Patent ID: 7869380
Filing Date: 2011-01-11
Classification: G01S,H04L,H04W

Abstract:
1. A method of channel assessment in a coordinator of a wireless network in which a high rate physical channel and a low rate physical channel are used for communication, the method comprising: broadcasting a first information element to request assessment of a channel which is currently used in the wireless network; receiving a response to the request of the channel assessment from at least one user device of the wireless network, the response confirming that the channel assessment will be performed by the at least one user device which has decided to perform the channel assessment; broadcasting a beacon on the low rate physical channel after receiving the response confirming that the channel assessment will be performed, the beacon comprising information for allocating a channel time block which is a time interval during which the channel assessment is to be performed, wherein data transmission by all user devices in the wireless network is not allowed during the channel time block; and receiving a result of the channel assessment from the at least one user device, wherein the channel assessment is performed during the channel time block.