Multicast Broadcasting for Roaming Mobile Terminals in IP Networks
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Solution Overview
Problem
Current multicast communication technologies, such as NEMO technology, fail to optimize private multicast communications within mobile IP networks, leading to inefficient use of multicast communication trees and limitations in accessing local broadcasts for mobile terminals, especially when they move between different sites within a home organization.
Innovation Solution
A method is implemented where a mobile router connected to a mobile IP network discriminates its location relative to its home site and organization, substitutes access requests for local multicast communications, and transforms extended multicast communications into local transformed communications for seamless access to broadcasts, enabling efficient access to local multicast communications across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NEMO technology is used to handle mobile IP network access, then mobile terminals can maintain communication during movement, but multicast communication efficiency deteriorates due to lack of optimization for private broadcasts
Solution Approach 1:
The patent segments multicast communication into two distinct types: global multicast communication for public IP network broadcasts, and local multicast communication for private home organization broadcasts. This segmentation allows each type to be handled by optimized protocols, with local multicast being efficiently delivered only to authorized terminals within the home organization regardless of their current network attachment point.
Solution Approach 2:
The patent introduces a home agent as an intermediary component that receives multicast group membership information from mobile terminals and manages local multicast distribution. This home agent acts as a mediator between the mobile terminal and local multicast sources, enabling efficient delivery of private broadcasts without requiring the terminal to be physically present at the home site.
2Ease of operation
If mobile terminals access local broadcasts from their home site while connected to foreign sites, then access restrictions are violated, but allowing such access improves user convenience
Solution Approach 1:
The patent implements dynamic access control for local multicast communication based on the terminal's current network location and membership status. The system dynamically determines whether a terminal should receive local broadcasts by checking its home organization membership and current attachment point, allowing flexible access that adapts to changing network conditions while maintaining security.
Solution Approach 2:
The patent changes the parameter of access control from static (based solely on physical location) to dynamic (based on network membership and location). By modifying how access rights are determined - using home organization membership information and current network attachment point - the system enables convenient access for authorized users while maintaining restriction enforcement.
3Area of stationary object
If multicast communication is optimized for global broadcasts, then public network coverage is improved, but local private broadcast efficiency deteriorates
Solution Approach 1:
The patent segments multicast communication into global and local components, allowing each to be optimized independently. Global multicast handles public IP network broadcasts with wide coverage, while local multicast optimizes private home organization broadcasts for efficiency. This segmentation resolves the contradiction by enabling both wide coverage and high efficiency in their respective domains.
Solution Approach 2:
The patent applies local quality optimization by creating a dedicated local multicast communication mechanism for home organization broadcasts. Instead of using the generic global multicast protocol for all broadcasts, the system implements location-aware local multicast delivery that adapts to the specific requirements of private broadcasts, improving efficiency for local traffic while maintaining global coverage capabilities.
Data Source
AI summary
A system for multicast broadcasting towards an IP network mobile system. Upon connection of the mobile router and transmission of a signalling to the site of origin, the method includes discriminating the location of a mobile router with regard to the respective site of the organization of origin; transmitting to an infinity of locations; then for each assess request of a mobile terminal, local multicast broadcasting; substituting the access request, if the location information designates a connection of outside the respective site thereof coming from the organization of origin, with a request for access to extend multicast broadcasting; transmitting the request for access to extend multicast broadcasting; receiving and transforming, at level, the extended multicast broadcast into local transformed multicast broadcast and transmitting the locally transformed multicast broadcast on the IP mobile network to the requesting user terminal.