Precoding matrix indicator determination in wireless communication systems
AssigneeAT&T Intellectual Property I, L.P.
InventorsSaiRamesh Nammi, Arunabha Ghosh
Life of this patent
Estimating the term…
Abstract
The described technology is generally directed towards reducing the complexity for finding the precoding matrix index/rank information channel state information in New Radio wireless systems. Described is using the beam characteristics of X1 (wideband component index) and X2 (subband component index) such that a user equipment first determines a best chosen X2 for only one X1 index. Thereafter, the user equipment uses the chosen index of X2 for the other X1 indices, thereby reducing the complexity of the precoding matrix index/rank information search by reducing the search space in the codebook, which reduces the number of computations at the user equipment side without significantly impacting the performance.
Claims20
A method, comprising:
- determining, by a user equipment comprising a processor, respective first link quality metric values for combinations of a starting wideband-based index of a group of wideband-based indices and subband-based indices of a group of subband-based indices;
- choosing, by the user equipment, a subband-based index from the group of subband based indices that has an associated first link quality metric value that satisfies a criterion, the choosing resulting in a chosen subband-based index;
- determining, by the user equipment, respective second link quality metric values for combinations of the chosen subband-based index and wideband-based indices of the group of wideband-based indices other than the starting wideband-based index;
- and
- choosing, by the user equipment, a precoding matrix indicator based on the respective second link quality metric values and the associated first link quality metric value for the combination of the chosen subband-based index and the starting wideband-based index.
A user equipment device, comprising:
- a processor;
- and
- a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, the operations comprising:
- determining respective first link quality metrics for combinations of a starting wideband-based index of a group of wideband-based indices and subband-based indices of a group of subband-based indices;
- selecting a subband-based index from the group of subband based indices that has an associated first link quality metric that satisfies a criterion, the selecting resulting in a selected subband-based index;
- determining respective second link quality metrics for combinations of the selected subband-based index and wideband-based indices of the group of wideband-based indices other than the starting wideband-based index;
- and
- selecting a precoding matrix indicator based on the respective second link quality metrics and the associated first link quality metric for the combination of the selected subband-based index and the starting wideband-based index.
A non-transitory machine-readable medium, comprising executable instructions that, when executed by a processor of a radio user equipment, facilitate performance of operations, the operations comprising:
- determining respective first metrics for combinations of a starting wideband-based index of a group of wideband-based indices and subband-based indices of a group of subband-based indices;
- choosing a subband-based index from the group of subband based indices that has an associated first metric that satisfies a criterion, the choosing resulting in a chosen subband-based index;
- determining respective second metrics for combinations of the chosen subband-based index and wideband-based indices of the group of wideband-based indices other than the starting wideband-based index;
- and
- choosing a precoding matrix indicator based on the respective second metrics and the associated first metric for the combination of the chosen subband-based index and the starting wideband-based index.
Dependencies are inferred from the claim text.