US 12,267,156 B2
Terminal, radio communication method, and system
Yuki Matsumura, Tokyo (JP); Shohei Yoshioka, Tokyo (JP); and Satoshi Nagata, Tokyo (JP)
Assigned to NTT DOCOMO, INC., Tokyo (JP)
Filed by NTT DOCOMO, INC., Tokyo (JP)
Filed on Feb. 16, 2023, as Appl. No. 18/170,133.
Application 18/170,133 is a continuation of application No. 17/057,475, abandoned, previously published as PCT/JP2019/020402, filed on May 23, 2019.
Claims priority of application No. 2018-110697 (JP), filed on May 23, 2018.
Prior Publication US 2023/0198656 A1, Jun. 22, 2023
Int. Cl. H04L 1/00 (2006.01); H04L 1/1867 (2023.01); H04L 5/00 (2006.01); H04W 72/0446 (2023.01); H04W 72/23 (2023.01)
CPC H04L 1/0004 (2013.01) [H04L 1/0003 (2013.01); H04L 1/189 (2013.01); H04L 5/0048 (2013.01); H04W 72/0446 (2013.01); H04W 72/23 (2023.01)] 4 Claims
OG exemplary drawing
 
1. A terminal comprising:
a processor that determines, when retransmission of a side channel in a communication between a plurality of terminals is performed, a modulation order for the retransmission of the side channel by using a Modulation and Coding Scheme (MCS) table based on information indicating the MCS table which indicates 256 Quadrature Amplitude Modulation (256QAM) as a modulation scheme and based on side control information;
a transmitter that transmits the side channel based on the determined modulation order; and
a receiver that receives downlink control information including at least an Uplink Shared Channel (UL-SCH) indicator field; and
wherein, the processor, if retransmission of an uplink shared channel is performed, determines a time density of a phase tracking reference signal (PTRS) based on whether a MCS index is larger than a certain value,
wherein the transmitter transmits the PTRS,
wherein the time density of the PTRS is determined according to an MCS index threshold indicated in a higher layer, and
wherein, when a value of the UL-SCH indicator field indicates an uplink shared channel without an uplink data, if the MCS index is larger than the certain value, the time density of the PTRS is determined based on an MCS index notified in an initial transmission which is smaller than or equal to the certain value, and if the MCS index is smaller than or equal to the certain value, the time density of the PTRS is determined based on the MCS index and a correspondence between MCS indices and PTRS time densities.