| 摘要 |
<p>The present invention relates to a cellular radio system comprising: a mobile services switching center (MSC), and a plurality of radio cells (BTS1-BTS3), each radio cell comprising means for establishing a communication path between the mobile services switching center and subscriber stations (MS, 1), located within the radio coverage area of the radio cell. In order to define a home zone for a subscriber station said system comprises a service positioning system (SPS) comprising means for providing a list of radio cells (BTS1-BTS3) as a response to location information (BTS3) fed into the service positioning system, said radio cells being located in the vicinity of a location (P) indicated by said location information, means for defining an initial home zone for a subscriber station (MS) to consist of the radio cells (BTS1-BTS3) included in said list provided by the service positioning system (SPS), monitoring means (IN) for monitoring the calls of said subscriber station (MS) and for storing into a memory means an identifier of the radio cell used for each such call, where the radio cell used for the call belongs to the initial home zone of the subscriber station (MS), and means for defining a home zone for said subscriber station to consist of the radio cells (BTS1, BTS3), which have their identifier stored in said memory means.</p> |
