| 摘要 |
The invention relates to a method for maintaining a group call in a mobile radio system, and a mobile station (MS1, MS2, MS3, MS4, MS5) in a mobile radio system, wherein the geographical area covered by the system is divided into radio cells (K1, K2, K3, K4), each radio cell comprising a base station (BS1, BS2, BS3, BS4), a group call being established between the mobile stations (MS1, MS2, MS3, MS4) belonging to a group call group and residing within the areas of the radio cells (K1, K2, K3) forming a limited group call area. In order that the mobile station (MS1), on changing (T1) the radio cell (K1), would be able to select the base station (BS2) within the area of which the group call is in progress, the base stations (BS1, BS2, BS3) send one or a plurality of group call maintenance messages (S1) to the mobile stations (MS1, MS2, MS3, MS4) involved in the group call, the group call maintenance message (S1) containing information concerning the base stations (BS1, BS2, BS3) located within the areas of the radio cells forming the group call area, and the group call group identity (GROUP ID). |
