Avoiding exposed node problems in wireless local area networks

Details Avoiding exposed node problems in wireless local area networks Avoiding exposed node problems in wireless local area networks

2006-06-08

2009-11-10

Ngo, Ricky (Department: 2416)

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

C370S322000, C370S348000, C370S443000, C370S445000

Reexamination Certificate

active

07616655

ABSTRACT:
A method, apparatus and computer program product for avoiding exposed nodes in Wireless local Area Networks is presented. The method includes maintaining at a node a first timer (NAV_RTS) for a channel which, if set, prevents the node from authorizing a transmission on the channel to itself and maintaining at the node a second timer (NAV_CTS) for the channel which, if set, prevents the node from transmitting on the channel. The method further includes updating the NAV_RTS when a transmission request (CC-RTS) frame is received having a reservation duration value greater than zero and greater than a current value of the NAV_RTS, and updating the NAV_CTS when a transmission response (CC-CTS) frame is received having a reservation duration value greater than zero and greater than a current value of the NAV_CTS.

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International Search Report, pp. 1-8.

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