Patent ID: 8351951

Claim:
A method of controlling channel access for a mobile device in a wireless communication system, the method comprising: receiving a dynamic persistence level from the wireless communication system; determining a first persistence value according to the dynamic persistence level and at least one persistence coefficient stored in the mobile device; comparing the first persistence value with a first random number; according to a first comparison result generated by the step of comparing the first persistence value with the first random number, determining whether a first channel is permitted to be accessed for sending a message from the mobile device to the wireless communication system; determining a constant value as a second persistence value when the first comparison result indicates that the first channel is not permitted to be accessed; and determining whether the first channel is permitted to be accessed according to a second comparison result generated by comparing the second persistence value with the first random number or with a second random number, wherein the constant value is larger than the first random number and the second random number, and wherein the first persistence value and the second persistence value correspond to the same access service class (ASC).