Method and apparatus for assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radio telephones in a cellular radiotelephone communications system

• US 4,485,486 A
• Filed: 02/06/1984
• Issued: 11/27/1984
• Est. Priority Date: 08/03/1982
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Puhl, Larry C., Webb, Ronald J.
• Primary Examiner(s): Bookbinder, Marc E.
• Application Number:
  US06/576,805
• Time in Patent Office: 295 Days
• Field of Search: 455/33, 455/34, 455/53, 455/54, 455/56, 455/62, 179/2 EB
• US Class Current: 455/450
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence
• CPC Class Codes: H04W 16/24 Cell structures
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A unique method and apparatus for efficiently assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radiotelephones in a cellular communications system is described. Each cell includes a base station radio having a signalling channel and a plurality of voice channels, and a base site controller adapted to utilize the methods embodying the present invention for controlling communications paths to mobile and portable radiotelephones. The base station radios include a signalling transceiver operable on the signalling channel, a plurality of voice transceivers each operable on a voice channel, and a scanning receiver for sampling the signal strength of active radiotelephones. Transmitters of signalling transceivers and voice transceivers are combined and coupled to an omnidirectional antenna; and the receivers of the signalling transceiver, voice transceivers and scanning receiver are couplable to one or more of six sector antennas. In practicing the methods of the present invention, the microprocessor controlled base site controller maintains high quality communications paths to mobile and portable radiotelephones by periodically monitoring their signal strength and when signal strength degradations are detected, either changing the base station sector antennas coupled to voice transceivers, increasing or decreasing radiotelephone power output, or handing radiotelephones off to another cell.

Claims

1. A method of controlling radio frequency (RF) signal communications paths to remote stations of a communications system, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said method performed by each of said cell control means comprising the steps of;

(a) assigning one of the RF signal channels to each requesting remote station;

(b) sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one;

(c) selecting for each such remote station the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means;

(d) comparing the magnitude of the largest sampled signal strength of the selected antenna means for each such remote station to a predetermined magnitude; and

(e) requesting at least one other cell control means to sample the signal strength of a remote station when the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is less than the predetermined magnitude.

2. The method according to claim 1, further including the step of periodically repeating said steps (b), (c), (d) and (e).

3. The method according to claim 1, wherein said step (b) includes the step of selecting for each antenna means the sampled signal strength having the largest magnitude, said step (c) selecting for each such remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

4. The method according to claim 1, further including the steps of:

(f) at a first cell control means, transmitting the magnitude of the largest sampled signal strength received from a remote station by the selected antenna means to at least one other cell control means;

(g) at said one other cell control means, sampling M times the strength of the RF signal received by each antenna means from said remote station, where M is an integer number greater than one;

(h) at said one other cell control means, selecting for said remote station the antenna means for which one of its M sampled signal strengths has a magnitude greater than the magnitude of any of the M sampled signal strengths for all other antenna means;

(i) at said one other cell control means, comparing the magnitude of the largest sampled signal strength of the selected antenna means for said remote station to the magnitude of the largest sampled signal strength transmitted from said first cell control means; and

(j) at said one other cell control means, assigning said remote station an RF signal channel if the largest sampled signal strength of the selected antenna means for said remote station is at least a predetermined amount greater than the largest sampled signal strength transmitted from said first cell control means.

5. The method according to claim 4, wherein said step (b) includes the step of selecting for each antenna means the sampled signal strength having the largest magnitude, said step (c) selecting for each such remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

6. The method according to claim 4 or 5, wherein said step (g) includes the step of selecting for each antenna means the sampled signal strength having the largest magnitude, said step (h) selecting for said remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

7. The method according to claim 4, wherein said step (i) further includes the step of adding a predetermined number to the sampled signal strength transmitted from said first cell control means, said step (i) comparing the magnitude of the largest sampled signal strength of the selected antenna means to the magnitude of the sum of the predetermined number and the largest sampled signal strength transmitted from said first cell control means.

8. The method according to claim 1, further including the steps of:

(f) at a first cell control means, transmitting the magnitude of the largest sampled signal strength received from a remote station by the selected antenna means to at least one other cell control means;

(g) at said one other cell control means, sampling M times the strength of the RF signal received by eacn antenna means from said remote station, where M is an integer number greater than one;

(h) at said one other cell control means, selecting for said remote station the antenna means for which one of its M sampled signal strengths has a magnitude greater than the magnitude of any of the M sampled signal strengths for all other antenna means;

(i) at said one other cell control means, comparing the magnitude of the largest sampled signal strength of the selected antenna means for said remote station to a predetermined magnitude; and

(j) at said one other cell control means, assigning said remote station an RF signal channel if the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is at least a predetermined amount greater than the predetermined magnitude.

9. The method according to claim 1, wherein said step (c) further includes the step of selecting for each such remote station a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means.

10. A method of controlling radio frequency (RF) signal communications paths to remote stations of a communications system, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said method performed by each of said cell control means comprising the steps of;

(a) assigning one of the RF signal channels to each requesting remote station;

(b) sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one;

(c) selecting for each such remote station the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means;

(d) comparing the magnitude of the largest sampled signal strength of the selected antenna means for each such remote station to a predetermined magnitude; and

(e) transmitting a control signal to a remote station for causing said remote station to increase the strength of its transmitted RF signal when the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is less than the predetermined magnitude.

11. The method according to claim 10, further including the step of periodically repeating said steps (b), (c), (d) and (e).

12. The method according to claim 10, wherein said step (b) includes the step of selecting for each antenna means the sampled signal strength having the largest magnitude, said step (c) selecting for each remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

13. The method according to claim 10, wherein said step (c) further includes the step of selecting for each such remote station a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means.

14. A method of controlling radio frequency (RF) signal communications paths to remote stations of a communications system, said communications system includ:

ng a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said method performed by each of said cell control means comprising the steps of;

(a) assigning one of the RF signal channels to each requesting remote station;

(b) sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one;

(c) selecting for each such remote station the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means;

(d) comparing the magnitude of the largest sampled signal strength of the selected antenna means for each such remote station to a predetermined magnitude; and

(e) transmitting a control signal to a remote station for causing said remote station to decrease the strength of its transmitted RF signal when the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is greater than the predetermined magnitude.

15. The method according to claim 14, further including the step of periodically repeating said steps (b), (c), (d) and (e).

16. The method according to claim 14, wherein said step (b) includes the step of selecting for each antenna means the sampled signal strength having the largest magnitude, said step (c) selecting for each such remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

17. The method according to claim 14, wherein said step (c) further includes the step of selecting for each such remote station a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means.

18. A method of controlling radio frequency (RF) signal communications paths to remote stations of a communications system, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated first and second groups of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies; and

at least first and second non-adjacent cells being allocated the same first and second groups of duplex RF signal channels;

said method performed by said cell control means of said first and second cells comprising the steps of;

(a) at said first cell, assigning one of said first group of RF signal channels to a requesting remote station, and assigning one of said second group of RF signal channels to a requesting remote station when all RF signal channels of said first group have been assigned; and

(b) at said second cell, assigning one of said second group of RF signal channels to a requesting remote station, and assigning one of said first group of RF signal channels to a requesting remote station when all RF signal channels of said second group have been assigned.

19. The method according to claim 18, further including the steps of:

(c) at said first cell, re-assigning channels of said first group as they become available before assigning or re-assigning channels of said second group; and

(d) at said second cell, reassigning channels of said second group as they become available before assigning or reassigning channels of said first group.

20. Control means for a base station of a radio frequency (RF) signal communications system providing communications to remote stations, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means and a base station, each base station including RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said cell control means comprising;

means for assigning one of the RF signal channels to each requesting remote station;

means for sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one;

means for selecting for each such remote station the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means;

means for comparing the magnitude of the largest sampled signal strength of the selected antenna means for each such remote station to a predetermined magnitude; and

means for requesting at least one other cell control means to sample the signal strength of a remote station when the magnitude of the largest sampled signal strength of the selected antenna means is less than the predetermined magnitude.

21. The cell control means according to claim 20, wherein said sampling means includes means for converting analog samples to digital samples.

22. The cell control means according to claim 20, wherein said sampling means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said selecting means selecting for each such remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

23. The cell control means according to claim 20, further including means for communicating sampled signal strengths between a first cell control means and a second cell control means, and further comprising:

at said first cell control means, means for transmitting the magnitude of the largest sampled signal strength received from a remote station by the selected antenna means to said second cell control means;

at said second cell control means, means for sampling M times the strength of the RF signal received by each antenna means from said remote station, where M is an integer number greater than one;

at said second cell control means, means for selecting for said remote station the antenna means for which one of its M sampled signal strengths has a magnitude greater than the magnitude of any of the M sampled signal strengths for all other antenna means;

at said second cell control means, means for comparing the magnitude of the largest sampled siqnal strength of the selected antenna means for said remote station to the magnitude of the largest sampled signal strength transmitted from said first cell control means; and

at said second cell control means, means for assigning said remote station an RF signal channel if the largest sampled signal strength of the selected antenna means for said remote station is at least a predetermined amount greater than the largest sampled signal strength transmitted from said first cell control means.

24. The cell control means according to claim 23, wherein said sampling means of said first cell control means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said selecting means of said first cell control means selecting for each such remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

25. The cell control means according to claim 23 or 24, wherein said sampling means of said second cell control means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said selecting means of said second cell control means selecting for said remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

26. The cell control means according to claim 23, wherein said comparing means of said second cell control means further includes means for adding a predetermined number to the sampled signal strength transmitted from said first cell control means, said comparing means of said second cell control means comparing the magnitude of the largest sampled signal strength of the selected antenna means to the magnitude of the sum of the predetermined number and the largest sampled signal strength transmitted from said first cell control means.

27. The cell control means according to claim 20, further including means for communicating sampled signal strengths between a first cell control means and a second cell control means, and further comprising:

at said first cell control means, means for transmitting the magnitude of the largest sampled signal strength received from a remote station by the selected antenna means to said second cell control means;

at said second cell control means, means for sampling M times the strength of the RF signal received by each antenna means from said remote station, where M is an integer number greater than one;

at said second cell control means, means for selecting for said remote station the antenna means for which one of its M sampled signal strengths has a magnitude greater than the magnitude of any of the M sampled signal strengths for all other antenna means;

at said second cell control means, means for comparing the magnitude of the largest sampled signal strength of the selected antenna means for said remote station to a predetermined magnitude; and

at said second cell control means, means for assigning said remote station an RF signal channel if the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is at least a predetermined amount greater than the predetermined magnitude.

28. The cell control means according to claim 20, wherein said selecting means further includes means for selecting for each such remote station a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means, and means for combining the RF signals received by said selected first and second antenna means to provide a composite signal.

29. Control means for a base station of a radio frequency (RF) signal communications system providing communications to remote stations, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means and a base station, each base station including RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said cell control means comprising;

means for assigning one of the RF signal channels to each requesting remote station;

means for sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one;

means for selecting for each such remote station the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means;

means for comparing the magnitude of the largest sampled signal strength of the selected antenna means for each such remote station to a predetermined magnitude; and

means for transmitting a control signal to a remote station for causing said remote station to increase the strength of its transmitted RF signal when the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is less than the predetermined magnitude.

30. The cell control means according to claim 29, wherein said sampling means includes means for converting analog samples to digital samples.

31. The cell control means according to claim 29, wherein said sampling means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said selecting means selecting for each remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

32. The cell control means according to claim 29, wherein said selecting means further includes means for selecting for each such remote station a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means, and means for combining the RF signals received by said selected first and second antenna means to provide a composite signal.

33. Control means for a base station of a radio frequency (RF) signal communications system providing communications to remote stations, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means and a base station, each base station including RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said cell control means comprising;

means for assigning one of the RF signal channels to each requesting remote station;

means for sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one;

means for selecting for each such remote station the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means;

means for comparing the magnitude of the largest sampled signal strength of the selected antenna means for each such remote station to a predetermined magnitude; and

means for transmitting a control signal to a remote station for causing said remote station to decrease the strength of its transmitted RF signal when the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is greater than the predetermined magnitude.

34. The cell control means according to claim 33, wherein said sampling means includes means for converting analog samples to digital samples.

35. The cell control means according to claim 33, wherein said sampling means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said selecting means selecting for each such remote station the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

36. The cell control means according to claim 33, wherein said selecting means further includes means for selecting for each such remote station a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means, and means for combining the RF signals received by said selected first and second antenna means to provide a composite signal.

37. Control means for a base station of a radio frequency (RF) signal communications system providing communications to remote stations, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated first and second groups of duplex RF signal channels, each cell further including cell control means and a base station, each base station including RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies and RF signal receiving means coupled to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies, and at least first and second non-adjacent cells being allocated the same first and second groups of duplex RF signal channels;

said first and second cell control means of said first and second cells, respectively, comprising;

said first cell control means including means for assigning one of said first group of RF signal channels to a requesting remote station, and means for assigning one of said second group of RF signal channels to a requesting remote station when all RF signal channels of said first group have been assigned; and

said second cell control means including means for assigning one of said second group of RF signal channels to a requesting remote station, and means for assigning one of said first group of RF signal channels to a requesting remote station when all RF signal channels of said second group have been assigned.

38. The first and second cell control means according to claim 37, wherein:

said first cell control means further includes means for reassigning channels of said first group as tney ecome available before assigning or reassigning cnannels of said second group; and

said second cell control means further includes means for reassigning channels of said second group as they become available before assigning or reassigning channels of said first group.

39. A method of controlling radio frequency (RF) signal communications paths to remote stations of a communications system, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and a plurality of RF signal receiving means each couplable to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said method performed by each of said cell control means comprising the steps of;

(a) assigning one of the RF signal channels and one of the plurality of RF signal receiving means to each requesting remote station;

(b) periodically sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one; and

(c) coupling the assigned RF signal receiving means for each such remote station to the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means.

40. The method according to claim 39, further including the steps of:

(d) comparing for each such remote station the magnitude of the largest sampled signal strength of the coupled antenna means to a predetermined magnitude for each repeated step (b); and

(e) transmitting a control signal to a remote station for causing said remote station to increase the strength of its transmitted RF signal when the largest sampled signal strength of the coupled antenna means for said remote station is less than the predetermined magnitude for at least two repeated steps (b).

41. The method according to claim 39, further including the steps of:

(d) comparing for each such remote station the magnitude of the largest sampled signal strength of the coupled antenna means to a predetermined magnitude for each repeated step (b); and

(e) requesting at least one other cell control means to sample the signal strength of a remote station when the largest sampled signal strength of the coupled antenna means for said remote station is less than the predetmined magnitude for at least two repeated steps (b).

42. The method according to claim 39, further including the steps of:

(d) comparing for each such remote station the magnitude of the largest sampled signal strength of the coupled antenna means to a predetermined magnitude for each repeated step (b); and

(e) transmitting a control signal to a remote station for causing said remote staton to decrease the strength of its transmitted RF signal when the largest sampled signal strength of the coupled antenna means for said remote station is greater than the predetermined magnitude for at least two repeated steps (b).

43. Control means for a base station of a radio frequency (RF) signal communications system providing communications to remote stations, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means and a base station, each base station including RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies and a plurality of RF signal receiving means each couplable to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said cell control means comprising;

means for assigning one of the RF signal channels and one of the plurality of RF signal receiving means to each requesting remote station;

means for periodically sampling N times the strength of the RF signal received by each antenna means from each remote station assigned an RF signal channel, where N is an integer number greater than one; and

means for coupling the assigned RF signal receiving means for each such remote station to the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means.

44. The cell control means according to claim 43, wherein said sampling means includes means for converting analog samples to digital samples.

45. The cell control means according to claim 43, wherein said sampling means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said coupling means coupling the assigned RF signal receiving means for each such remote station to the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

46. The cell control means according to claim 43, wherein said coupling means further includes means for coupling the assigned RF signal receiving means for each such remote station to a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means.

47. The control means according to claim 43, further including:

means for comparing for each such remote station the magnitude of the largest sampled signal strength of the coupled antenna means to a predetermined magnitude; and

means for transmitting a control signal to a remote station for causing said remote station to increase the strength of its transmitted RF signal when the magnitude of the largest sampled signal strength of the coupled antenna means for said remote station is less than the predetermined magnitude for at least two different sets of N sampled signal strengths.

48. The control means according to claim 43, further including:

means for comparing for each such remote station the magnitude of the largest sampled signal strength of the coupled antenna means to a predetermined magnitude; and

means for transmitting a control signal to a remote station for causing said remote staton to decrease the strength of its transmitted RF signal when the magnitude of the largest sampled signal strength of the coupled antenna means for said remote station is greater than the predetermined magnitude for at least two different sets of N sampled signal strengths.

49. The control means according to claim 43, further including:

means for comparing for each such remote station the magnitude of the largest sampled signal strength of the coupled antenna means to a predetermined magnitude; and

means for requesting at least one other cell control means to sample the signal strength of a remote station when the magnitude of the largest sampled signal strength of the coupled antenna means for said remote station is less than the predetmined magnitude for at least two different sets of N sampled signal strengths.

50. The cell control means according to claim 43, further including means for communicating sampled signal strengths between a first cell control means and a second cell control means, and further comprising:

at said first cell control means, means for transmitting the magnitude of the largest sampled signal strength received from a remote station by the selected antenna means to said second cell control means;

at said second cell control means, means for sampling M times the strength of the RF signal received by each antenna means from said remote station, where M is an integer number greater than one;

at said second cell control means, means for selecting for said remote station the antenna means for which one of its M sampled signal strengths has a magnitude greater than the magnitude of any of the M sampled signal strengths for all other antenna means;

at said second cell control means, means for comparing the magnitude of the largest sampled signal strength of the selected antenna means for said remote station to the magnitude of the largest sampled signal strength transmitted from said first cell control means; and

at said second cell control means, means for assigning said remote station an RF signal channel if the largest sampled signal strength of the selected antenna means for said remote station is at least a predetermined amount greater than the largest sampled signal strength transmitted from said first cell control means.

51. The cell control means according to claim 50, wherein said sampling means of said first cell control means includes means for selecting for each antenna means the sampled signal strength having the largest magnitude, said coupling means of said first cell control means coupling the assigned RF signal receiving means for each such remote station to the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

52. The cell control means according to claim 50 or 51, wherein said sampling means of said second cell control means includes means for selecting for each antenna means the sampled signal strength having the larges:

magnitude, said coupling means of said second cell control means coupling the assigned RF signal receiving means for said remote station to the antenna means for which the selected sampled signal strength has a magnitude greater than the selected sampled signal strength for all other antenna means.

53. The cell control means according to claim 50, wherein said comparing means of said second cell control means further includes means for adding a predetermined number to the sampled signal strength transmitted from said first cell control means, said comparing means of said second cell control means comparing the magnitude of the largest sampled signal strength of the selected antenna means to the magnitude of the sum of the predetermined number and the largest sampled signal strength transmitted from said first cell control means.

54. The cell control means according to claim 43, further including means for communicating sampled signal strengths between a first cell control means and a second cell control means, and further comprising:

at said first cell control means, means for transmitting the magnitude of the largest sampled signal strength received from a remote station by the selected antenna means to said second cell control means;

at said second cell control means, means for sampling M times the strength of the RF signal received by each antenna means from said remote station, where M is an integer number greater than one;

at said second cell control means, means for selecting for said remote station the antenna means for which one of its M sampled signal strengths has a magnitude greater than the magnitude of any of the M sampled signal strengths for all other antenna means;

at said second cell control means, means for comparing the magnitude of the largest sampled signal strength of the selected antenna means for said remote station to a predetermined magnitude; and

at said second cell control means, means for assigning said remote station an RF signal channel if the magnitude of the largest sampled signal strength of the selected antenna means for said remote station is at least a predetermined amount greater than the predetermined magnitude.

55. A method of controlling radio frequency (RF) signal communications paths to remote stations of a communications system, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and a plurality of RF signal receiving means each couplable to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said method performed by each of said cell control means comprising the steps of;

(a) assigning one of the RF signal channels and one of the plurality of RF signal receiving means to each requesring remote station;

(b) incrementing timers for each remote station assigned an RF signal channel by a predetermined amount at successive time intervals;

(c) re-assigning RF signal channels that were previously assigned to remote stations whose timer has a magnitude greater than a predetermined maximum magnitude;

(d) selecting a remote station whose transmitted RF signal is being received and whose timer has a magnitude greater than a predetermined minimum magnitude;

(e) sampling N times the strength of the RF signal received by each antenna means from said selected remote station, where N is an integer number greater than one; and

(f) resetting the timer of said selected remote station to a predetermined initial magnitude.

56. The method according to claim 55, further including the step of:

(g) coupling the assigned RF signal receiving means for said selected remote station to the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means.

57. The method according to claim 56, further including the step of:

(h) coupling the assigned RF signal receiving means for said selected remote station to a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means.

58. The method according to claim 55, wherein at least one remote station has voice-operated transmitting means which transmits an RF signal substantially only when voice signals are applied to it;

said step (c) comprising the steps of;

(i) re-assigning RF signal channels that were previously assigned to remote stations not having voice-operated transmitting means and whose timer has a magnitude greater than a predetermined maximum magnitude; and

(ii) transmitting a control signal to a remote station, having voice-operated transmitting means, for causing the remote station to transmit an RF signal for a predetermined time interval when its timer has a magnitude greater than the predetermined maximum magnitude.

59. The method according to claim 58, wherein said step (c) further includes the step of:

(iii) re-assigning RF signal channels that were previously assigned to remote stations having voice-operated transmitting means and whose timer has a magnitude that is a predetermined amount greater than the predetermined maximum magnitude.

60. The method according to claim 55, further including the step of:

(g) repeating said steps (c), (d), (e) and (f) at successive time intervals greater than the timer interval in step (b).

61. The method according to claim 58 or 59, wherein said step (ii) comprises transmitting a control signal to a remote station, having voice-operated transmitting means, for causing the remote station to transmit an RF signal for a predetermined time interval and causing the remote station to increase the strength of its transmitted RF signal, when its timer has a magnitude greater than the predetermined maximum magnitude.

62. Control means for a base station of a radio frequency (RF) signal communications system providing communications to remote stations, said communications system including a plurality of cells partitioned from a geographical area;

each cell allocated a predetermined number of duplex RF signal channels, and each cell including cell control means, RF signal transmitting means for transmitting RF signals at a plurality of signal frequencies, and a plurality of RF signal receiving means each couplable to a plurality of antenna means for receiving RF signals at a plurality of signal frequencies;

said cell control means comprising;

means for assigning one of the RF signal channels and one of the plurality of RF signal receiving means to each requesting remote station;

means for incrementing timers for each remote station assigned an RF signal channel by a predetermined amount at successive time intervals;

means for re-assigning RF signal channels that were previously assigned to remote stations whose timer has a magnitude greater than a predetermined maximum magnitude;

means for selecting a remote station whose transmitted RF signal is being received and whose timer has a magnitude greater than a predetermined minimum magnitude;

means for sampling N times the strength of the RF signal received by each antenna means from said selected remote station, where N is an integer number greater than one; and

means for resetting the timer of said selected remote station to a predetermined initial magnitude.

63. The cell control means according to claim 62, further including:

means for coupling the assigned RF signal receiving means for said selected remote station to the antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for all other antenna means.

64. The cell control means according to claim 63, further including:

means for coupling the assigned RF signal receiving means for said selected remote station to a second antenna means for which at least one of its N sampled signal strengths has a magnitude greater than the magnitude of any of the N sampled signal strengths for the remaining ones of said other antenna means.

65. The cell control means according to claim 62, wherein at least one remote station has voice-operated transmitting means which transmits an RF signal substantially only when voice signals are applied to it;

said re-assigning means comprising;

means for re-assigning RF signal channels that were previously assigned to remote station not having voice-operated transmitting means and whose timer has a magnitude greater than a predetermined maximum magnitude; and

means for transmitting a control signal to a remote station, having voice-operated transmitting means, for causing the remote station to transmit an RF signal for a predetermined time interval when its timer has a magnitude greater than the predetermined maximum magnitude.

66. The cell control means according to claim 64, wherein said re-assigning means further includes:

means for re-assigning RF signal channels that were previously assigned to remote stations having voice-operated transmitting means and whose timer has a agnitude that is a predetermined amount greater than the predetermined maximum magnitude.

67. The cell control means according to claim 65 or 66, wherein said control signal transmitting means comprises means for transmitting a control signal to a remore station, having voice-operated transmitting means, for causing the remote station to transmit an RF signal for a predetermined time interval and causing the remote station to increase the strength of its transmitted RF signal, when its timer has a magnitude greater than the predetermined maximum magnitude.