Gateway Device QoS Management for NAT-Obscured Data Streams
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Solution Overview
Problem
Current QoS management solutions in domestic networks are inadequate for efficiently delivering data streams due to bandwidth limitations, device diversity, and the obscuring effect of Network Address Translation (NAT), which hinders accurate identification of device characteristics and prioritization of data streams.
Innovation Solution
A system where a gateway device identifies and transmits device characteristics to a node entity in the public network, enabling Quality of Service management based on these characteristics, thereby allowing for effective prioritization and management of data streams even for devices behind a NAT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple data streams contend for bandwidth on the access link, then bandwidth utilization increases, but delivery reliability and quality of service deteriorate
Solution Approach 1:
The patent changes the parameter of bandwidth allocation by introducing per-flow bandwidth management. The gateway device dynamically adjusts bandwidth parameters for different data streams based on their priority and requirements, allowing high-priority streams to guarantee minimum bandwidth while lower-priority streams share remaining capacity. This resolves the contradiction by enabling efficient bandwidth utilization without sacrificing delivery reliability for critical flows.
Solution Approach 2:
The patent implements dynamic QoS parameter adjustment where bandwidth allocation, priority levels, and buffer management are continuously adapted based on real-time network conditions and flow characteristics. The gateway device dynamically modifies QoS parameters for active flows, allowing the system to respond to changing bandwidth demands and maintain both high utilization and reliable delivery under varying load conditions.
2Adaptability or versatility
If Network Address Translation (NAT) is used to manage device connections, then device connectivity is improved, but device identification accuracy and QoS management capability deteriorate
Solution Approach 1:
The patent introduces an intermediary mechanism where the gateway device acts as a mediator between the NAT layer and the QoS management layer. The gateway extracts device identification information from NAT-translated packets and enriches it with additional characteristics (device type, capabilities, QoS requirements) before passing this enhanced information to the QoS management system. This intermediary approach preserves both the connectivity benefits of NAT and the identification accuracy needed for effective QoS management.
Solution Approach 2:
The patent implements feedback mechanisms where the gateway device continuously monitors actual packet flows through NAT and uses this information to refine device identification and QoS parameter assignment. The system learns from observed traffic patterns and adjusts its understanding of device characteristics accordingly, improving identification accuracy over time while maintaining the connectivity advantages of NAT.
3Measurement precision
If device characteristics are collected and transmitted to the public network, then QoS management accuracy is improved, but network complexity and overhead increase
Solution Approach 1:
The patent extracts only the essential device characteristics needed for effective QoS management from the complete device profile. Rather than transmitting all possible device information, the system selectively extracts and transmits only the most relevant parameters (device type, QoS requirements, connectivity characteristics) to the public network. This extraction approach improves QoS management accuracy while minimizing the complexity and overhead of information exchange between private and public networks.
Data Source
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AI summary
A system for managing a data stream between first and second networks is described in which a node entity transmits a data stream addressed to a destination device in the second network and a gateway entity receives the data stream from the first network. The gateway entity identifies at least one characteristic of the destination device and transmits it to the node entity in the first network in such a way that the characteristic is relatable to the data stream. The node entity receives the characteristic of the destination device from the gateway entity and relates it to the data stream and performs Quality of Service management on the data stream based on the at least one characteristic. A gateway device and a method of managing a data stream are also described. The system, gateway, node and method extend the application of QoS performance and management.