Autonomous FTR Slot Selection for Heterogeneous Network Interference
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Solution Overview
Problem
In heterogeneous wireless networks, the deployment of Fractional Time Reuse (FTR) is challenging due to the lack of knowledge about neighboring base stations, especially with increasing numbers of small cells causing interference at cell edge areas, and requires advanced coordination among neighboring base stations for time slot allocation.
Innovation Solution
Autonomous FTR techniques that allow base stations to pseudo-randomly select FTR slots without coordinating with neighboring stations, using a pseudo-random distribution model to determine the FTR factor and transmit subframes, reducing inter-cell interference by selecting a factor much greater than the estimated number of neighboring base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If centralized FTR coordination among neighboring base stations is implemented, then inter-cell interference is minimized, but device complexity and coordination overhead increase significantly
Solution Approach 1:
Each base station autonomously determines its own FTR slots by independently analyzing UE measurement reports and calculating FTR factors without requiring coordination messages or synchronization with neighboring base stations. The base station serves itself by making local decisions based on available measurement data, eliminating the need for complex inter-station coordination mechanisms.
Solution Approach 2:
The network is divided into independent autonomous decision-making units where each base station operates independently. Instead of a centralized coordination system managing all base stations, each base station segments the FTR determination process and executes it locally, reducing overall system complexity while maintaining interference mitigation effectiveness.
2Productivity
If advanced coordination among neighboring base stations is required for FTR deployment, then frequency reuse factor is maximized, but ease of operation and deployment difficulty worsen
Solution Approach 1:
Base stations automatically perform FTR configuration without human intervention or coordination procedures. The system self-configures by collecting UE measurement reports, calculating appropriate FTR factors, and selecting transmit subframes autonomously, making deployment as simple as enabling the feature while achieving frequency reuse factor one.
Solution Approach 2:
The system dynamically adjusts FTR parameters (FTR factor M and transmit subframe selection) based on real-time UE measurement reports and network conditions. This automatic parameter adaptation allows the system to optimize frequency reuse without manual configuration or coordination, simplifying deployment while maintaining high productivity.
3Ease of operation
If FTR is deployed without knowledge of neighboring base stations, then ease of operation improves, but reliability of interference mitigation decreases
Solution Approach 1:
The autonomous FTR system continuously monitors UE measurement reports (CQI, CPICH RSCP, Ec/No) as feedback about downlink signal conditions and inter-cell interference. Based on this feedback, base stations dynamically adjust FTR factors and transmit subframe selections to maintain effective interference mitigation without requiring knowledge of neighboring base station configurations.
Solution Approach 2:
Base stations perform preliminary analysis of UE measurement reports to predict interference conditions and pre-select appropriate FTR slots before actual transmission occurs. This preliminary action based on measurement feedback ensures reliable interference mitigation is achieved autonomously without needing neighboring base station information.
Data Source
AI summary
Autonomous fractional time reuse is provided. In some embodiments, autonomous fractional time reuse includes determining a number of neighboring base stations of a base station in a heterogeneous network; and pseudo randomly selecting one or more Fractional Time Reuse (FTR) slots for transmission by the base station. In some embodiments, the one or more FTR slots are autonomously selected by the base station without coordinating the selection of the one or more FTR slots with one or more of the neighboring base stations.