Quiet Period Server Synchronization for Dynamic Spectrum Access
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Solution Overview
Problem
Existing dynamic spectrum access systems fail to synchronize quiet periods across different secondary wireless communication systems, leading to interference and false detection of secondary transmissions as primary users, which complicates efficient spectrum sensing and usage.
Innovation Solution
Implementing a Quiet Period Server (QPS) and Quiet Period Client (QPC) architecture that coordinates and synchronizes quiet periods across multiple secondary systems, ensuring that all systems follow the same quiet period rules to minimize interference and enhance spectrum sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple secondary systems operate independently without quiet period synchronization, then each system can autonomously manage its spectrum sensing, but false detection of secondary transmissions as primary users occurs and spectrum sensing performance deteriorates
Solution Approach 1:
The patent merges the quiet period scheduling of multiple secondary systems into a unified synchronized schedule. Instead of each system operating independently with potentially conflicting quiet periods, the invention coordinates all secondary systems to share common quiet period time slots, ensuring that spectrum sensing can be performed without interference from any secondary system's transmissions.
Solution Approach 2:
The patent introduces a quiet period coordinator as an intermediary entity that manages and synchronizes the quiet periods across multiple secondary systems. This coordinator receives quiet period requirements from various secondary systems, determines a unified schedule, and distributes it back to all systems, thereby preventing false detections and improving spectrum sensing accuracy without requiring direct complex interactions between all secondary systems.
2Productivity
If secondary systems use spectrum sensing to detect primary users, then spectrum utilization is improved, but secondary transmissions increase noise levels and interfere with primary user detection
Solution Approach 1:
The patent implements preliminary action by scheduling quiet periods before spectrum sensing operations. Secondary systems are required to cease transmissions during these pre-scheduled quiet periods, ensuring that when spectrum sensing occurs, the radio frequency environment is free from secondary system transmissions. This preliminary cessation of transmissions prevents noise contamination of the sensing process while still allowing secondary systems to utilize the spectrum during non-quiet periods.
3Reliability
If intra-system quiet period coordination is implemented, then sensing performance within a single system is improved, but interference between different secondary systems remains unresolved
Solution Approach 1:
The patent extends the quiet period coordination mechanism from intra-system to inter-system scope, creating a universal solution that works across multiple secondary systems regardless of their specific implementations. The quiet period coordinator and synchronized schedule approach is designed to be system-agnostic, allowing different secondary systems with different requirements to coexist and coordinate effectively, thereby improving both reliability and adaptability.
Data Source
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AI summary
The present invention relates to the technical field of dynamic spectrum access. Synchronization of quiet periods for spectrum sensing can significantly benefit sharing of available secondary access spectrum between two or more wireless communication systems in the same geographic region (10). The object of the present invention is to provide a methodology by which quiet periods can be synchronized in time between different secondary access wireless communication systems. Quiet Period Clients (QPC) of secondary access wireless communication systems (1,2,3) are adapted to send requests to a Quiet Period Server (QPS) to obtain a quiet period rule set. The QPC receives from the QPS an answer specifying the quiet period rule set, and optional quiet period synchronization information. The systems(1,2,3) perform their transmissions in accordance with the received rules.