Ericsson research isafjordsjgatan 14 e, 146 80 stockholm, sweden. It can be downloaded here and the offer includes a resource guide on lte and a poster, being this last one mailed for free to any address you provide. There are many specific reasons why lte dropped altogether soft handover connectbeforebreak from the system design. Ims is the 3gpp voice over ip solution which is being deployed in the lte networks as the voice solution. Though there are various reasons, i documented here three causes why soft handover was omitted from lte.
Conference on future information engineering fast authentication during handover in 4g ltesae networks mourad abdeljebbar a, rachid. Lteadvanced pro is the new official marker approved by the 3gpp in october 2015 to denote the next stage in development towards 5g, following lteadvanced ltea and lte before it. Pedersen nokia networks niels jernes vej 10, dk9220 aalborg. Coordinated multipoint comp transmission and reception is the key technique in lte advanced to improve the celledge throughput andor system throughput. The tenb checks for resource availability and, if available, reserves the resources and sends back the handover request acknowledge message.
Moreover, the architecture considered operates at link level, which provides lower latency and higher scalability. Nov 06, 2016 lets discuss why lte does not have soft handover as in wcdma and cdma systems. In this paper, an advanced handover technique is proposed. Dec 04, 20 lte x2 handover call flow procedure prashant panigrahi december 4, 20 4 intra lte intrammesgw handover using the x2 interface 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 mme and serving gateway sgw are unchanged.
Lte optimization engineering handbook is a comprehensive reference that describes the most current technologies and optimization principles for lte networks. Long term evolutionadvanced lte a is a major enhancement of the lte standard proposed by the 3gpp to meet the 4g mobile communication standards. Handover in lte lte telecommunication transmission. While the lte handover procedures defined in release 8 provide mobility support, they. Using nctuns6 simulator it is shown that lte 4g provides less handover latency in comparison to that of. Jul 07, 2017 handover process in lte, handover in 4g telecom, lte handover types, lte handover call flow, intra enodeb handover lte, lte handover events, lte handover tutorial, handover in lte, sharetechnote, handover in lte 4g parameter. In the wifi world, handoff, handover and roaming, are all the same, referring to end users moving between different networks with or without supporting ip session continuity. This document describes the handover procedure defined as emm case 6 in our technical document, eleven emm cases in an emm scenario 1.
In this paper, handoff, handover and roaming are used as in the mobile world. Figure 320 illustrates the set of 3 intra lte mobility scenarios identified for mobility robustness optimisation. The simulation results show that the lhhaarc outperforms three wellknown handover algorithms by having less number of average handovers per ue per. Handover principles and handover measurements in lte. Lte s1 handover s1 handover lte mobile enodeb network core. Design principles and performance konstantinos dimou. Lte uses universal frequency reuse n1 without soft handoff. Description download handover optimization lte comments. Fast authentication during handover in 4g ltesae networks. Lte a purely depends on the hard handover, which may cause disconnection to occur if the handover is not fast enough. An s1 handover is a fallback for scenarios where x2 interface is not available. Handover is triggered when the serving cell signal strength is below a certain threshold and neighboring cell signal strength is better than serving cell signal strength. This procedure may relocate the mme andor the serving gw.
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. Performance evaluation of received signal strength based hard handover for utran lte mohmmad anas, francesco d. Handover in lte system handover is the mechanism by which ue moves from one cell to the other. Sir, i have not got a email download link to download the ppt of handover in 4g,though comlete registration. X2 handover is performed between a source enb and a target enb through the x2 interface. Umts long term evolution lte technology introduction. Start reading radio protocols for lte and lte advanced on the free kindle. Joint processing jp in comp technology provides multiple data transmission points for each user among multiple cooperated radio base stations. At runtime, in debugging builds, if this condition is not true, the program prints the source file. Radio protocols for lte and lte advanced pdf download. Ims provides a framework for supporting ip based services and requires new imsspecific network elements as part of the dedicated core network architecture. If the target cell id is known by enodeb, it will proceed with the handover.
Analyzing x2 handover in lteltea konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. Ensuring qos is one of the challenges faced by wireless network operators, which include the provision of high mobility speeds, thus the implementation of a seamless and fast handover between network cells is a prominent issue. Network architecture for lte and wifi interworking 1. Sep 05, 2014 a very interesting introduction to lte networks and specially to lte testing. Lteadvanced pro ltea pro will be used for specifications defined under 3gpps release r and release 14 r14. Handover in lte free download as powerpoint presentation. Handover is of two types soft handover and hard handover. Lte x2 handover sequence diagrams detailed message flow analysis of lte x2 handovers eventstudio system designer sequence diagram based systems engineering tool. This application note gives an introduction to lte technology, including both fdd and tdd modes of operation.
Reduced early handover for energy saving in lte networks. The 3gpp lte based handover procedure is analysed for three scenarios. We present an open source simulation model of user mobility and handover that allows investigating the performance of handover process within 3gpp lte and beyond mobile networks. Please copy the provided files in ns3 build\ lte folder. The companies are upgrading 3g technology by initializing the introduction of high speed downlink packet access hsdpa service, which increases the. In addition, the reactive handover decision policy, based on the prediction of user movement and the prediction of targetfap, is proposed as a way to eliminate frequent and unnecessary handovers. Report handover optimization lte please fill this form, we will try to respond as soon as possible. How i started worrying and fear the osi model gerdriaan mulder 31 january 2014 bachelor thesis radboud university nijmegen institute for computing and information sciences supervisor dr. Analyzing x2 handover in lte lte a konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. It permits the user equipment ue to wander between lte a wireless networks. In particular, x2 handover is introduced to allow neighboring. Hard handover mechanism is adopted to be used in lte advanced.
Alnaffouri, and mohamedslim alouini abstractnetwork densi. The text offers an introduction to the basics of lte architecture, services and technologies and includes. In order to make smooth transition from 3g to 4g the mobile communication companies are promoting super 3g lte. Radio protocols for lte and lte advanced pdf download download it once and read it on your kindle device, pc, phones or tablets. Please leave your comment if you have a question or suggestion. Introduction handover ho is key procedure for ensuring that users can move freely within. This book presents the technical characteristics of the two radio network interfaces of mobile 4g, lte and lte advanced, based on release 8, 9 and 10 of the 3gpp specifications.
Oncethehocommandhasbeen processedby theue,it leaves the source cell and stops receiving data. Wifi offload means a kind of handover or selectionreselection technology between nonwifi network and wifi network. Communications at frequencies above 10 ghz the mmwave band are expected to play a major role for the next generation of cellular networks 5g, because of the potential multigigabit, ultralow latency performance of this technology. An enhanced handover algorithm in lteadvanced network. Lte optimization engineering handbook wiley online books. Performance evaluation of received signal strength based. Due to the mobility of the users across radio cells, the high bandwidth.
A comp soft handover scheme for lte systems in high speed. This document will provide the basic concept of lte handover and the. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. In an lte network, these two enbs can directly communicate with each other via the x2 interface, which differentiates the network from its precedents 2g and 3g. The increasing demand for mobile communication calls for improvements to network operating services in terms of capacity, coverage, and quality of services qos. Consequently, high levels of interference and low sinr can be expected near the cell edge. In an lte network, these two enbs can directly communicate with each other via the x2 interface, which differentiates the. Most of the works in literature about lte security analyze authentication procedures, while handover procedures are far less considered. Therefore theres no need to sum up multiple active signals like you would say for in cdma.
A3based measurements and handover model for ns3 lte. The continuous demand for data by the ever increasing data consuming phones and wireless user equipment has necessitated the need for the deployment of densely populated small cells in future generation of cellular networks. Irat basics and interrat handover with example of wcdma rat to gsm rat handover, refer irat handover. The handover is one of the basic elements in the mobility management of long term evolution advanced lte a wireless systems. Handover is a ueassisted networkcontrolled process in that the measurement is reported by ue, and the decision is made by the network, i. When the reporting threshold condition is fulfilled, the ue sends handover measurement reports to the serving enodeb. When a ue is camped on the lte network, it would need to fallback to the legacy 2g3g networks when coverage or capacity dictates. This page describes what is ping pong ho and mentions basics of ping pong handover. Handover process in lte, lte handover tutorial teletopix.
Handover procedure and decision strategy in ltebased. 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. Lte s1 handover s1 handover lte mobile enodeb network. 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. In our implementation, we use mpls tunnels for user plane instead of gtpu protocol, which introduces a signi. It means this is mainly for ue side aspect of handover process. Dec 06, 20 the handover procedure for intra lte handover using the s1 interface is very similar to that of intra lte handover using the x2 interface, except the involvement of the mme in relaying the handover signaling between the senb and tenb. Lte s1 handover s1 handover lte mobile enodeb network core network ue target enodeb source enodeb mme sgw pgw eventstudio system designer 6 17feb14 21. Network architecture for lte and wifi interworking. In principle, the interrat handover procedures when an lte system is the source or target are the same as the handover process in lte. Interoperable ue handovers in lte radisys white paper 6 7.
Download product flyer is to download pdf in new tab. Handover is one of the key components in cellular network mobility management. Now lets jump into detailed technical aspects of lte handover. Tcp performance optimization for handover management for lte. When lte system was developed one of the big technical feature from umts softsofter handover was missing from the architecture. One of the differences is that upon handover to lte. Jun 02, 2017 lte networks prefer using the x2 interface for performing inter enodeb handovers. The 3gpp lte system has been designed to offer significantly higher data rates, higher system throughput, and lower latency for delay critical services. S1 interface based handover lte and beyond techblog on. Apr 10, 2010 apr, 2010 by lteworld in blog, handover, intra, intra eutran handover, sgw, eutran, enb, lte, mme intra eutran handover is used to hand over a ue from a source enodeb to a target enodeb using x2 when the mme is unchanged. Dl data packets are forwarded from the senb to tenb via the sgw during the handover as the sgw is not changed here. Improving tcp performance during the intra lte handover. Mar 24, 2012 the s1based handover procedure is used when the x2based handover cannot be used. As we know when mobile moves from its serving cell to the cell in the other area known as target cell, the call in progress need to be handed over to the target cell.
The senb issues a handover request message to the tenb. Points covered include a detailed description of various components of the radio interface. Pdf download handover log journal, log book 125 pgs, 8. This article proposes a comp based soft handover scheme for lte system in high speed railway, meanwhile, a cochannel deployment approach for railway communication and dual onvehicle station coordination mechanism is proposed too. In this context, one of the main goals of lte is to provide fast and seamless handover from one. You are find about lte ebooks by tag lte at an introduction to lte. Lte x2 handover in eventtriggered handover procedures, each ue evaluates the event condition every time a new.
Operators and consumers both benefit from seamless. To improve the overall capacity of the cellular network, small cells such as femtocells are currently being deployed in lte advanced network and are found to be a good. The source enodeb initiates a handover by sending handover required message over the s1mme reference point. Lte includes an fdd frequency division duplex mode of operation and a tdd time division duplex mode of operation. Lte tdd which is also referred to as tdlte provides the long term evolution path for tdscdma based networks. Intralte handover using the s1 interface 3glteinfo. It is not a new concept, but it has become hot issue recently especially after lte network is wide spread.
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. Lte ue can detect intra lte neighbors without neighbor lists which simplifies network management. A3based measurements and handover model for ns3 lte budiarto herman, dmitry petrov, jani puttonen, janne kurjenniemi magister solutions ltd. Nov 16, 2012 when the reporting threshold condition is fulfilled, the ue sends handover measurement reports to the serving enodeb. However the frequent handover caused by highspeed movement will seriously affect the performance. This procedure is performed when a ue, while still connected to the network, moves into a cell in a ta that is in the tracking area identifier tai list assigned by the network. Handover mechanisms in 3gpp long term evolution lte. A small cell is one of key factors in a long term evolution lte and lteadvanced ltea system. There is a misconception among some of the industry followers that lte systems configured to operate in unpaired lte tdd or paired lte fdd spec. This letter exploits the phenomenon of handover and presents a novel hybrid idea of reduced early handover with bandwidth expansion to achieve improved energy saving in lte networks. Lte x2 handover call flow procedure prashant panigrahi december 4, 20 4 intra lte intrammesgw handover using the x2 interface 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 mme and serving gateway sgw are unchanged. With the same unchanged ip address, the ip session continuity can be achieved. Long term evolution lte is the most recent standard in mobile communications, introduced by 3rd generation partnership project 3gpp.
The resource guide includes all the specs and information of lte networks and testing equipment and can work very. Formal verification of lteumts and ltelte handover. Enhancing lte celledge performance via pdcch icic fujitsu. Handover implementation in a 5g sdnbased mobile network. A practical systems approach to understanding 3gpp lte releases 10 and 11 radio. A topology aware skipping approach rabe arshad, hesham elsawy, sameh sorour, tareq y. It is not a new concept, but it has become hot issue recently especially after lte network is. A comprehensive resource containing the operating principles and key insights of lte networks performance optimization.