(19)

(11)

EP 3 895 378 A1

(12)

(43) Date of publication: 20.10.2021 Bulletin 2021/42 (21) Application number: 19838998.3 (22) Date of filing: 12.12.2019

(51) International Patent Classification (IPC):  H04L 12/24(2006.01) H04L 12/26(2006.01) (52) Cooperative Patent Classification (CPC): H04L 43/0864; H04L 41/142; H04L 43/16; H04L 41/0896; H04L 43/0876; H04L 43/0823 (86) International application number: PCT/US2019/066072 (87) International publication number: WO 2020/123867 (18.06.2020 Gazette 2020/25)

(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: 13.12.2018 US 201816219865 29.03.2019 US 201916369597 29.03.2019 US 201916369642 (71) Applicant: Amazon Technologies Inc. Seattle, Washington 98108-1226 (US)	(72) Inventors: VILKE, Stephen Daniel Seattle, Washington 98109-5210 (US) SELVIDGE, James Morgan Seattle, Washington 98109-5210 (US) WILLIS, Rudy Seattle, Washington 98109-5210 (US) HINKS, Paul Seattle, Washington 98109-5210 (US) (74) Representative: Broderick, Terence  Urquhart-Dykes & Lord LLP 7th Floor, Churchill House Churchill Way Cardiff CF10 2HH Cardiff CF10 2HH (GB)