Jun 02, 2017 lte networks prefer using the x2 interface for performing inter enodeb handovers. The ue sends an hrpd traffic channel complete tcc message to the hrpd network over the hrpd radio link. In principle, the interrat handover procedures when an lte system is the. Handover performance in 3gpp long term evolution lte systems. Introduction handover ho is key procedure for ensuring that users can move freely within. Enables inter technology handoff between lte and evdo networks. The following example will describe soft handover for best case scenario. Lte ue and service differentiation m8023 lte handover to. Interoperability with nextgeneration ofdmbased mobile.
Introduction to evolved packet core epc and evolved packet system eps 2. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a specific network drive within etsi secretariat. Pdf hard handover mechanism is adopted to be used in 3gpp long term evolution 3gpp lte in order to reduce the complexity of the lte. Lte ue can detect intra lte neighbors without neighbor lists which simplifies network management. Interdomain handover technologies in lte for voice volte and tv phone ntt docomo technical journal vol. Lte is a trade mark of etsi currently being registered. Support the ability to trigger a handover to the non 3gpp system. Feature group indicators fgi bits feature group indicator fgi is a special information element ie within ue capability information message.
Lte overview lte telecommunication mobile technology. Selfoptimization of handover parameters in lte networks veronique capdevielle, afef feki alcatellucent belllabs, france email. The s101 interface is required to perform procedures related to optimise ho between the eutran access and cdma2000 hrpd access to allow for preregistration and handover signalling with the target system. For measurements within eutran at least two basic ue measurement quantities shall be supported. Drive testing provides an accurate realworld capture of the rf environment under a particular set of network and environmental. We look at the x2 handover signaling procedure through sequence diagrams that focus on different aspects of the procedure. In particular, x2 handover is introduced to allow neighboring. Before describing the above scenario we need to know three important terms. Enhanced intercell interference control icic for noncarrier aggregation ca based deployments of heterogeneous networks for lte. Lte sim is presented to provide a complete performance verification of lte networks. Optimizing handovers in enterprise small cell lte networks mro page 5 practical example of handover too early figure 4. The hrpd signaling is forwarded transparently by the eutran and mme between the ue and the hrpd rnc. Handover procedure an overview sciencedirect topics. User information is sent all the cell belongs to active set.
Here i write on how interrat mobility performs in lte, means handover to lte and mobility from lte. Enhanced approach for rsrp based handover in lte scenario. In this context, one of the main goals of lte is to provide fast and seamless handover from one. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. Systems and methods according to these exemplary embodiments provide for selectively transmitting a preregistration, reregistration or deregistration initiation message associated with handing off user equipment between different access systems, e.
Request pdf handover performance in 3gpp long term evolution lte systems the specification of the long term evolution lte of 3g systems is currently. Lte mobility enhancements 1220079 page 4 the target cell for handover, but not good enough for the ue to be able to decode the handover command from the source enb1. Epc components serving gateway sgw, pdn gateway pgw mobility management entity mme, policy and charging control function pcrf 4. The tenb checks for resource availability and, if available, reserves the resources and sends back the handover request acknowledge message. Before discussing about why lte skipped soft handover and only implemented hard handover, lets check the basic concept of softsofter handover. An s1 handover is a fallback for scenarios where x2 interface is not available. Handover in lte lte telecommunication transmission. Hrpd high rate packet data hsgw hrpd serving gateway. 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. Now lets jump into detailed technical aspects of lte handover.
The s103 interface is defined between the serving gw and hrpd pdsn and supports the forwarding of dl data. Analyzing x2 handover in lteltea konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. Optimising handovers in enterprise small cell lte networks. This form of handover is supported within gsm and a neighbour list was established to enable this occur easily. 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 x2 handover in eventtriggered handover procedures, each ue evaluates the event condition every time a new. Incall handover using manual and automatic triggers. However, the hard handover may result inefficient lte performance i. If some ue fails in some protocol testing like handover, a specific type of measurement etc, it would be a good practice to check this information from ue and. It supports single and heterogeneous multicell environments, qos management, multiuser environments, user mobility, handover procedures, and frequency reuse techniques.
Enhanced approach for rsrp based handover in lte scenario aparna l, agoma martin abstract hard handover decided by handover margin hom and time to trigger ttt has been adopted in third generation partnership project 3gpp lte with the purpose of reducing the complexity of network architecture. By selecting lte job as your career, you can surpass your limitations. If the target cell id is known by enodeb, it will proceed with the handover. Improvement of lte handover performance through interference. In the future, voice and tv phone services will also be provided in lte by way of. Supported logical network interfaces reference points thehsgwsupportsmanyofthestandardsbasedlogicalnetworkinterfacesorreferencepoints. Pdf of the x coordinate of all users in one simulation 191. The hsgw in hrpd access network sends proxy binding update pbu to pdn gw in eutran, to establish pmipv6 tunnel with the pgw that the ue is associated with. Optimized performance evaluation of lte hard handover algorithm with average rsrp constraint.
Long term evolution lte is a complementary nextgeneration broadband wireless technology for all mobile. Jun 03, 2017 lets examine the x2 handover in detail. Reference symbol received power rsrp eutra carrier received signal strength indicator rssi in lte eutran measurements performed by a ue for intrainterfrequency mobility can be controlled by enb, using broadcast or dedicated control. Handover principles and handover measurements in lte. Lte x2 handover sequence diagrams detailed message flow analysis of lte x2 handovers eventstudio system designer sequence diagram based systems engineering tool. Imsi international mobile subscriber identity ios interoperability specification ip internet protocol lte long term evolution meid mobile equipment identity mme mobility. The s1based handover procedure is used for communicating with non3gpp specific access technologies such as. May 23, 2014 when lte system was developed one of the big technical feature from umts softsofter handover was missing from the architecture. Everybody who has experience with dealing with field trouble would know that this is never ending story, regardless of whether it is ue side issue or network side issue. Lte core functions and service procedures core network functions. Handover process in lte, lte handover tutorial teletopix. Wifi offload means a kind of handover or selectionreselection technology between nonwifi network and wifi network. In the lte hrpd direction there are two distinct steps 1 preregistration.
Wisdom jobs let you make decisions that benefit your longlife career. Handover in lte is purely hard handover both s1 and x2 interface handover. Selfoptimization of handover parameters in lte networks. The proposed algorithm makes no alteration in tcp function and the standard lte intra handover procedure.
Do you want to work as professional at a high standard organization. Interoperability with other radio access technologies rats is possible at the ip level. Lte voice call handover free download as powerpoint presentation. 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.
Following is the overall and simplest form of lte lte handover procedure. Handover from lte is performed only after security has been activated. The use of hard handover reduces the complexity of the lte network architecture. Lte ue and service differentiation m8023 lte handover to ehrpd per ehrpd from aa 1. 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. Though there are various reasons, i documented here three causes why soft handover was omitted from lte. So when we say wifi offloading, it usually mean that wifi offload handover between lte network and wifi network. High rate packet data and long term evolution systems eat new protocolids and. Handover between lte and 3g radio access technologies. Lte ue and service differentiation m8023 lte handover to ehrpd per ehrpd bandclass m8025 lte qos measurements m8026 lte handover rlf triggerm8027 lte mac measurements m8029 lte mbms m8030 lte sinr m8031 fdd only lte mro utran frequency related m8032 lte mobility events m8033 lte eutra carrier frequency m8034 lte s1 sctp. Nov 16, 2012 when the reporting threshold condition is fulfilled, the ue sends handover measurement reports to the serving enodeb. Architecture for optimized handover between cdma ev.
Interdomain handover technologies in lte for voice volte. Procedure for handover of lte is largely the same as the handover procedure in lte. Pdf optimized performance evaluation of lte hard handover. The contents of the present document are subject to continuing work within the. Lte voice call handover internet protocols digital. Us83314b2 dormant session management associated with. Lte sim encompasses several aspects of lte networks, including both eutran and eps. Lte s1 handover s1 handover lte mobile enodeb network core.
In the eutran to hrpd direction, there is no time limit of how long a ue may be preregistered in the hrpd system before the handover takes place. The research topic of this thesis is handover from lte to 3g cellular networks. It is not a new concept, but it has become hot issue recently especially after lte network is wide spread. Lte or long term evolution is defined as a base for highspeed wireless communications for data terminals and mobile devices that are based on the gsm, cdmawcdma, umtshspa, and edge. Handover performance of long term evolution lte networks have been studied before in the literature, which mostly rely on computer simulations 6 9. 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. Local anchor point for interenb handover and inter3gpp mobility.
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. 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. Lte or long term evolution is defined as a base for highspeed wireless communications for data terminals and mobile devices that are based on the gsm, cdmawcdma, umtshspa, and edge technologies. It means this is mainly for ue side aspect of handover process.
I n t e r n a t i o n a l t e l e c o m m u n i c a t i o n u n i o n itut technical paper telecommunication standardization sector of itu. Lte overview free download as powerpoint presentation. Scribd is the worlds largest social reading and publishing site. There are many specific reasons why lte dropped altogether soft handover connectbeforebreak from the system design. In the case of circuitswitched fallback to cdma2000, the procedure includes support for parallel handover i. The ue retunes to the hrpd radio access network to acquire ehrpd radio link. Lte hrpd one call flow of dozens 31 tellabs 2102011 1. Nov 06, 2016 lets discuss why lte does not have soft handover as in wcdma and cdma systems. The main difference is that the handover to lte as a wholeconfiguration must be signaled, and the lte it is possible to use signaling delta, according to which only the changes in the. Lte s1 handover s1 handover lte mobile enodeb network. Handover mechanisms in 3gpp long term evolution lte. Hrpd a provider ctia handoff demonstration lte dora usb cdma evdo rev a phone with mobile ip client internet linux application processor with mobile ip client rtsp server linux router with mobile ip home agent iterated mobile ip enables intersystem. The approach discussed so far provides a mechanism for seamless handover between wifi and lte networks. The senb issues a handover request message to the tenb.
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. In long term evolution lte, as with other cellular technologies, drive testing is a part of the network deployment and management life cycle from the early onset. Lte etsi 650 route des lucioles f06921 sophia antipolis cedex france. Did you set your sights on telecommunication filed. Two types of handover procedure in lte for ues in active mode the. Architecture for optimized handover between cdma evdo1x.
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