| 摘要 |
<p>In a wide area cordless telephone system, a wide service area is divided into a plurality of local service areas (S1, S2) identified respectively by unique codes. Each local area has home position portable cordless telephones (1-1, 1-m, 11-1, 11-m) to which telephone numbers are permanently assigned and can accommodate roaming non-home position telephones belonging to other local areas. Each telephone receives a pre-registration polling signal from one of access units (2-1, 2-l) located at key points and returns a pre-registration response signal if a unique code contained in the received polling signal mismatches a stored area code. A controller (32) in each local area assigns a reserved telephone number, if available, to a roaming telephone in response to such a response signal and registers this cordless telephone in memory (31). The controller then transmits an acknowledgement signal indicating the completion of a registration. The registered telephone responds to it by returning a post-registration signal which is monitored by the controller. The registration of this telephone is cancelled if the controller fails to receive the post-registration signal for a prescribed time interval.</p> |
