Lte is a trade mark of etsi currently being registered. System information the broadcast of system information to all ues rrc connection control all procedures related to the establishment, modification and release of an rrc connection e. Different tasks and states of rrc protocol in lteeutran. Myung 6 requirements of lte peak data rate 100 mbps dl 50 mbps ul within 20 mhz bandwidth. Information on the current status of this and other etsi documents is. 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. The rlc layer assembles an upper layer sdus if receipt of an rlc pdu completes the assembly of the sdu. Aug 09, 2012 how to layer 2 functions and data flow in lte.
Physical layer phy logical channels transport channels control measurements layer 3 layer 2 layer 1 reference. Pdcp, rlc, mac layers together make up lte layer 2. As others have mentioned its a big topic to go after lte stack protocol development. Sdap is a completely new layer added to nr on top of pdcp. Pcbased protocol tester for umts lte developments for the new mobile radio standard umts long term evolution lte are running at full speed. As defined by 3gpp, lte layer 2 structure consists of pdcprlcmac layers. A study of the radio resource control connection re. Functions related to bearer management this includes the establishment, maintenance and release of the bearers and is handled by the session management layer in the nas protocol.
Protocol stack for x2 user plane and x2 control plane. Myung 2 beyond 3g international mobile telecommunications imt2000 introduced global standard for 3g. The control plane includes the radio resource control layer rrc which is responsible for configuring the. Functions related to bearer management this includes the establishment, maintenance and release of the bearers and is handled by the session management layer in. The rlc layer is present on top of the medium access control mac layer and beneath other higher layers such as rrc radio resource control and pdcp packet data convergence protocol in the lte protocol stack. Lte protocol stack layers in lte tutorial 12 april 2020. This document will also help developerto start thinking design of rrc in lte. Pdf a case study on protocol stack integration for 3gpp lte. Mar 24, 2010 layer 2 and 3 aspects magnus lindstrom.
Control mac layer is identical, with one minor distinction, the rlc radio link control layer is identical, and the radio resource control rrc layer is essentially identical, with some distinction regarding when a couple of messages can be sent. Dec, 2010 telecommunication design lte rlc sub layer systems engineering realtime and embedded systems rlc sdus are exchanged upper layer i. Lte uu eutran mme s11 serving s5 gateway pdn gateway. Vulnerabilities of lte to rf interference and spoofing. As defined by 3gpp, lte layer 2 structure consists of pdcp rlc mac layers. In case of dispute, the reference shall be the printing on etsi printers of the pdf version kept on. Lte phy overview electrical and computer engineering. The main services and functions of the rrc protocol include broadcast of system information, paging, establishmentrelease of an. Radio resource control rrc for lte the wireshark wiki. The new product, the lte virtual tester, is a powerful protocol test environment for generating lte signaling. Radio link control an overview sciencedirect topics.
Rrc connection establishment in lte all about wired and. There are a good news and a bad news on rrc messages for carrier aggregation. Lte uses several different types of logical, transport and physical. The figure depicts data flow through various protocol layers of 5g nr stack. Rlc acts as an interface between pdcp and mac layers and provides services to both. The radio resource control rrc layer manages control plane exchanges between the ue and the enodeb. The layer above the rlc layer is typically the pdcp layer, but in some cases it is the rrc layer. Radio resource control rrc radio protocols for lte and. The connection control of rrc sublayer design and simulation. This paper introduces the function of rrc layer and mainly focuses on the rrc layer connection reconfiguration. Signaling provided the rrc layer has the following characteristics such as higher extensibility, secured transmission, reliable transmission and.
Lte is the latest generation of the 3gpp standards. It is a layer that exists between ue and enb and exists at the ip level layer 3network layer. Radio resource control rrc,radio link controlrlc or mac layer and then study more about it. This white paper summarizes these necessary improvements specified in 3gpp release 10, which are also known as lteadvanced. 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. 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. A nw or ue vendor wishing to implementsupport the sstd measurement reporting must use the version. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously. Rrc radio resource control is generally controls rlc configuration via rrcrlc sap. Lte is the latest generation of the 3gpp standards iponly network support data rates up to 100 mbps deployment starting in 2009 this presentation will describe all these functions, which consist of the mac, radio link control rlc, packet data convergence protocol pdcp, and radio resource control rrc. Rrc protocol layer exists in both the ue and enodeb enb. The main services and functions of the rrc sublayer include. On this page we will see rrc state diagram along with functions of all the states. So the research and design of rrc layer have the magnitude meaning to.
Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. Good news is that basically there would be only two messages you have to dig into. Transport channels are located between the physical layer and mac layer. Lte phy overview gwanmo ku adaptive signal processing and information theory research group nov. On the network layer layer three, passive or active attackers can either localize a user or deny the service and thus downgrade the phone to the insecure gsm network 24. Connection establishment procedure at ue side ue user equipment can make the transition from idle mode to the connected mode using rrc radio resource control connection establishment. Rlc radio link control protocol is a data link layer protocol. Signaling provided the rrc layer has the following characteristics such as higher extensibility, secured transmission, reliable transmission and longer processing delay. The rrc states can further be characterized as follows. Lte radio layer 2, rrc and radio access network architecture.
Ue capability information and rrc connection reconfiguration. Lte protocol stack layers lets have a close look at all the layers available in eutran protocol stack which we have seen in previous chapter. How to verify your lte protocol and rf interactions. Multiple pdcchs can be transmitted in the same subframe using control channel elements cce each of which is a nine set of four resource elements known. In the lte rrc connected state, ue is known to both evolved packet coreepc and eutran enb lte base sttaion. This protocol controls mac, rlc and pdcp layers in the lte air interface connecting an lte ue with an enodeb. Lte protocol stack layers in lte lte protocol stack layers in lte courses with reference manuals and examples pdf. Note that in 3gpp standards, the data link layer is divided into four sub layers. There are two rrc states in gsm mobile subscriber station viz.
Radio resource control rrc protocol writes the signaling messages that are exchanged. The diagrams below show the structure for the downlink and uplink of layer 2. A rlc entity receivesdelivers rlc sdus fromto upper layer and endsreceives rlc pdus tofrom its peer rlc entity via lower layers. Layer 3 radio resource control protocol the rrc is large and complex, covering a number of functional areas. Introduction in the 3gpp, rrc protocol layer exists in ue and enb and handles the control plane signaling of layer 3. Jun 01, 2008 in the lte protocol architecture for user plane top and control plane bottom, layer 1 and layer 2 airinterface protocols terminate in the wireless device and in the enb. Radio resource control rrc the main services and functions of the rrc sublayer include broadcast of system information related to the nonaccess stratum nas, broadcast of system information related to the access stratum as, paging, establishment, maintenance and release of an rrc connection between the ue. Prior to joining kcl, he was with the cellular industry and worked in the areas of network. If nas messages are encapsulted in rrc messages, lterrc calls naseps dissector. It is not possible in this blog to explain all the. Lte technology is a based on a 3gpp standard that provides for a downlink speed of up to 150 megabits per second mbps and an uplink speed of up to 50 mbps. Aug 07, 2012 the rrc protocol for eutran is responsible for the basic configuration of the radio protocol stack.
The mac layer passes the received rlc pdus to the rlc layer. Changes in the specification are limited to corrections and bug fixes. Lteadvanced technology introduction white paper although the commercialization of lte technology began in end 2009, the technology is being enhanced in order to meet itu advanced requirements. It corresponds to the initial layer 3 message shown in figure 84 section 21. I will suggest to go and compare the lte protocol stack with osi model and then pick and choose one layer e. Legacy lte functionality validated on merge, still testing lte m. See channel coding page to see which channel uses which coding method.
The layer 2 protocols include the mac protocol, the rlc protocol, and the pdcp. The research and implementation of rrc layer connection. Long term evolution lte is the next step forward in cellular 3g services. Actions related to transmission of rrcconnectionrequest message. 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. The connection control of rrc sub layer design and simulation in lte system. Would you like to find out more about lte, but have little time to devote to it. To ensure reliability, the network uses a double radio layer and redundant control nodes. Rrc connection mobility including intrafrequency and interfrequency handover, associated security handling, i. But still there would be some possibility of rlc layer issues especially related to fragmentation and timing issues due to following reasons.
As shown pdcp layer provide services to the upper layers rrc or sdap and it expects some services from the rlc layer, mac layer and phy layer. Radio resource control rrc is the highest layer in the control plane of the. Most of the functionality, however, has to be in the physical layer, and the rrc layer has only a management role. Rrc layer or pdcp sub layer with upper layers sap between upper layers transmitting receiving transmitting receivingtm rlc entity tm rlc entity um rlc entity um rlc entity am rlc. Pdf this paper presents a case study of the integration of the long term. Protection in the lte control plan mme nas k nasint k nasenc enodeb rrc k rrcint k rrcenc with nas as well as rrc ue nas k nasint k nasenc rrc k rrcint k rrcenc lte supports two levels on security on the control plane the nas traffic between the mme and the ue is protected with nas level keys the rrc connection. There are some differences between the lte fdd and lte tdd modes that we identified. In this theory, lte would have less problems since lte can have very large data pipe that can carry a whole cplaneuplane packet with single transmission. Critical analysis of connection establishment procedure in. Rrc, radio resource control, connection reestablishment, 3gpp i. The compliance and interoperability testing and verification follow upon completion of stage 3. In lte, tail bit convolution coding and turbo coding are the major technology for channel coding, but in nr polar coding and ldpc are adopted as major technology of channel coding. Lte evolved universal terrestrial radio access eutra radio resource control rrc. The message may optionally contain registered mme the rrc connection setup complete may also carry octets for a nas message.
Pdf on mar 12, 2018, hassan alkhateeb and others published lte mac, rlc, and pdcp find, read and cite all the research you need on researchgate. The ue is not required to support manual selection of csg ids while in. Index terms 3gpp, lte, radio resource control rrc, machine type. Protocol overview this whitepaper presents an overview of the protocol stack for lte with the intent to describe where important functions reside along with the implications of such architectural design. Physicalcommunication32010217244 219 table 1 lte, lte advanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul. The radio resource control rrc protocol is used in umts and lte on the air interface.
Physical rrc nas layer procedure of 4g lte terminal protocol conformance testing of 4g lte terminal. Apr 23, 2016 lte layer 3 rrc layer interview questions. Ue controlled mobility based on network configuration. Lte layer 3 rrc layer interview questions techplayon. How to layer 2 functions and data flow in lte teletopix. Lte is designed to combine performance goals such as high transmission. When is rrc connection release requested by upper layers initiated. Protocol specification eventstudio system designer sequence diagram based systems engineering tool. The layer 3 rrc protocol also terminates in both the wireless device and the base station. Pdf a unified protocol stack solution for lte and wlan. The figure1 depicts 5g nr protocol stack showing position of pdcp layer. Mac multiplexes rlc links and manages scheduling and priority handling via logical channels.
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. Then the new merged buffer is given to the reassembly algorithm. 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. A unified protocol stack solution for lte and wlan in future mobile converged networks. The 5g layer 3 is rrc layer as shown in 5g protocol stack. Systems beyond imt2000 imtadvanced is set to introduce evolutionary path beyond 3g. Radio resource control rrc request pdf researchgate. Sep 14, 2015 lte radio resource control rrc budi prasetyo. The specifications do not accurately dictate how the initial cell selection procedure should be implemented. Users of the present document should be aware that the document may be subject to revision or change of status. Huawei lte for rail technical white paper page 5 deployed a tdd 1.
Show full abstract turbo coded mqam block error rate, and chase combining are taken into account. Fixed wireless and wired standards are already approaching or achieving 100 mbps or faster, and lte is a way. Packet duplication in dual connectivity enabled 5g wireless. These channels are categorized as transport or control channels. Mobile class targets 100 mbps with high mobility and nomadic local area class targets 1 gbpswith low. Our results suggest that the lte protocol stack can operate synchronously. These tests must be executed on every lte capable device model before they are commercially released.
Agenda lte protocol stack physical rrc nas layer procedure of 4g lte terminal protocol conformance testing of 4g lte terminal. In the td lte system, rrc radio resource control layer plays a very important role as the control center in the whole higher layer protocol. Lte is a trade mark of etsi currently being registered for the benefit of. If so, this paper will help get you up to speed in no time. Jan 07, 20 rlc is a layer 2 protocol in lte ue and nodeb. 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. It uses system information broadcast by the network to configure the lower layers of the ue and handles the establishment, maintenance and release of the rrc connection with the enodeb. Radio resource control rrc the main services and functions of the rrc sublayer includes broadcast of system information related to the following. It is noteworthy that the pdcp layer in lte already sup ports duplicate. Nov 21, 20 this entry was posted in 4g, lte, lteadvanced, release 10, release 11 and tagged 3gpp, lte, pcell, radio link failure, release 11, rlf, rlm, rrc, t300, t301, t304, t310, t311 on november 21, 20 by allabout4g. The rrc states can further be characterised as follows. Rrc connection setup message dedicated info nas is used to transfer ue specific nas layer information between the network and the ue. Chongqing university of posts and teleconmunications. When we switch the mobile it will be in idle mode until we receive.
Rrc messages transmitted on the logical channels pcch, bcch, and ccch do not require security protection, and thus go directly to the rlc layer, bypassing the pdcp layer. Performs neighbouring cell measurements and cell reselection. I like to use wireshark to decode the lte signaling between enodeb and ue for which i develope the software myself i. Rrc connection request srb 0 ccch ulsch pusch rrc connection setup complete srb 1 dcch ulsch pusch figure 107 signalling for rrc connection establishment the rrc connection request message is sent as part of the random access procedure.
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