| 摘要 |
A method for controlling random accesses of user equipments (UEs) in a mobile communication system. The mobile communication system includes Node-Bs for performing radio communication with the UEs located in a number of cells, a radio network controller (RNC) for controlling the Node-Bs and a service node for connecting the RNC to a core network (CN), and transmits broadcast/multicast service data from the CN to the UEs through the RNC. The service node provides information indicating the number of UEs associated with group signaling to the RNC that controls packet data service for the UEs. When the UEs respond to the group signaling, the RNC refers to the number of UEs associated with the group signaling located in a specific cell, calculates a back-off window value indicating a back-off range necessary for controlling the random accesses of the UEs, contains the calculated back-off window value in a group signaling message, and transmits the group signaling message to the UEs. The UEs randomly select a back-off value within a range based upon the back-off window value in response to the group signaling message, respectively. The UEs wait for a time period corresponding to the randomly selected back-off value, and transmit a response message to the group signaling message to the RNC through a random access channel (RACH), respectively. Therefore, collision and congestion of radio messages due to simultaneous radio accesses of a plurality of UEs can be mitigated. |
