Mobile Terminal DNS Address Update via Roundtrip Delay
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Solution Overview
Problem
Conventional mobile terminals face delays in internet services due to the need to access distant DNS servers when moving between networks, as they lack a method to update DNS addresses without additional messages in mobile IPv4 environments.
Innovation Solution
A method that samples and selects a DNS address with the minimum roundtrip delay by using a DHCP discovery message and ICMP messages to update the DNS address in a mobile terminal, ensuring efficient DNS service as the terminal moves between networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile terminal uses a fixed DNS address inputted by a user, then the terminal can access internet services, but the service is delayed when the terminal moves to remote networks due to the distance between the terminal and the DNS
Solution Approach 1:
The patent applies dynamics by making the DNS address dynamic rather than fixed. The mobile terminal automatically updates its DNS address based on current network location, switching from a static user-input DNS to a dynamic DNS selected from multiple available DNS servers. This resolves the contradiction by allowing the system to adapt DNS selection to the terminal's movement, maintaining reliability while reducing access delay.
Solution Approach 2:
The patent implements feedback mechanisms where the mobile terminal receives DNS address information from multiple sources (home agent, foreign agent, DHCP server) and continuously evaluates DNS accessibility. The terminal monitors DNS response and automatically selects the most accessible DNS server, creating a feedback loop that adjusts DNS configuration based on real-time network conditions and terminal location.
2Ease of operation
If the mobile terminal requests DNS address information during mobile IP registration, then the DNS address can be obtained automatically, but the standard mobile IP message format does not include an index for requesting DNS address
Solution Approach 1:
The patent applies universality by making the mobile terminal capable of receiving DNS address information through multiple different message types and sources. The terminal is designed to process DNS information from home agents, foreign agents, and DHCP servers using various message formats (Mobile IP registration messages, DHCP messages). This multi-functional capability allows automatic DNS acquisition without requiring changes to standard message formats, resolving the contradiction between ease of operation and device complexity.
3Loss of information
If additional messages are defined to provide DNS information to the mobile terminal, then the DNS address can be received, but an additional message for providing DNS information is required which increases system complexity
Solution Approach 1:
The patent makes existing message protocols multi-functional by enabling them to carry DNS address information in addition to their original purposes. The Mobile IP registration request and reply messages, as well as DHCP discovery and offer messages, are enhanced to include DNS address fields. This allows DNS information delivery using existing standardized messages rather than requiring new additional messages, resolving the contradiction between information delivery and protocol complexity.
Solution Approach 2:
The patent merges the DNS address delivery function with existing mobile IP and DHCP message exchanges. Instead of separate DNS provisioning messages, the DNS address information is combined with IP address allocation and network configuration messages. This consolidation delivers DNS information as part of the standard network setup process, eliminating the need for additional dedicated messages and reducing overall system complexity.
Data Source
AI summary
A method for updating a domain name server (DNS) address by obtaining the DNS address when an IP address is allocated by using a mobile IP address in a mobile terminal using the portable interne based on a wireless mobile network is provided. In the method at least one DNS address connected to the wireless mobile network is sampled (S400), a roundtrip delay to the respective sampled DNSs is calculated (S450), a DNS address having a minimum roundtrip delay is selected (S460), and a DNS address of the mobile terminal is updated to be the selected DNS address (S500).