(19)

(11)

EP 3 970 343 A1

(12)

(43) Date of publication: 23.03.2022 Bulletin 2022/12 (21) Application number: 19928892.9 (22) Date of filing: 15.05.2019

(51) International Patent Classification (IPC):  H04L 29/08(2006.01) (52) Cooperative Patent Classification (CPC): H04L 9/3239; H04L 67/1023; H04L 2209/38; H04L 63/126; H04L 63/20 (86) International application number: PCT/CN2019/087085 (87) International publication number: WO 2020/227984 (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: Nokia Technologies Oy 02610 Espoo (FI)	(72) Inventors: FENG, Jingyu Shaanxi 710121 (CN) LV, Shaoqing Shaanxi 710121 (CN) LU, Guangyue Shaanxi 710121 (CN) (74) Representative: Nokia EPO representatives  Nokia Technologies Oy Karakaari 7 02610 Espoo 02610 Espoo (FI)