Rrc connection mobility including intrafrequency and interfrequency handover, associated security handling, i. Rre shared between wcdma and lte systems yoshitsugu shimazu0 shingo suwa0 masayuki motegi0 takayuki watanabe0 ntt docomo plans to initiate lte services at the end of 2010, and for part of some base station equipments, ntt docomo has developed rre capable of supporting both wcdma and lte systems, and began commercial. Ue capability information and rrc connection reconfiguration. Would you like to find out more about lte, but have little time to devote to it. Rrc connection establishment involves signaling radio. But one should note, that some radio management functions scheduling, physical resource assignment for physical channels are handled by layer 1 and layer 2. Rrc connection establishment in lte all about wired and.
Paging is a generic term and its also used in lte, so i thought about writing a small but not detailed article on paging, its uses and how physical layer is involved in paging process. Rrc connection procedures is used to establish an rrc layer connection between the ue and utran. A study of the radio resource control connection re. Protocol specification eventstudio system designer sequence diagram based systems engineering tool. Relevant for testing harq retransmission protocols, power control, adaptive modulationcoding. Finally, chapter 5 will summarize all the security keys covered in the lte security technical document lte security i and ii. Radio bearer configuration these procedures are executed upon request by higher layers and the parameter configuration is based on qos. A subsequent rrc connection reconfiguration procedure is used to resume operation on radio bearers other than srb1 and to reactivate measurements. Rrc, rab, lte, volte, rrc connection and rab example, utran. In this document, we will explain nas and as security setup procedures to be performed based on k asme, and how data are transmitted in. Sep 14, 2015 4g lte kpi key performance indicators training course what are lte kpis by telcoma global duration.
During the lte initial attach procedure, the mobile equipment identity is obtained from the ue. View notes 19080432 rrc procedures in lte commentsv1 from cse 570 at stony brook university. Attach procedure may trigger one or multiple dedicated bearer establishment procedures to establish dedicated eps bearer for that ue. Additionally, nbiot uses the concept of repetitions and signal combining techniques to improve. Rrc connection release in lte redirectedcarrierinfo loadbalancingtaurequired, csfallbackhighpriority. It is used to keep track of the radio link condition so that appropriate steps can be taken if radio link failure rlf is declared.
Rrc vs rab difference between rrc and rab in umts,lte. Lte is the latest generation of the 3gpp standards. Rrc connection reconfiguration for measuring the second cell. The figure below taken from tdoc r23859 captures the rlm process. It is not possible in this blog to explain all the. Initial security activation procedure in 3gpp ts 36. Aug 07, 2012 the rrc protocol for eutran is responsible for the basic configuration of the radio protocol stack. Rrc connection setup message include default configuration for srb1 but can also include configuration information for pusch, pucch, pdsch physical channels, cqi reports, sounding reference signal, antenna configuration and scheduling requests. Myung 2 beyond 3g international mobile telecommunications imt2000 introduced global standard for 3g. This page on rrc vs rab describes difference between rrc and rab terms used in umts and lte.
Narrowband iot data transmission procedures for massive. Radio link monitoring rlm is one of the important procedures in lte. The connection establishment progresses through the following phases. Theory and practice of rrc state transitions in umts networks. The rrc connection release message is used to command the release of an rrc connection. Data transmission procedures for iot in lte, the transmission of data packets requires an established radio resource control rrc connection between the device and the evolved nodeb enb. Dec 02, 20 difference in rrc procedures lte and 3g slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Utran procedures elementary procedures paging rrc connection setup transaction reasoning authentication and security control transaction setup with rab allocation transaction clearing and rab release rrc connection release rrm procedures radio link addition and deletion intersystem handover from umts to gsm.
Lte attach procedure call flowbreak the big picture into small steps. Rethinking rrc state machine optimization in light of recent advancements theodore stoner university of cincinnati theodore. A rudimentary first version of 3g3t was recently used to discover network parameters and demonstrate the feasibility of the approach 6. If nas messages are encapsulted in rrc messages, lterrc calls naseps dissector. Eps attach type value octet 1 bits 3 2 1 0 0 1 eps attach 0 1 0 combined epsimsi attach. Different tasks and states of rrc protocol in lteeutran. Optimized lte data transmission procedures for iot. Incorporation of control plane rrc procedures in existing lte module.
If you continue browsing the site, you agree to the use of cookies on this website. Nov 15, 2012 1 introduction this document provides the details of rrc procedures as specified in 3gpp 36. Nov 14, 2012 rrc connection procedures is used to establish an rrc layer connection between the ue and utran. Ue authentication ue authentication is initiated by the serving mme through eps nas procedures. In case of dispute, the reference shall be the printing on etsi printers of the pdf. In lte security i1, part i of the lte security technical document, we have discussed lte authentication based on eps aka procedure and learned a ue and an mme get to share the k asme when authenticated.
Systems beyond imt2000 imtadvanced is set to introduce evolutionary path beyond 3g. To get service from the selected plmn, the ue performs two types of procedures. June 29, 2015 june 29, 2015 pradeep 16 comments paging is a generic term and its also used in lte, so i thought about writing a small but not detailed article on paging, its uses and how physical layer is involved in paging process. Rrc vs rab difference between rrc and rab in umts,wcdma,lte. Difference in rrc procedures lte and 3g slideshare. Paging is mostly a rrc procedure and it simply means waking up. It is a layer that exists between ue and enb and exists at the ip level layer 3network layer. In the lte rrc idle state, a ue specific drx discontinuous reception cycle may be configured by upper layers to enable ue power savings rrc connected state. To receive system information lte ue tunes to the control channels. View notes 19080432rrcproceduresinltecommentsv1 from cse 570 at stony brook university. For initiating any nas procedure, the ue is required to establish an rrc connection with the enodeb. Huawei lte for rail technical white paper page 9 signaling protection. Ue initiates this procedure by sending rrc connection request message.
The cross reference between gsm, umts, 3gpp and etsi identities can be. This protocol controls mac, rlc and pdcp layers in the lte air interface connecting an lte ue with an enodeb. Technical overview of 3gpp lte indian institute of. In this final part of lte for layman series, we conclude the learnings of first and second part to fully understand the underlying technology behind your lte cell phone. Some of the important paramenters in rrc connection request are establishment cause. Lte radio layer 2, rrc and radio access network architecture. The rrc protocol for eutran is responsible for the basic configuration of the radio protocol stack. In lte, release 12 specifications supported a lowprice ue category for iot category 0 featuring 1 a maximum data rate of up to 1 mbps, 2 support for fre. These channels are categorized as transport or control channels. Lte rrc connection setup lte long term evolution medium. Otherwise, the ue initiates the tracking area update if it changed its tracking area since the last update. Lte the umts long term evolution from theory to practice second edition stefania sesia stericsson, france.
Rrc connection establishment in lte background the first thing ue does after switching on is to synchronize to each frequency and check whether this frequency is from the right operator to which it wants to connect to. On the user plane, packets in the core network epc are encapsulated in a specific epc protocol and tunneled between the pgw and the enodeb. The procedure is also used to transfer the initial nas message from the. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on. Long term evolution lte is the latest buzzword on everyones lips, but are you as conversant with the lte architecture as you would like to be, or more importantly need to be. The purpose of this procedure, depicted in figure 8, is to request the resources from the network for its service needs. Mobile class targets 100 mbps with high mobility and nomadic local area class targets 1 gbpswith low. Rrc, rab, lte, volte, rrc connection and rab example. Upon plmn selection, lte ue uses cell selection for fast cell searching to camp on. Radio resource control rrc for lte the wireshark wiki. Transmission power same as existing lte less than 3 db less than 3 db under study with communication functions. Rrc procedure and drx operation in lte networks are.
Okay, we understand how rrc and rab works in umtswcdma and lte networks. However, there is a delay of several dozens of frames before it considers the preables as detected. Good news is that basically there would be only two messages you have to dig into. For example, mac scheduling and harq soft combining functions are not. An emm authentication request is sent to the user equipment with authentication parameters rand, autn and the nas key set identifier known as eksi or ksiasme. The mme operator may check the mobile equipment identity with eir. Difference in rrc procedures lte and 3g slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Ue must make the transition to rrc connected mode before transferring any application data, or completing any signalling procedures. Cell selection and reselection in lte ue teletopix.
Special articles on lte advanced release standardization. There are a good news and a bad news on rrc messages for carrier aggregation. It will help developers and testing engineer to understand the feature better andutilize their knowledge in various customer sites. In the lte rrc connected state, ue is known to both evolved packet coreepc and eutran enb lte base sttaion. Long term evolution lte is the latest buzzword on everyones lips, but are you as.
On the user plane, packets in the core network epc are encapsulated in a specific epc protocol and tunneled. Radio bearer establishment for establishing a new radio beare. Rrc connection setup message include default configuration for srb1 but can also include configuration information for pusch, pucch, pdsch physical channels, cqi reports, sounding reference. A ue in rrc connected state has an active rrc connection. If so, this paper will help get you up to speed in no time. These tests must be executed on every lte capable device model before they are commercially released.
The enodeb derives the mme from the rrc parameters carrying the old gummei and the indicated selected network. But one should note, that some radio management functions scheduling, physical resource assignment for physical channels are handled by layer 1 and layer 2 autonomously. The rrc states can further be characterized as follows. Lte protocol conformance testing lte layer 1 testing aspects verify physical layer procedures. Lte physical layer overview part iiiphysical channelsdownlink physical channels lte defines a number of downlink physical channels to carry information blocks received from the mac and higher layers. Protocol signaling procedures in lte radisys white paper 5 rrc connection and initial attach procedure after the random access procedure, if the ue is not already attached to the network it has to do so by initiating the attach procedure.
The radio resource control rrc protocol is used in umts and lte on the air interface. A study of the radio resource control connection re establishment procedure on the ue side in 3gpp jeonghwan lee, ki soon sung, sookyang kang and jaewook shin wireless transmission research department, electronics and telecommunications research institute daejeon, south of korea jeonghwan. The radio resource control layer establishes a connection between the ue and the enodeb. There are three rrc procedures included in this category. Figure 1 shows the protocol stacks related to nas and as security setup. Rrc connection setup rrc connection establishment involves signaling radio bearer 1 srb1 establishment. The control plane includes the radio resource control layer rrc which is responsible for configuring the lower layers. Protocol signaling procedures in lte lteadvanced radio layer 2 and rrc aspects.
However, with what we learned today, we can make a comparison with some gsm equivalent parameters. Before we move on to security setup procedures, we will look in the protocol stacks where nas and as security are actually applied to. Performance of cs fallback from lte to umts qualcomm. Radio layer 2 and rrc aspectsradio layer 2 and rrc aspects outline e. It also provides difference between rb,rab and srb and mentions umts, wcdma and lte related links. This is followed up with rrc connection establishment signaling on the ulsch and dlsch. Lte cell selection and lte cell reselection cell selection in lte. In this case, the ue should prioritize searching of lte frequencies. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. This procedure is initiated with a random access with a preamble. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously. Lte uu eutran mme s11 serving s5 gateway pdn gateway. Jun 04, 2017 establishing an rrc connection in lte typically involves the following steps lte rrc connection setup is published by eventhelix in lte long term evolution. Test script to send system information and other control messages.
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