| 摘要 |
A telecommunications system, such as a wide area digital paging system, comprises a plurality of geographically separated primary stations (PS1, PS2, PS3), each defining a coverage area (CAR1, CAR2, CAR3), controlled by a system controller (10) to operate as a large area network. Subscriber units (SS1, SS2) are able to roam from coverage area to coverage area. In order for a roaming subscriber unit (SS1, SS2) to know which channel it should tune to, the primary stations (PS1, PS2, PS3) from time to time transmit a system wide announce channels message giving details of the channels available. The subscriber units have means for selecting one of the available channels. |
