Remote Interference Mitigation in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively managing remote interference caused by atmospheric ducting phenomena, leading to signal interference between base stations due to propagation delays and differing frame structures, which can result in over or undercompensation of interference mitigation schemes.
Innovation Solution
The proposed solution involves transmitting reference signals (RIM-RS) to detect and mitigate remote interference by agreeing on maximum downlink and uplink transmission boundaries, using frameworks like Framework-1 and Framework-2, and providing configuration information such as slot format details to accurately determine affected uplink symbols, thereby optimizing interference mitigation without impacting system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If remote interference mitigation schemes are applied to counteract atmospheric ducting interference, then interference between base stations is reduced, but system performance may be negatively impacted due to over or undercompensation
Solution Approach 1:
The patent implements a feedback mechanism where the interfered base station detects remote interference, transmits reference signals (RIM-RS) to the interfering base station, and provides interference indication information. The interfering base station uses this feedback to determine the actual interference situation and adjust its mitigation scheme accordingly, preventing over or undercompensation and maintaining system performance.
Solution Approach 2:
The patent changes the parameter of transmission timing by introducing specific time-domain characteristics for reference signals. The RIM-RS is transmitted in specific time slots (e.g., last downlink symbol or first uplink symbol of a slot) rather than continuously, allowing precise control of interference mitigation timing and avoiding performance degradation from unnecessary mitigation actions.
2Measurement precision
If reference signals are transmitted continuously to detect remote interference, then detection accuracy is improved, but transmission overhead and system resource consumption increase
Solution Approach 1:
The patent implements periodic transmission of reference signals for interference detection. Instead of continuous transmission, the RIM-RS is transmitted periodically in specific time slots (e.g., every slot or at specific intervals), maintaining detection capability while significantly reducing transmission overhead and resource consumption compared to continuous transmission.
3Device complexity
If interference mitigation schemes are applied without accurate interference detection, then system complexity is reduced, but interference management effectiveness deteriorates
Solution Approach 1:
The patent introduces an intermediary mechanism using reference signals (RIM-RS) as a mediator between the interfered and interfering base stations. The interfered base station transmits RIM-RS that the interfering base station can detect, providing accurate interference information without requiring complex direct detection algorithms. This intermediary approach simplifies the overall system while maintaining effective interference mitigation.
Data Source
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Figure 3
Figure 4A~4C
AI summary
A method of wireless communication includes receiving, at a first communication node, information that includes one or more parameters indicating a time-domain characteristic of one or more interfered symbols due to a remote interference between the first communication node and a second communication node. The method also includes performing, by the first communication node, subsequent communications based on the information.