Energy-Harvesting Tag Uplink Scheduling for Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, electronic tags face challenges with unscheduled transmissions leading to collisions and the near-far problem, where tags close to the energizer deplete resources and those far away have reduced transmission chances, due to the lack of unicast links and appropriate scheduling.
Innovation Solution
Implementing an energy harvesting tag random access and uplink scheduling algorithm that determines energy thresholds and power thresholds to delay or initiate transmissions based on location and performs clear channel assessment and random number generation to reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If tags perform unscheduled transmissions, then transmission simplicity is improved, but transmission collisions increase
Solution Approach 1:
The system performs clear channel assessment (CCA) before transmission to detect whether the channel is occupied. Tags check the channel status in advance and only transmit when the channel is clear, preventing collisions with ongoing transmissions from other tags or interferers.
Solution Approach 2:
The system implements dynamic backoff mechanisms where tags randomly select transmission delays based on collision history and channel conditions. This dynamic adjustment of transmission timing allows the system to adapt to varying traffic loads and collision patterns, reducing systematic collisions.
2Productivity
If tags close to the energizer transmit first, then their transmission success rate is improved, but resource depletion occurs and far tags have reduced transmission chances
Solution Approach 1:
The system implements location-aware transmission scheduling where tags adjust their transmission parameters based on their distance from the energizer. Near tags may use different power levels, timing offsets, or priority schemes compared to far tags, ensuring that neither group monopolizes the channel and both can transmit successfully.
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
Reduces transmission collisions and optimizes resource usage by ensuring tags transmit at optimal times, balancing energy harvesting and minimizing interference.
Implementation Method 1
cause energy from power from the one or more energizing signals to be stored by the first device
Data Source
AI summary
Systems and techniques are described for wireless communications. For example, a first device can receive one or more energizing signals from a second device. The first device can store energy from power from the one or more energizing signals. The first device can compare an amount of the energy being harvested to an energy threshold value. The first device can search for a wakeup signal within the one or more energizing signals based on determining the amount of the energy harvested is greater than the energy threshold value. The first device can compare an amount of power of the wakeup signal to a power threshold value based on detection of the wakeup signal. The first device can transmit, to the second device, a response signal based on determining the amount of power of the wakeup signal is less than the power threshold value.