Codebook subset restriction for frequency-parameterized linear combination codebooks
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorSebastian Faxér
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Abstract
A wireless device, a network node and methods are disclosed. According to one aspect, a method includes receiving an indication of a maximum power level associated with a spatial-domain basis vector. The method includes determining whether a combination of values of the plurality of amplitude coefficients results in exceeding the maximum power level. The method further includes, responsive to determining that a combination of values of the plurality of amplitude coefficients results in exceeding the maximum power level, not reporting the combination of values in a channel state information, CSI, report.
Claims22
A method in a network node for codebook subset restriction, CBSR, of a Type II codebook, the method comprising:
- jointly restricting a maximum power level of amplitude coefficients of a spatial-domain basis vector of the codebook by restricting a square root of a sum of squares of the amplitude coefficients to be less than a maximum power threshold associated with a beam corresponding to the spatial-domain basis vector;
- and
- indicating the maximum power threshold to a wireless device, WD, to be used by the WD for determining whether the square root of the sum of the squares of the amplitude coefficients exceeds the maximum power threshold.
A network node for codebook subset restriction, CBSR, of a Type II codebook, the network node comprising:
- processing circuitry configured to jointly restrict a maximum power level of a amplitude coefficients of a spatial-domain basis vector of the codebook by restricting a square root of a sum of squares of the amplitude coefficients to be less than a maximum power threshold associated with a beam corresponding to the spatial-domain basis vector;
- and
- a radio interface in communication with the processing circuitry, the radio interface configured to indicate the maximum power threshold to a wireless device, WD, to be used by the WD for determining whether the square root of the sum of the squares of the amplitude coefficients exceeds the maximum power threshold.
A method in a wireless device, WD, for codebook subset restriction, CBSR, of a Type II codebook, the method comprising:
- receiving an indication of a maximum power threshold associated with a spatial-domain basis vector of the codebook;
- determining whether a square root of the sum of squares of amplitude coefficients of the spatial domain vector exceeds the maximum power threshold;
- and
- responsive to determining that the square root of the sum of squares of the amplitude coefficients exceeds the maximum power threshold not reporting the amplitude coefficients in a channel state information, CSI, report.
A wireless device, WD, for codebook subset restriction, CBSR, of a Type II codebook, the WD comprising:
- a radio interface configured to receive an indication of a maximum power threshold associated with a spatial-domain basis vector of the codebook;
- and
- processing circuitry in communication with the radio interface, the processing circuitry configured to:
- determine whether a square root of the sum of squares of amplitude coefficients of the spatial domain vector exceeds the maximum power threshold;
- and
- responsive to the determining that the square root of the sum of squares of the amplitude coefficients exceeds the maximum power level threshold not reporting the amplitude coefficients in a channel state information, CSI, report.
Dependencies are inferred from the claim text.