Patent ID: 7260081
Filing Date: 2007-08-21
Classification: H04L

Abstract:
1. A method for resolving collisions in a base station of a communication system using medium access control based on contention, comprising: at said base station: (a) initializing a contention window size and a status value; (b) broadcasting information on a total number of mini slots and a contention window size to each terminal; (c) receiving corresponding mini slot in response to access attempt of any terminal or terminals for resource allocation; (d) determining whether each terminal has experienced a collision, from the information on the mini slots received in (c); (e) setting the contention window size and the status value based on whether the contention window size is “0” or not when it is determined in (d) that any one or more terminals have experienced a collision; and (f) setting the contention window size and the status value in response to a decrease in a number of terminals competing for access in the case that the corresponding mini slot has been successfully received and for setting the contention window size and the status value so as to permit an access attempt by another terminal or terminals in the case that the corresponding mini slot has been received with unused state and the contention window size is smaller than or equal to “0” when a collision has not occurred in (d).