Hybrid Time Reuse for Wireless Interference Management
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Solution Overview
Problem
Wireless communication systems face challenges in managing interference, particularly in small-coverage base stations where RF coverage is not optimized, leading to issues like RF interference, unsupported soft handover, and restricted association, which affect signal quality and user experience.
Innovation Solution
The implementation of hybrid time reuse in wireless communication systems, which involves determining and adjusting time reuse patterns to maximize the signal-to-noise ratio by controlling the transmission of access points, using interference controllers to manage interference between neighboring access points and access terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small-coverage base stations are deployed ad-hoc to provide indoor wireless coverage, then coverage robustness is improved, but RF interference increases due to non-optimized RF coverage
Solution Approach 1:
The patent implements time reuse patterns where access points periodically switch between transmitting and listening states. This periodic action allows neighboring access points to alternate their transmission times, reducing RF interference while maintaining coverage robustness. The system divides time into frames with different reuse patterns applied to different access points.
Solution Approach 2:
The patent changes the time reuse pattern parameters dynamically based on detected interference conditions. When interference is detected from neighboring unplanned access points, the system adjusts the time reuse pattern (e.g., switching between 1x, 2x, 3x, or 4x time reuse) to optimize the signal-to-noise ratio and minimize interference impact.
2Reliability
If access points use restricted association to control access, then network security is improved, but interference management capability deteriorates
Solution Approach 1:
The patent segments the time resource into multiple reuse patterns and assigns different patterns to different access points. This segmentation allows the system to manage interference from restricted association access points by coordinating their transmission times, enabling interference management while maintaining security restrictions.
Solution Approach 2:
The patent implements feedback mechanisms where access points detect interference from neighboring access points and report conditions to the network. Based on this feedback, the system adjusts time reuse patterns dynamically, enabling restricted association access points to participate in interference management through coordinated time sharing.
3Productivity
If time reuse patterns are adjusted to maximize signal-to-noise ratio, then communication performance is improved, but system complexity increases due to pattern determination and adjustment
Solution Approach 1:
The patent enables access points to autonomously detect interference from neighboring unplanned access points and self-adjust their time reuse patterns. This self-service capability improves communication performance by maximizing signal-to-noise ratio while distributing the complexity management across individual access points rather than requiring centralized control.
Solution Approach 2:
The patent adjusts time reuse pattern parameters (such as the reuse factor and frame structure) based on detected signal-to-noise conditions. By dynamically changing these parameters, the system optimizes communication performance while the standardized adjustment procedures help manage the complexity of pattern determination.
Data Source
AI summary
Interference that occurs during wireless communication may be managed by hybrid time reuse. A method, apparatus amend medium of communication determines one or more time reuse patterns of respective one or more unplanned access points. A second time reuse pattern that is less interfering with the one or more time reuse patterns is selected. Signals are transmitted according to the second time reuse pattern from a second unplanned access point to an associated access terminal.