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. Report handover optimization lte please fill this form, we will try to respond as soon as possible. In an lte network, these two enbs can directly communicate with each other via the x2 interface, which differentiates the. Configsetdefault ns3ltehelperusepdschforcqig eneration. First, features related to handovers on s1 protocol will be discussed, followed by detailed procedures of s1. Performance analysis of handover measurements and layer 3 filtering for utran lte. We propose in section v the x2ap eps extension implemented in ns3 before detailing in section vi, based on x2ap functionalities, a mlb algorithm implementation for lte.
Opnet lte simulation mobile communication systems are deployed as a natural evolution of gsm global system for mobile communications and umts universal mobile telecommunications system. The ns3 lte module by the lena project nicola baldo nicola. In the 3gpp lte system, the one of the important technologies is handover. Ericsson research isafjordsjgatan 14 e, 146 80 stockholm, sweden.
Mar 24, 2012 the s1based handover procedure is used when the x2based handover cannot be used. Network architecture for lte and wifi interworking. This research focuses on intra lte handover which occurs using interface x2 to move an eu between two. Simulation of lte 5g tight integration in ns3 in order to assess the performance of both schemes, we. Network architecture for lte and wifi interworking 1. Jun 02, 2017 lte networks prefer using the x2 interface for performing inter enodeb handovers. This event type can also be used for interfrequency handover and it is configurable in enodeb side to choose the event type for interfrequency. Lte s1 handover s1 handover lte mobile enodeb network core. Our research group dei university of padova mainly focuses on mac layer harq allocation scheduling, lte module for ns3 browse mobilitydocuments at. Ns3 lte is used for both radio and core network evolution.
In this context, one of the main goals of lte is to provide fast and seamless handover from one. Design principles and performance konstantinos dimou. 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. A multicriteria decision framework for network selection over lte and wlan. Jun 03, 2017 lets examine the x2 handover in detail. 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. Before discussing about why lte skipped soft handover and only implemented hard handover, lets check the basic concept of. Also, we offer lte simulation s3 projects based on acm paper give detailed knowledge about recent development of cellular technologies.
Handover between lte and 3g radio access technologies. Radio protocols for lte and lte advanced pdf download download it once and read it on your kindle device, pc, phones or tablets. Pdf handover mechanism for devicetodevice communication. The mmwave module for ns3 can be used to simulate 5g cellular networks at mmwave frequencies.
Ns3 lte specifications are very stable, with the added benefit of enhancements having been introduced in all subsequent 3gpp releases. May 23, 2014 when lte system was developed one of the big technical feature from umts softsofter handover was missing from the architecture. An open source model for the simulation of lte handover scenarios and algorithms in ns3 conference paper pdf available november 20 with 3,042 reads how we measure reads. Effect of aqmbased rlc buffer management on the enb. Pdf an open source model for the simulation of lte. Ims is the 3gpp voice over ip solution which is being deployed in the lte networks as the voice solution. 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. Intralte handover using the s1 interface 3glteinfo. In particular, x2 handover is introduced to allow neighboring. Pdf in this paper, we present an open source simulation model for the ns3. May 08, 2016 after the ho command rrc connection reconfiguration, with mobility control info ie, you can see the target cells sib 1 reading in the ue logs. The tenb checks for resource availability and, if available, reserves the resources and sends back the handover request acknowledge message. Test measurement challenges and field environment test planning school of electrical engineering master. An enhanced handover algorithm in lteadvanced network.
Lpwan radio technology standard that uses a subset of the longterm evolution lte specification issued by the 3rd. Performance comparison of dual connectivity and hard handover for lte 5g tight integration in mmwave cellular networks supervisor master candidate michele zorzi michele polese university of padova cosupervisor marco mezzavilla new york university academic year 20152016 arxiv. Points covered include a detailed description of various components of the radio interface. Intrafrequency handover means mobility in connected mode between two different cells, but within same lte frequency, this topic will be assigned for event a3 which is used for lte intrafrequency handover. Description download handover optimization lte comments. We look at the x2 handover signaling procedure through sequence diagrams that focus on different aspects of the procedure. 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 ultradense network udn has emerged as a key enabler in enhancing the capacity of. Lte abbreviated as long term evolution composed of simple architecture and less number of network elements.
A3based measurements and handover model for ns3 lte budiarto herman, dmitry petrov, jani puttonen, janne kurjenniemi magister solutions ltd. As a result, we checked again that the ue should do handover quickly. Nov 16, 2012 when the reporting threshold condition is fulfilled, the ue sends handover measurement reports to the serving enodeb. Handover mechanism for devicetodevice communication. Ray tracing and measured traces can also be modeled. It is not a new concept, but it has become hot issue recently especially after lte network is wide spread. Ns3 lte simulation projects lte projects using ns3. From old enb to new enb, with or without using new mmesgw, with or without using x2 interface, and so on. Section iii presents the handover triggering long term evolution lte system within its release 8 1, procedure and the involved triggers, as well as their impact 2. We analyze lte network performance by ns3 simulation tool.
Performance analysis of handover measurements and layer 3. Lte x2 handover in eventtriggered handover procedures, each ue evaluates the event condition every time a new. Handover principles and handover measurements in lte. In lte network, users can move freely in the network through fast and seamless handover ho. Lte is a 4g technology also with download speeds that run the gamut from 3 to 28 mbps worldwide. Bit rate gbr video traffic is downloaded from the source to the target. This procedure may relocate the mme andor the serving gw. On top of these features, the lte handover procedure is modeled, following. Ns3 is also the best choice among network simulator for simulating lte framework. Support of a wide range of channel models, including the latest 3gpp model for frequency spectrum above 6 ghz.
We design 4g based network application and models are implemented by ns3 simulation. Through the ns3 simulation, we found the handover starting point and starting time according to ues speeds. Keywords handover, long term evolution, measurement events, open access femtocells. 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. Our research group dei university of padova mainly focuses on mac layer harq allocation scheduling, mobility, traffic modelization, creation of multimedia applications, mimo. Tcp performance optimization for handover management for lte. Lte ue can detect intra lte neighbors without neighbor lists which simplifies network management. When the reporting threshold condition is fulfilled, the ue sends handover measurement reports to the serving enodeb. Overview of x2 handover 1, we have discussed the procedures related to an x2 handover that is performed solely by two enbs this document will focus on procedures for an s1 handover performed between two enbs with intervention of epc. Lte s1 handover s1 handover lte mobile enodeb network. 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. In the world, the number of 3gpp lte long term evolution phone users grows 900 million in 2015, which is % growth compared to 510 million in 2014 1.
Each enb is serv ing one ue performing tcp file download from the remote. The senb issues a handover request message to the tenb. The example uses the round robin scheduler rrffmacscheduler that has been slightly modi. The radio interface is termed enhanced utra e on ho performance. Today we will be talking about handovers from eutran to utran, from 4g to 3g. If the target cell id is known by enodeb, it will proceed with the handover. 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. Mar 30, 2012 few last articles were about handover in lte network. Comparison between measurement events for lte handover. We look at the x2 handover signaling procedure through sequence diagrams that focus on different aspects of. The existing implementation of mih in ns3 2 has been ported from ns3. Comparison between measurement events for lte handover in. Pdf on oct 1, 2015, ehab ahmed ibrahim and others published study of lte r x2 handover based on a3 event algorithm using matlab find, read and cite all the research you need on researchgate. Ns3 lte stands for long term evolution, and isnt as much a technology as it is the path followed to achieve 4g speeds.
A comp soft handover scheme for lte systems in high speed. A3based measurements and handover model for ns3 lte. Pdf an open source model for the simulation of lte handover. 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.
Implementation of media independent handover ieee 802. 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. There are many specific reasons why lte dropped altogether soft handover connectbeforebreak from the system design. Contribute to sreekanthj93lte handover development by creating an account on github. X2based handover performance in lte ultradense networks using ns3. Oncethehocommandhasbeen processedby theue,it leaves the source cell and stops receiving data. Analyzing x2 handover in lteltea konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. In a cell, interrat handover can only be triggered by 3a or 3c event, which is controlled by interrat handover tactic rathotactic.
This module builds on top of the lte one, and currently includes features such as. Analyzing x2 handover in lte lte a konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. Start reading radio protocols for lte and lte advanced on the free kindle. Modeling, implementation and performance analysis of mobility load. Handover in lte lte telecommunication transmission. While the lte handover procedures defined in release 8 provide mobility support, they. Performance comparison of dual connectivity and hard. Mobility load balancing based adaptive handover in downlink lte selforganizing networks. Ue is handed over using an s1 handover if the x2 interface is not available between the source and target enodebs. Many simulation scenarios in various research projects rely on user mobility. Lte simulation ns3 projects long term evolution lte an universal mobile telecommunication system in cellular technology. Pdf mobility load balancing based adaptive handover in. This form of handover is supported within gsm and a neighbour list was established to enable this occur easily.
An s1 handover is a fallback for scenarios where x2 interface is not available. Wifi offload means a kind of handover or selectionreselection technology between nonwifi network and wifi network. This and two subsequent documents will discuss the handover procedure required when a ue, still being served through the lte network it accessed, disconnects from its current serving cell, and connects to a new serving cell within the same tracking area ta as the ue travels as defined as emm case no. Interoperable ue handovers in lte radisys white paper 6 7. In section iv we provide a simulation model description of the lte system adopted in this paper. 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. Please copy the provided files in ns3 build\ lte folder. A multicriteria decision framework for network selection over lte. Ns3 lte simulation is also the latest highspeed cellular transmission network. Susannaruthimplementationofmediaindependenthandover.
Lte x2 handover sequence diagrams detailed message flow analysis of lte x2 handovers eventstudio system designer sequence diagram based systems engineering tool. At runtime, in debugging builds, if this condition is not true, the program prints the source file. Pdf x2based handover performance in lte ultradense. This document will describe the procedure for s1 handovers performed in an intralte environment, as defined as emm case 6 in our technical document, eleven emm cases in an emm scenario. The source enodeb initiates a handover by sending handover required message over the s1mme reference point. Before discussing about why lte skipped soft handover and only implemented hard handover, lets check the basic concept of softsofter handover. Handover process in lte, lte handover tutorial teletopix. Source enodeb hands over ue data flow to the target enodeb over the x2 interface.
Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. You are find about lte ebooks by tag lte at an introduction to lte. When only ps service exists, adopt cell reselection process of ps service handover. When lte system was developed one of the big technical feature from umts softsofter handover was missing from the architecture. However the frequent handover caused by highspeed movement will seriously affect the performance.
Finally, we used detailed and extensive ns3 9 realistic simulation to simulate the effect of. Handover in lte free download as powerpoint presentation. X2 handover is performed between a source enb and a target enb through the x2 interface. Sorry guys, today i dont have time to create abstract picture which we could use to start from. Abstractthis paper presents a long term evolution lte handover algorithm implementation based on reference signal received power rsrp measurements and event a3 on top of the lte module of ns3 network simulator.
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. Miesm bler curves integration of the bler curves in the ns3 lte module. In this paper, we present an open source simulation model for the ns3 simulator that allows the simulation of lte handover scenarios, to support the design and evaluation of handover decision. S1 interface based handover lte and beyond techblog on. Please leave your comment if you have a question or suggestion. Machine learning based handover management for lte. Dl data packets are forwarded from the senb to tenb via the sgw during the handover as the sgw is not changed here. Radio protocols for lte and lte advanced pdf download. We provide lte network with higher performance backwards compatible. Lte is a 4g wireless technology that verizon wireless and numerous leading wireless carriers have chosen as their upgrade path beyond 3g technologies.
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