Terminal apparatus, communication method, and integrated circuit
Provided is a terminal apparatus configured to receive a PDCCH including DCI format 1C to which CRC parity bits scrambled with a CC-RNTI are added, and to transmit a preamble in an LAA cell, wherein a type of an uplink LBT procedure for a PRACH transmission is determined based on whether or not a PRACH resource to be used for the PRACH transmission is at least included in a subframe in an uplink duration in which no downlink physical channel is received, and a value of the uplink duration is given based at least on an ‘Uplink transmission duration and offset indication’ field included in the DCI format 1C.
1. A terminal apparatus comprising:
reception circuitry configured to receive a downlink control information (DCI) format indicating uplink duration; and
transmission circuitry configured to transmit a physical random access channel (PRACH) by using a preamble and a a PRACH resource, the preamble being selected randomly by the terminal apparatus from a plurality of preambles, and the PRACH resource being configured by radio resource control (RRC) signaling,
wherein the transmission circuitry is configured to:
in a case that the PRACH resource is within the uplink duration, transmit the PRACH; and
in a case that the PRACH resource is outside of the uplink duration, not transmit the PRACH.
2. The terminal apparatus according to claim 1 , wherein
in a case that the PRACH resource is within the uplink duration, a transmission counter PREAMBLE_TRANSMISSION_COUNTER is incremented, and
in a case that the PRACH resource is outside of the uplink duration, the transmission counter PREAMBLE_TRANSMISSION_COUNTER is not incremented.
3. A base station apparatus comprising:
transmission circuitry configured to transmit a downlink control information (DCI) format indicating uplink duration; and
reception circuitry configured to receive a physical random access channel (PRACH) by using a preamble and a a PRACH resource, the preamble being selected randomly by the terminal apparatus from a plurality of preambles, and the PRACH resource being configured by radio resource control (RRC) signaling,
wherein the reception circuitry is configured to:
in a case that the PRACH resource is within the uplink duration, receive the PRACH; and
in a case that the PRACH resource is outside of the uplink duration, not receive the PRACH.
4. A communication method of a terminal apparatus comprising:
receiving a downlink control information (DCI) format indicating uplink duration;
transmitting a physical random access channel (PRACH) by using preamble and a PRACH resource, the preamble being selected randomly by the terminal apparatus from a plurality of preambles, and the PRACH resource being configured by radio resource control (RRC) signaling; and
not transmitting the PRACH, in a case that the PRACH resource is outside of the uplink duration.
5. A communication method of a base station apparatus comprising:
transmitting a downlink control information (DCI) format indicating uplink duration;
receiving a physical random access channel (PRACH) by using a preamble and a PRACH resource, the preamble being selected randomly by the terminal apparatus from a plurality of preambles, and the PRACH resource being configured by radio resource control signaling and
not receiving the PRACH, in a case that the PRACH resource is outside of the uplink duration.