US 9,814,054 B2
Base station, user apparatus and interference reduction method
Yusuke Ohwatari, Tokyo (JP); Kazuaki Takeda, Tokyo (JP); Satoshi Nagata, Tokyo (JP); and Yousuke Sano, Tokyo (JP)
Assigned to NTT DOCOMO, INC., Tokyo (JP)
Appl. No. 14/905,002
Filed by NTT DOCOMO, INC., Tokyo (JP)
PCT Filed Jun. 16, 2014, PCT No. PCT/JP2014/065872
§ 371(c)(1), (2) Date Jan. 14, 2016,
PCT Pub. No. WO2015/008568, PCT Pub. Date Jan. 22, 2015.
Claims priority of application No. 2013-150732 (JP), filed on Jul. 19, 2013.
Prior Publication US 2016/0165616 A1, Jun. 9, 2016
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 72/08 (2009.01); H04L 5/00 (2006.01); H04W 72/04 (2009.01); H04W 92/20 (2009.01)
CPC H04W 72/082 (2013.01) [H04L 5/0032 (2013.01); H04L 5/0051 (2013.01); H04L 5/0073 (2013.01); H04W 72/042 (2013.01); H04W 92/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A base station connected to a user apparatus in a radio communication system, the base station comprising:
a receiving unit configured to receive from an interference base station first control information which is used by the user apparatus for reducing uplink interference signals from one or more cells formed by the interference base station or from another user apparatus by suppressing or canceling the interference signals;
a generation unit configured to generate second control information based on one or more pieces of the first control information received from the interference base station; and
a transmitting unit configured to transmit the second control information to the user apparatus by a downlink control signal,
wherein
the first control information is information used for channel estimation of a demodulation reference signal of physical uplink shared channel,
the downlink control signal is a higher layer signaling or downlink control information in a physical downlink control channel,
in the downlink control information, a predetermined information element based on a predetermined format is included, and
the generation unit, in a case where the second control information is transmitted as the downlink control information, generates the second control information in which the information elements in the downlink control information are partially removed or information included in the information element is partially removed.