Relay Gateway Inter-Domain Handover IP Translation
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Solution Overview
Problem
Conventional handover methods for mobile devices face challenges in ensuring seamless information transmission due to the 'triangle routing problem' during inter-domain handovers, where IP address updates are not efficiently managed, leading to potential packet loss and disruptions.
Innovation Solution
An inter-domain handover system and method where relay gateway devices exchange and compare complex information, including identification codes and IP addresses, to update lists and modify packet destinations, ensuring seamless transmission by replacing former IP addresses with current ones, thereby facilitating smooth handovers between relay gateway devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device sends a request to the base station to update the IP address list, then the mobile device can transmit data to other electronic devices, but the triangle routing problem occurs causing packet loss and transmission disruptions
Solution Approach 1:
The patent introduces a relay gateway device as an intermediary between mobile devices during handover. The relay gateway device receives packets destined for the mobile device, performs IP address translation from the former IP address to the current IP address, and forwards the translated packets to the mobile device's new location. This intermediary mechanism resolves the triangle routing problem by eliminating the need for direct routing updates between base stations and the mobile device, thereby improving transmission reliability while managing routing complexity centrally at the gateway level.
2Reliability
If the relay gateway device compares received complex information with stored complex information, then the packet can be transmitted to the destination mobile device, but the device complexity increases
Solution Approach 1:
The relay gateway device performs preliminary actions by maintaining a mapping table that stores the correspondence between mobile devices' identification codes, former IP addresses, and current IP addresses before handover completion. When a packet arrives, the gateway device quickly consults this pre-established mapping table to perform IP address translation. This preliminary preparation of mapping information reduces the complexity of real-time decision-making during handover, enabling seamless transmission without requiring complex runtime comparisons and calculations.
Data Source
AI summary
A relay gateway device includes a processor and a storage, in which when a packet transmission is performed between a first mobile device and a second mobile device and the second mobile device switches from the relay gateway device to another, the IP address of the second mobile device changes from a former IP address to a current IP address. When the first mobile device transmits a first packet to the second mobile device in which the destination address of the first packet is the former IP address, the processor of the relay gateway device modifies the destination address of the first packet into the current IP address according to the former IP address and the current IP address of the second mobile device in a list of the storage and then transmits the first packet to the second mobile device, thereby achieving a seamless transmission during handover.