Mapping Server Notification for Locator Information in IP Networks
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Solution Overview
Problem
In IP networks, the waiting time to acquire locator information of a transfer node for communication destinations can lead to packet loss, delay, and increased costs due to inefficient routing and caching in scenarios with multiple moving terminals.
Innovation Solution
A notification apparatus that stores terminal identifiers and locator information for candidate communication destinations, allowing for pre-acquisition and notification of this information to reduce the waiting time for locator information at the start of communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the xTR inquires of the mapping server about locator information at the start of communication, then the locator information can be acquired, but a waiting time occurs and communication cannot start immediately
Solution Approach 1:
The mapping server performs preliminary action by notifying the xTR of locator information for candidate terminals in advance, before actual communication begins. This allows the xTR to have locator information ready when communication is initiated, eliminating the waiting time that would otherwise occur during the inquiry process.
Solution Approach 2:
The system cushions against the potential delay by pre-fetching and storing locator information for candidate terminals. This beforehand cushioning ensures that when communication needs to start, the locator information is already available, preventing communication delays and packet loss.
2Loss of time
If the xTR stores packets in cache while waiting for locator information, then communication can resume after acquisition, but apparatus cost increases
Solution Approach 1:
Instead of caching packets and waiting, the system performs preliminary action by acquiring and storing locator information in advance. This eliminates the need for packet caching infrastructure, reducing apparatus cost while still preventing communication interruptions.
Solution Approach 2:
The invention extracts the locator information acquisition step from the packet transmission path. By separating the locator information notification from the packet forwarding process, the system eliminates the need for costly packet caching mechanisms while maintaining communication continuity.
3Reliability
If routing is performed whenever the terminal moves in a network with many terminals, then the terminal can maintain connectivity, but network efficiency decreases
Solution Approach 1:
The system applies local quality by providing customized locator information notifications to specific xTRs based on their candidate terminals, rather than performing global routing updates. This localized approach maintains terminal connectivity while avoiding unnecessary network-wide routing operations, improving overall network efficiency.
Solution Approach 2:
The mapping server acts as an intermediary that manages locator information distribution. It mediates between terminal movement and xTR routing decisions, providing targeted notifications only when necessary. This intermediary role maintains connectivity reliability while preventing inefficient full-network routing updates.
Data Source
AI summary
A storage unit (14) stores a terminal identifier for identifying a terminal, locator information indicating a transfer node to which a terminal is connected, a candidate terminal identifier for identifying a candidate terminal that is a communication destination candidate of the terminal, and candidate locator information indicating a transfer node to which the candidate terminal is connected in association with each other. An acquisition unit (15a) acquires, from a transfer node to which a terminal is newly connected, mapping information in which a locator information indicating the transfer node and a terminal identifier of the terminal are associated and stores the mapping information in the storage unit (14). A notification unit (15b) notifies the transfer node to which the terminal is newly connected of the candidate terminal identifier and the candidate locator information stored in association with the terminal identifier that is acquired in the storage unit (14).