Radio telephone system and its control method

• US 5,195,127 A
• Filed: 06/27/1991
• Issued: 03/16/1993
• Est. Priority Date: 09/19/1988
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ichikawa, Tomohisa, Ito, Koichi
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US07/724,470
• Time in Patent Office: 628 Days
• Field of Search: 379/56, 379/57, 379/58, 379/59, 379/61, 379/62, 379/63, 379/88, 379/243
• US Class Current: 455/435.1
• CPC Class Codes: H04M 1/733 with a plurality of base stations connected to a plurality of lines for selection in cordless PBX H04W84/16
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

A radio telephone system which is suitable when the number of radio telephone sets is relatively small, communication traffic is low, and the system must cover a wide communication area, and a method of controlling the system is disclosed. In the system, a plurality of base stations commonly connected to a wired line and at least one radio telephone set are provided and the position registration of the radio telephone set is carried out with respect to either one of the base stations so that when the system receives an incoming call from the wired line, a radio speech circuit is established between the position-registration base station and the radio telephone set. The position registration can be realized by depressing a particular key provided to the radio telephone set or by operating a keyboard or the like provided to a particular one of the base stations. Further, the base stations are respectively removably connected so that the radio zone of the system can be arbitrarily expanded or reduced as necessary.

Claims

1. A radio telephone system comprising:

a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set; and

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set when said system receives an incoming call on said wire line,

wherein said position registering means includes external input means provided to a specific one of said plurality of base stations, and the position registration of said at least one radio telephone set is carried out through input from said external input means.

2. A radio telephone system comprising:

a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set; and

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set when said system receives an incoming call on said wire line,

wherein said position registering means includes external input means provided to said at least one radio telephone set, and the position registration of said at least one radio telephone set is carried out through input from said external input means through a radio communication.

3. A radio telephone system comprising:

a main base station connected to a wired line and covering a predetermined radio zone;

a plurality of sub base stations, one of which being connected to said main base station, each of said sub base stations covering a different radio zone which is different from the predetermined radio zone covered by said main station, and being sequentially connected to a preceding sub base station such that a communication path is provided from each sub base station to said main base station through said preceding sub base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said main and sub base stations to establish a position-registered base station for said at least one radio telephone set; and

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set when said system receives an incoming call on said wired line,

wherein said position registering means includes external input means provided to said main base station, and the position registration of said at least one radio telephone set is carried out through input from said external input means.

4. A radio telephone system, comprising:

a main base station connected to a wired line and covering a predetermined radio zone;

a plurality of sub base stations, one of which being connected to said main base station, each of said sub base stations covering a different radio zone which is different from the predetermined radio zone covered by said main station, and being sequentially connected to a preceding sub base station such that a communication path is provided from each sub base station to said main base station through said preceding sub base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said main and sub base stations to establish a position-registered base station for said at least one radio telephone set; and

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set when said system receives an incoming call on said wired line,

wherein said position registering means includes external input means provided to said at least one radio telephone set, and the position registration of said at least one radio telephone set is carried out through input from said external input means through a radio communication.

5. The radio telephone system as set forth in claim 4, wherein said external input means includes a plurality of keys corresponding respectively to said main and sub base stations.

6. A radio telephone system comprising:

a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set;

incoming-call-signal transmitting means for transmitting an incoming call signal to said at least one radio telephone set through said position-registered base station when said system receives an incoming call from said wired line;

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set;

calling means for calling said at least one radio telephone set sequentially from the other base stations when failing to receive said incoming-call answering signal from said at least one radio telephone set a predetermined time after sending of said incoming call signal from said position-registered base station; and

voice responding means for sending to said wired line a voice signal indicative of a state in which said at least one radio telephone set is being called, simultaneously with said transmission of said incoming call signal from said incoming-call-signal transmitting means.

7. A radio telephone system comprising:

a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set;

incoming-call-signal transmitting means for transmitting an incoming call signal to said at least one radio telephone set through said position-registered base station when said system receives an incoming call from said wired line;

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set;

calling means for calling said at least one radio telephone set sequentially from the other base stations when failing to receive said incoming-call answering signal from said at least one radio telephone set a predetermined time after sending of said incoming call signal from said position-registered base station; and

voice responding means for sending a voice signal indicative of "no answer" onto said wired line, when said calling means fails to receive an answer from said at least one radio telephone set.

8. A radio telephone system comprising:

a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station;

at least one radio telephone set;

position registering means for registering a position of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set;

incoming-call-signal transmitting means for transmitting an incoming call signal to said at least one radio telephone set through said position-registered base station when said system receives an incoming call from said wired line;

radio communication linking means for establishing a radio communications link between said position-registered base station and said at least one radio telephone set;

calling means for calling said at least one radio telephone set sequentially from the other base stations when failing to receive said incoming-call answering signal from said at least one radio telephone set a predetermined time after sending of said incoming call signal from said position-registered base station; and

first voice responding means for sending a voice signal to said wired line indicative of a state in which said at least one radio telephone set is being called, simultaneously with transmission of said incoming call signal from said incoming-call-signal transmitting means, and further comprising second voice responding means for sending a voice signal indicative of "no answer" onto said wired line, when said calling means fails to receive an answer from said at least one radio telephone set.

9. A method of controlling a radio telephone system including a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, and at least one radio telephone set, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station, said method comprising the steps of:

performing position registration of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set;

transmitting an incoming call signal to said at least one radio telephone set from said position-registered base station when said system receives an incoming call from said wired line;

establishing a radio communications link between said position-registered base station and said at least one radio telephone set when said position-registered base station receives an incoming call answering signal from said at least one radio telephone set in response to said incoming call signal; and

sending to said wired line a voice signal indicative of a state in which said at least one radio telephone set is being called, simultaneously with transmission of said incoming call signal from said position-registered base station.

10. A method of controlling a radio telephone system including a plurality of base stations, one of which being connected to one wired line which is connected between the radio telephone system and a telephone network, and at least one radio telephone set, each of said base stations covering a different radio zone respectively, and being sequentially connected to a preceding base station such that a communication path is provided from each base station to said one wired line through said preceding base station, said method comprising the steps of:

performing position registration of said at least one radio telephone set with respect to one of said plurality of base stations to establish a position-registered base station for said at least one radio telephone set;

transmitting an incoming call signal to said at least one radio telephone set from said position-registered base station when said system receives an incoming call from said wired line;

establishing a radio communications link between said position-registered base station and said at least one radio telephone set when said position-registered base station receives an incoming call answering signal from said at least one radio telephone set in response to said incoming call signal; and

sending a voice signal indicative of "no answer" to said wired line, when said position-registered base station fails to receive an answer from said at least one radio telephone set.