	US 12,075,505 B2
	Efficient backhaul-link failure recovery in integrated access backhaul (IAB) networks
Ajmal Muhammad, Sollentuna (SE); Oumer Teyeb, Montreal (CA); and Gunnar Mildh, Sollentuna (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/430,524
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Feb. 12, 2020, PCT No. PCT/EP2020/053638 § 371(c)(1), (2) Date Aug. 12, 2021, PCT Pub. No. WO2020/165275, PCT Pub. Date Aug. 20, 2020.
Claims priority of provisional application 62/805,013, filed on Feb. 13, 2019.
Prior Publication US 2022/0141910 A1, May 5, 2022
Int. Cl. H04W 76/19 (2018.01); H04L 45/28 (2022.01); H04W 40/24 (2009.01); H04W 40/34 (2009.01); H04W 48/16 (2009.01); H04W 48/20 (2009.01); H04W 88/14 (2009.01)

CPC H04W 76/19 (2018.02) [H04L 45/28 (2013.01); H04W 40/24 (2013.01); H04W 40/34 (2013.01); H04W 48/16 (2013.01); H04W 48/20 (2013.01); H04W 88/14 (2013.01)]

18 Claims

9. A method implemented in a network node having a first parent network node, the method comprising:

detecting a failure of a backhaul link in an integrated access backhaul, IAB, network between the network node and the first parent network node of the network node;

attempting to find an alternative backhaul link to replace the failed backhaul link;

if the attempt to find the alternative backhaul link fails, then:

cause a first child network node one level below the first parent network node to attempt to find a second network node to serve as a new parent network node for the alternative backhaul link;

if the first child network node one level below the first parent network node fails to find another network node to serve as the new parent network node, cause a third child network node one level below the first child network node to attempt to find another network node to serve as the new parent network node; and

if the attempt to find an alternative backhaul link succeeds, then utilizing the alternative backhaul link.