Systems and methods for adaptive repeaters

• US 9,768,854 B2
• Filed: 01/09/2017
• Issued: 09/19/2017
• Est. Priority Date: 08/21/2013
• Status: Active Grant

• Current Assignee: Aviat U.S., Inc. (Aviat Networks Incorporated)
• Original Assignee: Aviat U.S., Inc. (Aviat Networks Incorporated)
• Inventors: Licardie, Sergio, Arya, Rishipal, Chen, Chun-Hao
• Primary Examiner(s): HUYNH, KHOA B
• Application Number:
  US15/402,137
• Publication Number:
  US 20170117952A1
• Time in Patent Office: 253 Days
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 7/14 Relay systems
• CPC Class Codes: H04B 7/15 Active relay systems
• 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 7/1555 Selecting relay station antenna mode, e.g. selecting omnidirectional -, directional beams, selecting polarizations
• CPC Class Codes: H04B 7/15557 Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

In some embodiments, a first RF signal is received at a wireless repeater, a signal quality is determined based on the first RF signal, the signal quality is analyzed based on a parameter, an operation mode is auto selected based on analysis of the signal quality, and a second RF signal based on the first RF signal is generated for transmission according to the selected operation mode. Under one mode, a first RAC of the wireless may generate data based on a first IF signal downconverted from a first RF signal. Based on the data, a second RAC of the wireless repeater may generate a second IF signal, which can be used to generate a second RF signal for transmission. Under another mode, the first RAC may provide the IF signal to the second RAC, which provides the IF signal for generation of the second RF signal.

Claims

1. A method comprising:

receiving a first radio frequency (RF) signal portion of an RF signal at a wireless repeater at a first time, the RF signal being communicated from a transmitter and directed over a communications path to a receiver, the wireless repeater operating in a repeater mode at the first time, the wireless repeater being in the communications path between a first portion of the communications path and a second portion of the communications path;

downconverting the first RF signal portion to a first lower frequency (LF), thereby generating a first LF signal portion;

determining a first signal quality value of the first LF signal portion;

evaluating whether the first signal quality value satisfies a first signal quality condition indicating that a signal quality of the RF signal has sufficiently degraded over the first portion of the communications path;

when the first signal quality value satisfies the first signal quality condition, switching the wireless repeater to a regenerator mode, receiving a future RF signal portion, downconverting the future RF signal portion to a future LF signal portion, demodulating the future LF signal portion to data, and remodulating the data to a second LF signal portion;

when the first signal quality value does not satisfy the first signal quality condition, maintaining the wireless repeater in the repeater mode, and passing the future LF signal portion as the second LF signal portion;

upconverting the second LF signal portion to a second RF signal portion; and

transmitting the second RF signal portion to the second portion of the communications path.

2. The method of claim 1, wherein the RF frequency is a microwave frequency.

3. The method of claim 1, wherein the LF frequency is an intermediate frequency.

4. The method of claim 1, wherein the signal quality is one of radio signal level (RSL), a signal-to-noise ratio (SNR), or a bit error rate (BER).

5. The method of claim 1, wherein the evaluating whether the first signal quality value satisfies the first signal quality condition comprises comparing the first signal quality value with a first threshold value.

6. The method of claim 5, wherein the evaluating whether the first signal quality value satisfies the first signal quality condition comprises determining if a signal quality indicator (SQI) violates a transmitter (TX) spectrum mask out.

7. The method of claim 1, further comprising:

when the wireless repeater is in the regenerator mode,

determining a future signal quality value of the future LF signal portion at a second time, the second time being subsequent to the first time;

evaluating whether the future signal quality value satisfies a second signal quality condition indicating that the signal quality of the RF signal has sufficiently improved over the first portion of the communications path; and

when the future signal quality value satisfies the second signal quality condition, switching the wireless repeater to the repeater mode.

8. The method of claim 7, further comprising waiting for a timer to expire before allowing the wireless repeater to switch from the regenerator mode to the repeater mode.

9. The method of claim 1, further comprising waiting for a timer to expire before allowing the wireless repeater to switch from the repeater mode to the regenerator mode.

10. A wireless repeater comprising:

a receiving radio frequency unit configured to receive a first radio frequency (RF) signal portion of an RF signal at a first time, the RF signal being communicated from a transmitter and directed over a communications path to a receiver, the wireless repeater operating in a repeater mode at the first time, the wireless repeater being in the communications path between a first portion of the communications path and a second portion of the communications path;

a receiving radio access card configured to downconvert the first RF signal portion to a first lower frequency (LF), thereby generating a first LF signal portion;

a control module configured to determine a first signal quality value of the first LF signal portion, evaluate whether the first signal quality value satisfies a first signal quality condition indicating that a signal quality of the RF signal has sufficiently degraded over the first portion of the communications path, and switch the wireless repeater to a regenerator mode when the first signal quality value satisfies the first signal quality condition or maintain the wireless repeater in the repeater mode when the first signal quality value does not satisfy the first signal quality condition;

regenerator mode circuitry configured to demodulate a future LF signal portion to data and to remodulate the data to a second LF signal portion when the first signal quality value satisfies the first signal quality condition;

repeater mode circuitry configured to pass the future LF signal portion as the second LF signal portion when the first signal quality value does not satisfy the first signal quality condition;

a transmitting radio access card configured to upconvert the second LF signal portion to a second RF signal portion; and

a transmitting radio frequency unit configured to transmit the second RF signal portion to the second portion of the communications path.

11. The wireless repeater of claim 10, wherein the RF frequency is a microwave frequency.

12. The wireless repeater of claim 10, wherein the LF frequency is an intermediate frequency.

13. The wireless repeater of claim 10, wherein the signal quality is one of radio signal level (RSL), a signal-to-noise ratio (SNR), or a bit error rate (BER).

14. The wireless repeater of claim 10, wherein the control module is configured to evaluate whether the first signal quality value satisfies the first signal quality condition by comparing the first signal quality value with a first threshold value.

15. The wireless repeater of claim 14, wherein the control module is configured to evaluate whether the first signal quality value satisfies the first signal quality condition by determining if a signal quality indicator (SQI) violates a transmitter (TX) spectrum mask out.

16. The wireless repeater of claim 10, wherein the control module is further configured to:

when the wireless repeater is in the regenerator mode,

determine a future signal quality value of the future LF signal portion at a second time, the second time being subsequent to the first time;

evaluate whether the future signal quality value satisfies a second signal quality condition indicating that the signal quality of the RF signal has sufficiently improved over the first portion of the communications path; and

when the future signal quality value satisfies the second signal quality condition, switch the wireless repeater to the repeater mode.

17. The wireless repeater of claim 16, further comprising a guard timer configured to monitor a time period before the wireless repeater is allowed to switch from the regenerator mode to the repeater mode.

18. The wireless repeater of claim 10, further comprising a guard timer configured to monitor a time period before the wireless repeater is allowed to switch from the repeater mode to the regenerator mode.

19. A wireless repeater comprising:

means for receiving a first radio frequency (RF) signal portion of an RF signal at a first time, the RF signal being communicated from a transmitter and directed over a communications path to a receiver, the wireless repeater operating in a repeater mode at the first time, the wireless repeater being in the communications path between a first portion of the communications path and a second portion of the communications path;

means for downconverting the first RF signal portion to a first lower frequency (LF), thereby generating a first LF signal portion;

means for determining a first signal quality value of the first LF signal portion;

means for evaluating whether the first signal quality value satisfies a first signal quality condition indicating that a signal quality of the RF signal has sufficiently degraded over the first portion of the communications path;

means for switching the wireless repeater to a regenerator mode when the first signal quality value satisfies the first signal quality condition or maintaining the wireless repeater in the repeater mode when the first signal quality value does not satisfy the first signal quality condition;

regenerator circuitry for demodulating a future LF signal portion to data and remodulating the data to a second LF signal portion when the first signal quality value satisfies the first signal quality condition;

repeater mode circuitry for passing the future LF signal portion as the second LF signal portion when the first signal quality value does not satisfy the first signal quality condition;

means for upconverting the second LF signal portion to a second RF signal portion; and

means for transmitting the second RF signal portion to the second portion of the communications path.