Mobile radio telephone system
First Claim
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1. A mobile radio telephone system comprising:
- a plurality of base stations disposed in contiguous cellular zones and equipped for communication on a single, common control channel and on a plurality of voice channels, each of said voice channels communicating a voice signal to a corresponding base station within its respective cellular zone;
at least one mobile station equipped to access said common control channel when originating or answering a call from one of said base stations, to switch to one of said voice channels at the occurrence of the call, and to transmit a hand-off request on said common control channel if the quality of the voice signal becomes degraded during the call; and
a line control unit for centralized control of said base stations, equipped to switch a call from one of said plurality of base stations to an adjacent base station of said plurality of base stations in response to said hand-off request.
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Abstract
In a mobile radio telephone system having multiple base stations controlled by a single line control unit, all base stations use a single common control channel in addition to their voice channels to communicate with a mobile station. If a calling signal from a mobile station is received by two or more base stations at once on the common control channel, the base station with the highest received signal level is selected. If voice signal quality becomes degraded during a call, the call is handed off to the base station with the highest received signal level.
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Citations
20 Claims
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1. A mobile radio telephone system comprising:
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a plurality of base stations disposed in contiguous cellular zones and equipped for communication on a single, common control channel and on a plurality of voice channels, each of said voice channels communicating a voice signal to a corresponding base station within its respective cellular zone; at least one mobile station equipped to access said common control channel when originating or answering a call from one of said base stations, to switch to one of said voice channels at the occurrence of the call, and to transmit a hand-off request on said common control channel if the quality of the voice signal becomes degraded during the call; and a line control unit for centralized control of said base stations, equipped to switch a call from one of said plurality of base stations to an adjacent base station of said plurality of base stations in response to said hand-off request. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mobile radio telephone system comprising a plurality of base stations connected to a single line control unit, and at least one mobile station with which said base stations communicate via a common control channel and one or more voice channels, wherein the system comprises:
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received signal voltage detection means for detecting the received signal voltage level at the base station; signal transmitting means for transmitting a signal indicating the received signal voltage level detected by the received signal voltage detection means; and an arbitration means for receiving the signal transmitted from the signal transmitting means and selecting a particular one of the two or more base stations that receive a calling signal originated from the mobile station; and time slot selection means in each of said base stations for selecting a particular time slot of a plurality of time slots depending on the detected voltage level and triggering the signal transmitting means to transmit a response signal to the arbitration means indicating that the received signal voltage level in the time slot selected by said time slot selection means. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification