IMS-Based Packet Routing for Mobile-WLAN Interworking
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Solution Overview
Problem
Current interworking systems between mobile communication networks and wireless LANs lack the ability to dynamically allocate packets across networks, leading to inefficient load distribution and limited connectivity options, as they are restricted by fixed network relationships and protocols like GPRS and Mobile IP.
Innovation Solution
A radio communication system that allows packet allocation and route switching between mobile networks and wireless LANs using IMS servers, enabling users to specify packet transmission routes and gateways for each port, even when networks do not share address information, thereby facilitating flexible packet transfer and load balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal uses Mobile IPv6 to maintain ongoing communication sessions when moving between wireless LAN and mobile communication networks, then communication continuity is improved, but network load distribution remains inefficient due to fixed network relationships
Solution Approach 1:
The patent segments packet routing by port number, allowing different packets from the same terminal to be routed through different gateways based on their port numbers. This enables fine-grained control of packet allocation across multiple networks (mobile network and wireless LAN), improving load distribution while maintaining communication continuity through the IMS server's centralized routing management.
Solution Approach 2:
The patent implements dynamic packet allocation where the IMS server continuously monitors network conditions and dynamically adjusts packet routing decisions based on current load states. The system transitions from static network relationships to dynamic, condition-based routing, allowing terminals to switch networks flexibly while maintaining ongoing sessions.
2Stability of the object's composition
If interworking systems use fixed network relationships and protocols like GPRS and Mobile IP, then network stability is maintained, but adaptability to different network conditions and flexible packet transfer is limited
Solution Approach 1:
The patent introduces the IMS server as an intermediary between terminals and multiple networks (mobile network and wireless LAN). The IMS server mediates packet routing by receiving packets from the mobile network, determining optimal destinations based on port numbers and network conditions, and forwarding packets through appropriate gateways. This intermediary enables flexible packet transfer while maintaining overall network stability through centralized control.
Solution Approach 2:
The patent changes the routing parameter from fixed network associations to port number-based routing. Instead of binding terminals to specific networks through fixed protocols, the system uses port numbers as dynamic parameters to determine packet destinations, allowing flexible adaptation to different network conditions while maintaining stability through the IMS server's centralized management.
3Device complexity
If packets are routed through a single gateway in existing interworking systems, then routing complexity is reduced, but load balancing and network optimization capabilities are lost
Solution Approach 1:
The patent segments the packet routing function by port number, with the IMS server dividing packets into different routing paths based on their port numbers. Multiple gateways are utilized simultaneously for different packets, enabling load balancing across multiple network paths while keeping individual routing decisions simple and rule-based.
Data Source
AI summary
A terminal (101) includes interfaces for communication with a mobile network (102) and a wireless LAN (103). A first IMS server (107) performs IMS call control processing relating to terminals located in the mobile network (102) and a second IMS server (111) relays a signal relating to IMS call control processing concerning terminals located in the wireless LAN (103). These IMS servers search for a mobile network packet gateway (106), a packet data gateway (110), and a gateway to be controlled by a route change request for requesting change of a packet transmission path and relay the route change request. The route change request provided from the terminal (101) is relayed by the IMS servers to provide the change request to all networks specified. The packet transmission path is changed by the gateway in accordance with the request. Thus, the terminal having the interfaces for both of the mobile communication network and the wireless LAN can select a network to use for each communication port.