US 11,930,538 B2
Improving physical random-access channel (PRACH) robustness against interference
Jingya Li, Gothenburg (SE); Naga Vishnu Kanth Irukulapati, Västra Frölunda (SE); Sebastian Faxér, Stockholm (SE); Henrik Sahlin, Mölnlycke (SE); and Mårten Sundberg, Årsta (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/276,308
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Sep. 2, 2019, PCT No. PCT/SE2019/050819
§ 371(c)(1), (2) Date Mar. 15, 2021,
PCT Pub. No. WO2020/060463, PCT Pub. Date Mar. 26, 2020.
Claims priority of provisional application 62/732,607, filed on Sep. 18, 2018.
Prior Publication US 2023/0143073 A1, May 11, 2023
Int. Cl. H04W 74/08 (2009.01); H04L 5/14 (2006.01)
CPC H04W 74/0841 (2013.01) [H04L 5/1469 (2013.01); H04W 74/0866 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method, performed by a network node, for configuring a physical random-access channel (PRACH) of a cell in a time-division-duplexed (TDD) radio access network (RAN), the method comprising:
determining an increase in a level of remote interference in the cell, wherein determining the increase in the level of remote interference comprises one or more of the following:
detecting an observed increase or an observed rate of increase in interference levels during one or more uplink (UL) symbols immediately following a downlink-to-uplink switch of a cell transmission direction;
determining a distribution of propagation delays of the remote interference by estimating interference levels in a plurality of UL symbols immediately following a downlink-to-uplink switch of the cell transmission direction; and
receiving remote interference management reference signals (RIM-RS);
in response to determining the increase, selecting a first PRACH configuration from a first subset of available PRACH configurations, wherein:
the first subset of available PRACH configurations is more robust against remote interference than a second subset of the available PRACH configurations, and
the first subset is exclusive of the second subset; and
transmitting, to one or more user equipment (UEs), first information indicating that the first PRACH configuration should be used for accessing the cell via the PRACH.