US 10,341,996 B2
User apparatus and uplink control information bit width determination method
Hideaki Takahashi, Tokyo (JP); and Kazuaki Takeda, Tokyo (JP)
Assigned to NTT DOCOMO, INC., Tokyo (JP)
Appl. No. 15/567,715
Filed by NTT DOCOMO, INC., Tokyo (JP)
PCT Filed Jun. 23, 2016, PCT No. PCT/JP2016/068728
§ 371(c)(1), (2) Date Oct. 19, 2017,
PCT Pub. No. WO2016/208693, PCT Pub. Date Dec. 29, 2016.
Claims priority of application No. 2015-129326 (JP), filed on Jun. 26, 2015.
Prior Publication US 2018/0124774 A1, May 3, 2018
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 72/04 (2009.01); H04W 8/24 (2009.01); H04W 16/28 (2009.01); H04B 7/0413 (2017.01); H04B 7/06 (2006.01); H04B 7/0417 (2017.01); H04W 24/10 (2009.01)
CPC H04W 72/0413 (2013.01) [H04B 7/0413 (2013.01); H04B 7/0697 (2013.01); H04W 8/24 (2013.01); H04W 16/28 (2013.01); H04B 7/0417 (2013.01); H04B 7/063 (2013.01); H04W 24/10 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A user apparatus configured to perform communication with a base station in a mobile communication system that supports downlink spatial multiplexing, comprising:
a transmitter that transmits capability information of the user apparatus to the base station, wherein the capability information comprises a user equipment category and a number of supported MIMO layers for a specific transmission mode;
a receiver that receives configuration information from the base station, wherein the configuration information comprises:
a parameter indicating a transmission mode corresponding to the downlink spatial multiplexing and
predetermined additional information; and
a processor that determines a bit width of a rank indicator based on the predetermined additional information,
wherein before determining the bit width of the rank indicator, the user apparatus determines whether the predetermined additional information is a maximum number of MIMO layers transmitted from the base station as information to be used for determining a bit width of the rank indicator.