Subband Precoding Signaling for Wireless Networks
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Solution Overview
Problem
Conventional wideband precoding in wireless communication systems lacks flexibility and beamforming gains, as it uses a single precoder for all subbands, which can lead to suboptimal performance due to varying channel conditions and interference levels across different subbands.
Innovation Solution
Implementing a combination of wideband and subband precoding, where a base station transmits a default precoder for multiple subbands and overrides it with specific precoders for subsets, allowing for flexible configuration based on channel conditions and interference patterns, and removing ambiguity in DCI size by using a fixed number of bits for subband precoding configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional wideband precoding is used with a single common precoder for all subbands, then device complexity is reduced and ease of operation is improved, but beamforming gains are insufficient and communication efficiency deteriorates due to inability to adapt to varying channel conditions across subbands
Solution Approach 1:
The patent divides the frequency band into multiple subbands and applies different precoding strategies to each subband. Specifically, a first precoder is applied across the entire bandwidth, while a second precoder is applied selectively to certain subbands based on channel conditions, interference levels, and resource allocation. This segmentation allows the system to maintain simplicity where appropriate while enhancing performance where needed.
Solution Approach 2:
The patent introduces dynamic precoder selection where the second precoder is applied to specific subbands based on varying channel conditions, interference patterns, and resource allocation requirements. The system dynamically determines which subbands benefit from enhanced precoding, allowing adaptation to changing environmental conditions while maintaining operational flexibility.
2Productivity
If subband precoding with multiple precoders is implemented to improve beamforming gains and adapt to varying channel conditions, then communication efficiency is improved, but device complexity increases due to multiple precoder management and configuration
Solution Approach 1:
The patent merges wideband precoding and subband precoding into a unified framework. The first precoder operates across the entire bandwidth providing baseline beamforming, while the second precoder supplements it in specific subbands. This combining approach allows the system to achieve the benefits of both wideband and subband precoding while managing complexity through structured integration rather than separate independent systems.
Solution Approach 2:
The patent applies enhanced precoding quality selectively to specific subbands where channel conditions, interference patterns, or resource allocation indicate a need for improved performance. Rather than uniformly applying complex multi-precoder processing across all subbands, the system concentrates additional precoding resources where they provide the most benefit, thereby improving communication efficiency while limiting the increase in device complexity.
3Adaptability or versatility
If subband precoding configuration with variable bit allocation is used to optimize precoder selection, then adaptability to different channel conditions is improved, but ambiguity in DCI size increases and decoding complexity for user equipment deteriorates
Solution Approach 1:
The patent modifies the DCI format to include a fixed number of bits for indicating the second precoder, eliminating size ambiguity. By standardizing the bit allocation for subband precoder indication, the system maintains adaptability in precoder selection while ensuring that user equipment can decode the DCI with a predetermined, unambiguous size, thereby reducing decoding complexity.
4Ease of operation
If a fixed number of bits is used for subband precoding configuration to remove DCI size ambiguity, then ease of operation is improved and decoding complexity is reduced, but flexibility in precoder configuration is reduced
Solution Approach 1:
The patent uses a fixed bit allocation for the second precoder indication that is sufficient to cover the essential precoding needs across different subbands. While the bit width is fixed, the system achieves adequate flexibility by selectively applying the second precoder to specific subbands based on channel conditions and resource allocation, rather than requiring variable-length encodings for all possible configurations.
Data Source
AI summary
Wireless communications systems and methods related to wireless communications in a system are provided. A user equipment (UE) may receive from a base station (BS), a subband precoding configuration including a first number of bits and an indication of a common size for each subband of a set of subbands. The UE may select a plurality of precoders from a precoder candidate set based on the first number and the common size. The precoder candidate set may be based on an order of a spatial direction. Additionally, the UE may transmit to the BS, a communication signal in the plurality of subbands using the plurality of precoders.