Adaptive Reference Signal Mapping for Wireless Networks
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Solution Overview
Problem
Current wireless multi-access communication networks, such as LTE, face inefficiencies in spectral usage due to fixed reference signal mapping configurations that do not account for varying UE parameters like modulation schemes and distance, leading to unnecessary overhead for lower modulation schemes and inadequate channel estimation for higher schemes in small cell environments.
Innovation Solution
Adaptive reference signal mapping configurations that dynamically adjust based on UE-specific parameters like modulation schemes, distance, and interference management capabilities, optimizing the allocation of resource elements for reference signals within Physical Downlink Shared Channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed reference signal mapping configuration is used, then device complexity is reduced and ease of operation is improved, but spectral efficiency deteriorates and channel estimation accuracy is insufficient for higher modulation schemes
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed reference signal mapping configuration to a dynamic one that adapts to UE-specific parameters. The base station determines communication parameters (modulation scheme, distance, interference management capability) and selectively applies different mapping configurations (first configuration for lower modulation schemes, second configuration for higher modulation schemes), enabling the system to optimize spectral efficiency while maintaining manageable complexity through parameter-based selection.
Solution Approach 2:
The patent implements parameter changes by modifying the reference signal mapping configuration based on UE communication parameters. When the modulation scheme changes (e.g., from QPSK to 64-QAM), the system changes the mapping configuration parameters to allocate reference signals appropriately, thereby improving spectral efficiency and channel estimation accuracy without requiring complete system redesign.
2Measurement precision
If reference signal overhead is increased for higher modulation schemes, then channel estimation accuracy is improved, but spectral efficiency is reduced due to increased overhead
Solution Approach 1:
The patent applies local quality by allocating different densities of reference signals to different UE groups based on their modulation schemes. UEs using higher modulation schemes (requiring better channel estimation) receive more frequent reference signals, while UEs using lower modulation schemes receive fewer reference signals. This localized optimization ensures each UE gets the appropriate channel estimation accuracy without uniformly increasing overhead across all UEs, thus preserving spectral efficiency.
Solution Approach 2:
The system changes the reference signal mapping configuration parameters dynamically based on the modulation scheme being used. For higher modulation schemes, the configuration parameters are adjusted to increase reference signal density, improving channel estimation accuracy. For lower modulation schemes, the parameters are adjusted to reduce reference signal density, minimizing overhead and maintaining spectral efficiency.
3Productivity
If adaptive reference signal mapping is implemented, then spectral efficiency is improved and channel estimation accuracy is optimized, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing UEs into different groups based on their communication parameters, particularly modulation schemes. The system segments the reference signal mapping configurations into at least two distinct types: a first configuration for lower modulation schemes and a second configuration for higher modulation schemes. This segmentation allows the base station to select the appropriate configuration for each UE group, achieving spectral efficiency optimization without requiring each individual UE to handle complex adaptive logic.
Solution Approach 2:
The system implements feedback mechanisms where the base station determines UE communication parameters (modulation scheme, distance, interference management capability) and uses this information to select the appropriate reference signal mapping configuration. The base station can signal the selected configuration to the UE, creating a feedback loop that enables adaptive optimization while centralizing the complexity management at the base station rather than distributing it to UEs.
Data Source
AI summary
Embodiments provide systems and methods for adaptive reference signal mapping in wireless multi-access communication networks, including LTE, WLAN, WiMAX, Bluetooth, etc. In an embodiment, the reference signal mapping configuration is user equipment (UE) specific and can be configured semi-statically or dynamically according to one or more communication related parameters of the UE. The one or more parameters can include, without limitation, a modulation scheme used for communication with the UE, a modulation and coding scheme (MCS) used for communication with the UE, a distance of the UE relative to the base station, an antenna configuration at the UE, interference management capability of the UE, and a rank of the UE.