Apparatus for providing a mobility adjunct for the public switched telephone network

• US 5,771,465 A
• Filed: 03/14/1997
• Issued: 06/23/1998
• Est. Priority Date: 06/05/1995
• Status: Expired due to Fees

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Bojeryd, Nils
• Primary Examiner(s): MacDonald, Allen R.
• Assistant Examiner(s): RICHARDSON, SCO
• Application Number:
  US08/818,244
• Time in Patent Office: 466 Days
• Field of Search: 455/426, 455/422, 455/445, 455/465, 455/520, 455/554, 395/401
• US Class Current: 455/554.2
• CPC Class Codes: H04M 1/725 Cordless telephones user interfaces specially adapted therefor H04M1/724
• CPC Class Codes: H04M 3/42238 in systems with telephone lines with multiple users
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

A system and method for providing a mobility adjunct for a telecommunications network. The system and method allow one or more subscriber stations, connected to an analog interface of the network, and one or more wireless subscriber stations, each operating in a wireless telephone system of the network, to function as extension phones. The invention maintains a fixed line appearance and emulates a fixed termination in the network for the wireless subscriber station.

Claims

1. In a telecommunications network comprising a subscriber line connected to an end office and a given wireline communications terminal, a trunk connection providing one or more timeslots for communications traffic in the forward and reverse direction, a channel bank connected between said subscriber line and said trunk connection, said channel bank providing a communications connection between a call on said subscriber line and a timeslot of said one or more timeslots of said trunk connection dedicated to the subscriber line, a wireless telephone system, a wireless communications terminal operating within said wireless telephone system, and a mobility adjunct controller connected between said trunk connection and said wireless telephone system, a method for providing a mobility adjunct service to said subscriber line, said method comprising the steps of:

receiving a wireline call on said subscriber line;

seizing said dedicated timeslot of said trunk connection in the forward direction at said channel bank;

detecting seizure of said dedicated timeslot in the forward direction at said mobility access controller;

identifying a directory number for the wireless communications terminal associated with said dedicated seized timeslot;

initiating a call setup using the identified directory number from said mobility adjunct controller to said wireless subscriber station through said wireless telephone system; and

connecting for communication, through the channel bank, the seized timeslot of the trunk connection and the mobility adjunct controller, the setup call initiated in said wireless telephone system with said received wireline call on said subscriber line.

2. In a telecommunications network comprising a subscriber line connected to an end office and a given wireline communications terminal, a trunk connection providing one or more timeslots for communications traffic in the forward and reverse direction, a channel bank connected between said subscriber line and said trunk connection, said channel bank providing a communications connection between said subscriber line and a timeslot of said one or more timeslots of said trunk connection dedicated to the subscriber line, a wireless telephone system, a wireless communications terminal operating within said wireless telephone system, and a mobility adjunct controller connected between said trunk connection and said wireless telephone system, a method for providing a mobility adjunct service to said subscriber line, said method comprising the steps of:

receiving an off-hook signal from and establishing a call connection with said wireless communications terminal at said mobility adjunct controller and through said wireless telephone system;

said dedicated timeslot of said trunk connection associated with said wireless subscriber station;

seizing said identified dedicated timeslot in the reverse direction at said mobility adjunct controller; and

connecting for communication, through the channel bank, the seized dedicated timeslot and the mobility adjunct controller, the established call connection with said wireless communications terminal to said subscriber line.

3. In a telecommunications network comprising a subscriber line connected to an end office and a given wireline communications terminal, a trunk connection providing one or more timeslots for communications traffic in the forward and reverse directions, a channel bank connected between said subscriber line and said trunk connection, said channel bank providing a communications connection between a call on said subscriber line and a timeslot of said one or more timeslots of said trunk connection dedicated to the subscriber line, a wireless telephone system, a wireless communications terminal operating within said wireless telephone system, a PSTN-trunk, a mobility adjunct controller connected between said PSTN-Trunk and said wireless telephone system, and a wireless gateway connected between said trunk connection and the PSTN-Trunk, a method for providing a mobility adjunct service to the subscriber line, said method comprising the steps of:

receiving a wireline call on said subscriber line;

seizing said dedicated timeslot of said trunk connection in the forward direction at said channel bank;

detecting seizure of said dedicated timeslot in the forward direction at said wireless gateway;

identifying a directory number for the wireless communications terminal associated with said dedicated seized timeslot;

initiating a call setup from said wireless gateway to the wireless communications terminal associated with said identified directory number using said PSTN-Trunk, said mobility access controller and the wireless telephone system; and

connecting for communication, through the channel bank, the seized timeslot of the trunk connection, the wireless gateway, the PSTN-Trunk and the mobility adjunct controller, the setup call initiated by the wireless gateway with the wireless communications terminal to said received wireline call on said subscriber line.

4. In a telecommunications network comprising a subscriber line connected to an end office and a given wireline communications terminal, a trunk connection providing one or more timeslots for communications traffic in the forward and reverse directions, a channel bank connected between said subscriber line and said trunk connection, said channel bank providing a communications connection between said subscriber line and a timeslot of said one or more timeslots of said trunk connection dedicated to the subscriber line, a wireless telephone system, a wireless communications terminal operating within said wireless telephone system, a PSTN-trunk, a mobility adjunct controller connected between said PSTN-Trunk and said wireless telephone system, and a wireless gateway connected between said trunk connection and the PSTN-Trunk, a method for providing a mobility adjunct service to said subscriber line, said method comprising the steps of:

receiving an off-hook signal from and establishing a call connection with said wireless communications terminal at said mobility adjunct controller;

initiating a call on behalf of the wireless communications terminal from said mobility access controller over the PSTN-Trunk to said wireless gateway;

identifying said dedicated timeslot associated with said wireless communications terminal party to the initiated call;

connecting said initiated call to said identified dedicated timeslot of said trunk connection at said wireless gateway;

connecting for communication, through the channel bank, the seized timeslot of the trunk connection, the wireless gateway, the PSTN-Trunk and the mobility adjunct controller, the call connection with the wireless communications terminal and the call initiated by the mobility adjunct controller to said subscriber line.

5. A system for providing a mobility adjunct to a subscriber line of a public switched telephone network, the subscriber line terminated at a wireline communications terminal, the mobility adjunct provided through a wireless communications system including means for establishing a radio frequency communications connection with a wireless communications terminal, the system comprising:

a trunk communications link having a first and second ends;

a channel bank connected to the subscriber line and to the first end of the trunk communications link to interface a given communication carried on the subscriber line to a selected one of a plurality of time slots maintained with respect to the trunk communications link; and

a mobility adjunct controller connected to the second end of the trunk communications link and to the wireless communications system, the controller interfacing the radio frequency communication connection for the wireless communications terminal to the selected timeslot interfaced with the subscriber line and maintained with respect to the trunk communications link, the controller accordingly enabling the given communication carried over the subscriber line associated with the wireline communications terminal to also be connected from the channel bank through the trunk communications link and over the radio frequency communication connection with the wireless communications terminal.

6. The system of claim 5 wherein the operation of the channel bank, trunk communications link and mobility adjunct controller enables the wireline communications terminal and the wireless communications terminal to function as a set of extension communications terminals utilizing the subscriber line associated with the wireline communications terminal.

7. The system of claim 5 wherein the trunk communications link comprises an FX trunk.

8. The system of claim 5 wherein the mobility adjunct controller includes:

a first data table, said first data table associating the selected timeslot with a first directory number, the first directory number used for making a call setup to the wireless communications terminal.

9. The system of claim 8 wherein the mobility adjunct controller further includes:

a second data table, said second data table associating the wireless communications terminal with a second directory number, the second directory number used for making a call setup from the wireless communications terminal; and

a third data table, said third data table associating the second directory number with the selected timeslot, the selected timeslot used in making the call setup from the wireless communications terminal.

10. The system of claim 5 wherein the wireless communications network comprises:

a radio switching exchange connected to the mobility adjunct controller; and

a radio port connected to the radio switching exchange and including means for establishing a radio interface with the wireless communications terminal.

11. The system of claim 5 wherein the subscriber line comprises an analog telephone line connected to both the wireline communications terminal and to the channel bank.

12. A system for providing a mobility adjunct to a subscriber line of a public switched telephone network, the subscriber line terminated at a wireline communications terminal, the mobility adjunct provided through a wireless communications system including means for establishing a radio frequency communications connection with a wireless communications terminal, the system comprising:

a first trunk communications link having a first end and a second end;

a channel bank connected to the subscriber line and to the first end of the first trunk communication link to interface a given communication carried by the subscriber line to a selected one of a plurality of time slots maintained with respect to the first trunk communications link;

a second trunk communications link having a first end and a second end, the second end of the second trunk communications link being connected to the public switched telephone network;

a gateway node connected to the second end of the first trunk communications link and the first end of the second trunk connection to interface for communication on the time slot a call connection over the second trunk communications link and the public switched telephone network;

a third trunk communications link having a first end and a second end, the first end of the second trunk communications link being connected to the public switched telephone network; and

a mobility adjunct controller connected to the second end of the third trunk communications link supporting the call connection through the public switched telephone network and over the second trunk communications link to the gateway node, and also connected to the wireless communications system, the controller interfacing the radio frequency communication for the wireless communications terminal to the call connection, and the gateway interfacing the call connection to the selected timeslot interfaced with the subscriber line and maintained with respect to the first trunk communications link, the controller and gateway accordingly enabling the given communication carried over the subscriber line associated with the wireline communications terminal to also be connected from the channel bank through the first, second and third trunk communications links and over the radio frequency communications connection with the wireless communications terminal.

13. The system of claim 12 wherein the operation of the channel bank, first, second and third trunk communications links, gateway node and mobility adjunct controller enables the wireline communications terminal and the wireless communications terminal to function as a set of extension communications terminals utilizing the subscriber line associated with the wireline communication terminal.

14. The system of claim 12 wherein the first trunk communications link comprises an FX trunk, and the second and third trunk communications links comprise public switched telephone network trunks.

15. The system of claim 12 wherein the gateway includes:

a first data table, said first data table associating the selected timeslot with a first directory number, the first directory number used for making a call setup to the wireless communications terminal.

16. The system of claim 15 wherein the gateway further includes:

a second data table, said second data table associating the wireless communications terminal with a second directory number, the second directory number used for making a call setup from the wireless communications terminal; and

a third data table, said third data table associating the second directory number with the selected timeslot, the selected timeslot used in making the call setup from the wireless communications terminal.

17. The system of claim 12 wherein the wireless communications network comprises:

a radio switching exchange connected to the mobility adjunct controller; and

a radio port connected to the radio switching exchange and including means for establishing a radio interface with the wireless communications terminal.

18. The system of claim 12 wherein the subscriber line comprises an analog telephone line connected to both the wireline communications terminal and to the channel bank.