Method and apparatus for controlling a wireless communication system

• US 6,308,072 B1
• Filed: 04/26/1996
• Issued: 10/23/2001
• Est. Priority Date: 04/26/1996
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hamied, Khalid Abdul-Aziz, Labedz, Gerald Paul
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US08/639,136
• Time in Patent Office: 2,006 Days
• Field of Search: 455/33.1-33.4, 455/34.1, 455/62, 455/63, 455/67.1, 455/422, 455/446, 455/448, 379/59, 379/60
• US Class Current: 455/448
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 16/18 Network planning tools
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection

Abstract

A simulator/controller (113) performs real-time simulation for system control in a code-division multiple access (CDMA) wireless communication system (100). The simulator/controller (113) simulates the effects of interfering AMPS wireless communication systems which coexist with CDMA wireless communication systems and also aids in the placement of new CDMA base-stations in the presence of existing AMPS base-stations. When system parameters are input to the simulator/controller (113), real-time simulation of the CDMA wireless communication system (100) predicts potential problem areas of the CDMA wireless communication system (100) and controls the CDMA wireless communication system (100) to avoid the problems before they occur.

Claims

1. A method of controlling a code-division multiple access (CDMA) wireless communication system, the CDMA wireless communication system including a mobile station responsive to a plurality of base-stations, the method comprising the steps of:

simulating parameters related to the CDMA wireless communication system in a simulator;

generating location information related to an analog wireless communication system which is a potential source of interference to the CDMA wireless communication system based on the simulation; and

controlling certain aspects of the CDMA wireless communication system utilizing the data generated.

2. The method of claim 1, wherein the parameters related to the CDMA wireless communication system include parameters related to forward link coverage, forward link power level, frame erasure rate (FER), reverse link coverage, reverse link power level, reverse link FER and the quality of a forward link control signal.

3. The method of claim 1, wherein the step of controlling further comprises comparing, in a base-station, information related to the location of the mobile station with the location information related to an analog wireless communication system which is a potential source of interference.

4. The method of claim 3, wherein the information related to the location of the mobile station is either transmitted to the base-station from the mobile station, determined solely by the base-station, or a combination of the two.

5. A method of placing a new base-station in a wireless communication system, the method comprising the steps of:

measuring a first radius and a second radius from an existing base-stations of the wireless communication system;

determining where interfering base-stations are located with respect to the measured first radius and the measured second radius; and

placing the new base-station based on the step of determining.

6. The method of claim 5, wherein the step of placing the new base-station further comprises placing the new base-station such that a circle having the first radius and centered at the new base-station encompasses an interfering base-station.

7. The method of claim 5, wherein the step of placing the new base-station further comprises placing the new base-station such that a circle having the second radius and centered at the new base-station encompasses an interfering base-station.

8. A method of mitigating interference in a wireless communication system, the wireless communication system including a mobile station responsive to any one of a plurality of base-stations, the method comprising the steps of:

determining that the mobile station will incur interference; and

controlling the mobile station such that the mobile station avoids the interference before the interference occurs.

9. The method of claim 8, wherein the step of determining further comprises simulating where, based on geographic location, the mobile station will incur interference.

10. The method of claim 9, wherein the step of simulating further comprises simulating where, based on geographic location, a CDMA mobile station will incur interference from an analog wireless communication system.

11. The method of claim 10, wherein the step of controlling further comprises transmitting a message to a CDMA mobile station to enable a receiver front-end attenuator in the CDMA mobile station before the interference from the analog wireless communication system occurs.

12. The method of claim 10, wherein the step of controlling further comprises transmitting a message to a CDMA mobile station to force the CDMA mobile station into soft handoff before the interference from the analog wireless communication system occurs.

13. The method of claim 10, wherein the step of controlling further comprises the step of adjusting parameters related to the forward link of the CDMA wireless communication system.

14. The method of claim 10, wherein the step of controlling further comprises the step of adjusting parameters related to the forward link of the CDMA wireless communication system.

15. A method of performing soft handoff in a spread spectrum wireless communication system, the spread spectrum wireless communication system including a mobile station responsive to any one of a plurality of base-stations compatible with the spread spectrum wireless communication system, the method comprising the steps of:

simulating characteristics of a plurality of received signals which would be transmitted by a corresponding plurality of base-stations which would be candidates for soft handoff;

analyzing the simulated characteristics of the plurality of received signals; and

instructing a base-station of the plurality of base-stations to enter into soft handoff with the mobile station based on the analysis.

16. The method of claim 15, wherein the plurality of signals are a plurality of received pilot signals.

17. An apparatus for controlling a code-division multiple access (CDMA) wireless communication system, the CDMA wireless communication system including a mobile station responsive to a plurality of base-stations, the apparatus comprising:

means for simulating parameters related to the CDMA wireless communication system in a simulator;

means for generating location information related to an analog wireless communication system which is a potential source of interference to the CDMA wireless communication system based on the simulation; and

means for controlling certain aspects of the CDMA wireless communication system utilizing the data generated.

18. The apparatus of claim 17, wherein the parameters related to the CDMA wireless communication system include parameters related to forward link coverage, forward link power level, frame erasure rate (FER), reverse link coverage, reverse link power level, reverse link FER and the quality of a forward link control signal.

19. The apparatus of claim 17, wherein the means for controlling further comprises means, in a base-station, for comparing information related to the location of the mobile station with the location information related to an analog wireless communication system which is a potential source of interference.

20. The apparatus of claim 19, wherein the information related to the location of the mobile station is either transmitted to the base-station from the mobile station, determined solely by the base-station, or a combination of the two.

21. An apparatus for mitigating interference in a wireless communication system, the wireless communication system including a mobile station responsive to any one of a plurality of base-stations, the apparatus comprising:

means for determining that the mobile station will incur interference; and

means for controlling the mobile station such that the mobile station avoids the interference before the interference occurs.

22. The apparatus of claim 21, wherein the means for determining further comprises means for simulating where, based on geographic location, the mobile station will incur interference.

23. The apparatus of claim 22, wherein the means for simulating further comprises means for simulating where, based on geographic location, a CDMA mobile station will incur interference from an analog wireless communication system.

24. The apparatus of claim 23, wherein the means for controlling further comprises means for transmitting a message to a CDMA mobile station to enable a receiver front-end attenuator in the CDMA mobile station before the interference from the analog wireless communication system occurs.

25. The apparatus of claim 23, wherein the means for controlling further comprises means for transmitting a message to a CDMA mobile station to force the CDMA mobile station into soft handoff before the interference from the analog wireless communication system occurs.

26. The apparatus of claim 23, wherein the means for controlling further comprises means for adjusting parameters related to the forward link of the CDMA wireless communication system.