Lte rlc tutorial pdf

In lte, there are two categories of logical channels depending on the service they provide. By selecting lte job as your career, you can surpass your limitations. Lets have a close look at all the layers available in eutran protocol stack which we have seen in previous chapter. This protocol sits between the mac and pdcp layers in the lte air interface connecting an lte ue with an enodeb. Acknowledgements are sent periodically to the remote peer. The term lte is typically used to represent both lte and sae. The new lte categories m1 and nb1 are added in lte 3gpp release. This paper provides an overview of the mac for 3gpp long term evolution lte also referred to as eutran, with a focus on the handset or user equipment ue. Lte uses different types of logical, transport and physical channel, which are well known by the kind of information they carry and by the way in which the information is being processed. Oct 02, 2018 hindi me logical to transport layer channel mapping and functions of rlc and mac layer pdf link. Physical resources, resource unit, scheduling unit radio protocol architecture. Acknowledged mode am of rlc to explain its complicated functionality. Scribd is the worlds largest social reading and publishing site. This is the next step in the continuous move to wider bandwidth and higher data rates.

Hope this tutorial on lte rlc pdu headers encoding will help you to understand the protocol better. Overview of lte radio interface and radio network architecture for high speed, high capacity and low latency ntt docomo technical journal vol. Lte provides a packet switched model at the sap, but retains a circuit switched model at the phy. What makes 5g better than lte, i discussed about the major enhancements that 5g exhibits over the current lte technology. This is a lte rlc implementation which aligns to 3gpp spec 36. Tutorial, survey and evaluation framework 1241 enb mme sgw mme sgw enb enb s1 s 1 s1 s 1 x2 x2 x2 eutran fig.

In other words, it will be a radiolevel simulation involving only lte phy, mac and the scheduler, with a saturation traf. Rlc model, and without supporting any ip networking. It is a multi mode wireless terminal for soho small. Volte tutorial this voice over lte beginners guide will help you to understand the fundamentals of ip based voice communication in the 4g lte network. I would suggest you to understand how user data follow through these layers. Lte eutran and its access side protocols radisys white paper 2 eutran the eutran consists of enodebs enb which provide eutra user plane pdcp rlc macphy and control plane rrc protocol terminations toward the user equipment ue. 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. Not only was the radio access network improved for 4g lte, but the network architecture was overhauled enabling lower latency and much better interconnectivity between elements of the radio access network, ran. The rlc layer assembles an upper layer sdus if receipt of an rlc pdu completes the assembly of the sdu. This article will describe the changes along with their purposes for each of the 5g nr layers. 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. Lte and sae are specified within 3gpp as part of the release. It aims to be a high quality and high performance rlc library and as well as can be easily integrated into your code. Ltea meets and exceeds all requirements for 4g as specified in imtadvanced.

Resource allocation in lte is made complex, especially when considering its target packetbased services and mobility pro. Rlc radio link control protocol is a data link layer protocol. Just as ethernet and the internet have different types of qos, for example, various levels of qos can be applied to lte traffic for different applications. Long term evolution protocol overview nxp semiconductors.

In this paper, we offer a tutorial on scheduling in lte and its successor lteadvanced. Tcp performance degradation of insequence delivery in lte link. The protocol stack functions consist of the medium access control. Enhancement of the utra optimisation of the utran architecture to ensure the continued competitiveness of the 3gpp technologies for the future lte was the first and only technology recognized by the next generation mobile network alliance to meet its broad requirements target deployment in 2010. Lte architecture supports hard qos, with endtoend quality of service and guaranteed bit rate gbr for radio bearers. The main services and functions of the rlc sublayer include. Lte uses several different types of logical, transport and physical channel, which are distinguished by the kind of information they carry and by the way in which the. The next important milestone is the standardization of lteadvanced lte rel. The first deployments were simply known as lte, but later deployments were designated 4g lte advanced and later still 4g lte pro. Mobile class targets 100 mbps with high mobility and nomadic local area class targets 1 gbpswith low. Audience this tutorial has been designed for audiences with a need to understand the. Lte measurements lte l2l3macrrc standards ts 36300. Lteadvanced tutorial in tutorial, artiza networks, lteadvanced, lte. Frequency division duplexing fdd and time division duplexing tdd both paired and unpaired.

Lte and lte advanced terminology rf wireless world terminology. The protocol stack functions consist of the medium access control mac, radio link control rlc, packet data convergence protocol pdcp, and radio resource control rrc. Myung 2 beyond 3g international mobile telecommunications imt2000 introduced global standard for 3g. Lte and lte advanced terminology rf wireless world. Sep 06, 2015 top 7 mistakes newbies make going solar avoid these for effective power harvesting from the sun duration. Lte communication channels in lte tutorial 23 may 2020. Jun 07, 2016 i have a confusion, couldnot understand why we have again rrc connection procedure and repeatition of some other subsequent messages in last ladder diagram of service request. A light version of the lte protocol for the access stratum user.

Below is a more ellaborated diagram of eutran protocol stack. The enbs are interconnected with each other by means of the x2 interface. As in the section for other layer, lets start by reading verbalizing the pictures from the specification. This page describes overview of 5g nr rlc layer including functions. Ltea can aggregate up to 5 carriers to make up to 100 mhz 4. Performance analysis and enhancements of packet forwarding in lte.

Systems beyond imt2000 imtadvanced is set to introduce evolutionary path beyond 3g. Mac, radio link control rlc, packet data convergence protocol pdcp, and radio. Nov 15, 2012 tmul is the transparent mode rlc entity used in uplink, umdlis the unacknowledgement mode rlc entity used in dl, am dl is theacknowledgement entity used in dl, alul is the acknowledgement entity used inuplink. Each logical channel is defined as per type of information it carries. Audience this tutorial has been designed for audiences with a need to understand the lte technology basics in very simple terms. Broadcast of system information o including nas common. Long term evolution lte and system architecture evolution sae. Most internet traffic, such as web browsing, ftp and email which is defined as am or acknowledged mode for lte rlc allow the packets that cant be sent due to capacity limitations to not be permanently blocked but delayed until network capacity is. Lte mac, rlc, and pdcp may 2012 bong youl brian cho.

Huawei huawei e3372 lte usb stick product description. A rlc entity receivesdelivers rlc sdus fromto upper layer and endsreceives rlc pdus tofrom its peer rlc entity via lower layers. Physical data channels between different levels of the physical layer. They are used by mac layer to provide services to rlc layer. Lte stands for long term evolution and it was started as a project in 2004 by telecommunication body known as the third generation partnership project 3gpp. This page of tutorials section covers 5g tutorial basics which mentions need for 5g wireless, 5g technology features, advantages of 5g and key 5g projects as we know we can not live without modern wireless technologies. Signalling in epclte course focuses on signalling between epslte nodes within gprs tunnelling protocol gtp based evolved packet core epc network. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Long term evolution lte is the next step forward in cellular 3g services. Fundamentals of lte ebook by arunabha ghosh rakuten kobo.

Since then the number of operators implementing the technology is strongly increasing around the globe. There are three different modes in which rlc pdus can operate. The radio link control rlc is a part of the protocol stack in both the ue and the. Lte eutran and its access side protocols radisys white paper 2 eutran the eutran consists of enodebs enb which provide eutra user plane pdcprlcmacphy and control plane rrc protocol terminations toward the user equipment ue. Abuali et al uplink scheduling in lte and lteadvanced. Huawei e3372 lte usb stick product description issue 02 20150119 commercial in confidence page 6 of 22 1 overview huawei e3372 lte usb stick hereinafter referred to as the e3372 as a high speed network acc ess terminal product. The physical layer itself maintains the continuous connection model, especially on the downlink, where there is continuous transmission. The 3gpp evolution for the 3g mobile system created the new base station system, called evolved umts terrestrial radio access network eutran and a new core network, called evolved packet core epc as a result of two standardisation projects. Apr 29, 2015 hope this tutorial on lte rlc pdu headers encoding will help you to understand the protocol better. Physical layer carries all information from the mac transport channels over the air interface. Physicalcommunication32010217244 219 table 1 lte,lteadvanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul. It covers 5g nr rlc modes tm mode,um mode, am mode,data structures tmd, umd, amd, rlc pdus tmd pdu, umd pdu, amd pdu, data transfers tm, um and am and rrc parameters which defines rlc layer. Nov 26, 2007 globecom 2007 tutorial mujtaba, winters 18 lte protocol architecture nas rrc pdcp rlc mac phy control plane user plane l2 l3 controlmeasurements transport channels how logical channels what radio bearers physical channels l1 rrc pdcp rlc mac phy pdcp rlc ue enodeb nas nas mme sgw s1mme s1u eutran epc nas pdcp rlc.

The ns3 lte module by the lena project nicola baldo nicola. Lte evolved from an earlier 3gpp system known as the universal mobile telecommunication system umts, which in turn evolved from the global system for mobile. An overview of 5g layers in the first topic, 5g nr. 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. Because the lte mac is fully scheduled, qos is a natural fit. The maclte dissector can call the rlclte dissector for srb1 and srb2 since it is known that these should be am. Rlc sub layer what do you read from the diagram above. The first diagram you will see in lte rlc specificationts 36. Lte evolved from an earlier 3gpp system known as the universal mobile telecommunication system umts, which in turn evolved from the global system for mobile communications gsm. Lte release 9 technology introduction white paper the lte technology as specified within 3gpp release 8 was first commercially deployed by end 2009. Sae system architecture evolution is the corresponding evolution of the gprs3g packet core network evolution. Lte has become the fastest developing mobile system technology. Rlc acts as an interface between pdcp and mac layers and provides services to both. Lte is based on an allip network, which uses packetswitched traffic definitions.

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