Secondary User Spectrum Access via Authorization Server
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Solution Overview
Problem
Ensuring that secondary wireless communication systems operating in spectrum reserved for primary users do not interfere with primary communications, particularly in metropolitan regions where public safety radio requires additional channel capacity, and ensuring appropriate regulation for enhanced secondary user operations.
Innovation Solution
A system where an access node contacts an authorization server to obtain authorized transmission parameters, which are secured with public key cryptography, ensuring that secondary users operate within designated channels and power levels, and subscriber units are authenticated to prevent unauthorized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If secondary users are allowed to operate in spectrum reserved for primary users, then spectrum utilization efficiency is improved, but interference with primary users may occur
Solution Approach 1:
A database system acts as an intermediary between secondary users and primary users. The database stores information about primary user operations and provides this information to secondary users, enabling them to identify and avoid frequencies being used by primary users. This mediator mechanism allows spectrum sharing while preventing interference.
2Adaptability or versatility
If enhanced operation levels are provided for trained users, then communication capability is improved, but system complexity and regulation difficulty increase
Solution Approach 1:
Different operation levels and capabilities are assigned to different users based on their training and authorization. The system provides enhanced capabilities (such as higher power levels or additional frequencies) specifically to authorized users who have demonstrated competence, while limiting other users to basic operations. This localized differentiation achieves enhanced capability where needed without uniformly increasing system complexity.
Data Source
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AI summary
A communication system (100) is facilitated by an access node (102) to support communication with subscriber units (104, 106) as secondary users of a regulated spectrum portion. The access node requests permission to operate as a secondary user from an authorization server (118). The authorization server provides authorized transmission parameters based on characteristics of the access node. The access node operates according to the authorized transmission parameters and provides the parameters to eligible subscriber units.