Systems and methods for PUCCH feedback in 3GPP wireless networks

Abstract

A mobile station for use in a wireless network. The mobile station transmits feedback values in a physical uplink control channel (PUCCH) to a base station of the wireless network. The mobile station is operable to transmit to the base station a subband second precoder matrix index (PMI) associated with a particular subband and a subband channel quality indicator (CQI) value associated with the particular subband together in a subframe of the PUCCH.

What is claimed is: 
     
       1. For use in a wireless network, a mobile station comprising:
 at least one antenna; and  
 a transmitting unit coupled to the at least one antenna and configured to transmit, via the at least one antenna, feedback values in a physical uplink control channel (PUCCH) to a base station of the wireless network; 
 wherein the mobile station is configured to transmit to the base station a subband precoder matrix index (PMI) associated with a particular subband and a subband channel quality indicator (CQI) value associated with the particular subband together in a first subframe of the PUCCH; 
 wherein the particular subband comprises one of multiple subbands that are divided into multiple subsets, the subset to which the particular subband belongs identified by a subset indicator; and 
 wherein the mobile station is configured to selectively transmit a wideband PMI to the base station in the first subframe, in a second subframe, or not at all depending on the subset indicator and content of the wideband PMI. 
 
     
     
       2. The mobile station as set forth in  claim 1 , wherein the mobile station is further configured to transmit to the base station a wideband CQI value in the PUCCH. 
     
     
       3. The mobile station as set forth in  claim 2 , wherein a period at which the mobile station transmits the wideband PMI and the wideband CQI value is a multiple of a period at which the mobile station transmits the subband PMI and the subband CQI value. 
     
     
       4. The mobile station of  claim 1 , wherein:
 the mobile station is configured to transmit the wideband PMI in the first subframe when the subset indicator has a first value; and 
 the mobile station is configured to transmit the wideband PMI in the second subframe when the subset indicator has a second value. 
 
     
     
       5. The mobile station of  claim 1 , wherein the mobile station is configured to not transmit the wideband PMI to the base station when then wideband PMI is an identity matrix and the subset indicator has a specified value. 
     
     
       6. A method of operating a mobile station, the method comprising:
 transmitting to a base station a subband precoder matrix index (PMI) associated with a particular subband and a subband channel quality indicator (CQI) value associated with the particular subband together in a first subframe of a physical uplink control channel (PUCCH); and 
 selectively transmitting a wideband PMI to the base station in the first subframe, in a second subframe, or not at all depending on a subset indicator and content of the wideband PMI; 
 wherein the particular subband comprises one of multiple subbands that are divided into multiple subsets, the subset to which the particular subband belongs identified by the subset indicator. 
 
     
     
       7. The method as set forth in  claim 6 , further comprising:
 transmitting to the base station a wideband CQI value in the PUCCH. 
 
     
     
       8. The method as set forth in  claim 7 , wherein a period at which the mobile station transmits the wideband PMI and the wideband CQI value is a multiple of a period at which the mobile station transmits the subband PMI and the subband CQI value. 
     
     
       9. The method of  claim 6 , wherein selectively transmitting the wideband PMI to the base station comprises:
 transmitting the wideband PMI to the base station in the first subframe when the subset indicator has a first value; and 
 transmitting the wideband PMI to the base station in the second subframe when the subset indicator has a second value. 
 
     
     
       10. The method of  claim 6 , wherein selectively transmitting the wideband PMI to the base station comprises:
 not transmitting the wideband PMI to the base station when then wideband PMI is an identity matrix and the subset indicator has a specified value. 
 
     
     
       11. For use in a wireless network, a base station comprising:
 at least one antenna; and  
 a receiving unit coupled to the at least one antenna and configured to receive from a mobile station, via the at least one antenna, feedback values transmitted in a physical uplink control channel (PUCCH); 
 wherein the base station is configured to receive a subband precoder matrix index (PMI) associated with a particular subband and a subband channel quality indicator (CQI) value associated with the particular subband together in a first subframe of the PUCCH; 
 wherein the particular subband comprises one of multiple subbands that are divided into multiple subsets, the subset to which the particular subband belongs identified by a subset indicator; and 
 wherein the base station is configured to selectively receive a wideband PMI from the mobile station in the first subframe, in a second subframe, or not at all depending on the subset indicator and content of the wideband PMI. 
 
     
     
       12. The base station as set forth in  claim 11 , wherein the base station is further operable to receive from the mobile station a wideband CQI value in the PUCCH. 
     
     
       13. The base station as set forth in  claim 12 , wherein a period at which the base station receives the wideband PMI and the wideband CQI value is a multiple of a period at which the base station receives the subband PMI and the subband CQI value. 
     
     
       14. The base station of  claim 11 , wherein:
 the base station is configured to receive the wideband PMI in the first subframe when the subset indicator has a first value; and 
 the base station is configured to receive the wideband PMI in the second subframe when the subset indicator has a second value. 
 
     
     
       15. The base station of  claim 11 , wherein the base station is configured to not receive the wideband PMI from the mobile station when then wideband PMI is an identity matrix and the subset indicator has a specified value. 
     
     
       16. A method of operating a base station, the method comprising:
 receiving from a mobile station a subband precoder matrix index (PMI) associated with a particular subband and a subband channel quality indicator (CQI) value associated with the particular subband together in a first subframe of a physical uplink control channel (PUCCH); and 
 selectively receiving a wideband PMI from the mobile station in the first subframe, in a second subframe, or not at all depending on a subset indicator and content of the wideband PMI; 
 wherein the particular subband comprises one of multiple subbands that are divided into multiple subsets, the subset to which the particular subband belongs identified by the subset indicator. 
 
     
     
       17. The method as set forth in  claim 16 , further comprising:
 receiving from the mobile station a wideband CQI value in the PUCCH. 
 
     
     
       18. The method as set forth in  claim 17 , wherein a period at which the base station receives the wideband PMI and the wideband CQI value is a multiple of a period at which the base station receives the subband PMI and the subband CQI value. 
     
     
       19. The method of  claim 16 , wherein selectively receiving the wideband PMI from the mobile station comprises:
 receiving the wideband PMI from the mobile station in the first subframe when the subset indicator has a first value; and 
 receiving the wideband PMI from the mobile station in the second subframe when the subset indicator has a second value. 
 
     
     
       20. The method of  claim 16 , wherein selectively receiving the wideband PMI from the mobile station comprises:
 not receiving the wideband PMI from the mobile station when then wideband PMI is an identity matrix and the subset indicator has a specified value. 
 
     
     
       21. A system, comprising:
 a mobile station configured to determine feedback values; and   a transmitting unit within the mobile station, the mobile station configured to transmit the feedback values to a base station, wherein the feedback values include,
 in a first subframe, a channel quality indicator (CQI) for a subset of two or more subbands and a precoder matrix indicator (PMI) selected from a codebook subset for transmission over the subset of subbands, and 
 in a second subframe, a value indicating a subband of the subset of subbands and CQI for the indicated subband. 
   
     
     
       22. The mobile station as set forth in claim 21, wherein the mobile station is further configured to transmit the value indicating the subband of the subset of subbands to the base station in a physical uplink control channel (PUCCH). 
     
     
       23. The mobile station as set forth in claim 22, wherein a period at which the mobile station transmits the CQI for the subset of subbands and the PMI is a multiple of a period at which the mobile station transmits the value indicating the subband of the subset of subbands. 
     
     
       24. A method of operating a mobile station, the method comprising:
 transmitting, from the mobile station to a base station in a first subframe, a channel quality indicator (CQI) for a subset of subbands and a precoder matrix indicator (PMI) selected from a codebook subset for transmission over the selected subset of subbands; and   transmitting, from the mobile station to the base station in a second subframe, a value indicating a subband of the subset of subbands and CQI for the indicated subband.   
     
     
       25. The method as set forth in claim 24, further comprising:
 transmitting the value indicating the subband of the subset of subbands to the base station in a physical uplink control channel (PUCCH).   
     
     
       26. The method as set forth in claim 25, wherein a period at which the mobile station transmits the CQI for the subset of subbands and the PMI is a multiple of a period at which the mobile station transmits the value indicating the subband of the subset of subbands. 
     
     
       27. A system, comprising:
 a base station configured to process received signals; and   a receiving unit within the base station, the receiving unit configured to receive feedback values from a mobile station, wherein the feedback values include,
 in a first subframe, a channel quality indicator (CQI) for a subset of two or more subbands and a precoder matrix indicator (PMI) selected from a codebook subset for transmission over the subset of subbands, and 
 in a second subframe, a value indicating a subband of the subset of subbands and CQI for the indicated subband. 
   
     
     
       28. The system as set forth in claim 27, wherein the base station is further configured to receive the value indicating the subband of the subset of subbands from the mobile station in a physical uplink control channel (PUCCH). 
     
     
       29. The system as set forth in claim 27, wherein a period at which the base station receives the CQI for the subset of subbands and the PMI is a multiple of a period at which the mobile station transmits the value indicating the subband of the subset of subbands. 
     
     
       30. A method of operating a base station, the method comprising:
 receiving, from a mobile station at the base station in a first subframe, a channel quality indicator (CQI) for a subset of two or more subbands and a precoder matrix indicator (PMI) selected from a codebook subset for transmission over the subset of subbands; and   receiving, from the mobile station at the base station in a second subframe, a value indicating a subband of the subset of subbands and CQI for the indicted subband.   
     
     
       31. The method as set forth in claim 30, further comprising:
 receiving the value indicating the subband of the subset of subbands at the base station in a physical uplink control channel (PUCCH).   
     
     
       32. The method as set forth in claim 31, wherein a period at which the base station receives the CQI for the subset of subbands and the PMI is a multiple of a period at which the mobile station transmits the value indicating the subband of the subset of subbands.