DNS Server Priority Configuration for 5G Multi-Homed UEs
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Solution Overview
Problem
Current communication systems, particularly in 5G networks, face challenges in configuring the correct Domain Name System (DNS) server preferences for user equipment (UE) with multiple PDU Sessions, leading to ambiguity in selecting the appropriate DNS server for resolving domain names, especially in multi-homed environments where UE has multiple IP links with different DNS servers.
Innovation Solution
The proposed solution involves determining domain name system configuration information at a first core network entity, such as a Policy Control Function (PCF), based on the domains supported on the data network, and providing this information to a second core network entity, like a Session Management Function (SMF), which then sends it to the UE as policy information, including DNS server addresses with associated priorities, to guide the UE in selecting the appropriate DNS server for domain name resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DNS servers are provided to UE in multi-homed environments, then DNS server selection flexibility is improved, but DNS server selection ambiguity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority information for multiple DNS servers before the UE needs to select among them. The network entity determines and provides priority information indicating the order in which DNS servers should be selected, so when the UE encounters multiple DNS servers in a multi-homed environment, it can immediately apply the pre-established priority rules without ambiguity.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of priority information that mediates between the multiple DNS servers and the UE's selection process. This priority information acts as a mediator that translates the complex multi-homed network configuration into simple, unambiguous selection rules that the UE can follow, resolving the selection ambiguity while maintaining flexibility.
2Measurement precision
If DNS configuration is provided by network entity, then DNS server selection accuracy is improved, but network entity complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the DNS configuration function into distinct components: a network entity that determines priority information based on network configuration, and a UE that applies this priority information for DNS server selection. This segmentation allows the network entity to focus on providing accurate priority guidance without managing the entire DNS resolution process, reducing its complexity while maintaining selection accuracy.
3Productivity
If priority information is provided for DNS servers, then DNS resolution performance is improved, but information processing overhead increases
Solution Approach 1:
The patent applies parameter changes by transforming the DNS server selection problem from an unstructured choice among multiple servers into a structured decision based on priority parameters. By providing priority information as a key parameter, the system enables faster DNS resolution performance while keeping the additional information overhead minimal, as the priority data is compact and can be efficiently processed by the UE.
Data Source
AI summary
There is provided an apparatus, said apparatus comprising means for determining, at a first core network entity, an indication of domains supported on a data network, determining domain name system configuration information based at least on the indication of domains supported on the data network and providing the domain name system configuration information to a second core network entity.