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. Combining a study of typical user behavior in 3gpp networks with. If you continue browsing the site, you agree to the use of cookies on this website. Performance comparison of dual connectivity and hard. Lte radio layer 2, rrc and radio access network architecture. It also explains steps and procedures that can be used to minimize the failures. This procedure is initiated with a random access with a preamble. In the lte rrc connected state, ue is known to both evolved packet coreepc and eutran enb lte base sttaion. It is a layer that exists between ue and enb and exists at the ip level. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on a. Rrc connection reconfiguration for measuring the second cell.
Like every technology, lte has many kpis that need to be maintained and optimized. Stopandwait algorithm and supports incremental redundancy and chase combining. Which rlc mode is used for srb0, srb1, srb2, and drb. Sn rrc message srb rlc sap logical channel direction desc 1 paging na tm pcch e. The radio resource control layer establishes a connection between the ue and the enodeb. The radio resource control rrc protocol is used in umts and lte on the air interface. In comparison, ues are the same, different radios, on one end lte, and into the future a 5g radio.
Ue must make the transition to rrc connected mode before transferring any application data, or completing any signalling procedures. 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 user and control planes after the. Sep 14, 2015 4g lte kpi key performance indicators training course what are lte kpis by telcoma global duration. Rethinking rrc state machine optimization in light of recent advancements theodore stoner university of cincinnati theodore. The value of this wait time is an integer number in the range of 116. Rrc connection setup timer expire s1mme timer expire according to the 3gpp ts 36. Apart from basic rrc messages, what additional information is transported on each messages and what happens with such information. Rrc layer is the most significant part of the control plane in protocol stack. Positioning architecture in lte networks positioning information exchange between the ue and the lte network is enabled by the lte positioning protocol. Radio resource control rrc request pdf researchgate. So, let us get started without wasting any further time.
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. I like to use wireshark to decode the lte signaling between enodeb and ue for which i develope the software myself i. Reception of the rrcconnectionreestablishment by the ue. This document will also help developerto start thinking design of rrc in lte. This proposal is to enhance and develop the rrc entity is ns3 lte for control plane handling in ue and enodeb. The control plane includes the radio resource control layer rrc which is responsible for configuring the lower layers. Index terms 3gpp, lte, radio resource control rrc, machine type communication mtc, discontinuous. Rrc success rate is one of the most important kpis for lte accessibility. It also provides difference between rb,rab and srb and mentions umts, wcdma and lte related links. Ue controlled mobility based on network configuration. Lte is the latest generation of the 3gpp standards. The cross reference between gsm, umts, 3gpp and etsi identities can be.
A simplified and efficient lte rrc conformance testing. Ue must make the transition to rrc connected mode before transferring any application. To ensure reliability, the network uses a double radio layer and redundant control nodes. Rrc vs rab difference between rrc and rab in umts,lte. Lpp is similar to protocols such as rrc, rrlp, and is801 already deployed in 2g and 3g networks lpp is used both in control plane and user plane enabled by supl 2. Lte system bandwidth 10 mhz lte transmission bandwidth 9 mhz 50 prbs operation within lte band lte system bandwidth 10 mhz lte transmission bandwidth 9 mhz 50 prbs another 1. If nas messages are encapsulted in rrc messages, lterrc calls naseps dissector. This page on rrc vs rab describes difference between rrc and rab terms used in umts and lte. Then the new merged buffer is given to the reassembly algorithm.
Im new to wireshark and i hope that someone can tell me what i shall do to be able to decode lte control signaling headers. There are a good news and a bad news on rrc messages for carrier aggregation. A study of the radio resource control connection re. A ue specific drx may be configured by upper layers. 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. Difference in rrc procedures lte and 3g slideshare. Rrc, rab, lte, volte, rrc connection and rab example. Rrc state transitions, the focus of this paper, are fundamental in allowing the network to balance radio resources between users. Lte rrc connection setup lte long term evolution medium. However, with what we learned today, we can make a comparison with some gsm equivalent parameters. 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.
Special articles on lte advanced release standardization. Rrc messages are transported via the pdcpprotocol the major functions of the rrc protocol include connection establishment and release functions. This protocol controls mac, rlc and pdcp layers in the lte air interface connecting an lte ue with an enodeb. The rrc connection release message is used to command the release of an rrc connection. Decoding lte rrc, pdcp, etc 0 im new to wireshark and i hope that someone can tell me what i shall do to be able to decode lte control signaling headers. This proposal is to enhance and develop the rrc entity is ns3 lte for. May 05, 2017 user who wants to test lte rrc needs to extract asn. Request pdf radio resource control rrc radio resource control. Huawei lte for rail technical white paper page 5 deployed a tdd 1. It can be used as a start for commercial applications and ideal for test purposes. Multiple prbs can be allocated to an nbiotcapable ue to increase capacity. Concatenation instead is merging pdcp sdus to a larger rlc pdu. Mde bde rec cpri opticaltoelectrical converter electricaltooptical converter wcdma lte rrc filter dpd da quadrature modulation dup. Current rrc entity in the present lte module of ns3 has the handling of user plane.
Difference in rrc procedures lte and 3g slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If so, this paper will help get you up to speed in no time. Myung 6 requirements of lte peak data rate 100 mbps dl 50 mbps ul within 20 mhz bandwidth. Establishing an rrc connection in lte typically involves the following steps lte rrc connection setup is published by eventhelix in lte long term evolution. These tests must be executed on every lte capable device model before they are commercially released. Transmission power same as existing lte less than 3 db less than 3 db under study with communication functions. Broadcast of system information related to the nonaccess stratum nas. Mar 16, 2016 sn rrc message srb rlc sap logical channel direction desc 1 paging na tm pcch e.
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. As a global standard, lte might connect more people than ever before. However rrc connection reject message provides the wait time parameter. Rrc success rate this is the first part in lte kpi optimization and more related articles will be published soon. The rrc connection release procedure with redirection information can also be used for csfallback to geran or utran.
As the control entity of the whole lte, rrc accomplishes the functions such. 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. The information pertaining to these essential iprs, if any, is publicly available for etsi members and nonmembers, and can be found. User who wants to test lterrc needs to extract asn. Rrc radio resource control protocol belongs to the lte protocol stack and handles the control.
Aug 19, 2018 in comparison, ues are the same, different radios, on one end lte, and into the future a 5g radio. The connection establishment progresses through the following phases. Would you like to find out more about lte, but have little time to devote to it. Theory and practice of rrc state transitions in umts networks. On the user plane, packets in the core network epc are encapsulated in a specific epc protocol and tunneled. Lte the umts long term evolution from theory to practice second edition stefania sesia stericsson, france.
The layer3 rrc protocol also terminates in both the wireless device and the base station. 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. The main services and functions of the rrc sublayer include. Lte uu eutran mme s11 serving s5 gateway pdn gateway. Radio resource control rrc for lte the wireshark wiki. Rrc measurements cheat sheet fdd is a one page help guide. In this document we have recorded all the rrc measurements and the meaning of those events. Transmit receive data wcdmalte baseband signal generatorprocessor electricaltooptical converter opticaltoelectrical converter. The radio protocol architecture for lte can be separated into control plane architecture and user plane architecture as shown below at user plane side, the application creates data packets that are processed by protocols such as tcp, udp and ip, while in the control plane, the radio resource control rrc protocol writes the signalling messages that are exchanged between the base station and. This article explains the details about the rrc setup procedure and the common failures seen at the rrc phase. Rrc connection release in lte redirectedcarrierinfo loadbalancingtaurequired, csfallbackhighpriority. 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. Nov 15, 2012 this document will also help developerto start thinking design of rrc in lte. Radio resource control rrc in specification, rrc, lte.
The rrc states can further be characterized as follows. New potential of openairinterface as the private lte. The cross reference between gsm, umts, 3gpp and etsi identities can be found under. Rrc vs rab difference between rrc and rab in umts,wcdma,lte. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously. Lte layer 2 mac,rlc,pdcp interview questions techplayon. 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.
Transmit receive data wcdma lte baseband signal generatorprocessor electricaltooptical converter opticaltoelectrical converter. 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. Okay, we understand how rrc and rab works in umtswcdma and lte networks. Rrc connection establishment in lte all about wired and. Rrc signaling includes the exchange of nonaccess stratum nas messages between the ue. Good news is that basically there would be only two messages you have to dig into. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. Ue capability information and rrc connection reconfiguration. Protocol specification eventstudio system designer sequence diagram based systems engineering tool. Rrc connection release in lte the rrc connection release message is used to command the release of an rrc connection.
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