Network-Based Mobile Multicast Tunneling for Mobility Management
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Solution Overview
Problem
Current mobile multicast systems, particularly those using Proxy Mobile IP (PMIP), face challenges in providing efficient multicast services without additional functionality on mobile nodes, managing signaling load, and optimizing network bandwidth, especially in environments with high mobility and limited bandwidth.
Innovation Solution
A network-based mobile multicast system that includes a mobility control server, managers, access points, and a router, which manages mobility and forms tunnels between mobile nodes and managers to deliver multicast data efficiently, reducing signaling load and optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile nodes implement MIP function to support mobility, then mobility support capability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a network-based mobility management mechanism where the network infrastructure (gateway, mobility manager) acts as an intermediary to handle mobility signaling and tunnel management. This allows mobile nodes to receive multicast services during handovers without implementing complex MIP functions, as the network infrastructure manages the mobility state and tunnel establishment on behalf of the mobile nodes.
2Device complexity
If PMIP scheme is used to simplify mobile node structure, then device complexity is reduced, but multicast service support capability deteriorates
Solution Approach 1:
The patent segments the multicast service support functionality into two parts: (1) basic PMIP mobility management handled by the network infrastructure, and (2) multicast-specific management handled by the mobility manager and gateway. This segmentation allows mobile nodes to remain simple while the network infrastructure provides comprehensive multicast support through specialized components.
Solution Approach 2:
The mobility manager acts as an intermediary that coordinates between the gateway and mobile nodes to manage multicast group membership and tunnel establishment. This intermediary mechanism enables PMIP-based mobile nodes to receive multicast services without implementing complex multicast protocols, as the mobility manager handles the coordination.
3Reliability
If traditional multicast routing is used in mobile networks, then multicast service delivery is improved, but signaling load on network increases
Solution Approach 1:
The patent merges mobility management and multicast service management into a unified framework. The mobility manager handles both mobility signaling and multicast group management, while the gateway manages both unicast and multicast tunnel establishment. This merging reduces redundant signaling by coordinating both functions through the same infrastructure components.
Solution Approach 2:
The patent establishes multicast tunnels and group membership in advance during the initial attachment and handover processes. By pre-configuring the multicast delivery path through the gateway and mobility manager before actual multicast data transmission begins, the system reduces signaling overhead during active multicast service delivery.
4Reliability
If network bandwidth is allocated for multicast services in mobile environments, then service delivery quality is improved, but bandwidth efficiency deteriorates due to high mobility
Solution Approach 1:
The patent implements dynamic tunnel management where the gateway and mobility manager adjust multicast tunnel establishment and maintenance based on real-time mobile node mobility state. Tunnels are dynamically created, modified, or torn down according to handover events and multicast group membership changes, optimizing bandwidth utilization while maintaining service quality for mobile receivers.
Data Source
AI summary
A method includes transferring a general query message to managers of a mobility control server in response to receiving, from a router, the general query message for detecting a mobile node that requested to receive multicast data; storing, in a multicast mapping table, an address of the mobile node that requested to receive the multicast data when a membership report message of the mobile node is received from at least one of the managers and transferring the membership report message to the router; and forming a tunnel between the router and a manager that transfers the membership report message.