Spatially-oriented subscriber configuration in a fixed wireless system

• US 5,765,103 A
• Filed: 08/16/1996
• Issued: 06/09/1998
• Est. Priority Date: 08/16/1996
• Status: Expired due to Term

• Current Assignee: Hanger Solutions, LLC (IP Investments Group LLC)
• Original Assignee: Northern Telecom Limited (Nortel Networks Corporation)
• Inventors: Holur, Balaji S., Chang, Chu-Rui, Subramaniam, Gokul V., Hicks, Robert L. Jr., Balachander, Ramanathan, Perez, Louis, Maveddat, Payam, Reece, Christopher S., Zhou, Shun Hua, Marchetti, F. Marco
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Kincaid, Lester G.
• Application Number:
  US08/698,831
• Time in Patent Office: 662 Days
• Field of Search: 455/63, 455/67.1, 455/411, 455/422, 455/423, 455/432, 455/433, 455/434, 455/435, 455/437, 455/443, 455/444, 455/440, 455/446, 455/448, 455/449, 455/450, 455/451, 455/452
• US Class Current: 455/434
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

While setting up a fixed wireless system, each subscriber radiotelephone is configured to a permanent home cell. Subscribers located at the border of a cell may be configured to multiple cells for better coverage. The signal levels at the border subscriber'"'"'s position are received and the mean values of each determined. These mean values are listed in descending order. If the largest mean value is greater than a predetermined threshold, the subscriber is configured to only the home cell. If the largest mean value is within a predetermined range, the second largest mean value is evaluated to determine if it is within the predetermined range. If so, the subscriber is configured to both serving cells. If the second largest mean value is outside the predetermined range, the subscriber is configured to only the home cell.

Claims

1. A method for assigning cellular radio service to a radio unit in a fixed wireless cellular system, the system communicating radio signals through a plurality of cells, the method comprising the steps of:

measuring a mean value signal for a radio signal received from each cell of a set of cells of the cellular system;

determining a largest mean value signal of the measured mean value signals;

determining a second largest mean value signal of the measured mean value signals;

if the largest mean value signal is greater than the predetermined range of mean value signals, assigning the radio unit to a home cell; and

if both the largest and second largest mean value signals are within the predetermined range of mean value signals, assigning the radio unit to both the home cell and a second service cell.

2. The method of claim 1 wherein the predetermined range of mean value signals has an upper threshold and a lower threshold, the lower threshold being the minimum radio sensitivity.

3. The method of claim 2 and further including the step of assigning the radio unit only to the home cell if the largest mean value signal is greater than or equal to the upper threshold.

4. The method of claim 2 and further including the step of preventing a call between the radio unit and the home cell from being established when the largest mean value signal is less than the lower threshold.

5. The method of claim 2 wherein the step of assigning the radio unit to both the home cell and the second cell includes assigning the radio unit when both the largest and second largest mean value signals are less than the upper threshold and greater than or equal to the lower threshold.

6. The method of claim 2 and further including the step of assigning the radio unit only to the home cell if the second largest mean value signal is less than the lower threshold.

7. The method of claim 2 wherein the predetermined range of mean value signals is further comprised of an upper range and a lower range, the upper range bounded by the upper threshold and a minimum threshold, the lower range bounded by a second upper threshold and the lower threshold, the step of assigning the radio unit to both the home and second service cells further comprising the steps of:

comparing the second largest mean value signal to the upper range of the predetermined range of mean value signals;

if the second largest mean value signal is within the upper range, assigning the radio unit to both the home cell and the second service cell; and

if the second largest mean value signal is less than the lower threshold, assigning the radio unit only to the home cell.

8. The method of claim 7 and further including the steps of:

if the second largest mean value signal is within the predetermined range, determining a third largest mean value signal;

if the third largest mean value signal is within the lower range, assigning the radio unit to the home cell, the second service cell, and a third service cell; and

if the third largest mean value signal is less than the lower threshold, assigning the radio unit to the home cell and the second service cell.

9. The method of claim 8 wherein the step of determining the third largest mean value signal includes determining the third largest mean value signal if the second largest mean value signal is less than the upper threshold and greater than or equal to the lower threshold.

10. A method for assigning cellular radiotelephone service to a radiotelephone operating in a fixed wireless cellular system, the radiotelephone communicating with the system via radiotelephone signals, the system comprising a plurality of cells, the method comprising the steps of:

measuring a mean value signal for each radiotelephone signal received from each cell of a set of cells of the cellular system;

determining a largest mean value signal of the measured mean value signals;

if the largest mean value signal is greater than or equal to a maximum threshold, assigning the radiotelephone to use a predetermined home cell of the set of cells;

if the largest mean value signal is less than a minimum threshold, preventing a call between the radiotelephone and the cellular system;

if the largest mean value signal is between the maximum and the minimum thresholds, determining a second largest mean value signal of the measured mean value signals;

if the second largest mean value signal is less than the maximum threshold and greater than or equal to a mid-level threshold, assigning the radiotelephone to use the home cell and a second service cell that generated the radiotelephone signal having the second largest mean value signal;

if the second largest mean value signal is less than the mid-level threshold and greater than or equal to the minimum threshold, determining a third largest mean value signal of the measured mean value signals; and

if the third largest mean value signal is less than the mid-level threshold and greater than or equal to the minimum threshold, assigning the radiotelephone to use the home cell, the second service cell, and a third service cell that generated the radiotelephone signal having the third largest mean value signal.

11. The method of claim 10 wherein the set of cells is comprised of cells within a distance of the radiotelephone such that the radiotelephone can communicate with the cells.

12. The method of claim 10 and further including the step of assigning the radiotelephone to only use the home cell if the second largest mean value signal is less than the minimum threshold.

13. The method of claim 10 wherein the minimum threshold is the minimum radio sensitivity.

14. The method of claim 10 and further including the step of if the third largest mean value signal is less than the minimum threshold, assigning the radiotelephone to only use the home cell and the second service cell.

15. A method for assigning cells to a cellular radiotelephone in a fixed wireless cellular system, the radiotelephone communicating with the cells via radiotelephone signals, the method comprising the steps of:

measuring a mean value for each radiotelephone signal received from each cell of a set of cells of the cellular system, the set of cells being within communication distance of the radiotelephone;

determining a largest mean value of the measured mean values, the largest mean value being measured from a radiotelephone signal received from a first cell of the set of cells;

if the largest mean value is within a predetermined range of mean values, determining a second largest mean value of the measured mean values, the second largest mean value being measured from a radiotelephone signal received from a second cell of the set of cells;

if the second largest mean value is within a first sub-range of the predetermined range of mean values, assigning the first and second cells to the radiotelephone;

if the second largest mean value is within a second sub-range of the predetermined range of mean values, determining a third largest mean value of the measured mean values, the third largest mean value being measured from a radiotelephone signal received from a third cell of the set of cells; and

if the third largest mean value is within the second sub-range, assigning the first, second, and third cells to the radiotelephone.

16. The method of claim 15 wherein the predetermined range of mean values has a maximum range threshold and a minimum range threshold, the minimum range threshold being the radiotelephone'"'"'s minimum sensitivity.

17. The method of claim 16 wherein the first sub-range has a first maximum sub-range threshold substantially equal to the maximum range threshold and a first minimum sub-range threshold substantially equal to a mean value that is greater than the minimum range threshold.

18. The method of claim 16 wherein the second sub-range has a second maximum sub-range threshold substantially equal to the first minimum sub-range threshold and a second minimum sub-range threshold substantially equal to the radiotelephone'"'"'s minimum sensitivity.

19. The method of claim 17 wherein the second largest mean value being within the first sub-range includes being less than the first maximum sub-range threshold and greater than or equal to the first minimum sub-range threshold.

20. The method of claim 18 wherein the third largest mean value being within the second sub-range includes being less than the second maximum sub-range threshold and greater than or equal to the second minimum sub-range threshold.

21. The method of claim 15 and further including the step of:

if the third largest mean value is less than the second sub-range, assigning the first and second cells to the radiotelephone.

22. The method of claim 16 and further including the step of:

if the second largest mean value is less than the minimum range threshold, assigning the first cell to the radiotelephone.

23. The method of claim 16 and further including the step of:

if the largest mean value is less than the minimum range threshold, dropping a call between the radiotelephone and the cellular system.