Terminal apparatus, base station apparatus, communication method, and integrated circuit
A terminal apparatus ( 1, 1 A, 1 B) includes: a receiver ( 10 ) configured to receive preamble index information on a physical downlink control channel; and a transmitter ( 10 ) configured to, in a case where the preamble index information indicates a prescribed value, select a block from one or more blocks to transmit a random access preamble based on the block selected, and in a case where the preamble index information indicates a value other than the prescribed value, transmit the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein the block includes four OFDM symbols to which at least a synchronization signal and a physical broadcast channel are mapped.
1. A terminal apparatus comprising:
a receiver configured to receive preamble index information on a physical downlink control channel; and
a transmitter configured to:
in a case where the preamble index information indicates a prescribed value, select a block from multiple blocks based on results of monitoring the multiple blocks and transmit a random access preamble based on the block selected, and
in a case where the preamble index information indicates a value other than the prescribed value, transmit the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein
the block selected includes four Orthogonal Frequency Division Multiplexing (OFDM) symbols to which at least a physical broadcast channel is mapped.
2. A base station apparatus comprising:
a transmitter configured to transmit preamble index information on a physical downlink control channel; and
a receiver configured to:
in a case where the preamble index information indicates a prescribed value, receive a random access preamble based on a block selected from multiple blocks by a terminal apparatus based on results of monitoring the multiple blocks, and
in a case where the preamble index information indicates a value other than the prescribed value, receive the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein
the block selected includes four Orthogonal Frequency Division Multiplexing (OFDM) symbols to which at least a physical broadcast channel is mapped.
3. A communication method used for a terminal apparatus, the communication method comprising:
receiving preamble index information on a physical downlink control channel; and
selecting, in a case where the preamble index information indicates a prescribed value, a block from multiple blocks based on results of monitoring the multiple blocks to transmit a random access preamble based on the block selected, and
transmitting, in a case where the preamble index information indicates a value other than the prescribed value, the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein
the block selected includes four Orthogonal Frequency Division Multiplexing (OFDM) symbols to which at least a physical broadcast channel is mapped.
4. A communication method used for a base station apparatus, the communication method comprising:
transmitting preamble index information on a physical downlink control channel; and
receiving, in a case where the preamble index information indicates a prescribed value, a random access preamble based on a block selected from multiple blocks by a terminal apparatus based on results of monitoring the multiple blocks, and
receiving, in a case where the preamble index information indicates a value other than the prescribed value, the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein
the block selected includes four Orthogonal Frequency Division Multiplexing (OFDM) symbols to which at least a physical broadcast channel is mapped.
5. An integrated circuit implemented on a terminal apparatus, the integrated circuit causing the terminal apparatus to perform:
receiving preamble index information on a physical downlink control channel;
selecting, in a case where the preamble index information indicates a prescribed value, a block from multiple blocks based on results of monitoring the multiple blocks and transmitting a random access preamble based on the block selected, and
transmitting, in a case where the preamble index information indicates a value other than the prescribed value, the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein
the block selected includes four Orthogonal Frequency Division Multiplexing (OFDM) symbols to which at least a physical broadcast channel is mapped.
6. An integrated circuit implemented on a base station apparatus, the integrated circuit causing the base station apparatus to perform:
transmitting preamble index information on a physical downlink control channel;
receiving, in a case where the preamble index information indicates a prescribed value, a random access preamble based on a block selected from multiple blocks by a terminal apparatus based on results of monitoring the multiple blocks, and
receiving, in a case where the preamble index information indicates a value other than the prescribed value, the random access preamble corresponding to a preamble index indicated by the preamble index information, wherein
the block selected includes four Orthogonal Frequency Division Multiplexing (OFDM) symbols to which at least a physical broadcast channel is mapped.