Elysium Technologies Private Limited
ISO 9001:2008 A leading Research and Development Division
Madurai | Chennai | Kollam | Ramnad | Tuticorin | Singapore
#230, Church Road, Anna Nagar, Madurai 625 020, Tamil Nadu, India
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A b s t r a c t
Mobile Computing
2010 - 2011
01 SIP-Based IMS Signaling Analysis for WiMax-3G Interworking Architectures
The third-generation partnership project (3GPP) and 3GPP2 have standardized the IP multimedia subsystem (IMS) to
provide ubiquitous and access network-independent IP-based services for next-generation networks via merging
cellular networks and the Internet. The application layer Session Initiation Protocol (SIP), standardized by 3GPP and
3GPP2 for IMS, is responsible for IMS session establishment, management, and transformation. The IEEE 802.16
worldwide interoperability for microwave access (WiMax) promises to provide high data rate broadband wireless
access services. In this paper, we propose two novel interworking architectures to integrate WiMax and third-
generation (3G) networks. Moreover, we analyze the SIP-based IMS registration and session setup signaling delay for
3G and WiMax networks with specific reference to their interworking architectures. Finally, we explore the effects of
different WiMax-3G interworking architectures on the IMS registration and session setup signaling delay
02 Accurate and Energy-Efficient Range-Free Localization for Mobile Sensor Networks
Existing localization algorithms for mobile sensor networks are usually based on the Sequential Monte Carlo (SMC)
method. They either suffer from low sampling efficiency or require high beacon density to achieve high localization
accuracy. Although papers can be found for solving the above problems separately, there is no solution which
addresses both issues. In this paper, we propose an energy efficient