Terminal apparatus, communication method, and integrated circuit
A terminal apparatus includes a monitor unit configured to monitor qualities of a plurality of links, each being associated with at least one reference signal, a controller configured to send an indication to a higher layer in a case that qualities of a prescribed number of links among the qualities of the plurality of links are worse than a threshold, and a higher layer processing unit configured to perform a recovery request to a base station apparatus in a case of receiving a prescribed number of the indications, and end the recovery request in a case of receiving a prescribed physical downlink control channel.
1. A terminal apparatus, comprising:
monitor circuitry configured to:
monitor qualities of one or more radio links, the one or more radio links being associated with one or more reference signals from a base station apparatus; and
monitor a physical downlink control channel (PDCCH) on the one or more radio links, wherein the PDCCH is configured to be decoded in accordance with the one or more reference signals;
physical layer processing circuitry configured to send an indication to higher layer processing circuitry in a case that the qualities of the one or more radio links are worse than a threshold associated with a block error rate; and
the higher layer processing circuitry configured to:
transmit a beam status report via a medium access control-control element (MAC-CE) to the base station apparatus in a case of receiving the indication a number of times and determining that a physical uplink control channel (PUSCH) is available, wherein the MAC-CE is transmitted on the PUSCH; and
transmit a beam recovery request for acquiring the PUSCH in a case of receiving the indication the number of times and determining that the PUSCH is not available.
2. The terminal apparatus according to claim 1 , wherein the one or more reference signals comprise one or more channel state information reference signals (CSI-RSs).
3. The terminal apparatus according to claim 1 , wherein the higher layer processing circuitry transmits the beam recovery request on an uplink resource associated with at least one of the one or more reference signals.
4. A communication method for a terminal apparatus comprising:
monitoring qualities of one or more radio links, the one or more radio links being associated with one or more reference signals from a base station apparatus;
monitoring a physical downlink control channel (PDCCH) on the one or more radio links, wherein the PDCCH is configured to be decoded in accordance with the one or more reference signals;
sending an indication to higher layer processing circuitry of the terminal apparatus in a case that the qualities of the one or more radio links are worse than a threshold associated with a block error rate;
transmitting a beam status report via a medium access control-control element (MAC-CE) to the base station apparatus in a case of receiving, by the higher layer processing circuitry, the indication a number of times and determining that a physical uplink control channel (PUSCH) is available, wherein the MAC-CE is transmitted on the PUSCH, and
transmitting a beam recovery request for acquiring the PUSCH in a case of receiving the indication the number of times and determining that the PUSCH is not available.
5. The communication method according to claim 4 , wherein the one or more reference signals comprise one or more channel state information reference signals (CSI-RSs).
6. The communication method according to claim 4 , wherein transmitting the beam recovery request includes transmitting the beam recovery request on an uplink resource associated with at least one of the one or more reference signals.
7. An integrated circuit mounted on a terminal apparatus, the integrated circuit causing the terminal apparatus to:
monitor qualities of one or more radio links, the one or more radio links being associated with one or more reference signals from a base station apparatus;
monitor a physical downlink control channel (PDCCH) on the one or more radio links, wherein the PDCCH is configured to be decoded in accordance with the one or more reference signals;
send an indication to higher layer processing circuitry of the integrated circuit in a case that the qualities of the one or more radio links are worse than a threshold associated with a block error rate; and
transmit a beam status report via a medium access control-control element (MAC-CE) to the in the base station apparatus in a case of receiving, by the higher layer processing circuitry, the indication a number of times and determining that a physical uplink control channel (PUSCH) is available, wherein the MAC-CE is transmitted on the PUSCH; and
transmit a beam recovery request for acquiring the PUSCH in a case of receiving the indication the number of times and determining that the PUSCH is not available.
8. The integrated circuit according to claim 7 , wherein the one or more reference signals comprise one or more channel state information reference signals (CSI-RSs).
9. The integrated circuit according to claim 7 , wherein the terminal apparatus transmits the beam recovery request on an uplink resource with at least one of the one or more reference signals.