Seamless WLAN to WWAN Handoff via Cellular Proxy
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Solution Overview
Problem
Current data handoff schemes, such as Mobile IP, experience data loss and delay during seamless roaming between wireless local area networks (WLANs) and wireless wide area networks (WWANs), especially for real-time multimedia applications, and are limited by the requirement for permanent IP addresses and network address translation.
Innovation Solution
A method and system that enables seamless data roaming and handoff between WLANs and WWANs by using a Cellular Controller to create a proxy for mobile devices, allowing automatic handoff of data connections without losing connectivity, even when moving between different networks, and supports dynamic data handoff without requiring changes in the carrier's network architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Mobile IP is used for data handoff between WLAN and WWAN, then mobility support is improved, but data loss and delay occur during handoff
Solution Approach 1:
The patent establishes a permanent IP address in the home network before handoff occurs. The home agent pre-configures tunneling capabilities and maintains persistent routing information, allowing seamless handoff without data loss or delay when the mobile node moves between networks.
Solution Approach 2:
The home agent acts as an intermediary between the mobile node and foreign networks. It maintains a permanent IP address assignment and uses tunneling to forward packets through intermediate networks, ensuring continuous connectivity during handoff between WLAN and WWAN without exposing the mobile node to data loss.
2Reliability
If Mobile IP with permanent IP address is used, then connectivity is maintained during roaming, but IPv4 address shortage and NAT limitations arise
Solution Approach 1:
The patent enables the mobile node to obtain a permanent IP address from the home network's address pool, allowing the same device to function seamlessly across both WLAN and WWAN networks. This universal addressing solution eliminates the need for separate address configurations and works with both public and private IP address schemes through the home agent's routing capabilities.
3Ease of operation
If Mobile Node physically connects to visited network first, then network registration is achieved, but handoff speed and seamless connectivity are reduced
Solution Approach 1:
The mobile node pre-obtains a permanent IP address from the home network before physically connecting to foreign networks. The home agent pre-configures tunneling routes and maintains persistent routing information, allowing the node to perform rapid handoff without the delay of physical reconnection and registration procedures at each visited network.
Data Source
AI summary
A method and associated system enables seamless data roaming and handoff between the wireless local area network (WLAN) and the wireless wide-area network (WWAN). This method enables a mobile device to originate a data connection in the WLAN and have this data connection be automatically handed off to the WWAN without losing the connection when the user goes outside the range of the WLAN. Similarly, it enables a mobile device to originate a data connection in the WWAN and have this data connection be automatically handed off to the WLAN without losing the connection when the user loses the signal of the WWAN. This solution assumes that the user has subscribed to data services from a cellular carrier that will authenticate the user before permitting the handoff.