Testing a mobile communications system

• US 6,272,337 B1
• Filed: 05/17/1999
• Issued: 08/07/2001
• Est. Priority Date: 05/17/1999
• Status: Active Grant

• Current Assignee: RPX Clearinghouse LLC (RPX Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Cassanova, Jeffrey P., Smith, Kristen J., Cavasso, Blaine D., Mount, H. Brent
• Primary Examiner(s): MAUNG, NAY AUNG
• Application Number:
  US09/312,950
• Time in Patent Office: 813 Days
• Field of Search: 455/67.1, 455/67.4, 455/423, 455/424, 455/425, 455/446, 455/226.1, 455/226.2, 455/456, 455/457, 379/1, 379/10, 379/29
• US Class Current: 455/423
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

A method and apparatus testing a mobile communications system includes a test control system, real mobile units, and an attenuator matrix controllable by the test control system to vary strengths of signals transmitted by the mobile units for receipt by the mobile communications system. By varying the attenuation of the signals communicated between the mobile units and the mobile communications system, the mobile units may be made to appear to be moving to the mobile communications system. Movement patterns of the mobile units may be stored in the test control system to control attenuation in the attenuator matrix.

Claims

1. A simulation system for testing a mobile communications system, comprising:

a controller;

a plurality of mobile units; and

a signal processing device controllable by the controller to vary strengths of signals transmitted by the mobile units for receipt by the mobile communications system to simulate movement of the mobile units.

2. The simulation system of claim 1, wherein the controller is adapted to cause the mobile units to request access to the mobile communications system.

3. The simulation system of claim 1, wherein the signal processing device includes an array of attenuators.

4. The simulation system of claim 3, further comprising wired links coupling the array of attenuators to the mobile units.

5. The simulation system of claim 4, wherein the links include coaxial cables.

6. The simulation system of claim 4, further comprising antennas coupled to the array of attenuators, the antennas adapted to communicate with the mobile communications system.

7. The simulation system of claim 1, wherein each of the mobile units includes an input/output port coupled to the controller.

8. The simulation system of claim 7, wherein the controller is adapted to issue commands to the mobile units through respective input/output ports.

9. The simulation system of claim 8, wherein the commands include a command to request access to the mobile communications system.

10. A test system for testing a mobile communications system, comprising:

a mobile unit having a wireless port;

a signal processing device having a first port; and

a cable connecting the mobile unit wireless port to the first port of the signal processing device,

the signal processing device further including circuitry to control the strength of a signal from the mobile unit wireless port and further including a second port to communicate with the mobile communications system.

11. A system for testing a mobile communications system using real mobile units, comprising:

a controller; and

a storage device containing movement patterns of the mobile units,

the controller adapted to convert the movement patterns into control signals provided to control attenuation of signals transmitted by the mobile units for receipt by the mobile communications system.

12. The system of claim 11, wherein the controller includes one or more tasks adapted to transmit a command to request access to the mobile communications system to the mobile units.

13. The system of claim 11, wherein the controller includes a component adapted to transmit voice data to, and receive voice data from, the mobile units.

14. A method of testing a mobile communications system, comprising:

requesting access to the mobile communications system with one or more mobile units; and

varying strengths of signals transmitted by the mobile units, using a signal processing device, to simulate movement of the mobile units.

15. The method of claim 14, further comprising providing movement patterns of the one or more mobile units.

16. The method of claim 15, further comprising converting the movement patterns into control signals sent to the signal processing device.

17. The method of claim 16, wherein the converting includes converting the movement patterns into control signals sent to an array of attenuators.

18. The method of claim 14, further comprising providing a command to request access to the mobile communications system to the one or more mobile units over a link.

19. An apparatus for testing a wireless communications system, comprising:

a plurality of units capable of transmitting communications signals for receipt by the wireless communications system; and

a signal processing element responsive to control signals to vary strengths of the communications signals from the units before transmission of the communications signals to the wireless communications system.

20. The apparatus of claim 19, further comprising one or more antennas, wherein the signal processing element includes a first set of ports coupled to the units and a second set of ports coupled to the one or more antennas for communicating with the wireless communications system.

21. The apparatus of claim 20, wherein the signal processing element includes an array of attenuators.

22. The apparatus of claim 21, wherein one attenuator is provided between each of the first ports and each of the second ports.

23. The apparatus of claim 19, wherein the signal processing element includes an array of attenuators.

24. An article including one or more storage media containing instructions for testing a wireless communications system, the instructions when executed causing a test system to:

receive representations of movement patterns of real mobile units in a test operation; and

translate the representations of movement patterns to control signals provided to a signal processing device to vary strengths of signals transmitted by the mobile units for receipt by the wireless communications system.

25. The article of claim 24, wherein the one or more storage media contain instructions that when executed further cause the test system to send a command to one of the mobile units to request an access to the wireless communications system.

26. The article of claim 25, wherein the one or more storage media contain instructions that when executed further cause the test system to send a command to one of the mobile units to dial a predetermined number.

27. The article of claim 25, wherein the one or more storage media contain instructions that when executed further cause the test system to send a command to one of the mobile units to terminate a call with the wireless communications system.