NR Terminal CRS Interference Mitigation in DSS Spectrum Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Dynamic Spectrum Sharing (DSS) scenarios, LTE neighbor cells cause significant interference to NR cell data transmission due to persistent downlink Cell-specific Reference Signals (CRS), degrading reception reliability and accuracy in NR terminals.
Innovation Solution
A method where a terminal reports CRS interference mitigation capability to a base station, which provides neighbor cell CRS assist information, including configuration details, to enable accurate interference mitigation, and the terminal performs interference detection and mitigation based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DSS technology is used to share spectrum between LTE and NR, then spectrum utilization efficiency is improved, but interference from LTE neighbor cells to NR data transmission increases
Solution Approach 1:
The patent converts the harmful CRS interference from LTE neighbor cells into a beneficial signal by using it for interference mitigation. The terminal detects CRS signals from neighbor cells and uses this information to cancel or compensate for the interference in received NR signals, transforming the harmful interference into useful interference characterization data that improves reception reliability.
Solution Approach 2:
The patent implements preliminary interference mitigation by having the terminal report CRS interference mitigation capability to the network beforehand. The network then configures appropriate interference mitigation parameters and assists the terminal in preparing for interference cancellation before the actual data reception occurs, ensuring optimal performance when DSS is active.
2Reliability
If interference mitigation processing is performed on NR terminals, then reception reliability is improved, but terminal processing complexity increases
Solution Approach 1:
The patent implements self-service interference mitigation where the terminal autonomously detects CRS signals from neighbor cells, determines interference characteristics, and performs interference cancellation on its own. The terminal uses its own received signals and internal processing capabilities to mitigate interference without requiring complex network-side coordination or additional infrastructure, thereby improving reliability while controlling complexity.
3Loss of information
If CRS signals are continuously transmitted in LTE neighbor cells, then reference signal availability is improved, but interference to NR data transmission persists
Solution Approach 1:
The patent extracts the CRS interference signal from the composite received signal and separates it from the desired NR data signal. By identifying and isolating the CRS components from neighbor cells, the terminal can remove these extracted interference components from the received signal, thereby eliminating their harmful effect while preserving the availability of reference signals for LTE operations.
Data Source
AI summary
The present disclosure discloses an interference mitigation method and system, and a terminal, and a base station, and relates to the technical field of communication technology. The method of the present disclosure is executed by a terminal, including: reporting capability information of Cell-specific Reference Signal (CRS) interference mitigation to a base station, wherein the capability information of the CRS interference mitigation is used to indicate whether the terminal in a cell of a first mode supports the CRS interference mitigation of a neighbor cell of a second mode in a scenario with overlapping spectrum for the first mode and the second mode; receiving neighbor cell CRS assist information sent from the base station, wherein the neighbor cell CRS assist information comprises CRS related information of one or more neighbor cells of the second mode; and performing interference mitigation according to the neighbor cell CRS assist information.