Proxy Mobile IP Multicast Mobility Anchor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile communication networks face challenges in maintaining multicast service continuity during user mobility, particularly across different technologies and network types, leading to service interruptions and high latency in resuming multicast services after handover.
Innovation Solution
The implementation of a Proxy Mobile IP (PMIP) system with a dedicated multicast Local Mobility Anchor (LMA) and enhanced Multicast Listener Discovery (MLD)/Internet Group Management Protocol (IGMP) procedures to manage IP address assignments and trigger proxy binding updates, enabling seamless multicast mobility across different access technologies and networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing downlink only multicast networks are used, then multicast service can be provided within regional coverage, but wireless transmit receive unit loses access to multicast service when moving beyond coverage area
Solution Approach 1:
The patent introduces a mobility management entity and network-based mobility management mechanisms that act as intermediaries between the multicast service and mobile devices. These entities track device location and maintain multicast session continuity during handovers between different network coverage areas, allowing seamless mobility without losing service access.
Solution Approach 2:
The patent segments the multicast service delivery by introducing separate mobility management functions and anchor points. The mobility management entity separates the control plane (handling mobility signaling) from the user plane (handling multicast data), enabling independent optimization of each function and supporting cross-technology mobility through standardized interfaces.
2Adaptability or versatility
If existing bi-directional mobile communication networks are used, then inter-technology mobility is supported, but multicast services are not supported
Solution Approach 1:
The patent implements a universal mobility management framework that handles both unicast and multicast services through the same mobility management entity and signaling mechanisms. The system uses standardized Proxy Mobile IPv6 procedures that work across different radio access technologies (LTE, WiMAX, HSPA), providing inter-technology mobility while maintaining multicast service support through unified session management.
3Ease of operation
If hybrid networks with break-before-make service are used, then mobility is supported at application level, but long service interruptions occur
Solution Approach 1:
The patent implements seamless handover through preliminary actions including: pre-establishing bearer resources in the target network before handover, performing early synchronization procedures, and maintaining dual connectivity during transition. The mobility management entity proactively manages session continuity by maintaining anchor points and coordinating resource allocation across networks, eliminating service interruptions.
Solution Approach 2:
The patent ensures continuous multicast service delivery during handover by maintaining active bearers and data paths throughout the transition. The system uses make-before-break handover procedures where the target network is prepared in advance, and the mobile device maintains connections to both source and target networks simultaneously during the transition, ensuring uninterrupted service.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A method and an apparatus for a proxy mobile Internet protocol (PMIP) supporting a dedicated multicast local mobility anchor (LMA) and mobile access gateway (MAG) is provided. The LMA assigns an Internet Protocol (IP) address to a wireless transmit receive unit (WTRU) that processes the IP address and sends a router solicitation message to a serving MAG. A WTRU is disclosed to receive a first IP address that is for unicast service and a second IP address that is for multicast services. Generally, the method and apparatus proposes architecture, interfaces, and procedures to enable multicast mobility using Proxy Mobile IP. More specifically operations of aggregated PMIP tunnels for multicast services are described. Multicast mobility is enabled when mobile nodes move from one MAG to another MAG, intra-LMA, and inter-LMA. And, Multicast mobility is enabled between bidirectional network and downlink only multicast network in a hybrid network.