US 12,075,466 B2
Indication of downlink clear channel assessment failures
Johan Rune, Lidingö (SE); Min Wang, Luleå (SE); and Iana Siomina, Täby (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/598,425
Filed by Telefonaktiebolaget LM Ericsson (PUBL), Stockholm (SE)
PCT Filed Mar. 27, 2020, PCT No. PCT/IB2020/052934
§ 371(c)(1), (2) Date Sep. 27, 2021,
PCT Pub. No. WO2020/194261, PCT Pub. Date Oct. 1, 2020.
Claims priority of provisional application 62/825,070, filed on Mar. 28, 2019.
Prior Publication US 2022/0183055 A1, Jun. 9, 2022
Int. Cl. H04W 74/00 (2009.01); H04W 74/0816 (2024.01); H04W 76/10 (2018.01); H04W 80/02 (2009.01)
CPC H04W 74/008 (2013.01) [H04W 74/006 (2013.01); H04W 74/0816 (2013.01); H04W 76/10 (2018.02); H04W 80/02 (2013.01)] 26 Claims
OG exemplary drawing
 
1. A method performed by a wireless device for detecting a downlink radio failure, the method comprising:
establishing a wireless connection with a network node using unlicensed radio spectrum;
receiving an indication that the network node incurred a clear channel assessment (CCA) failure in a prior attempt to communicate with the wireless device, wherein the indication of the CCA failure comprises a ratio of CCA failures to successful transmissions by the network node to the wireless device; and
in response to the indication of the CCA failure, determining whether to trigger a radio failure condition.