US 11,758,570 B2
Automated interference mitigation in frequency division duplex (FDD) wireless networks
Eric Walter Hakanson, Gilroy, CA (US); and Jeffrey Abramson Heath, Jericho, NY (US)
Assigned to Viavi Solutions, Inc., Chandler, AZ (US)
Filed by Viavi Solutions, Inc., San Jose, CA (US)
Filed on Apr. 11, 2019, as Appl. No. 16/382,020.
Claims priority of provisional application 62/656,615, filed on Apr. 12, 2018.
Prior Publication US 2019/0320444 A1, Oct. 17, 2019
Int. Cl. H04W 72/541 (2023.01); H04W 72/0446 (2023.01); H04W 72/12 (2023.01); H04L 5/14 (2006.01)
CPC H04W 72/541 (2023.01) [H04L 5/14 (2013.01); H04W 72/0446 (2013.01); H04W 72/12 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method for use in a frequency division duplex (FDD) wireless network including a base station (BS) and a user equipment (UE) being in communication through a medium having an uplink communication channel supporting uplink data communications from the UE to the BS, and a downlink communication channel supporting downlink data communications from the BS to the UE, the method comprising:
identifying an uplink frequency spectrum in the uplink communication channel being affected by an interfering signal;
determining an uplink power level of the interfering signal in the uplink communication channel;
determining whether the interfering signal is caused by a passive intermodulation distortion (PIM);
in response to determining that that the interfering signal is caused by the PIM, adjusting, based on the identified uplink frequency spectrum and the determined uplink power level of the interfering signal, at least one of a downlink power level of downlink signals being transmitted in the downlink communication channel and a downlink frequency range of the downlink signals transmitted in the downlink communication channel;
determining whether the interfering signal is external to the FDD wireless network;
in response to determining that the interfering signal is external to the FDD wireless network, determining whether a frequency spectrum of the interfering signal changes as a function of time;
in response to determining that the frequency spectrum of the interfering signal changes as a function of time, identifying a rate of change with respect to time of the frequency spectrum of the interfering signal; and
selectively scheduling uplink transmissions to avoid the interfering signal based on the rate of change with respect to time of the frequency spectrum of the interfering signal.