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BR-122025009975-A2 - METHOD OF BANDWIDTH INDICATION APPLIED IN WIRELESS LOCAL AREA NETWORK AND COMMUNICATION DEVICE

BR122025009975A2BR 122025009975 A2BR122025009975 A2BR 122025009975A2BR-122025009975-A2

Abstract

This application provides a bandwidth indication method applied in a wireless local area network supporting the 802.11be standard and a communication device. The method includes: An access point generates a physical layer protocol data unit (PPDU), wherein a transmission bandwidth of the PPDU is divided into a plurality of segments; the PPDU includes a U-SIG universal signal field carried in a segment; the U-SIG field includes a bandwidth field; and the bandwidth field indicates a channel bandwidth of a resource unit allocated to a station stationed on the segment; and the access point sends the PPDU to the station. The method in this application can be used to reduce signaling overheads from PPDU transmission, and resources between segments can be allocated to the station, so that resources can be allocated more flexibly.

Inventors

  • Jian Yu
  • Mengshi HU
  • Ming Gan

Assignees

  • HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date
20260310
Application Date
20210303
Priority Date
20200430

Claims (9)

  1. 1. A communication method applied in a wireless local area network, CHARACTERIZED in that the method comprises: receiving, by a communication device, a physical layer protocol data unit (PPDU), wherein a transmission bandwidth of the PPDU is divided into a plurality of segments, the PPDU comprises a universal signal field (U-SIG) and an extremely high throughput signal field (EHT-SIG), wherein the U-SIG field and the EHT-SIG field are carried in at least one segment among the plurality of segments, the transmission bandwidth of the PPDU is used for non-OFDMA transmission, the U-SIG field indicates the number of EHT-SIG symbols, the PPDU additionally comprises a first field, wherein the first field is carried in at least one segment among the plurality of segments, and the first field indicates the number of multiple-input multiple-output multiple-user (MU-MIMO) users.
  2. 2. Method, according to claim 1, CHARACTERIZED in that the method further comprises: determining, by the communication device, the number of EHT-SIG Symbols and the number of MU-MIMO users based on the U-SIG field and the first field respectively.
  3. 3. Method, according to claim 1 or 2, CHARACTERIZED in that the EHT-SIG field does not comprise a resource unit allocation subfield.
  4. 4. Method, according to any one of claims 1 to 3, CHARACTERIZED in that the EHT-SIG fields carried in different segments in the PPDU are the same.
  5. 5. Method, according to any one of claims 1 to 4, CHARACTERIZED in that EHT-SIG fields carried on different channels in the same segment in the PPDU are the same.
  6. 6. Method, according to claim 5, CHARACTERIZED in that each channel of the different channels is 20 MHz.
  7. 7. A method according to any one of claims 1 to 6, characterized in that at least one segment among the plurality of segments is 80 MHz.
  8. 8. Communication apparatus, CHARACTERIZED in that the communication apparatus comprises a processor, and when the processor executes a computer program in a memory, the method as defined in any one of claims 1 to 7 is performed.
  9. 9. Computer-readable storage media, CHARACTERIZED in that the computer-readable storage media is configured to store computer-executable instructions, and when the computer-executable instructions are executed, the method as defined in any one of claims 1 to 7 is implemented.

Description

[0001] This application claims priority to Chinese Patent Application No. 202010366775.6, filed with the National Intellectual Property Administration of China on April 30, 2020, and entitled “BANDWIDTH INDICATION METHOD APPLIED IN WIRELESS LOCAL AREA NETWORK AND COMMUNICATION APPARATUS”, which is incorporated herein by reference in its entirety. TECHNICAL FIELD [0002] The present invention relates to the field of communication and, in particular, to a method of indicating bandwidth applied in a wireless local area network and a communication device. FUNDAMENTALS [0003] WLAN standards have evolved over many generations, including 802.11a/b/g, 802.11n, 802.11ac, 802.11ax, and 802.11be (also known as Wi-Fi 7) under discussion. The 802.11n, 802.11ac, 802.11ax, and 802.11be standards are also referred to as HT (High Throughput), VHT (Very High Throughput), HE (High Efficiency), and EHT (Extremely High Throughput) technologies, respectively. [0004] The 802.11ax standard supports the following bandwidth configurations: 20 MHz, 40 MHz, 80 MHz, 160 MHz, and 80+80 MHz. A difference between 160 MHz and 80+80 MHz is that a 160 MHz frequency band is continuous, but 80+80 MHz frequency bands can be separated. The 802.11be standard supports 240 MHz, 320 MHz, and similar frequencies. [0005] User frequency band resources are allocated by resource units (RUs) instead of 20 MHz channels. An RU can have the following forms, for example, a 26-tone RU, a 52-tone RU, a 106-tone RU, a 242-tone RU, a 484-tone RU, and a 996-tone RU, where tone represents a subcarrier. For example, Figure 1 is a schematic diagram of subcarrier and RU distribution in an 80 MHz bandwidth. As shown in Figure 1, the entire 80 MHz bandwidth includes four resource units in the form of 242-tone RUs. In particular, there is a central 26-tone RU, including two 13-tone subunits in the middle of the entire bandwidth. Alternatively, the entire bandwidth may include a single 996-tone RU, or it may include various combinations of 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, and 484-tone RUs. [0006] The 802.11ax standard provides a method for indicating orthogonal frequency division multiple access (OFDMA) resource units for downlink (DL) and a method for indicating multiple input multiple output (MIMO) resource units for multiple users (MU) for downlink (DL). In the 802.11ax standard, a transmission termination sends a physical protocol data unit (PPDU). The PPDU includes a high-efficiency-signal field-A and a high-efficiency-signal field-B. The HE-SIG-A is used to indicate a symbol length and a modulation and coding scheme (MCS) of the HE-SIG-B, a bandwidth of the entire PPDU, and the like. If the PPDU bandwidth is greater than 20 MHz, HE-SIG-A is duplicated on each 20 MHz channel for transmission. The PPDU additionally includes HE-SIG-B, which provides DL MU MIMO and DL OFDMA feature indication information. HE-SIG-B is individually encoded on each 20 MHz channel. An encoding structure of HE-SIG-B on each 20 MHz channel is shown in Figure 2. The entire HE-SIG-B is divided into two parts: a common field and a user-specific field. The common field includes 1 to N resource unit allocation subfields (RU allocation subfields), a Center 26-Tone indication field included in a bandwidth greater than or equal to 80 MHz, a Cyclic Redundancy Code (CRC), and a tail subfield for cyclic decoding. The user-specific field includes 1 to M user fields according to a resource unit allocation sequence. In the M user fields, two user fields constitute a group, followed by a CRC field and a tail field, but the last group is not the case. In the last group, there may be one or two user fields. [0007] A content channel (CC) concept is introduced in the 802.11ax standard. Figure 3 is a schematic diagram of an HE-SIG-B field in an 80 MHz bandwidth of a PPDU. As shown in Figure 3, in the 80 MHz bandwidth of the PPDU, the HE-SIG-B field includes two CCs encompassing four channels in total. A structure of a CC1, a CC2, a CC1, and a CC2, which are sequenced based on frequencies in ascending order, is used to indicate resource unit allocation information across the four channels. CC1 includes resource unit allocation subfields within RU#1 of 242 tones and RU#3 of 242 tones, and corresponding user fields. CC2 includes resource unit allocation subfields within RU#2 of 242 tones and RU#4 of 242 tones, and corresponding user fields. Furthermore, a central 26-tone RU indication in the 80 MHz bandwidth is carried in each of the two CCs to indicate whether the resource unit is used for data transmission. Similarly, in a 160 MHz bandwidth of a PPDU, the HE-SIG-B field includes two CCs, encompassing eight channels in total. A structure of CC1, CC2, CC1, CC2, CC1, CC2, CC1, and CC2, sequenced based on frequencies in ascending order, is used to indicate resource unit allocation information across the eight channels. CC1 includes resource unit allocation subfields within RU# 1 of 242 tones, RU#