NR Terminal CRS Interference Mitigation for Accurate CQI Reporting
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Solution Overview
Problem
The dynamic spectrum sharing between 4G LTE and 5G NR systems results in LTE neighbor cell CRS interference affecting NR terminal channel quality detection, leading to inaccurate channel quality information reporting and subsequent resource allocation and scheduling by the NR base station.
Innovation Solution
An NR terminal reports LTE neighbor cell CRS interference mitigation capability information to the NR base station, which sends indication information through RRC signaling to enable or control CRS interference mitigation, and the NR terminal performs interference mitigation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the NR terminal performs channel quality detection without considering LTE neighbor cell CRS interference, then the channel quality detection complexity is reduced, but the accuracy of channel quality information reporting decreases
Solution Approach 1:
The NR terminal autonomously determines whether to perform CRS interference mitigation by checking if it supports the mitigation capability and if the NR base station sends CRS interference mitigation indication information. This self-service mechanism allows the terminal to independently decide on interference mitigation without complex network coordination, reducing detection complexity while maintaining accuracy when needed.
Solution Approach 2:
The system dynamically changes the channel quality detection parameters based on the CRS interference mitigation indication information from the base station and the terminal's capability. When mitigation is enabled, the terminal adjusts its detection parameters to account for CRS interference, improving measurement precision without permanently increasing complexity.
2Measurement precision
If the NR terminal always performs CRS interference mitigation, then the channel quality information accuracy is improved, but the energy consumption and processing complexity increase
Solution Approach 1:
The CRS interference mitigation is implemented dynamically rather than always being active. The NR base station sends CRS interference mitigation indication information to the NR terminal based on current network conditions, and the terminal adjusts its interference mitigation status accordingly. This dynamic approach ensures high measurement precision when needed while reducing energy consumption during normal operation.
Solution Approach 2:
The NR terminal autonomously manages its interference mitigation status by combining the base station's indication information with its own capability support. This self-service mechanism allows the terminal to activate mitigation only when necessary, avoiding continuous energy consumption while maintaining accuracy when required.
3Measurement precision
If the NR base station sends CRS interference mitigation indication information to all NR terminals, then the channel quality information accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The CRS interference mitigation indication information is sent selectively to specific NR terminals based on their capability to support the mitigation and their current channel conditions. Rather than broadcasting to all terminals, the base station applies the indication locally to terminals that need it, improving channel quality accuracy while minimizing signaling overhead.
Data Source
AI summary
The present invention relates to the field of mobile communications, and provides an information transmission method, a base station, a terminal, and a communication system. In the present invention, an NR terminal reports LTE neighboring cell CRS interference inhibition capability information of the NR terminal to an NR base station, and the NR base station receives the LTE neighboring cell CRS interference inhibition capability information reported by the NR terminal.