Patent ID: 11917565
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 5:
6. The method according to claim 1, further comprising:
sending, by the first communications device when the channel is idle, a physical layer legacy preamble (L-Preamble) to the plurality of woken-up second communications devices, wherein the L-Preamble carries first indication information and all or a portion of bits of a check code field of a wake-up frame that is received by wake-up receivers of the plurality of woken-up second communications devices to wake up main transceivers of the plurality of woken-up second communications devices,
wherein the first indication information is used to indicate, to the plurality of woken-up second communications devices, that the L-Preamble is a synchronization frame,
wherein the all or the portion of the bits of the check code field are used to indicate identifiers of the plurality of woken-up second communications devices, and
wherein the L-Preamble is used to instruct the plurality of woken-up second communications devices to wait a second preset duration to perform a backoff procedure to contend for access to the channel after receiving the L-Preamble.