Title:
ユーザ端末、無線基地局、無線通信システムおよび無線通信方法
Document Type and Number:
Japanese Patent JP6595497
Kind Code:
B2
Abstract:
The present invention is designed to adequately carry out uplink communication in unlicensed bands in a radio communication system (LAA) that runs LTE in unlicensed bands. A user terminal has a control section that controls the transmission and receipt of a signal in a first frequency carrier in which LBT (Listen Before Talk) is configured or in a second frequency carrier in which LBT is not configured, and the control section controls the step of receiving a random access response and subsequent steps in random access procedures to be performed in the second frequency carrier, and, furthermore, controls uplink transmission to be carried out in the first frequency carrier after random access is established.
Inventors:
Kazuki Takeda
Hiroki Harada
Shinpei Yasukawa
Satoshi Nagata
Hiroki Harada
Shinpei Yasukawa
Satoshi Nagata
Application Number:
JP2016557516A
Publication Date:
October 23, 2019
Filing Date:
October 09, 2015
Export Citation:
Assignee:
Ntt docomo, Inc.
International Classes:
H04W74/08; H04W16/14; H04W72/04; H04W84/12
Foreign References:
| WO2012135998A1 | ||||
| US20140198748 | ||||
| GB2498988A |
Other References:
Kyocera,Design overview on LAA,3GPP TSG-RAN WG1#78b R1-144157,フランス,3GPP,2014年 9月27日,Sections 1,4
ZTE,Issues of PRACH transmission on Scell,3GPP TSG-RAN WG1#67 R1-113761,フランス,3GPP,2011年11月 9日,Section 2
NTT DOCOMO,PRACH power-control for dual connectivity,3GPP TSG-RAN WG1#78 R1-143224,フランス,3GPP,2014年 8月10日,Section 2.1
Sharp,Timing reference and Pathloss reference,3GPP TSG-RAN WG2#76 R2-115953,フランス,3GPP,2011年11月 8日,Section 2
LG Electronics,Remaining issues on multiple TA,3GPP TSG-RAN WG1#70 R1-123509,フランス,3GPP,2012年 8月 5日,Section 2
Ericsson,Initial discussion on solutions for identified LAA functionalities,3GPP TSG-RAN WG1#78b R1-144267,フランス,3GPP,2014年 9月27日,Section 2.2
ZTE,Issues of PRACH transmission on Scell,3GPP TSG-RAN WG1#67 R1-113761,フランス,3GPP,2011年11月 9日,Section 2
NTT DOCOMO,PRACH power-control for dual connectivity,3GPP TSG-RAN WG1#78 R1-143224,フランス,3GPP,2014年 8月10日,Section 2.1
Sharp,Timing reference and Pathloss reference,3GPP TSG-RAN WG2#76 R2-115953,フランス,3GPP,2011年11月 8日,Section 2
LG Electronics,Remaining issues on multiple TA,3GPP TSG-RAN WG1#70 R1-123509,フランス,3GPP,2012年 8月 5日,Section 2
Ericsson,Initial discussion on solutions for identified LAA functionalities,3GPP TSG-RAN WG1#78b R1-144267,フランス,3GPP,2014年 9月27日,Section 2.2
Attorney, Agent or Firm:
Hiroyoshi Aoki
Amada Masayuki
Moriya Yoshitaka
Yoko Furuse
Amada Masayuki
Moriya Yoshitaka
Yoko Furuse