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1. (WO2017057321) USER EQUIPMENT AND SYNCHRONIZATION METHOD

Pub. No.:    WO/2017/057321    International Application No.:    PCT/JP2016/078381
Publication Date: Fri Apr 07 01:59:59 CEST 2017 International Filing Date: Wed Sep 28 01:59:59 CEST 2016
IPC: H04W 56/00
H04W 92/18
Applicants: NTT DOCOMO, INC.
株式会社NTTドコモ
Inventors: YASUKAWA, Shimpei
安川 真平
NAGATA, Satoshi
永田 聡
HARADA, Hiroki
原田 浩樹
ZHAO, Qun
ジョウ チュン
ZENG, Yongbo
ゼン ユンボ
Title: USER EQUIPMENT AND SYNCHRONIZATION METHOD
Abstract:
The objective of the present invention is to provide a technique which allows a device-to-device (D2D) synchronization signal to be received efficiently. Provided is a piece of user equipment in a wireless communication system supporting D2D communication, the user equipment comprising: a receiving unit which receives a first synchronization signal transmitted from a base station, a second synchronization signal transmitted from another piece of user equipment, or either an external synchronization signal or external synchronization information transmitted from an external synchronization source; and a synchronization processing unit which carries out synchronization using the first synchronization signal, the second synchronization signal, or either the external synchronization signal or the external synchronization information, received by the receiving unit; wherein, if the user equipment is outside the coverage area of the base station or outside an area in which the external synchronization signal or the external synchronization information can be received, the receiving unit receives the second synchronization signal by performing an initial search within a time window prescribed for monitoring the second synchronization signal.