Terminal apparatus, base station apparatus, communication method, and integrated circuit
A terminal apparatus increments a transmit counter based on a failure of random access response reception or contention resolution, and receives information for indicating a higher layer parameter powerRampingStep( 1 ) and information for indicating a higher layer parameter powerRampingStep( 2 ). A transmit power for PRACH transmission in a first step of a 2 step contention based random access procedure is given based at least on the transmission counter and the higher layer parameter powerRampingStep( 1 ), and a transmit power for PUSCH transmission in the first step of the 2 step contention based random access procedure is given based at least on the transmission counter and the higher layer parameter powerRampingStep( 2 ).
1. A terminal device comprising:
control circuitry configured to control a 2-step contention based random-access procedure and a 4-step contention based random-access procedure; and
transmission circuitry configured to transmit a physical random access channel with a random access preamble in a first step of the 2-step contention based random-access procedure or in a first step of the 4-step contention based random-access procedure; wherein
transmission power for the physical random access channel is given at least based on a PREAMBLE_RECEIVED_TARGET_POWER;
for the 4-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 0 ) and a powerRampingStep( 0 ); and
for the 2-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 1 ) and a powerRampingStep( 1 ).
2. The terminal device according to claim 1 , wherein
the preambleInitialReceivedTargetPower( 0 ) and the preambleInitialReceivedTargetPower( 1 ) and the powerRampingStep( 0 ) and the powerRampingStep( 1 ) are given by radio resource control information.
3. The terminal device according to claim 1 , wherein
the powerRampingStep( 0 ) is a step size for power ramping up for the PREAMBLE_RECEIVED_TARGET_POWER for the 4-step contention based random access procedure, and
the powerRampingStep( 1 ) is a step size for power ramping up for the PREAMBLE_RECEIVED_TARGET_POWER for the 2-step contention based random access procedure.
4. A base station device comprising:
control circuitry configured to control a 2-step contention based random-access procedure and a 4-step contention based random-access procedure; and
reception circuitry configured to receive a physical random access channel with a random access preamble in a first step of the 2-step contention based random-access procedure or in a first step of the 4-step contention based random-access procedure; wherein
transmission power for the physical random access channel is given based at least on a PREAMBLE_RECEIVED_TARGET_POWER;
for the 4-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 0 ) and a powerRampingStep( 0 ); and
for the 2-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 1 ) and a powerRampingStep( 1 ).
5. The base station device according to claim 4 , wherein
the preambleInitialReceivedTargetPower( 0 ) and the preambleInitialReceivedTargetPower( 1 ) and the powerRampingStep( 0 ) and the powerRampingStep( 1 ) are given by radio resource control information.
6. The base station device according to claim 4 , wherein
the powerRampingStep( 0 ) is a step size for power ramping up for the PREAMBLE_RECEIVED_TARGET_POWER for the 4-step contention based random access procedure, and
the powerRampingStep( 1 ) is a step size for power ramping up for the PREAMBLE_RECEIVED_TARGET_POWER for the 2-step contention based random access procedure.
7. A communication method used for a terminal device comprising:
controlling a 2-step contention based random-access procedure and a 4-step contention based random-access procedure; and
transmitting a physical random access channel with a random access preamble in a first step of the 2-step contention based random-access procedure or in a first step of the 4-step contention based random-access procedure; wherein
transmission power for the physical random access channel is given based at least on a PREAMBLE_RECEIVED_TARGET_POWER;
for the 4-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 0 ) and a powerRampingStep( 0 ); and
for the 2-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 1 ) and a powerRampingStep( 1 ).
8. A communication method used for a base station device comprising:
controlling a 2-step contention based random-access procedure and a 4-step contention based random-access procedure; and
receiving a physical random access channel with a random access preamble in a first step of the 2-step contention based random-access procedure or in a first step of the 4-step contention based random-access procedure; wherein
transmission power for the physical random access channel is given based at least on a PREAMBLE_RECEIVED_TARGET_POWER;
for the 4-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 0 ) and a powerRampingStep( 0 ); and
for the 2-step contention based random access procedure, the PREAMBLE_RECEIVED_TARGET_POWER is given based at least on a preambleInitialReceivedTargetPower( 1 ) and a powerRampingStep( 1 ).