Terminal apparatus, base station apparatus, and communication method
A terminal apparatus transmits capability information. The capability information includes a first capability parameter, a second capability parameter, and a third capability parameter. The first capability parameter indicates whether the terminal apparatus supports Semi-Persistent Scheduling in a primary cell. The second capability parameter indicates whether the terminal apparatus supports skipping of uplink transmission corresponding to a grant configured for a primary cell in a case that there is no available data for transmission in a buffer of the terminal apparatus. The third capability parameter indicates whether the terminal apparatus supports Semi-Persistent Scheduling in an LAA secondary cell, and whether the terminal apparatus supports skipping of uplink transmission corresponding to a grant configured for an LAA secondary cell in a case that there is no available data for transmission in the buffer of the terminal apparatus.
1. A terminal apparatus comprising:
reception circuitry configured to receive a PDCCH (Physical Downlink Control Channel); and
MAC (Medium Access Control) layer processing circuitry configured to trigger a first confirmation in a case that downlink control information included in the PDCCH indicates release of unicast transmissions in a primary cell,
trigger a second confirmation in a case that the downlink control information included in the PDCCH indicates release of unicast transmissions in a LAA (Licensed Assisted Access) secondary cell,
at least based on that the first confirmation has been triggered and not cancelled, generate a first confirmation MAC CE (Control Element) corresponding to a first LCID (Logical Channel Identity) and cancel the first confirmation,
at least based on that the second confirmation has been triggered and not cancelled, generate a second confirmation MAC CE corresponding to a second LCID which is different from the first LCID and cancel the second confirmation, and
generate a MAC Protocol Data Unit including the first confirmation MAC CE and/or the second confirmation MAC CE, wherein
a size of the first confirmation MAC CE is 0 bits,
a size of the second MAC CE is larger than 0 bits, and
the first confirmation MAC CE is identified by a MAC subheader with the first LCID.
2. The terminal apparatus according to claim 1 , wherein
the second confirmation MAC CE includes Ci fields, and
each of the Ci fields corresponds to a LAA secondary cell with serving cell index ServCellIndex i.
3. A base station apparatus comprising:
transmission circuitry configured to transmit a PDCCH (Physical Downlink Control Channel), wherein
a first confirmation is triggered in a case that downlink control information included in the PDCCH indicates release of unicast transmissions in a primary cell,
a second confirmation is triggered in a case that the downlink control information included in the PDCCH indicates release of unicast transmissions in a LAA (Licensed Assisted Access) secondary cell,
at least based on that the first confirmation has been triggered and not cancelled, a first confirmation MAC CE (Control Element) corresponding to a first LCID (Logical Channel Identity) is generated and the first confirmation is canceled,
at least based on that the second confirmation has been triggered and not cancelled, a second confirmation MAC CE corresponding to a second LCID which is different from the first LCID is generated and the second confirmation is canceled, and
a MAC Protocol Data Unit including the first confirmation MAC CE and/or the second confirmation MAC CE is generated,
a size of the first confirmation MAC CE is 0 bits,
a size of the second MAC CE is larger than 0 bits, and
the first confirmation MAC CE is identified by a MAC subheader with the first LCID.
4. The base station apparatus according to claim 3 , wherein
the second confirmation MAC CE includes Ci fields, and
each of the Ci fields corresponds to a LAA secondary cell with serving cell index ServCellIndex I.
5. A communication method used in a terminal apparatus, the communication method comprising:
receiving a PDCCH (Physical Downlink Control Channel);
triggering a first confirmation in a case that downlink control information included in the PDCCH indicates release of unicast transmissions in a primary cell;
triggering a second confirmation in a case that the downlink control information included in the PDCCH indicates release of unicast transmissions in a LAA (Licensed Assisted Access) secondary cell;
at least based on that the first confirmation has been triggered and not cancelled, generating a first confirmation MAC CE (Control Element) corresponding to a first LCID (Logical Channel Identity) and canceling the first confirmation;
at least based on that the second confirmation has been triggered and not cancelled, generating a second confirmation MAC CE corresponding to a second LCID which is different from the first LCID and cancel the second confirmation; and
generating a MAC Protocol Data Unit including the first confirmation MAC CE and/or the second confirmation MAC CE, wherein
a size of the first confirmation MAC CE is 0 bits,
a size of the second MAC CE is larger than 0 bits, and
the first confirmation MAC CE is identified by a MAC subheader with the first LCID.
6. A communication method used in a base station apparatus, the communication method comprising:
transmitting a PDCCH (Physical Downlink Control Channel, wherein
a first confirmation is triggered in a case that downlink control information included in the PDCCH indicates release of unicast transmissions in a primary cell,
a second confirmation is triggered in a case that the downlink control information included in the PDCCH indicates release of unicast transmissions in a LAA (Licensed Assisted Access) secondary cell,
at least based on that the first confirmation has been triggered and not cancelled, a first confirmation MAC CE (Control Element) corresponding to a first LCID (Logical Channel Identity) is generated and the first confirmation is canceled,
at least based on that the second confirmation has been triggered and not cancelled, a second confirmation MAC CE corresponding to a second LCID which is different from the first LCID is generated and the second confirmation is canceled,
a MAC Protocol Data Unit including the first confirmation MAC CE and/or the second confirmation MAC CE is generated,
a size of the first confirmation MAC CE is 0 bits,
a size of the second MAC CE is larger than 0 bits, and
the first confirmation MAC CE is identified by a MAC subheader with the first LCID.