Deregistered state b occurs when the ue in state c performs handover to a nonlte network, when its request to attach to the network is rejected attach reject, or its ta update request is rejected tau. Analyzing x2 handover in lteltea konstantinos alexandris, navid nikaein, raymond knopp, and christian bonnet eurecom, biot, france email. In this context, one of the main goals of lte is to provide fast and seamless handover from one. Lte ue can detect intra lte neighbors without neighbor lists which simplifies network management. Prepare the handover command message rrc connection reconfiguration request. Reducing the effects of pingpong handover in intralte networks using fuzzy logic eng. The container includes a new c rnti, tenb security algorithm identifiers for the selected security algorithms, and may include a dedicated rach preamble and possibly some other. Allocate c rnti a new c rnti is assigned to the ue. The handover was completed in a target cell c rnti 14248 by receiving rrc connection reconfiguration complete message from ue. Evaluation of intrusion prevention technique in lte based. Lte handover latency calculation access node codeplayon. Lte security and protocol 2016 shmoocon proceedings. The container includes a new c rnti, tenb security.
Prepare the handover command message rrc connection reconfiguration request this message includes the rach preamble that needs to be sent to the terminal. Apr, 2010 by lteworld in blog, handover, intra, intra eutran handover, sgw, eutran, enb, lte, mme. C rnti cell radio network temporary identity crs cell reference symbol. Lte x2 handover between enodebs served by the same mme. Handover procedure an overview sciencedirect topics. Handover principles and handover measurements in lte. Lte jobs require excellent c programming skills, knowledge of digital communications and rf technologies, and rf testing tools. Handover preparation rrc rrc connection reconfiguration request rach preamble assignment, target c rnti, target drb id uldl, target enb as security algorithm the source enodeb sends a handover command to the ue. Lte abbreviations list 3gp 3gpp file format 3gpp third generation partnership project a. Lte3gpp standard perspectivechapter 1 introduction muhannad aulama 2. The research topic of this thesis which is lte handover performance evaluation. Long term evolution lte source enode b rrc connection reestablishment request target. This indicate a successful handover procedure for the ue.
Rnti is used, so that ue original identity can be hide, so that no one can detect the ue, but as a identity ue can also send imsi or imei, in. 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. When a ue is camped on the lte network, it would need to fallback to the legacy 2g3g networks when coverage or capacity dictates. Handover through the x2 interface is triggered by default for intralte mobility unless.
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. The cell random network temporary identifier crnti. Rnti stands for radio network temporary identifiers and guti stands for globally unique temporary ue identity. Lte long term evolution lut lookup table m m2m machine to machine mac medium access control. Lte s1 handover s1 handover lte mobile enodeb network. Ues serving mme andor sgw is changed after handover. Similar to an s1based handover, the procedure is composed of a. Evaluation of intrusion prevention technique in lte based network. The x2 interface is used to perform a handover between enodeb. Ue enodeb mme sgw pgw hss evolved nodeb serving gateway pdn gateway mobility management entity home subscriber. 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 security, protocol exploits and location tracking.
The handover was completed in a target cell c rnti 14248. Rntiradio network temporary identities are used as ue identities within the utran and in signalling messages between ue and utran. Further lte protocol exploits could potentially allow a passive adversary to locate and track devices and users. Lte kpi hindiurdu best lecture for nokia,ericsson and huawei engineers wireless communication. To gather further information on recently posted jobs. In lte, handover mobility support for ues in ecmconnected. The container includes a new crnti, tenb security algorithm identifiers for the selected security algorithms. Performance comparison of dual connectivity and hard handover for lte5g 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. If the target cell id is known by enodeb, it will proceed with the handover. Crnti, target enb security algorithm identifiers for the selected security. This page on lte rnti vs guti describes basics of rnti identifier and guti in lte system. Handover through the x2 interface is triggered by default for intralte mobility unless there is no x2 interface established or the source enb is configured to use s1based handover.
In particular, x2 handover is introduced to allow neighboring. With the introduction of lte came the development of a new radio technology based on ofdma scfdma. Lte s1 handover s1 handover lte mobile enodeb network core network ue target enodeb source enodeb mme sgw pgw eventstudio system designer 6. The x2based handover procedure is illustrated in figure 4. Kinan ghanem dr adnan motermawy dr haysam alradwan abstract improving system performance in terms of data rate, latency, mobility and cost is the scope of long term evolution lte system. Lte rnti vs gutibasics of rnti identifier and guti. C rnti is assigned by an enb to distinguish ues in a cell in rrcconnected state state c, and is valid only in the cell associated with the assigned c rnti. The container includes a new c rnti, tenb security algorithm identifiers for the selected security algorithms, and may include a dedicated rach preamble and possibly some other parameters the resources using the x2 ue context release i. Component interfaces successful handover lte mobile. Admission control with erab qos qci, arp target enb reserves rrc resource and allocates a new c rnti e. Rnti stands for radio network temporary identifier.
Handover process in lte, lte handover tutorial teletopix. Lte technology wascommercially introduced byteliasonera in norway in december2009. We look at the x2 handover signaling procedure through sequence diagrams that focus on different aspects of. Tutorial lte free download as powerpoint presentation. Lte rnti vs gutibasics of rnti identifier and guti in lte. The long term evolution lte of umts universal mobile telecommunications system is. One of the other numbers which you would very frequently come accross is rnti. A rach preamble is also included for contention free rach access. Handover command target crnti, target drb id uldl, target enb as security algorithm.
In a cellular system, handover can be defined as a procedure to transfer a user equipment ue and its context from a source cell to a target cell when source cell signal becomes bad so it handover the ue to target cell to continue the ue session. 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. Interdomain handover technologies in lte for voice volte. Request acknowledge message including a transparent container to be sent to the ue as an rrc message to perform the handover.
Lte enodebs can directly communicate with other enodebs on the x2 interface. A method, an apparatus, and a computer program product for wireless communication are provided. C rnti shortmaci measurement result from rsrp last serving cell. Pdf a lowlatency handover scheme for ltefemtocell networks. Ims is the 3gpp voice over ip solution which is being deployed in the lte networks as the voice solution. To gain further knowledge and to get impeccable scores on the interview, access lte jobs interview questions and answers page designed by experts.
This message includes information about the assigned radio resources. Rrc context including the c rnti of the ue in the source enb, asconfiguration, erab context and physical layer id of. The target enb verifies the c rnti and starts sending data packets to the ue. A lowlatency handover scheme for ltefemtocell networks. X2 handover meanwhile target enodeb allocates resources, assigns rach preamble and new c rnti to ue. Kenb from target enb c rnti cell radio network temporary identifier and kenb. One of the differences is that upon handover to lte, the entire as configuration needs to be signaled, whereas within lte it is possible to signal incremental information, where only the changes to the configuration are signaled. Pshd packet switched handover pss packet switched service primary synchronization signal. The ue sends the handover confirm message along with c rnti and an uplink buffer status report to the target enb. A procedure for switching to a radio access system having a cs domain, when a terminal sendsreceives a circuit switched communication such as voice while camped on an lte network. When the ue detects radio link problems, it starts the rlf timer, a. Interdomain handover technologies in lte for voice volte and tv phone volte esrvcc vsrvcc. This course focuses on the lte air interface and provides a detailed analysis of the structure and features of the physical layer, as well as the layer 2 and 3 protocols, before explaining how these are used in the operation of the radio link from initial attach, through service delivery and. The cell random network temporary identifier c rnti, rnti for short from here on is a phy layer identifier unique per device within a given cell.
C rnti to confirm the handover to the target enb to indicate that the handover procedure is completed for the ue. Dl c rnti based pdsch bler and a system informationradio network temporary identifier sirnti based pdsch. Hho hard handover hlc high layer compatibility hlr home location register hn home network ho handover. It is the third generation partnership project3gpp. When the reporting threshold condition is fulfilled, the ue sends handover measurement reports to the serving enodeb.
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