UE-to-UE Interference Measurement in TDD Cellular Systems
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Solution Overview
Problem
In cellular communication systems using Time Division Duplex (TDD), uplink and downlink transmissions often interfere due to shared spectrum, leading to degraded performance and communication obstructions between users in different cells, which existing methods have not adequately addressed.
Innovation Solution
A method where User Equipment (UE) measures and reports uplink signal interference to the network, enabling interference-aware configuration and suppression, allowing for improved scheduling, link adaptation, and beamforming to mitigate UE-to-UE interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD spectrum sharing is used to increase spectral efficiency, then system capacity is improved, but interference between uplink and downlink transmissions occurs
Solution Approach 1:
The network device performs preliminary interference measurement during uplink timeslots by capturing uplink signals from neighboring cells before they cause interference to downlink transmissions. This advance measurement allows the system to proactively identify and characterize interference sources, enabling subsequent interference mitigation actions to be taken before performance degradation occurs
Solution Approach 2:
The system establishes a feedback loop where measurement information about uplink interference is reported back to the network device, which then uses this information to configure downlink transmissions. The network device adjusts downlink resource allocation, power levels, or beamforming parameters based on the measured interference characteristics, creating a closed-loop control system that continuously optimizes performance
2Productivity
If uplink transmissions from neighboring cells are allowed to increase system utilization, then resource efficiency is improved, but UE-to-UE interference increases
Solution Approach 1:
The network device performs preliminary interference measurement during uplink timeslots by capturing uplink signals from neighboring cells before they cause interference to downlink transmissions. This advance measurement allows the system to proactively identify and characterize interference sources, enabling subsequent interference mitigation actions to be taken before performance degradation occurs
Solution Approach 2:
The system establishes a feedback loop where measurement information about uplink interference is reported back to the network device, which then uses this information to configure downlink transmissions. The network device adjusts downlink resource allocation, power levels, or beamforming parameters based on the measured interference characteristics, creating a closed-loop control system that continuously optimizes performance
3Reliability
If interference measurement and reporting is implemented to reduce interference, then transmission quality is improved, but device complexity increases
Solution Approach 1:
User equipment automatically performs interference measurement and generates reports without requiring complex manual configuration or intervention. The UE autonomously identifies uplink signals from neighboring cells, measures their characteristics, and reports the findings to the network device, simplifying the overall system architecture while maintaining high transmission quality
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
There is provided mechanisms to obtain, report and/or use measurement information representing so-called UE-to-UE interference between UEs (10, 20) to enable interference-aware configuration of at least one transmission and/or interference suppression in a cellular communication system.