System and method for channel state feedback in carrier aggregation
View Patent ↗A method for communicating channel state information (CSI) to a base station is presented. The method includes identifying a number of allocated resources for CSI within at least one of a Physical Uplink Control CHannel (PUCCH) payload and a Physical Uplink Shared CHannel (PUSCH) payload. The method includes encoding channel state information (CSI) for activated carriers on a user equipment into the allocated resources for CSI. When a number of activated carriers on the user equipment is less than the number of allocated resources for CSI, the method includes using repetition encoding to duplicate the CSI for at least one of the activated carriers on the user equipment into the allocated resources for CSI.
1. A method for communicating channel state information (CSI) to a base station, comprising:
identifying a number of allocated resources for CSI within at least one of a Physical Uplink Control CHannel (PUCCH) payload or a Physical Uplink Shared CHannel (PUSCH) payload;
encoding channel state information (CSI) for activated carriers on a user equipment into the allocated resources for CSI; and
when a number of activated carriers on the user equipment is less than the number of allocated resources for CSI, using repetition encoding in the PUCCH payload or the PUSCH payload to duplicate the CSI for at least one of the activated carriers on the user equipment.
2. The method of claim 1 , including encoding a bitmap into the at least one of a PUCCH payload or a PUSCH payload, the bitmap at least one of indicating whether the at least one of a PUCCH payload or a PUSCH payload includes repetition-encoded CSI and identifying the activated carriers on the user equipment.
3. The method of claim 1 , including:
receiving an indication from the base station identifying at least one of a PUCCH resource or a PUSCH resource for CSI; and
transmitting at least a portion of the encoded CSI using the identified at least one of a PUCCH resource or a PUSCH resource.
4. The method of claim 1 , including encoding Hybrid Automatic Repeat reQuest Acknowledgement/Negative-Acknowledgement (HARQ ACK/NACK) data into at least one of the allocated resources for CSI.
5. The method of claim 4 , including increasing a frequency of CSI reporting of the user equipment.
6. The method of claim 4 , wherein encoding HARQ ACK/NACK data comprises puncturing a CSI for at least one of the activated carriers on the user equipment.
7. A method for receiving channel state information (CSI) from a user equipment, comprising:
receiving at least one of a Physical Uplink Control CHannel (PUCCH) payload or a Physical Uplink Shared CHannel (PUSCH) payload from the user equipment, the at least one of a PUCCH payload or a PUSCH payload including a number of allocated resources for channel state information (CSI);
when the number of allocated resources for CSI include duplicated CSI in the PUCCH payload or the PUSCH payload, determining that the user equipment has activated a number of carriers less than the number of allocated resources for CSI.
8. A user equipment, comprising:
a processor, the processor being configured to:
identify a number of allocated resources for CSI within at least one of a Physical Uplink Control CHannel (PUCCH) payload or a Physical Uplink Shared CHannel (PUSCH) payload;
encode channel state information (CSI) for activated carriers on a user equipment into the allocated resources for CSI; and
when a number of activated carriers on the user equipment is less than the number of allocated resources for CSI, use repetition encoding in the PUCCH payload or the PUSCH payload to duplicate the CSI for at least one of the activated carriers on the user equipment into the allocated resources for CSI.
9. The user equipment of claim 8 , wherein the processor is configured to encode a bitmap into the at least one of a PUCCH payload or a PUSCH payload, the bitmap at least one of indicating whether the at least one of a PUCCH payload or a PUSCH payload includes repetition-encoded CSI and identifying the activated carriers on the user equipment.
10. The user equipment of claim 8 , wherein the processor is configured to:
receive an indication from a base station identifying at least one of a PUCCH resource or a PUSCH resource for CSI; and
transmit at least a portion of the encoded CSI using the identified at least one of a PUCCH resource or a PUSCH resource.
11. The user equipment of claim 8 , wherein the processor is configured to encode Hybrid Automatic Repeat reQuest Acknowledgement/Negative-Acknowledgement (HARQ ACK/NACK) data into at least one of the allocated resources for CSI.
12. The user equipment of claim 11 , wherein the processor is configured to increase a frequency of CSI reporting of the user equipment.