Radio link control rlc, and medium access control mac layers of the lteuu. If nas messages are encapsulted in rrc messages, lte rrc calls naseps dissector. It may sound too simple comparing to other radio access technology, but the detailed processes undergoing in these two status is not as simple as you might think. Lte provides a packet switched model at the sap, but retains a circuit switched model at the phy. We will mainly focus on the physical layer in this article and keep the treatment of higher layers to a. This book presents the technical characteristics of the two radio network interfaces of mobile 4g, lte and lte advanced, based on release 8, 9 and 10 of the 3gpp specifications.
More detailed description of each layer in the context of full protocol stack will be explained in full stack section. Rrc radio resource control is generally controls rlc configuration via rrcrlc sap. Now, in lte nr dc operation in which the lte enb is the mn, it would be necessary to enhance processing power and buffer size in the lte enb to support this mcg split bearer as the bandwidth on. With long term evolution lte comes a myriad of new and exciting attributes. The physical layer itself maintains the continuous connection model, especially on the downlink, where there is continuous transmission. From the editors of the highly successful wcdma for umts, this new book gives a complete and uptodate overview of long term evolution lte in a systematic and clear manner. Special articles on 5g standardization trends toward 2020. Lte is a trade mark of etsi currently being registered for the benefit of its members reception of the rrcconnectionsetup by the ue. Rev090004 lteadvanced radio layer 2 and rrc aspects magnus.
Lte layer 2 mac,rlc,pdcp interview questions techplayon. Rrc connection setup message dedicated info nas is used to transfer ue specific nas layer information between the network and the ue. 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. Eps consists of lte long term evolution, which is dedicated to the. In the lte rrc connected state, ue is known to both evolved packet coreepc and eutran enb lte base sttaion. Lte attach procedure call flow the lte attach procedure call flow is a subject that may seem hard to. Rlc acts as an interface between pdcp and mac layers and provides services to both. This protocol controls mac, rlc and pdcp layers in the lte air interface connecting an lte ue with an enodeb.
Physical rrc nas layer procedure of 4g lte terminal protocol conformance testing of 4g lte terminal. More specifically, the following three srb types are defined in eutra 1 srb0 is used for transport of rrc messages associated with the common control logical channel. It talks about nas, rrc, pdcp, rlc, mac, and physical layer. The pdcp layer also performs header compression rohc of ip data if supported. Mar, 2012 as used on lte, usually around dbm to avoid pingpong, hysteresis can be set to hopladjlthreshigh 6db on lte side, a2 rrc redirect trigger and cell reselection soc classification level 28 nokia siemens networks presentation author date 2glte reselection to higher priority lte layer rg20 bss253. Lte advanced by jeanette wannstrom, for 3gpp submission, may 2012 the driving force to further develop lte towards lte advanced, lte r10 is to provide higher bitrates in a cost efficient way, and at the same time completely fulfil the requirements set by itu for imt advanced, also referred to as 4g. This lte tutorial covers rrc layer state diagram used by lte ue. Rlc radio link control protocol is a data link layer protocol. Lte long term evolution standardization within the 3gpp 3rd generation partnership project has reached a mature state. Mar 24, 2010 layer 2 and 3 aspects magnus lindstrom.
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. Tutorial lte free download as powerpoint presentation. 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. Lte radio layer 2, rrc and radio access network architecture. In both cases, the information is processed by the following protocols before being passed to the physical layer for transmission. Lte is the latest generation of the 3gpp standards. Transmit receive data wcdma lte baseband signal generatorprocessor electricaltooptical converter opticaltoelectrical converter. Transport channels are located between the physical layer and mac layer. The main services and functions of the rrc sublayer include. In lte, the transmission or reception of new data tofrom a ue in rrc idle state requires the establishment of an rrc connection.
When is rrc connection release requested by upper layers initiated. Nov 06, 2015 this book presents the technical characteristics of the two radio network interfaces of mobile 4g, lte and lte advanced, based on release 8, 9 and 10 of the 3gpp specifications. The 5g layer 3 is rrc layer as shown in 5g protocol stack. However, lte rrc connection setup complete message does not carry this kind of information. Sr reestablishes the rrc connection between the ue and the enb, and user plane bearers. Pdcp, rlc, mac layers together make up lte layer 2. The ue is not required to support manual selection of csg ids while in. The 3rd generation partnership project 3gpps long term evolution lte standards.
Protocol stack for x2 user plane and x2 control plane. Provides a unique focus on radio protocols for lte and lte advanced lte a giving. As defined by 3gpp, lte layer 2 structure consists of pdcprlcmac layers. The 5g layer3 is rrc layer as shown in 5g protocol stack. Wisdom jobs let you make decisions that benefit your longlife career. Pdf the present wireless technology is 4th generation 4g or long term evolution.
It corresponds to the initial layer 3 message shown in figure 84 section 21. 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. A rlc entity receivesdelivers rlc sdus fromto upper layer and endsreceives rlc pdus tofrom its peer rlc entity via lower layers. The enodeb derives the mme from the rrc parameters carrying the old gummei and the indicated selected network. The rlc layer assembles an upper layer sdus if receipt of an rlc pdu completes the assembly of the sdu. Lte ue attachlte rrc connection setup log analysis lte video tutorials. Protocol specification release 11 the present document has been developed within the 3rd generation partnership project 3gpptm and may be further elaborated for the purposes of 3gpp. The mac layer passes the received rlc pdus to the rlc layer. This page covers lte rrc state diagram for ue compliant to lte standard. Mac multiplexes rlc links and manages scheduling and priority handling via logical channels.
Get your kindle here, or download a free kindle reading app. Wireless technologies protocol testers pcbased protocol. This video gives overview of lte air interface protocol stack. Broadcast of system information related to the nonaccess stratum nas. A signaling radio bearer is defined as a radio bearer that is only used for transmission of rrc and nas messages. Mac layer, in turn, offers services to the rlc layer by means of logical chan nels. The radio resource control rrc layer manages control plane exchanges between the enodeb and connected ues. Long term evolution protocol overview nxp semiconductors. At high level view, lte rrc has only two status rrc connected and rrc idle. 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. The rlc layer performs framing of rlc sdus to put them into the size indicated by the selection from radio protocols for lte and lteadvanced book. Physicalcommunication32010217244 219 table 1 lte,lteadvanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul. It also transfers messages of the nonaccess stratum nas, which is located above the rrc layer.
Tagged lte lte interview questions lte layer 2 lte technical questions mac pdcp rlc post navigation. What is difference between acceptable, suitable and reserved cell. A nw or ue vendor wishing to implementsupport the sstd measurement reporting must use the version. Packet data convergence protocol pdcp in the lte radio protocol stack, the pdcp layer is located above the rlc layer and below the ip layer in the user plane or the rrc layer in the control plane. Radio resource control rrc protocol writes the signaling messages that are exchanged between bs and mobile. Rrc connection mobility including intrafrequency and interfrequency handover, associated security handling, i. If nas messages are encapsulted in rrc messages, lterrc calls naseps dissector. Nov 15, 2012 this document will also help developerto start thinking design of rrc in lte. Protocol signaling procedures in lte radisys white paper. Following are some of the points about ue in these modes. Physicalcommunication32010217244 219 table 1 lte, lte advanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul. Chapter 5 radio link control rlc 3gpp provides the rlc specification in 1.
Radio resource control rrc for lte the wireshark wiki. Physical layer specifications are described in the ts 38. A simulation implementation of the lteuu interface datalink layer. It is a layer that exists between ue and enb and exists at the ip level. Jan 07, 20 rlc is a layer 2 protocol in lte ue and nodeb. Pdf development of lte ue protocol stack at non access. Apr 23, 2016 lte layer 3 rrc layer interview questions. Provides a unique focus on radio protocols for lte and lte advanced lte a giving readers a valuable understanding of lte radio protocols, this book covers lte longterm evolution layer 23 radio protocols as well as new features including lte advanced.
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. In stead, lte designed a new message dedicated for investigating ue capability. After rrc connection establishment, the ue transits to rrc connected state and the. Sep 14, 2015 4g lte kpi key performance indicators training course what are lte kpis by telcoma global duration. It generates the system information blocks sibs broadcast by the enodeb and handles the establishment, maintenance and release of rrc connections with the ues. The radio resource control rrc protocol is used in umts and lte on the air interface. The radio resource control rrc layer manages control plane exchanges between the ue and the enodeb. 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.
Pcbased protocol tester for umts lte developments for the new mobile radio standard umts long term evolution lte are running at full speed. Network establishes the srbs and drbs based on the establishment cause. This article is based on material taken from the free online dictionary of. Did you set your sights on telecommunication filed. It is a layer that exists between ue and enb and exists at the ip level layer 3network layer. Sep 05, 2012 provides a unique focus on radio protocols for lte and lte advanced lte a giving readers a valuable understanding of lte radio protocols, this book covers lte longterm evolution layer 23 radio protocols as well as new features including lte advanced.
Points covered include a detailed description of various components of the radio interface. Radio protocols for lte and lte advanced pdf download. Mde bde rec cpri opticaltoelectrical converter electricaltooptical converter wcdma lte rrc filter dpd da quadrature modulation dup. Layer 1 monitors downlink quality and indicates problems to rrc rrc filters l1 indications and starts a timer if no recovery within 1st phase, triggers 2nd phase layer 2 monitors random access attempts and indicates problems to rrc rrc triggers 2nd phase 2nd phase radio link failure. 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. Huawei huawei e3372 lte usb stick product description. The lte link layer protocols are optimized for low delay and low overhead and are simpler than their. Lte mac layer interview question and answer 15 6g5g4g. The initial attach procedure is unchanged compared with lte. The present document has not been subject to any approval process by the 3gpporganizational partners and shall not be implemented.
Narrowband iot data transmission procedures for massive. May 22, 2016 we will go through ue logs and understand rrc connection setup procedure in detail. Transmission protocol sctp as the transport protocol. 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 is a trade mark of etsi currently being registered. Do you want to work as professional at a high standard organization. The message may optionally contain registered mme the rrc connection setup complete may also carry octets for a nas message. Radio resource control rrc radio protocols for lte and. Springer nature is making sarscov2 and covid19 research free. Lte layer 3 rrc layer interview questions techplayon. Support for this feature requires enhancement to the lte release 89 phy, mac, and rrc layers while ensuring that lte release 10 maintains backward compatibility to lte release 89. Development of lte ue user equipment protocol stack at. Physical layer overview and performance ieee communication theory workshop 2018 amitabha ghosh. The new product, the lte virtual tester, is a powerful protocol test environment for generating lte signaling.
Agenda lte protocol stack physical rrc nas layer procedure of 4g lte terminal protocol conformance testing of 4g lte terminal. Lte ue attachlte rrc connection setup log analysis youtube. Signaling provided the rrc layer has the following characteristics such as higher extensibility, secured transmission, reliable transmission and. 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. 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. Radio resource control rrc is the highest layer in the control plane of the access stratum as.
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