US 12,244,529 B2
Method for transmitting and receiving demodulation reference signal in wireless communication system and device therefor
Kyuseok Kim, Seoul (KR); Hyungtae Kim, Seoul (KR); Jiwon Kang, Seoul (KR); and Kilbom Lee, Seoul (KR)
Assigned to LG Electronics Inc., Seoul (KR)
Appl. No. 17/608,329
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed May 4, 2020, PCT No. PCT/KR2020/005868
§ 371(c)(1), (2) Date Nov. 2, 2021,
PCT Pub. No. WO2020/222604, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 10-2019-0051874 (KR), filed on May 2, 2019; application No. 10-2019-0055308 (KR), filed on May 10, 2019; and application No. 10-2019-0123430 (KR), filed on Oct. 4, 2019.
Prior Publication US 2022/0224471 A1, Jul. 14, 2022
Int. Cl. H04L 5/00 (2006.01); H04B 7/0413 (2017.01); H04W 72/23 (2023.01)
CPC H04L 5/0048 (2013.01) [H04B 7/0413 (2013.01); H04W 72/23 (2023.01)] 9 Claims
OG exemplary drawing
 
1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving activation information;
transmitting feedback information for the activation information;
receiving downlink control information (DCI) including i) a transmission configuration indication (TCI) field and ii) an antenna port field,
wherein an entry related to one or more Code Division Multiplexing (CDM) groups and one or more DeModulation Reference Signal (DMRS) ports is indicated based on the antenna port field,
wherein one or more TCI states are mapped to a codepoint of the TCI field of the DCI based on an activation command; and
receiving a phase tracking reference signal (PTRS) based on one or more PTRS ports,
wherein a number of the one or more PTRS ports is based on at least one of i) a number of the one or more TCI states based on the TCI field, ii) the number of the one or more CDM groups, or iii) a configured value of a maximum value of the number of the one or more PTRS ports,
wherein, based on i) the number of the one or more TCI states being 2 and ii) the number of the one or more CDM groups being 2:
a number of DMRS ports related to a first CDM group is 1,
a number of DMRS ports related to a second CDM group is 2, and
one of the one or more CDM groups includes a DMRS port 0 among the one or more DMRS ports based on the entry,
wherein the one or more DMRS ports are indexed by port indices, respectively, and
wherein the one or more CDM groups are indexed by CDM group indices, respectively.