DPI Node Traffic Shaping for xDSL Congestion
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Solution Overview
Problem
xDSL networks experience congestion and packet loss due to the lack of hierarchical scheduling, which results in downstream traffic exceeding the capabilities of access loops and network links, leading to suboptimal traffic management.
Innovation Solution
Implementing a DPI node that analyzes signaling from xDSL network access nodes and broadband network gateways to determine nodal and link capacities, enabling traffic shaping and congestion management by prioritizing traffic based on available capacities and characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hierarchical scheduling is implemented at BRAS/BNG, then traffic congestion and packet loss are reduced, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent introduces a DPI node as an intermediary component that performs deep packet inspection and traffic classification before traffic reaches the BRAS/BNG. This intermediary analyzes traffic patterns, identifies applications, and prepares traffic for hierarchical scheduling, thereby reducing the complexity burden on BRAS/BNG while improving traffic delivery reliability through proactive traffic management
Solution Approach 2:
The patent implements preliminary traffic classification and application identification at the DPI node before traffic enters the hierarchical scheduling system. By performing traffic analysis, classification, and marking in advance, the system reduces the complexity of real-time scheduling decisions at BRAS/BNG while ensuring more reliable traffic delivery through pre-processed traffic information
2Productivity
If downstream traffic is increased to meet user demand, then service quality improves, but congestion and packet loss occur when exceeding access loop capabilities
Solution Approach 1:
The patent implements dynamic traffic shaping at the DPI node that continuously monitors access loop capacity utilization and adjusts traffic rates in real-time. The system dynamically classifies traffic into different queues, applies variable rate limiting based on available capacity, and prioritizes delay-sensitive applications, thereby maintaining high throughput while preventing congestion-induced packet loss through adaptive rate control
Solution Approach 2:
The patent changes traffic management parameters by implementing application-aware traffic classification and prioritization. The system modifies traffic handling parameters such as queue weights, rate limits, and priority levels based on application type and current network conditions, enabling the system to maximize throughput for acceptable traffic while protecting packet delivery reliability for time-sensitive applications
Data Source
AI summary
Methods, systems, and computer readable media for DPI-enabled traffic shaping for xDSL networks are disclosed. According to one method, a DPI node analyzes signaling for an xDSL network access node or a broadband network gateway to determine nodal or link capacities available to nodes upstream from the network access node or the broadband network gateway for delivering downstream traffic to the network access device. The DPI node uses the determined capacities to shape downstream traffic delivered to the network access device.