METHODS FOR CONTROLLING RANDOM ACCESS TO PREVENT COLLISION BETWEEN UPLINK MESSAGES IN A MOBILE COMMUNICATION SYSTEM

摘要

A method for controlling random accesses of UEs in a mobile communication system. The mobile communication system includes Node-Bs, a RNC and a service node which provides information indicating the number of UEs associated with group signaling to the RNC. When the UEs respond to the group signaling, the RNC refers to the number of UEs, calculates a back-off window value indicating a back-off range necessary for controlling the random accesses of the UEs, contains the calculated value in a group signaling message, and transmits the message to the UEs. The UEs randomly select a back-off value within a range based upon the back-off window value and wait for a time period corresponding to the value, and transmit a response message, respectively. Therefore, collision and congestion of radio messages can be mitigated.