Channel state information transmission for multiple carriers
Channel state information is reported in periodic and aperiodic reports for multiple component carriers or serving cells. Channel state information may be reported for a subset of aggregated downlink carriers or serving cells. For an aperiodic report, the carrier(s)/serving cell(s) for which channel state information is reported may be determined based on the request for the aperiodic report. A report collision may occur in a subframe between a periodic CSI report for a first serving cell and a report for a second serving cell. A priority rule may be used to resolve the report collision.
1. A wireless transmit/receive unit (WTRU) for reporting periodic channel state information (CSI), the WTRU comprising:
a processor configured to:
determine that there is a report collision in a subframe between a first periodic CSI report for a first serving cell and a second periodic CSI report for a second serving cell, wherein the first periodic CSI report for the first serving cell corresponds to a first physical uplink control channel (PUCCH) reporting type and the second periodic CSI report for the second serving cell corresponds to a second PUCCH reporting type;
determine that the first periodic CSI report for the first serving cell is prioritized over the second periodic CSI report for the second serving cell based on the first PUCCH reporting type being higher priority than the second PUCCH reporting type; and
send the first periodic CSI report for the first serving cell via a PUCCH.
2. The WTRU of claim 1 , wherein the processor is further configured to determine that the WTRU is not configured for simultaneous physical uplink shared channel (PUSCH) and PUCCH transmission.
3. The WTRU of claim 1 , wherein the processor is further configured to determine a periodic CSI report configuration for the first serving cell.
4. The WTRU of claim 3 , wherein the periodic CSI report configuration comprises a reporting period and a report type offset.
5. The WTRU of claim 3 , wherein the processor is further configured to determine that the first periodic CSI report for the first serving cell is prioritized over the second periodic CSI report for the second serving cell based on the first PUCCH reporting type being higher priority than the second PUCCH reporting type, and the periodic CSI report configuration.
6. The WTRU of claim 1 , wherein the first serving cell is in an active state and the second serving cell is in a deactivated state, and wherein the processor is further configured to determine that the first periodic CSI report for the first serving cell is prioritized over the second periodic CSI report for the second serving cell based on the first PUCCH reporting type being higher priority than the second PUCCH reporting type such that the report for second serving cell is prevented from being reported while the second serving cell is in the deactivated state.
7. A method for reporting periodic channel state information (CSI) comprising:
determining, via a wireless transmit/receive unit (WTRU), that there is a report collision in a subframe between a first periodic CSI report for a first serving cell and a second periodic CSI report for a second serving cell, wherein the first periodic CSI report for the first serving cell corresponds to a first physical uplink control channel (PUCCH) reporting type and the second periodic CSI report for the second serving cell corresponds to a second PUCCH reporting type;
determining that the first periodic CSI report for the first serving cell is prioritized over the second periodic CSI report for the second serving cell based on the first PUCCH reporting type being higher priority for the second PUCCH reporting type; and
sending first the periodic CSI report for the first serving cell via a PUCCH.
8. The method of claim 7 , further comprising determining the WTRU is not configured for simultaneous physical uplink shared channel (PUSCH) and PUCCH transmission.
9. The method of claim 7 , further comprising
determining a periodic CSI report configuration for the first serving cell.
10. The method of claim 9 , wherein the periodic CSI report configuration comprises a reporting period and a report type offset.
11. The method of claim 9 , wherein determining that the first periodic CSI report for the first serving cell is prioritized over the second periodic CSI report for the second serving cell based on the first PUCCH reporting type being higher priority than the second PUCCH reporting type, and the periodic CSI report configuration.
12. The method of claim 7 , wherein the first serving cell is in an active state and the second serving cell is in a deactivated state, and wherein the processor is further configured to determine that the first periodic CSI report for the first serving cell is prioritized over the second periodic CSI report for the second serving cell based on the first PUCCH reporting type being higher priority than the second PUCCH reporting type such that the report for the second serving cell is prevented from being reported while the second serving cell is in the deactivated state.