Wireless CTS Frame Quiet Period Latency Reduction
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Solution Overview
Problem
Wireless network congestion impairs timely data delivery due to high channel utilization and retransmissions, particularly in environments with multiple devices transmitting data simultaneously, leading to increased latency and delayed data delivery.
Innovation Solution
The system employs a destination device to transmit a Clear to Send (CTS) frame without a preceding Request to Send (RTS) frame, creating a 'quiet period' for the source device to transmit data, and dynamically adjusts CTS frequency and duration based on network metric data and application requirements to minimize latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices transmit data simultaneously in wireless networks, then network utilization increases, but channel congestion and latency increase
Solution Approach 1:
The destination device transmits CTS frames at dynamically adjusted periodic intervals to create structured quiet periods. The CTS frequency is adapted based on network conditions and application requirements, establishing a periodic transmission pattern that ensures timely data delivery while optimizing channel utilization during congested wireless network environments
Solution Approach 2:
The system dynamically adjusts the CTS frame transmission frequency and quiet period duration based on real-time network metric data and application requirements. This dynamic adaptation allows the system to optimize the balance between network utilization and latency, adjusting parameters such as CTS interval and quiet period length to match changing network conditions and application needs
2Speed
If CTS frame transmission frequency is increased to reduce latency, then data delivery timeliness improves, but channel congestion increases
Solution Approach 1:
The destination device monitors network metric data including channel utilization and congestion levels, using this feedback to dynamically adjust CTS transmission frequency. When congestion is detected, the system reduces CTS frequency to alleviate channel load; when network conditions improve, frequency is increased to enhance data delivery speed, creating a closed-loop control system that balances speed and congestion
Solution Approach 2:
The system changes key parameters including CTS transmission frequency, quiet period duration, and CTS interval based on network conditions and application requirements. These parameter adjustments allow the system to optimize data delivery speed while preventing excessive channel congestion, adapting the transmission characteristics to match real-time network state
3Reliability
If CTS duration is extended to ensure complete data transmission, then data transfer reliability improves, but channel availability for other devices decreases
Solution Approach 1:
The quiet period duration is dynamically adjusted based on application requirements and data size. For time-sensitive applications with small data payloads, shorter quiet periods are used to maintain high channel utilization. For applications requiring complete data transfer, the quiet period is extended to ensure reliability, creating a dynamic balance between reliability and channel productivity
Data Source
AI summary
A group of computing devices use a wireless channel for communication, resulting in congestion. Within that group, some devices may need to exchange time sensitive application data, such as data indicative of control inputs received from a user. A destination device may transmit a clear to send (CTS) frame over the channel that indicates a CTS interval indicative of a time to suspend transmission. Other computing devices respond to the CTS frame by suspending transmission for the specified CTS interval. However, a source device in the group of many computing devices receives the CTS frame and initiates transmission of application data instead of suspending transmission. As a result, the source device transmits while other computing devices are not transmitting. In some implementations a beacon frame may be transmitted before a CTS frame. The destination device may confirm receipt of the application data by transmitting an acknowledgement to the source device.