Precoder Resource Group Allocation for MIMO Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing precoder selection for multiple-input multiple-output (MIMO) communications, particularly in reducing downlink signaling and improving channel estimation accuracy across frequency-selective channels.
Innovation Solution
The proposed solution involves grouping time-frequency resources into precoder resource groups (PRGs) and allowing user equipment (UE) to select a common precoder for each group, independent of a predefined codebook, based on channel conditions and UE capabilities, thereby reducing the need for base station signaling and optimizing channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If codebook-based precoder selection is used, then the base station can control precoder selection, but downlink signaling overhead increases
Solution Approach 1:
The UE autonomously selects precoders from codebooks and determines PRG configurations without base station signaling. The UE uses its own channel measurements and capabilities to make precoder selection decisions, eliminating the need for downlink signaling of precoder indices while maintaining systematic control through predefined codebook structures.
2Measurement precision
If fine-grained precoder selection is used, then channel estimation accuracy improves, but device complexity increases
Solution Approach 1:
The frequency band is divided into multiple Precoder Resource Groups (PRGs), allowing the UE to select different precoders for different PRGs. This segmentation enables fine-grained channel estimation across frequency-selective channels while managing complexity by applying the same precoder within each PRG and using standardized codebook structures for precoder selection.
3Adaptability or versatility
If UE autonomously selects precoders, then flexibility in adapting to channel conditions improves, but coordination with base station becomes more difficult
Solution Approach 1:
The system configurable parameters such as the number of PRGs, PRG size, and codebook selection are adjusted based on channel conditions and UE capabilities. The UE autonomously adapts precoder selection to channel conditions by measuring channel quality and selecting appropriate precoders from codebooks, while the base station can reconfigure system parameters to balance autonomy with coordination requirements.
Data Source
AI summary
Aspects of the present disclosure disclose various methods for grouping network resources into precoder resource groups (PRGs) for precoding in MIMO communication. A user equipment (UE) may select a common precoder that may not be restricted to a codebook for precoding the resources in the same PRG. These resource grouping methods provide the UE with the flexibility to select a precoder that is well suited to the channel or bandwidth. Moreover, the base station may reduce downlink signaling because it does not need to signal the precoder choice to the UE. In some examples, the base station may receive PRG based channel state information feedback that facilitates DL precoding. Other aspects, embodiments, and features are also claimed and described.