Coexistence Manager for Wireless Spectrum Interference Control
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Solution Overview
Problem
In wireless communication systems, coexistence of multiple secondary user networks is challenging due to interference issues, especially when networks from different operators or using different protocols attempt to access unoccupied spectrum, and managing this coexistence while avoiding interference with primary users is difficult.
Innovation Solution
A coexistence manager is installed in the system to acquire and manage spectrum holes, determine potential interference, and notify secondary users to adjust their operations, using a database to store necessary information and generate control messages to ensure non-interfering coexistence, including adjusting transmission outputs and time slots to maximize quality of coexistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple secondary users access the same spectrum simultaneously, then spectrum utilization efficiency is improved, but interference among secondary users and with primary users increases
Solution Approach 1:
The patent introduces a coexistence manager as an intermediary entity that mediates between multiple secondary users and primary users. The coexistence manager collects sensing information from secondary users, determines spectrum availability, and coordinates access to prevent interference. This intermediary manages the spectrum sharing process centrally, allowing multiple secondary users to access the same spectrum efficiently while maintaining protection for primary users through coordinated transmission timing and power control.
2Reliability
If a coexistence manager is introduced to manage spectrum sharing, then interference control is improved, but system complexity increases
Solution Approach 1:
The coexistence manager is designed as a multi-functional entity that performs spectrum sensing information collection, interference determination, access coordination, and transmission parameter optimization. By consolidating these multiple functions into a single manager, the system avoids the complexity of having each secondary user independently perform all these functions, thereby improving interference control while keeping the overall system complexity manageable through functional integration.
3Reliability
If secondary users dynamically adjust transmission parameters, then coexistence performance is improved, but control complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the coexistence manager continuously monitors transmission parameters and interference levels, then adjusts transmission power, time slots, and frequency selections of secondary users accordingly. This feedback loop enables dynamic optimization of coexistence performance by adapting to changing spectrum conditions while the coexistence manager handles the control complexity, allowing secondary users to operate with simplified local control logic.
Data Source
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AI summary
Disclosed is a wireless communication system capable of avoiding interference even when a network including a secondary user coexists. The wireless communication system includes a primary user belonging to a first network, a first secondary user belonging to a second network, and a coexistence manager (CM). The coexistence manager (CM) acquires information relating to spectrum holes that are, at least temporarily, not in use by the primary user. In addition, the coexistence manager (CM) determines whether or not usage of the spectrum holes by the first secondary user causes interference. If the determination result is that interference is caused, coexistence manager (CM) notifies to this effect a second secondary user belonging to a third network, which differs from the second network.