Soft handover and downlink capacity in umts network, tomic. These handovers are given a variety of names including interrat handover as they are handing over between different forms of radio access technology, intersystem handover, and umts gsm handover. Handover between lte and 3g radio access technologies. If so, share your ppt presentation slides online with. In order not to confuse the jargon, the definition was kept. When umts came this definition was no longer valid. All the smart mobile devices come with wlan support wifi networks are low cost. Having selected a suitable base station the handover takes place, but without any time synchronisation having occurred.
Abstract universal mobile telephone system umts is a third generation. Comparison between soft handover and hard handover in. Universal mobile telephone system umts is a third generation mobile and wireless communications standard which is also being developed into a fourth generation technology. In such a situation, the mobile connection should also remain intact especially if the user is currently using the phone.
Handover gsm umts presentation free download as powerpoint presentation. This completely revised and updated edition of the highly successful umts signaling provides a deep insight into all aspects of umts signalling. What is handover handoff changing the point of connection while communicating. X2 handover is initiated if the if the target cell is served by the same mme as the current cell the message includes ue context information that identifies the ue. It is a handbook of umtswcdma call flows for handovers. In a cell, interrat handover can only be triggered by 3a or 3c event, which is controlled by interrat handover tactic rathotactic. In 4, an architecture for umts wimax is introduced based on tight coupling interworking and using a single radio ms. Comprehesive coverage of umts 3g news, licensing, business developments, 3g wcdma telecommunication technology, multi media mobile phones and future communications. The ue uses the neighbour list provided by the umts network to monitor and select a suitable candidate base station. It is a handbook of umts wcdma call flows for handovers. Irat basics and interrat handover with example of wcdma rat to gsm rat handover, refer irat handover. This form of handover is supported within gsm and a neighbour list was established to enable this occur easily. By definition, handover means transfer of user connection from one radio channel to other.
The steps in the procedure of soft handover are explained. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The lte to umts handover proverif model is used here for describing how the security properties specified in section 5. There are following categories of handover also referred to as handoff. Using compressed mode handover the ue uses the gaps in transmission that occur to analyse the reception of local gsm base stations. Pdf universal mobile telephone system umts is a third generation mobile and wireless communications standard which is also being developed into a. Leaving circuit switched technology far behind lte became the first allip mobile network.
A free powerpoint ppt presentation displayed as a flash slide show on. In umts systems different handover types have been introduced to cope also with other requirements as load control, coverage provisioning and offering quality of services. One of the key aspects of any cellular telecommunications systems is the handover from one cell or sector to another. The successful trial, deployment, operation and troubleshooting of 3g or umts infrastructures and. For handover from gprs to umts, the latency in overlapping area is 118. The soft handover procedure is composed of several functions.
Dukic2 1 mobtel srbija bk ptt 2 electrical engineering faculty, belgrade i introduction mobility is the main advantage of mobile cellular systems. This definition was formed before the advent of umts. Checklist for job handover if i complete this checklist do. Ensure that the handover process will be implemented across the organisation. Optimization of soft handover parameters for umts free download as pdf file. The investigation is based on the umts qos traffic classes. Issues and optimization of umts handover diva portal. Wcdma wideband code division multiple access technology introduces other kind of handovers, namely. Soft handover make before break new connection is activated before the old is broken used in umts to improve the signal quality uplink and downlink signals may be combined for better signal a mobile may in umts spend a large part of the connection time in soft handover better connection reliability more seamless handover. Interrat intersystem umts gsm handover in many instances it is necessary for the umts radio access network to handover to the 2g gsm network. Pdf the effect of handover on umts services researchgate.
Nov 26, 2012 this tutorial describes lte handover types and procedures. Feb 19, 20 soft handover make before break new connection is activated before the old is broken used in umts to improve the signal quality uplink and downlink signals may be combined for better signal a mobile may in umts spend a large part of the connection time in soft handover better connection reliability more seamless handover. The umts world is an 3g mobile system news and information provider. This document is originally edited by justin ma and it is free to share to everyone who are interested.
In this paper we present a soft handover algorithm for wide band cdma based eumts networks and the associated power control algorithm. Oct 28, 2017 this tutorial explains the procedure of hard and soft handovers in 3g wcdma or 3g umts. In this paper we briefly touch upon the procedures executed by the user equipment ue and the various network elements to provide the handover services requested by the ue. Basic gsm to umts handover procedure not requiring the establishment of a. Handoff or handover is a control process initiated when a mobile moves from its current cell to its neighboring cell. The research topic of this thesis which is lte handover performance evaluation based on power budget handover algorithm, focuses on different combinations or settings of hom and ttt values to evaluate the handover performance based on reference signal received power rsrp measurement within certain. Introduction handover ho is key procedure for ensuring that users can move freely within. All the other handover models follow the same modeling technique. There are two further divisions of this category of handover. Within umts architecture, the rrm entity is responsible for the utilization of the air interface resources and it covers power control, handover, admission control, congestion control and packet. This form of handover occurs when the base station hands off the ue by passing it the details of the new cell to the ue. Umtsfdd is an acronym for universal mobile telecommunications system umts frequencydivision duplexing fdd and a 3gpp standardized version of umts networks that makes use of frequencydivision duplexing for duplexing over an umts terrestrial radio access air interface.
Hence, the latency for handover from umts to gprs and gprs to umts does not very too much in both. This tutorial explains the procedure of hard and soft handovers in 3g wcdma or 3g umts. An introduction about intersystem handovers and cell changes irat handover analysis troubleshooting irat ho using dashboard kpis how to find an irat handover and cell. The chapter structure has been reworked for improved usability for readers, as well as including many new features and updates. Like other mobile networks lte also have big challenges when it comes to mobility areas like handover and reselection. Formal verification of lteumts and ltelte handover. About this document this application paper covers the following topics. Within 3g umts there are several forms of handover including hard handover, soft handover, a form of handover called softer handover and a handover from one radio access technology to another called interrat handover. Comparison between soft handover and hard handover in umts. The average latency for handover from umts to gprs in overlapping area is 119 ms and in nonoverlapping area is 1. Pdf mobility is an important factor in cellular networks so handover should be used to avoid the termination of call when user signal travel.
This tutorial describes lte handover types and procedures. As the gsm 2g network is normally more extensive than the 3g network, this type of handover does not normally occur when the ue leaves. Pdf umts irat handover analsysis jachang ma academia. Umts handover control telecom knowledge and experience. Performance evaluation of voice handover between lte and umts a research report submitted to the faculty of engineering and the built environment, university of the witwatersrand, in partial fulfilment of the requirements for the degree of master of science in engineering johannesburg, 2011. Performance evaluation of voice call handover between umts. Optimization of soft handover parameters for umts antenna. The present document provides a mechanism giving reliable transfer of signalling messages within the 3gpp system. The following example will describe soft handover for best case scenario. Femtocell handover soft handover vs softer handover lte to wlan and wlan to lte handover umts to wlan and wlan to umts handover mobile wimax handover as per ieee 802. User information is sent all the cell belongs to active set.
Handovers are an important part of every cellular communication system. A user of a mobile phone will be moving continuously. This document is originally edited by justin ma and it is free to share to everyone who are intereste. They are used for providing mobility in cellular architectures.
Seamless hard handover means that the handover is not perceptible to the user. The handover to wifi network has become popular due to following benefits of wifi based networks. A1 contains an excerpt of the proverif model used to verify the lte to umts handover procedure. The successful trial, deployment, operation and troubleshooting of 3g or umts infrastructures and applications is the. Hard handover means that all the old radio links in the ue are removed before the new radio links are established. This iur open interface carries both signaling and traffic information for example during a. Handover in particular is more complicated in lte as lte has. When only ps service exists, adopt cell reselection process of ps service handover. Jul 09, 2014 it is a handbook of umtswcdma call flows for handovers. February, 28th 2005 overview in this document i make a study of third mobiles generation systems. Before describing the above scenario we need to know three important terms. Test measurement challenges and field environment test planning school of electrical engineering master. It also mentions wlanwifi to umts3g handover with message flow diagram.
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