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Unformatted text preview: 978-1-4244-2677-5/08/$25.00 ©2008 IEEE ENHANCED IPMULTIMEDIA SUBSYSTEM (IMS)FOR FUTURISTIC TACTICAL NETWORKS Sherry Wang [email protected] Harold Zheng [email protected] Johns Hopkins University / Applied Physics Laboratory ABSTRACT A critical element of the all-IP architecture is IP Multime-dia Subsystem (IMS). IMS is a maturing technology and has been standardized by wireless cellular industry. How-ever, IMS was not designed and developed for using in military environments and supporting associated applica-tion services. Introducing IMS into futuristic military net-works for supporting future combats has to face different challenges. In this paper, the authors explain advantages and challenges of using IMS for supporting multimedia experience in tactical environments. The paper proposes an enhancement to improve IMS performability. Key words: IMS, mobility, signaling, SIP, tactical-network, performability I.INTRODUCTION One of the critical elements of the All-IP architecture  for wireless mobile networks is IP Multimedia Subsystem (IMS). It enables wireless mobile users to access advanced data services without concern for access technologies. IMS as a mature commercial technology has the potential to become a common platform in the Department of Defense (DoD) network-centric all-IP infrastructure. However, there have been no coordinated efforts to validate its feasi-bility and vulnerability for military and national security networks. Applying IMS to military heterogeneous net-works, to dynamic operational environments, and to diver-sified applications is the challenge. In a tactical network, mobility is essential. Mobility in-volves movements of both user devices and networks, which would impact the organizing and formatting of a network. A mobile node should be accessible from other nodes even when a network attachment is changed. In ad-dition, the ongoing communication should be kept alive before, during, and after the node movement. It is a fun-damental need to sustain continuous communication and a constant level of performance during node movements. All these requirements present unique challenges for the use of IMS in a tactical environment. In this study, the authors focus on signaling quality (in terms of the signaling delay and successful probability) of an IMS system and the system reliability. The rest of the paper is organized as follows. Section 2 briefly introduces the concept of IMS. Section 3 illustrates the negative impacts of disadvantaged tactical networks on the performance of SIP-based networks and application services using analysis and a lab experiment. Section 4 proposes a chain-based SIP session control scheme to mitigate the “unreliable signaling” problem. It also ana-lyzes the performance improvement of the proposal. Sec-tion 5 concludes this study....
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This note was uploaded on 09/21/2010 for the course ECE 567 taught by Professor Attkin during the Spring '10 term at Academy of Design Tampa.
- Spring '10