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Cellular telephone systems and other mobile communication systems are emerging in which cellular telephone sets comprise receivers which continuously transmit information to a cellular base station associated with the receiver. In one such cellular telephone system, a cellular service operator may obtain a subscription within a given geographical area for the service that includes the coverage area of respective cellular base stations. By way of example, a first cellular base station may be connected to service subscriber sets which are located within a central city within the first coverage area, and may be further connected to another city (e.g., a city having a metropolitan, suburban, or rural characteristics) located outside the first coverage area. In such a first city (e.g., the central city), a subscriber set may, through a connection to the first base station, obtain cellular telephone service through a central office switch, which may be connected to, for example, a Public Switched Telephone Network (PSTN).
The subscriber set may then utilize the second city for communication beyond the coverage area of the first base station. For example, a radio link may be established from the subscriber set to a second cellular base station in the second city, which may, by way of way of example, be located in a university or private house of a subscriber. The radio link between the subscriber set and the second cellular base station is established through a conventional public land mobile network radio frequency (RFF) channel or an air interface. Such air interface may be a time division multiple access (TDMA) channel, for example, such as that set in accordance with the Global System for Mobile Communications (GSM) standard. This may thus be known as a radio link established through the Public Land Mobile Network (PLMN) as opposed to an air interface connection between the mobile communication system itself and a subscriber set. The PLMN may also be known as the cellular switch, public land mobile network/cellular office, or cellular radio network.
In addition to using the second cellular base station of the second city for communication, the subscriber set may also have mobile-to-mobile communication