Beaconing Device for Secondary Wireless System Channel Detection
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Solution Overview
Problem
Secondary wireless systems face challenges in detecting primary wireless systems operating at lower power levels, leading to potential interference, especially in crowded communication bands, as their signals may not propagate far enough to be sensed by secondary devices, and beacon signals from multiple primary systems can collide or interfere with each other.
Innovation Solution
A system where a beaconing device associated with a primary wireless system transmits beacons over a greater range than the primary system, listens for beacons from other beaconing devices, and communicates this information to secondary wireless systems to avoid channel occupation by primary systems, using a coordinated beacon network to mitigate collisions and improve spectrum usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If primary wireless systems transmit at low power levels, then device complexity and energy consumption are reduced, but detection range is limited causing secondary systems to be unaware of channel occupation
Solution Approach 1:
A beacon transmitter is introduced as an intermediary device associated with the primary wireless system. This beacon transmitter operates at higher power levels than the primary system itself, extending the detection range while the primary system maintains its low-power operation. The beacon acts as a mediator that announces the presence and channel usage of the low-power primary system to secondary wireless systems over extended ranges.
2Loss of information
If multiple beaconing devices transmit beacons simultaneously, then information about channel occupation is provided, but beacon collisions and interference occur reducing reliability
Solution Approach 1:
Beacon transmissions are organized into periodic beacon periods with designated beacon slots. Each beaconing device is assigned specific time slots within these periodic cycles to transmit their beacons. This structured periodic approach ensures that multiple beacons are transmitted in an organized manner, preventing collisions while maintaining continuous information delivery about channel occupation status.
3Productivity
If secondary wireless systems operate in crowded unlicensed bands, then spectrum utilization is improved, but interference with primary systems increases
Solution Approach 1:
Secondary wireless systems continuously monitor and detect beacon transmissions from beaconing devices associated with primary systems. When beacons indicating primary system presence are detected, secondary systems receive feedback information about channel occupation and adjust their transmission behavior accordingly, vacating channels when primary systems are active. This feedback mechanism enables dynamic spectrum access that protects primary systems while allowing secondary systems to utilize available spectrum efficiently.
Data Source
AI summary
A system includes a first primary wireless system (120) that communicates over a first range, and a first beaconing device (130) associated with the first primary wireless system (120). The first beaconing device (130) communicates over at least at a second range, wherein the second range is greater than the first range. The first beaconing device listens for beacons (510) from other beaconing devices (130) associated with other primary wireless systems (120) on a plurality of channels over which the other primary systems may operate. After listening for beacons from the other beaconing devices (130) associated with other primary wireless systems, the first beaconing device transmits a first beacon (510) to a wireless device (114) of a secondary wireless system (110) that may communicate over the second range. The first beacon includes data indicating an occupation of a first one of the channels by the first primary wireless system (120).