US Patent No. 10,368,374

PRACH-BASED PROXIMITY DETECTION


Patent No. 10,368,374
Issue Date July 30, 2019
Title Prach-based Proximity Detection
Inventorship Alan Barbieri, La Jolla, CA (US)
Hao Xu, Beijing (CN)
Vikas Jain, San Diego, CA (US)
Durga Prasad Malladi, San Diego, CA (US)
Awaiz Ahmad Khan, San Diego, CA (US)
Samatha Kotla, San Diego, CA (US)
Balwinderpal Sachdev, San Diego, CA (US)
Assignee QUALCOMM Incorporated, San Diego, CA (US)

Claim of US Patent No. 10,368,374

1. A method of wireless communication, comprising:entering a reduced power mode at a dynamic power node (DPN);
monitoring, by the DPN, for physical random access channel (PRACH) transmissions from one or more user equipments (UEs) proximate to the DPN;
detecting a plurality of candidate PRACH transmissions;
combining the plurality of candidate PRACH transmissions at the DPN to determine a detected PRACH transmission from a UE;
determining, by the DPN, a proximity of the UE based on the detected PRACH transmission;
modifying operation of the DPN in response to the proximity; and
monitoring, by the DPN, for a set of root sequences associated with at least one base station in a neighbor list at the DPN, wherein the set of root sequences are located in the PRACH transmissions from the one or more UEs, wherein the determining comprises:
determining the proximity of the UE based on a receive power of the PRACH transmission associated with a detected set of root sequences associated with one of the at least one base station in the neighbor list.