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JP-7857415-B2 - Terminals, wireless communication methods, base stations and systems

JP7857415B2JP 7857415 B2JP7857415 B2JP 7857415B2JP-7857415-B2

Inventors

  • 松村 祐輝
  • 永田 聡
  • ワン ジン

Assignees

  • 株式会社ＮＴＴドコモ

Dates

Publication Date
20260512
Application Date
20220928

Claims (7)

  1. A receiving unit that receives downlink control information (DCI) indicating a code point representing a combination of Unified Transmission Configuration Indication states (TCI states), The system includes a control unit that maintains a unified TCI state among multiple unified TCI states currently in use that is not instructed to be updated by the aforementioned combination, The aforementioned combination includes a terminal comprising a first downlink TCI state, a first uplink TCI state, a second downlink TCI state, and at least two of the second uplink TCI states.
  2. The first downlink TCI state and the first uplink TCI state correspond to the first transmit/receive point (TRP), The terminal according to claim 1, wherein the second downlink TCI state and the second uplink TCI state correspond to the second TRP.
  3. The receiving unit receives the upper layer parameters, The terminal according to claim 1, wherein the control unit determines, based on the setting of the upper layer parameters, whether to use a unified TCI state that uses a single transmit/receive point (TRP) or a unified TCI state that uses multiple TRPs.
  4. The terminal according to claim 1, further comprising a transmitting unit that transmits capability information indicating support for a unified TCI state utilizing multiple transmit/receive points (TRPs).
  5. The steps include receiving downlink control information (DCI) that indicates a code point representing a combination of Unified Transmission Configuration Indication states (TCI states), The process includes the step of maintaining a unified TCI state among several unified TCI states currently in use that is not instructed to be updated by the aforementioned combination, A wireless communication method for a terminal, wherein the combination includes at least two of a first downlink TCI state, a first uplink TCI state, a second downlink TCI state, and a second uplink TCI state.
  6. A transmitter unit that transmits downlink control information (DCI) that indicates a code point representing a combination of Unified Transmission Configuration Indication states (TCI states), The system includes a control unit that determines that, among multiple unified TCI states currently applied to the terminal, the unified TCI state that is not instructed to be updated by the aforementioned combination will be maintained in the terminal, The combination includes a base station comprising a first downlink TCI state, a first uplink TCI state, a second downlink TCI state, and at least two of the second uplink TCI states.
  7. A system including terminals and base stations, The aforementioned terminal is A receiving unit that receives downlink control information (DCI) indicating a code point representing a combination of Unified Transmission Configuration Indication states (TCI states), The system includes a control unit that maintains a unified TCI state among multiple unified TCI states currently in use that is not instructed to be updated by the aforementioned combination, The aforementioned combination includes at least two of the following: a first downlink TCI state, a first uplink TCI state, a second downlink TCI state, and a second uplink TCI state. The aforementioned base station is A system including a transmitting unit that transmits the DCI.

Description

This disclosure relates to terminals, wireless communication methods , base stations , and systems in next-generation mobile communication systems. In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified with the aim of achieving even higher data rates and lower latency (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP®) Release (Rel.) 8, 9). Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later) are also being considered. 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)”, April 2010 Figures 1A and 1B show an example of a unified/common TCI framework.Figures 2A and 2B show an example of a DCI-based TCI status indicator.Figures 3A and 3B show examples of RRC fields and DCI fields in Rel. 17.Figure 4 shows an example of a unified TCI state activation/deactivation MAC CE.Figure 5 shows an example of the DCI size according to the first embodiment.Figure 6 shows an example of the DCI size according to the second embodiment.Figure 7 shows another example of the DCI size according to the second embodiment.Figure 8 shows an example of the association between a TCI field code point and a TCI state according to the second embodiment.Figure 9 shows another example of the association between a TCI field code point and a TCI state according to the second embodiment.Figure 10 shows another example of the association between a TCI field code point and a TCI state according to the second embodiment.Figure 11 shows an example of a method for setting/activating/updating an index related to TRP according to the third embodiment.Figures 12A and 12B show an example of MAC CE according to the third embodiment.Figure 13 shows an example of MAC CE according to Embodiment 4-1.Figure 14 shows another example of MAC CE according to Embodiment 4-1.Figure 15 shows another example of MAC CE according to Embodiment 4-1.Figure 16 shows an example of MAC CE according to Embodiment 4-2.Figure 17 shows an example of a schematic configuration of a wireless communication system according to one embodiment.Figure 18 shows an example of the configuration of a base station according to one embodiment.Figure 19 shows an example of the configuration of a user terminal according to one embodiment.Figure 20 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment.Figure 21 shows an example of a vehicle according to one embodiment. (TCI, Spatial Relations, QCL) In NR, it is being considered to control the receive processing (e.g., at least one of reception, demapping, demodulation, and decoding) and the transmit processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) of at least one of the signal and channel (referred to as signal/channel) in the UE based on the Transmission Configuration Indication state (TCI state). The TCI state may represent the one applied to the downlink signal/channel. The equivalent of the TCI state applied to the uplink signal/channel may be expressed as a spatial relation. The TCI state is information regarding the quasi-co-location (QCL) of a signal/channel, and may also be called spatial reception parameters or spatial relation information. The TCI state may be set in the UE for each channel or signal. QCL is an index that indicates the statistical properties of a signal/channel. For example, if one signal/channel and another signal/channel have a QCL relationship, it may mean that we can assume that at least one of the following is identical between these different signals/channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter). The spatial reception parameters may correspond to the received beam of the UE (e.g., the received analog beam), and the beam may be identified based on the spatial QCL. In this disclosure, QCL (or at least one element of QCL) may be interpreted as sQCL (spatial QCL). Multiple types of QCLs (QCL types) may be defined. For example, four QCL types A-D may be provided, each with different parameters (or parameter sets) that can be assumed to be identical. The assumption by a User Engineer (UE) that one control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption. The UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of a signal/channel based on the TCI status or QCL assumption of the signal/channel. The TCI state