| 摘要 |
A mobile communication unit that receives communications services of a cellular communication system within the service area of the cellular communication system and receives communications services of a satellite communication system outside the service area. The mobile communication unit includes a state monitor for monitoring the state of services of the satellite communication system, a memory in which information about the service areas of the cellular communication system is stored, a decision circuit, and a switching controller. If the state monitor detects deterioration of the state of services of the satellite communication system, the decision circuit makes a decision based on the information stored in the memory as to whether the present location of the unit itself is within the service areas of the cellular communication system. If the result of the decision made by the decision circuit is that the present location of the unit itself is outside the service area, the switching controller maintains the services of the satellite communication system. If the present location is within the service areas, the switching controller switches to the services of the cellular communication system.
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