Time division duplex (TDD) network protection repeater
A technology is described for a time division duplex (TDD) repeater with network protection. The TDD repeater can comprise a first port, a second port, and one or more amplification paths coupled between the first port and the second port. The TDD repeater can comprise a signal detector configured to measure a received signal power for a downlink (DL) signal in a first set of one or more TDD DL subframes. The TDD repeater can be further configured to adjust an uplink (UL) noise power or gain of the one or more amplification paths based on the received signal power for the DL signal in the first set of the one or more TDD DL subframes.
1. A method for reducing oscillation in a time division duplex (TDD) repeater, the method comprising:
receiving a first direction TDD signal at a first port of the TDD repeater;
applying a first amplification factor to the first direction TDD signal;
transmitting a resultant amplified first direction TDD signal via a second port of the TDD repeater;
measuring a first signal level of the first direction TDD signal within a time period of a first selected subframe of the first direction TDD signal while the first amplification factor is being applied to the first direction TDD signal;
applying a second amplification factor to the first direction TDD signal, the second amplification factor being less than the first amplification factor;
measuring a second signal level of the first direction TDD signal within a time period of a second selected subframe of the first direction TDD signal while the second amplification factor is being applied to the first direction TDD signal; and
reducing the first amplification factor by a predetermined amount in the event that the second signal level is less than the first signal level by a threshold amount greater than a difference between the first amplification factor and the second amplification factor.
2. The method of claim 1 , wherein the first selected subframe and the second selected subframe are a same first direction subframe of the first direction TDD signal.
3. The method of claim 1 , wherein the first selected subframe and the second selected subframe are a different first direction subframe of the first direction TDD signal.
4. The method of claim 1 , wherein the second amplification factor is approximately zero.
5. The method of claim 1 , further comprising:
determining a TDD uplink (UL)/downlink (DL) frame configuration for one or more frames of the first direction TDD signal;
identifying a maximum number of adjacent subframes in the one or more frames in the first direction signal based on the TDD UL/DL frame configuration; and
measuring the first signal level and the second signal level during the maximum number of adjacent subframes for the one or more frames.
6. The method of claim 5 , further comprising measuring the first signal level and the second signal level during the maximum number of adjacent subframes for multiple non-adjacent frames in the one or more frames.
7. The method of claim 1 , wherein the first direction signal is an uplink signal.