Radio communication system having control method for shortening call response time

Claim 2

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting incoming-signal answering signals containing an ID code of a corresponding radio terminal unit to said base unit at mutually shifted times in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from said plurality of radio terminal units; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 3

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting incoming-signal answering signals containing an ID code of a corresponding radio terminal unit to said base unit at timings prescribed by said ID code in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from said plurality of radio terminal units; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 4

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting incoming-signal answering signals containing an ID code of a corresponding radio terminal unit to said base unit at timings prescribed by said ID code in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from said plurality of radio terminal units; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 5

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting an incoming-signal answering signal containing an ID code of a corresponding radio terminal unit to said base unit in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from said plurality of radio terminal units; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives said incoming-signal answering signals from all the radio terminal units within a predetermined time or when said base unit receives an incoming-signal answering signal from at least one of the radio terminal units and said predetermined time elapses; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 6

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting an incoming-signal answering signal containing an ID code of a corresponding radio terminal unit to said base unit in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from said plurality of radio terminal units; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives said incoming-signal answering signals from all the radio terminal units within a predetermined time or when said base unit receives an incoming-signal answering signal from at least one of the radio terminal units and said predetermined time elapses; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 7

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting an incoming-signal answering signal containing an ID code of a corresponding radio terminal unit to said base unit in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from one of said plurality of radio terminal units from which said incoming-signal answering signal was transmitted and received first by said base unit; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 8

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting an incoming-signal answering signal containing an ID code of a corresponding radio terminal unit to said base unit in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from one of said plurality of radio terminal units from which said incoming-signal answering signal was transmitted and received first by said base unit; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 9

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting an incoming-signal answering signal containing an ID code of a corresponding radio terminal unit to said base unit in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from one of said plurality of radio terminal units which has transmitted the incoming-signal answering signal having an electric field of the greatest intensity; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 10

A radio communication system, comprising: a base unit connected to a wired line; a plurality of radio terminal units to be coupled through a radio circuit with said base unit; incoming-signal transmitting means, included in said base unit, for transmitting an incoming signal to said plurality of radio terminal units when said base unit receives an incoming call from said wired line; incoming-signal answering signal transmitting means, included in each of said radio terminal units, for transmitting an incoming-signal answering signal containing an ID code of a corresponding radio terminal unit to said base unit in response to a reception of said incoming signal; representative radio terminal selecting means, included in said base unit, for selecting a representative radio terminal unit from one of said plurality of radio terminal units which has transmitted the incoming-signal answering signal having an electric field of the greatest intensity; channel-designation-signal transmitting means, included in said base unit, for transmitting a channel designation signal specifying a predetermined speech channel and a representative radio terminal designation signal specifying the representative radio terminal unit selected by said representative radio terminal selecting means to said plurality of radio terminal units when said base unit receives an incoming-signal answering signal from at least one of said plurality of radio terminal units; channel switching means, included in each of said radio terminal units, for switching a radio channel of each radio terminal unit to said predetermined speech channel on the basis of said channel designation signal; a plurality of discriminating means, each included in a corresponding one of said radio terminal units, for judging on the basis of said representative radio terminal designation signal whether or not the radio terminal unit corresponding thereto is the representative radio terminal unit; channel-switching-completion-signal transmitting means, included in each of said radio terminal units, for transmitting a channel switching completion signal to said base unit when said discriminating means judges that the radio terminal unit corresponding thereto is the representative radio terminal unit and when channel switching is completed; ringing-signal transmitting means, included in said base unit, for transmitting a ringing signal to said plurality of radio terminal units in response to a reception of said channel switching completion signal; and means, included in each of said radio terminal units, for generating a ringing tone in response to a reception of said ringing signal.

Claim 15

A method of controlling a radio communication system as set forth in claim 7, wherein the transmission of said incoming-signal answering signals is carried out in mutually shifted timing relationship between said plurality of radio terminal units.

Claim 16

A method of controlling a radio communication system as set forth in claim 7, wherein said base unit transmits said channel designation signal when receiving said incoming-signal answering signals from all the radio terminal units within a predetermined time or when receiving the incoming-signal answering signal from at least one of said plurality of radio terminal units and said predetermined time elapses.

Claim 17

A method of controlling a radio communication system as set forth in claim 7, wherein said radio terminal units return to a wait mode when failing to receive said incoming signal or when failing to receive said channel designation signal within a predetermined time after transmission of said incoming-signal answering signals.