Terminal apparatus, base station apparatus, and communication method
Uplink communication is efficiently performed in non-allocated frequencies. The terminal apparatus includes: a reception unit configured to receive downlink control information on a PDCCH; and a transmission unit configured to transmit a random access preamble. For a first frame structure type, the downlink control information is used to configure a subframe number of a first uplink subframe in which transmission of the random access preamble is allowed. For a second frame structure type, the downlink control information is used to configure a subframe number of a second uplink subframe in which transmission of the random access preamble is allowed and a symbol number of an uplink symbol in the second uplink subframe.
1. A terminal apparatus comprising:
transmission circuitry configured to and/or programmed to transmit a random access preamble on a PRACH (Physical Random Access Channel), and
reception circuitry configured to and/or programmed to receive downlink control information with CRC (Cyclic Redundancy Check) parity bits scrambled by a RA-RNTI (Random Access-Radio Network Temporary Identifier), wherein
the RA-RNTI is determined at least based on an OFDM (Orthogonal Frequency-Division Multiplexing) symbol number at which the PRACH starts, and
the PRACH is configured, from a plurality of PRACHs each of which starts at a different OFDM symbol number in a time domain within a duration, based on a PRACH mask index included in a PDCCH order, the duration comprising 14 OFDM symbols.
2. The terminal apparatus according to claim 1 , wherein
the RA-RNTI is determined at least based on an index in addition to the OFDM symbol number,
the index is a duration number of the duration, 10 durations are included in a frame with 10 ms for the PRACH.
3. The terminal apparatus according to claim 2 , wherein
the duration is 1 ms.
4. A base station apparatus comprising:
reception circuitry configured to and/or programmed to receive a random access preamble on a PRACH (Physical Random Access Channel), and
transmission circuitry configured to and/or programmed to transmit downlink control information with CRC (Cyclic Redundancy Check) parity bits scrambled by a RA-RNTI (Random Access-Radio Network Temporary Identifier), wherein
the RA-RNTI is determined at least based on an OFDM (Orthogonal Frequency-Division Multiplexing) symbol number at which the PRACH starts, and
the PRACH is configured, from a plurality of PRACHs each of which starts at a different OFDM symbol number in a time domain within a duration, based on a PRACH mask index included in a PDCCH order, the duration comprising 14 OFDM symbols.
5. The base station apparatus according to claim 4 , wherein
the RA-RNTI is determined at least based on an index in addition to the OFDM symbol number,
the index is a duration number of the duration, 10 durations are included in a frame with 10 ms for the PRACH.
6. The base station apparatus according to claim 5 , wherein
the duration is 1 ms.
7. A communication method of a terminal apparatus, the communication method comprising the steps of:
transmitting a random access preamble on a PRACH (Physical Random Access Channel); and
receiving downlink control information with CRC (Cyclic Redundancy Check) parity bits scrambled by a RA-RNTI (Random Access-Radio Network Temporary Identifier), wherein
the RA-RNTI is determined at least based on an OFDM (Orthogonal Frequency-Division Multiplexing) symbol number at which the PRACH starts, and
the PRACH is configured, from a plurality of PRACHs each of which starts at a different OFDM symbol number in a time domain within a duration, based on a PRACH mask index included in a PDCCH order, the duration comprising 14 OFDM symbols.
8. A communication method of a base station apparatus, the communication method comprising the steps of:
receiving a random access preamble on a PRACH (Physical Random Access Channel); and
transmitting downlink control information with CRC (Cyclic Redundancy Check) parity bits scrambled by a RA-RNTI (Random Access-Radio Network Temporary Identifier), wherein
the RA-RNTI is determined at least based on an OFDM (Orthogonal Frequency-Division Multiplexing) symbol number at which the PRACH starts, and
the PRACH is configured, from a plurality of PRACHs each of which starts at a different OFDM symbol number in a time domain within a duration, based on a PRACH mask index included in a PDCCH order, the duration comprising 14 OFDM symbols.