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(11)

EP 3 114 742 A1

(12)

(43) Date of publication: 11.01.2017 Bulletin 2017/02 (21) Application number: 14884897.1 (22) Date of filing: 07.03.2014

(51) International Patent Classification (IPC):  H02J 1/00(2006.01) (86) International application number: PCT/CN2014/073025 (87) International publication number: WO 2015/131385 (11.09.2015 Gazette 2015/36)

(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 (71) Applicant: Nokia Technologies Oy 02610 Espoo (FI)	(72) Inventor: WANG, Zhancang Beijing 101121 (CN) (74) Representative: Nokia Corporation  Intellectual Property Department Karakaari 7 02610 Espoo 02610 Espoo (FI)