Radio Communication Apparatus Frequency Hopping Interference Avoidance
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Solution Overview
Problem
Existing radio communication systems face challenges in achieving high reliability in environments with multiple interference sources, particularly in the ISM band where systems like wireless LANs can cause significant interference, making it difficult to maintain reliable communication.
Innovation Solution
A radio communication apparatus that employs frequency hopping, carrier sense units, interference-avoidance-timing control, and successive transmission to allocate different communication time periods for each communication partner, ensuring data is transmitted on different frequency channels to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping and carrier sense are used to avoid interference, then interference resistance is improved, but communication time is increased due to multiple transmission attempts
Solution Approach 1:
The system performs carrier sense detection before transmission to preliminarily identify interference conditions. By detecting the carrier signal in advance and selecting appropriate frequency channels based on the detection result, the system avoids unnecessary transmissions on interfered channels, thereby reducing overall communication time while maintaining interference resistance.
Solution Approach 2:
The system dynamically adjusts transmission parameters including frequency channel selection and transmission timing based on real-time interference detection. The hopping control unit changes frequency channels dynamically, and the interference-avoidance-timing control unit adjusts transmission timing based on carrier sense results, allowing the system to adapt to changing interference conditions and optimize communication efficiency.
2Reliability
If successive transmission of same data multiple times is implemented, then reliability is improved, but data transmission efficiency is reduced
Solution Approach 1:
The system transmits multiple copies of the same data through successive transmissions on different frequency channels. By creating redundant copies and transmitting them through different frequency paths, the system ensures that at least one copy reaches the destination successfully, improving reliability while the diversity of transmission paths maintains overall efficiency.
Solution Approach 2:
The system changes transmission parameters including frequency channel and transmission timing across successive transmissions. The hopping control unit varies the frequency channel for each transmission attempt, and the interference-avoidance-timing control unit adjusts timing parameters, allowing the system to bypass interfered channels and maintain effective data transmission efficiency while ensuring reliability through multiple attempts.
3Reliability
If multiple frequency channels are used for frequency hopping, then interference avoidance performance is improved, but system complexity is increased
Solution Approach 1:
The system segments the frequency spectrum into multiple discrete frequency channels that can be independently selected and controlled. By dividing the available spectrum into distinct hopping channels, the system achieves diverse frequency paths for interference avoidance while managing complexity through structured channel organization and predefined hopping sequences.
Solution Approach 2:
The system implements periodic frequency hopping according to a predetermined sequence and timing pattern. The hopping control unit follows a structured periodic pattern for channel switching, and the interference-avoidance-timing control unit applies regular timing intervals for carrier sense and transmission attempts, reducing complexity through predictable periodic behavior while maintaining interference avoidance performance.
Data Source
AI summary
A radio communication apparatus includes a FH control unit controlling frequency hopping for changing a frequency channel for each frame, a carrier sense unit performing carrier sense, for each of slots obtained by dividing the frame, a modulating unit determining transmission timing in the slot on the basis of a result of the carrier sense, a successive-transmission control unit generating a plurality of pieces of same data by duplicating transmission data, and a scheduler allocating, for each slot, a different communication time period to each mobile station. The radio communication apparatus transmits, on the basis of an allocation result of the communication time period, the transmission timing, and the instruction by the hopping control unit, the same data generated from same transmission data to the mobile stations in the frames different from each other and notifies the mobile stations of the allocation result.