Terminal apparatus, base station apparatus, and communication method
There is provided a terminal apparatus to transmit a first random access preamble using a first precoding, monitor a random access response corresponding to the first random access preamble, increment a value of a counter in a case that a reception of the random access response is not successful, and transmit a second random access preamble using a second precoding, if the value of the counter does not reach a predetermined value in a case that the value of the counter is incremented.
1. A terminal apparatus comprising:
transmission circuitry configured to transmit a random access preamble to a base station apparatus;
reception circuitry configured to monitor a random access response corresponding to the random access preamble; and
higher layer operation circuitry configured to increment a first counter in a case that the random access response is not received within a duration of a random access response window and increment a second counter which is different with the first counter, the first counter being for a retransmission of the random access preamble, and the second counter being for calculating a power of the random access preamble, wherein
the higher layer operation circuitry is configured to
determine whether or not a first value of the first counter exceeds a maximum number of transmission of the random access preamble,
increment the second counter in a case that the random access response is not received within the duration of the random access response window and a condition on an uplink transmission beam is satisfied at a time of retransmission of the random access preamble, and
set a target reception power P TARGET for the random access preamble, the target reception power P TARGET including a power of preamble, a power based on a second value of the second counter and a power offset based on preamble format, the power based on the second value of the second counter is indicated by (the second value of the second counter−1)*power ramping step, the power of preamble, the power offset based on preamble format and the power ramping step being based on a higher layer signaling.
2. A communication method used for a terminal apparatus, the communication method comprising:
transmitting a random access preamble to a base station apparatus;
monitoring a random access response corresponding to the random access preamble;
incrementing a first counter in a case that the random access response is not received within a duration of a random access response window, and
incrementing a second counter which is different with the first counter,
the first counter being for a retransmission of the random access preamble, and the second counter being for calculating a power of the random access preamble;
determining whether or not a first value of the first counter exceeds a maximum number of transmission of the random access preamble;
incrementing the second counter in a case that the random access response is not received within the duration of the random access response window and a condition on an uplink transmission beam is satisfied at a time of retransmission of the random access preamble; and
setting a target reception power P TARGET for the random access preamble, the target reception power P TARGET including a power of preamble, a power based on a second value of the second counter and a power offset based on preamble format, the power based on the second value of the second counter is indicated by (the second value of the second counter−1)*power ramping step, the power of preamble, the power offset based on preamble format and the power ramping step being based on a higher layer signaling.
3. A base station apparatus comprising:
reception circuitry configured to receive a random access preamble from a terminal apparatus; and
transmission circuitry configured to transmit a random access response corresponding to the random access preamble, wherein:
a first counter is incremented in a case that the random access response is not received within a duration of a random access response window;
a second counter which is different with the first counter is incremented in a case that the random access response is not received within the duration of the random access response window and a condition on an uplink transmission beam is satisfied at a time of retransmission of the random access preamble;
the first counter is for a retransmission of the random access preamble, the second counter is for calculating a power of the random access preamble;
a first value of the first counter is used to determine whether or not a maximum number of transmission of the random access preamble is exceeded; and
a second value of the second counter is used to set a target reception power P TARGET for the random access preamble, the target reception power P TARGET including a power of preamble, a power based on the second value of the second counter and a power offset based on preamble format, the power based on the second value of the second counter is indicated by (the second value of the second counter−1)*power ramping step, the power of preamble, the power offset based on preamble format and the power ramping step being based on a higher layer signaling.
4. A communication method used for a base station apparatus, the communication method comprising:
receiving a random access preamble from a terminal apparatus; and
transmitting a random access response corresponding to the random access preamble, wherein:
a first counter is incremented in a case that the random access response is not received within a duration of a random access response window;
a second counter which is different with the first counter is incremented in a case that the random access response is not received within the duration of the random access response window and a condition on an uplink transmission beam is satisfied at a time of retransmission of the random access preamble;
the first counter is for a retransmission of the random access preamble, the second counter is for calculating a power of the random access preamble;
a first value of the first counter is used to determine whether or not a maximum number of transmission of the random access preamble is exceeded; and
a second value of the second counter is used to set a target reception power P TARGET for the random access preamble, the target reception power P TARGET including a power of preamble, a power based on the second value of the second counter and a power offset based on preamble format, the power based on the second value of the second counter is indicated by (the second value of the second counter−1)*power ramping step, the power of preamble, the power offset based on preamble format and the power ramping step being based on a higher layer signaling.