Cell of preference check in a communications network

• US 5,722,070 A
• Filed: 04/12/1995
• Issued: 02/24/1998
• Est. Priority Date: 04/12/1995
• Status: Expired due to Fees

• Current Assignee: Uniden America Corporation (Cornwall Capital Management LP)
• Original Assignee: Uniden America Corporation (Cornwall Capital Management LP)
• Inventors: Alford, George Christian
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US08/421,057
• Time in Patent Office: 1,049 Days
• Field of Search: 455/33.1, 455/33.2, 455/33.3, 455/33.4, 455/53.1, 455/54.1, 455/54.2, 455/56.1, 455/422, 455/425, 455/434, 455/435, 455/436, 455/437, 455/515, 455/517, 455/525, 379/59, 379/60, 379/63
• US Class Current: 455/425
• CPC Class Codes: H04W 48/20 Selecting an access point

Abstract

An apparatus and a method for checking the cell of preference in a multi-cell communications system is disclosed. While a communications receiver or transceiver is currently receiving an acceptable signal from a current cell, a cell of preference is checked for a brief period of time for a cell beacon. If a cell beacon is received, the receiver or transceiver continues to receive the cell of preference. If not, the receiver or transceiver returns to the current host cell. The preferred embodiment is directed to a land mobile radio system which broadcasts cell ID codes at periodic intervals. In the preferred embodiment, the transceiver checks-in to the cell of preference to announce its presence such that future communications can be directed to the radio after check-in.

Claims

1. A communications receiver comprising:

a receiver for receiving a first signal that comprises a cell beacon, and for receiving a second signal;

a controller coupled to said receiver and operable to enable said receiver to receive either of said first or said second signals, said controller further operable to decode said cell beacon;

a memory coupled to said controller and having an indicia of cell of preference stored therein that corresponds to said cell beacon;

a counter coupled to said controller for counting cell beacons received on said first signal, and wherein

said controller is operable, while said receiver is enabled to receive said second signal, to recall said indicia of cell of preference and enable said receiver to receive said first signal for a first period of time, and wherein during said first period of time said counter counts the number of cell beacons received on said first signal, and upon accumulating a cell beacon count threshold by said counter within said first period of time, said controller enabling said receiver to receive said first signal for longer than said first period of time.

2. The communications receiver of claim 1, and wherein said controller is operable to periodically recall said indicia of cell of preference and enable said receiver to receive said first signal for said first period of time.

3. The communications receiver of claim 1, and wherein said controller is operable to decode a cell beacon that is in encoded as digital data.

4. A communications receiver comprising:

a receiver for receiving a first signal that comprises a cell ID code, and for receiving a second signal;

a controller coupled to said receiver and operable to enable said receiver to receive either of said first or said second signals, said controller further operable to decode said cell ID code;

a memory coupled to said controller and having at least a first indicia of cell ID code stored therein that corresponds to said cell ID code;

a counter coupled to said controller for counting cell ID codes received on said first signal, and wherein

said controller is operable, while said receiver is enabled to receive said second signal, to recall said first indicia of cell of preference and enable said receiver to receive said first signal for a first period of time, and wherein during said first period of time said counter counts the number of cell ID codes received on said first signal, and upon accumulating a cell ID code count threshold by said counter within said first period of time, said controller enabling said receiver to receive said first signal for longer than said first period of time.

5. The communications receiver of claim 4, and wherein said controller is operable to decode a cell ID code that is in encoded as digital data.

6. The communications receiver of claim 4, and wherein:

said memory comprises a plurality of storage locations for storing a plurality of indicia of cell ID codes, and wherein

said controller is operable to select at least one of said plurality of indicia of cell ID codes.

7. The communications receiver of claim 6, further comprising:

an actuator, coupled to said controller, for selecting one of said plurality of indicia of cell ID codes, and wherein

actuation of said actuator cases said controller to select one of said plurality of indicia of cell ID codes.

8. A radio transceiver comprising:

a frequency agile receiver for receiving a plurality of radio signals, wherein at least one of said plurality of radio signal comprises a cell beacon;

a controller coupled to said receiver and operable to control the frequency of reception of said receiver and to enable said receiver to receive either of a first radio signal or a second radio signal, said controller further operable to decode said cell beacon;

a memory coupled to said controller and having a plurality of storage locations for storing a plurality of indicia of cell of preferences;

a counter coupled to said controller for counting cell beacons received on said first signal, and wherein

said controller is operable, while said receiver is enabled to receive said second radio signal, to recall one of said plurality of indicia of cell of preference and enable said receiver to receive said first radio signal for a first period of time, and wherein during said first period of time said counter counts the number of cell beacons received on said first signal, and upon accumulating a cell beacon count threshold by said counter within said first period of time, said controller enabling said receiver to receive said first signal for longer than said first period of time.

9. The radio transceiver of claim 8, further comprising:

a first actuator, coupled to said controller, wherein actuation thereof causes said controller to recall one of said plurality of indicia of cell of preferences from said memory and said controller further enables said receiver to receive said first radio signal corresponding to said recalled one of said plurality of indicia of cells of preference.

10. The radio transceiver of claim 8, further comprising:

a second actuator, coupled to said controller, for selecting a call destination, and wherein

said controller recalls one of said plurality of indicia of cells of preference based on a selected call destination.

11. The radio transceiver of claim 8, and wherein said controller is operable to decode a digitally encoded cell beacon.

12. The radio transceiver of claim 8, and wherein said transceiver is a trunking radio transceiver.

13. A method of receiving a signal from a cell of preference in a communications receiver wherein a first cell transmits a first signal comprising a cell beacon, and a second cell transmits a second signal, and wherein the communications receiver comprises a receiver for receiving the first and second signals, and a controller for enabling the receiver to receive either of the first or second signals, and the controller is operable to detect the cell beacon, and, wherein the communications receiver comprises a memory for storing an indicia of cell of preference that corresponds to the cell beacon, and further comprises a counter for counting the number of cell beacons received on the first signal, the method comprising the steps of:

while the receiver is enabled to receive the second signal, recalling the indicia of cell of preference;

enabling the receiver to receive the first signal for a first period of time;

counting the number of cell beacons received during said first period of time, and

upon accumulating a cell beacon count threshold by the counter within said first period of time, enabling the receiver to receive the first signal for longer than said first period of time.

14. The method of claim 13, further comprising the step of:

periodically recalling the indicia of cell of preference and enabling the receiver to receive the first signal for a first period of time.

15. The method of claim 13, and wherein the cell beacon comprises digitally encoded data.

16. A method of receiving a signal from a cell of preference in a communications receiver wherein a first cell transmits a first signal comprising a first cell ID code, and a second cell transmits a second signal, and wherein the communications receiver comprises a receiver for receiving the first and second signals, and a controller for enabling the receiver to receive either of the first or second signals, and the controller is operable to detect a first cell ID code, and, wherein the communications receiver comprises a memory having at least one storage location for storing a second cell ID code that corresponds to a cell of preference, and further comprises a counter for counting the number of first cell ID codes received on the first signal, the method comprising the steps of:

while the receiver is enabled to receive the second signal, recalling the second cell ID code;

enabling the receiver to receive the first signal for a first period of time;

detecting the second cell ID code during the first period of time;

comparing said first cell ID code to said second cell ID code and upon finding a correspondence therebetween;

counting the number of corresponding first and second cell ID codes received during said first period of time, and

upon accumulating a corresponding cell ID code count threshold by the counter within said first period of time, enabling the receiver to receive the first signal for longer than said first period of time.

17. The method of claim 16, and wherein the cell ID codes comprise digitally encoded data.

18. The method of claim 16, wherein the memory comprises a plurality of storage locations for storing a plurality of cell ID codes, and further comprising the steps of:

selecting said second cell ID code from said plurality of cell ID codes.

19. The method of claim 18 wherein said communications receiver comprises an actuator, coupled to said controller, for selecting said second cell ID code form the plurality of cell ID codes, by a user, and further comprising the step of:

selecting, by the user, the second cell ID code from the plurality of cell ID codes.

20. A method of communicating with a cell of preference in a multi-cell radio system wherein each cell comprises a first base transceiver for communicating with a radio transceiver, and each said first base transceiver transmits a radio signal having a cell beacon modulated thereon that identifies its cell, and, wherein the radio transceiver comprises a controller, coupled to a transceiver, for controlling the frequency of operation thereof, and a memory, coupled to the controller, having a plurality of storage locations for storing a plurality of preferred cell ID codes, and the controller is operable to decode cell beacons, and further comprises a counter for counting the number of cell beacons received on the signals, the method comprising the steps of:

monitoring a second cell for receiving a second radio signal;

recalling a preferred cell ID code;

enabling the radio transceiver to receive a first radio signal corresponding to said preferred cell ID code, for a first period of time;

upon receiving the first radio signal and decoding a first cell beacon that corresponds to said preferred cell ID code, during said first period of time;

continuing to receive additional cell beacons and counting the number of cell beacons received during said first period of time that correspond to said preferred cell ID code, and

upon accumulating a cell beacon count threshold by the counter within said first period of time, enabling the radio transceiver to continue to receive said first radio signal beyond said first period of time.

21. The method of claim 20 wherein said communications transceiver comprises an actuator, for actuation by a user, coupled to said controller, for selecting one of said plurality of preferred cell ID codes from said memory, and further comprising the step of:

selecting, by the user, one of said plurality of cell ID code from said memory.

22. The method of claim 20, further comprising the step of:

selecting one of said plurality of preferred cell ID codes based on a user selected call destination.

23. The method of claim 20, wherein at least one cell comprises a plurality of base transceivers operating as a trunking radio system.

24. The method of claim 20 wherein the cell beacon is modulated onto the radio signal as digital data.

25. The method of claim 24 wherein the cell beacon is modulated onto a sub-audible band of the radio signal.

26. The method of claim 24 wherein the cell beacon is modulated onto the radio signal transmitted by a plurality of said base transceiver all of which are within the trunking radio system.

27. The method of claim 24 wherein the cell beacon is modulated onto a radio signal transmitted by a single base transceiver in the trunking radio system.