(19)

(11)

EP 3 970 312 A1

(12)

(43) Date of publication: 23.03.2022 Bulletin 2022/12 (21) Application number: 19725338.8 (22) Date of filing: 16.05.2019

(51) International Patent Classification (IPC):  H04L 9/08(2006.01) (52) Cooperative Patent Classification (CPC): H04L 9/0858 (86) International application number: PCT/EP2019/062672 (87) International publication number: WO 2020/228961 (19.11.2020 Gazette 2020/47)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: Huawei Technologies Duesseldorf GmbH 40549 Düsseldorf (DE)	(72) Inventor: FUNG, Fred, Chi, Hang 80992 Munich (DE) (74) Representative: Roth, Sebastian  Mitscherlich PartmbB Patent- und Rechtsanwälte Sonnenstraße 33 80331 München 80331 München (DE)