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(11)

EP 4 150 865 A1

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(43) Date of publication: 22.03.2023 Bulletin 2023/12 (21) Application number: 21804968.2 (22) Date of filing: 30.04.2021

(51) International Patent Classification (IPC):  H04L 12/46(2006.01) H04L 12/701(2013.01) H04L 29/06(2006.01) (52) Cooperative Patent Classification (CPC): H04L 12/4633; H04L 12/4645; H04L 45/02; H04L 45/50; H04L 45/74 (86) International application number: PCT/CN2021/091693 (87) International publication number: WO 2021/227905 (18.11.2021 Gazette 2021/46)

(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 (30) Priority: 11.05.2020 US 202016872153 (71) Applicant: Primewan Limited Hong Kong 999077 (HK)	(72) Inventors: LI, Ming Beijing 100089 (CN) JIA, Yuan Yang Beijing 100089 (CN) (74) Representative: Dilg, Haeusler, Schindelmann Patentanwaltsgesellschaft mbH  Leonrodstraße 58 80636 München 80636 München (DE)