Controlling transmissions from multiple user devices via a request-clear technique
A method of setup a protection mechanism for scheduled transmissions to multiple stations is introduced. Through transmitting a control frame addressing to multiple stations for immediate simultaneous responses, the transmitter would know the stations that are ready for receiving the scheduled data frames and schedule the packet for those stations. Combining the transmission of the control frame with the power saving mechanism would allow triggering a group of power saving stations to wake up at same for receiving the control frame and scheduled user data frames. A new mechanism of simultaneous group responses to the control frame with orthogonal identifier information for individual station is provided to uniquely identify the responding stations.
1. A method of operating a wireless device, comprising:
operating the wireless device in a first basic service set (BSS) in which wireless transmissions use a broadband wireless channel comprising multiple lower bandwidth channels, wherein each of the multiple lower bandwidth channels has a bandwidth that is lower than that of the broadband wireless channel; maintaining, at the wireless device, two or more network access vectors (NAVs), wherein each NAV corresponds to the first BSS, and wherein each NAV comprises a timer scheme for performing virtual carrier sensing on a corresponding lower bandwidth channel from the multiple lower bandwidth channels; receiving, from an access point of the first BSS, a control message for responding to the access point with a channel occupancy status message; checking one or more NAVs corresponding to one or more of the multiple lower bandwidth channels identified by the control message; and responding to the control message based on an indication of channel occupancy from the one or more NAVs.
2. The method of claim 1 , wherein the responding to the control message includes responding with a clear-to-send indication only when all of the one or more NAVs indicate that corresponding lower bandwidth channels are unoccupied.
3. The method of claim 1 , further including: maintaining, at the wireless device, another array of NAVs corresponding to a second BSS in which the wireless device is operating, and wherein the checking the one or more NAVs includes checking one or more other NAVs of the other array.
4. The method of claim 1 , wherein at least some of the multiple lower bandwidth channels have bandwidths different from each other.
5. The method of claim 1 , wherein the responding to the control message is performed over one of the multiple lower bandwidth channels that is not being used.
6. A wireless device, comprising: a memory storing instructions; and a processor reading the instructions from the memory and executing the instructions for operating the wireless device in a wireless network, the instructions comprising: instructions for operating the wireless device in a first basic service set (BSS) in which wireless transmissions use a broadband wireless channel comprising multiple lower bandwidth channels, wherein each of the multiple lower bandwidth channels has a bandwidth that is lower than that of the broadband wireless channel; instructions for maintaining, at the wireless device, two or more network access vectors (NAVs), wherein each NAV corresponds to the first BSS, and wherein each NAV comprises a timer scheme for performing virtual carrier sensing on a corresponding lower bandwidth channel from the multiple lower bandwidth channels; instructions for receiving, from an access point of the first BSS, a control message for responding to the access point with a channel occupancy status message; instructions for checking one or more NAVs corresponding to one or more of the multiple lower bandwidth channels identified by the control message; and instructions for responding to the control message based on an indication of channel occupancy from the one or more NAVs.
7. The wireless device of claim 6 , wherein the instructions for responding to the control message include instructions for responding with a clear-to-send indication only when all of the one or more NAVs indicate that corresponding lower bandwidth channels are unoccupied.
8. The wireless device of claim 6 , the instructions further including: instructions for maintaining, at the wireless device, another array of NAVs corresponding to a second BSS in which the wireless device is operating, and wherein the checking the one or more NAVs includes checking one or more other NAVs of the other array.
9. The wireless device of claim 6 , wherein at least some of the multiple lower bandwidth channels have bandwidths different from each other.
10. The wireless device of claim 6 , wherein the responding to the control message is performed over one of the multiple lower bandwidth channels that is not being used.