compliance for high priority messages while low-
priority traffic transmission is also guaranteed at low
delays. This scalable and efficient solution meets the
communication requirements of autonomous vehicle
networks, enabling reliable data exchange for both
critical safety applications and non-critical services.
The model serves as a solid foundation for upholding
both the safety and operational efficacy of AVs
functioning in dynamic and congested network
surrounding.
Traffic Shaping Mechanism Overview: Traffic
shaping is a mechanism to adjust the transmission of
packets to a narrower bandwidth in order to constrain
it below the full rate to avoid congestion in networks
in order to implement Data flow management.
Conventional networking systems utilize queuing
techniques like First-Come-First-Served (FCFS),
Priority Queuing (PQ), as well as Weighted Fair
Queuing (WFQ) when it comes to packet
prioritization. Whilst these approaches perform well
in many contexts, they often struggle to satisfy the
strict latency requirements of autonomous vehicle
networks, particularly at high traffic loads, or, in
scenarios when multiple vehicles are communicating
simultaneously.
To overcome these limitations, we present an
adaptive queuing model that enables packets to be
classified as either high-priority or low-priority and
subsequently scheduled for transmission. This
approach aims to deliver the high-priority packets as
quickly as possible while avoiding the situation where
low-priority packets are delayed too long in high-
traffic situations. This is done by adapting to the
variations in the network conditions (packet arrival
rate, vehicle density, communication latency, etc.)
dynamically to sustain its efficiency in results. This
adaptive scheme aims to provide a flexible approach
to support safety-critical as well as non-critical
applications, enabling robust communication in
realistic autonomous vehicle networks.
Priority Queuing and Adaptive Scheduling: From
here, we can naturally build the proposed mechanism
of traffic shaping based on Priority Queuing (PQ),
which involves ordering packets into queues
depending on their priority. This helps to make sure
that critical data packets are processed and
transmitted before less crucial data packets are.
Leverage two high-level queues.
High-Priority Queue: This queue handles safety-
critical and time-sensitive messages, including
commands to initiate emergency braking, collision
notifications, and other real-time safety messages that
have to be processed quickly. But they need the
lowest possible latency to deliver information for
timely response where any delay can affect safety.
Low-Priority Queue: This queue processes low-
priority messages like navigation updates, weather
data or infotainment content. Although these packets
have to be sent, they can survive higher latencies
compared to high-priority traffic. That means only
the most important packets are processed first.
It only starts processing packets from the low-
priority queue when the high-priority queue is
empty. This also guarantees that safety-critical data
always receives the required bandwidth, no matter
how network traffic develops. Moreover, as the main
design goal of the protocol is to avoid starvation of
low priority traffic, the protocol includes an adaptive
scheduling component that adjusts the transmission
rate depending on the size of the queue and the state
of the traffic in the network. This allows both queues
to be processed very efficiently, especially during
peak loads.
Adaptive Queue Management: The proposed
method's respect for dynamic systems through
adaptivity makes it effective in time-varying
scenarios. Conventional static prioritization
approaches are often inadequate for addressing the
dynamic nature of the environment in autonomous
vehicle (AV) networks. We assume that the system is
capable of monitoring system factors such as traffic
density, packet arrival rates, and communication
delays, and dynamically adjusting its behavior based
on these inputs.
Just as the high-priority queue handles bursty
traffic, in a situation where the high-priority queue
becomes congested, the system reduces the
transmission rate of low-priority packets to set aside
additional resources for mission-critical traffic. In the
case of low-high priority traffic, the system rather
boosts the bandwidth of low-priority packets in order
to get the right ratio in both queues.
To enable this adaptability, we then employ a
Dynamic Time Slot Allocation (DTSA) mechanism.
It dynamically allocates time slots for transmission
based on the traffic load of each queue. By keeping
also some excess time slots reserved to send the
packets coming from the High-Priority queue in case
that that gets full, thus, significantly reducing the
chances of delays and/or packet loss. The lower
priority queue though, as that fills up, as those
packets are using longer time slots to be processed,
balances the load across both queues. It also takes
into consideration queue length and packet arrival
rates before making any adjustments. If packets are
fed continuously into a high-priority queue at a