Method and apparatus for medium access control for uniform multiple access points coverage in wireless local area networks
A method and apparatus may be used in multi-AP and multi-wireless transmit/receive unit joint transmissions. The apparatus may be configured to transmit a joint transmission request on a first medium, and receive a joint transmission response on the first medium. In response, the apparatus my perform a joint transmission negotiation on a second medium and transmit data on the second medium based on the joint transmission negotiation. The apparatus may be configured to perform coordinated sectorized or beamformed transmissions through access point (AP)/PCP negotiations. The apparatus may provide an indication of support for joint transmission and coordinated sectorized or beamformed transmissions. The method and apparatus may also implement multi-AP/WTRU request-to-send (RTS)/clear-to-send (CTS) procedures. The apparatus may be configured to perform coordinated sectorized or beamforming grouping.
1. A method performed by a station (STA), the method comprising:
monitoring beamforming mode information in one or more frames received from an overlapping basic service set (OBSS);
sending the beamforming mode information to an access point (AP) with which the STA is associated to enable coordinated transmit beamforming with the OBSS;
receiving, from the AP, based on the coordinated transmit beamforming with the OBSS, a sectorized beacon frame that includes a scheduling of sectorized transmission in at least one sector associated with the STA; and
transmitting, to the AP, a data packet according to the scheduling of sectorized transmission in the sectorized beacon frame.
2. The method of claim 1 , wherein the beamforming mode information comprises a transmitter address, a receiver address, an OBSS ID, an indication of frame beamforming, a sector ID, or directional reception mode information.
3. The method of claim 2 , wherein directional reception mode information comprises a current directional reception mode or beamforming weights of an intended recipient STA of a monitored frame.
4. The method of claim 1 , wherein the beamforming mode information is sent to the AP in a sectorized reception report frame.
5. The method of claim 4 , wherein the sectorized reception report frame includes an ID of a transmitter of the frame, an ID of an intended recipient of the frame, a transmission mode of the transmitter of the frame, directional mode information of the transmitter of the frame, time information of the one or more received frames, or a measured characteristic of the frame.
6. The method of claim 5 , wherein the directional mode information comprises beamforming weights, an ID of a sector of receive beamforming, or an ID of an Rx sector of the intended recipient STA of the frame.
7. The method of claim 4 , wherein the sectorized reception report frame includes information regarding detected interference of an OBSS AP transmission or non-AP STA transmission.
8. The method of claim 1 ,
wherein the scheduling of sectorized transmission relates to a coordinated beamforming schedule based, at least in part, on the beamforming mode information sent by the STA.
9. An access point (AP) comprising:
a processor; and a transceiver in communication with the processor, wherein the transceiver and processor are configured to:
receive one or more sectorized reception report frames from one or more STAs associated with the AP, the sectorized reception report frame indicating interference monitored by the one or more STAs of frames received from an overlapping basic service set (OBSS); and
combine information in the received one or more sectorized reception report frames with OBSS interference monitored by the AP, to determine a beamforming transmission sector conflict list;
send, to a STA associated with the AP, a sectorized beacon frame that includes a scheduling of sectorized transmission in at least one sector associated with the STA, wherein the schedule of sectorized transmission is based, at least in part, on the determined beamforming transmission sector conflict list; and
receive, from the STA, a data packet according to the scheduling of sectorized transmission in the sectorized beacon frame.
10. The AP of claim 9 , wherein the transceiver and processor are further configured to:
send the beamforming transmission sector conflict list to a coordinating AP; and
receive a coordinated sectorized beamforming schedule from the coordinating AP.
11. The AP of claim 9 , wherein the transceiver and processor are further configured to:
receive additional beamforming transmission sector conflict lists from one or more neighboring APs; and
determine a coordinated sectorized beamforming schedule based on information in determined or received beamforming transmission sector conflict lists; and
send the coordinated sectorized beamforming schedule to the one or more neighboring APs.
12. The AP of claim 11 , wherein the transceiver and processor are further configured to:
transmit frames to, or receive frames from, the one or more STAs associated with the AP based on the coordinated sectorized beamforming schedule.
13. The AP of claim 9 , wherein the one or more sectorized reception report frames includes an ID of a transmitter an OBSS frame, an ID of an intended receiver of the OBSS frame, a transmission mode or directional mode information of the transmitter, or a measured characteristic of the OBSS frame.