Avoiding hidden terminals in wireless local area networks

Details Avoiding hidden terminals in wireless local area networks Avoiding hidden terminals in wireless local area networks

2006-06-08

2010-02-02

Ngo, Ricky (Department: 2416)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C370S329000, C370S310200, C370S336000, C370S474000

Reexamination Certificate

active

07656854

ABSTRACT:
A method, apparatus and computer program product for preventing occurrences of the hidden node problem are presented. A transmission request (CC-RTS) is received from a source node, the CC-RTS frame including a reservation duration value indicating the length of time needed for a transmission reservation. A timer is adjusted for the period other nodes must refrain from transmitting on the channel (NAV) equal to a duration of a transmission request/transmission response (CC-RTS/CC-CTS) handshake. When the CC-RTS has been denied, then a second CC-RTS frame is received having a reservation duration value of zero, and when the CC-RTS is accepted then the NAV is extended to remainder of the reservation duration value of the original CC-RTS frame. The CC-RTS and CC-CTS are sent at a more robust PHY mode than traffic frames.

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