Vehicle Wireless Bandwidth Prioritization for Latency Critical Systems
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Solution Overview
Problem
In vehicle communication systems, high bandwidth consumption can lead to increased latency and latency spikes, which are critical in mission-critical communications like emergency stop systems.
Innovation Solution
A computer system that determines the state of latency critical systems in vehicles and limits the bandwidth of wireless communication links to prioritize communication with these critical systems, reserving bandwidth for them while limiting non-latency critical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bandwidth consumption is increased to support multiple systems, then productivity and data transfer capability are improved, but latency stability and reliability deteriorate due to congestion and latency spikes
Solution Approach 1:
The patent segments the wireless bandwidth into dedicated portions for latency-critical systems and non-latency-critical systems. The network interface device allocates specific time slots or frequency channels to different system types, ensuring that latency-critical communications (e.g., emergency stop signals) have guaranteed bandwidth without being affected by other data traffic.
Solution Approach 2:
The patent applies different quality of service (QoS) characteristics to different portions of the bandwidth. Latency-critical systems receive high-priority treatment with guaranteed minimum bandwidth and strict latency bounds, while non-critical systems use remaining bandwidth with best-effort service. This creates local quality differences within the overall network bandwidth.
2Reliability
If bandwidth is limited to ensure low latency, then latency stability is improved, but productivity and data transfer capability worsen due to restricted bandwidth availability
Solution Approach 1:
The patent implements dynamic bandwidth allocation where the network interface device continuously monitors network conditions and adjusts bandwidth allocation in real-time. When latency-critical systems are active, their bandwidth allocation is increased; when inactive, bandwidth is dynamically reassigned to other systems. This dynamic adjustment maintains latency stability while maximizing overall bandwidth utilization.
Solution Approach 2:
The patent ensures continuous useful action by maintaining a pool of reserved bandwidth that is always available to latency-critical systems when needed, while simultaneously utilizing the remaining bandwidth for non-critical data transfers. The system continuously monitors and reassigns bandwidth to maintain both low latency for critical systems and high overall utilization.
3Ease of operation
If multiple systems share the same bandwidth without prioritization, then ease of operation and system simplicity are improved, but reliability and latency performance worsen due to uncontrolled bandwidth consumption
Solution Approach 1:
The network interface device acts as an intermediary between multiple systems and the wireless network. It implements a bandwidth management module that automatically prioritizes traffic, allocates bandwidth, and controls data transmission without requiring individual systems to manage their own bandwidth. This intermediary approach maintains simplicity for end systems while ensuring reliable communication through centralized control.
Solution Approach 2:
The patent changes the parameter of bandwidth allocation from equal sharing to priority-based allocation. The system modifies transmission parameters such as data rate, time slot assignment, and frequency channel based on system priority and current network conditions. This parameter change enables reliable communication by ensuring critical systems receive sufficient bandwidth while maintaining manageable complexity through automated control.
Data Source
AI summary
A computer system for handling bandwidth of a wireless communication link for a vehicle is provided. The computer system comprises processing circuitry configured to determine which state a latency critical system of the vehicle is in, and to, when the latency critical system is determined to be in an active state, determine to limit a bandwidth of a wireless communication link between the vehicle and a wireless communication network such that at least a part of the limited bandwidth is reserved for the latency critical system in active state and a non-latency critical system is at least partly limited from consuming the limited bandwidth.