Patent ID: 7428240
Filing Date: 2008-09-23
Classification: H04L,H04W

Abstract:
1. A data transmission method using a backoff number control in a centralized data communications system, which includes an access point and a plurality of stations, comprising: (a) receiving a multi-poll message containing backoff numbers to be assigned to each station by the access point; (b) determining at each station if a station ID corresponding to that station is identified in the multi-poll message; (c) setting the backoff numbers of the stations to the corresponding backoff numbers assigned by the multi-poll message; (d) counting down the set backoff numbers before transmitting data from one of the plurality of stations; and (e) resetting the backoff number to a value obtained by adding the current number of stations identified in the multi-poll message to a randomly generated backoff number in a station that is not among the identified stations.