US 12,395,226 B2
Terminal, communication method, base station, and system for random access procedure
Yuki Matsumura, Tokyo (JP); Satoshi Nagata, Tokyo (JP); Jing Wang, Beijing (CN); and Xiaolin Hou, Beijing (CN)
Assigned to NTT DOCOMO, INC., Tokyo (JP)
Appl. No. 17/265,287
Filed by NTT DOCOMO, INC., Tokyo (JP)
PCT Filed Aug. 3, 2018, PCT No. PCT/JP2018/029316
§ 371(c)(1), (2) Date Feb. 2, 2021,
PCT Pub. No. WO2020/026455, PCT Pub. Date Feb. 6, 2020.
Prior Publication US 2021/0307076 A1, Sep. 30, 2021
Int. Cl. H04W 74/0833 (2024.01)
CPC H04W 74/0833 (2013.01) 7 Claims
OG exemplary drawing
 
7. A system comprising a base station and a terminal, wherein:
the base station comprising:
a first processor that initiates a radio resource control (RRC) reconfiguration procedure;
the terminal comprising:
a second processor that,
when a single transmission configuration indicator (TCI) state is configured, by radio resource control (RRC) signaling, for a control resource set (CORESET) other than a CORESET with an index of 0, assumes that the single TCI state corresponds to the CORESET other than the CORESET with the index of 0, and
when a plurality of TCI states is configured, by RRC signaling, for the CORESET other than the CORESET with the index 0 in an RRC reconfiguration, in response not to activate any one of the plurality of TCI states by a Medium Access Control Control Element (MAC CE) activation command for the CORESET other than the CORESET with the index of 0, assumes that a demodulation reference signal (DMRS) antenna port associated with a physical downlink control channel (PDCCH) is quasi co-located with a synchronization signal block identified during a random access procedure during the RRC reconfiguration or a channel state information reference signal identified during the random access procedure during the RRC reconfiguration; and
a receiver that receives the PDCCH,
wherein, when the single TCI state is configured for the CORESET other than the CORESET with the index of 0, the second processor assumes that the DMRS antenna port associated with the PDCCH is quasi co-located with the single TCI state and the receiver receives the PDCCH.