RIM Reference Signal ID Encoding for Remote Interference Management
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G New Radio (NR) networks, face challenges in effectively identifying and mitigating remote interference due to atmospheric ducting and inadequate guard periods, which can lead to significant interference between network nodes, degrading uplink performance.
Innovation Solution
The implementation of a flexible Remote Interference Management (RIM) framework that utilizes a reference signal (RS) with a configurable transmission framework, allowing network nodes to identify and mitigate interference by transmitting a RIM-RS with a set ID and mapping it to specific time and frequency occasions, enabling adaptive interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed guard period is used in TDD networks, then the network structure is simple, but remote interference from atmospheric ducting cannot be effectively mitigated
Solution Approach 1:
The patent implements dynamic guard period configuration where the network node can adjust the guard period length based on detected interference conditions. The gNB monitors for atmospheric ducting interference and dynamically extends the guard period when needed, transitioning from a static to a dynamic system that adapts to changing propagation conditions.
Solution Approach 2:
The patent changes the parameter of guard period duration from a fixed value to a configurable parameter that can be adjusted based on interference detection. The system modifies the time parameter of the guard period to accommodate varying propagation delays caused by atmospheric ducting, allowing flexible adaptation to different interference scenarios.
2Reliability
If the guard period is extended to accommodate atmospheric ducting interference, then interference mitigation improves, but the time resources available for data transmission are reduced
Solution Approach 1:
The patent implements periodic monitoring of interference conditions where the network node continuously or periodically detects atmospheric ducting presence. The guard period extension is applied periodically based on detection results, allowing the system to balance interference protection with data transmission opportunities through time-division multiplexing of monitoring and data transmission phases.
Solution Approach 2:
The system performs preliminary detection of atmospheric ducting interference before it causes harmful effects. By monitoring for interference signatures in advance and extending the guard period proactively when ducting is detected, the system prevents interference from degrading uplink performance while minimizing impact on data transmission efficiency.
3Measurement precision
If network nodes transmit reference signals to identify interference sources, then interference identification capability improves, but the overhead in the time-frequency grid increases
Solution Approach 1:
The patent makes the reference signal serve multiple functions: it acts as both a channel estimation signal for normal operation and as an interference identification signal for atmospheric ducting detection. By embedding interference detection capability within the existing reference signal framework, the system avoids adding separate dedicated signals, thus reducing overall overhead while maintaining identification capability.
Solution Approach 2:
The network node uses its own transmitted reference signals to detect atmospheric ducting interference. The reference signal serves the dual purpose of normal channel estimation and self-detection of interference conditions, allowing the system to monitor its own transmission for signs of ducting without requiring separate monitoring signals.
Data Source
AI summary
A method, system and apparatus are disclosed. In one or more embodiments, a network node for remote interference identification is provided. The network node includes processing circuitry configured to cause transmission of at least one reference signal, RS, based at least in part on at least one RS sequence and at least one time occasion. An identifier of the network node is mapped to the at least one RS sequence and the at least one time occasion.