| 摘要 |
Subscriber terminal units (TU) are connected over a wireless link via a base station (BS) to an access node (AN) and further from the access node to a local exchange (LE) via a standard V5.2 interface, in which, when the interface is congested and a subscriber (TU) connected to the access node (AN) is attempting to make an emergency call to a public emergency number, the call control system of the local exchange (LE) cannot at once find a free time slot for the setup of the emergency call. In the procedure, call setup requests for other than emergency calls over the V5.2 interface are disabled during a predetermined period of time t2, and attempts to allocate a time slot in the V5.2 interface for the emergency call are repeated during such predetermined period of time t2. |
