Coexistence Interference Mitigation via Reference Signal Configuration
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Solution Overview
Problem
In wireless communication systems, particularly in 5G and new radio (NR) systems, user equipment (UE) experiences coexistence interference due to concurrent operation of multiple radio access technologies (RATs), which is undetectable by base stations, leading to costly and complex internal coordination or latency issues.
Innovation Solution
The UE transmits a configuration request to the base station to modify the reference signal configuration, including channel state information (CSI) reference signals and demodulation reference signals, to mitigate interference, allowing the base station to adjust its signal transmissions and reporting settings based on the received request.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs internal coordination functions to address coexistence interference, then the interference can be mitigated, but the complexity and cost increase
Solution Approach 1:
The patent introduces the base station as an intermediary to handle coexistence interference mitigation. Instead of the UE performing complex internal coordination, the UE simply indicates interference occurrence to the base station, which then adjusts reference signal configurations to resolve the interference issue.
Solution Approach 2:
The base station autonomously adjusts its own reference signal configurations in response to UE interference indications, eliminating the need for complex UE-side coordination mechanisms while achieving interference mitigation.
2Reliability
If the UE performs internal coordination functions to address coexistence interference, then the interference can be mitigated, but latency is introduced
Solution Approach 1:
The patent extracts the coordination function from the UE and relocates it to the base station. The UE only needs to indicate interference occurrence, while the base station handles the actual coordination and configuration adjustments, reducing UE processing latency.
Solution Approach 2:
The base station pre-configures multiple reference signal configurations and can quickly switch between them based on UE indications, enabling rapid response to interference without extensive real-time coordination negotiations.
3Ease of operation
If the base station uses default reference signal configuration, then the system operation is simple, but coexistence interference cannot be effectively mitigated
Solution Approach 1:
The patent implements a dynamic reference signal configuration system where the base station can switch between default and modified configurations based on real-time UE interference indications, maintaining simplicity during normal operation while enabling effective mitigation when needed.
Solution Approach 2:
The base station modifies reference signal configuration parameters (such as time-frequency resources, periodicity, or patterns) in response to UE interference indications, allowing flexible adaptation to coexistence interference while maintaining operational simplicity through standardized modification procedures.
Data Source
AI summary
In some wireless systems (e.g., 5G new radio (NR) systems), a user equipment (UE) may experience coexistence interference when using collocated radio transceivers to simultaneously communicate using different radio access technologies (RATs). To mitigate the coexistence interference, the UE may transmit a configuration request to a base station, where the configuration request may identify that the UE is operating on multiple RATs, identify that the UE is experiencing coexistence interference, or request specific reference signal settings or resources. The base station may modify reference signal transmissions and settings based on the configuration request. For example, the base station may transmit more frequent channel state information reference signals (CSIRS) to the UE, and the UE may report channel state information (CSI) more frequently in response. In other cases, the base station may modify a demodulation reference signal (DMRS) pattern, CSIRS resources, or CSI reporting settings based on the configuration request.