In-Device Coexistence Interference Mitigation in LTE-WLAN Aggregation
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Solution Overview
Problem
In-device coexistence interference occurs when multiple wireless technologies, such as LTE and WLAN, operate simultaneously, leading to communication quality, reliability, and throughput issues due to adjacent channel interference and spurious emissions, with existing solutions failing to effectively mitigate these problems in LTE-WLAN aggregation and interworking scenarios.
Innovation Solution
The implementation of measures to detect and mitigate in-device coexistence interference includes channel reconfiguration, deactivation of LTE-WLAN aggregation, and providing IDC indications to the eNB, allowing UEs to autonomously manage coexistence by avoiding interfering channels and configurations, and the eNB modifying settings to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless technologies (LTE and WLAN) operate simultaneously in adjacent bands, then radio resource utilization and communication throughput are improved, but in-device coexistence interference increases causing communication quality and reliability degradation
Solution Approach 1:
The UE monitors for IDC interference conditions and provides feedback to the eNB through IDC indication messages. The eNB uses this feedback information to adjust resource allocation and configuration parameters, creating a closed-loop system that adapts to interference conditions and maintains communication quality while preserving throughput opportunities.
Solution Approach 2:
The system dynamically adjusts operational parameters based on detected interference conditions. When IDC interference is detected, the eNB modifies resource allocation, transmission parameters, and channel configuration in real-time to mitigate interference effects, allowing the system to adapt between high-throughput modes and interference-avoidance modes as needed.
2Adaptability or versatility
If LTE-WLAN aggregation and interworking are implemented to enhance communication capabilities, then network flexibility and service quality are improved, but in-device coexistence interference problems increase
Solution Approach 1:
The system performs preliminary detection and assessment of IDC interference conditions before initiating LTE-WLAN aggregation or interworking operations. The UE evaluates potential interference scenarios in advance and provides indication messages to the eNB, allowing the network to pre-configure appropriate parameters and avoid harmful interference situations before they occur.
Solution Approach 2:
The eNB acts as an intermediary coordinator between LTE and WLAN operations. It receives IDC indication messages from the UE, processes the interference information, and mediates the conflict by adjusting resource allocation and configuration parameters to enable LTE-WLAN aggregation and interworking while mitigating the harmful interference effects.
3Ease of operation
If autonomous UE-based IDC mitigation measures are implemented, then interference management flexibility is improved, but system complexity and processing overhead increase
Solution Approach 1:
The UE autonomously monitors its own radio environment, detects IDC interference conditions, and generates IDC indication messages without requiring constant network control. This self-service capability allows the UE to independently manage its interference situation while the eNB provides higher-level coordination, distributing the complexity management between device and network.
Data Source
AI summary
There are provided measures for reduction of in-device co-existence interference. Such measures exemplarily comprise (in a mobile network scenario allowing co-operation of a first radio access technology with a second radio access technology) detecting a need to avoid an in-device co-existence interference in relation to said co-operation, and performing at least one action for avoiding the in-device co-existence interference.