Short Range Radio Frequency Hopping Sequence Offset Control
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Solution Overview
Problem
In scatternet scenarios, unsynchronized piconet clocks and frequency hopping sequences lead to communication collisions, causing time and frequency conflicts that decrease data throughput, as existing solutions only address time conflicts ad-hoc and not frequency conflicts effectively.
Innovation Solution
A short range radio communication device with a processing circuit that determines a time offset between frequency hopping sequences to ensure non-overlapping segments, controlling the RF transceiver and clock circuit to operate on a shifted starting point, thereby avoiding frequency collisions by synchronizing the frequency hopping sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If piconet clocks operate independently without synchronization, then each piconet can operate autonomously, but frequency collisions and time conflicts occur between piconets
Solution Approach 1:
The patent applies parameter changes by adjusting the starting point of frequency hopping sequences based on piconet ID and clock offset. This modifies the frequency parameters dynamically to ensure non-overlapping frequency segments between different piconets, resolving the contradiction between autonomous operation and communication reliability.
2Adaptability or versatility
If frequency hopping sequences are not synchronized, then piconets maintain independence, but data throughput decreases due to frequency collisions
Solution Approach 1:
The patent segments the frequency hopping sequences into distinct non-overlapping frequency segments based on piconet ID. Each piconet operates in its own designated frequency segment, eliminating collisions while preserving independence. This segmentation approach maintains piconet autonomy while ensuring sufficient data throughput by preventing frequency conflicts.
3Ease of operation
If ad-hoc priority-based conflict resolution is used, then time conflicts can be addressed flexibly, but frequency conflicts remain unresolved and system complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and assigning non-overlapping frequency segments to different piconets before conflicts occur. The starting point of frequency hopping is determined in advance using piconet ID and clock offset, preventing both time and frequency conflicts systematically. This eliminates the need for complex ad-hoc conflict resolution mechanisms.
Data Source
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AI summary
A short range radio communication device and a method of controlling a short range radio communication device may include a processing circuit configured to: determine a time offset between an initial starting point of operation of a transceiver in accordance with a first frequency hopping sequence and a shifted starting point of operation of the transceiver in accordance with the first frequency hopping sequence so that a first segment of a frequency range is exclusive of a second segment of the frequency range; and control at least one of a controller and a clock circuit to operate the transceiver in accordance with the first frequency hopping sequence at the shifted starting point.