REG Bundle Cyclic Shift for PRG Edge Channel Estimation
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Solution Overview
Problem
In wireless communications systems, channel estimation performance is compromised due to poor channel estimation quality at the edge tones of physical resource groups (PRGs) when demodulation reference signals (DMRS) are shared across multiple control channels, leading to inconsistent channel estimation quality for user equipment (UEs).
Innovation Solution
Implementing cyclic shifts for resource element group (REG) bundles across physical resource groups (PRGs) such that the quantity of bundles per PRG is coprime to the interleaver width, ensuring REG bundles cycle through different PRGs, thereby improving channel estimation quality by avoiding repeated mapping to edge resource blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If demodulation reference signals (DMRS) are shared across multiple control channels in a control resource set, then resource utilization efficiency is improved, but channel estimation quality at edge tones of physical resource groups (PRGs) deteriorates
Solution Approach 1:
The patent applies local quality by making the REG bundle mapping pattern different from the PRG structure. Specifically, the quantity of REG bundles per PRG is configured to be different from the interleaver width, creating local variations in mapping patterns that prevent consistent edge tone mapping while maintaining overall resource sharing efficiency across the control resource set.
Solution Approach 2:
The patent changes the parameter relationship between REG bundle quantity per PRG and interleaver width. By configuring these two parameters to have different values (breaking the traditional equality constraint), the system achieves both DMRS sharing efficiency and improved channel estimation quality through varied mapping patterns across different PRGs.
2Ease of manufacture
If REG bundles are mapped to edge resource blocks of PRGs, then resource allocation simplicity is improved, but decoding accuracy of control channels deteriorates
Solution Approach 1:
The patent implements local quality by creating non-uniform REG bundle distribution across PRGs. The mapping pattern varies locally within different PRGs due to the mismatch between REG bundle quantity per PRG and interleaver width, preventing consistent edge tone mapping and improving decoding accuracy while maintaining overall system simplicity.
Solution Approach 2:
The patent introduces asymmetry between the REG bundle quantity per PRG and the interleaver width. This asymmetric configuration ensures that REG bundles do not consistently map to edge resource blocks, thereby improving channel estimation quality and decoding accuracy without significantly complicating the resource allocation mechanism.
3Stability of the object's composition
If the quantity of REG bundles per PRG equals the interleaver width, then mapping consistency is improved, but channel estimation quality deteriorates due to repeated edge tone mapping
Solution Approach 1:
The patent fundamentally changes the parameter relationship by configuring the quantity of REG bundles per PRG to be different from the interleaver width. This parameter change breaks the repeated mapping pattern to edge tones while maintaining controlled consistency through the cyclic shift mechanism, thereby improving channel estimation quality.
Solution Approach 2:
The patent introduces dynamics into the mapping system through cyclic shifts of REG bundles across different PRGs. This dynamic approach allows the mapping pattern to vary in a controlled manner, preventing consistent edge tone mapping while maintaining overall system structure and consistency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling indicating a control channel configuration associated with reference signal sharing across multiple control channels of a control resource set cycling of a resource element group (REG) bundles in multiple physical resource groups (PRGs) of the control resource set. The UE may receive reference signals via the PRGs and monitor for at least one control message of a first control channel via a first control channel element (CCE) of a first PRG and a second CCE of a second PRG. In some examples, a quantity of REG bundles per PRG is coprime to a width of an REG bundle interleaver that interleaved the control message into the CCEs.