Full Duplex Reference Signal Configuration for Interference Management
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Solution Overview
Problem
Full-duplex operation in wireless communications faces challenges in managing interference, particularly self-interference and UE-to-UE co-channel interference, which limits spectral efficiency and increases latency due to the concurrent transmission and reception at the same time and frequency resource.
Innovation Solution
The implementation of new Full-Duplex Reference Signals (FD-RS) configurations, including UL FD-RS and DL FD-RS, for interference measurement and reporting, allowing for simultaneous activation and deactivation of these signals to manage interference, along with specific multiplexing types and time-domain behaviors, enables effective interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex operation is implemented to enable concurrent UL and DL transmissions, then spectral efficiency is improved, but interference (self-interference and UE-to-UE co-channel interference) increases
Solution Approach 1:
The system performs preliminary interference measurement using dedicated FD-RS signals before actual data transmission. The gNB configures UEs with UL and DL FD-RS resources to measure interference levels in advance, allowing the network to identify and mitigate interference issues before they affect productive transmissions, thus enabling full-duplex operation while managing interference proactively
Solution Approach 2:
Full-Duplex Reference Signals (FD-RS) serve as intermediary measurement signals that facilitate interference assessment without disrupting actual data transmissions. These dedicated reference signals act as mediators that allow the system to measure and report interference levels (CLI, SL, and self-interference) while maintaining concurrent UL and DL transmissions, thus resolving the contradiction between productivity and harmful factors
2Object-generated harmful factors
If TDD is used to avoid interference, then interference is reduced, but UL and DL transmission opportunities are limited and latency increases
Solution Approach 1:
The system dynamically switches between TDD and full-duplex modes based on interference conditions and traffic requirements. By using FD-RS measurements to assess interference levels in real-time, the network can dynamically activate full-duplex resources when interference is manageable, thereby reducing latency compared to static TDD configurations while maintaining interference control through continuous measurement and reporting
3Measurement precision
If full-duplex reference signal configurations are implemented for interference measurement, then interference management capability is improved, but device complexity increases
Solution Approach 1:
The Full-Duplex Reference Signal (FD-RS) design uses universal signal structures and configurations that can serve multiple measurement purposes simultaneously. The same FD-RS framework supports measurement of CLI, SL, and self-interference through unified configuration procedures and reporting mechanisms, reducing device complexity compared to implementing separate measurement systems for each interference type
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for interference management for full-duplex operation. One apparatus includes a processor and a transceiver that receives a first configuration from a RAN, wherein the first configuration includes one or more of: an UL full-duplex reference signal (“FD-RS”) configuration, a DL FD-RS configuration, an indication to activate the UL FD-RS configuration, and/or an indication to activate the DL FD-RS configuration, where the UL FD-RS configuration and the DL FD-RS configuration are not simultaneously activated at the apparatus. The processor performs a first activity according to the first configuration, the first activity being one or more of: transmission on received UL FD-RS resources, measurement on received UL FD-RS resources, and/or measurements on the received DL FD-RS resources.