Adaptive Interference Feedback Window for RAN Resource Scheduling
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Solution Overview
Problem
Intercell interference in wireless networks leads to low network key performance indicators and quality of service issues, particularly affecting spectral efficiency and user equipment QoS, due to ineffective existing interference mitigation techniques, such as static null beamforming, sub-band channel quality indicators, and channel reuse approaches.
Innovation Solution
A centralized controller adapts frequency and transmission time intervals of intercell interference avoidance feedback and decision windows based on user equipment traffic patterns and QoS requirements, using a dynamic reporting mechanism to optimize resource allocation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If null beamforming is used to direct beam nulls towards UEs served by neighboring cells, then intercell interference is reduced, but device complexity and control overhead increase
Solution Approach 1:
The patent extracts and isolates the interference mitigation function into a separate network controller entity that operates independently from the base stations. This controller collects interference information from multiple cells, processes it centrally, and generates coordination decisions, thereby reducing the complexity burden on individual base station devices while achieving interference reduction through centralized intelligence.
Solution Approach 2:
The patent introduces a network controller as an intermediary entity that mediates between multiple base stations. This controller receives interference information from base stations, processes it centrally, and generates coordination decisions, thereby reducing the complexity burden on individual base stations while achieving interference reduction through centralized intelligence.
2Productivity
If sub-band CQI reporting is used to select resource block groups with highest channel quality, then spectral efficiency is improved, but control channel usage increases excessively due to scattering UE data transmission over multiple time slots
Solution Approach 1:
The patent merges the interference coordination function with the existing CQI reporting mechanism. Instead of treating them as separate processes, the network controller utilizes the already-present CQI reporting channels to also convey interference information, thereby combining multiple functions into a single communication framework and reducing additional control channel overhead.
3Object-affected harmful factors
If frequency is reused between different cells with static non-overlapping spectrum allocation, then intercell interference is avoided, but spectral efficiency decreases when traffic load is not uniformly distributed, and service interruptions occur during reconfiguration
Solution Approach 1:
The patent transforms the static frequency allocation scheme into a dynamic one where spectrum resources are allocated based on real-time interference conditions and traffic demands. The network controller continuously monitors interference levels and adjusts spectrum assignments dynamically, allowing the system to adapt to varying traffic loads across different cells and time periods, thereby maintaining both interference avoidance and high spectral efficiency.
Solution Approach 2:
The patent changes the allocation parameters from fixed static values to dynamic values that adjust based on traffic load and interference conditions. The network controller modifies spectrum allocation parameters in real-time, allowing each cell to optimize its resource usage according to current network conditions, thereby improving spectral efficiency while maintaining interference coordination.
Data Source
AI summary
The described technology is generally directed towards dynamically adapting the parameter data of an intercell interference avoidance feedback and decision window (e.g., sizing and frequency) to obtain interference-related data from a UE. The interference-related data analyzed from a returned window is used to recommend a decision to a ran node as to which radio resources should be avoided when scheduling UE-related communications to avoid intercell interference. A controller (e.g., RIC) dynamically attempts to optimize the frequency and periodicity of the intercell interference avoidance feedback and decision windows to be transmitted, based on measurements and KPIs from the RAN node, e.g., UE traffic pattern data and QoS requirements, as well as performance capability data of the node. The node can accept the window parameter data or reject the request for reprocessing by the controller.