UE-Triggered Coordinated Transmission for Inter-Cell Interference Control
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Solution Overview
Problem
Current wireless communication systems face challenges in controlling inter-cell interference, particularly at the cell edge, which limits spectrum efficiency and increases network overhead, while also requiring significant resources and complex UE processing.
Innovation Solution
A method and system that allow UE to detect interference conditions using dynamically defined signal quality metrics, enabling coordinated transmission techniques between cells at Layer 2 or physical levels, optimizing network resources and reducing UE power consumption by focusing on specific frequency ranges and triggering coordinated transmission only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If coordinated transmission techniques are implemented between cells, then inter-cell interference is reduced, but network overhead increases due to information exchange between cells
Solution Approach 1:
The UE autonomously detects interference conditions by measuring signal quality metrics (RSRP, SINR) and compares them against thresholds. When interference is detected, the UE itself triggers the coordinated transmission request by sending an uplink message to the network, eliminating the need for continuous network-initiated interference detection and reducing signaling overhead.
Solution Approach 2:
The system implements a feedback mechanism where the UE measures downlink signal quality, determines interference conditions, and provides this information back to the network via uplink channels. The network uses this feedback to activate or deactivate coordinated transmission modes dynamically, optimizing the balance between interference reduction and overhead management.
2Productivity
If coordinated transmission is activated between multiple cells, then spectrum efficiency is improved, but UE power consumption increases due to additional processing and measurements
Solution Approach 1:
The coordinated transmission system dynamically adapts to changing radio conditions by continuously monitoring signal quality metrics. The UE only activates coordinated transmission when interference thresholds are exceeded, allowing the system to transition between conventional and coordinated modes based on real-time conditions, thereby optimizing spectrum efficiency while minimizing unnecessary UE processing and power consumption during low-interference periods.
3Measurement precision
If interference detection is performed continuously, then interference conditions are accurately detected, but network resources and UE processing load increase
Solution Approach 1:
Instead of continuous interference detection, the system performs partial monitoring by measuring signal quality metrics only at specific intervals and comparing them against predetermined thresholds. The UE measures RSRP and SINR of serving and neighboring cells, and only triggers coordinated transmission when the difference exceeds a threshold, reducing processing load while maintaining adequate detection accuracy for triggering the coordination mechanism.
Data Source
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AI summary
It is disclosed a method for coordinated transmission in a plurality of cells of a wireless communication system, wherein a user equipment (112) triggers coordinate transmission of a plurality of cells (113) if it detects an interference condition between signals received by said plurality of cells, the user equipment detecting said interference condition based on a radio quality metric dynamically set by the network and triggering coordinate transmission by transmitting a trigger signal to at least a cell of said plurality. It is also disclosed a radio equipment and a user equipment for use in a wireless communication system wherein coordinated transmission is implemented via the above method.