Control Protocol for Trusted WLAN Offload and IP Preservation
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting increased traffic growth and network capacity, particularly in licensed spectrum, due to limitations in multiple packet data network connections and IP preservation during handovers, especially when offloading traffic from WWAN to WLAN.
Innovation Solution
A method for establishing multiple packet data network connections through a trusted wireless local area network (WLAN) using a new control protocol that supports concurrent Non-Seamless Wireless LAN Offload (NSWO) and IP preservation during handovers, allowing for simultaneous access to multiple access point names (APNs) and differentiating packet data network connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traffic is offloaded from WWAN to WLAN, then network capacity is improved, but IP preservation during handovers deteriorates
Solution Approach 1:
The patent introduces a control protocol as an intermediary mechanism between the UE and network infrastructure. This protocol carries IP preservation information and coordinates handover procedures between WWAN and WLAN, enabling IP continuity to be maintained during offloading operations without sacrificing network capacity benefits
2Adaptability or versatility
If multiple PDN connections are supported, then adaptability is improved, but device complexity deteriorates
Solution Approach 1:
The control protocol serves multiple functions simultaneously: it establishes PDN connections, preserves IP addresses, manages handovers, and supports both WWAN and WLAN access types. By consolidating these functions into a single universal protocol, the patent enables multiple PDN connections without proportionally increasing UE implementation complexity
Solution Approach 2:
The protocol utilizes parameter changes in capability indications and information elements to dynamically manage multiple PDN connections. By encoding connection management information in standardized protocol parameters, the patent achieves high adaptability while keeping UE implementation straightforward through parameter-based control rather than complex procedural logic
3Adaptability or versatility
If a new control protocol is implemented, then functionality is improved, but ease of operation deteriorates
Solution Approach 1:
The control protocol is designed to copy and extend existing EAP protocol structures and information elements. By reusing established protocol frameworks and adding new functionality through extensions rather than creating entirely new protocols, the patent improves functionality while maintaining backward compatibility with existing network infrastructure and implementations
Solution Approach 2:
The protocol includes preliminary capability indication mechanisms that are exchanged during initial connection setup. These preliminary actions allow both UE and network to declare support for the new protocol features before actual data transfer begins, enabling smooth operation without disrupting existing systems while introducing enhanced functionality
Data Source
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AI summary
Certain aspects of the present disclosure generally relate to wireless communications and, more particularly, to methods and apparatus for utilizing a control protocol to establish multiple packet data network (PDN) connections through a trusted wide area network (TWAN). Techniques are provided for expanding mobile network capacity by offloading traffic from wireless wide area networks (WWAN) to other types of networks, including wireless local area networks (WLAN).