US 12,317,147 B2
Handling of buffered traffic during inter-CU migration of an integrated access backhaul (IAB) node
Oumer Teyeb, Montréal (CA); Filip Barac, Huddinge (SE); and Marco Belleschi, Solna (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 18/011,761
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Jul. 22, 2021, PCT No. PCT/SE2021/050747
§ 371(c)(1), (2) Date Dec. 20, 2022,
PCT Pub. No. WO2022/019825, PCT Pub. Date Jan. 27, 2022.
Claims priority of provisional application 63/055,977, filed on Jul. 24, 2020.
Prior Publication US 2023/0232294 A1, Jul. 20, 2023
Int. Cl. H04W 36/08 (2009.01); H04W 36/02 (2009.01)
CPC H04W 36/08 (2013.01) [H04W 36/0235 (2023.05)] 20 Claims
OG exemplary drawing
 
1. A method for an integrated access backhaul (IAB) node in a wireless network to migrate from a first centralized unit (CU) to a second CU, the method comprising:
receiving instructions for modified handling of uplink (UL) and/or downlink (DL) data buffered at the IAB node, wherein the instructions for modified handling of buffered UL data and/or buffered DL data include one or more of the following:
one or more first criteria related to amounts of DL data buffered at the IAB node;
one or more second criteria related to whether DL data buffered at the IAB node should be deleted or forwarded to respective descendant nodes;
one or more third criteria related to amounts of UL data buffered at the IAB node; and
one or more fourth criteria related to whether buffer status reports (BSRs) should be transmitted, to a parent node, for UL data buffered at the IAB node;
receiving a handover (HO) command from the first CU via a source parent IAB node, wherein the HO command includes an identifier of a target cell for the handover;
determining that the HO command is for an inter-CU migration of the IAB node to the second CU; and
based on determining that the HO command is for an inter-CU migration, performing modified handling of the UL and/or DL data buffered at the IAB node until execution of the HO command, in accordance with the instructions.