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1. (WO2018145767) SYNCHRONIZATION FOR EXTENDED DRX

Pub. No.:    WO/2018/145767    International Application No.:    PCT/EP2017/053099
Publication Date: Fri Aug 17 01:59:59 CEST 2018 International Filing Date: Tue Feb 14 00:59:59 CET 2017
IPC: H04W 56/00
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: AXMON, Joakim
SIENKIEWICZ, Esther
Title: SYNCHRONIZATION FOR EXTENDED DRX
Abstract:
A wireless communication device in a 3GPP NB-loT wireless communication network operates during an inactivity period of an eDRX cycle. An activation procedure comprises calculating, in a time reference frame inherent to the wireless communication device, an earliest and a latest point in time for obtaining a narrowband master information block (MIB-NB) transmitted by a network node in a narrowband physical broadcast channel (NPBCH) during a single NPBCH transmission time interval. Between the calculated earliest point in time and latest point in time, radio receiver circuitry is activated in the wireless communication device and at least one radio subframe comprising the NPBCH is received and decoded. By this decoding, the MIB-NB is obtained, from which a system frame number (SFN) is read. A communication procedure then comprises activating the wireless communication device according to the eDRX cycle, and communicating, in a designated time interval as determined by the SFN, with the network node.