Reporting channel state information in a multiple component carrier network

1. A method of operating a user equipment (UE), the method comprising:

determining whether at least two of a plurality of channel state information (CSI) reports are to be transmitted on a physical uplink control channel (PUCCH) in a subframe, each of the plurality of CSI reports related to a respective one of a plurality of component carriers;

on a condition that the determination is positive, dropping at least one lower priority CSI report of the plurality of CSI reports, wherein:

a CSI report containing a Rank Indicator (RI) is prioritized over one or more CSI reports containing a Channel Quality Indicator (CQI), and

a CSI report containing a RI for a primary component carrier is prioritized over one or more CSI reports containing a RI for a respective secondary component carrier; and

transmitting, subsequent to the dropping, at least one prioritized CSI report of the plurality of CSI reports on the PUCCH in the subframe.

2. The method of claim 1 , wherein each of the plurality of component carriers has an associated priority, the method further comprising:

on a condition that there are no CSI reports for a primary component carrier, dropping at least one lower priority CSI report of the plurality of CSI reports, wherein a CSI report containing a RI for a component carrier with a highest associated priority is prioritized over one or more CSI reports containing a RI for a respective component carrier of lower associated priority.

3. A user equipment (UE) comprising:

a processor operable to determine whether at least two of a plurality of channel state information (CSI) reports are to be transmitted on a physical uplink control channel (PUCCH) in a subframe, each of the plurality of CSI reports related to a respective one of a plurality of component carriers;

the processor further operable to, on a condition that the determination is positive, drop at least one lower priority CSI report of the plurality of CSI reports, wherein a CSI report containing a Rank Indicator (RI) is prioritized over one or more CSI reports containing a Channel Quality Indicator (CQI), and wherein a CSI report containing a RI for a primary component carrier is prioritized over one or more CSI reports containing a RI for a respective secondary component carrier; and

a transmitter operable to transmit at least one prioritized CSI report of the plurality of CSI reports on the PUCCH in the subframe.

4. The UE of claim 3 , wherein each of the plurality of component carriers has an associated priority, and the processor further operable to, on a condition there are no CSI reports for a primary component carrier, dropping at least one lower priority CSI report of the plurality of CSI reports, wherein a CSI report containing a RI for a component carrier with a highest associated priority is prioritized over one or more CSI reports containing a RI for a respective component carrier of lower associated priority.

5. A non-transitory computer readable storage medium comprising executable code stored thereon that, when executed by a processor, causes a user equipment (UE) to:

determine whether at least two of a plurality of channel state information (CSI) reports are to be transmitted on a physical uplink control channel (PUCCH) in a subframe, each of the plurality of CSI reports related to a respective one of a plurality of component carriers;

on a condition that the determination is positive, drop at least one lower priority CSI report of the plurality of CSI reports, wherein:

a CSI report containing a Rank Indicator (RI) is prioritized over one or more CSI reports containing a Channel Quality Indicator (CQI), and

a CSI report containing a RI for a primary component carrier is prioritized over one or more CSI reports containing a RI for a respective secondary component carrier; and

transmit, subsequent to the dropping, at least one prioritized CSI report of the plurality of CSI reports on the PUCCH in the subframe.

6. The non-transitory computer readable storage medium of claim 5 , wherein each of the plurality of component carriers has an associated priority, and the executable code, when executed by the processor, further causes the UE to, on a condition there are no CSI reports for a primary component carrier, drop at least one lower priority CSI report of the plurality of CSI reports, wherein a CSI report containing a RI for a component carrier with a highest associated priority is prioritized over one or more CSI reports containing a RI for a respective component carrier of lower associated priority.

7. A method of operating a user equipment (UE), the method comprising:

determining whether at least two of a plurality of channel state information (CSI) reports are to be transmitted on a physical uplink control channel (PUCCH) in a subframe, each of the plurality of CSI reports related to a respective one of a plurality of component carriers and each of the plurality of component carriers having an associated priority;

on a condition that the determination is positive, dropping at least one lower priority CSI report of the plurality of CSI reports, wherein:

a CSI report containing a Rank Indicator (RI) is prioritized over one or more CSI reports containing a Channel Quality Indicator (CQI), and

a CSI report containing a RI for a component carrier with a highest associated priority is prioritized over one or more CSI reports containing a RI for a respective component carrier of lower associated priority; and

transmitting, subsequent to the dropping, at least one prioritized CSI report of the plurality of CSI reports on the PUCCH in the subframe.

8. A user equipment (UE) comprising:

a processor operable to determine whether at least two of a plurality of channel state information (CSI) reports are to be transmitted on a physical uplink control channel (PUCCH) in a subframe, each of the plurality of CSI reports related to a respective one of a plurality of component carriers and each of the plurality of component carriers having an associated priority;

the processor further operable to, on a condition that the determination is positive, drop at least one lower priority CSI report of the plurality of CSI reports, wherein:

a CSI report containing a Rank Indicator (RI) is prioritized over one or more CSI reports containing a Channel Quality Indicator (CQI), and

a CSI report containing a RI for a component carrier with a highest associated priority is prioritized over one or more CSI reports containing a RI for a respective component carrier of a lower associated priority; and

a transmitter operable to transmit at least one prioritized CSI report of the plurality of CSI reports on the PUCCH in the subframe.

9. A non-transitory computer readable storage medium comprising executable code stored thereon that, when executed by a processor, causes a user equipment (UE) to:

determine whether at least two of a plurality of channel state information (CSI) reports are to be transmitted on a physical uplink control channel (PUCCH) in a subframe, each of the plurality of CSI reports related to a respective one of a plurality of component carriers and each of the plurality of component carriers having an associated priority;

on a condition that the determination is positive, drop at least one lower priority CSI report of the plurality of CSI reports, wherein:

a CSI report containing a Rank Indicator (RI) is prioritized over one or more CSI reports containing a Channel Quality Indicator (CQI), and

a CSI report containing a RI for a component carrier with a highest associated priority is prioritized over one or more CSI reports containing a RI for a respective component carrier of lower associated priority; and

transmit, subsequent to the dropping, at least one prioritized CSI report of the plurality of CSI reports on the PUCCH in the subframe.