System and method for pucch subband feedback signaling in a wireless network

A method for use in a mobile station operable to transmit feedback reports to a base station of a wireless network, the method including:

• transmitting to the base station a first feedback report including a precoder type indication (PTI) value;
• transmitting to the base station a second feedback report;
• and
• transmitting to the base station a third feedback report,
• wherein the PTI value indicates at least one of a period of the second feedback report and a period of the third feedback report.

A method for use in a base station of a wireless network operable to receive feedback reports transmitted by a mobile station, the method comprising:

• receiving a first feedback report;
• identifying in the first feedback report a precoder type indication (PTI) value;
• determining from the PTI value at least one of a period of a second feedback report and a period of a third feedback report;
• receiving the second feedback report;
• and
• receiving the third feedback report.

For use in a wireless network, a mobile station operable to communicate with a base station that transmits using a precoder specified by a codebook, wherein the mobile station performs rank-dependent codebook subset selection for subband W2 feedback such that:

• when a rank report from the mobile station to the base station belongs to a first set, the mobile station transmits a subband precoding matrix indicator W2 using a codebook that is the same for a first precoder type indication (PTI) value and a second PTI value;
• when the rank report from the mobile station to the base station belongs to a second set, the mobile station transmits a subband precoding matrix indicator W2 using a first W2 codebook when the mobile station transmits a first PTI value and transmits a subband precoding matrix indicator W2 using a second W2 codebook when the mobile station transmits a second PTI value, wherein the second W2 codebook is a subset of the first W2 codebook;
• and
• when the rank report from the mobile station to the base station belongs to a third set, the mobile station does not transmit the second PMI when the mobile station transmits a second PTI value.

For use in a mobile station operable to communicate with a base station that transmits using a precoder specified by a codebook, a method of performing rank-dependent codebook subset selection for subband W2 feedback comprising:

• when a rank report from the mobile station to the base station belongs to a first set, transmitting from the mobile station a subband precoding matrix indicator W2 using a codebook that is the same for a first precoder type indication (PTI) value and a second PTI value;
• when the rank report from the mobile station to the base station belongs to a second set,
• transmitting from the mobile station a subband precoding matrix indicator W2 using a first W2 codebook when the mobile station transmits a first PTI value and
• transmitting a subband precoding matrix indicator W2 using a second W2 codebook when the mobile station transmits a second PTI value, wherein the second W2 codebook is a subset of the first W2 codebook;
• and
• when the rank report from the mobile station to the base station belongs to a third set, transmitting the second PTI value from the mobile station without transmitting the second PMI.

For use in a wireless network operable to communicate with a plurality of mobile stations, a base station that transmits using a precoder specified by a codebook such that:

• when the base station receives from the first mobile station a rank report that belongs to a first set, the base station identifies a subband precoding matrix indicator W2 received from the first mobile station using a codebook that is the same for a first precoder type indication (PTI) value and a second PTI value;
• when the base station receives from the mobile station a rank report that belongs to a second set, the base station identifies a subband precoding matrix indicator W2 received from the first mobile station using a first W2 codebook when the mobile station transmits a first PTI value and identifies a subband precoding matrix indicator W2 received from the first mobile station using a second W2 codebook when the mobile station transmits a second PTI value, wherein the second W2 codebook is a subset of the first W2 codebook;
• and
• when the base station receives from the mobile station a rank report that belongs to a third set, the base station does not receive a second PMI when the mobile station transmits a second PTI value.

For use in a base station operable to communicate with a mobile station, a method of transmitting using a precoder specified by a codebook comprising:

• in response to receiving from the mobile station a rank report that belongs to a first set, identifying a subband precoding matrix indicator W2 received from the first mobile station using a codebook that is the same for a first precoder type indication (PTI) value and a second PTI value;
• in response to receiving from the mobile station a rank report that belongs to a second set,
• identifying a subband precoding matrix indicator W2 received from the first mobile station using a first W2 codebook when the mobile station transmits a first PTI value;
• and
• identifying a subband precoding matrix indicator W2 received from the first mobile station using a second W2 codebook when the mobile station transmits a second PTI value, wherein the second W2 codebook is a subset of the first W2 codebook;
• and
• in response to receiving from the mobile station a rank report that belongs to a third set, receiving a second PTI value from the mobile station without a second PMI.