Radio personal communications system and method for allocating frequencies for communications between a cellular terminal and a base station

• US 5,428,668 A
• Filed: 11/04/1993
• Issued: 06/27/1995
• Est. Priority Date: 11/04/1993
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Dent, Paul W., Haartsen, Jacobus C.
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): Chernoff, Michael B.
• Application Number:
  US08/148,828
• Time in Patent Office: 600 Days
• Field of Search: 379/58, 379/59, 379/60, 379/61, 379/63, 455/33.1, 455/33.2, 455/54.1, 455/54.2, 455/56.1
• US Class Current: 455/452.1
• CPC Class Codes: H04W 16/16 for PBS [Private Base Station] arrangements
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

Transceiver frequency and optionally power level are allocated to a radio personal communications system which includes a base station connected to a wire telephone network and a cellular terminal operating within a region of a wide area cellular network to minimize interference between communications over the wide area cellular network and communications between the base station and the cellular terminal. The same cellular terminal may thus be used to communicate over the lower cost wire network when within range of the base station and over the wide area cellular network otherwise. The frequency for communications between the cellular terminal and the base station are optionally assigned by the operator of the wide area cellular network so appropriate frequencies and power levels can be assigned for base stations, to minimize same channel interference with the wide area cellular network.

Claims

1. A telephone base station for connecting a wire telephone network to a cellular terminal within a local region of a wide area cellular network which uses a plurality of frequencies within a spectrum, comprising:

means for electrically connecting said telephone base station to said wire telephone network;

activating means, connected to said electrically connecting means, for detecting an incoming call on said wire telephone network;

radio transceiving means, responsive to said activating means, for initiating communications with said cellular terminal using a selected one of said frequencies within the spectrum of said wide area cellular network when said cellular terminal is within said local region;

means for detecting that a power connection and a wire telephone network connection to said telephone base station have been established; and

channel selecting means, responsive to said detecting means, for selecting an available channel within said cellular spectrum for communications between said cellular terminal and said telephone base station when said cellular terminal is within said local region, wherein said channel selecting means selects said available channel from one of said frequencies which is not allocated to the cell of said wide area cellular system in which said telephone base station is located.

2. A telephone base station as in claim 1 wherein said activating means further comprises means for detecting a communication from said cellular terminal received by said radio transceiving means at a selected frequency within the spectrum of said wide area cellular network and for generating an OFF-HOOK indication to said electrically connecting means in response thereto.

3. A telephone base station for connecting a wire telephone network to a cellular terminal within a local region of a wide area cellular network which uses a plurality of frequencies within a spectrum, comprising:

means for electrically connecting said telephone base station to said wire telephone network;

activating means, connected to said electrically connecting means, for detecting an incoming call on said wire telephone network;

radio transceiving means, responsive to said activating means, for initiating communications with said cellular terminal using a selected one of said frequencies within the spectrum of said wide area cellular network when said cellular terminal is within said local region;

means for detecting that a power connection and a wire telephone network connection to said telephone base station have been established; and

frequency selecting means, responsive to said detecting means, for selecting an available one of said frequencies within the cellular spectrum for communications between said cellular terminal and said telephone base station when said cellular terminal is within said local region, wherein said frequency selecting means selects said available frequency from one of said frequencies which is not allocated to the cell of said wide area cellular system in which said telephone base station is located.

4. A telephone base station as in claim 3 wherein said frequency selecting means selects said frequency from the group of said frequencies allocated to the cell of said wide area cellular system which is located a greater distance from said base station than other cells of said wide area cellular system.

5. A telephone base station as in claim 3 wherein said activating means further comprises means for detecting a communication from said cellular terminal received by said radio transceiving means at a selected frequency within the spectrum of said wide area cellular network and for generating an OFF-HOOK indication to said electrically connecting means in response thereto.

6. A radio personal communications system for operation within a wide area cellular network, which uses a plurality of frequencies within a spectrum, and within a base region linked to a wire telephone network, which base region overlaps with said cellular network, comprising:

a battery powered radio terminal operating within the cellular spectrum;

a telephone base station located within said base region and connected to said wire telephone network;

means for detecting that a connection between said telephone base station and said wire telephone network has been established; and

channel selecting means within at least one of said radio terminal and said telephone base station, and responsive to said detecting means, for selecting an available channel within said cellular spectrum for communications between said radio terminal and said telephone base station when said radio terminal is within said base region, wherein said channel selecting means selects said available channel from one of said frequencies which is not allocated to the cell of said wide area cellular system in which said telephone base station is located;

said telephone base station further comprising first transceiving means, electrically connected to said wire telephone network, and responsive to said channel selecting means, for communicating with said radio terminal using said selected channel when said radio terminal is within said base region; and

said radio terminal further comprising second transceiving means, for communicating with said wide area cellular network when said radio terminal is not within said base region and for communicating with said first transceiver means when said radio terminal is within said base region.

7. A radio personal communications system as in claim 6 wherein said telephone base station further comprises:

power line connecting means;

battery charging means electrically connected to said power line connecting means;

second detecting means electrically connected to said wire telephone network and to said power line connecting means, for detecting if the electrical connections of said telephone base station to said wire telephone network and of said power line connecting means to an external power source have been lost; and

means, responsive to said second detecting means, for preventing transmission by said radio transceiving means at said selected frequency after the electrical connections of said wire telephone connector to said wire telephone network and of said power line connection means to an external power source have been lost.

8. A telephone base station for a radio telephone network operating within a wide area cellular network comprising:

a portable housing;

means, extending within said portable housing, for electrically connecting said telephone base station to a wire telephone network;

radio transceiving means in said portable housing;

means, in said portable housing, for receiving an external frequency indicating signal;

means, in said portable housing, responsive to said external frequency indicating signal, for operating said transceiving means at a frequency corresponding to the received frequency indicating signal;

power line connecting means extending within said portable housing;

detecting means, electrically connected to said connecting means and to said power line connecting means, for detecting if the electrical connections of said wire telephone connector to said wire telephone network and of said power line connector to an external power source have been lost; and

means, in said portable housing, responsive to said detecting means, for preventing transmission by said radio transceiving means at said selected frequency after the electrical connections of said wire telephone connector to said wire telephone network and of said power line connection means to an external power source have been lost.

9. A telephone base station for a radio telephone network according to claim 8 wherein said frequency indicating signal receiving means comprises means for receiving said frequency indicating signal from said wide area cellular network.

10. A telephone base station as in claim 8 further comprising:

battery charging means in said portable housing and electrically connected to said power line connecting means.

11. A method for allocating a frequency to a telephone base station which connects a wire telephone line to a cellular terminal within a base region of a wide area cellular network, said method comprising the steps of:

requesting a frequency from the wide area cellular network via the wire telephone line which is connected to said telephone base station;

receiving an indication of the requested frequency from the wide area cellular network via the wire telephone line which is connected to said telephone base station;

transmitting an indication of the received frequency to the cellular terminal;

determining if the telephone connection to the telephone base station via the wire telephone line has been lost since the indication of the requested frequency was received; and

conditionally repeating said requesting, said receiving and said transmitting steps if said telephone connection to the telephone base station has been lost since the indication of the requested frequency was received.

12. The method of claim 11 further comprising the step of notifying the wide area cellular network of the location of the base station.

13. The method of claim 12 wherein said requesting step comprises the step of:

calling the wide area cellular network using a predetermined service number to request a frequency from the wide area cellular network.

14. The method of claim 11 wherein said determining step further comprises the step of determining if the power connection to the telephone base station has been lost since the indication of the requested frequency was received and wherein said conditionally repeating step comprises the step of repeating said requesting, storing and transmitting steps if said telephone and power connections to the telephone base station have been lost since the indication of the requested frequency was received.