Channel sounding method in wireless LAN system and device for supporting same
AssigneeElectronics and Telecommunications Research Institute
InventorsMin ho Cheong, Hyoung Jin Kwon, Jae Seung Lee, Sok Kyu Lee
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Abstract
A method for channel sounding in a wireless local area network (WLAN) system and apparatus for the same is disclosed. An access point (AP) to perform the method for channel sounding broadcasts information on a restricted access window (RAW) for channel sounding included in a beacon, and transmits null data packets (NDP) for channel estimation in the RAW to a station (STA). The STA estimates channel information based on the NDPs, and transmits the estimated channel information to the AP.
Claims18
A method for channel sounding in a wireless local area network (WLAN) system performed by an access point (AP), the method comprising:
- broadcasting a beacon comprising information on a sub-channel selective transmission (SST) sounding restricted access window (RAW) for channel sounding;
- transmitting a plurality of null data packet (NDP) frames for a plurality of channels in the SST sounding RAW for the channel sounding to a station (STA);
- and
- receiving, from the STA, a report frame including information on at least one channel selected by the STA based on the NDP frames,
- wherein the SST sounding RAW is allocated to the STA only for the channel sounding,
- wherein the AP controls the data transmission by the STA to be prohibited over the SST sounding RAW duration for the channel sounding,
- wherein the NDP frames for the plurality of channels are used in sub-channel selective transmission (SST) in the SST sounding RAW duration for the channel sounding, and
- wherein each of the NDP frames indicates channel allocated to each of the NDP frames.
A method for channel sounding in a wireless local area network (WLAN) system performed by a station (STA), the method comprising:
- receiving, from an access point (AP), a beacon comprising information on a sub-channel selective transmission (SST) sounding restricted access window (RAW) for channel sounding;
- receiving, from the AP, a plurality of null data packet (NDP) frame for a plurality of channels in the SST sounding RAW for the channel sounding;
- estimating channel information based on the NDP frames received from the AP;
- selecting at least one channel based on the estimated channel information;
- and
- transmitting a report frame including information on the at least one channel to the AP,
- wherein the NDP frames are transmitted to the STA in the SST sounding RAW,
- wherein the SST sounding RAW is allocated to the STA only for the channel sounding,
- wherein the AP controls the data transmission by the STA to be prohibited over the SST sounding RAW duration for the channel sounding,
- wherein the NDP frames for the plurality of channels are used in sub-channel selective transmission (SST) in the SST sounding RAW duration for the channel sounding, and
- wherein each of the NDP frames indicates channel allocated to each of the NDP frames.
A wireless apparatus comprising:
- a transceiver to transmit and receive a frame;
- and
- a processor functionally associated with the transceiver,
- wherein the processor is configured to:
- control the transceiver to receive a beacon comprising information on a sub-channel selective transmission (SST) sounding restricted access window (RAW) for channel sounding from an access point (AP),
- control the transceiver to receive a plurality of null data packet (NDP) frames for a plurality of channels in the SST sounding RAW for the channel sounding from the AP,
- estimate channel information based on the NDP frames received from the AP,
- select at least one channel based on the estimated channel information, and
- transmit a report frame including information on the at least one channel to the AP,
- wherein the NDP frames are transmitted to a station (STA) in the SST sounding RAW,
- wherein the SST sounding RAW is allocated to the STA only for the channel sounding, and
- wherein the AP controls the data transmission by the STA to be prohibited over the SST sounding RAW duration for the channel sounding,
- wherein the NDP frames for the plurality of channels are used in sub-channel selective transmission (SST) in the SST sounding RAW duration for the channel sounding, and
- wherein each of the NDP frames indicates channel allocated to each of the NDP frames.
Dependencies are inferred from the claim text.