Power control for simultaneous transmission of ACK/NACK and channel-state information in carrier aggregation systems
Channel-state information and hybrid-ARQ ACK/NACK information for multiple carriers are simultaneously transmitted using a PUCCH Format 3 structure, where the hybrid-ARQ ACK/NACK bits and CSI bits are separately encoded and interleaved. In an example method, a power control offset parameter is calculated ( 2110 ) as a linear combination of at least a number N, representing a number of channel-state information bits and a number M, representing a number of hybrid-ARQ ACK/NACK bits. The method continues with the calculating ( 2120 ) of a power level for a transmission on a physical uplink control channel (PUCCH), using the power control offset parameter. In some embodiments, encoded channel-state information and hybrid-ARQ ACK/NACK bits are then transmitted ( 2060 ) according to the calculated power level. In some embodiments, the linear combination is of the form aN+bM+c, where a, b, and c are non-zero constants.
1. A method in a mobile terminal configured for simultaneous reporting of channel-state information bits and hybrid-ARQ ACK/NACK bits for multiple downlink subframes or multiple downlink carriers, or both, the method comprising, for each of a first plurality of reporting instances:
calculating a power control offset parameter as a linear combination of at least a number N, representing a number of channel-state information bits, and a number M, representing a number of hybrid-ARQ ACK/NACK bits; and
calculating a power level for a transmission on a physical uplink control channel (PUCCH), using the power control offset parameter; and
transmitting encoded channel-state information and hybrid-ARQ ACK/NACK bits according to the calculated power level.
2. The method of claim 1 , wherein said linear combination is of the form aN+bM+c, where a, b, and c are non-zero constants.
3. The method of claim 1 , further comprising calculating a power headroom parameter based on the calculated power level and based on a calculated power level for shared channel transmission.
4. The method of claim 3 , further comprising transmitting the power headroom parameter to a base station.
5. The method of claim 1 , wherein the number M represents the number of hybrid-ARQ ACK/NACK bits and a scheduling request (SR) bit.
6. A mobile terminal configured to simultaneously report channel-state information bits and hybrid-ARQ ACK/NACK bits for multiple downlink subframes or multiple downlink carriers, or both, the mobile terminal comprising a receiver circuit, a transmitter circuit, and a processing circuit, wherein the processing circuit is adapted to, for each of a first plurality of reporting instances:
calculate a power control offset parameter as a linear combination of at least a number N,
representing a number of channel-state information bits, and a number M,
representing a number of hybrid-ARQ ACK/NACK bits; and
calculate a power level for a transmission on a physical uplink control channel (PUCCH), using the power control offset parameter; and
control the transmitter circuit to transmit the encoded channel-state information and hybrid-ARQ ACK/NACK bits according to the calculated power level.
7. The mobile terminal of claim 6 , wherein said linear combination is of the form aN+bM+c, where a, b, and c are non-zero constants.
8. The mobile terminal of claim 6 , wherein the processing circuit is further adapted to calculate a power headroom parameter based on the calculated power level
and based on a calculated power level for shared channel transmission.
9. The mobile terminal of claim 8 , wherein the processing circuit is further adapted to, for each of the plurality of reporting instances, control the transmitter circuit to transmit the power headroom parameter to a base station.
10. The mobile terminal of claim 6 , wherein the number M represents the number of hybrid-ARQ ACK/NACK bits and a scheduling request (SR) bit.