Universal mobile telephone system umts is a third generation mobile and wireless communications standard which is also being developed into a fourth. The universal mobile telecommunications system umts is a third generation mobile cellular system for networks based on the gsm standard. Evolution from 2g3g to lte utran lte handover with gn engineers responsible for network planning, design and deployment, 1. The home subscriber server hss component has been carried forward from umts and gsm and is a central database that contains information about all the network operators. Dec 01, 2019 vertical handover is performed when a mh moves from one base station bs to an ap or another bs technology such as umts wifi, lte wifi or umts lte wifi.
The thesis work is about the investigation of different handovers in the 3g umts network. Written by experts actively involved in the 3gpp standards and product development, lte for umts, second edition gives a complete and uptodate overview of long term evolution lte in a systematic and clear manner. Radio protocols for lte and lte advanced pdf download. You are find about lte ebooks by tag lte at an introduction to lte. Pdf award lte 304 lte and gsm umts interworking 123 mlmb. Umts is a trade mark of etsi registered for the benefit of its members. Enhanced handover mechanism in long term evolution lte networks. Summary introduction to wireless lte 4g architecture and. This form of handover occurs when mobiles have to change between radio access technologies, e. The thesis work is about the investigation of different handovers in the 3g umts network which is the vital issue to the network to maintain the users connection during in the ongoing.
Having evolved from universal mobile telecommunications system umts, the specifications are known as the evolved umts terrestrial radio access network eutran. Logs taken from drivetests in multiple dense urban areas for existing 3g systems. A tutorial on lte eutran and lte self organizing networks. The term 3gpp specification covers all gsm including gprs and edge, wcdma including hspa, lte including lte advanced and lte advanced pro and 5g specifications. Formal verification of lteumts handover procedures core. These initial messages can be seen, for example, in the chart in fig. B c guido m ricardo s and luciana c 2017 formal verification of lteumts.
Geran gsm and edge radio access network ps core as in rel. Download as pptx, pdf, txt or read online from scribd. Developed and maintained by the 3gpp 3rd generation partnership project, umts is a component of the international telecommunications union imt2000 standard set and compares with the cdma2000 standard set for networks based on the competing. Lte femtocells another offloading is via lte enodeb femtocells compliant with 3gpp releases 89 and including l2l3 stacks performances. Using cdma there are several forms of handover that are implemented within the system. Lte mobile communicates with just one base station and one cell at a time and there are following. During the process of handover, the wireless connection will be lost if a mh takes a longer time to attach the new attachment point. Wrfd150219 coverage based ps redirection from umts to lte. In 4, authors proposed a handover algorithm with a new handin procedure in lte networks called sq speed and qos based on the user equipment ues velocity and qos traffic. Lte and wimax coverage range are one of the important factors that affect the quality of broadband access services and mobile cellular systems in. Gaba, execution of soft handover in umts using opnet simulator, international journal of. Lte long term evolution is a fourth generation cellular network technology that provides improved performance related to data rate, coverage and capacity compared to legacy cellular systems. Therefore handover is the process in which ue changes the cell.
Oct 15, 2010 handover key management in mobile wireless networks targets to minimize the effects of a possible key compromise in the access points. Division multiple access ofdma and lte will provide us download data dates of about. There is a centralized controller called radio network controller rnc to perform handover. Pingpong reduction for handover process using adaptive hysteresis. Lte key management analysis with session keys context. Seamless voice handover between packet switched lte and the circuit switched umts network is therefore an important tool in solving this problem. Long term evolution lte, handoverhandoff ho, user equipment ue, pingpong handover.
Radio protocols for lte and lte advanced pdf download download it once and read it on your kindle device, pc, phones or tablets. However, the changes compared to 2g to 3g and 2g3g to lteeps are much more. This report investigates the performance of interradio access technology voice handover between lte and umts. The impact of the lte handover procedures on the overall user experience. This document is originally edited by justin ma and it is free to share to everyone who are interested. In previous blog posts i have discussed intragnbdu handover and. Comprehesive coverage of umts 3g news, licensing, business developments, 3g wcdma telecommunication technology, multi media mobile phones and future communications. From theory to practice provides the reader with a. The utra and eutra technologies are part of universal mobile telecommunication system umts. The conditions for ps handover from umts to lte are met but the ue or the network does not support the handover from umts to lte. Building upon on the success of the first edition, lte for umts, second edition has been revised to now contain improved coverage of the release 8 lte details, including field.
Message sequence diagram of handover procedure in 3gpp lte 6. Please visit our website in order to download the latest versio. Along with lte introduction, 3gpp also standardized single radio voice call continuity srvcc in release 8 specifications to provide seamless continuity when an ue handovers from lte coverage eutran to umts gsm coverage utrangeran. The schemes evaluated were voice call continuity vcc for umts to lte handover. Tdd final layering strategy lte telecommunication gsm. Handover optimization scheme for lteadvance networks. Lte the umts long term evolution wiley online library. This is parameter for cell reselection lte to umts and umts to lte. I encourage you all to download the example technologies and try convergence for yourself. Therefore, all handovers are performed as hard handovers.
The research topic of this thesis which is lte handover performance. The cross reference between gsm, umts, 3gpp and etsi identities can be found under. Start reading radio protocols for lte and lte advanced on the free kindle. A tutorial on lte eutran and lte self organizing networks son. Indeed lte architecture is based on several security associations, instead of umts based network that handles one security association. The basic 3g umts cellular system enabled data rates up to 2048kbps to be achieved. Feb 01, 2017 this message represents a user data exchange between ms and enbmmernc, done before the handover procedure itself. Utra, eutra, umts, lte, lte a and gsm are described in documents from an organization called the 3rd generation partnership project 3gpp. Gsm umts lte interworki free download as powerpoint presentation. In 5, authors proposed a new handover scheme that optimized the selection of target bs for both handin and handout mobility scheme between wimax and femtocells. Lte encryption and integrity protection flowlte presentation and call flows cover the security session setup. Summary if a umts lte dualmode ue establishes services in the umts network, this feature allows the rnc to redirect the ue to the lte network when both umts and lte coverage is available and the ue establishes only ps services.
Pdf optimized handover algorithm for twotier macro. Umts etsi proposed gsmnatdma gprs evolution under name universal mobile telecom. Pdf award lte 304 lte and gsm umts interworking 123. Wrfd150219 coverage based ps redirection from umts to. However, the changes compared to 2g to 3g and 2g 3g to lte eps are much more. Lte the umts long term evolution from theory to practice. Structures are used to organize the parameters used to define, and then generate umts waveforms.
In this context, one of the main goals of lte is to provide fast and seamless handover from one. Handover interface for lawful interception li 3gpp ts 33. Difference between gsm, umts, cdma, cdma2000, and lte. Intra lte intrammesgw handover using the x2 interface this procedure is used to handover a ue from a source enodeb senb to a target enodeb tenb using the x2 interface when the mobility management entity.
Gsm umts, cdmacdma200, and lte are mobile standards that were developed to work with different networks. Performance evaluation of voice call handover between umts. Lte omnet long term evolution the successor to umts and also hspa. Pdf lte the umts long term evolution from theory to. Release with redirect rwr to long term evolution lte is a networkcontrolled interradio access technology irat mobility feature for moving lte umts capable user equipments ues from an access network utilizing wideband code division multiple access wcdma to an access network utilizing lte when the ues transition to lower activity states. Handover is the process in which the radio access network changes the radio transmitters or. Solutions were proposed during the last sa3 meeting to be able to deduce new keys from the umts based keys if there would be a handover from a umts based network to an lte based network. Utran iu mode to eutran inter rat handover with sgw change.
This book explains the basic components, technologies used, and operation of umts lte systems. May 05, 2014 generation manifestation, long term evolutionadvanced lte a, are technologies that operators are deploying, or planning to deploy, to help them tide over this evolutionary trend. Then we focus on the self organizing networks son concept being implemented in lte and handover optimization techniques. When ue reaches end of coverage area for umts services, it can handover to a 2g service like gsm if the ue supports multiple rat. The next generation of mobile access networks will support different access technologies like umts, wlan, wimax and lte. Gsm intermsc handover call flowthis call flow describes the handover between two cells handled by different mscs gsm intermsc handover call flow explore moreinter msc handover is analyzed in detail. Handover between different radio technology networks, for example gsm umts and umts well look at intra lte handovers with x2ap signaling and s1ap signaling first, then interrat handovers in lte i. Pdf handover scenario and procedure in ltebased femtocell. Handover happens toward the other lte nodes intermme and intersgw interrat. It is a handbook of umts lte epc handover call flows. Lte, the handover procedure in lte and the deployment scenario of henb.
Individual copies of the present document can be downloaded from. Formal verification of lteumts and ltelte handover. One key area of any cellular telecommunications system is the handover handoff from one cell to the next. Pdf handover between macrocell and femtocell for umts. Nokia lte handover feature lte telecommunication wireless. Soft and softer handover were introduced in wcdma architecture. Lte x2 handover sequence diagrams x2 interface connects enodebs in lte.
Some of the umts functions in the lte toolbox product require many parameters. Lte handover in sona handover is a process in which connected cellular call is transferred from one cell site to another without disconnecting the session. Pdf optimized handover algorithm for twotier macrofemto. Umts handover description free download as powerpoint presentation. Services umts most of 3g licenses in europe required operator to deploy a umts system covering x% of population by a specific date y germany. The complete proverif handover models are available for download at the url handovermodels. Evolution from 2g3g to lte utran lte handover with gn engineers responsible for network. The feature queuing of wcdma calls in bss makes it possible to provide enhanced network accessibility in gsm to prioritized subscribers coming from the wcdma network via the directed retry procedure. Umts terrestrial radio access network pstn msc server gmsc server sgw sgw 3gpp rel. Umts handover description mobile technology physical. The umts world is an 3g mobile system news and information provider. After combined hard handover and srns relocation procedure9, fig.
Lte utran handover and umts hspa networks to lte networks. The features described are gsm umts cell reselection and handover, smooth gsm to wcdma unloading, handover with usage of service indicator, combined cell reselection triggering gsm to wcdma, combined handover triggering gsm to wcdma and optimized throughput at gsm to wcdma. Hence, at some point, the user equipment ue will disconnect from the serving enb senb and connect to the target enb tenb. Explore the inter enodeb handover procedures over the x2 interface. Not a full form of umts handover, but the ue communicates with more than one sector managed by the same nodeb. Generally, in umts wlan overlay networks, when a ue moves from umts to wlan, it can make a choice of handover to wlan on its own initiative and break off the umts connection after finishing the.
We describe and analyze how the new 3gpp long term evolution lte security architecture and handover keying management fulfills this target. Mlb feature base on load to trigger interfrequency handover for all lte layer turning on. Revised versions of many of these specifications are produced up to four times a year following the quarterly tsg plenary meetings. Overall logic is simple and this process are the same or at least very similar in every technology.
Pdf improving vertical handovers for realtime video. The complete proverif handover models are available for download at the url lte. Aware handover in lte systems for load balancing in. Description in a umts lte multilayer network, if a ue or the network does not support ps handover from umts to lte, then the ue will be redirected from umts to lte when all the following conditions are met. Speed requirements for 4g service have been set at a peak download speed of. In lte advance method able also to operate more efficiently with respect to the use of spectrum, and also to provide the much higher data rates that are being required. Developed and maintained by the 3gpp 3rd generation partnership project, umts is a component of the international telecommunications union imt2000 standard set and compares with the cdma2000 standard set for networks based on the competing cdmaone. You will discover why mobile telephone service providers are upgrading their 2nd and 3nd generation digital mobile to a more efficient and feature rich umts lte generation system. The lte son concept aims at minimizing the human involvement in network maintenance and operation. Pdf energy efficiency and security between umts and lte. Gsm handover call flow intra mscthis call flow covers a simple case of call handover in gsm. In this context, one of the main goals of lte is to provide fast and seamless handover from one cell to another to meet a strict. Here a user has an active call and is moving from the rockville cell to the bethesda cell.
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