Method and device for accessing channel

A method for accessing a channel, comprising:

• modulating, by a first transmitting end device, a contention request frame onto M sub-carriers, wherein the M sub-carriers have at least two non-consecutive sub-carriers;
• transmitting, by the first transmitting end device, the contention request frame to a receiving end device on the M sub-carriers, to enable the receiving end device to acquire channel state information about the first transmitting end device respectively on the M sub-carriers according to the contention request frame, to determine, according to the channel state information about the first transmitting end device respectively on the M sub-carriers, channel state information about the first transmitting end device respectively on N sub-carriers, wherein the N sub-carriers are obtained by dividing all or a part of a system available frequency band, wherein the N sub-carriers comprise the M sub-carriers, wherein both N and M are positive integers, and wherein N is greater than M and M is greater than 1, and to perform allocation of a transmission sub-channel according to the channel state information about the first transmitting end device respectively on the N sub-carriers.

A receiving end device, comprising:

• a first receiver, configured to receive a contention request frame transmitted by a first transmitting end device on M sub-carriers, wherein the M sub-carriers have at least two non-consecutive sub-carriers, and the contention request frame is modulated by the first transmitting end device onto the M sub-carriers;
• a first processor, configured to acquire, according to the contention request frame received by the first receiver, channel state information about the first transmitting end device respectively on the M sub-carriers, and configured to determine, according to the channel state information about the first transmitting end device respectively on the M sub-carriers acquired by the acquiring unit, channel state information about the first transmitting end device respectively on N sub-carriers, wherein the N sub-carriers are obtained by dividing all or a part of a system available frequency band, wherein the N sub-carriers comprise the M sub-carriers, wherein both N and M are positive integers, and wherein N is greater than M and M is greater than 1, and configured to perform allocation of a transmission sub-channel according to the channel state information about the first transmitting end device respectively on the N sub-carriers.

A transmitting end device, comprising:

• a first processor, configured to modulate a contention request frame onto M sub-carriers, wherein the M sub-carriers have at least two non-consecutive sub-carriers;
• a first transmitter, configured to transmit the contention request frame modulated by the second processor to a receiving end device on the M sub-carriers, to enable the receiving end device to acquire channel state information about the first transmitting end device respectively on the M sub-carriers according to the contention request frame, to determine, according to the channel state information about the first transmitting end device respectively on the M sub-carriers, channel state information about the first transmitting end device respectively on N sub-carriers, wherein the N sub-carriers are obtained by dividing all or a part of a system available frequency band, wherein the N sub-carriers comprise the M sub-carriers, wherein both N and M are positive integers, and wherein N is greater than M and M is greater than 1, and to perform allocation of a transmission sub-channel according to the channel state information about the first transmitting end device respectively on the N sub-carriers.