Cognitive Radio Terminal Collision Detection via Feature Sensing
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Solution Overview
Problem
As the number of unlicensed devices in a network increases, the potential for collisions between terminals in a distributed communication protocol deteriorates transmission efficiency, and existing interference detection systems require synchronization and may suppress signal transmission excessively, leading to low efficiency.
Innovation Solution
A cognitive radio communication terminal with a transmission processing unit that suspends initial data transmission during a randomly allocated quiet time slot and uses a sensing unit to determine feature information and energy in the channel, allowing for adaptive communication by resuming data transmission only when the channel is clear, employing either energy detection or feature detection schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a distributed communication protocol is adopted to simplify the system, then device complexity is reduced, but collision between terminals increases and transmission efficiency deteriorates
Solution Approach 1:
The patent implements preliminary collision detection by having terminals transmit feature information during a collision detection period before actual data transmission. The sensing unit detects features in advance, allowing terminals to suspend transmission during quiet time slots when collisions are detected, thereby preventing collisions without requiring complex centralized coordination
Solution Approach 2:
The patent introduces dynamic transmission suspension where terminals randomly select quiet time slots within a collision detection period to suspend data transmission. This dynamic approach allows the system to adapt to varying network conditions and collision patterns, maintaining high transmission efficiency while preventing collisions in a distributed environment
2Device complexity
If interference detection uses threshold-based power comparison, then detection simplicity is improved, but transmission efficiency is suppressed and synchronization requirements increase
Solution Approach 1:
The patent replaces traditional mechanical threshold-based power detection with feature detection mechanisms. The sensing unit detects specific feature information (preamble, pilot, signature, cyclic prefix) transmitted by other terminals, allowing more accurate collision detection without requiring complex synchronization or suppressing legitimate transmissions
Solution Approach 2:
The patent introduces feature information as an intermediary signal that carries collision detection capabilities. By detecting these feature information elements during quiet time slots, terminals can identify collisions without direct power threshold comparisons, eliminating the need for synchronization and reducing unnecessary transmission suppression
Data Source
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AI summary
A cognitive radio communication terminal including a transmission processing unit to divide data by a quiet time slot that is allocated at a first point in time of a collision detection period, to transmit at least one portion of the divided data to a reception side, and a sensing unit to determine whether at least one of a feature information and an energy of another terminal is detected in a channel with the reception side during the quiet time slot of the first point in time. Where neither the feature information nor the energy of the other terminal is detected based on a determination of the sensing unit, the transmission processing unit transmits the remaining divided data.