Communication method and apparatus
A method includes: generating, by an access point AP, a first frame, where the first frame includes P station information fields, each of the P station information fields corresponds to one resource unit RU allocated to a first station STA, P is a positive integer greater than 1, each station information field further includes end indication information, and the end indication information is used to indicate whether the station information field is the last station information field in the P station information fields. The AP may allocate P RUs to the first STA, and indicate the P RUs to the first STA through the P station information fields in the first frame. Therefore, a resource allocation manner of the AP can be more flexible, a frequency selective gain of an OFDMA system can be effectively improved, and a system capacity can be increased.
1 . A communication method, applied for an access point (AP), the method comprising:
determining, a transmission bandwidth, which is used for the AP communicating with one or more stations (STAs), wherein the transmission bandwidth is 320 MHz including four independent 80 MHz transmission bandwidths, and the 320 MHz transmission bandwidth comprises 4096 subcarriers;
wherein the 320 MHz transmission bandwidth comprises 12 left-sideband subcarriers and 11 right-sideband subcarriers, and wherein four 996-subcarrier resource units (RUS) exist between the 12 left-sideband subcarriers and the 11 right-sideband subcarriers, and the four 996-RUs are located in [−2036: −1539 −1533: −1036], [−1035: −538-532: −35], [35: 532 538: 1035] and [1036: 1533 1539: 2036], and null subcarriers of each 996-subcarrier RU are located in [−1538: −1534], [−537: −533], [533: 537], and [1534: 1538], and one 52-subcarrier RU located in [−34: −9 9: 34] and direct current subcarriers are included between a second 996-subcarrier RU and a third 996-subcarrier RU;
communicating a physical protocol data unit (PPDU), with the one or more stations (STAs) by using the transmission bandwidth, wherein the PPDU carries indication information indicating whether the 52-subcarrier RU located is used;
wherein the PPDU further indicates M channel estimation subcarriers, which are comprised in a first extremely high throughput (EHT) signaling field of the PPDU, wherein M is determined by the AP based on a quantity of subcarriers used in a second EHT signaling field of the PPDU and a quantity of channel estimation subcarriers provided by a legacy preamble of the PPDU and a binary phase shift keying (BPSK) symbol field of the PPDU within a range of a second bandwidth, and M is a positive integer; and
wherein the second bandwidth is 2 N times a first bandwidth, N is 0 or a positive integer, and the first bandwidth and the second bandwidth are part of the transmission bandwidth.
2 . The communication method according to claim 1 , wherein a sequence number range of the 12 left-sideband subcarriers is [−2048: −2037], and a sequence number range of the 11 right-sideband subcarriers is [2037: 2047].
3 . The communication method according to claim 1 , wherein a subcarrier sequence number range of a first RU in the four 996-subcarrier RUs is [−2036: −1539, −1533: −1036]; and a sequence number range of the null subcarrier of the first RU is [−1538: −1534].
4 . The communication method according to claim 1 , wherein a subcarrier sequence number range of a fourth RU in the four 996-subcarrier RUs is [1036: 1533, 1539: 2036]; and a sequence number range of the null subcarrier of the fourth RU is [1534: 1538].
5 . The communication method according to claim 1 , wherein the center of the 996 subcarriers comprise five null subcarriers.
6 . The communication method according to claim 1 , wherein a center of the transmission bandwidth includes 69 direct current subcarriers.
7 . A communication method, applied for a station (STA), the method comprising:
communicating a physical protocol data unit (PPDU), with an access point (AP) using a transmission bandwidth which is used for the AP communicating with one or more stations (STAs);
wherein the 320 MHz transmission bandwidth comprises 12 left-sideband subcarriers and 11 right-sideband subcarriers, and wherein four 996-subcarrier resource units (RUs) exist between the 12 left-sideband subcarriers and the 11 right-sideband subcarriers, and the four 996-RUs are located in [−2036: −1539 −1533: −1036], [−1035: −538−532: −35], [35: 532 538: 1035] and [1036: 1533 1539: 2036], and null subcarriers of each 996-subcarrier RU are located in [−1538: −1534], [−537: −533], [533: 537], and [1534: 1538], and one 52-subcarrier RU located in [−34: −9 9: 34] and direct current subcarriers are included between a second 996-subcarrier RU and a third 996-subcarrier RU;
wherein the transmission bandwidth is 320 MHz including four independent 80 MHz transmission bandwidths, and the 320 MHz transmission bandwidth comprises 4096 subcarriers; and
wherein the PPDU carries indication information indicating whether the 52-subcarrier RU located is used;
wherein the PPDU further indicates M channel estimation subcarriers, which are comprised in a first extremely high throughput (EHT) signaling field of the PPDU, wherein M is determined by the AP based on a quantity of subcarriers used in a second EHT signaling field of the PPDU and a quantity of channel estimation subcarriers provided by a legacy preamble of the PPDU and a binary phase shift keying (BPSK) symbol field of the PPDU within a range of a second bandwidth, and M is a positive integer; and
wherein the second bandwidth is 2 N times a first bandwidth, N is 0 or a positive integer, and the first bandwidth and the second bandwidth are part of the transmission bandwidth.
8 . The communication method according to claim 7 , wherein a sequence number range of the 12 left-sideband subcarriers is [−2048: −2037], and a sequence number range of the 11 right-sideband subcarriers is [2037: 2047].
9 . The communication method according to claim 7 ,
wherein a subcarrier sequence number range of a first RU in the four 996-subcarrier RUs is [−2036: −1539, −1533: −1036]; and a sequence number range of the null subcarrier of the first RU is [−1538: −1534].
10 . The communication method according to claim 7 , wherein a subcarrier sequence number range of a fourth RU in the four 996-subcarrier RUs is [1036: 1533, 1539: 2036]; and a sequence number range of the null subcarrier of the fourth RU is [1534: 1538].
11 . The communication method according to claim 7 , wherein the center of the 996 subcarriers comprise five null subcarriers.
12 . The communication method according to claim 7 , wherein a center of the transmission bandwidth includes 69 direct current subcarriers.
13 . An apparatus, comprising a processor, wherein the processor is configured to execute computer program instructions stored in a memory to cause the apparatus to perform:
determining, a transmission bandwidth, which is used for an access point (AP) communicating with one or more stations (STAs), wherein the transmission bandwidth is 320 MHz including four independent 80 MHz transmission bandwidths, and the 320 MHz transmission bandwidth comprises 4096 subcarriers;
wherein the 320 MHz transmission bandwidth comprises 12 left-sideband subcarriers and 11 right-sideband subcarriers, and wherein four 996-subcarrier resource units (RUs) exist between the 12 left-sideband subcarriers and the 11 right-sideband subcarriers, and the four 996-RUs are located in [−2036: −1539 −1533: −1036], [−1035: −538-532: −35], [35: 532 538: 1035] and [1036: 1533 1539: 2036], and null subcarriers of each 996-subcarrier RU are located in [−1538: −1534], [−537: −533], [533: 537], and [1534: 1538], and one 52-subcarrier RU located in [−34: −9 9: 34] and direct current subcarriers are included between a second 996-subcarrier RU and a third 996-subcarrier RU;
communicating a physical protocol data unit (PPDU), with the one or more stations (STAs) by using the transmission bandwidth, wherein the PPDU carries indication information indicating whether the 52-subcarrier RU located is used;
wherein the PPDU further indicates M channel estimation subcarriers, which are comprised in a first extremely high throughput (EHT) signaling field of the PPDU, wherein M is determined by the AP based on a quantity of subcarriers used in a second EHT signaling field of the PPDU and a quantity of channel estimation subcarriers provided by a legacy preamble of the PPDU and a binary phase shift keying (BPSK) symbol field of the PPDU within a range of a second bandwidth, and M is a positive integer; and
wherein the second bandwidth is 2 N times a first bandwidth, N is 0 or a positive integer, and the first bandwidth and the second bandwidth are part of the transmission bandwidth.
14 . The apparatus according to claim 13 , wherein a sequence number range of the 12 left-sideband subcarriers is [−2048: −2037], and a sequence number range of the 11 right-sideband subcarriers is [2037: 2047].
15 . The apparatus according to claim 13 , wherein a subcarrier sequence number range of a first RU in the four 996-subcarrier RUs is [−2036: −1539, −1533: −1036]; and a sequence number range of the null subcarrier of the first RU is [−1538: −1534].
16 . The apparatus according to claim 13 , wherein a subcarrier sequence number range of a fourth RU in the four 996-subcarrier RUs is [1036: 1533, 1539: 2036]; and a sequence number range of the null subcarrier of the fourth RU is [1534: 1538].
17 . The apparatus according to claim 13 , wherein the center of the 996 subcarriers comprise five null subcarriers.
18 . The apparatus according to claim 13 , wherein a center of the transmission bandwidth includes 69 direct current subcarriers.