IMS Registration Mechanism for Seamless WLAN Cellular Transitions
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Solution Overview
Problem
Users face challenges in seamlessly transitioning between different wireless communication networks and protocols, such as WLAN and cellular networks, leading to service disruptions and suboptimal Quality of Service (QoS), due to the complexity of managing multiple network domains and protocols.
Innovation Solution
The implementation of methods and systems that enable seamless registration and re-registration of wireless communication devices for IP Multimedia Subsystem (IMS) services across packet-switch and circuit-switch domains, using mechanisms like service-based registration requests and re-registration requests, to maintain continuous service and optimal QoS during transitions between WLAN and cellular networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless communication devices support multiple communication protocols and network domains (WLAN, 2G, 3G, etc.), then the functionality and versatility of the device is improved, but the complexity of managing network transitions and registration increases
Solution Approach 1:
The patent segments the network management process by separating circuit-switched domain registration from packet-switched domain registration. The device independently manages registration in each domain, allowing parallel or sequential registration without interference. This segmentation simplifies the overall management complexity by breaking down the monolithic registration process into manageable, independent components.
Solution Approach 2:
The patent performs preliminary registration in the packet-switched domain before circuit-switched domain registration is complete or as a preparatory step. By establishing packet-switched services in advance, the device ensures that data services are already configured and ready, reducing the overall setup time and simplifying subsequent network transitions.
2Reliability
If the device performs registration in both circuit-switched and packet-switched domains, then service reliability is improved, but the registration time and service disruption increase
Solution Approach 1:
The patent performs packet-switched domain registration as a preliminary action before or during circuit-switched domain registration. By establishing packet-switched services in advance, the device ensures that data services are already configured and ready, reducing the overall setup time while maintaining service reliability through dual-domain registration.
Solution Approach 2:
The patent maintains continuous registration processes in both circuit-switched and packet-switched domains simultaneously or in overlapping time periods. This continuity ensures that services remain available without interruption, as the device can fall back to either domain if one becomes unavailable, thereby reducing effective service disruption time.
3Reliability
If the device checks IP address changes and performs re-registration, then service reliability is improved, but the signaling overhead and network traffic increase
Solution Approach 1:
The patent implements a feedback mechanism where the device monitors IP address changes in the packet-switched domain and triggers re-registration only when necessary. This conditional feedback approach ensures service reliability by maintaining up-to-date registration information while minimizing unnecessary signaling traffic by avoiding redundant re-registration operations.
Solution Approach 2:
The device autonomously monitors its own IP address status and determines when re-registration is needed without requiring external network triggers. This self-service approach allows the device to manage its own registration state efficiently, reducing network signaling overhead by only initiating re-registration when actually necessary rather than responding to network-wide registration requests.
Data Source
AI summary
Described aspects provide for improving the mobility of wireless communication devices between one network domain and another network domain, specifically, but not limited to, between a Wireless Local Area Network (WLAN) and a cellular network and the like. Present aspects provide for services to be moved seamlessly and in a reliable manner between the cellular and WLAN domains in order to minimize service disruption for the end user and provide the requisite Quality of Service (QoS) for the different applications. The aspects herein presented provide for various mechanisms that serve to improve the decision points related to when and what technology each service is expected to be associated with and provides better techniques to move the wireless communication device between cellular and WLAN domains when in-traffic and when idle.