# US 12,225,471 B2 · Terminal and radio communication method

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- Number: US 12,225,471 B2
- Document ID: US12225471B2
- Status: Granted
- Kind: B2
- Application number: 17/617,813
- Filed: 2019-06-13
- Published: 2022-07-21
- Granted: 2025-02-11
- Earliest claimed: 2019-06-13
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Yuki Matsumura; Satoshi Nagata
- Web page: https://patentgrep.com/patent/US12225471B2

## CPC

- H04W 52/146: {Uplink power control}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W 52/242: {taking into account path loss}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 80/02: Data link layer protocols
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A terminal according to one aspect of the present disclosure includes: a control section that determines a reference signal for pathloss reference for a physical uplink shared channel (PUSCH), based on any one of reception of a medium access control control element (MAC CE) and transmission of a random access channel; and a transmitting section that transmits the PUSCH by using transmission power based on the reference signal for pathloss reference. According to one aspect of the present disclosure, a parameter for transmission power control can be appropriately determined.

## Claims

### Claim 1

A terminal comprising:
a receiver that receives a configuration of a physical uplink shared channel (PUSCH), receives a medium access control-control element (MAC CE), and receives downlink control information scheduling the PUSCH; and
a controller that controls transmission of the PUSCH,
wherein when the configuration includes a list including values of a sounding reference signal resource indicator (SRI) field and IDs of reference signals for pathloss reference for the PUSCH, when the IDs correspond to the values respectively, when the MAC CE indicates a specific ID of a reference signal for pathloss reference corresponding to a specific value among the values, and when the downlink control information includes an SRI field indicating the specific value, the controller uses, for pathloss estimation of the PUSCH, the reference signal corresponding to the specific ID, and
when the reference signals are not configured, and when the MAC CE indicates a transmission configuration indication (TCI) state for a physical downlink control channel (PDCCH), the controller uses, for pathloss estimation of the PUSCH, a downlink reference signal in the TCI state with a quasi co-location type of a spatial reception parameter.

### Claim 2

A radio communication method for a terminal, comprising:
receiving a configuration of a physical uplink shared channel (PUSCH);
receiving a medium access control-control element (MAC CE);
receiving downlink control information scheduling the PUSCH; and
controlling reception of the PUSCH,
wherein when the configuration includes a list including values of a sounding reference signal resource indicator (SRI) field and IDs of reference signals for pathloss reference for the PUSCH, when the IDs correspond to the values respectively, when the MAC CE indicates a specific ID of a reference signal for pathloss reference corresponding to a specific value among the values, and when the downlink control information includes an SRI field indicating the specific value, the terminal uses, for pathloss estimation of the PUSCH, the reference signal corresponding to the specific ID, and
when the reference signals are not configured, and when the MAC CE indicates a transmission configuration indication (TCI) state for a physical downlink control channel (PDCCH), the terminal uses, for pathloss estimation of the PUSCH, a downlink reference signal in the TCI state with a quasi co-location type of a spatial reception parameter.

### Claim 3

A base station comprising:
a transmitter that transmits a configuration of a physical uplink shared channel (PUSCH), transmits a medium access control-control element (MAC CE), and transmits downlink control information scheduling the PUSCH; and
a controller that controls reception of the PUSCH,
wherein when the configuration includes a list including values of a sounding reference signal resource indicator (SRI) field and IDs of reference signals for pathloss reference for the PUSCH, when the IDs correspond to the values respectively, when the MAC CE indicates a specific ID of a reference signal for pathloss reference corresponding to a specific value among the values, and when the downlink control information includes an SRI field indicating the specific value, the reference signal corresponding to the specific ID is used for pathloss estimation of the PUSCH, and
when the reference signals are not configured, and when the MAC CE indicates a transmission configuration indication (TCI) state for a physical downlink control channel (PDCCH), a downlink reference signal in the TCI state with a quasi co-location type of a spatial reception parameter is used for pathloss estimation of the PUSCH.

### Claim 4

A system comprising a terminal and a base station, wherein
the terminal comprises:
a receiver that receives a configuration of a physical uplink shared channel (PUSCH), receives a medium access control-control element (MAC CE), and receives downlink control information scheduling the PUSCH; and
a controller that controls transmission of the PUSCH, and
the base station transmits the configuration, transmits the MAC CE, and transmits the downlink control information,
when the configuration includes a list including values of a sounding reference signal resource indicator (SRI) field and IDs of reference signals for pathloss reference for the PUSCH, when the IDs correspond to the values respectively, when the MAC CE indicates a specific ID of a reference signal for pathloss reference corresponding to a specific value among the values, and when the downlink control information includes an SRI field indicating the specific value the specific value, the controller uses, for pathloss estimation of the PUSCH, the reference signal corresponding to the specific ID, and
when the reference signals are not configured, and when the MAC CE indicates a transmission configuration indication (TCI) state for a physical downlink control channel (PDCCH), the controller uses, for pathloss estimation of the PUSCH, a downlink reference signal in the TCI state with a quasi co-location type of a spatial reception parameter.