); the memory may also include a combination of the foregoing types of memory.
  • the antenna and radio frequency circuit with the transceiver function may be regarded as the communication unit 3001 of the station 3000, and the processor with the processing function may be regarded as the processing unit of the station 3000.
  • the antenna and radio frequency circuit with the transceiver function may be regarded as the communication unit 3001 of the station 3000, and the processor with the processing function may be regarded as the processing unit of the station 3000.
  • the communication unit 3001 may also be referred to as a transceiver, a transceiver, a transceiving device, a transceiving unit, etc., for implementing transceiving functions.
  • the device for implementing the receiving function in the communication unit 3001 can be regarded as the receiving unit, and the device for implementing the sending function in the communication unit 3001 as the sending unit, that is, the communication unit 3001 includes a receiving unit and a sending unit.
  • the receiving unit may also be called a receiver, a receiver, a receiving circuit, etc.
  • the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.
  • the communication unit 3001 and the processing unit 3002 may be integrated into one device or separated into different devices.
  • the processor and the memory may also be integrated into one device or separate into different devices.
  • the communication unit 3001 can be used to perform the receiving and sending operations of the station in the foregoing method embodiment.
  • the processing unit 3002 may be used to perform the data processing operation of the site in the foregoing method embodiment.
  • the embodiments of the present application also provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when they run on a processor, they are used to execute the method executed by the site in the foregoing method embodiment.
  • the embodiments of the present application also provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when running on a processor, they are used to execute the method executed by the access point in the foregoing method embodiment.
  • the embodiments of the present application also provide a computer program product, when the computer program product runs on a processor, it is used to execute the method executed by the site in the foregoing method embodiment.
  • the embodiment of the present application also provides a computer program product, when the computer program product runs on a processor, it is used to execute the method executed by the access point in the foregoing method embodiment.

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Abstract

一种应用于无线局域网的带宽指示方法及通信装置，可应用于支持802.11be的无线局域网中，该方法包括：接入点生成物理层协议数据单元PPDU，其中，PPDU的传输带宽被划分为多个分片，PPDU包括承载在一个分片上的通用信令U-SIG字段，U-SIG字段包括带宽字段，带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽；接入点向站点发送PPDU。该方法有利于减小PPDU传输的信令开销，并且可以为站点分配跨分片的资源，能够更加灵活地为站点分配资源。

Description

一种应用于无线局域网的带宽指示方法及通信装置
本申请要求于2020年04月30日提交中国专利局、申请号为202010366775.6、申请名称为“一种应用于无线局域网的带宽指示方法及通信装置”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
本发明涉及通信领域，尤其涉及一种应用于无线局域网的带宽指示方法及通信装置。
背景技术
WLAN发展至今已历经多代，包括802.11a/b/g、802.11n、802.11ac、802.11ax以及现在正在讨论中的802.11be(又称为Wi-Fi 7)等。其中，802.11n标准称为HT(High Throughput，高吞吐率)，802.11ac标准称为VHT(Very High Throughput，非常高吞吐率)，802.11ax标准称为HE(High Efficient，高效)，802.11be标准还称为EHT(Extremely High Throughput，超高吞吐率)。
在带宽配置方面，802.11ax目前支持如下带宽配置：20MHz、40MHz、80MHz、160MHz及80+80MHz。其中，160MHz与80+80MHz的区别在于前者为连续频带，而后者的两个80MHz间可以分离。在802.11be中，将对240MHz、320MHz等配置进行支持。
用户频带资源的分配并不是以20MHz的信道为单位，而是以资源单元(resource unit，RU)为单位。RU的形式可以是26-tone RU、52-tone RU、106-tone RU、242-tone RU、484-tone RU或996-tone RU等，tone表示子载波。例如，图1为80MHz的子载波分布及RU分布示意图。如图1所示，当带宽为80MHz时，整个带宽由4个242-tone RU为单位的资源单元组成，特别地，在整个带宽的中间，还存在一个由两个13-tone子单元组成的中间26-tone RU。或者，整个带宽可以由一整个996-tone RU组成，也可以由26-tone RU，52-tone RU，106-tone RU，242-tone RU，484-tone RU的各种组合组成。
目前802.11ax中已经提供了下行链路(downlink，DL)正交频分多址(orthogonal frequency division multiple access，OFDMA)及下行链路(downlink，DL)多用户(multiple user，MU)多输入多输出(multiple input multiple output，MIMO)的资源单元指示方法。在802.11ax中，发送端发送物理层协议数据单元(physical protocol data unit，PPDU)，该PPDU中包含高效信令-字段-A(high efficient-signal field-A)以及高效信令-字段-B(high efficient-signal field-B)。HE-SIG-A用于指示HE-SIG-B的符号长度，HE-SIG-B的调制编码策略(modulation and coding scheme，MCS)，整个PPDU的带宽等。若PPDU带宽大于20MHz，HE-SIG-A在每个20MHz上是进行复制传输的。PPDU中还包含HE-SIG-B，提供DL MU MIMO和DL OFDMA的资源指示信息。HE-SIG-B在每个20MHz上是单独编码的。在每一个20MHz上的HE-SIG-B的编码结构如图2所示。其中，整个HE-SIG-B被划分为两部分，分别为公共字段(common field)和用户特定字段(user specific field)。公共字段包含1～N个资源单元分配子字段(RU allocation subfield)，以及当带宽大于等于80MHz时存在的中间26-子载波(Center26-Tone)资源单元指示字段，然后是用于校验的循环冗余码(Cyclic Redundancy Code，CRC)以及用于循环解码的尾部(Tail)子字段。 在用户特定字段，按照资源单元分配的顺序，存在着1～M个用户字段(user field)。M个用户字段通常是两个为一组，每两个用户字段后跟着一个CRC和Tail字段，但应排除最后一组。在最后一组中，可能会存在1个或者2个用户字段。
在802.11ax中，引入了内容信道(content channel，CC)的概念。图3为当PPDU带宽为80MHz时HE-SIG-B字段的示意图。如图3所示，当PPDU带宽为80MHz时，HE-SIG-B字段存在2个CC，一共4个信道，整体按照频率由低到高按照CC1，CC2，CC1，CC2的结构在4个信道上对资源单元分配信息进行指示。在CC1中包含第一个和第三个242-tone RU范围内的资源单元分配子字段以及所对应的用户字段；CC2中包含第二个和第四个242-tone RU范围内的资源单元子字段以及所对应的用户字段。另外在两个CC上，都会携带80MHz的中间26-tone RU指示，指示该资源单元是否被用于传输数据。同理，当PPDU带宽为160MHz时，HE-SIG-B字段存在2个CC，一共8个信道，整体按照频率由低到高按照CC1，CC2，CC1，CC2，CC1，CC2，CC1，CC2的结构在8个信道上对资源单元分配信息进行指示。在CC1中包含第一个、第三个、第五个和第七个242-tone RU范围内的资源单元分配子字段以及所对应的用户字段；CC2中包含第二个、第四个、第六个和第八个242-tone RU范围内的资源单元子字段以及所对应的用户字段。
综上，现有技术实现了20MHz～160MHz情况下的资源单元指示，但其开销较大。在802.11be标准(Wi-Fi7)或之后的标准中(例如，Wi-Fi8)，PPDU的传输带宽可以为240MHz或320MHz或者更大，那么，PPDU中的资源单元指示的会成倍增加。因此，如何减少PPDU的PPDU传输的信令开销是目前亟待解决的问题。
发明内容
本发明实施例提供一种应用于无线局域网的带宽指示方法及通信装置，有利于减小PPDU传输的信令开销。
第一方面，本申请提供一种应用于无线局域网的带宽指示方法，该方法包括：接入点生成物理层协议数据单元PPDU，其中，该PPDU的传输带宽被划分为多个分片，该PPDU包括承载在一个分片上的通用信令U-SIG字段，U-SIG字段包括带宽字段，带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽；接入点向站点发送PPDU。
基于第一方面所描述的方法，通过将分片的带宽字段设置为用于指示该分片内的站点被分配的资源单元所在的信道带宽，从而该分片的EHT-SIG字段所包括的资源单元分配子字段的数量就可以与站点被分配的资源单元所在的信道带宽对应，能够在该分片上仅携带该带宽字段所指示的信道带宽对应的资源指示信息，这样有利于减小PPDU传输的信令开销。并且还可以为站点分配跨分片资源，相比于只能为站点分配自身所停靠的分片的资源单元，能够更加灵活地为站点分配资源。
在一种可能的实现中，PPDU还包括承载在一个分片上的EHT-SIG字段；EHT-SIG字段包括资源单元分配子字段，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量相对应，该资源单元分配子字段用于指示为分片内停靠的站点分配的资源单元。通过将分片的带宽字段所指示的带宽与该EHT-SIG字段包括的资源单元分配子字段的数量相对应，能够在该分片上仅携带该带宽字段所指示的信道带宽对应的资源指示信息，有利于减小PPDU传输的信令开销。并且还可以为站点分配跨分片资源，相比于只能为站点分配自身所停靠的分片的资源单元，能够更加灵活地为站点分配资源。
在一种可能的实现中，U-SIG字段还包括压缩字段，若该压缩字段指示非压缩模式，该EHT-SIG字段包括资源单元分配子字段。
在一种可能的实现中，若分片内停靠的站点的资源用于OFDMA传输，该压缩字段指示非压缩模式。可选的，分片内停靠的站点的资源用于OFDMA传输包括两种情况，情况1：带宽字段指示的信道带宽用于OFDMA传输。情况2：带宽字段指示的信道带宽用于OFDMA传输，且分片内停靠的站点的资源用于OFDMA传输。在该可选的方式中，可以以分片为粒度确定是否对EHT-SIG字段进行压缩，有利于减小PPDU传输的信令开销。
在一种可能的实现中，若带宽字段所指示的带宽为兆赫兹40MHz，则U-SIG字段和EHT-SIG字段在40MHz带宽上传输。相比于在整个分片上传输U-SIG字段和EHT-SIG字段，这样有利于减小PPDU传输的信令开销。
在一种可能的实现中，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系包括以下一种或多种：若带宽字段所指示的带宽为20兆赫兹MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为1个；若带宽字段所指示的带宽为40MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为2个；若带宽字段所指示的带宽为80MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为4个；若带宽字段所指示的带宽为160MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为8个；若带宽字段所指示的带宽为240MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为12个；或，若带宽字段所指示的带宽为320MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为16个。基于该可能的实现方式，能够有足够数量的资源单元分配子字段对带宽字段所指示的带宽中的资源进行指示。
在一种可能的实现中，EHT-SIG字段包括前导码打孔指示字段，该前导码打孔指示字段用于指示带宽字段指示的信道带宽被打孔的情况。前导码打孔指示字段所需要的比特数少于资源单元分配子字段所需要的比特数，因此通过前导码打孔指示字段来替代资源单元分配子字段，指示站点的资源单元分配情况，有利于减小PPDU传输的信令开销。
在一种可能的实现中，U-SIG字段还包括压缩字段，若该压缩字段指示压缩模式，该EHT-SIG字段包括前导码打孔指示字段。
在一种可能的实现中，若分片内停靠的站点的资源用于非OFDMA传输，该压缩字段指示压缩模式。在该可选的方式中，可以以分片为粒度对EHT-SIG字段进行压缩，有利于减小PPDU传输的信令开销。可选的，分片内停靠的站点的资源用于非OFDMA传输包括两种情况，情况1：带宽字段指示的信道带宽用于非OFDMA传输。情况2：带宽字段指示的信道带宽用于OFDMA传输，但分片内停靠的站点的资源用于非OFDMA传输。
在一种可能的实现中，在压缩模式下和非压缩模式下，EHT-SIG字段均可包括资源单元分配子字段。在压缩模式下，资源单元分配子字段用于实现上述前导码打孔指示字段的功能，即用于指示带宽字段指示的信道带宽被打孔的情况。在非压缩模式下，资源单元分配子字段用于指示站点的资源单元分配情况。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，该前导码打孔指示字段还用于指示MU-MIMO的用户数。通过实施该可能的实现方式，能够直接告知站点EHT-SIG字段的符号数，使站点能够准确地确定EHT-SIG字段的符号数。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，PPDU还包括承载在分片的第一字段，该第一字段用于指示多用户多输入多输出MU-MIMO的用户数， 第一字段与前导码打孔指示字段不相同。通过实施该可能的实现方式，能够直接告知站点EHT-SIG字段的符号数，使站点能够准确地确定EHT-SIG字段的符号数。
在一种可能的实现中，PPDU还包括承载在一个分片上的EHT-SIG字段，U-SIG字段还包括压缩字段，若PPDU的传输带宽用于非正交频分多址OFDMA传输，该压缩字段指示压缩模式，该压缩字段指示压缩模式时，该EHT-SIG字段不包括资源单元分配子字段。能够以PPDU的整个传输带宽为粒度对EHT-SIG字段进行压缩，有利于减小PPDU传输的信令开销。
在一种可能的实现中，若该压缩字段指示压缩模式，U-SIG字段还用于指示MU-MIMO的用户数。
在一种可能的实现中，若该压缩字段指示压缩模式，EHT-SIG字段包括前导码打孔指示字段，该前导码打孔指示字段用于指示PPDU的传输带宽被打孔的情况。在该可能的实现中，通过前导码打孔指示字段来替代资源单元分配子字段，指示站点的资源单元分配情况，有利于减小PPDU传输的信令开销。
在一种可能的实现中，PPDU包括的承载于多个分片上的EHT-SIG字段相同。基于该可能的实现方式，可以增加EHT-SIG字段传输的可靠性。
第二方面，本申请提供一种应用于无线局域网的带宽指示方法，该方法包括：站点接收接入点发送的物理层协议数据单元PPDU，其中，PPDU的传输带宽被划分为多个分片，PPDU包括承载在一个分片上的通用信令U-SIG字段，U-SIG字段包括带宽字段，带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽；站点根据接收的U-SIG字段确定被分配的资源单元所在的信道带宽。
第二方面的有益效果和可能的实现方式可参见第一方面中的描述，在此不赘述。
第三方面，提供了一种通信装置，该装置可以是接入点，也可以是接入点中的装置，或者是能够和接入点匹配使用的装置。其中，该通信装置还可以为芯片系统。该通信装置可执行第一方面所述的方法。该通信装置的功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该通信装置执行的操作及有益效果可以参见上述第一方面所述的方法以及有益效果，重复之处不再赘述。
第四方面，提供了一种通信装置，该装置可以是站点，也可以是站点中的装置，或者是能够和站点匹配使用的装置。其中，该通信装置还可以为芯片系统。该通信装置可执行第二方面所述的方法。该通信装置的功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的单元。该单元可以是软件和/或硬件。该通信装置执行的操作及有益效果可以参见上述第二方面所述的方法以及有益效果，重复之处不再赘述。
第五方面，本申请提供一种通信装置，所述通信装置包括至少一个处理器，当所述处理器调用存储器中的计算机程序时，如第一方面所述的方法中接入点执行的方法被执行。
第六方面，本申请提供一种通信装置，所述通信装置包括至少一个处理器，当所述处理器调用存储器中的计算机程序时，如第二方面所述的方法中站点执行的方法被执行。
第七方面，本申请提供一种通信装置，所述通信装置包括处理器和存储器，所述存储器用于存储计算机程序；所述处理器用于执行所述存储器所存储的计算机程序，以使所述通信装置执行第一方面所述的方法中接入点执行的方法。
第八方面，本申请提供一种通信装置，所述通信装置包括处理器和存储器，所述存储器用于存储计算机程序；所述处理器用于执行所述存储器所存储的计算机程序，以使所述通信装置执行如第二方面所述的方法中站点执行的方法。
第九方面，本申请提供一种通信装置，所述通信装置包括处理器、存储器和收发器，所述收发器，用于接收信号或者发送信号；所述存储器，用于存储计算机程序；所述处理器，用于从所述存储器调用所述计算机程序执行如第一方面所述的方法中接入点执行的方法。
第十方面，本申请提供一种通信装置，所述通信装置包括处理器、存储器和收发器，所述收发器，用于接收信号或者发送信号；所述存储器，用于存储计算机程序；所述处理器，用于从所述存储器调用所述计算机程序执行如第二方面所述的方法中站点执行的方法。
第十一方面，本申请提供一种通信装置，所述通信装置包括至少一个处理器和通信接口，所述通信接口，用于接收计算机程序并传输至所述处理器；所述处理器运行所述计算机程序以执行如第一方面所述的方法中接入点执行的方法。
第十二方面，本申请提供一种通信装置，所述通信装置包括至少一个处理器和通信接口，所述处理器运行计算机程序以执行如第二方面所述的方法中站点执行的方法。
第十三方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质用于存储指令，当所述指令被执行时，使得如第一方面所述的方法中接入点执行的方法被实现。
第十四方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质用于存储指令，当所述指令被执行时，使得如第二方面中站点执行的方法被实现。
第十五方面，本申请提供一种包括指令的计算机程序产品，当所述指令被执行时，使得如第一方面所述的方法中接入点执行的方法被实现。
第十六方面，本申请提供一种包括指令的计算机程序产品，当所述指令被执行时，使得如第二方面中站点执行的方法被实现。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例提供的一种80MHz的子载波分布及RU分布示意图；
图2是本申请实施例提供的一种20MHz上的HE-SIG-B的编码结构；
图3是本申请实施例提供的一种当PPDU带宽为80MHz时HE-SIG-B字段的示意图；
图4是本申请实施例提供的一种20MHz的子载波分布及RU分布示意图；
图5是本申请实施例提供的一种40MHz的子载波分布及RU分布示意图；
图6是本申请实施例提供的一种HE MU PPDU的帧结构示意图；
图7是本申请实施例提供的一种当HE MU PPDU的带宽为20MHz时HE-SIG-B字段的示意图；
图8是本申请实施例提供的一种当HE MU PPDU的带宽为40MHz时HE-SIG-B字段的示意图；
图9是本申请实施例提供的一种当HE MU PPDU的带宽为160MHz时HE-SIG-B字段 的示意图；
图10是本申请实施例提供的一种EHT MU PPDU的帧结构示意图；
图11是本申请实施例提供的一种系统架构的示意图；
图12是本申请实施例提供的一种应用于无线局域网的带宽指示方法的流程示意图；
图13是本申请实施例提供的一种分片的示意图；
图14为本申请实施例提供的一种分片1内停靠的站点的信道和信道带宽的分配情况的示意图；
图15为本申请实施例提供的一种分片2内停靠的站点的信道和信道带宽的分配情况的示意图；
图16为本申请实施例提供的一种分片3内停靠的站点的信道和信道带宽的分配情况的示意图；
图17为本申请实施例提供的一种分片4内停靠的站点的信道和信道带宽的分配情况的示意图；
图18为本申请实施例提供的一种PPDU的帧结构的示意图；
图19为本申请实施例提供的另一种PPDU的帧结构的示意图；
图20为本申请实施例提供的另一种PPDU的帧结构的示意图；
图21为本申请实施例提供的一种EHT-SIG字段1的示意图；
图22为本申请实施例提供的一种EHT-SIG字段2的示意图；
图23为本申请实施例提供的一种EHT-SIG字段3的示意图；
图24为本申请实施例提供的一种EHT-SIG字段4的示意图；
图25为本申请实施例提供的另一种PPDU的帧结构的示意图；
图26为本申请实施例提供的另一种PPDU的帧结构的示意图；
图27为本申请实施例提供的另一种PPDU的帧结构的示意图；
图28为本申请实施例提供的另一种PPDU的帧结构示意图；
图29是本申请实施例提供的一种通信装置的结构示意图；
图30a是本申请实施例提供的另一种通信装置的结构示意图；
图30b是本申请实施例提供的又一种通信装置的结构示意图。
具体实施方式
本发明的说明书和权利要求书及所述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本发明的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在 三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
为便于理解本申请实施例的相关内容，下面对一些背景知识进行介绍。
1、WLAN带宽配置
WLAN发展至今已历经多代，包括802.11a/b/g、802.11n、802.11ac、802.11ax以及现在正在讨论中的802.11be等。其中，802.11n标准称为HT(High Throughput，高吞吐率)，802.11ac标准称为VHT(Very High Throughput，非常高吞吐率)，802.11ax标准称为HE(High Efficient，高效)，802.11be标准称为EHT(Extremely High Throughput，超高吞吐率)。以上各个WLAN标准的PPDU可支持的带宽配置如下表1所示：
表1
Figure PCTCN2021078870-appb-000001
2、资源单元(resource unit，RU)
用户频带资源的分配并不是以20MHz的信道为单位，而是以资源单元(resource unit，RU)为单位。RU的形式可以是26-tone RU、52-tone RU、106-tone RU、242-tone RU、484-tone RU或996-tone RU等，tone表示子载波。
例如，图4为本申请实施例提供的一种20MHz的子载波分布及RU分布示意图。如图4所示，当带宽为20MHz时，整个带宽可以由一整个242-tone RU组成，也可以由26-tone RU，52-toneRU，106-tone RU的各种组合组成。带宽除了包括用于传输数据的RU外，还包括一些保护(Guard)子载波，空子载波(图中1所在的子载波为空子载波，其中1表示空子载波的个数为1)，或者直流(Direct Current，DC)子载波。
再如，图5为本申请实施例提供的一种40MHz的子载波分布及RU分布示意图。如图5所示，当带宽为40MHz时，整个带宽大致相当于20MHz的子载波分布的复制，整个带宽可以由一整个484-tone RU组成，也可以由26-tone RU，52-tone RU，106-tone RU，242-tone RU的各种组合组成。
再如，图1为本申请实施例提供的一种80MHz的子载波分布及RU分布示意图。如图1所示，当带宽为80MHz时，整个带宽由4个242-tone RU为单位的资源单元组成，特别的，在整个带宽的中间，还存在一个由两个13-tone子单元组成的中间26-tone RU。整个带宽可以由一整个996-tone RU组成，也可以由26-tone RU，52-tone RU，106-tone RU，242-tone RU，484-tone RU的各种组合组成。
当带宽为160MHz或者80+80MHz时，整个带宽可以看成两个80Mhz的子载波分布的复制，整个带宽可以由一整个2*996-tone RU组成，也可以由26-tone RU，52-tone RU，106-tone RU，242-tone RU，484-tone RU，996-tone RU的各种组合组成。
3、正交频分多址(orthogonal frequency division multiple access，OFDMA)传输和非OFDMA传输
OFDMA传输是一种多用户通信机制，其适用于802.11ax标准以及之后的接入点(access point，AP)和非接入点类的站点(none access point station，non-AP STA)之间的数据帧交换，整个传输带宽可划分为多个RU，分别分配给不同的用户。非OFDMA传输中，整个传输带宽作为一个整体被用于单用户(single user，SU)或者多用户多输入多输出(multiple user multiple input multiple output，MU-MIMO)传输。对于非OFDMA传输，在进行前导码打孔以后，剩下的没被打孔的部分会形成多个RU，多个RU被合并作为一个整体。非OFDMA传输支持的多RU合并组合情况，等效于非OFDMA传输支持的前导码打孔组合情况。
4、高效多用户物理层协议数据单元(high efficient multiple user physical layer protocol data unit，HE MU PPDU)
HE MU PPDU主要用于802.11ax中的DLOFDMA和DL MU-MIMO传输。图6为HE MU PPDU的结构示意图。如图6所示，HE MU PPDU被分为前导码和数据字段部分，其中，前导码部分包含高效信令-字段-A(high efficient-signal field-A，HE-SIG-A)以及高效信令-字段-B(high efficient-signal field-B，HE-SIG-A)两部分HE信令字段。其中，对HE-SIG-A和HE-SIG-B的相关描述可参见背景技术中的描述。
其中，HE-SIG-B中的资源单元分配子字段为8个比特，通过索引的方式指示出242-tone RU内所有可能的资源单元排列组合方式。此外，对于尺寸大于等于106-tone的RU，通过索引，同时指示该RU中进行SU/MU-MIMO传输的用户数(即STA数量)。资源单元分配子字段的索引如表2所示：
表2
Figure PCTCN2021078870-appb-000002
Figure PCTCN2021078870-appb-000003
如表2所示，第一列代表资源单元分配子字段的8比特索引，中间列#1～#9代表着不同资源单元的排列组合。表2中的每一行代表一种RU分配情况。举例来讲，索引00111y2y1y0表示分配了52-tone RU，52-tone RU，26-tone RU，106-tone RU共4个RU。另外，表2中的数目用于指示106-tone RU内所包含的用户数。例如：00010y 2y 1y 0对应的数目为8，是因为在指示资源单元分配的同时，y 2y 1y 0还用于指示在该106-tone RU内所包含的用户数，对应1～8个用户(即站点)。其中，y 2y 1y 0的每一个值都可以为0或者1。
应注意到，用户特定字段中用户出现的顺序与对应的资源单元分配子字段中划分出的RU顺序相一致，用户可以通过读取用户字段中的站点标识来识别自身该用户字段是否属 于自己，结合用户字段出现的位置与对应的资源单元分配子字段，用户可以知晓自己的RU分配情况。
表2中大部分的RU分配是在242-tone的范围内，另外有少部分索引指示的RU为242-tone RU、484-tone RU、996-tone RU。
5、内容信道(content channel，CC)
以242-tone RU为单位，图1、图4或图5的左边可以看做最低频率，图的右边可以看做最高频率。从左到右，可以对242-tone RU进行标号：1#,2#,…,8#。
802.11ax引入了内容信道的概念。例如，如图7所示，当HE MU PPDU的带宽只有20MHz时，HE-SIG-B字段只包含1个内容信道CC1，该CC1中包含1个资源单元分配子字段，用于指示数据部分242-toneRU范围内的资源单元分配指示。
再如，如图8所示，当HE MU PPDU带宽为40MHz时，HE-SIG-B字段包括两个内容信道，分别为CC1和CC2。CC1中包含第一个242-tone RU范围内的资源单元分配子字段以及所对应的用户字段；CC2中包含第二个242-tone RU范围内的资源单元分配子字段以及所对应的用户字段。
再如，如图3所示，当HE MU PPDU带宽为80MHz时，HE-SIG-B字段仍然包括2个CC，一共4个信道，因此整体按照频率由低到高按照CC1，CC2，CC1，CC2的结构在4个信道上对资源单元分配信息进行指示。其中，在CC1中包含第一个和第三个242-tone RU范围内的资源单元分配子字段以及其范围内所对应的用户字段；CC2中包含第二个和第四个242-tone RU范围内的资源单元子字段以及其范围内所对应的用户字段。另外在两个CC上，都会携带80MHz的中间26-tone RU指示，指示该资源单元是否被用于传输数据。
再如，如图9所示，当HE MU PPDU带宽为160MHz时，HE-SIG-B字段仍然包括2个CC，一共8个信道，因此整体按照频率由低到高按照CC1，CC2，CC1，CC2，CC1，CC2，CC1，CC2的结构在8个信道上对资源单元分配信息进行指示。其中，在CC1中包含第一个、第三个、第五个和第七个242-tone RU范围内的资源单元分配子字段以及其范围内所对应的用户字段；CC2中包含第二个、第四个、第六个和第八个242-tone RU范围内的资源单元子字段以及其范围内所对应的用户字段。另外在两个CC上，都会携带80MHz的中间26-tone RU指示，指示该资源单元是否被用于传输数据。
6、极高吞吐量多用户物理层协议数据单元(extremely high throughput multiple userphysical layer protocol data unit，EHT MU PPDU)
在802.11be中引入了EHT MU PPDU。EHT MU PPDU主要用于802.11be中的DLOFDMA和DL MU-MIMO传输。如图10所示，目前提出的EHT MU PPDU的帧结构主要包括传统短训练序列(legacy short training,L-STF)字段、传统长训练序列(legacy long training,L-LTF)字段、传统信令(legacy signal,L-SIG)字段、重复的传统信令(repeated legacy signal,RL-SIG)字段、通用信令(universal signal,U-SIG)字段、极高吞吐率信令(extremely high throughput-signal,EHT-SIG)字段、EHT短训练(EHT-STF)字段、EHT长训练(EHT-LTF)字段和数据字段。EHT-SIG字段中可包括两部分，第一部分公共字段(common field)包含1～N个资源单元分配子字段(resource unit allocation subfield)；第二部分用户特定字段(user specific field)，按照资源单元分配的顺序，存在着1～M个用户字段(user field)。
如上所述，802.11ax实现了20M～160MHz情况下的资源单元指示，但其开销较大，例如，如图9所示，当HE MU PPDU的传输带宽为160MHz时，每个CC上包含了4个资源单元分配子指示字段，并且包含了4个242-tone RU内部所有的用户字段，PPDU传输的信令开销较大。而在802.11be标准或之后的标准中，EHT MU PPDU的传输带宽更大时，信令开销会进一步增加。为了减小PPDU传输的信令开销，本申请实施例提供了一种应用于无线局域网的带宽指示方法及通信装置。
为了便于理解本申请实施例所描述的方案，下面先对本申请实施例的系统架构进行描述：
需要说明的是，本申请实施例的技术方案，可以应用于采用802.11be或802.11be之后的标准的无线局域网WLAN中，还可以应用于其他支持大带宽OFDM传输的通信系统中。
图11为本申请实施例提供的系统架构的示意图，如图11所示，该系统架构中可以包括接入点(access point，AP)类的站点和非接入点类的站点(none access point station，non-AP STA)。为便于描述，本文将接入点类型的站点称为接入点(AP)，非接入点类的站点称为站点(STA)。系统架构中可包括一个或多个接入点，以及包括一个或多个站点。图11以包括一个接入点，以及3个站点为例。
其中，接入点可以为终端设备(如手机)进入有线(或无线)网络的接入点，主要部署于家庭、大楼内部以及园区内部，典型覆盖半径为几十米至上百米，当然，也可以部署于户外。接入点相当于一个连接有线网和无线网的桥梁，主要作用是将各个无线网络客户端连接到一起，然后将无线网络接入以太网。具体的，接入点可以是带有无线保真(wreless-fidelity，WiFi)芯片的终端设备(如手机)或者网络设备(如路由器)。接入点可以为支持802.11be制式的设备。接入点也可以为支持802.11be、802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等802.11家族的多种无线局域网(wireless local area networks，WLAN)制式的设备。本申请中的接入点可以是高效(high efficient,HE)AP或极高吞吐量(extramelyhigh throughput,EHT)AP，还可以是适用未来某代WiFi标准的接入点。
站点可以为无线通讯芯片、无线传感器或无线通信终端等，也可称为用户。例如，站点可以为支持WiFi通讯功能的移动电话、支持WiFi通讯功能的平板电脑、支持WiFi通讯功能的机顶盒、支持WiFi通讯功能的智能电视、支持WiFi通讯功能的智能可穿戴设备、支持WiFi通讯功能的车载通信设备和支持WiFi通讯功能的计算机等等。可选地，站点可以支持802.11be制式。站点也可以支持802.11be、802.11ax、802.11ac、802.11n、802.11g、802.11b及802.11a等802.11家族的多种无线局域网(wireless local area networks，WLAN)制式。
例如，接入点和站点可以是应用于车联网中的设备，物联网(IoT，internet of things)中的物联网节点、传感器等，智慧家居中的智能摄像头，智能遥控器，智能水表电表，以及智慧城市中的传感器等。
本申请技术方案可以适用于接入点与一个或多个站点之间的数据通信，也同样适用于接入点于多个接入点之间的通信，还适用于站点与多个站点之间的通信。下面以接入点与多个站点之间的数据通信为例对本申请技术方案进行说明。
请参见图12，图12是本申请实施例提供的一种应用于无线局域网的带宽指示方法的流程示意图。如图12所示，该应用于无线局域网的带宽指示方法包括如下步骤1201～步骤 1203，图12所示的方法执行主体可以为接入点和站点。或者，图12所示的方法执行主体可以为接入点中的芯片和站点中的芯片。图12以接入点和站点为执行主体为例进行说明。
1201、接入点生成PPDU，其中，该PPDU的传输带宽被划分为多个分片，该PPDU包括承载在一个分片上的U-SIG字段，该U-SIG字段包括带宽字段，该带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽。
本申请实施例中，PPDU可以为EHT MU PPDU，或者该PPDU可以为802.11的其他标准中的PPDU，本申请实施例不做限定。该PPDU的传输带宽可以为20MHz，40MHz，80MHz，160MHz/80+80MHz，240MHz或320MHz等。
本申请实施例全文中的各个字段的名称也可以是其他名称，例如在802.11be中可以称为U-SIG字段和带宽字段，但在802.11be之后的标准中也可以称为其他字段名称。本文所述的“字段(field)”也可称为“域”、“信息”等，“子字段(subfield)”可称为“子域”、“信息”等。
下面先对分片以及站点被分配的资源单元所在的信道带宽这两个概念进行介绍：
1、分片
本申请实施例中，PPDU的传输带宽被划分为多个分片。一个分片可以为80MHz。或者，一个分片也可以为20MHz或40MHz或160MHz等。该多个分片中的部分分片或全部分片内停靠有一个或多个站点。
举例来说，以PPDU的传输带宽为320MHz，一个分片为80MHz为例。如图13所示，320MHz包括16个信道，一个信道相当于20MHz。PPDU的传输带宽被划分为分片1～分片4，每个分片为80MHz。分片1中停靠有站点1～站点5，分片2中停靠有站点6和站点7，分片3中停靠有站点8，分片4中停靠有站点9。
可选的，不同分片的带宽大小也可以不相同。例如，PPDU的320MHz传输带宽被划分为分片1～分片3，分片1为80MHz，分片2为80MHz，分片3为160MHz。
2、站点被分配的资源单元所在的信道带宽
针对不同分片内停靠的站点，可以预先定义各分片内停靠的站点的信道和信道带宽。
举例来说，图14为分片1内停靠的站点的信道和信道带宽的分配情况。如图14所示，预先定义的分片1内停靠的站点的信道包括：主20MHz信道(或简称主信道，Primary20MHz，P20)，从20MHz信道(Secondary 20MHz,S20)，从40MHz信道(Secondary 40MHz,S40)，从80MHz(Secondary 80MHz,S80)信道和从160MHz(Secondary 160MHz,S40)信道。信道13对应主20MHz信道。信道14对应从20MHz信道。信道15和信道16合并为从40MHz信道。信道9至信道12合并为从80MHz信道。信道1至信道8合并为从160MHz信道。
预先定义的分片1内停靠的站点的信道带宽可以包括20MHz、40MHz、80MHz、160MHz、240MHz和320MHz中的一种或多种。如果PPDU的传输带宽大于320MHz，预先定义的信道带宽还可以大于320MHz。图14以预先定义的分片1内停靠的站点的信道带宽包括80MHz、160MHz、240MHz和320MHz为例。如图14所示，如果分片1内停靠的站点被分配的资源单元在分片1中，且未在分片2～分片4中，则分片1内停靠的站点被分配的资源单元所在的信道带宽为80MHz。如果分片1内停靠的站点被分配的资源单元在分片2中，且未在分片3和分片4中，则分片1内停靠的站点被分配的资源单元所在的信道带宽为160MHz。如果分片1内停靠的站点被分配的资源单元在分片3中，且未在分片4 中，则分片1内停靠的站点被分配的资源单元所在的信道带宽为240MHz。如果分片1内停靠的站点被分配的资源单元在分片4中，则分片1内停靠的站点被分配的资源单元所在的信道带宽为320MHz。
分片2内停靠的站点的信道和信道带宽的分配情况如图15所示。分片3内停靠的站点的信道和信道带宽的分配情况如图16所示，分片4内停靠的站点的信道和信道带宽的分配情况如图17所示。确定分片2或分片3或分片4内停靠的站点被分配的资源单元所在的信道带宽的原理与分片1相同，在此不赘述。
本申请实施例中，PPDU还包括分片内停靠的站点的数据部分。该站点被分配的资源单元用于承载该站点接收的数据部分，站点可以在被分配的资源单元上接收自身的数据。因此，带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽也可以等价于：带宽字段指示分片内停靠的站点的数据部分所在的信道带宽。
下面以一个具体的示例对本申请实施例的PPDU的帧结构进行描述：
举例来说，如图18所示，PPDU的传输带宽为320MHz，PPDU的传输带宽被划分为4个分片，每个分片的大小为80MHz，每个分片中包括4个信道。预先为分片1～分片4定义的信道带宽如图14～图17所示。
PPDU包括承载在分片1上的U-SIG字段1，该U-SIG字段1包括带宽字段1。PPDU还可包括承载在分片1上的EHT-SIG字段1，用于指示分片1内停靠的站点被分配的资源单元。PPDU中还包括用于发送给站点1～站点5的数据部分1。数据部分1所在的信道带宽为80MHz(即站点1～站点5被分配的资源单元所在的信道带宽为80MHz)。因此，带宽字段1指示的信道带宽为80MHz。
PPDU还包括承载在分片2上的U-SIG字段2，该U-SIG字段2包括带宽字段2。PPDU还可包括承载在分片2上的EHT-SIG字段2，用于指示分片2内停靠的站点被分配的资源单元。PPDU中还包括用于发送给站点6的数据部分2，以及用于发送给站点7的数据部分3。该数据部分2和数据部分3所在的信道带宽为80MHz(即站点6和站点7被分配的资源单元所在的信道带宽为80MHz)。因此，带宽字段2指示的信道带宽为80MHz。
PPDU还包括承载在分片3上的U-SIG字段3，该U-SIG字段3包括带宽字段3。PPDU还可包括承载在分片3上的EHT-SIG字段3，用于指示分片3内停靠的站点被分配的资源单元。PPDU中还包括用于发送给站点8的数据部分4。该数据部分4在分片3和分片4中都存在，因此，该数据部分4所在的信道带宽为160MHz(即站点8被分配的资源单元所在的信道带宽为160MHz)。因此，带宽字段3指示的信道带宽为160MHz。
PPDU还包括承载在分片4上的U-SIG字段4，该U-SIG字段4包括带宽字段4。PPDU还可包括承载在分片4上的EHT-SIG字段4，用于指示分片4内停靠的站点被分配的资源单元。PPDU中还包括用于发送给站点9的数据部分5。该数据部分5所在的信道带宽为80MHz(即站点9被分配的资源单元所在的信道带宽为80MHz)。因此，带宽字段4指示的信道带宽为80MHz。
在一种可能的实现中，在PPDU中也可以只包括部分分片上的U-SIG字段和EHT-SIG字段。
例如，如果分片4内停靠的站点9未被分配资源单元，那么PPDU也可以不包括承载在分片4上的U-SIG字段4和EHT-SIG字段4，即接入点不需要在分片4发送U-SIG字段4和EHT-SIG字段4，这样有利于节省PPDU传输的信令开销。当然，PPDU中也可以包 括全部分片上的U-SIG字段和EHT-SIG字段。
在一种可能的实现中，在以下3种情况下，U-SIG字段和EHT-SIG字段可在分片的部分信道上传输。
情况1：如果分片的带宽字段指示的信道带宽为大于或等于该分片的大小，但该分片的信道被打孔，则承载于该分片的U-SIG字段和EHT-SIG字段在该部分信道上传输。
例如，如图19所示，虽然带宽字段1指示80MHz，但站点1～站点5被分配的资源单元在分片1的信道15和信道16上，即带宽字段1指示的信道带宽有40MHz被打孔。因此，U-SIG字段1可以只在分片1的信道15和信道16上传输。同理，虽然带宽字段4指示80MHz，但站点9被分配的资源单元在分片4的信道3和信道4上，相当于带宽字段4指示的信道带宽有40MHz被打孔。因此，U-SIG字段4可以只在分片4的信道3～信道4上传输。当然，如图18所示，在带宽字段1指示的信道带宽被打孔时，也可以在分片1的所有信道上发送U-SIG字段1和EHT-SIG字段1。在带宽字段4指示的信道带宽被打孔时，也可以在分片4的所有信道上发送U-SIG字段4和EHT-SIG字段4。这样可以增加U-SIG字段和EHT-SIG字段传输的可靠性。
情况2：如果分片的带宽字段指示的信道带宽为40MHz，则承载于该分片的U-SIG字段和EHT-SIG字段在该40MHz上传输。
例如，如图20所示，带宽字段1指示的信道带宽为40MHz。因此，U-SIG字段1和EHT-SIG字段1可以只在分片1的信道13和信道14上传输。同理，带宽字段4指示的信道带宽为40MHz。因此，U-SIG字段4和EHT-SIG字段4可以只在分片4的信道1～信道2上传输。当然，U-SIG字段1和EHT-SIG字段1也可以在分片1的所有信道上进行传输，U-SIG字段4和EHT-SIG字段4也可以在分片4的所有信道上进行传输，这样可以增加U-SIG字段和EHT-SIG字段传输的可靠性。
情况3：如果分片的带宽字段指示的信道带宽为20MHz，则承载于该分片的U-SIG字段和EHT-SIG字段在该20MHz上传输。情况3的实现原理与分片的带宽字段指示的信道带宽为40MHz时相同，在此不赘述。
1202、接入点向站点发送PPDU。
本申请实施例中，接入点生成PPDU之后，向站点发送PPDU。
1203、站点根据接收的U-SIG字段确定被分配的资源单元所在的信道带宽。
本申请实施例中，站点会在其停靠的分片上接收PPDU，站点接收U-SIG字段之后，根据该U-SIG字段确定被分配的资源单元所在的信道带宽。然后站点就可在该信道带宽中确定分配给该站点的资源单元，并在该资源单元上接收PPDU中用于发送给该站点的数据部分。
例如，在图18中，站点1～站点5在分片1上接收U-SIG字段1，并根据U-SIG字段1确定其被分配的资源单元所在的信道带宽为80MHz。站点1～站点5基于EHT-SIG字段1在该80MHz中确定分配给站点1～站点5的资源单元之后，在该资源单元上接收PPDU中的数据部分1。其他分片中的站点同理，在此不赘述。
在802.11ax中，各个信道传输的HE-SIG-A字段的带宽字段用于指示PPDU的全部传输带宽。例如，如果PPDU的全部传输带宽为320MHz。PPDU中的HE-SIG-B字段包括CC1和CC2，CC1和CC2分别包括8个资源单元分配子字段，CC1和CC2分别在8个信道上发送，即每个信道上都会发送8个资源单元分配子字段，这样PPDU传输的信令开销 非常大。通过实施图12所描述的方法，可以对PPDU的全部传输带宽进行分片，并且可以将分片的带宽字段设置为用于指示该分片内的站点被分配的资源单元所在的信道带宽。从而该分片的EHT-SIG字段所包括的资源单元分配子字段的数量就可以与站点被分配的资源单元所在的信道带宽对应，能够在该分片上仅携带该带宽字段所指示的信道带宽对应的资源指示信息，这样有利于减小PPDU传输的信令开销。并且还可以为站点分配跨分片资源，相比于只能为站点分配自身所停靠的分片的资源单元，能够更加灵活地为站点分配资源。
下面分别对EHT-SIG字段的可能的实现方式进行介绍：
(一)EHT-SIG字段包括(或存在)资源单元分配子字段，带宽字段所指示的带宽与该EHT-SIG字段包括的资源单元分配子字段的数量相对应。通过将分片的带宽字段所指示的带宽与该EHT-SIG字段包括的资源单元分配子字段的数量相对应，能够在该分片上仅携带该带宽字段所指示的信道带宽对应的资源指示信息，有利于减小PPDU传输的信令开销。并且还可以为站点分配跨分片资源，相比于只能为站点分配自身所停靠的分片的资源单元，能够更加灵活地为站点分配资源。
可选的，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系包括以下一种或多种：若带宽字段所指示的带宽为20兆赫兹MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为1个；若带宽字段所指示的带宽为40MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为2个；若带宽字段所指示的带宽为80MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为4个；若带宽字段所指示的带宽为160MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为8个；若带宽字段所指示的带宽为240MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为12个；或，若带宽字段所指示的带宽为320MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为16个。
下面通过具体的示例对带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系进行介绍：
举例来说，如图18所示，PPDU包括承载在分片1上的U-SIG字段1和EHT-SIG字段1，该U-SIG字段1包括带宽字段1。带宽字段1指示的信道带宽为80MHz。由于每20MHz带宽对应一个资源单元分配子字段。因此，EHT-SIG字段1中包括4个资源单元分配子字段。如图18所示，EHT-SIG字段1可包括CC11和CC12。按照CC11，CC12，CC11，CC12的结构在分片1的4个信道上进行传输。如图21所示，在分片1上的CC11包括第一个242-tone RU范围内的资源单元分配子字段1、第三个242-tone RU范围内的资源单元分配子字段3以及所对应的用户特定字段。在分片1上的CC12包括第二个242-tone RU范围内的资源单元分配子字段2、第四个242-tone RU范围内的资源单元分配子字段4以及所对应的用户特定字段。
PPDU还包括承载在分片2上的U-SIG字段2和EHT-SIG字段2，该U-SIG字段2包括带宽字段2。带宽字段2指示的信道带宽为80MHz。因此，EHT-SIG字段2中包括4个资源单元分配子字段。如图18所示，EHT-SIG字段2可包括CC21和CC22。按照CC21，CC22，CC21，CC22的结构在分片2的4个信道上进行传输。如图22所示，在分片2上的CC21包括第五个242-tone RU范围内的资源单元分配子字段5、第七个242-tone RU范围内的资源单元分配子字段7以及所对应的用户特定字段。在分片2上的CC22包括第六 个242-tone RU范围内的资源单元分配子字段6、第八个242-tone RU范围内的资源单元分配子字段8以及所对应的用户特定字段。
PPDU还包括承载在分片3上的U-SIG字段3和EHT-SIG字段3，该U-SIG字段3包括带宽字段3。带宽字段3指示的信道带宽为160MHz。因此，EHT-SIG字段3中包括8个资源单元分配子字段。如图18所示，EHT-SIG字段3可包括CC31和CC32，按照CC31，CC32，CC31，CC32的结构在分片3的4个信道上进行传输。如图23所示，在分片3上的CC31包括第九个242-tone RU范围内的资源单元分配子字段9、第十一个242-tone RU范围内的资源单元分配子字段11、第十三个242-tone RU范围内的资源单元分配子字段13、第十五个242-tone RU范围内的资源单元分配子字段15以及所对应的用户特定字段。在分片3上的CC32包括第十个242-tone RU范围内的资源单元分配子字段10、第十二个242-tone RU范围内的资源单元分配子字段12、第十四个242-tone RU范围内的资源单元分配子字段14、第十六个242-tone RU范围内的资源单元分配子字段16以及所对应的用户特定字段。
PPDU还包括承载在分片4上的U-SIG字段4和EHT-SIG字段4，该U-SIG字段4包括带宽字段4。带宽字段4指示的信道带宽为80MHz。因此，EHT-SIG字段4中包括4个资源单元分配子字段。如图18所示，EHT-SIG字段4可包括CC41和CC42。按照CC41，CC42，CC41，CC42的结构在分片4的4个信道上进行传输。如图24所示，在分片4上的CC41包括第十三个242-tone RU范围内的资源单元分配子字段17、第十五个242-tone RU范围内的资源单元分配子字段19以及所对应的用户特定字段。在分片4上的CC42包括第十四个242-tone RU范围内的资源单元分配子字段18、第十六个242-tone RU范围内的资源单元分配子字段20以及所对应的用户特定字段。
需要说明的是，上述第一个242-tone RU至第十六个242-tone RU范围是针对PPDU的整个带宽而言。上述各个CC中也可以不包括中间26-tone RU指示字段。资源单元分配子字段13～资源单元分配子字段16可以与资源单元分配子字段17～资源单元分配子字段20相同或者不同。
结合图18、图21～图24可以发现，在信道1～信道4、信道9～信道16上发送的CC均只包括2个资源单元分配子字段和对应的用户特定字段。信道5～信道8上发送的CC均只包括4个资源单元分配子字段和对应的用户特定字段。对比802.11ax，当PPDU的传输带宽为320MHz时，802.11ax在16个信道上发送的CC均包括8个资源单元分配子字段和对应的用户特定字段。因此，通过将带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量相对应，有利于减少信道上发送的CC包括资源单元分配子字段，有利于节省开销。
在一种可能的实现中，U-SIG字段还包括压缩字段，该压缩字段指示非压缩模式时，该EHT-SIG字段包括(或存在)资源单元分配子字段。该压缩字段指示压缩模式时，该EHT-SIG字段不包括(或不存在)资源单元分配子字段。或者，U-SIG字段中也可以不包括压缩字段，EHT-SIG字段总是包括资源单元分配子字段。
可选的，该压缩字段可以包括1比特。例如，如图25所示，压缩字段的值为1，表示压缩模式。在压缩模式下，EHT-SIG字段中不包括资源单元分配子字段。如图26所示，压缩字段的值为0，表示非压缩模式。在非压缩模式下，EHT-SIG字段中包括资源单元分配子字段。当然，也可以是压缩字段的值为1，表示非压缩模式；压缩字段的值为0，表 示压缩模式。
在一种可能的实现中，分片内停靠的站点的资源用于OFDMA传输，压缩字段指示非压缩模式。相反，分片内停靠的站点的资源用于非OFDMA传输，压缩字段指示压缩模式。在该可选的方式中，可以以分片为粒度确定是否对EHT-SIG字段进行压缩，这样更有利于节省PPDU传输的信令开销。
其中，分片内停靠的站点的资源用于OFDMA传输可包括以下两种情况：
情况1：带宽字段指示的信道带宽用于OFDMA传输，且分片内停靠的站点的资源用于OFDMA传输。例如，如图27所示，带宽字段3指示的信道带宽用于OFDMA传输(也就是说，160MHz信道分配给了站点8、站点9和站点10进行OFDMA传输)，且分片3内的站点的资源(即数据部分4和数据部分5所在的资源单元)是用于OFDMA传输(即分片3内的站点的资源被分配给了站点8和站点9进行OFDMA传输)，因此U-SIG字段3中的压缩字段指示非压缩模式。
情况2：带宽字段指示的信道带宽用于OFDMA传输。例如，在图27中，带宽字段2指示的信道带宽用于OFDMA传输(即80MHz信道分配给了站点6和站点7进行OFDMA传输)。因此，U-SIG字段2中的压缩字段可指示非压缩模式。
其中，分片内停靠的站点的资源用于非OFDMA传输可包括以下两种情况：
情况1：带宽字段指示的信道带宽用于OFDMA传输，但在该分片内停靠的站点的资源用于非OFDMA传输。例如，如图18所示，虽然带宽字段3指示的信道带宽用于OFDMA传输(也就是说，160MHz信道分配给了站点8和站点9进行OFDMA传输)，但分片3内的站点的资源(即数据部分4所在的资源单元)是用于非OFDMA传输(即分片3的站点的资源只分配给了站点8进行非OFDMA传输)，因此U-SIG字段3中的压缩字段可指示压缩模式。
情况2：带宽字段指示的信道带宽用于非OFDMA传输。例如，在图18中，带宽字段1指示的信道带宽用于非OFDMA传输，因此，U-SIG字段1中的压缩字段可指示压缩模式。
在一种可能的实现中，只要带宽字段指示的信道带宽用于OFDMA传输，压缩字段指示非压缩模式。例如，在图18中，带宽字段2～带宽字段4指示的信道带宽均用于OFDMA传输，因此，U-SIG字段2～U-SIG字段4中的压缩字段可指示非压缩模式。
在一种可能的实现中，带宽字段指示的信道带宽用于非OFDMA传输，但是带宽字段指示的信道带宽被打孔，压缩字段可指示非压缩模式。由于打孔之后可能存在多个离散的资源单元，因此，可以采用资源单元分配子字段来指示站点的资源分配情况。例如，在图18中，虽然带宽字段1指示的信道带宽用于非OFDMA传输，但带宽字段1指示的信道带宽被打孔。因此，U-SIG字段1中的压缩字段可指示非压缩模式。
(二)EHT-SIG字段包括前导码打孔指示字段，该前导码打孔指示字段用于指示带宽字段指示的信道带宽被打孔的情况，或者，该前导码打孔指示字段用于指示PPDU的传输带宽被打孔的情况。其中，前导码打孔指示字段的名称也可以替换为信道打孔字段或打孔字段或其他名称。
在该实施方式中，也可以在压缩字段指示压缩模式时，EHT-SIG字段包括前导码打孔指示字段。压缩字段何时指示压缩模式可参见前述描述，在此不赘述。或者，U-SIG字段中也可以不包括压缩字段，EHT-SIG字段总是包括前导码打孔指示字段。前导码打孔指示 字段需要的比特数小于资源单元分配子字段需要的比特数，因此通过前导码打孔指示字段来替代资源单元分配子字段，指示站点的资源单元分配情况，有利于减小PPDU传输的信令开销。
可选的，前导码打孔指示字段出现位置可以与资源单元分配子字段的起始点相同。
前导码打孔指示字段可通过携带索引来指示打孔情况。可以预先定义索引和打孔模式之间的映射关系。例如，一种索引与打孔模式之间的映射关系可如下表3所示。前导码打孔指示字段携带的索引为0时，指示打孔模式为X111。前导码打孔指示字段携带的索引为1时，指示打孔模式为1X11。前导码打孔指示字段携带其他索引时同理，在此不赘述。其中，打孔模式中的每一位代表20MHz。X表示打孔的位置。例如，如果打孔模式为X111，表示80MHz中第一个20MHz被打孔。表3中的RU尺寸列，表示打孔后RU的尺寸。例如，“484+242”表示484-tone RU与242-tone RU合并。“-+996+996”表示两个996-tone RU合并。其中，“-”表示空。RU尺寸列在表3中可以存在也可以不存在。值得一提的是，表3所示的映射关系，可以适用于指示PPDU的传输带宽被打孔的情况，也可以适用于指示带宽字段指示的信道带宽被打孔的情况。
表3
索引 RU尺寸 打孔模式
0 484+242 X111
1 484+242 1X11
2 484+242 11X1
3 484+242 111X
4 484+996 XX11 1111
5 484+996 11XX 1111
6 484+996 1111 XX11
7 484+996 1111 11XX
8 484+242+996 X111 1111
9 484+242+996 1X11 1111
10 484+242+996 11X1 1111
11 484+242+996 111X 1111
12 484+242+996 1111 X111
13 484+242+996 1111 1X11
14 484+242+996 1111 11X1
15 484+242+996 1111 111X
16 484+996+996 XX11 1111 1111
17 484+996+996 11XX 1111 1111
18 484+996+996 1111 XX11 1111
19 484+996+996 1111 11XX 1111
20 484+996+996 1111 1111 XX11
21 484+996+996 1111 1111 11XX
22 -+996+996 XXXX 1111 1111
23 -+996+996 1111 XXXX 1111
24 -+996+996 XXXX 1111 1111
25 484+996+996+996 XX11 1111 1111 1111
26 484+996+996+996 11XX 1111 1111 1111
27 484+996+996+996 1111 XX11 1111 1111
28 484+996+996+996 1111 11XX 1111 1111
29 484+996+996+996 1111 1111 XX11 1111
30 484+996+996+996 1111 1111 11XX 1111
31 484+996+996+996 1111 1111 1111 XX11
32 484+996+996+996 1111 1111 1111 11XX
33 -+996+996+996 XXXX 1111 1111 1111
34 -+996+996+996 1111 XXXX 1111 1111
35 -+996+996+996 XXXX 1111 1111 1111
36 -+996+996+996 1111 1111 1111 XXXX
37 无打孔  
表4是本申请实施例提供的另一种索引与打孔模式之间的映射关系。表4所示的映射关系可以用于指示带宽字段指示的信道带宽被打孔的情况。例如，如果带宽字段指示的信道带宽为80MHz，可以采用表4中80MHz对应的映射关系来指示信道带宽打孔情况。如果带宽字段指示的信道带宽为160MHz，可以采用表4中160MHz对应的映射关系来指示信道带宽打孔情况。如果带宽字段指示的信道带宽为240MHz，可以采用表4中240MHz对应的映射关系来指示信道带宽打孔情况。如果带宽字段指示的信道带宽为320MHz，可以采用表4中320MHz对应的映射关系来指示信道带宽打孔情况。需要说明的是，表4也可被拆分成4个表，每个表格表达一种带宽下的打孔情况。
表4
Figure PCTCN2021078870-appb-000004
Figure PCTCN2021078870-appb-000005
Figure PCTCN2021078870-appb-000006
在一种可能的实现中，在压缩模式下和非压缩模式下，EHT-SIG字段均可包括资源单元分配子字段。在压缩模式下，资源单元分配子字段用于实现上述前导码打孔指示字段的功能，即用于指示带宽字段指示的信道带宽被打孔的情况。在非压缩模式下，资源单元分配子字段用于指示站点的资源单元分配情况。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，前导码打孔指示字段还用于指示MU-MIMO的用户数。也就是说，PPDU既指示EHT-SIG字段的符号数又指示MU-MIMO的用户数。通过实施该可能的实现方式，能够直接告知站点EHT-SIG字段的符号数，使站点能够准确地确定EHT-SIG字段的符号数。
例如，如下表5所示，可以预先定义索引、打孔模式和MU-MIMO的用户数之间的映射关系。前导码打孔指示字段携带的索引为0时，指示打孔模式为X111以及MU-MIMO用户数为1。前导码打孔指示字段携带的索引为1时，指示打孔模式为X111以及MU-MIMO用户数为2。前导码打孔指示字段携带其他索引时同理，在此不赘述。需要注意的是，在表5中索引16-31按照索引号从小到大的顺序，对应的MU-MIMO用户数依次为1,2,3，…,16。同理，索引32-47按照索引号从小到大的顺序，对应的MU-MIMO用户数依次为1,2,3，…,16。32-47之后的索引对应的用户数类似，在此不赘述。
表5
Figure PCTCN2021078870-appb-000007
Figure PCTCN2021078870-appb-000008
在802.11ax中，在非压缩模式下，HE-SIG-A字段用于指示HE-SIG-B字段的符号数。在压缩模式下，HE-SIG-A字段用于指示MU-MIMO的用户数。在压缩模式下，HE-SIG-B字段的符号数，基于MU-MIMO的用户数计算得出。但在本申请实施例中，由于具有多个 分片，各个分片上的EHT-SIG字段的符号数需要对齐。例如，PPDU的传输带宽被划分为4个分片。分片1上的EHT-SIG字段1～分片4上的EHT-SIG字段4的符号数要保持一致。如果接入点基于分片1的MU-MIMO的用户数计算出EHT-SIG字段1的符号数为7。接入点基于分片2的MU-MIMO的用户数计算出EHT-SIG字段2的符号数为5。接入点基于分片3的MU-MIMO的用户数计算出EHT-SIG字段3的符号数为4。接入点基于分片4的MU-MIMO的用户数计算出EHT-SIG字段4的符号数为4。那么接入点生成PPDU时，为了使EHT-SIG字段1～分片4的EHT-SIG字段4的符号数对齐，需要将EHT-SIG字段2～EHT-SIG字段4的符号数进行填充，填充为7个符号。分片2的站点接收EHT-SIG字段2之后，通过MU-MIMO的用户数计算出EHT-SIG字段2的符号数为5。实际上EHT-SIG字段2的符号数为7，但分片2的站点会误认为EHT-SIG字段2的符号数为5。分片3和分片4的站点同样会错误地确定其EHT-SIG字段的符号数。因此，在本申请实施例中，通过在U-SIG字段中携带EHT-SIG字段的符号数，能够直接告知站点EHT-SIG字段的符号数，使站点能够准确地确定EHT-SIG字段的符号数。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，PPDU还包括承载在分片的第一字段，该第一字段用于指示MU-MIMO的用户数，第一字段与前导码打孔指示字段不相同。在该可能的实施方式中，也可以通过PPDU中的与前导码打孔指示字段不相同的一个字段来指示MU-MIMO的用户数。通过实施该可能的实现方式，接入点能够直接告知站点EHT-SIG字段的符号数，使站点能够准确地确定EHT-SIG字段的符号数。
上面介绍了可以以分片为粒度对EHT-SIG字段进行压缩，下面介绍以PPDU的整个传输带宽为粒度对EHT-SIG字段进行压缩的相关内容：
在一种可能的实现中，若PPDU的传输带宽用于非OFDMA传输，则压缩字段指示压缩模式。也就是说，只在PPDU的整个传输带宽用于非正交频分多址OFDMA传输时，压缩字段指示压缩模式。这样有利于节省PPDU传输的信令开销。例如，如图28所示，PPDU的320MHz传输带宽作为一个整体分配给站点1～站点5进行MU-MIMO传输。分片1～分片4中的压缩字段均指示压缩模式，分片1中的EHT-SIG字段1～分片4中的EHT-SIG字段4均不包括资源单元分配子字段。
在一种可能的实现中，PPDU包括的承载于多个分片上的EHT-SIG字段相同。例如，图28所示的EHT-SIG字段1～EHT-SIG字段4相同。基于该可能的实现方式，站点1～站点5也可以在其他分片上接收EHT-SIG字段，可以增加EHT-SIG字段传输的可靠性。
在一种可能的实现中，同一个分片的EHT-SIG字段在该分片的不同信道相同。例如，如图28所示，EHT-SIG字段1在信道13～信道16上的内容相同。EHT-SIG字段2在信道9～信道12上的内容相同。EHT-SIG字段3在信道5～信道8上的内容相同。EHT-SIG字段4在信道1～信道4上的内容相同。基于该可能的实现方式，可以增加EHT-SIG字段传输的可靠性。
在一种可能的实现中，压缩字段指示压缩模式，U-SIG字段还用于指示MU-MIMO的用户数。在该可能的实现中，各个分片的U-SIG字段指示的MU-MIMO的用户数。通过实施该可能的实现方式，基于MU-MIMO的用户数就能准确地确定EHT-SIG字段的符号数，不用携带额外的信令来指示EHT-SIG字段的符号数，有利于减小信令开销。
在一种可能的实现中，压缩字段指示压缩模式，EHT-SIG字段包括前导码打孔指示字段，该前导码打孔指示字段用于指示PPDU的传输带宽被打孔的情况。其中，可采用上表 3的映射关系来指示PPDU的传输带宽被打孔的情况。在该可能的实现中，通过前导码打孔指示字段来替代资源单元分配子字段，指示站点的资源单元分配情况，有利于减小PPDU传输的信令开销。
请参见图29，图29示出了本申请实施例的一种通信装置的结构示意图。图29所示的通信装置可以用于执行上述图12所描述的方法实施例中接入点的部分或全部功能。该装置可以是接入点，也可以是接入点中的装置，或者是能够和接入点匹配使用的装置。其中，该通信装置还可以为芯片系统。图29所示的通信装置可以包括通信单元2901和处理单元2902。该通信单元也可以称为收发单元，或者该通信单元包括接收单元和发送单元。处理单元2902，用于进行数据处理。其中：
处理单元2902，用于生成物理层协议数据单元PPDU，其中，该PPDU的传输带宽被划分为多个分片，该PPDU包括承载在一个分片上的通用信令U-SIG字段，该U-SIG字段包括带宽字段，该带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽；通信单元2901，用于向站点发送PPDU。
在一种可能的实现中，PPDU还包括承载在一个分片上的EHT-SIG字段；EHT-SIG字段包括资源单元分配子字段，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量相对应，资源单元分配子字段用于指示为分片内停靠的站点分配的资源单元。
在一种可能的实现中，若带宽字段所指示的带宽为兆赫兹40MHz，则U-SIG字段和EHT-SIG字段在40MHz带宽上传输。
在一种可能的实现中，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系包括以下一种或多种：若带宽字段所指示的带宽为20兆赫兹MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为1个；若带宽字段所指示的带宽为40MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为2个；若带宽字段所指示的带宽为80MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为4个；若带宽字段所指示的带宽为160MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为8个；若带宽字段所指示的带宽为240MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为12个；或，若带宽字段所指示的带宽为320MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为16个。
在一种可能的实现中，EHT-SIG字段包括前导码打孔指示字段，该前导码打孔指示字段用于指示带宽字段指示的信道带宽被打孔的情况。
在一种可能的实现中，U-SIG字段还包括压缩字段，该压缩字段指示压缩模式时，该EHT-SIG字段包括所述前导码打孔指示字段。
在一种可能的实现中，分片内停靠的站点的资源用于非OFDMA传输时，压缩字段指示压缩模式。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，前导码打孔指示字段还用于指示多用户多输入多输出MU-MIMO的用户数。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，PPDU还包括承载在分片的第一字段，第一字段用于指示多用户多输入多输出MU-MIMO的用户数，第一字段与前导码打孔指示字段不相同。
在一种可能的实现中，PPDU还包括承载在一个分片上的EHT-SIG字段，U-SIG字段 还包括压缩字段，若PPDU的传输带宽用于非OFDMA传输，则压缩字段指示压缩模式。
在一种可能的实现中，若压缩字段指示压缩模式，则U-SIG字段还用于指示多用户多输入多输出MU-MIMO的用户数。
在一种可能的实现中，若压缩字段指示压缩模式，则EHT-SIG字段包括前导码打孔指示字段，前导码打孔指示字段用于指示PPDU的传输带宽被打孔的情况。
在一种可能的实现中，PPDU包括的承载于多个分片上的EHT-SIG字段相同。
请参见图29，图29示出了本申请实施例的一种通信装置的结构示意图。图29所示的通信装置可以用于执行上述图12所描述的方法实施例中站点的部分或全部功能。该装置可以是站点，也可以是站点的中的装置，或者是能够和站点匹配使用的装置。其中，该通信装置还可以为芯片系统。图29所示的通信装置可以包括通信单元2901和处理单元2902。该通信单元也可以称为收发单元，或者该通信单元包括接收单元和发送单元。处理单元2902，用于进行数据处理。其中：
通信单元2901，用于接收接入点发送的物理层协议数据单元PPDU，其中，PPDU的传输带宽被划分为多个分片，PPDU包括承载在一个分片上的通用信令U-SIG字段，U-SIG字段包括带宽字段，带宽字段指示分片内停靠的站点被分配的资源单元所在的信道带宽；处理单元2902，用于根据接收的U-SIG字段确定被分配的资源单元所在的信道带宽。
在一种可能的实现中，PPDU还包括承载在一个分片上的EHT-SIG字段；EHT-SIG字段包括资源单元分配子字段，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量相对应，资源单元分配子字段用于指示为分片内停靠的站点分配的资源单元。
在一种可能的实现中，若带宽字段所指示的带宽为兆赫兹40MHz，则U-SIG字段和EHT-SIG字段在40MHz带宽上传输。
在一种可能的实现中，带宽字段所指示的带宽与EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系包括以下一种或多种：若带宽字段所指示的带宽为20兆赫兹MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为1个；若带宽字段所指示的带宽为40MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为2个；若带宽字段所指示的带宽为80MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为4个；若带宽字段所指示的带宽为160MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为8个；若带宽字段所指示的带宽为240MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为12个；或，若带宽字段所指示的带宽为320MHz，则EHT-SIG字段包括的资源单元分配子字段的数量为16个。
在一种可能的实现中，EHT-SIG字段包括前导码打孔指示字段，该前导码打孔指示字段用于指示带宽字段指示的信道带宽被打孔的情况。
在一种可能的实现中，U-SIG字段还包括压缩字段，该压缩字段指示压缩模式时，该EHT-SIG字段包括所述前导码打孔指示字段。
在一种可能的实现中，分片内停靠的站点的资源用于非OFDMA传输时，压缩字段指示压缩模式。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，前导码打孔指示字段还用于指示多用户多输入多输出MU-MIMO的用户数。
在一种可能的实现中，U-SIG字段还用于指示EHT-SIG字段的符号数，PPDU还包括 承载在分片的第一字段，第一字段用于指示多用户多输入多输出MU-MIMO的用户数，第一字段与前导码打孔指示字段不相同。
在一种可能的实现中，PPDU还包括承载在一个分片上的EHT-SIG字段，U-SIG字段还包括压缩字段，若PPDU的传输带宽用于非OFDMA传输，则压缩字段指示压缩模式。
在一种可能的实现中，若压缩字段指示压缩模式，则U-SIG字段还用于指示多用户多输入多输出MU-MIMO的用户数。
在一种可能的实现中，若压缩字段指示压缩模式，则EHT-SIG字段包括前导码打孔指示字段，前导码打孔指示字段用于指示PPDU的传输带宽被打孔的情况。
在一种可能的实现中，PPDU包括的承载于多个分片上的EHT-SIG字段相同。
如图30a所示为本申请实施例提供的一种通信装置300，用于实现上述图12所描述的方法实施例中站点或接入点的功能；该装置可以是站点或接入点，或该装置可以是用于站点的装置或用于接入点的装置。用于站点的装置可以为站点内的芯片系统或芯片。用于接入点的装置可以为接入点内的芯片系统或芯片。其中，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。
通信装置300包括至少一个处理器3020，用于实现本申请上述应用于无线局域网的带宽指示方法中站点或接入点的数据处理功能。
装置300还可以包括通信接口3010，用于实现本申请上述应用于无线局域网的带宽指示方法中站点或接入点的收发操作。
在本申请实施例中，通信接口可以是收发器、电路、总线、模块或其它类型的通信接口，用于通过传输介质和其它设备进行通信。例如，通信接口3010用于装置300中的装置可以和其它设备进行通信。处理器3020利用通信接口3010收发数据，并用于实现上述方法实施例所述的方法。
装置300还可以包括至少一个存储器3030，用于存储程序指令和/或数据。存储器3030和处理器3020耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器3020可能和存储器3030协同操作。处理器3020可能执行存储器3030中存储的程序指令。所述至少一个存储器中的至少一个可以包括于处理器中。
本申请实施例中不限定上述通信接口3010、处理器3020以及存储器3030之间的具体连接介质。本申请实施例在图30a中以存储器3030、通信接口3020以及通信接口3010之间通过总线3040连接，总线在图30a中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图30a中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
装置300具体是用于站点或接入点的装置时，例如装置300具体是芯片或者芯片系统时，通信接口3010所输出或接收的可以是基带信号。装置300具体是站点或接入点时，通信接口3010所输出或接收的可以是射频信号。在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列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，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的 硬件及软件模块组合执行完成。
作为示例，图30b为本申请实施例提供的另一种站点3000的结构示意图。该站点可执行上述图12中站点所执行的操作。
为了便于说明，图30b仅示出了站点的主要部件。如图30b所示，站点3000包括处理器、存储器、射频电路、天线以及输入输出装置。处理器主要用于对通信协议以及通信数据进行处理，以及对整个站点进行控制，执行软件程序，处理软件程序的数据，例如用于支持站点执行图12所描述的流程中站点所执行的操作。存储器主要用于存储软件程序和数据。射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。站点3000还可以包括输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。需要说明的是，有些种类的站点可以不具有输入输出装置。
当站点开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到站点时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图30b仅示出了一个存储器和处理器。在实际的站点中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器(central processing unit，CPU)，基带处理器主要用于对通信协议以及通信数据进行处理，CPU主要用于对整个站点进行控制，执行软件程序，处理软件程序的数据。可选的，该处理器还可以是网络处理器(network processor，NP)或者CPU和NP的组合。处理器还可以进一步包括硬件芯片。上述硬件芯片可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device，CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic,GAL)或其任意组合。存储器可以包括易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)；存储器也可以包括非易失性存储器(non-volatile memory)，例如快闪存储器(flash memory)，硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)；存储器还可以包括上述种类的存储器的组合。
示例性的，在本申请实施例中，如图30b所示，可以将具有收发功能的天线和射频电路视为站点3000的通信单元3001，将具有处理功能的处理器视为站点3000的处理单元3002。
通信单元3001也可以称为收发器、收发机、收发装置、收发单元等，用于实现收发功能。可选的，可以将通信单元3001中用于实现接收功能的器件视为接收单元，将通信单元3001中用于实现发送功能的器件视为发送单元，即通信单元3001包括接收单元和发送单元。示例性的，接收单元也可以称为接收机、接收器、接收电路等，发送单元可以称 为发射机、发射器或者发射电路等。
在一些实施例中，通信单元3001、处理单元3002可能集成为一个器件，也可以分离为不同的器件，此外，处理器与存储器也可以集成为一个器件，或分立为不同器件。
其中，通信单元3001可用于执行上述方法实施例中站点的收发操作。处理单元3002可用于执行上述方法实施例中站点的数据处理操作。
本申请实施例还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在处理器上运行时，用于执行上述方法实施例中站点执行的方法。
本申请实施例还提供一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在处理器上运行时，用于执行上述方法实施例中接入点执行的方法。
本申请实施例还提供一种计算机程序产品，当所述计算机程序产品在处理器上运行时，用于执行上述方法实施例中站点执行的方法。
本申请实施例还提供一种计算机程序产品，当所述计算机程序产品在处理器上运行时，用于执行上述方法实施例中接入点执行的方法。
基于同一发明构思，本申请实施例中提供的各装置解决问题的原理与本申请方法实施例相似，因此各装置的实施可以参见方法的实施，为简洁描述，在这里不再赘述。
需要说明的是，对于前述的各方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本申请并不受所描述的动作顺序的限制，因为依据本申请，某些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本申请所必须的。
本申请提供的各实施例的描述可以相互参照，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。为描述的方便和简洁，例如关于本申请实施例提供的各装置、设备的功能以及执行的步骤可以参照本申请方法实施例的相关描述，各方法实施例之间、各装置实施例之间也可以互相参考、结合或引用。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (35)

  1. 一种通信装置，其特征在于，所述通信装置包括：
    处理单元，用于生成物理层协议数据单元PPDU，其中，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在所述多个分片中的至少一个分片上的通用信令U-SIG字段，所述U-SIG字段包括带宽字段，所述带宽字段指示所述分片内停靠的站点被分配的资源单元所在的信道带宽；
    通信单元，用于向站点发送所述PPDU。
  2. 一种通信装置，其特征在于，所述通信装置包括：
    通信单元，用于接收接入点发送的物理层协议数据单元PPDU，其中，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在一个所述分片上的通用信令U-SIG字段，所述U-SIG字段包括带宽字段，所述带宽字段指示所述分片内停靠的站点被分配的资源单元所在的信道带宽；
    处理单元，用于根据接收的U-SIG字段确定被分配的资源单元所在的信道带宽。
  3. 根据权利要求1或2所述的装置，其特征在于，所述PPDU还包括承载在一个所述分片上的极高吞吐率信令EHT-SIG字段；所述EHT-SIG字段包括资源单元分配子字段，所述带宽字段所指示的带宽与所述EHT-SIG字段包括的资源单元分配子字段的数量相对应，所述资源单元分配子字段用于指示所述分片内停靠的站点被分配的资源单元。
  4. 根据权利要求3所述的装置，其特征在于，若所述带宽字段所指示的带宽为40兆赫兹MHz，则所述U-SIG字段和所述EHT-SIG字段在所述40MHz带宽上传输。
  5. 根据权利要求3或4所述的装置，其特征在于，所述带宽字段所指示的带宽与所述EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系包括以下一种或多种：
    若所述带宽字段所指示的带宽为20兆赫兹MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为1个；
    若所述带宽字段所指示的带宽为40MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为2个；
    若所述带宽字段所指示的带宽为80MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为4个；
    若所述带宽字段所指示的带宽为160MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为8个；
    若所述带宽字段所指示的带宽为240MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为12个；或，
    若所述带宽字段所指示的带宽为320MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为16个。
  6. 根据权利要求1或2所述的装置，其特征在于，所述PPDU还包括承载在一个所述 分片上的极高吞吐率信令EHT-SIG字段；所述EHT-SIG字段包括前导码打孔指示字段，所述前导码打孔指示字段用于指示所述带宽字段指示的信道带宽被打孔的情况。
  7. 根据权利要求6所述的装置，其特征在于，所述U-SIG字段还包括压缩字段，若所述压缩字段指示压缩模式，所述EHT-SIG字段包括所述前导码打孔指示字段。
  8. 根据权利要求7所述的装置，其特征在于，若所述分片内停靠的站点的资源用于非OFDMA传输，所述压缩字段指示压缩模式。
  9. 根据权利要求6～8中任意一项所述的装置，其特征在于，所述U-SIG字段还用于指示所述EHT-SIG字段的符号数，所述前导码打孔指示字段还用于指示多用户多输入多输出MU-MIMO的用户数。
  10. 根据权利要求6～8中任意一项所述的装置，其特征在于，所述U-SIG字段还用于指示所述EHT-SIG字段的符号数，所述PPDU还包括承载在所述分片的第一字段，所述第一字段用于指示多用户多输入多输出MU-MIMO的用户数，所述第一字段与所述前导码打孔指示字段不相同。
  11. 一种应用于无线局域网的带宽指示方法，其特征在于，所述方法包括：
    接入点生成物理层协议数据单元PPDU，其中，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在一个所述分片上的通用信令U-SIG字段，所述U-SIG字段包括带宽字段，所述带宽字段指示所述分片内停靠的站点被分配的资源单元所在的信道带宽；
    所述接入点向站点发送所述PPDU。
  12. 一种应用于无线局域网的带宽指示方法，其特征在于，所述方法包括：
    站点接收接入点发送的物理层协议数据单元PPDU，其中，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在一个所述分片上的通用信令U-SIG字段，所述U-SIG字段包括带宽字段，所述带宽字段指示所述分片内停靠的站点被分配的资源单元所在的信道带宽；
    所述站点根据接收的U-SIG字段确定被分配的资源单元所在的信道带宽。
  13. 根据权利要求11或12所述的方法，其特征在于，所述PPDU还包括承载在一个所述分片上的极高吞吐率信令EHT-SIG字段；所述EHT-SIG字段包括资源单元分配子字段，所述带宽字段所指示的带宽与所述EHT-SIG字段包括的资源单元分配子字段的数量相对应，所述资源单元分配子字段用于指示所述分片内停靠的站点被分配的资源单元。
  14. 根据权利要求13所述的方法，其特征在于，若所述带宽字段所指示的带宽为40兆赫兹MHz，则所述U-SIG字段和所述EHT-SIG字段在所述40MHz带宽上传输。
  15. 根据权利要求13或14所述的方法，其特征在于，所述带宽字段所指示的带宽与所 述EHT-SIG字段包括的资源单元分配子字段的数量之间的对应关系包括以下一种或多种：
    若所述带宽字段所指示的带宽为20兆赫兹MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为1个；
    若所述带宽字段所指示的带宽为40MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为2个；
    若所述带宽字段所指示的带宽为80MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为4个；
    若所述带宽字段所指示的带宽为160MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为8个；
    若所述带宽字段所指示的带宽为240MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为12个；或，
    若所述带宽字段所指示的带宽为320MHz，则所述EHT-SIG字段包括的资源单元分配子字段的数量为16个。
  16. 根据权利要求11或12所述的方法，其特征在于，所述PPDU还包括承载在一个所述分片上的极高吞吐率信令EHT-SIG字段；所述EHT-SIG字段包括前导码打孔指示字段，所述前导码打孔指示字段用于指示所述带宽字段指示的信道带宽被打孔的情况。
  17. 根据权利要求16所述的方法，其特征在于，所述U-SIG字段还包括压缩字段，若所述压缩字段指示压缩模式，所述EHT-SIG字段包括所述前导码打孔指示字段。
  18. 根据权利要求17所述的方法，其特征在于，若所述分片内停靠的站点的资源用于非OFDMA传输，所述压缩字段指示压缩模式。
  19. 根据权利要求16～18中任意一项所述的方法，其特征在于，若所述U-SIG字段还用于指示所述EHT-SIG字段的符号数，所述前导码打孔指示字段还用于指示多用户多输入多输出MU-MIMO的用户数。
  20. 根据权利要求16～18中任意一项所述的方法，其特征在于，所述U-SIG字段还用于指示所述EHT-SIG字段的符号数，所述PPDU还包括承载在所述分片的第一字段，所述第一字段用于指示多用户多输入多输出MU-MIMO的用户数，所述第一字段与所述前导码打孔指示字段不相同。
  21. 一种通信装置，其特征在于，所述通信装置包括：
    处理单元，用于生成物理层协议数据单元PPDU，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在所述多个分片中的至少一个分片上的通用信令U-SIG字段和极高吞吐率信令EHT-SIG字段；所述PPDU的传输带宽用于非OFDMA传输，所述EHT-SIG字段中不包括资源单元分配子字段，所述U-SIG字段指示所述EHT-SIG字段的符号数，所述PPDU还包括承载在所述多个分片中的至少一个分片上的第一字段，所述第一字段指示多用户多输入多输出MU-MIMO的用户数；
    通信单元，用于向站点发送所述PPDU。
  22. 一种通信装置，其特征在于，所述通信装置包括：
    通信单元，用于接收物理层协议数据单元PPDU，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在所述多个分片中的至少一个分片上的通用信令U-SIG字段和极高吞吐率信令EHT-SIG字段；所述PPDU的传输带宽用于非OFDMA传输，所述EHT-SIG字段中不包括资源单元分配子字段，所述U-SIG字段指示所述EHT-SIG字段的符号数，所述PPDU还包括承载在所述多个分片中的至少一个分片上的第一字段，所述第一字段指示多用户多输入多输出MU-MIMO的用户数；
    处理单元，用于基于所述U-SIG字段和所述第一字段确定EHT-SIG符号数和MU-MIMO的用户数。
  23. 根据权利要求21或22所述的装置，其特征在于，所述PPDU中承载于不同分片上的EHT-SIG字段相同。
  24. 根据权利要求21～23中任意一项所述的装置，其特征在于，所述PPDU中承载于同一个分片内不同信道上的EHT-SIG字段相同。
  25. 一种应用于无线局域网的PPDU传输方法，其特征在于，所述方法包括：
    接入点生成物理层协议数据单元PPDU，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在所述多个分片中的至少一个分片上的通用信令U-SIG字段和极高吞吐率信令EHT-SIG字段；所述PPDU的传输带宽用于非OFDMA传输，所述EHT-SIG字段中不包括资源单元分配子字段，所述U-SIG字段指示所述EHT-SIG字段的符号数，所述PPDU还包括承载在所述多个分片中的至少一个分片上的第一字段，所述第一字段指示多用户多输入多输出MU-MIMO的用户数；
    所述接入点向站点发送所述PPDU。
  26. 一种应用于无线局域网的PPDU传输方法，其特征在于，所述方法包括：
    站点接收物理层协议数据单元PPDU，所述PPDU的传输带宽被划分为多个分片，所述PPDU包括承载在所述多个分片中的至少一个分片上的通用信令U-SIG字段和极高吞吐率信令EHT-SIG字段；所述PPDU的传输带宽用于非OFDMA传输，所述EHT-SIG字段中不包括资源单元分配子字段，所述U-SIG字段指示所述EHT-SIG字段的符号数，所述PPDU还包括承载在所述多个分片中的至少一个分片上的第一字段，所述第一字段指示多用户多输入多输出MU-MIMO的用户数；
    所述站点基于所述U-SIG字段和所述第一字段确定EHT-SIG符号数和MU-MIMO的用户数。
  27. 根据权利要求25或26所述的方法，其特征在于，所述PPDU中承载于不同分片上的EHT-SIG字段相同。
  28. 根据权利要求25～27中任意一项所述的方法，其特征在于，所述PPDU中承载于同一个分片内不同信道上的EHT-SIG字段相同。
  29. 一种通信装置，所述通信装置包括处理器，当所述处理器执行存储器中的计算机程序时，如权利要求11～20或25～28中任意一项所述的方法被执行。
  30. 一种通信装置，其特征在于，包括处理器和存储器；
    所述存储器用于存储计算机执行指令；
    所述处理器用于执行所述存储器所存储的计算机执行指令，以使所述通信装置执行如权利要求11～20或25～28中任一项所述的方法。
  31. 一种通信装置，其特征在于，包括处理器、存储器和收发器；
    所述收发器，用于接收信号或者发送信号；
    所述存储器，用于存储计算机程序；
    所述处理器，用于从所述存储器调用所述计算机程序执行如权利要求11～20或25～28中任一项所述的方法。
  32. 一种通信装置，其特征在于，包括处理器和通信接口；
    所述通信接口，用于接收计算机程序并传输至所述处理器；所述处理器运行所述计算机执行指令以执行如权利要求11～20或25～28中任一项所述的方法。
  33. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质用于存储计算机执行指令，当所述计算机执行指令被执行时，使如权利要求11～20或25～28中任一项所述的方法被实现。
  34. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序，当所述计算机程序被执行时，使如权利要求11～20或25～28中任一项所述的方法被实现。
  35. 一种通信装置，其特征在于，所述通信装置用于执行如权利要求11～20或25～28中任一项所述的方法。
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