System and method for coordinated beamforming for overlapping basic service set in WLAN
First Claim
1. A method by a first access point (AP) enabling coordinated beamforming (CB) for overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the method comprising:
- sending by the first AP a Feedback Request (FBR) frame to each one of a plurality of stations (STAs), wherein the OBSSs comprise the STAs and a plurality of APs including the first AP and other APs;
receiving a feedback frame from each STA of the STAs that participate in CB transmission for the OBSSs, wherein the feedback frame includes channel state information (CSI) of the STA, and wherein at least one of the STAs that participate in the CB transmission for the OBSSs is associated with one of the other APs and not with the first AP, the CSI enabling the first AP to perform CB on downlink;
sending an initiate CB frame to each one of the other APs in the OBSSs;
receiving an acknowledgement (ACK) frame from each one of the other APs intending to participate in the CB transmission;
starting the CB transmission with each one of the other APs that participate in the CB transmission; and
sending an end of service period (EOSP) frame terminating the CB transmission.
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Accused Products
Abstract
Embodiments are provided for enabling a coordinated beamforming (CB) mechanism in WLAN scenarios. In an embodiment, an AP sends a Feedback Request (FBR) frame to each one of the STAs in the OBSSs. The OBSSs comprise the STAs and a plurality of APs including the AP. The AP then receives a feedback frame from each STA of the STAs that participate in the CB transmission. The feedback frame includes channel state information (CSI) of the STA. The CSI enables the sending AP of performing CB on downlink. In an embodiment, the AP receives an initiate CB frame from a second AP initiating a CB transmission, and then sends an ACK frame to the second AP before sending the FBR frame to each one of the STAs. The AP starts the CB transmission with each one of the other APs that participate in the CB transmission.
24 Citations
22 Claims
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1. A method by a first access point (AP) enabling coordinated beamforming (CB) for overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the method comprising:
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sending by the first AP a Feedback Request (FBR) frame to each one of a plurality of stations (STAs), wherein the OBSSs comprise the STAs and a plurality of APs including the first AP and other APs; receiving a feedback frame from each STA of the STAs that participate in CB transmission for the OBSSs, wherein the feedback frame includes channel state information (CSI) of the STA, and wherein at least one of the STAs that participate in the CB transmission for the OBSSs is associated with one of the other APs and not with the first AP, the CSI enabling the first AP to perform CB on downlink; sending an initiate CB frame to each one of the other APs in the OBSSs; receiving an acknowledgement (ACK) frame from each one of the other APs intending to participate in the CB transmission; starting the CB transmission with each one of the other APs that participate in the CB transmission; and sending an end of service period (EOSP) frame terminating the CB transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A first access point (AP) enabling coordinated beamforming (CB) for overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the first AP comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; send a Feedback Request (FBR) frame to each one of a plurality of statins (STAs), wherein the OBSSs comprise the STAs and a plurality of APs including the first AP and other APs; receive a feedback frame from each STA of the STAs that participate in CB transmission for the OBSSs, wherein the feedback frame includes channel state information (CSI) of the STA, and wherein at least one of the STAs that participate in the CB transmission for the OBSSs is associated with one of the other APs and not with the first AP, the CSI enabling the first AP to perform CB on downlink; send an initiate CB frame to each one of the other APs in the OBSSs; receive an acknowledgement (ACK) frame from each one of the other APs that participate in the CB transmission; start the CB transmission with each one of the other APs that participate in the CB transmission; and send, to the other APs participating in the CB transmission, an end of service period (EOSP) frame terminating the CB transmission. - View Dependent Claims (11, 12)
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13. A method by a first access point (AP) enabling coordinated beamforming (CB) for overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the method comprising:
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receiving by the first AP an initiate CB frame from a second AP initiating CB transmission for OBSSs, wherein the OBSSs comprise a plurality of APs and a plurality of stations (STAs) associated with the APs, and wherein the plurality of APs includes the first AP, the second AP and other APs; sending an acknowledgement (ACK) frame to the second AP, wherein the first AP participates in the CB transmission with the second AP; sending a Feedback Request (FBR) frame to each one of the STAs; receiving a feedback frame from each STA of the STAs that participate in the CB transmission, wherein the feedback frame includes channel state information (CSI) of the STA, and wherein at least one of the STAs that participate in the CB transmission is associated with the second AP or one of the other APs, and not with the first AP, the CSI enabling the first AP to perform CB on downlink; starting the CB transmission with each one of the other APs participating in the CB transmission; and receiving, from the second AP, an end of service period (EOSP) frame terminating the CB transmission. - View Dependent Claims (14, 15)
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16. A first access point (AP) enabling coordinated beamforming (CB) for overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the first AP comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; receive an initiate CB frame from a second AP initiating in CB transmission for OBSSs, wherein the OBSSs comprise a plurality of APs and a plurality of stations (STAs) associated with the APs, and wherein the plurality of APs includes the first AP, the second AP and other APs; send an acknowledgement (ACK) frame to the second AP, wherein the first AP participates in the CB transmission with the second AP; send a Feedback Request (FBR) frame to each one of the STAs; receive a feedback frame from each STA of the STAs that participate in the CB transmission, wherein the feedback frame includes channel state information (CSI) of the STA, and wherein at least one of the STAs that participate in the CB transmission is associated with the second AP or one of the other APs, and not with the first AP, the CSI enabling the first AP to perform CB on downlink; start the CB transmission with each one of the other APs participating in the CB transmission; and receive, from the second AP, an end of service period (EOSP) frame terminating the CB transmission. - View Dependent Claims (17)
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18. A method by a station (STA) in overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the method comprising:
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receiving from a first access point (AP) a Feedback Request (FBR) frame, wherein the OBSSs comprise a plurality of APs including the first AP and other APs, and further comprise a plurality of stations (STAs) including the STA; sending a feedback frame to the first AP, wherein the STA participates in a coordinated beamforming (CB) transmission with the first AP, wherein the STA is associated with one of the other APs and not with the first AP, and wherein the feedback frame includes channel state information (CSI) of the STA, the CSI enabling the first AP to perform CB on downlink; starting the CB transmission with the first AP and each one of the other APs participating in the CB transmission, after the first AP sends an initiate CB frame to each one of the other APs in the OBSSs, and after each one of the other APs intending to participate in the CB transmission sends an acknowledgement (ACK) frame; and ending the CB transmission after the first AP sends an end of service period (EOSP) frame. - View Dependent Claims (19, 20)
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21. A station (STA) in overlapping basic service sets (OBSSs) in wireless local area network (WLAN), the STA comprising:
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a processor; and a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to; receive from a first access point (AP) a Feedback Request (FBR) frame, wherein the OBSSs comprise a plurality of APs including the first AP and other APs, and further comprise a plurality of stations (STAs) including the STA; send a feedback frame to the first AP, wherein the STA participates in a coordinated beamforming (CB) transmission with the first AP, wherein the STA is associated with one of the other APs and not with the first AP, and wherein the feedback frame includes channel state information (CSI) of the STA, the CSI enabling the first AP to perform CB on downlink; start the CB transmission with the first AP and each one of the other APs participating in the CB transmission, after the first AP sends an initiate CB frame to each one of the other APs in the OBSSs, and after each one of the other APs intending to participate in the CB transmission sends an acknowledgement (ACK) frame; and end the CB transmission after the first AP sends an end of service period (EOSP) frame. - View Dependent Claims (22)
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Specification