Handover in umts pdf

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Handover or handoff is as important for UMTS as any other form of cellular telecommunications system. As with any other cellular telecommunications system it is essential that UMTS handover is performed seamlessly so that the user is not aware of any change. Any failures within the UMTS handover (or UMTS handoff) WCDMA Handover Principle and Relevant Parameters Page1 Foreword • Why mobile systems need handover? • It is decided by the characters of mobile system: • The mobility of UE • The mobile system is composed by cells which the coverage ability is limited. • Providing the continuous service in mobile system is the Mobile Telecommunication System (UMTS) for packet switched services. A description of handover technologies in the older second generation system Global System for Mobile. Communication (GSM) and wireless LAN (WLAN) is also given. In chapter two some aspects of mobility are discussed on a very general base. UMTS (Universal Mobile Telecommunications Network) is considered as 3rd generation networks. WCDMA (wide band code division multiple access) is the most important air interface which is being used in third generation and it works at 2GHz. Soft handover have been applied with WCDMA air interface to get the high Cellular technologies are continuously growing. Because of these reason, 3G cellular technology has been implemented. In UMTS, services are categorized into four UMTS quality of services classes. The handover is significant characteristic of. UMTS technology and is the major problem faced in implementation phase. The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF UMTS to GSM handover. 1-. Compressed mode handover: Using compressed mode handover the. UE uses the gaps in transmission that occur to analyse the reception of local GSM base stations. The UE uses the neighbour list provided by the UMTS network to monitor and select a suitable candidate base station. Having 3 Feb 2008 Mobile Station. MT. Mobile Termination/Terminal. OVSF. Orthogonal Variable Spreading Factor. PDF. Probability Density Function. PN. Pseudo-Noise. QoS. Quality of Service FIGURE 3.2 Horizontal Handover (UMTS Technology) FIGURE 3.5 Inter System Handover between GSM and WCDMA 26 Feb 2002 S-72.333. Postgraduate Course in Radio Communications. 2001-2002. Handover in WCDMA Uplink and. Downlink. Performance of Handover. Algorithms. Kimmo Hiltunen, 39195V. Kimmo.Hiltunen@lmf.ericsson.se In this paper UMTS technology is used to describe the handover from one mobile circle to Keywords: UMTS, RNC, soft handover, softer handover, hard handover. 1. .. NETWORK. SIMULATION. AND. PERFORMANCE. ANALYSIS USING OPNET” [Online]. Available www.cs.fredonia.edu/zubairi/opnet/op2k_jz. pdf