A mobile communication system and a mobile station

Japanese Patent JP5970489

B2

A technology is provided to specify a secondary cell on which a random access channel is to be transmitted when a random access procedure toward a secondary cell has occurred at user equipment. In a mobile communication system including a first base station, a second base station, and user equipment connected to the first base station as a master base station, upon triggering a random access procedure toward a cell of the second base station, the user equipment is configured to perform a contention based random access procedure on a secondary cell, based upon one of (a) selecting the secondary cell on which a random access signal is to be transmitted in accordance with an instruction from the first base station; (b) selecting the secondary cell on which the random access signal is to be transmitted using implicit information in the user equipment; and (c) determining autonomously at the user equipment the secondary cell on which the random access signal is to be transmitted.

WO/2013/010430	SERVICE DATA TRANSMISSION METHOD AND SYSTEM
WO/2008/041941	EDGE CONTINUED EVOLUTION, IMPROVED CHANNEL REQUEST METHOD AND SYSTEM
WO/2020/172022	USER-EQUIPMENT-COORDINATION SET FOR A WIRELESS NETWORK USING AN UNLICENSED FREQUENCY BAND

Toru Uchino
Hideaki Takahashi
Kazuki Takeda

JP2014016003A

August 17, 2016

January 30, 2014

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H04W74/08; H04W72/04

US20150223270

Samsung,Discussion on Random Access on SCell in inter-ENB CA,3GPP TSG-RAN WG2#84 R2-133866,2013年11月11日
Huawei, HiSilicon,Random access issues for supporting dual connectivity,3GPP TSG-RAN WG2#84 3GPP TSG-RAN WG2#84 R2-133973,2013年11月11日
NEC Corporation,Contention Based Random Access in SeNB,3GPP TSG-RAN WG2#84 3GPP TSG-RAN WG2#84 R2-134250,2013年11月11日

Tadashige Ito
Tadahiko Ito

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