Method for indicating spatial reuse parameter and determining spatial reuse parameter field and apparatus
This application relates to the wireless communication field, and is applied to a wireless local area network that supports the 802.11be standard. In particular, this application relates to a method including: An access point AP sends a trigger frame, where the trigger frame is used for triggering a station to send an extremely high throughput trigger based physical layer protocol data unit EHT TB PPDU. The station determines, based on one or two of a value indicated by an uplink EHT spatial reuse parameter UL EHT SRP and a value indicated by one or more uplink spatial reuse parameter UL SRP fields in a common information field of the trigger frame, a value indicated by a spatial reuse parameter SRP in a universal signal field U-SIG of the EHT TB PPDU. The STA sends the EHT TB PPDU to the AP.
1. A trigger frame transmission method, comprising:
sending, by an access point (AP), a trigger frame for triggering a station to send an extremely high throughput trigger based physical layer protocol data unit (EHT TB PPDU), wherein the trigger frame comprises a universal signal field (U-SIG) reserved indication field indicating a value of a U-SIG reserved field in the EHT TB PPDU; and
receiving, by the AP, the EHT TB PPDU sent by the station in response to the trigger frame, wherein the value of the U-SIG reserved field in a U-SIG of the EHT TB PPDU is determined based on a value of the U-SIG reserved indication field in the trigger frame,
wherein a common information field of the trigger frame comprises four uplink spatial reuse parameter (UL SRP) field.
2. The method according to claim 1 , wherein the U-SIG reserved indication field is located in a special user information field in a user information list field of the trigger frame.
3. The method according to claim 2 , wherein an association identifier ALD12 of the special user information field is a preset value or an incomplete AID12 value.
4. The method according to claim 2 , wherein the special user information field further comprises two uplink EHT spatial reuse parameter (UL EHT SRP) fields, and a value indicated by a spatial reuse parameter (SRP) in the U-SIG of the EHT TB PPDU is determined based on the two UL EHT SRP fields.
5. The method according to claim 1 , wherein
the U-SIG comprises an SRP1 field and an SRP2 field;
a value of the SRP1 field in the U-SIG is equal to any value of a UL SR1 field and a UL SR2 field in four spatial reuse fields indicated by an uplink spatial reuse field of the trigger frame; and
a value of an SRP2 field in the U-SIG is equal to any one of a UL SR3 field and a UL SR4 field in the four spatial reuse fields indicated by the uplink spatial reuse field of the trigger frame.
6. The method according to claim 1 , wherein a high efficiency/extremely high throughput (HE/EHT) subfield indicating an EHT station to send a high efficiency trigger based physical layer protocol data unit (HE TB PPDU) or an EHT TB PPDU is set in a reserved field in the common information field of the trigger frame.
7. The method according to claim 1 , wherein the trigger frame further comprises:
an uplink (UL) EHT PPDU bandwidth (BW) extension field, configured together with a UL (HE) BW field to jointly indicate an uplink high efficiency (HE) bandwidth and an uplink EHT bandwidth; or
a special user presence indicator subfield, indicating whether a special user information field exists.
8. A communication apparatus in a wireless local area network WLAN, comprising:
a processor, configured to generate a trigger frame for triggering a station to send an extremely high throughput trigger based physical layer protocol data unit (EHT TB PPDU), wherein the trigger frame comprises a universal signal field (U-SIG) reserved indication field indicating a value of a U-SIG reserved field in the EHT TB PPDU; and
a transceiver, configured to
send the trigger frame, and
receive the EHT TB PPDU sent by the station in response to the trigger frame, wherein the value of the U-SIG reserved field in a U-SIG of the EHT TB PPDU is determined based on a value of the U-SIG reserved indication field in the trigger frame,
wherein a common information field of the trigger frame comprises four uplink spatial reuse parameter (UL SRP) field.
9. The communication apparatus according to claim 8 , wherein the U-SIG reserved indication field is located in a special user information field in a user information list field of the trigger frame.
10. The communication apparatus according to claim 9 , wherein an association identifier AID12 of the special user information field is a preset value or an incomplete AID12 value.
11. The communication apparatus according to claim 9 , wherein the special user information field further comprises two uplink EHT spatial reuse parameter (UL EHT SRP) fields, and a value indicated by a spatial reuse parameter (SRP) in the U-SIG of the EHT TB PPDU is determined based on the two UL EHT SRP fields.
12. The communication apparatus according to claim 8 , wherein
the U-SIG comprises an SRP1 field and an SRP2 field;
a value of the SRP1 field in the U-SIG is equal to any value of a UL SR1 field and a UL SR2 field in four spatial reuse fields indicated by an uplink spatial reuse field of the trigger frame; and
a value of an SRP2 field in the U-SIG is equal to any one of a UL SR3 field and a UL SR4 field in the four spatial reuse fields indicated by the uplink spatial reuse field of the trigger frame.
13. The communication apparatus according to claim 8 , wherein a high efficiency/extremely high throughput (HE/EHT) subfield indicating an EHT station to send a high efficiency trigger based physical layer protocol data unit (HE TB PPDU) or an EHT TB PPDU is set in a reserved field in the common information field of the trigger frame.
14. The communication apparatus according to claim 8 , wherein the trigger frame further comprises:
an uplink (UL) EHT PPDU bandwidth (BW) extension field, configured together with a UL (HE) BW field to jointly indicate an uplink high efficiency (HE) bandwidth and an uplink EHT bandwidth; or
a special user presence indicator subfield, indicating whether a special user information field exists.
15. A physical layer protocol data unit (PPDU) transmission method, comprising:
receiving, by a station, a trigger frame for triggering the station to send an extremely high throughput trigger based physical layer protocol data unit (EHT TB PPDU), wherein the trigger frame comprises a universal signal field (U-SIG) reserved indication field indicating a value of a U-SIG reserved field in the EHT TB PPDU; and
sending, by the station, the EHT TB PPDU in response to the trigger frame, wherein the value of the U-SIG reserved field in a U-SIG of the EHT TB PPDU is determined based on a value of the U-SIG reserved indication field in the trigger frame,
wherein a common information field of the trigger frame comprises four uplink spatial reuse Parameter (UL SRP) field.
16. The method according to claim 15 , wherein the U-SIG reserved indication field is located in a special user information field in a user information list field of the trigger frame.
17. The method according to claim 16 , wherein an association identifier AID12 of the special user information field is a preset value or an incomplete AID12 value.
18. The method according to claim 16 , wherein the special user information field further comprises one UL SRP field for the U-SIG or two UL SRP fields for the U-SIG.