Carrier Sensing Timing Adjustment for TSCH Synchronization
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Solution Overview
Problem
Conventional wireless communication techniques, such as TSCH, face accuracy issues in time synchronization due to shifting packet transmission times caused by changing carrier-sensing start timings, leading to potential wave collisions and reduced synchronization accuracy.
Innovation Solution
A communication device and method that adjusts the end timing of carrier-sensing in a time slot, allowing for accurate time synchronization by including timing information in data packets and modifying carrier-sensing times based on priority and collision likelihood, thereby maintaining effective communication and synchronization across a multi-hop network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier-sensing start timing is changed to make carrier-sensing effective, then carrier-sensing effectiveness is improved, but packet transmission time is shifted which reduces time synchronization accuracy
Solution Approach 1:
The patent applies dynamics by making the carrier-sensing timing adjustable rather than fixed. The carrier-sensing start timing is dynamically changed based on collision likelihood predictions, allowing the system to adapt to different communication conditions while maintaining both carrier-sensing effectiveness and time synchronization accuracy through controlled flexibility
Solution Approach 2:
The patent implements feedback by using collision likelihood information to adjust carrier-sensing timing. The system predicts collision probability and uses this feedback to determine when to start carrier-sensing, creating a closed-loop control that balances carrier-sensing effectiveness with maintaining accurate packet transmission times for synchronization
2Object-affected harmful factors
If packet transmission time is shifted to avoid wave collisions, then wave collision is reduced, but time synchronization accuracy is reduced
Solution Approach 1:
The patent applies preliminary action by predicting collision likelihood before actual transmission occurs. The system evaluates potential collisions in advance and preemptively adjusts carrier-sensing timing to prevent waves from colliding, rather than reacting after collisions occur, thereby avoiding transmission time shifts that would affect synchronization
Data Source
AI summary
A communication device of an embodiment includes one or more processors. The processors synchronize time between the communication device and a different communication device using data transmitted and received by time division multiple access. The processors determine the end timing of carrier-sensing in a time slot of the time division multiple access. The processors control carrier-sensing to end at a determined end timing. The processors generate data including timing information, allowing identification of the determined end timing, as data to be transmitted to the different communication device.