Terminals, base stations, and integrated circuits

Abstract

This enables appropriate timing control in response to the propagation delay between the terminal and the base station. [Solution] The terminal comprises a control circuit that determines a transmission opportunity using a cell-specific offset based on a control signal for uplink transmission, and a transmission circuit that performs a PRACH transmission at the transmission opportunity. The control signal is downlink control information corresponding to a PDCCH order that triggers a PRACH transmission using a downlink control channel (PDCCH), and includes an SSB index. When a PRACH transmission is triggered by a PDCCH order, the control circuit determines a RACH occasion (RO) corresponding to the SSB indicated by the SSB index and later than the timing based on the cell-specific offset as the transmission opportunity.

Claims

1. A control circuit that determines the transmission opportunity using a cell-specific offset based on a control signal for uplink transmission, In the aforementioned transmission opportunity, a transmission circuit that performs physical random access channel (PRACH) transmission, It is equipped with, The control signal is downlink control information corresponding to a PDCCH order that triggers the PRACH transmission using a downlink control channel (Physical Downlink Control Channel (PDCCH)), and includes an SSB (Synchronization Signal (SS) / Physical Broadcast Channel Block (PBCH)) index. When the PRACH transmission is triggered by the PDCCH order, the control circuit determines the transmission opportunity to be a RACH occasion (RO) that corresponds to the SSB indicated by the SSB index and is later than the timing based on the cell-specific offset. Terminal.

2. A control circuit that determines a transmission opportunity using a cell-specific offset based on a control signal related to uplink reception, In the aforementioned transmission opportunity, a receiving circuit that performs physical random access channel (PRACH) reception, It is equipped with, The control circuit generates downlink control information corresponding to the PDCCH order that triggers the reception of the PRACH by the terminal using a downlink control channel (Physical Downlink Control Channel (PDCCH)). The aforementioned downlink control information includes an SSB (Synchronization Signal (SS) / Physical Broadcast Channel Block (PBCH)) index, When the PRACH reception is triggered by the PDCCH order, the control circuit determines the RACH occasion (RO) as the transmission opportunity, which corresponds to the SSB indicated by the SSB index and is later than the timing based on the cell-specific offset. Base station.

3. For physical random access channel (PRACH) transmissions in response to Physical Downlink Control Channel (PDCCH) orders received via the downlink control channel, the system includes a control circuit that determines the transmission opportunity using a cell-specific offset. The control information corresponding to the aforementioned PDCCH order includes an SSB (Synchronization Signal (SS) / Physical Broadcast Channel Block (PBCH)) index, The control circuit determines the RACH occasion (RO) indicated by the SSB index as the transmission opportunity if the RO occurs after the timing based on the cell-specific offset. Integrated circuit.

4. A control circuit that determines a transmission opportunity using a cell-specific offset based on a control signal related to uplink reception, A receiving circuit that performs physical random access channel (PRACH) reception during the aforementioned transmission opportunity, Equipped with, The control circuit generates downlink control information corresponding to the PDCCH order that triggers the reception of the PRACH by the terminal using a downlink control channel (Physical Downlink Control Channel (PDCCH)). The aforementioned downlink control information includes an SSB (Synchronization Signal (SS) / Physical Broadcast Channel Block (PBCH)) index, When the PRACH reception is triggered by the PDCCH order, the control circuit determines the RACH occasion (RO) as the transmission opportunity, which corresponds to the SSB indicated by the SSB index and is later than the timing based on the cell-specific offset. Integrated circuit.

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