Patent ID: 8032170

Claim:
A method for addressing a broadcast message in a trunk system, the trunk communication system including a base station and one or more mobile stations, the method comprising: adding a new trunk broadcast time slot; monitoring trunk broadcast time slots by all mobile stations that support group call service; transmitting a paging message of the group call by said base station in the trunk broadcast time slot, wherein the paging message uses group identification as a broadcast address, and addresses according to the group identification; sending to the base station system by a dispatching server a user property update message carrying the user property information that needs to be modified and a modified user identification, the message carrying information about the identification of the group where the mobile station is; constructing and sending by the base station system to each mobile station the user property update message of an air interface; performing by the mobile station the operations of adding, modifying, deleting and synchronizing according to the requirements in the user property update message; returning from the mobile station a user property update answer message carrying the update results to the base station system; constructing and sending by the base station system a use a user property update answer message of an interface to the dispatching server; determining by the dispatching server whether the user property update is successful; continuing the call process if the mobile station is in a call service state before updating the user property; and releasing the present call if the mobile station is in an idle state before updating the user property, then the present call is released.