US 12,446,070 B2
Systems and methods for UE operation in presence of CCA
Iana Siomina, Täby (SE); Muhammad Ali Kazmi, Sundbyberg (SE); and Santhan Thangarasa, Vällingby (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/634,468
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Aug. 14, 2020, PCT No. PCT/EP2020/072902
§ 371(c)(1), (2) Date Feb. 10, 2022,
PCT Pub. No. WO2021/032641, PCT Pub. Date Feb. 25, 2021.
Claims priority of provisional application 62/887,935, filed on Aug. 16, 2019.
Prior Publication US 2022/0330339 A1, Oct. 13, 2022
Int. Cl. H04W 36/00 (2009.01); H04W 36/08 (2009.01); H04W 36/24 (2009.01); H04W 74/08 (2009.01); H04W 74/0816 (2024.01); H04W 76/20 (2018.01); H04W 36/14 (2009.01)
CPC H04W 74/0816 (2013.01) [H04W 36/08 (2013.01); H04W 36/249 (2023.05); H04W 74/0866 (2013.01); H04W 76/20 (2018.02); H04W 36/1446 (2023.05)] 27 Claims
OG exemplary drawing
 
1. A method performed by a wireless device for cell selection or cell re-selection accounting for Clear Channel Assessment, CCA, requirements, the method comprising:
determining a measurement period in a serving cell for the cell selection or cell re-selection (T1), wherein the measurement period is determined based on a number of consecutive Discontinuous Reception, DRX, cycles;
determining the cell selection time (T1) is used if CCA is in use, the cell selection time (T1) being extended relative to a duration used where CCA is not in use, determining the cell selection time (T1) being based on one or more of: CCA parameters; Channel Occupancy Time, COT, parameters; and Discovery Reference Signal, DRS, properties;
determining a number of measurement occasions configured with a DRS in the serving cell during T1;
determining availability of the DRS at the measurement occasions;
performing measurement based on availability of the DRS at the measurement occasions during T1, the measurement during the cell selection time (T1) taking into account one or more of:
a time required to evaluate whether a newly detectable cell meets selection criteria being a function of, or proportional to, a number of DRS occasions necessary to detect the presence of DRS and a number of configured DRS occasions in the target cell not available;
a time required to evaluate that a cell that has already been detected but not selected has met the selection criteria being a function of, or proportional to, a number of DRS occasions necessary to detect the presence of DRS, a number of samples necessary to perform a measurement and evaluate based on the detected DRS and a number of configured DRS occasions in the target cell not available; and
a measurement periodicity of already identified cells; and
determining whether to perform the cell selection or the cell re-selection based on the measurement during cell selection time (T1).