Methods and systems for allocating a cellular communications channel for communication between a cellular terminal and a telephone base station using received signal strength measurements

• US 5,839,075 A
• Filed: 08/21/1995
• Issued: 11/17/1998
• Est. Priority Date: 08/21/1995
• Status: Expired due to Fees

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Haartsen, Jacobus Cornelius, Dent, Paul W.
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US08/517,710
• Time in Patent Office: 1,184 Days
• Field of Search: 379/58, 379/59, 379/60, 379/61, 379/62, 379/63, 455/33.1, 455/33.2, 455/34.1, 455/34.2, 455/54.1, 455/54.2, 455/56.1, 455/62, 455/63, 455/422, 455/426, 455/429, 455/432, 455/436, 455/437, 455/442, 455/443 , 455/444, 455/446, 455/450, 455/452, 455/455, 455/509, 455/513, 455/516, 455/517, 455/524
• US Class Current: 455/450
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/105 PBS [Private Base Station] network H04W84/12 - H04W84/16 take precedence
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

A cellular communications channel is allocated for communication between a cellular terminal and a telephone base station wherein the telephone base station connects a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of control channels and communications channels within a cellular network spectrum, by controlling the cellular terminal to measure the received signal strengths of the control and communications channels. The cellular terminal is controlled to measure received signal strengths of the control channels. A set of communications channels associated with measured control channel having lowest received signal strength is identified. The cellular terminal is then caused to measure the received signal strengths of the set of communications channels. A communications channel having the lowest received signal strength is selected from the set of communications channels. The selected communications channel having lowest received signal strength is used for communication between the cellular terminal and the telephone base station within the local region. The selected communications channel reduces co-channel interference between the telephone base station and the wide area cellular network and also reduces co-channel interference among the telephone base stations themselves.

Claims

1. A method for allocating a cellular communications channel for communication between a cellular terminal and a telephone base station, the telephone base station connecting a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of control channels and communications channels within a cellular network spectrum, said allocating method comprising the steps of:

controlling said cellular terminal to measure received signal strengths of the control channels;

identifying a set of communications channels associated with a measured control channel having lowest received signal strength;

causing said cellular terminal to measure received signal strengths of the set of communications channels;

selecting from said set of communications channels, a communications channel having lowest received signal strength; and

using the selected communications channel having lowest received signal strength for communication between said cellular terminal and said telephone base station within the local region.

2. A method according to claim 1 wherein said selecting step is preceded by the steps of:

determining whether the received signal strength of the communications channel having lowest received signal strength is sufficiently low; and

repeating said identifying step and said causing step on a next set of communications channels associated with a measured control channel having next lowest received signal strength, if the received signal strength of the channel having lowest received signal strength is not sufficiently low.

3. A method according to claim 1 wherein said identifying step comprises the steps of:

transferring the control channel received signal strength measurements from said cellular terminal to said telephone base station;

transferring the control channel received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network;

causing said wide area cellular network to identify a measured control channel having lowest received signal strength; and

causing the wide area cellular network to identify the set of communications channels associated with the measured control channel having lowest received signal strength.

4. A method according to claim 3 wherein said step of causing said cellular terminal to measure received signal strengths of the set of communications channels is preceded by the steps of:

transferring the identified set of communications channels to said base station from said wide area cellular network via said wire telephone network; and

transferring the identified set of communications channels from said base station to said cellular terminal.

5. A method according to claim 4 wherein said selecting step comprises the steps of:

transferring the communication channel received signal strength measurements from said cellular terminal to said telephone base station;

transferring the communication channel received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network;

causing said wide area cellular network to identify a measured communications channel having lowest received signal strength; and

causing the wide area cellular network to select from the set of communications channels, a communications channel having lowest received signal strength.

6. A method according to claim 5 wherein said using step is preceded by the steps of:

transferring identification of the selected communications channel to said base station from said wide area cellular network via said wire telephone network; and

transferring the identification of the selected communications channel from said base station to said cellular terminal.

7. A method according to claim 1 wherein said controlling step, said identifying step, said causing step and said selecting step are all practiced while said cellular terminal is parked in said telephone base station.

8. A method according to claim 1 wherein said controlling step, said identifying step, said causing step and said selecting step are all practiced while said cellular terminal is parked in said telephone base station, via transfer of electrical signals, electromagnetic signals or acoustic signals between the telephone base station and the cellular terminal which is parked therein.

9. A measuring method for a cellular terminal and a telephone base station, the telephone base station connecting a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of radio channels within a cellular network spectrum wherein said cellular terminal communicates with said telephone base station using one of said radio channels within said cellular network spectrum, said measuring method comprising the steps of:

controlling said cellular terminal to measure received signal strengths of selected radio channels;

transferring the received signal strength measurements from said cellular terminal to said telephone base station; and

transferring the received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network.

10. A method according to claim 9 further comprising the step of:

comparing the received signal strength measurements in the wide area cellular network to thereby identify a radio channel having low received signal strength.

11. A method according to claim 9 wherein said controlling step is preceded by the steps of:

transferring identification of the selected radio channels to said base station from said wide area cellular network via said wire telephone network; and

transferring the identification of the selected radio channels from said base station to said cellular terminal.

12. A system for allocating a cellular communications channel for communication between a cellular terminal and a telephone base station, the telephone base station connecting a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of control channels and communications channels within a cellular network spectrum, said allocating system comprising:

means for controlling said cellular terminal to measure received signal strengths of the control channels;

means, responsive to said controlling means, for identifying a set of communications channels associated with a measured control channel having lowest received signal strength;

means, responsive to said identifying means, for causing said cellular terminal to measure received signal strengths of the set of communications channels; and

means, responsive to said causing means, for selecting from said set of communications channels, a communications channel having lowest received signal strength, such that the selected communications channel having lowest received signal strength is used for communication between said cellular terminal and said telephone base station within the local region.

13. A system according to claim 12 wherein said selecting means comprises:

means for determining whether the received signal strength of the communications channel having lowest received signal strength is sufficiently low; and

means, responsive to said determining means, for using the selected communications channel having lowest received signal strength for communication between said cellular terminal and said telephone base station within the local region, if the received signal strength of the channel having lowest received signal strength is sufficiently low.

14. A system according to claim 12 wherein said identifying means comprises:

means for transferring the control channel received signal strength measurements from said cellular terminal to said telephone base station;

means for transferring the control channel received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network;

means for causing said wide area cellular network to identify a measured control channel having lowest received signal strength; and

means for causing the wide area cellular network to identify the set of communications channels associated with the measured control channel having lowest received signal strength.

15. A system according to claim 14 wherein said means for causing said cellular terminal to measure received signal strengths of the set of communications channels further comprises:

means for transferring the identified set of communications channels to said base station from said wide area cellular network via said wire telephone network; and

means for transferring the identified set of communications channels from said base station to said cellular terminal.

16. A system according to claim 15 wherein said selecting means comprises:

means for transferring the communication channel received signal strength measurements from said cellular terminal to said telephone base station;

means for transferring the communication channel received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network;

means for causing said wide area cellular network to identify a measured communication channel having lowest received signal strength; and

means for causing the wide area cellular network to select from the set of communications channels, a communications channel having lowest received signal strength.

17. A system according to claim 16 wherein said selecting means further comprises:

means for transferring identification of the selected communications channel to said base station from said wide area cellular network via said wire telephone network; and

means for transferring the identification of the selected communications channel from said base station to said cellular terminal.

18. A measuring system for a cellular terminal and a telephone base station, the telephone base station connecting a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of radio channels within a cellular network spectrum, said measuring system comprising:

means for controlling said cellular terminal to measure received signal strengths of selected radio channels;

first means, responsive to said controlling means, for transferring the received signal strength measurements from said cellular terminal to said telephone base station; and

second means, responsive to said first means, for transferring the received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network.

19. A system according to claim 18 wherein said wide area cellular network further comprises:

means for comparing the received signal strength measurements to thereby identify a communications channel having low received signal strength.

20. A system according to claim 18 wherein said controlling means further comprises:

means for transferring identification of the selected radio channels to said base station from said wide area cellular network via said wire telephone network; and

means for transferring the identification of the selected radio channels from said base station to said cellular terminal.

21. A radio personal communications system comprising:

a wide area cellular network including a plurality of cells which use a plurality of control channels and communications channels within a cellular network spectrum;

a cellular terminal;

a telephone base station, the telephone base station connecting a wire telephone network to the cellular terminal within a local region of a cell;

said cellular terminal comprising means for measuring received signal strengths of the control channels;

said wide area cellular network including means for identifying a set of communications channels associated with a measured control channel having low received signal strength, for using at least one of the communications channels for communication between said cellular terminal and said telephone base station within the local region.

22. A system according to claim 21 wherein said wide area cellular network further comprises means for directing said cellular terminal to measure received signal strengths of the set of communications channels;

said cellular terminal further comprising means, responsive to said identifying means, for selecting from said set of communications channels, a communications channel having low received signal strength, and for using the selected communications channel having lowest received signal strength for communication between said cellular terminal and said telephone base station within the local region.

23. A system according to claim 22 wherein said wide area cellular network further comprises:

means for determining whether the received signal strength of the communications channel having lowest received signal strength is sufficiently low; and

means for directing said cellular terminal to measure received signal strengths of a next set of communications channels associated with a measured control channel having next lowest received signal strength, if the received signal strength of the channel having lowest received signal strength is not sufficiently low.

24. A system according to claim 21 wherein said base station comprises:

means for receiving the control channels received signal strength measurements from said cellular terminal; and

means for transferring the control channel received signal strength measurements from the telephone base station to the wide area cellular network via said wire telephone network.

25. A system according to claim 24 wherein said base station further comprises:

means for receiving the identified set of communications channels from said wide area cellular network via said wire telephone network; and

means for transferring the identified set of communications channels from said base station to said cellular terminal.

26. A system according to claim 22 wherein said base station further comprises:

means for receiving the communication channel received signal strength measurements from said cellular terminal; and

means for transferring the communication channel received signal strength measurements to the wide area cellular network via said wire telephone network.

27. A system according to claim 26 wherein said base station further comprises:

means for receiving identification of the selected communications channel from said wide area cellular network via said wire telephone network; and

means for transferring the identification of the selected communications channel to said cellular terminal.

28. A system according to claim 21 wherein said base station further comprises means for mechanically coupling said cellular terminal thereto;

and

means for transferring electrical signals, electromagnetic signals or acoustic signals between the telephone base station and the cellular terminal which is mechanically coupled thereto.

29. A measuring method for a cellular terminal and a telephone base station, the telephone base station connecting a wire telephone network to the cellular terminal within a local region in a cell of a wide area cellular network which uses a plurality of radio channels within a cellular network spectrum, said measuring method comprising the steps of:

transferring signal strength measuring instructions from said wide area cellular network to said telephone base station via said wire telephone network;

transferring said signal strength measuring instructions from said telephone base station to said cellular terminal;

controlling said cellular terminal to measure received signal strengths of selected radio channels in said local region according to said signal strength measuring instructions; and

identifying at least one radio channel for communication between said telephone base station and said cellular terminal in said local region, based upon the measured received signal strengths of the selected radio channels in the local region.

30. A method according to claim 29 wherein the following step is performed after said controlling step:

transferring the measured received signal strengths from said cellular terminal to said telephone base station.

31. A method according to claim 30 wherein the following step is performed after said step of transferring the measured received signal strengths from said cellular terminal to said telephone base station:

transferring the measured received signal strengths from said telephone base station to said wide area cellular network via said wire telephone network.

32. A method according to claim 31 wherein said identifying step is performed by said wide area cellular network.

33. A method according to claim 32 wherein said identifying step is followed by the step of:

transferring identification of the at least one radio channel from said wide area cellular network to said telephone base station via said wire telephone network.

34. A method according to claim 33 wherein said step of transferring identification of the at least one radio channel from said wide area cellular network to said telephone base station via said wire telephone network is followed by the step of transferring said identification of the at least one radio channel from said telephone base station to said cellular terminal.