ABS Resource Management in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous wireless networks, current time domain eICIC solutions struggle to coordinate Almost Blank Subframe (ABS) allocation across multiple aggressor cells, leading to resource wastage and frequent adjustments in protected resources, especially for pico cells located in overlapping areas of multiple macro cells, resulting in inadequate resource utilization for victim UEs.
Innovation Solution
A method and apparatus for categorizing ABS resources as primary and secondary, classifying UEs as fully or partially interfered, and scheduling ABS resources accordingly, allowing for adaptive ABS pattern adjustments based on utilization statuses from victim and aggressor base stations to minimize resource wastage and optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ABS resources are frequently adjusted to adapt to traffic fluctuation in small cells, then resource efficiency and power saving are improved, but the complexity of coordination between aggressor cells increases and system stability deteriorates
Solution Approach 1:
The patent segments ABS resources into different types (common ABS, dedicated ABS, flexible ABS) based on their coordination requirements and usage patterns. This segmentation allows the system to apply different adjustment strategies to different resource types, improving resource efficiency while controlling coordination complexity by limiting which resources require frequent inter-cell coordination.
Solution Approach 2:
The patent implements dynamic ABS configuration where the aggressor cell can adjust ABS patterns based on real-time traffic conditions and interference measurements. The system dynamically switches between different ABS patterns (first pattern, second pattern, third pattern) depending on the operational state, allowing adaptation to traffic fluctuation while maintaining system stability through controlled adjustment mechanisms.
2Adaptability or versatility
If ABS patterns are adjusted to meet variable DL transmission demands of victim cells, then adaptability is improved, but resource wastage increases due to frequent adjustments and coordination difficulties
Solution Approach 1:
The patent establishes preliminary ABS patterns (first ABS pattern, second ABS pattern, third ABS pattern) that are pre-configured for different operational scenarios. By having these patterns prepared in advance, the system can quickly switch between them based on traffic conditions without requiring frequent ad-hoc adjustments, thereby reducing coordination overhead and resource wastage while maintaining adaptability.
Solution Approach 2:
The patent implements a feedback mechanism where the victim cell reports resource utilization status and interference conditions to the aggressor cell. Based on this feedback, the aggressor cell intelligently adjusts ABS patterns only when necessary, avoiding unnecessary adjustments that would cause resource wastage. The feedback loop enables adaptive resource management with optimized adjustment frequency.
Data Source
AI summary
A method for a victim base station to manage almost blank subframe (ABS) resources in a heterogeneous network deployment is disclosed and the method comprises categorizing each of one or more protected ABS resources as one of a primary protected ABS resource and a secondary protected ABS resource, the one or more protected ABS resources allocated by a target aggressor base station and one or more neighbor aggressor base stations; classifying each of one or more associated UEs as a fully interfered UE or a partially interfered UE; and scheduling the one or more ABS resources for the one or more associated UEs based on the category of each categorized ABS resource and classified status of each associated UE.