Portable telephone set transmitting area identification signal indicative of a radio zone occupied thereby
First Claim
1. A portable telephone set for use in a mobile communication system comprising a plurality of base stations disposed in respective radio zones, the base stations being assigned with area identifiers for identifying the respective radio zones, the base stations transmitting area identification signals indicative of the area identifiers on a control channel, said portable telephone set being located in a first one of said radio zones for a first one of the base stations so that said portable telephone set enables to communicate with said first one of the base stations via the control channel and a plurality of voice channels, said portable telephone set comprising:
- receiving means for receiving a first area identification signal transmitted from said first one of the base stations via the control channel;
area identification holding means, connected to said receiving means, for holding the first area identification signal as a current area identification signal;
determining means, responsive to an incoming call signal from said first one of the base stations, for determining whether or not a user of said portable telephone set answers to the incoming call signal within a predetermined time interval elapsed since the incoming call signal is received;
ensuring means, connected to said determining means, for ensuring one of the voice channels as an ensured voice channel by carrying out an automatic answering for the incoming call signal when said user does not answer to the incoming call signal within the predetermined time interval; and
transmitting means, connected to said ensuring means and said area identification holding means, for transmitting the current area identification signal on the ensured voice channel.
1 Assignment
0 Petitions
Accused Products
Abstract
In a mobile communication system comprising a plurality of base stations disposed in respective radio zones, a portable telephone set (20) comprises a radio transmission/reception section (24) for receiving a first area identification signal transmitted from a first base station. A main RAM (22) holds the first area identification signal as a current area identification signal. Responsive to an incoming call signal for the first base station, a main CPU (21) determines whether or not a user of the portable telephone set answers to the incoming call signal within a predetermined time interval elapsed since the incoming call signal is received. The main CPU (21) ensures one of the voice channels as an ensured voice channel by carrying out an automatic answering for the incoming call signal when the user does not answer to the incoming call signal within the predetermined time interval. The radio transmission/reception section (24) transmits the current area identification signal stored in the main RAM (22) on the ensured voice channel.
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Citations
12 Claims
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1. A portable telephone set for use in a mobile communication system comprising a plurality of base stations disposed in respective radio zones, the base stations being assigned with area identifiers for identifying the respective radio zones, the base stations transmitting area identification signals indicative of the area identifiers on a control channel, said portable telephone set being located in a first one of said radio zones for a first one of the base stations so that said portable telephone set enables to communicate with said first one of the base stations via the control channel and a plurality of voice channels, said portable telephone set comprising:
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receiving means for receiving a first area identification signal transmitted from said first one of the base stations via the control channel; area identification holding means, connected to said receiving means, for holding the first area identification signal as a current area identification signal; determining means, responsive to an incoming call signal from said first one of the base stations, for determining whether or not a user of said portable telephone set answers to the incoming call signal within a predetermined time interval elapsed since the incoming call signal is received; ensuring means, connected to said determining means, for ensuring one of the voice channels as an ensured voice channel by carrying out an automatic answering for the incoming call signal when said user does not answer to the incoming call signal within the predetermined time interval; and transmitting means, connected to said ensuring means and said area identification holding means, for transmitting the current area identification signal on the ensured voice channel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A portable telephone set for use in a mobile communication system comprising a plurality of base stations disposed in respective radio zones, the base stations being assigned with area identifiers for identifying the respective radio zones, the base stations transmitting area identification signals indicative of the area identifiers via a control channel, said portable telephone set being located in a first one of said radio zones for a first one of the base stations so that said portable telephone set enables to communicate with said first one of the base stations via the control channel and a plurality of voice channels, said portable telephone set comprising:
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receiving means for receiving a first area identification signal transmitted from said first one of the base stations via the control channel; area identification holding means, connected to said receiving means, for holding the first area identification signal as a current area identification signal; ensuring means, responsive to an incoming call signal from said first one of the base stations, for ensuring one of the voice channels as an ensured voice channel by carrying out an answering for the incoming call signal; and transmitting means, connected to said ensuring means and said area identification holding means, for transmitting the current area identification signal on the ensured voice channel. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification