A Simple Model for Calculating SIP Signalling Flows in 3GPP IP Multimedia Subsystems
NETWORKING '02 Proceedings of the Second International IFIP-TC6 Networking Conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; and Mobile and Wireless Communications
ISCC '06 Proceedings of the 11th IEEE Symposium on Computers and Communications
Optimization of SIP Session Setup Delay for VoIP in 3G Wireless Networks
IEEE Transactions on Mobile Computing
A Cross-Layer (Layer 2 + 3) Handoff Management Protocol for Next-Generation Wireless Systems
IEEE Transactions on Mobile Computing
An overview of vertical handover decision strategies in heterogeneous wireless networks
Computer Communications
Analysis of SIP-Based IMS Session Establishment Signaling for WiMax-3G Networks
ICNS '08 Proceedings of the Fourth International Conference on Networking and Services
International Journal of Communication Systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
Wireless Communications & Mobile Computing - Wireless Technologies Advances for Emergency and Rural Communications
Minimizing SIP session re-setup delay over wireless link in 3G handover scenarios
EURASIP Journal on Wireless Communications and Networking
Autonomic personalized handover decisions for mobile services in heterogeneous wireless networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Application signal threshold adaptation for vertical handoff in heterogeneous wireless networks
NETWORKING'05 Proceedings of the 4th IFIP-TC6 international conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communication Systems
Vertical handoffs in fourth-generation multinetwork environments
IEEE Wireless Communications
IEEE Transactions on Multimedia
Analysis of SIP-based mobility management in 4G wireless networks
Computer Communications
Quality-of-service mechanisms in all-IP wireless access networks
IEEE Journal on Selected Areas in Communications
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Typically, WiFi-to-3G handover is time-critical depending on mobility and speed of mobile host (MH) while 3G-to-WiFi handover is optional for better quality of service and less cost. In this paper, a WiFi-to-3G vertical handover scheme is proposed in order to reduce the total handover delay and keep it within a desirable maximum limit. Our main concern is focused on MH attached currently to WiFi, which tries to move out of WLAN for switching to 3G link. Received signal strength (RSS) is actually an important decision criterion for vertical handover as well as horizontal handover. However, WiFi-to-3G vertical handover cannot be triggered by the signal decay of 3G system since there is no comparable signal strength available to aid the 3G handover decision. During WiFi-to-3G vertical handover, moreover, multimedia session initiation protocol (SIP) session re-setup with resource reservation cannot be completed before network resources along the new path via 3G are successfully reserved. Hence, RSS-based vertical handover algorithm with SIP session re-setup is proposed. From the results, we can know that well-defined or dynamically-adjusted threshold values could result in getting enough time in order to re-setup SIP session with resource reservation.