Data communications method using backoff number control

Details Data communications method using backoff number control Data communications method using backoff number control

2002-09-20

2008-09-23

Backer, Firmin (Department: 2616)

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

C370S329000, C370S445000

Reexamination Certificate

active

07428240

ABSTRACT:
A method for transmitting data in a centralized data communications system having an access point and a plurality of stations using a carrier sense multiplexing access (CSMA) method using a backoff number control preferably includes (a) receiving a multi-poll message containing backoff numbers to be assigned to each station by the access point; (b) setting the backoff numbers of the multi-poll message to the backoff numbers of the stations; and (c) counting down the set backoff numbers and transmitting data. Each station that desires polling registers a station ID and a polling cycle, sets a backoff number contained in a multi-poll message, counts the backoff number, and if the backoff number becomes zero, transmits data such that contention between stations is prevented.

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