5G Network Slice QoS Using L4S Feedback and Bandwidth Aggregation
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Solution Overview
Problem
Existing 5G networks face challenges in reliably maintaining high-priority applications and data traffic under limited capacity, particularly in scenarios where network performance degradation can lead to significant disruptions, such as in autonomous transportation or augmented reality systems.
Innovation Solution
Implementing a QoS system that combines Low Latency Low Loss Scalable Throughput (L4S) technology with bandwidth aggregation and network slicing to manage data packet throughput and adjust network connections dynamically, using Explicit Congestion Notifications (ECNs) to prevent performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network capacity is increased to handle high-priority applications, then service reliability is improved, but network infrastructure complexity and cost increase
Solution Approach 1:
The patent applies network slicing to divide the physical network into multiple virtual networks (slices), each dedicated to different service types or priority levels. This segmentation allows high-priority applications to be isolated in dedicated slices with guaranteed resources, improving reliability without requiring the entire network infrastructure to be oversized for peak demands of all applications simultaneously.
Solution Approach 2:
The patent introduces a QoS manager as an intermediary component that sits between the network infrastructure and applications. This QoS manager dynamically monitors network conditions and application requirements, making intelligent decisions about resource allocation, traffic routing, and priority management. This mediator enables reliable service delivery without requiring complex changes to the underlying network infrastructure.
2Reliability
If bandwidth is dynamically adjusted to prevent congestion, then packet loss is reduced, but network latency increases due to frequent adjustments
Solution Approach 1:
The patent implements resource reservation mechanisms where network parameters (bandwidth, priority levels, routing paths) are pre-configured and reserved for high-priority applications before actual data transmission begins. This preliminary setup ensures that when traffic needs to be handled, the necessary resources are already in place, eliminating the need for reactive bandwidth adjustments during transmission and thus preventing both packet loss and latency-induced delays.
Solution Approach 2:
The patent employs feedback mechanisms where the QoS manager continuously monitors network conditions and application performance metrics. Based on this feedback, the system dynamically adjusts resource allocation and traffic management strategies in real-time, optimizing the balance between preventing packet loss and minimizing latency by adapting to actual network state rather than using static or overly frequent adjustments.
3Adaptability or versatility
If multiple network slices are implemented for different applications, then service quality differentiation is improved, but device complexity increases
Solution Approach 1:
The patent introduces a QoS manager as an intermediary that handles the complexity of managing multiple network slices. This centralized or distributed QoS manager abstracts the slice management details from individual network devices and applications, providing a simplified interface for service quality differentiation. The QoS manager handles slice selection, resource allocation, and traffic routing decisions, thereby enabling versatile service quality differentiation without proportionally increasing device complexity at the network edge.
Data Source
AI summary
A 5G server system establishes a wireless connection between a wireless device and a data network (DN) subsystem through a network slice. A user plane function (UPF) subsystem generates an aggregated wireless connection between the UPF subsystem and the DN subsystem by augmenting the wireless connection with additional network connections. The DN subsystem and the UPF subsystem transmit data packets from a Low Latency Low Loss Scalable Throughput (L4S) application server to the wireless device via the aggregated wireless connection. In response to a detection of the risk of reduced service performance, the system adds a notification to a respective data packet. The system causes the wireless device to forward a feedback message to the L4S application server upon receiving the notification. The system performs an action to prevent reduced service performance in response to receiving a request from the L4S application server.