Pre-paid telecommunication services in LEO mobile satellites system

摘要

A pre-payment subscriber to a satellite mobile telephone system is provided with the same services on roamed terrestrial networks as any other subscriber. The subscriber's network maintains a credit record for each pre-payment subscriber and is capable of calculating, in response to a request from the subscriber's user terminal seeking to access services on another network, the maximum amount of call time which the subscriber's available credit allows on the other network. The available call time is transmitted to the user terminal which controls the call as well as notifying the first network of unelapsed call time.