Multi-mode Terminal Fast Handover Heterogeneous Networks
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Solution Overview
Problem
Existing mobile data communication systems face challenges in providing seamless and quick handover between heterogeneous networks, as they require changes in network layers and lack efficient methods to select optimal networks based on latency and bandwidth.
Innovation Solution
The implementation of a multi-mobile terminal (MMT) with multiple interfaces that can transmit Binding Update messages containing path latency and bandwidth information, allowing a home agent to select the optimal network and enabling the MMT to switch between heterogeneous networks like WiBro and WLAN efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile station performs handover between heterogeneous networks, then network connectivity is maintained, but handover time increases and seamless communication is disrupted due to network layer changes
Solution Approach 1:
The patent applies preliminary action by having the mobile station transmit Binding Update messages to multiple home agents in advance before actual handover is needed. The mobile station evaluates path latency and bandwidth information for multiple heterogeneous networks ahead of time, so when handover becomes necessary, the optimal network can be selected immediately without delay, thus reducing handover time and improving seamlessity.
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting different networks based on measurable parameters such as path latency and available bandwidth. The mobile station monitors these parameters in real-time and switches between heterogeneous networks (e.g., WiBro, WLAN, 3G) depending on which network currently offers the best performance, enabling adaptive and seamless handover.
2Reliability
If a mobile station monitors multiple heterogeneous networks for optimal selection, then network performance improves, but device complexity increases due to multiple interfaces and evaluation mechanisms
Solution Approach 1:
The patent applies universality by designing a multi-functional mobile station that can operate across multiple heterogeneous networks using a unified set of protocols and management mechanisms. The same Binding Update message format and path evaluation logic are used for all network types (WiBro, WLAN, 3G), allowing the device to manage diverse networks through a common framework rather than requiring separate specialized systems for each network type.
Solution Approach 2:
The patent employs copying by having the mobile station create and transmit multiple Binding Update messages simultaneously to different home agents, each containing information about a specific network path. This allows the system to evaluate multiple network options in parallel without requiring complex sequential analysis, reducing the processing burden while maintaining comprehensive network monitoring.
3Measurement precision
If routers update path latency and bandwidth information in BID sub-option extension, then path selection accuracy improves, but message size and processing overhead increase
Solution Approach 1:
The patent applies local quality by including path latency and bandwidth information only in the BID sub-option extension when and where it is actually needed for handover decisions. The information is selectively updated and transmitted only for paths that require evaluation, rather than attaching comprehensive path data to all routing messages, thus maintaining measurement precision while minimizing unnecessary data transmission.
Solution Approach 2:
The patent utilizes partial action by incorporating only the essential path information (latency and bandwidth) into the BID sub-option extension, omitting less critical routing details. This selective inclusion provides sufficient accuracy for network selection decisions while keeping the message size manageable and avoiding excessive processing overhead.
Data Source
AI summary
A multi-mode terminal (MMT) including a plurality of interfaces which provides access capability to heterogeneous networks respectively to provide quick handover between the heterogeneous networks, is provided. In this instance, when a Binding Update (BU) message is transmitted to a home agent via each of the plurality of interfaces, routers existing in a path to the home agent may update path latency information and path bandwidth information as a Binding Unique Identifier (BID) sub-option extension of Mobile Nodes and Multiple Interfaces in Internet Protocol version 6 (MONAMI6). In this case, the home agent may receive the BU message and select a care-of address (CoA) by referring to path latency information and path bandwidth information, included in the BU message. Also, the home agent may transmit a success binding acknowledgement (BAck) message with respect to the BU message of the selected path.