Cognitive Radio Database Server EIRP Recalculation
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Solution Overview
Problem
Cognitive Radio (CR)-based wireless communication systems face challenges in accurately determining channel usage by licensed systems, leading to potential interference and performance deterioration due to the inefficiency of spectrum sensing methods.
Innovation Solution
An apparatus and method are introduced to manage channel usage information by utilizing band scheduling information stored in a Database (DB) server, which recalculates and transmits maximum allowed Equivalent Isotropically Radiated Power (EIRP) for each channel, enabling CR-based devices to select operational channels and control transmit power effectively without interfering with licensed systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spectrum sensing function is used to recognize channel usage, then channel selection can be performed, but measurement precision and reliability of channel usage recognition deteriorate
Solution Approach 1:
The patent introduces a database server as an intermediary that stores and manages band scheduling information of licensed systems. Instead of relying solely on spectrum sensing, the cognitive radio system queries the database server to obtain accurate channel usage information. This intermediary provides centralized, reliable data about which channels are occupied by licensed systems, thereby improving measurement precision without sacrificing adaptability.
Solution Approach 2:
The database server performs preliminary actions by pre-storing band scheduling information of licensed systems before the cognitive radio system needs to operate. This advance preparation allows the cognitive radio to quickly query and obtain accurate channel usage information without performing lengthy spectrum sensing operations, thereby improving both measurement precision and operational efficiency.
2Reliability
If continuous spectrum sensing is performed to detect licensed system signals, then channel usage can be monitored, but performance of the CR-based system deteriorates due to long detection time
Solution Approach 1:
The database server pre-stores band scheduling information indicating when and which channels licensed systems will use. This preliminary action eliminates the need for continuous spectrum sensing, as the cognitive radio system can simply query the database to obtain up-to-date channel availability information, thereby maintaining reliability while dramatically improving productivity.
Solution Approach 2:
The system implements a feedback mechanism where the cognitive radio device periodically queries the database server for updated band scheduling information. This feedback loop ensures the system has current channel usage data without requiring continuous sensing, balancing reliability with improved system performance and reduced detection time.
3Productivity
If frequency resources are reused in temporarily unused time durations, then productivity increases, but interference with licensed systems may occur
Solution Approach 1:
The database server acts as an intermediary that provides authoritative information about licensed system band scheduling. Before reusing frequency resources, the cognitive radio system queries the database to obtain accurate scheduling information and determines appropriate transmit power levels. This intermediary guidance ensures high frequency resource utilization while preventing interference with licensed systems through informed power control.
Solution Approach 2:
The system dynamically adjusts transmit power parameters based on band scheduling information obtained from the database server. By changing power levels according to the operational status of licensed systems, the cognitive radio system can maximize frequency resource reuse during unused periods while automatically reducing or eliminating transmission when licensed systems are active, thereby preventing interference.
Data Source
AI summary
A method of operating a Data Base (DB) server for storing spectrum condition information on a licensed system in a Cognitive Radio (CR)-based wireless communication system and a CR-based wireless communication system are provided. The method includes determining changes in the spectrum condition information on the licensed system, recalculating maximum Equivalent Isotropically Radiated Power (EIRP) allowed for each channel of CR-based devices registered in a list, and transmitting information regarding the recalculated maximum allowed EIRP.