(19)

(11)

EP 3 942 552 A1

(12)

(43) Date of publication: 26.01.2022 Bulletin 2022/04 (21) Application number: 19718999.6 (22) Date of filing: 05.04.2019

(51) International Patent Classification (IPC):  G11B 27/10(2006.01) G11B 27/28(2006.01) G11B 27/031(2006.01) (52) Cooperative Patent Classification (CPC): G11B 27/28; G11B 27/031 (86) International application number: PCT/US2019/026122 (87) International publication number: WO 2020/204948 (08.10.2020 Gazette 2020/41)

(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 CO., LTD. Shenzhen, Guangdong 518129 (CN)	(72) Inventors: KU, Yueh Ning Plano, Texas 75024 (US) MA, Yuan Plano, Texas 75024 (US) WU, Yitian Plano, Texas 75024 (US) YANG, Lei Plano, Texas 75024 (US) (74) Representative: Gill Jennings & Every LLP  The Broadgate Tower 20 Primrose Street London EC2A 2ES London EC2A 2ES (GB)