Implementation Of An Ims Testbed For Wired And Wireless Clients

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Implementation of an IMS Testbed for Wired and Wireless Clients
Afaq Hasan Khan, Mohammed Abdul Qadeer
Department of Computer Engineering Zakir Hussain College of Engineering & Technology Aligarh Muslim University, Aligarh, India afaqkhan@zhcet.ac.in, maqadeer@ieee.org
Abstract—Rapid growth and evolution in the area oftelecommunications has compelled the network operators to provide seamless integration of all communication applications on a single system. In these circumstances IMS has established itself as a foundation for future wireless and wireline convergence. It provides an opportunity to build an open IP based service platform that will enable an easy and efficient deployment of new multimedia communicationservices mixing telecom and data services. As 3GPP IMS standards are in their evolving state it becomes very essential to test IMS clients during their development on a platform that simulates the IMS network. IMS client test bed also let the developers to test all error conditions which are not possible on a live. Moreover, it is an expensive deal to use an operator’s live network for testingpurpose. Aim of this paper is to discuss an efficient architecture for IMS and our experience of building an IMS client test bed using open source elements like OpenIMScore. The test bed is built to accommodate IMS clients operating on varied access types like LAN, GPRS/EDGE/UMTS and Wi-Fi. Keywords: IMS, NGN, 3GPP, OpenIMSCore, VoIP, Wi-Fi, WiMax, PoC.

to provide all the error conditions,moreover,              This paper first explores the architecture of an IMS network and then shares our experience of building a testbed using open source tools for testing IMS clients.

Fig. 1: Various access networks supported by IMS

I.

INTRODUCTION

Through the rolling-out of new services,including television-over-IP (IPTV), Voice-over-IP (VoIP), and double- and triple-play offerings, end-users are getting more experienced with using Internet-based technologies in their everyday lives outside the closed PC world. This opens up new perspectives regarding “Mobile Internet,” especially when transferring broadband services into the wireless communications world. IMS (IP MultimediaSubsystem) has emerged out as a key player in these conditions. It consists of an IP-based core network connected to multiple access networks to provide a converged service to wireless, wireline and cable subscribers. IP multimedia core network subsystem is a collection of different function, linked by standardize interfaces which grouped from one IMS administration network. Communication services such asmultimedia telephony, push to talk and instant messaging are offered by the IMS network over a session initiation protocol infrastructure. With the development of IMS clients, it also becomes important to ensure their testing on some platform which is am exact replica of the live network. Here comes in to picture the testbed for IMS clients which can be used to check a client with all possibletest cases. Need of a testbed was felt as a live network may not be able
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IMS architecture which was brought to the 3GPP as part of the standardization work for 3G mobile phone systems in UMTS (Universal Mobile Telephony System Networks). But, the flexibility of IMS network architecture has made it attractive to connect otheraccess network as well. Additional networks, including GSM & CDMA cellular networks, cable TV networks, Wi-Fi networks, WiMax Networks, enterprise and residential networks are being added to this common IMS core, ref to fig. 1. The addition of these additional access networks to an IMS core network provide market differentiating, leading edge, single number services to end users. II. ADVANTAGES OF...