Patent ID: 7885287
Filing Date: 2011-02-08
Classification: H04W

Abstract:
1. A method comprising: receiving by a first network node a request-to-send (RTS) frame over a medium, the RTS frame being received with a first signal strength and including first duration information and a first basic service set identifier (BSSID); determining, by the first network node, the first BSSID is different than a second BSSID with which the first network node is associated; determining, by the first network node, the first signal strength is greater than a threshold value based at least in part on said determining that the first BSSID is different than the second BSSID; updating, by the first network node, a network allocation vector from a first state to a second state based at least in part upon said first duration information and determining that the first signal strength is greater than the threshold value; restoring the network allocation vector to the first state based at least in part on a determination that a clear-to-send (CTS) frame was not received within a predetermined time period from receipt of the RTS frame; receiving by the first network node another RTS frame over the medium, the another RTS frame having second duration information and a second signal strength; comparing the second signal strength to the threshold value; updating the network allocation vector with the second duration information based at least in part on a determination that the second signal strength is greater than the threshold value; determining another CTS frame, responsive to the another RTS frame, is received with a signal strength less than the threshold value; and ignoring third duration information included in the another CTS frame based at least in part on said determining the received signal strength of the another CTS frame is less than the threshold value.