Method and system for repeater shutdown based on received power

• US 7,764,924 B1
• Filed: 05/25/2007
• Issued: 07/27/2010
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Mitchell, Gene S., Sill, Timothy W., Smithey, Paul S.
• Primary Examiner(s): Anderson; Matthew D
• Assistant Examiner(s): Safaipour; Bobbak
• Application Number:
  US11/754,086
• Time in Patent Office: 1,159 Days
• Field of Search: 455/7, 455/13.4, 455/24, 455/11.1, 455/13.1, 455/522, 455/16, 370/318
• US Class Current: 455/7
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/40 of relay systems
• CPC Class Codes: H04B 3/36 Repeater circuits H04B3/58 takes precedence
• CPC Class Codes: H04B 7/15507 Relay station based processing for cell extension or control of coverage area, network planning with network coordinated processing with regard to cell extension H04W16/26; network topologies using dedicated repeater stations H04W84/047; terminal devices adapted for relaying to or from an other terminal H04W88/04
• 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

Abstract

Controlling a cellular radio frequency repeater amplifier and their gain factors. In preferred embodiments, the method is used in personal home repeaters that may be used by wireless services users. The repeaters are preferably configured to automatically control their setting without requiring supervision or control by the wireless service provider. The wireless provider also need not have knowledge of where the repeater devices are placed within the network. The preferred system and methods reduce potential problems that may arise when repeaters with fixed gain are placed within close proximity of a cell site. The preferred methods shut down the forward and reverse amplifiers based on the received signal level from the base station.

Claims

1. A method comprising:

at a cellular signal repeater, measuring a receive signal strength of a forward channel signal received from a base transceiver station;

setting a gain value of the repeater'"'"'s reverse channel amplifier to a first gain value when the received signal strength is below a first threshold;

setting the gain value of the repeater'"'"'s reverse channel amplifier to a gain factor of zero when the receive signal strength is above the first threshold;

setting a gain value of the repeater'"'"'s forward channel amplifier to a first gain value when the received signal strength is below a second threshold, wherein the second threshold is higher than the first threshold; and

setting the gain value of the repeater'"'"'s forward channel amplifier to a gain factor of zero when the receive signal strength is above the second threshold.

2. The method of claim 1, wherein the first threshold is −

78 dBm.

3. The method of claim 1, wherein the first threshold is −

82 dBm.

4. The method of claim 1, wherein the first threshold is selected from the range of −

82 dBm to −

75 dBm.

5. The method of claim 1, wherein the first gain value is a fixed value in the range of 50 dB to 105 dB.

6. The method of claim 1, wherein the first gain value is approximately 80 dB.

7. The method of claim 1 wherein the first threshold includes hysteresis such that the first threshold is incrementally higher when the receive signal strength is increasing.

8. The method of claim 1, wherein the second threshold is between approximately −

82 dBm and −

78 dBm.

9. The method of claim 1 wherein the first threshold includes hysteresis such that the first threshold is incrementally higher when the receive signal strength is increasing.

10. The method of claim 1 further comprising powering down the repeater when the received signal strength is above the second threshold.

11. A cellular signal repeater device comprising:

a donor antenna, the donor antenna for receiving radio frequency signals from a base transceiver station (BTS) and for transmitting radio frequency (RF) signals to the BTS;

a receive signal strength measurement device to measure signal strength received from the BTS;

a coverage antenna for receiving RF signals from a wireless subscriber device;

a reverse channel amplifier connected to the coverage antenna to receive RF signals from the coverage antenna, amplify the RF signals, and provide the amplified RF signals to the donor antenna for transmission to the BTS, the reverse channel amplifier including a gain control input;

a reverse channel gain setting module that receives an indication of signal strength measurements obtained from the receive signal strength measurement device, and connected to the reverse channel amplifier gain control input to control the reverse channel amplifier gain factor, wherein the reverse channel gain setting module sets the reverse channel amplifier gain factor to a first value when the receive signal strength is below a first threshold, and sets the reverse channel amplifier gain factor to zero when the receive signal strength is above the first threshold;

a forward channel amplifier connected to the donor antenna to receive RF signals from the donor antenna, amplify the RF signals, and provide the amplified RF signals to the coverage antenna for transmission to the wireless communication device, the forward channel amplifier including a gain control input; and

a forward channel gain setting module that receives the indication of signal strength measurements obtained from the receive signal strength measurement device, and connected to the forward channel amplifier gain control input to control the forward channel amplifier gain factor, wherein the forward channel gain setting module sets the forward channel amplifier gain factor to a first value when the receive signal strength is below a second threshold, and sets the reverse channel amplifier gain factor to zero when the receive signal strength is above the second threshold, wherein the second threshold is higher than the first threshold.

12. The cellular signal repeater device of claim 11, wherein the receive signal strength measurement device measures a signal power level in a cellular carrier frequency band.

13. The cellular signal repeater device of claim 11, wherein the first threshold is selected from the range of −

75 dBm to −

78 dBm.

14. The cellular signal repeater device of claim 11, wherein the forward channel gain setting module further includes hysteresis to prevent rapid toggling of the forward channel amplifier gain factor.

15. The cellular signal repeater device of claim 11, wherein the forward channel gain setting module provides a power down control indication when the receive signal strength is above the second threshold.

16. The cellular signal repeater device of claim 11, wherein the second threshold is selected from the range of −

75 dBm to −

82 dBm.