Wireless Sensor Latency Reduction via Time Slot Segmentation
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Solution Overview
Problem
Current wireless sensor systems in discrete event control applications face challenges with high latency and communication errors during sensor bursts, which can lead to system failures and significant production downtime, especially in manufacturing and vehicle control systems where real-time communication is critical.
Innovation Solution
A method utilizing transmission pipelining in wireless medium access protocols, allowing multiple sensors to transmit data packets simultaneously over different channels, with acknowledgement-based retransmissions to ensure reliable delivery within tight latency deadlines, and employing multiple receivers to manage bandwidth bottlenecks during sensor bursts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless sensors are used to simplify mechanical design and eliminate cable wear, then ease of manufacture and reliability are improved, but latency and communication errors increase during sensor bursts
Solution Approach 1:
The patent segments the communication channel into multiple time slots and frequency channels, allowing sensors to transmit data packets in an organized manner. This segmentation prevents collisions during sensor bursts by assigning specific transmission opportunities to different sensors, thereby reducing latency while maintaining reliability.
Solution Approach 2:
The patent implements periodic transmission slots where sensors can transmit data at scheduled intervals. This periodic structure ensures that even during high-traffic bursts, sensors have guaranteed transmission opportunities, preventing data loss and reducing overall latency by avoiding random backoff delays.
2Productivity
If multiple sensors transmit simultaneously during bursts, then productivity is improved, but communication errors and message loss increase
Solution Approach 1:
The patent introduces an additional dimension for communication by using both time slots and frequency channels. This two-dimensional resource allocation allows multiple sensors to transmit simultaneously in different frequency channels during bursts, maintaining high productivity while preventing communication errors through orthogonal separation.
3Loss of time
If traditional medium access protocols are used, then device complexity is reduced, but latency deadlines cannot be met during sensor bursts
Solution Approach 1:
The patent performs preliminary actions by pre-allocating time slots and frequency channels to sensors before transmission bursts occur. This advance planning ensures that during sensor bursts, latency deadlines are met because transmission resources are already reserved, without requiring complex real-time arbitration protocols.
4Ease of operation
If sensors transmit at random times, then ease of operation is improved, but traffic bursts cause message loss and system failures
Solution Approach 1:
The patent creates a universal transmission framework that works for both low-traffic and high-traffic conditions. The same time-slot and frequency-channel allocation mechanism serves as the primary transmission method, eliminating the need for separate random access protocols while maintaining ease of operation and preventing message loss during bursts.
Data Source
AI summary
A wireless data transmission method includes providing a plurality of radio frequency transmitters. A receiver is provided to receive transmissions from the transmitters. A data format including a plurality of transmission time slots is defined. Each of the transmitters is caused to independently select one of the time slots. The transmitters are used to transmit the transmissions to the receiver in the independently selected time slots.