Interference Mitigation Triggering in Heterogeneous LTE Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In cellular communications networks, especially in heterogeneous LTE networks, existing interference mitigation techniques face challenges in accurately estimating and mitigating inter-cell interference, leading to suboptimal channel quality estimation and user throughput due to colliding or non-colliding reference signals and varying traffic loads in aggressor cells.
Innovation Solution
A system and method that trigger interference mitigation at a wireless device based on signal load, reference signal relation, and timing relation between serving and interfering cells, using network-assisted signaling to enable the wireless device to perform interference cancellation or suppression only when necessary, thereby improving interference measurement accuracy and user throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference mitigation is continuously performed at the wireless device, then interference measurement accuracy is improved, but power consumption and processing complexity increase
Solution Approach 1:
The patent implements dynamic triggering of interference mitigation based on real-time conditions. The wireless device or network node determines whether interference mitigation should be performed by evaluating criteria such as reference signal collision status and traffic load in aggressor cells. This dynamic approach allows interference mitigation to be activated only when necessary, rather than continuously, thereby reducing power consumption while maintaining measurement accuracy when needed.
Solution Approach 2:
The patent changes the operational state of interference mitigation from a static continuous mode to a dynamic triggered mode based on specific parameters. The triggering decision is made by evaluating parameters including reference signal collision detection, traffic load thresholds in aggressor cells, and timing relations. This parameter-based triggering mechanism optimizes the balance between measurement accuracy and power consumption by adapting the mitigation behavior to current network conditions.
2Measurement precision
If interference mitigation is continuously performed at the wireless device, then channel quality estimation is improved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic triggering of interference mitigation based on real-time conditions. The wireless device or network node determines whether interference mitigation should be performed by evaluating criteria such as reference signal collision status and traffic load in aggressor cells. This dynamic approach allows interference mitigation to be activated only when necessary, rather than continuously, thereby reducing processing complexity while maintaining channel quality estimation accuracy when needed.
Solution Approach 2:
The patent changes the operational state of interference mitigation from a static continuous mode to a dynamic triggered mode based on specific parameters. The triggering decision is made by evaluating parameters including reference signal collision detection, traffic load thresholds in aggressor cells, and timing relations. This parameter-based triggering mechanism optimizes the balance between estimation accuracy and processing complexity by adapting the mitigation behavior to current network conditions.
3Object-affected harmful factors
If resource partitioning is used between serving and neighboring cells, then inter-cell interference is mitigated, but network flexibility and adaptability are reduced
Solution Approach 1:
The patent enables the wireless device to autonomously perform interference mitigation by detecting reference signal collisions and evaluating traffic load conditions. The device can autonomously determine when interference mitigation is needed and execute the mitigation process without requiring pre-configured resource partitioning schemes. This self-service approach maintains network flexibility while effectively mitigating inter-cell interference through device-side intelligence.
Solution Approach 2:
The patent implements a feedback mechanism where the wireless device or network node continuously monitors reference signal collision status and traffic load conditions in aggressor cells. Based on this feedback information, the system dynamically triggers interference mitigation only when the evaluated criteria indicate interference problems. This feedback-driven approach provides adaptability to varying network conditions without requiring rigid resource partitioning, thereby maintaining network flexibility while effectively managing interference.
Data Source
AI summary
Systems and methods for triggering interference mitigation at a wireless device in a cellular communications network are disclosed. In one embodiment, a node associated with a cellular communications network makes a determination to trigger interference mitigation at a wireless device based on a signal load in at least one interfering cell from which transmissions result in interference at the wireless device during reception from a desired cell, a relation between reference signals used in the desired cell and the at least one interfering cell, and a timing relation between at least one of a group consisting of: signals transmitted by the desired cell and the at least one interfering cell and signals received at the wireless device from the desired cell and the at least one interfering cell. In response to making the determination, the node triggers interference mitigation at the wireless device.