Radio telephone device capable of identifying an interrupting caller and telephone system using the same

• US 5,363,429 A
• Filed: 05/22/1992
• Issued: 11/08/1994
• Est. Priority Date: 05/23/1991
• Status: Expired due to Term

• Current Assignee: Fujitsu Toshiba Mobile Communications Limited (Fujitsu Limited)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Fujisawa, Akiko
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US07/887,005
• Time in Patent Office: 900 Days
• Field of Search: 379/57, 379/58, 379/59, 379/61, 379/355, 379/356, 379/63, 379/88, 455/68
• US Class Current: 455/415
• CPC Class Codes: H04M 1/2745 using static electronic memories, e.g. chips
• CPC Class Codes: H04M 1/2749 Automatic dialling or redialling systems, e.g. on off-hook or redial on busy
• CPC Class Codes: H04M 1/57 Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set at the operator set in a manual exchange H04M5/20
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 3/20 with means for interrupting existing connections; with means for breaking-in on conversations
• CPC Class Codes: H04M 3/428 Arrangements for placing incoming calls on hold
• CPC Class Codes: H04M 3/533 Voice mail systems
• CPC Class Codes: H04W 4/16 Communication-related supplementary services, e.g. call-transfer or call-hold
• CPC Class Codes: H04W 4/20 Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel

Abstract

Information on the telephone number of a terminal which made an interrupting call during telephonic communication is detected, displayed on a display and stored in memory. After completion of the telephone communication, the information on the telephone number stored in the memory is retrieved. By depressing "SND" key when the retrieved telephone number is being displayed, a call is automatically placed on the basis of the telephone number. Even if an interrupting call is received, the interrupter is recognized without stoppage of the ongoing telephonic communication and the interrupter can be accessed later with a simple operation.

Claims

1. A telephone system comprising:

a control terminal having an exchanging function;

a plurality of mobile telephone switching offices connected to the control terminal;

a plurality of base stations each connected to one of the mobile telephone switching offices;

a plurality of radio telephone sets, each having a display unit and an assigned telephone number, each to be connected to one of the mobile telephone switching offices via a radio channel and operable for sending a call signal including the assigned telephone number;

wherein the control terminal includes;

means for controlling a connection between a first radio telephone set and a second radio telephone set,

means for receiving an interrupting call signal from a third radio telephone set directed to the first radio telephone set during the connection between the first radio telephone set and the second radio telephone set,

means for detecting a telephone number of the third radio telephone set included in the interrupting call signal, and

means for transmitting the detected telephone number to the mobile telephone switching office which controls the first radio telephone set,

wherein each of the mobile telephone switching offices include;

means for detecting the assigned telephone number of the third radio telephone set, and

means for generating control information including the detected telephone number,

wherein each of the base stations include means for sending the control information to the first radio telephone set, and

wherein the first radio telephone set includes means for detecting the assigned telephone number of the third radio telephone set in the control information and means for displaying the detected telephone number on the display unit of the first radio telephone set.

2. A telephone system comprising:

a plurality of radio telephone sets;

a plurality of mobile telephone switching offices to be connected to the radio telephone sets through radio channels; and

a control terminal for controlling connection among the radio telephone sets via the mobile telephone switching offices;

wherein the control terminal includes;

means for controlling a connection between a first radio telephone set and a second radio telephone set;

means for receiving an interrupting call signal from a third radio telephone set directed to the first radio telephone set during the connection between the first radio telephone set and the second radio telephone set, the interrupting call signal including identification information of the third radio telephone set;

means for detecting the identification information of the third radio telephone set from the interrupting call signal; and

means for transmitting the detected identification information to a mobile telephone switching office which controls the first radio telephone set;

wherein the mobile telephone switching offices each include;

means for receiving the identification information transmitted from the control terminal;

means for generating a control signal which includes the identification information of the third radio telephone set transmitted from the control terminal; and

means for transmitting the control signal to the first radio telephone set; and

wherein the first radio telephone set includes;

means for receiving the control signal transmitted from the mobile telephone switching office which controls the first radio telephone set during the connection with the second radio telephone set;

means for detecting the identification information of the third radio telephone set from the control signal; and

means for informing a user of the first radio telephone set of the identification information of the third radio telephone set.