Epdg lte handover pdf

The epdg supports interaccess handovers between two different interfaces. In gsm, the architecture relies on circuitswitching cs. Pdf this document provide maps about 3gpp network nodes and interfaces. 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. 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. Performance analysis and deployment of volte mechanisms. In particular, x2 handover is introduced to allow neighboring. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. The affirmed wifi gateway solution features complete twagtwap and epdg.

Wo2017114932a1 assisted handover to volte in case of. Wo2017114932a1 assisted handover to volte in case of vowifi. Wifi calling course description often associated with volte voice over long term evolution, wifi calling is the means by which service providers can support seamless mobility between the lte. Optimized handover procedures and protocols between eutran. Handover sgw mme source target enb enb enb enb sgw ue ue moving enb enb enb enb inter eutran and sgw handover intra eutran handover pgw related blogs basic requirement of handover ue ip address should not be changed packet loss and. The mavenir evolved packet data gateway epdg is a standards based commercially proven network component that provides secure, cost efficient integration of wifi access into the lte operators evolved packet core epc while maintaining seamless mobility ie handover of active sessions and voice calls between wifi and lte networks for. When the device attaches with the lte network, it performs i. A horizontal handover occurs when a mobile node switches from one cell tower to another cell tower, depicted by the dotted enodebs in figure 1. This article looks at the evolved packet core epc, the core network of the lte system, giving an overview of the architecture of the core network, describing some of its key elements.

Pdf enhanced handover mechanism in long term evolution lte. An s1 handover is a fallback for scenarios where x2 interface is not available. The epc is the latest evolution of the 3gpp core network architecture. It based on the epc epdg, singlesdb 3gpp aaa, and ims as the core control architecture. When the epdg is deployed on the home network, the following services are unavailable to vowifi subscribers.

Lte networks prefer using the x2 interface for performing inter enodeb handovers. In case of handover especially when the lte bearer is torn down after sending create session response the downlink traffic shall be sent over the wlan so this becomes even more important to buffer data on epdg avoiding any traffic loss. Lte x2 handover sequence diagrams detailed message flow analysis of lte x2 handovers eventstudio system designer sequence diagram based systems engineering tool. This paper investigates the improvement steps for ho mechanisms in long term evolution lte system. With lte, there is the additional challenge of moving from circuitswitched voice to voice over lte volte, to deliver a strong voice experience, 4g, coverage needs to be almost ubiquitous not in near term reach for a large number of mnos. Jun 02, 2017 lte networks prefer using the x2 interface for performing inter enodeb handovers. Lte s1 handover s1 handover lte mobile enodeb network. Handover procedure in lte network gls maps designed for x2 application protocol x2ap is used to coordinate handovers and perform load management between enodeb evolved node b network elements source enodeb and target enodeb. Mavenir epdg key benefits software solution for evolved. Pdf mobile interface 3gpp interfaces description general. Ims profile for voice, video and sms over untrusted wifi.

Interoperable ue handovers in lte radisys white paper 6 7. The senb issues a handover request message to the tenb. A vowifi service monitor monitors the logical data path to the epdg of a mno as an indication of whether vowifi service is possible for subscribers of the mno network. Unlicensed integration with 5g networks wireless broadband. S1 handover is used when the direct x2 interface is not available.

Network architecture for lte and wifi interworking lte overview. Signalling tester lte a 3ca4ca tests with 8 tx and 4 rx rf signals up to 6 ghz. The process of switching from one radio transceiver to another horizontal handover. It also mentions wlanwifi to lte handover with message flow diagram. Points covered include a detailed description of various components of the radio interface. The approach discussed so far provides a mechanism for seamless handover between wifi and lte networks.

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. And, while you may have already invested heavily in building out your network, chances. Section iii describes the lte interworking requirements and explains and analyses the lte interworking with different wireless networks. Due to the standard configuration of ues in preferring wlan connectivity over lte cellular connectivity, if the vowifi service is unavailable the ues will not automatically switch to volte while a wlan connection is available. Lte x2 handover in eventtriggered handover procedures, each ue evaluates the event condition every time a new. Though there are various reasons, i documented here three causes why soft handover was omitted from lte. Lte in the unlicensed spectrum 5 mobile data traffic grew another 75% in 2015 o from 2. In this paper, a generalized model is proposed to analyze the impact of propagation environment and velocity on the handover performance of user equipment ue for long term evolution lte systems. Enhanced handover mechanism in long term evolution lte networks. When ue is offloaded from lte the ip address provided in lte to ue.

Lwa lte wlan aggregation user plane architecture in the downlink, the enb may schedule pdcp pdus of the same bearer to be delivered to the ue either via. Dl data packets are forwarded from the senb to tenb via the sgw during the handover as the sgw is not changed here. Enhanced packet data gateway epdg, untrusted non3gpp accesses, wifi hotspot, ipsec. Wo2016037642a1 handover from 3gpp to untrusted non3gpp. Architecture for optimized handover between cdma ev. Handover between two di erent wireless technologies, such as lte and wifi. Physicalcommunication32010217244 219 table 1 lte, lte advanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul.

In this context, one of the main goals of lte is to provide fast and seamless handover from one. The smec lte epdg evolved packet data gateway is designed to provide seamless integration of wifi as a subset of lte ran with purposebuilt hardware platform andor scalable cots server based platform which provides mobile operators with the capability to securely and cost effectively integrate untrusted wifi networks to the mobile packet core, including ims core networks, using 3gpp epdg. Sep 24, 2015 we use your linkedin profile and activity data to personalize ads and to show you more relevant ads. This paper is demanded to study handover based on x2 interface in lte network. Lte s1 handover sequence diagrams s1 interface connects enodebs to the mme. Nov 06, 2016 lets discuss why lte does not have soft handover as in wcdma and cdma systems. Eutran, to an untrusted wireless local area network 103, e. Handover preparation the x2 handover procedure is performed without evolved packet core epc involvement, i. How is handover from volte to vowifi achieved with no. Test focus on qos class identifier qci integrity 4. A call established over volte, and then the voice gets offloaded to vowifi.

Handover within a wireless technology, such as the switch from access point to access point in wifi, or the switch from one cell tower to another in lte. In contrast to looking to solve mobility with singlepath like switchedhandover capabilities. After handover to cdma2000, the lte access behaves as if the. Its basis stands in the gsmedge and umtshspa network technologies, with changes in terms of an increased capacity and higher speed by simplifying the core network and using a different radio interface. Handover in lte lte telecommunication transmission. Ueepdginitiated detach procedure and uerequested pdn disconnection with.

Wifi offload monitoring enabling costeffective data growth ensure subscriber wifi experience to encourage adoption and savings as an lte operator, you live on the front lines of unprecedented and continued data traffic growth. Lte qos lte architecture supports hard qos, with endtoend quality of service and guaranteed bit rate gbr for radio bearers. Consequently, the ats cannot report handover events between wifi and lte networks. Analyzing x2 handover in lteltea konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. In this paper, the handover process describes takes the. Jun 03, 2017 lte enodebs can directly communicate with other enodebs on the x2 interface. Pdf study of x2 handover in lte network using matlab. Handover process in lte, lte handover tutorial teletopix. 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. The method of determining whether to perform handover of a mobile terminal 101 in a wireless communications. A call established over vowifi, and then the voice gets onloaded to volte. Following is the overall and simplest form of lte lte handover procedure. Ltewifi handover strangelove gerdriaan mulder institute for.

Lte longterm evolution this section explains what lte is and the components which it consists of, in order to get an understanding of the technology and how horizontal handovers are facilitated. Long term evolution lte is the next generation 3gpp radio access network evolved umts terrestrial radio access network eutran system architecture evolution sae is the 3gpp next generation standard for mobile networks providing. The pgw identity of all the allocated pdn gateways, as well as information that identifies the plmn in which the pgw is located, are returned by the 3gpp aaa server during the authorization. Pdf dynamic handover control parameters for ltea5g. The main component of the sae architecture is the evolved. The messaging in x2 handover is detailed in lte x2. Lte x2 handover between enodebs served by the same mme. Lte enodebs can directly communicate with other enodebs on the x2 interface. The huawei sdk based app vowifi implements handovers to lte networks and wifi to umts handovers. Wifi calling has emerged as a way to extend coverage and improve capacity, especially. The continuing importance of voice in the carrier model. Intralte tau and interenodeb handover without serving gw relocation. The present invention relates to managing wireless communication services and in particular to a method and apparatus for controlling device handover between wlan and cellular service access.

Pdf on nov 1, 2018, abdulraqeb alhammadi and others published dynamic handover control parameters for lte a5g mobile communications find, read and cite all the research you need on. Sep 12, 20 this is not plain lte mobility or lte handover to 3g, which qualcomm technologies chipsets have supported ever since the first lte networks launched, but the first truly connected lte tdd time division duplex and fdd frequency division duplex handover mobility, now commercial with the samsung galaxy s4 and galaxy s4 mini on the optus 4g lte. Lte s1 handover s1 handover lte mobile enodeb network core. Page but before we start more traffic, faster, everywhere. Lte tutorials and call flows long term evolution signaling flows and tutorials for lte protocol layers. The tenb checks for resource availability and, if available, reserves the resources and sends back the handover request acknowledge message.

Browse over 50 online courses in our course catalogue, or get in touch to register your interest in future live onsite courses when we are able to safely resume in person training. Increased bandwidth endtoend ip simplified architecture. 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. Handling of epdg selection based on the country the ue is located in. Given the current global situation, we have paused the delivery of our live onsite courses, but our live online and online anytime packages remain unaffected. The x2 interface is used to perform a handover between enodeb. Horizontal handovers in both lte and wifi networks are discussed, to. Introduction handover ho is key procedure for ensuring that users can move freely within.

Iwlan with epdg whether a non3gpp access is trusted on nontrusted is an operators decision i. The long term evolution standard lte is a wireless communications, highspeed data standard for mobile phones and data terminals. While 4g and lte have captured much of the media attention, wifi has quietly. Interoperability with nextgeneration ofdmbased mobile. Just as ethernet and the internet have different types of qos, for example, various levels of qos can be applied to lte traffic for different applications. The sae has a flat, allip architecture with separation of control plane and user plane traffic. Lte in the unlicensed spectrum 4 mobile data traffic grew another 75% in 2015 o from 2. This form of handover is supported within gsm and a neighbour list was established to enable this occur easily. May 31, 2016 in case of handover especially when the lte bearer is torn down after sending create session response the downlink traffic shall be sent over the wlan so this becomes even more important to buffer data on epdg avoiding any traffic loss. Ims wellknown apn is subject of handover from wifi to lte, utran and. Now lets jump into detailed technical aspects of lte handover. Handover procedure in lte network has been intensely advanced when compared to the earlier 3gpp criteria. Because the lte mac is fully scheduled, qos is a natural fit.

Test focus on session border management routing between epcims and other networks 3. Physicalcommunication32010217244 219 table 1 lte,lteadvanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul. The invention relates to a mobile terminal 101,105 and a method of determining whether to perform handover of the mobile terminal in a wireless communications network from a radio access network 102, e. Due to huge increase of data traffic, telecom operators are adopting technologies like lte, lte advanced. Handover performance in 3gpp long term evolution lte. We use your linkedin profile and activity data to personalize ads and to show you more relevant ads. 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.

It means this is mainly for ue side aspect of handover process. The lte epc architecture epdg in the interworking architecture briefly. 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. System architecture evolution sae is the core network architecture of 3gpp s lte wireless communication standard. Selfoptimization of handover parameters in lte networks. Performance analysis and deployment of volte mechanisms over. Sae is the evolution of the gprs core network, with some differences. Two types of handover procedure in lte for ues in active mode the. Wifi offload means a kind of handover or selectionreselection technology between nonwifi network and wifi network. Selfoptimization of handover parameters in lte networks veronique capdevielle, afef feki alcatellucent belllabs, france email. 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. It is not a new concept, but it has become hot issue recently especially after lte network is wide spread. This helps in avoiding manual intervention from admin to cleanup calls. Mobile interface 3gpp interfaces description general map sae lte map.