CSI-RS Allocation for Channel Measurement Accuracy
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Solution Overview
Problem
In future mobile communication systems, the low abundance ratio of CSI-RS reference signals hinders accurate channel state measurement, as they are primarily used for CSI measurement and not for data demodulation, leading to interference and reduced accuracy.
Innovation Solution
A base station apparatus allocates CSI-RSs at a higher abundance ratio for new mobile terminals and reports muted resources to existing terminals, allowing both to coexist without interference, enabling high-accuracy channel state measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the abundance ratio of CSI-RS reference signals is increased to improve channel state measurement accuracy, then measurement precision is improved, but existing mobile terminals experience interference and cannot adequately receive the reference signals
Solution Approach 1:
The patent segments the mobile terminal population into two groups: new terminals (first mobile terminal apparatus) that support high abundance ratio CSI-RS and can utilize all reference signal resources, and existing terminals (second mobile terminal apparatus) that are muted from certain resources. This segmentation allows each group to receive appropriate signal density without interference, resolving the contradiction between improved measurement precision and harmful interference to existing terminals.
Solution Approach 2:
The patent applies local quality by assigning different reference signal abundance ratios to different terminal groups. New terminals receive CSI-RS at a first abundance ratio (higher density) while existing terminals receive CSI-RS at a second abundance ratio (lower density with muting). This localized differentiation allows high measurement precision for new terminals without causing interference to existing terminals.
2Measurement precision
If the abundance ratio of reference signals is increased in a predetermined period, then channel state measurement accuracy is improved, but compatibility with existing mobile terminals deteriorates
Solution Approach 1:
The patent implements dynamic reference signal allocation where the abundance ratio of CSI-RS is adjusted based on the terminal type. The base station apparatus dynamically assigns high abundance ratio resources to new terminals and low abundance ratio resources to existing terminals through muting configurations. This dynamic adaptation maintains compatibility with existing terminals while enabling improved measurement precision for new terminals.
Solution Approach 2:
The patent changes the parameter of reference signal abundance ratio differently for different terminal groups. New terminals are configured with a first abundance ratio parameter (higher value) while existing terminals are configured with a second abundance ratio parameter (lower value with muting). This parameter differentiation resolves the contradiction between improved measurement precision and system compatibility.
3Measurement precision
If CSI-RS are allocated at high abundance ratio for new mobile terminals, then channel state measurement accuracy is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring muting patterns and abundance ratio parameters for different terminal groups before actual CSI-RS transmission. The base station apparatus establishes the allocation scheme in advance, where new terminals are pre-assigned high abundance ratio resources and existing terminals are pre-muted from certain resources. This preliminary configuration simplifies the actual transmission process while maintaining high measurement precision.
Data Source
AI summary
The present invention is designed to transmit and receive reference signals adequately even when the abundance ratio of reference signals in a predetermined period is increased. The present invention provides a base station apparatus that transmits CSI-RSs to the first mobile terminal apparatus which can receive CSI-RSs and to a second mobile terminal apparatus which can receive CSI-RSs that are set in a predetermined period at a lower abundance ratio than the first mobile terminal apparatus, and this base station apparatus allocates CSI-RSs to CSI-RS resource which can be muted at an abundance ratio which allows the first mobile terminal apparatus reception, reports the resources where CSI-RSs are allocated to the first mobile terminal apparatus, and, upon reporting the resources where CSI-RSs are allocated to the second mobile terminal apparatus, reports part of the resources as muted resources.