CSI Feedback Compression With Beam Groups and Transform Bases
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Solution Overview
Problem
The increasing demand for mobile broadband access in wireless communication systems, particularly in LTE and NR technologies, necessitates improvements in channel state information feedback to reduce overhead and optimize resource utilization.
Innovation Solution
Implementing channel state information feedback compression techniques by grouping beams into transform domain bases and transmitting reduced-bit representations of beam group identification and transform domain basis selection information, thereby reducing uplink radio resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel state information feedback is transmitted with full detail, then measurement precision is improved, but uplink radio resource consumption increases
Solution Approach 1:
The patent extracts only the essential information needed for channel state feedback by grouping beams into transform domain bases and transmitting reduced-bit representations. Instead of sending complete channel state data, the system extracts and transmits only the beam group identification and transform domain basis selection information, significantly reducing uplink radio resource consumption while maintaining sufficient measurement precision for effective channel characterization.
Solution Approach 2:
The patent changes the representation parameters of channel state information by transforming detailed channel data into a compressed format based on beam groups and transform domain bases. This parameter transformation reduces the bit width from full precision channel state feedback to reduced-bit representations, achieving efficient use of uplink radio resources while preserving the essential channel state characteristics needed for communication optimization.
2Quantity of substance
If channel state information feedback is compressed, then uplink radio resource consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the channel state feedback process into distinct manageable components: beam grouping, transform domain basis selection, and reduced-bit representation generation. By dividing the complex feedback compression task into these segmented operations, the system reduces the computational burden on individual processing units while achieving effective compression of uplink radio resources.
Solution Approach 2:
The patent introduces transform domain bases as an intermediary representation between the detailed channel state information and the compressed feedback. This intermediary layer simplifies the processing complexity by providing a standardized basis for beam group representation, making the compression process more manageable and efficient while reducing the direct complexity of transforming raw channel data into compact feedback.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may identify, based at least in part on a codebook, a set of beams to feedback in a channel state information (CSI) feedback communication, and may identify one or more beam groups associated with the set of beams. The UE may select respective one or more transfer domain bases, from a plurality of transfer domain bases, for each beam group of the one or more beam groups, and may determine a plurality of values, for a plurality of bits, that represent beam group identification information associated with the one or more beam groups and transfer domain basis selection information associated with the respective one or more transfer domain bases. The UE may transmit, to a base station (BS), the plurality of bits in the CSI feedback communication. Numerous other aspects are provided.