Wake-up Packet Collision Detection Using OOK Periodic Intervals
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Solution Overview
Problem
In wireless communication systems, particularly those using contention-based mechanisms like IEEE 802.11, collisions during wake-up packet transmission are common, leading to inefficiencies and increased power consumption in battery-powered devices, as existing methods fail to detect collisions promptly and effectively mitigate their impact.
Innovation Solution
A system and method for detecting collisions by identifying specific time periods during which no energy is transmitted, using On-off-keying (OOK) modulated signals, and determining collisions based on energy detection during these periods, allowing for immediate action such as stopping or retransmitting the signal to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collision detection is performed continuously during transmission, then collision detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic collision detection by utilizing specific time periods within the OOK modulated signal where the transmitting device turns off its transmitter. During these periodic intervals, the device detects energy on the shared channel to check for collisions, rather than continuously monitoring. This periodic approach maintains collision detection reliability while significantly reducing power consumption by keeping the transmitter and receiver off during non-detection periods.
2Reliability
If the transmitter is turned off to detect energy during time periods, then collision detection capability is improved, but transmission continuity deteriorates
Solution Approach 1:
The patent incorporates collision detection intervals within the signal structure itself, specifically during designated time periods where no transmission energy is sent. By planning these detection intervals in advance as part of the signal format, the system maintains transmission continuity overall while enabling periodic collision detection. The transmitter turns off only during these pre-planned intervals, minimizing disruption to the overall transmission process.
3Reliability
If contention window size is increased to reduce collision probability, then collision probability is improved, but medium utilization deteriorates
Solution Approach 1:
The patent implements feedback-based collision detection by having the transmitting device monitor the shared channel for energy during specific time periods. When a collision is detected (energy level exceeds threshold), the device receives feedback about the collision and can adjust its transmission strategy accordingly. This feedback mechanism enables the system to operate with smaller contention windows while maintaining low collision rates, as devices can quickly respond to detected collisions and avoid repeated conflicts.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables timely detection and mitigation of collisions, reducing power consumption and interference, and improving the reliability of wake-up packet transmissions in battery-powered devices.
Implementation Method 1
detecting, by the TD, energy received on the shared channel during a portion of the time period
Data Source
AI summary
A method for collision detection by a transmission device (TD) includes identifying one or more time periods of a signal generated by the TD. The one or more time periods correspond to periods during which the TD will not transmit energy on a shared channel. The method includes transmitting a subset of the signal. While a current time is within one of the one or more time periods, the transmitting the subset of the signal includes turning off a transmitter of the TD at a beginning of the time period, detecting energy received on the shared channel during a portion of the time period, turning on the transmitter of the TD before an end of the time period, and determining that the detected energy meets a collision threshold. Based on the detected energy meeting the collision threshold, the method includes determining that there is a transmission collision.