Dynamic Access Mode Control for Shared Band Collision Avoidance
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Solution Overview
Problem
The increasing demand for high-speed communication services has led to a scarcity of radio resources, necessitating more efficient use of frequency resources, particularly in unlicensed and shared bands, where cognitive radio technology is applied, but existing solutions struggle to optimize access modes to prevent collisions and maximize resource usage efficiently.
Innovation Solution
An apparatus and method that dynamically determine an access mode between contention access and contention-free access modes based on the usage rate of unlicensed or shared bands, using a band recognition unit to assess the usage rate and a mode determination unit to select the appropriate access mode, which can also adjust the length of access slots to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cognitive radio technology is applied to unlicensed or shared bands, then radio resource usage efficiency is improved, but collisions with primary systems and interference between secondary systems occur
Solution Approach 1:
The patent implements dynamic access mode selection that adapts to changing band usage conditions. The system transitions between contention-based and contention-free access modes based on real-time recognition of band usage rates, allowing flexible adaptation to prevent collisions while maximizing resource utilization in unlicensed and shared bands
Solution Approach 2:
The system changes the access mode parameter based on band usage conditions. When usage rate exceeds a threshold, the system switches from contention-based to contention-free access mode, fundamentally changing the access behavior to avoid collisions while maintaining high resource efficiency
2Reliability
If contention-free access mode is used, then collision prevention is improved, but radio resource usage efficiency deteriorates due to reserved slots
Solution Approach 1:
The system dynamically selects between contention-free and contention-based access modes based on real-time band usage rate recognition. When usage rate is below the threshold, contention-based mode is used for high efficiency; when usage rate exceeds the threshold, contention-free mode is activated for collision prevention, optimizing both reliability and productivity
3Productivity
If band usage rate increases, then more communication systems can share the band, but collision probability increases
Solution Approach 1:
The system continuously monitors and recognizes the usage rate of the unlicensed or shared band, using this feedback information to dynamically adjust the access mode. When usage rate increases beyond a threshold, the system switches to contention-free access mode, which provides reserved slots that eliminate collisions, thus maintaining reliability while supporting high band sharing capacity
Data Source
AI summary
A technology that can adaptively control an access mode according to a shared band or an unlicensed band used by an adjacent communication system. An access mode controlling apparatus includes a band recognition unit to recognize a usage rate of an unlicensed band or a shared band that is used by an adjacent communication system of a target communication system; a mode determination unit to determine, as an access mode, any one of a contention access mode and a contention-free access mode, based on the usage rate of the unlicensed band or the shared band; and an information transmitter to transmit mode information associated with the determined access mode to member nodes or a base station of the target communication system.