Channel access method for multi-link device and related apparatus
This application relates to the field of wireless communication, for example, being applied to a wireless local area network supporting the 802.11be standard, and in particular, relates to a channel access method for a multi-link device and a related apparatus. The method includes: when a length of a first PPDU transmitted on a first link by a first multi-link device is less than or equal to a first value, skipping starting, by the first multi-link device, a medium synchronization delay timer on a second link, where the first multi-link device is not allowed to perform simultaneous transmitting and receiving on the first link and the second link.
1 . A method for a first multi-link device, the method comprising:
when a length of a first physical layer protocol data unit (PPDU) transmitted on a first link by the first multi-link device is less than or equal to a first threshold, skipping starting, by the first multi-link device, a medium synchronization delay timer on a second link, wherein the first multi-link device is not capable of performing simultaneous transmitting and receiving on the first link and the second link; and
wherein skipping starting, by the first multi-link device, the medium synchronization delay timer on the second link comprises:
setting an energy detection threshold that is used by clear channel assessment (CCA) performed on the second link to a second threshold, wherein the second threshold is −62 dBm.
2 . The method according to claim 1 , further comprising:
receiving, by the first multi-link device, the first threshold, wherein the first threshold is carried in a beacon frame, an association response frame, or a reassociation response frame.
3 . The method according to claim 1 , further comprising:
when the length of the first PPDU is greater than the first threshold, determining, by the first multi-link device, an initial value that is of the medium synchronization delay timer and that corresponds to the length of the first PPDU, and starting the medium synchronization delay timer with the initial value on the second link.
4 . The method according to claim 3 , further comprising:
receiving, by the first multi-link device, first indication information, wherein the first indication information indicates a mapping relationship between one or more PPDU lengths and one or more initial values of the medium synchronization delay timer.
5 . A first multi-link device, comprising:
a processor; and
a memory storing a computer program, wherein the processor is configured to execute the computer program stored in the memory, and executing the computer program stored in the memory enables the first multi-link device to perform:
when a length of a first physical layer protocol data unit (PPDU) transmitted on a first link by the first multi-link device is less than or equal to a first threshold, skipping starting a medium synchronization delay timer on a second link, wherein the first multi-link device is not capable of performing simultaneous transmitting and receiving on the first link and the second link; and
wherein skipping starting the medium synchronization delay timer on the second link comprises:
setting an energy detection threshold that is used by clear channel assessment (CCA) performed on the second link to a second threshold, wherein the second threshold is −62 dBm.
6 . The first multi-link device according to claim 5 , wherein executing the computer program stored in the memory further enables the first multi-link device to perform:
receiving the first threshold, wherein the first threshold is carried in a beacon frame, an association response frame, or a reassociation response frame.
7 . The first multi-link device according to claim 5 , wherein executing the computer program stored in the memory further enables the first multi-link device to perform:
when the length of the first PPDU is greater than the first threshold, determining an initial value that is of the medium synchronization delay timer and that corresponds to the length of the first PPDU, and starting the medium synchronization delay timer with the initial value on the second link.
8 . The first multi-link device according to claim 7 , wherein executing the computer program stored in the memory further enables the first multi-link device to perform:
receiving first indication information, wherein the first indication information indicates a mapping relationship between one or more PPDU lengths and one or more initial values of the medium synchronization delay timer.
9 . A first multi-link device, comprising:
an input/output interface; and
a processing circuit;
wherein the input/output interface is configured to receive code instructions and transmit the code instructions to the processing circuit; and
wherein the processing circuit is configured to:
when a length of a first physical layer protocol data unit (PPDU) transmitted on a first link is less than or equal to a first threshold, skip starting a medium synchronization delay timer on a second link, wherein the first multi-link device is not capable of performing simultaneous transmitting and receiving on the first link and the second link; and
wherein skipping starting the medium synchronization delay timer on the second link comprises:
setting an energy detection threshold that is used by clear channel assessment (CCA) performed on the second link to a second threshold, wherein the second threshold is −62 dBm.
10 . The first multi-link device according to claim 9 , wherein the input/output interface is further configured to receive the first threshold, and the first threshold is carried in a beacon frame, an association response frame, or a reassociation response frame.
11 . The first multi-link device according to claim 9 , wherein the processing circuit is further configured to:
when the length of the first PPDU is greater than the first threshold, determine an initial value that is of the medium synchronization delay timer and that corresponds to the length of the first PPDU, and start the medium synchronization delay timer with the initial value on the second link.
12 . The first multi-link device according to claim 11 , wherein the input/output interface is further configured to:
receive first indication information, wherein the first indication information indicates a mapping relationship between one or more PPDU lengths and one or more initial values of the medium synchronization delay timer.
13 . The first multi-link device according to claim 5 , wherein executing the computer program stored in the memory further enables the first multi-link device to perform:
receiving the first threshold, wherein the first threshold is carried in an association response frame.
14 . The first multi-link device according to claim 5 , wherein executing the computer program stored in the memory further enables the first multi-link device to perform:
receiving the first threshold, wherein the first threshold is carried in a reassociation response frame.
15 . The method according to claim 1 , further comprising:
receiving, by the first multi-link device, the first threshold, wherein the first threshold is carried in an association response frame.
16 . The method according to claim 1 , further comprising:
receiving, by the first multi-link device, the first threshold, wherein the first threshold is carried in a reassociation response frame.
17 . The first multi-link device according to claim 9 , wherein the input/output interface is further configured to receive the first threshold, and the first threshold is carried in an association response frame.
18 . The first multi-link device according to claim 9 , wherein the input/output interface is further configured to receive the first threshold, and the first threshold is carried in a reassociation response frame.