System and method for detecting and measuring uplink traffic in signal repeating systems

• US 8,346,160 B2
• Filed: 05/12/2010
• Issued: 01/01/2013
• Est. Priority Date: 05/12/2010
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: Andrew LLC (CommScope Holding Company, Inc.)
• Inventors: Kummetz, Thomas
• Primary Examiner(s): GESESSE, TILAHUN
• Application Number:
  US12/778,312
• Publication Number:
  US 20110281579A1
• Time in Patent Office: 965 Days
• Field of Search: 455/11.1, 455/9, 455/7, 455/16
• US Class Current: 455/11.1
• CPC Class Codes: H04B 17/40 of relay systems
• CPC Class Codes: H04B 7/15535 Control of relay amplifier gain amplifier gain control in general H03G3/00; gain control reducing self - or loop interference H04B7/15578
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic

Abstract

A signal repeating system for a wireless network includes an antenna configured for transceiving signals between a base station and a user equipment device. Repeating circuitry is coupled to the antenna and defines an uplink path for signals from the user equipment device to the base station and a downlink path for signals from the base station to the user equipment device. The repeating circuitry includes gain circuitry and gain control circuitry that is coupled to the gain circuitry. The gain control circuitry is operable for varying the gain of the repeating circuitry according to a waveform. Measurement circuitry measures the receive power in the uplink path over time from the user equipment device. Processing circuitry cross-correlates the inverted gain variation waveform with the measured receive power for determining the existence of traffic from user equipment devices in the uplink path.

Claims

1. A signal repeating system for a wireless network comprising:

at least one first antenna configured for transceiving signals with at least one user equipment device;

repeating circuitry coupled to the at least one first antenna and defining an uplink path for signals from the user equipment device back to a base station and a downlink path for signals from the base station to the user equipment device, the repeating circuitry including gain circuitry;

gain control circuitry coupled to the gain circuitry and operable for varying the gain of the repeating circuitry according to a waveform;

measurement circuitry for measuring the receive power in the uplink path over time from the at least one user equipment device;

processing circuitry for cross-correlating the inverted gain variation waveform with the measured receive power for determining the existence of traffic from user equipment devices in the uplink path.

2. The signal repeating system of claim 1 wherein the gain control circuitry is operable for decreasing the gain of the repeating circuitry according to a waveform.

3. The signal repeating system of claim 1 wherein the processing circuitry evaluates at least one peak resulting from the cross-correlating.

4. The signal repeating system of claim 1 further comprising a device operable for measuring a transmit power required from the at least one user equipment device by the base station for transceiving signals with the base station, the processing circuitry evaluating the transmit power measurement along with results of the cross-correlation for determining the existence of traffic from user equipment devices in the uplink path.

5. The signal repeating system of claim 1 wherein the gain variation waveform is synchronized with a parameter of the wireless network.

6. The signal repeating system of claim 1 wherein the gain variation waveform is aligned in at least one of phase or frequency with a standard of the wireless network.

7. The signal repeating system of claim 1 wherein processing circuitry provides cross correlation curves associated with cross-correlating the gain variation waveform with the measured receive power, the processing circuitry operable for averaging multiple curves.

8. The signal repeating system of claim 1 wherein the gain circuitry has multiple stages, the gain control circuitry coupled to the gain circuitry at a stage in the uplink path spaced from the antenna.

9. The signal repeating system of claim 1 wherein the gain control circuitry is further operable for varying an average gain of the gain circuitry in addition to varying the gain of the repeating circuitry according to a waveform.

10. The signal repeating system of claim 1 further comprising at least one second antenna coupled with the repeating circuitry and operable for wirelessly communicating with a base station.

11. The signal repeating system of claim 1 further comprising a wire media link coupled with the repeating circuitry and operable for communicating with a base station.

12. The signal repeating system of claim 11 further comprising a master unit configured for communicating with the base station, the wire media link coupling the repeating circuitry with the master unit.

13. A signal repeater for a wireless network comprising:

at least one coverage antenna configured for transceiving signals with at least one user equipment device;

at least one donor antenna coupled with the repeating circuitry and operable for wirelessly communicating with a base station;

repeating circuitry coupled between the at least one coverage antenna and at least one donor antenna and defining an uplink path for signals from the user equipment device to a base station and a downlink path for signals from the base station to the user equipment device, the repeating circuitry including gain circuitry;

gain control circuitry coupled to the gain circuitry and operable for varying the gain of the repeating circuitry according to a waveform;

measurement circuitry for measuring the receive power in the uplink path over time from the at least one user equipment device;

processing circuitry for cross-correlating the inverted gain variation waveform with the measured receive power for determining the existence of traffic from user equipment devices in the uplink path.

14. A distributed antenna system for a wireless network comprising:

a master unit configured for communicating with a base station;

a remote unit;

wire media link coupling the remote unit and master unit;

the remote unit including;

at least one antenna configured for transceiving signals with at least one user equipment device;

repeating circuitry coupled between the at least one antenna and defining an uplink path for signals from the user equipment device to a base station and a downlink path for signals from the base station to the user equipment device, the repeating circuitry including gain circuitry;

gain control circuitry coupled to the gain circuitry and operable for varying the gain of the repeating circuitry according to a waveform;

measurement circuitry for measuring the receive power in the uplink path over time from the at least one user equipment device;

processing circuitry for cross-correlating the inverted gain variation waveform with the measured receive power for determining the existence of traffic from user equipment devices in the uplink path.

15. A method for determining the existence of traffic in a signal repeating system for a wireless network, the comprising:

transceiving signals between a base station and at least one user equipment device through a signal repeating system having an uplink path for signals from the user equipment device to the base station and a downlink path for signals from the base station to the user equipment device;

providing gain in the signal uplink and downlink paths;

varying the gain in the uplink path according to a waveform;

measuring the receive power in the uplink path over time from the at least one user equipment device;

cross-correlating the inverted gain variation waveform with the measured receive power for determining the existence of traffic from user equipment devices in the uplink path.

16. The method of claim 15 further comprising decreasing the gain in the uplink path according to a waveform.

17. The method of claim 15 further comprising evaluating at least one peak resulting from the cross-correlating for determining the existence of traffic from user equipment devices in the uplink path.

18. The method of claim 15 further comprising measuring a transmit power required from the at least one user equipment device by the base station for transceiving signals with the base station and evaluating the transmit power measurement along with results of the cross-correlation for determining the existence of traffic from user equipment devices in the uplink path.

19. The method of claim 15 further comprising synchronizing the gain variation waveform with a parameter of the wireless network.

20. The method of claim 15 further comprising aligning the gain variation in at least one of phase or frequency with a standard of the wireless network.

21. The method of claim 15 further comprising cross-correlating the gain variation waveform with the measured receive power to provide multiple curves and averaging the multiple curves.

22. The method of claim 15 further comprising providing gain in the signal uplink path in multiple stages and varying the gain in the uplink path at a stage spaced from an input to the uplink path.

23. The method of claim 15 further comprising varying an average gain of the gain circuitry in addition to varying the gain of the repeating circuitry according to a waveform.