Mobile communication system and its control method

Claim 2

A mobile communication system comprising: a plurality of mobile transceivers; a plurality of radio circuits being capable of operating on a plurality of speech channels; a plurality of fixed transceivers coupled through the radio circuits to the mobile transceivers; a line controller coupled to a plurality of wired telephone lines and coupled to the fixed transceivers, including memory means for storing and outputting from time to time a used speech channel list; first informing means, responsive to a call from the wired telephone lines or a call from a mobile transceiver and responsive to the list of used speech channels, for informing a fixed transceiver, proximate to a called or calling mobile transceiver, of the current used speech channel list; and means, responsive to the list of used speech channels, for setting a speech channel between the fixed transceiver and the mobile transceiver, including circuitry in each of the fixed transceivers for selecting a speech channel.

Claim 3

A mobile communication system as set forth in claim 1, wherein said fixed transceivers each include second informing means for informing said line controller, when the speech channel is set by said speech-channel setting means of the set speech channel, and said line controller memory means updates its contents in response to the second informing means.

Claim 4

A mobile communication system as set forth in claim 2, wherein said second informing means sends said set speech channel information to said line controller together with a channel switch completion signal sent from said fixed transceiver.

Claim 5

A mobile communication system as set forth in claim 1, wherein said first informing means, responsive to a call from the wired telephone lines, sends a used speech channel list together with an incoming call signal transmitted from said line controller to the fixed transceiver.

Claim 6

A mobile communication system as set forth in claim 1, wherein said first informing means, responsive to a call from a mobile transceiver, sends a used speech channel list together with an outgoing-call answering signal transmitted from said line controller to the fixed transceiver. a plurality of radio circuits being capable of operating on a plurality of speech channels;

Claim 7

A mobile communication system as set forth in claim 1, wherein said fixed transceivers each have retrieval means for retrieving idle speech channels, and said speech-channel setting means has means for selecting one of the idle speech channels retrieved by said retrieval means, said one idle speech channel causing no interference noise to the in-use speech channels informed by said first informing means.

Claim 8

A mobile communication system as set forth in claim 1, wherein said fixed transceivers each have retrieval means for retrieving idle speech channels and memory means for storing the idle speech channels retrieved by said retrieval means, and said speech channel setting means sets a speech channel on the basis of information on the in-use speech channels informed by said first informing means and information on the idle speech channels stored in said fixed transceiver memory means.

Claim 9

A mobile communication system comprising: a plurality of mobile transceivers; a plurality of radio circuits being capable of operating on a plurality of speech channels; a plurality of fixed transceivers coupled through the radio circuits to the mobile transceivers; a line controller coupled to a plurality of wired telephone lines and coupled to the fixed transceivers, including memory means for storing and outputting from time to time a used speech channel list; first informing means, responsive to a call from the wired telephone lines or a call from a mobile transceiver and responsive to the list of used speech channels, for informing a fixed transceiver, proximate to a called or calling mobile transceiver, of an unusable speech channel list, the first informing means discriminating unusable speech channels on the basis of the current used speech channel list; and means, responsive to the list of used speech channels, for setting a speech channel between the fixed transceiver and the mobile transceiver, including circuitry in each of the fixed transceivers for selecting a speech channel.

Claim 10

A mobile communication system comprising: a plurality of mobile transceivers; a plurality of radio circuits being capable of operating on a plurality of speech channels; a plurality of fixed transceivers coupled through the radio circuits to the mobile transceivers; a line controller coupled to a plurality of wired telephone lines and coupled to the fixed transceivers, including memory means for storing and outputting from time to time a used speech channel list; first informing means, responsive to a call from the wired telephone lines or a call from a mobile transceiver and responsive to the list of used speech channels, for informing a fixed transceiver, proximate to a called or calling mobile transceiver, of an unusable speech channel list, the first informing means discriminating unusable speech channels on the basis of the current used speech channel list; and means, responsive to the list of used speech channels, for setting a speech channel between the fixed transceiver and the mobile transceiver, including circuitry in each of the fixed transceivers for selecting a speech channel.

Claim 11

A mobile communication system as set forth in claim 8, wherein said fixed transceivers each include second informing means for informing said line controller, when the speech channel is set by said speech-channel setting means of the set speech channel, and said line controller memory means updates its contents in response to the second informing means.

Claim 12

A mobile communication system as set forth in claim 9, wherein said second informing means sends said set speech channel information to said line controller together with a channel switch completion signal sent from said fixed transceiver.

Claim 13

A mobile communication system as set forth in claim 8, wherein said first informing means, responsive to a call from the wired telephone lines, sends an unusable speech channel list together with an incoming call signal transmitted from said line controller to the fixed transceiver.

Claim 14

A mobile communication system as set forth in claim 8, wherein said first informing means, responsive to a call from a mobile transceiver, sends an unusable speech channel list together with an outgoing-call answering signal transmitted from said line controller to the fixed transceiver.

Claim 15

A mobile communication system as set forth in claim 8, wherein said fixed transceivers each have retrieval means for retrieving idle speech channels, and said speech-channel setting means has means for selecting one of the idle speech channels retrieved by said retrieval means except for said unusable speech channels informed by said first informing means.

Claim 16

A mobile communication system as set forth in claim 8, wherein said fixed transceivers each have retrieval means for retrieving idle speech channels and memory means for storing the idle speech channels retrieved by said retrieval means, and said speech channel setting means sets a speech channel on the basis of information on the unusable speech channels informed by said first informing means and information on the idle speech channels stored in said fixed transceiver memory means.

Claim 17

A mobile communication system comprising: a plurality of mobile transceivers; a plurality of radio circuits being capable of operating on a plurality of speech channels; a plurality of fixed transceivers coupled through the radio circuits to the mobile transceivers; a line controller coupled to a plurality of wired telephone lines and coupled to the fixed transceivers, including memory means for storing and outputting from time to time a used speech channel list or an unusable speech channel list; first informing means, responsive to a call from the wired telephone lines or a call from a mobile transceiver and responsive to the current speech channel list, for informing a fixed transceiver, proximate to a called or calling mobile transceiver, of a used speech channel list or an unusable speech channel list; means, responsive to the speech channel list, for setting a speech channel between the fixed transceiver and the mobile transceiver, the setting means including means for selecting a speech channel which employs circuitry in the fixed transceiver in cooperation with circuitry in the mobile transceiver; and second informing means, responsive to the speech channel setting means, for informing said line controller of the set speech channel, the line controller memory means updating its contents in response to the second informing means.

Claim 18

A mobile communication system comprising: a plurality of mobile transceivers; a plurality of radio circuits being capable of operating on a plurality of speech channels; a plurality of fixed transceivers coupled through the radio circuits to the mobile transceivers; a line controller coupled to a plurality of wired telephone lines and coupled to the fixed transceivers, including memory means for storing and outputting from time to time a used speech channel list or an unusable speech channel list; first informing means, responsive to a call from the wired telephone lines or a call from a mobile transceiver and responsive to the current speech channel list, for informing a fixed transceiver, proximate to a called or calling mobile transceiver, of a used speech channel list or an unusable speech channel list; means, responsive to the speech channel list, for setting a speech channel between the fixed transceiver and the mobile transceiver, the setting means including means for selecting a speech channel which employs circuitry in the fixed transceiver in cooperation with circuitry in the mobile transceiver; and second informing means, responsive to the speech channel setting means, for informing said line controller of the set speech channel, the line controller memory means updating its contents in response to the second informing means.