FQDN-Based Traffic Detection in 5G Core Networks
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Solution Overview
Problem
Current 5G core network systems face challenges in efficiently routing and managing traffic, particularly in cloud environments where server IP addresses frequently change, and existing policy and charging control (PCC) rules are complex and inefficient.
Innovation Solution
The introduction of an edge application server discovery function (EASDF) that utilizes fully qualified domain names (FQDNs) to handle DNS messages, enabling more efficient traffic detection, quality of service (QoS) application, and charging in edge computing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional IP-based PCC rules are used for traffic management, then routing control is established, but the system becomes complex and inefficient when server IP addresses frequently change in cloud environments
Solution Approach 1:
The patent introduces FQDN (Fully Qualified Domain Name) as an intermediary identifier between the client and the actual IP address. Instead of directly managing IP-based PCC rules that change frequently, the system uses FQDN as a stable intermediary that resolves to current IP addresses dynamically. This mediator approach allows traffic management to remain stable while adapting to IP changes in cloud environments.
Solution Approach 2:
The patent implements dynamic resolution of FQDN to IP addresses through DNS mechanisms. The system maintains dynamic adaptability by allowing the mapping between FQDN and IP addresses to change automatically as servers move or reconfigure. This dynamic resolution mechanism enables the network to adapt to IP address changes without requiring manual reconfiguration of PCC rules.
2Measurement precision
If DNS message handling is implemented for FQDN-based traffic detection, then traffic detection accuracy improves, but additional network nodes and processing complexity are introduced
Solution Approach 1:
The patent makes the DNS function multi-functional by having it serve both its traditional purpose of name resolution and the additional purpose of traffic identification and routing control. The DNS messages are used to carry not only domain name resolution information but also FQDN-based traffic detection and PCC rule delivery. This universal use of DNS reduces the need for separate dedicated traffic detection mechanisms.
Solution Approach 2:
The patent merges multiple functions into the DNS message handling process: name resolution, traffic detection, QoS parameter extraction, and PCC rule delivery are all combined into a single integrated mechanism. By merging these functions into the existing DNS infrastructure, the system avoids building separate complex systems for each function while achieving accurate FQDN-based traffic management.
3Measurement precision
If deep packet inspection is used for traffic identification, then application-level traffic can be detected, but processing power requirements increase significantly
Solution Approach 1:
The patent performs preliminary action by extracting and processing FQDN information at the DNS resolution stage, before the actual data traffic needs to be inspected. By resolving FQDN to IP addresses and establishing routing decisions in advance through DNS message handling, the system avoids the need for intensive deep packet inspection during data transmission. This preliminary processing significantly reduces ongoing processing power requirements.
Solution Approach 2:
Instead of performing expensive deep packet inspection on actual data traffic, the system uses DNS messages as a copy or representation of traffic identification needs. The DNS messages contain sufficient information (FQDN, QoS parameters) to identify traffic characteristics without inspecting the actual data payload. This copying approach provides accurate traffic identification with minimal processing power consumption.
Data Source
AI summary
The present disclosure relates to: a communication technique for a 5G communication system for supporting a higher data transmission rate higher a 4G system; and a system therefor. According to an embodiment of the present disclosure, a method for a first network node in a wireless communication system may be disclosed, the method comprising the steps of: receiving, from a second network node, a policy and charging control (PCC) rule and fully qualified domain name (FQDN)-based information that indicate any one of traffic detections via DNS message reporting or a DNS resolution; generating a DNS message processing rule on the basis of the FQDN-based information; transmitting the DNS message processing rule to a third network node; and receiving, from the third network node, an FQDN and an IP address for the FQDN, wherein the FQDN and the IP address are identified by the third network node via detection of a DNS response message on the basis of the DNS message processing rule.