초록 ▼

A method for maintaining a group call in a mobile radio system, and a mobile station in a mobile radio system, wherein the geographical area covered by the system is divided into radio cells. Each radio cell includes a base station. A group call is established between the mobile stations belonging t

A method for maintaining a group call in a mobile radio system, and a mobile station in a mobile radio system, wherein the geographical area covered by the system is divided into radio cells. Each radio cell includes a base station. A group call is established between the mobile stations belonging to a group call group and residing within the areas of the radio cells forming a limited group call area. In order that the mobile station, upon changing radio cells, is able to select the base station within the area of which the group call is in progress, the respective base stations send one or a plurality of group call maintenance messages to the mobile stations involved in the group call. The group call maintenance message contains information concerning the base stations located within the areas of the radio cells forming the group call area, and the group call group identity.

대표청구항 ▼

[ We claim:] [1.] A system controller in a mobile radio system, said controller comprising:means for controlling operation of a plurality of base stations;memory means for storing information concerning mobile stations;interface means for providing telecommunication connections;a switching matrix fo

[ We claim:] [1.] A system controller in a mobile radio system, said controller comprising:means for controlling operation of a plurality of base stations;memory means for storing information concerning mobile stations;interface means for providing telecommunication connections;a switching matrix for switching speech paths;controller means for call establishment and release, said controller means comprising:means for sending on a traffic channel via each base station located within a group call area during a group call, to a mobile station participating in said group call, one or a plurality of group call maintenance messages containing at least identities of said base stations located within said group call area, identities of said traffic channels used as group call traffic channels at said base stations, and a group call group identity.