CN-121986534-A - Terminal, wireless communication method and base station

Abstract

The terminal according to one embodiment of the present disclosure includes a reception unit that receives a specific downlink control channel (downlink control channel (DCI)) format in which a shared channel is scheduled, and a control unit that applies a specific Frequency Domain (FD) -orthogonal cover code (orthogonal cover code (OCC)) having a length of 4 to a demodulation reference signal (demodulation REFERENCE SIGNAL (DMRS)) of the shared channel, wherein the specific DCI format is a DCI format other than DCI formats 1_1, 1_2, 0_1, and 0_2.

Inventors

• MATSUMURA YUSUKE
• NAGATA AKIRA

Assignees

• 株式会社NTT都科摩

Dates

Publication Date

20260505

Application Date

20241001

Priority Date

20231010

Claims (6)

1. 1. A terminal, comprising: A receiving unit for receiving a DCI format which is a specific downlink control channel format for scheduling a shared channel, and A control unit configured to apply a specific frequency domain-orthogonal cover code having a length of 4, that is, a specific FD-OCC, to a DMRS, which is a demodulation reference signal of the shared channel, The specific DCI format is a DCI format other than DCI formats 1_1, 1_2, 0_1 and 0_2.
2. 2. The terminal of claim 1, wherein, The receiving unit receives a setting of a DMRS for a specific shared channel mapping type corresponding to the specific DCI format, The setting indicates that the specific FD-OCC is applied to the DMRS.
3. 3. The terminal of claim 1, wherein, The shared channel is a multicast physical downlink shared channel, i.e., a multicast PDSCH.
4. 4. The terminal of claim 1, wherein, The shared channel is a plurality of PDSCH, which is a plurality of physical downlink shared channels extending over a plurality of cells, and 1 of the plurality of PDSCH is scheduled for each of 1 of the plurality of cells.
5. 5. A wireless communication method for a terminal includes: a step of receiving a specific downlink control channel format (DCI format) for scheduling a shared channel, and A step of applying a specific frequency domain-orthogonal cover code of length 4, that is, a specific FD-OCC to a demodulation reference signal of the shared channel, that is, DMRS, The specific DCI format is a DCI format other than DCI formats 1_1, 1_2, 0_1 and 0_2.
6. 6. A base station, comprising: A transmitting unit for transmitting a DCI format which is a specific downlink control channel format for scheduling a shared channel, and A control unit configured to apply a specific frequency domain-orthogonal cover code having a length of 4, that is, a specific FD-OCC, to a DMRS, which is a demodulation reference signal of the shared channel, The specific DCI format is a DCI format other than DCI formats 1_1, 1_2, 0_1 and 0_2.

Description

Terminal, wireless communication method and base station Technical Field The present disclosure relates to a terminal, a wireless communication method, and a base station in a next generation mobile communication system. Background In a universal mobile telecommunications system (Universal Mobile Telecommunications System (UMTS)) network, long term evolution (Long Term Evolution (LTE)) is standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further large capacity, high altitude, and the like of LTE (third generation partnership project (Third Generation Partnership Project) (3 GPP (registered trademark)) versions (Release (rel.)) 8 and 9, LTE-Advanced (3 GPP rel.10-14) has been standardized. Subsequent systems of LTE (e.g., also referred to as fifth generation mobile communication system (5 th generation mobile communication system (5G)), 5g+ (plus), sixth generation mobile communication system (6 th generation mobile communication system (6G)), new Radio (NR)), 3gpp rel.15 and so on) have also been studied. Prior art literature Non-patent literature Non-patent document 1：3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access （E-UTRA） and Evolved Universal Terrestrial Radio Access Network （E-UTRAN）; Overall description; Stage 2 （Release 8）",2010, month 4 Disclosure of Invention Problems to be solved by the invention For orthogonalization of layers and the like, reference signals of a plurality of ports, for example, demodulation reference signals (DeModulation REFERENCE SIGNAL (DMRS)), are used. In future wireless communication systems, research is underway to increase the number of DMRS ports compared to existing specifications. The setting of DMRS in this case has not been fully studied. If the DMRS is not properly set and applied, there is a concern that the communication throughput/communication quality may deteriorate. Accordingly, it is an object of the present disclosure to provide a terminal, a wireless communication method, and a base station applying an appropriate DMRS. Means for solving the problems The terminal according to one embodiment of the present disclosure includes a reception unit that receives a specific downlink control channel (downlink control channel (DCI)) format in which a shared channel is scheduled, and a control unit that applies a specific Frequency Domain (FD) -orthogonal cover code (orthogonal cover code (OCC)) having a length of 4 to a demodulation reference signal (demodulation REFERENCE SIGNAL (DMRS)) of the shared channel, wherein the specific DCI format is a DCI format other than DCI formats 1_1, 1_2, 0_1, and 0_2. Effects of the invention According to one aspect of the present disclosure, an appropriate DMRS can be applied. Drawings Fig. 1A to 1B are examples of conventional DMRS port tables showing DMRS setting types 1/2 for PDSCH. Fig. 2A-2B are examples of existing DMRS port tables showing DMRS setting types 1/2 for PUSCH. Fig. 3A to 3B show an example of association of CDM groups, DMRS ports, and OCCs in spreading type 1/spreading type 2. Fig. 4 shows an example of parameters for PDSCH DMRS setting type 1. Fig. 5 shows an example of parameters for PDSCH DMRS setting type 2. Fig. 6 shows an example of parameters for PUSCH DMRS setting type 1. Fig. 7 shows an example of parameters for PUSCH DMRS setting type 2. Fig. 8 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. Fig. 9 is a diagram showing an example of a configuration of a base station according to an embodiment. Fig. 10 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Fig. 11 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 12 is a diagram showing an example of a vehicle according to an embodiment. Detailed Description (DMRS) A preamble (front-loaded) demodulation reference signal (DeModulation REFERENCE SIGNAL (DMRS)) is the original (1 st symbol or symbol near 1 st) DMRS used for earlier demodulation. For high-speed mobile terminals (terminals), user terminals (User Equipment), user Equipments (UEs), or high modulation and coding schemes (modulation and coding scheme (MCS))/rank (rank), additional DMRS can be set by RRC. The frequency position of the additional DMRS is the same as that of the pre-DMRS. For the time domain, DMRS mapping type a or B is set. In DMRS mapping type a, DMRS position l_0 is counted by symbol index within a slot. l_0 is set by a parameter (dmrs-TypeA-Position) within MIB or common serving cell settings (ServingCellConfigCommon). DMRS position 0 (reference point l) means the first symbol of the slot or each hop. In DMRS mapping type B, DMRS position l_0 is counted by symbol index within PDSCH/PUSCH. l_0 is always 0.DMRS position 0 (reference point l) means PDSCH/PUSCH or the first symb