Consists of an evolved packet core epc and evolvedutran eutran. Lte advanced 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. 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. Nas layer can bypass access network eutran to interact with core network epc, evolved packet core directly. User plane adopts udp user datagram protocol to transport user data.
It is not possible in this blog to explain all the. Lte or wcdma is also possible when the serving cell will have any issue. Rrc layer rrc layer a architecture rrc layer handles the. Radio resource control rrc for lte the wireshark wiki. Lte rrc connection setup lte long term evolution medium. 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.
Rev090004 lteadvanced radio layer 2 and rrc aspects magnus. This protocol controls mac, rlc and pdcp layers in the lte air interface connecting an lte ue with an enodeb. Network establishes the srbs and drbs based on the establishment cause. The radio resource control rrc protocol is used in umts and lte on the air interface.
The relay nodes are low power base stations that will provide enhanced coverage and capacity at cell edges, and hotspot areas and it can also be used to connect to remote. 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. Following is an example for rrc connection reconfiguration for lte advanced with focus on carrier aggregation. There are a good news and a bad news on rrc messages for carrier aggregation. It corresponds to the initial layer 3 message shown in figure 84 section 21. On this page we will see rrc state diagram along with functions of all the states. Apr 23, 2016 lte layer 3 rrc layer interview questions. Physical layer layer 1 physical layer carries all information from the mac transport channels over the air interface. For protocol stack involving other layers such as physical layer,lapd,lapdm,rrm,mm,cm,sccp,bssmap and btsm refer gsm protocol stack. The rrc configurator helps ensure consistent configuration of the lte protocol stack and also evaluates the protocol messages exchanged between the mlapi test scenario and the ue. The connection control of rrc sublayer design and simulation in.
In lte crnti is indirectly allocated by mac layer where as in 3grnc system crnti is allocated by the rrc layer and indicates to the mac layer. Lte uu eutran mme s11 serving s5 gateway pdn gateway. I just enabled all ie on asn to give you full details of parameters, but it reality the implementation would start with very limited set of parameters enabled and leaving large portions of parameter to some 3gpp default or hardcoded. Lte layer 3 rrc layer interview questions techplayon. Radio imt advanced based on lte release 10 and beyond. The message may optionally contain registered mme the rrc connection setup complete may also carry octets for a nas message. The major functions of the rrc protocol include connection establishment. Will the lte client reestablish a new pdp context activation request to the network to keep lte connected. In lteadvanced, the possibility for efficient heterogeneous network planning i. This protocol is layer 2 of the lte air interface connecting an lte ue with an enodeb. 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. Nov 15, 2012 this document will also help developerto start thinking design of rrc in lte. Huawei lte for rail technical white paper page 5 deployed a tdd 1. 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.
Rrc connection establishment in lte all about wired and. In the lte protocol architecture for user plane top and control plane bottom, layer1 and layer2 airinterface protocols terminate in the wireless device and in the enb. At this step, the setup has been established only at rrc layer and mac layer for the second carrier is not yet activated. Linked to rel8 study on scope of future hspa evolution for 1. When is rrc connection release requested by upper layers initiated. It is divided into two sections to differentiate between the two technologies characteristics.
Protocol specification eventstudio system designer sequence diagram based systems engineering tool. 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. In the case of umts, the initial nas message is transferred after the rrc. This white paper summarizes these necessary improvements specified in 3gpp release 10, which are also known as lte advanced. It is a layer that exists between ue and enb and exists at the ip level. Development of lte ue user equipment protocol stack at. A udp framing format for maclte has been defined described in packetmaclte. There are two rrc states in gsm mobile subscriber station viz. 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. Long term evolution protocol overview nxp semiconductors.
Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. Figure 4 depicts the access side protocol suite consisting of rrc, pdcp, rlc, mac, and phy layers. This paper also illustrates design of function, signaling process and uses the third party terminal and tracking software to calculate the. 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. Rrc establishment in lte lte in bullets book rrc connection establishment for lte is relatively simple compared to rrc. Lte radio layer 2, rrc and radio access network architecture. The downlink direction from network to terminal is covered first. From theory to practice provides the reader with a comprehensive systemlevel understanding of lte, built on explanations of the theories which underlie it. In the tdlte system, rrc radio resource control layer plays a very important role as the control center in the whole higher layer protocol. The layer 3 rrc protocol also terminates in both the wireless device and the base station. This video explains ue registration or attach procedure.
Takes care of the link adaptation amc, power control, cell search for initial synchronization and handover purposes and other measurements inside the lte system and between systems for the rrc layer. Lte ue attachlte rrc connection setup log analysis. The layer2 protocols include the mac protocol, the rlc protocol, and the pdcp. 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. Long term evolution lte is the 4th generation cellular mobile system that is being developed and.
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 lteadvanced. 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. Pdf development of lte ue protocol stack at non access. Lte is the latest generation of the 3gpp standards. During random access procedure mac layer provides tcrnti to the ue and ue uses this tcrnti as a. 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. In the lte rrc connected state, ue is known to both evolved packet coreepc and eutran enb lte base sttaion. 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 access network protocol stack of lte is separated into control and user plane in logic 1, the radio resource control rrc layer is the most significant part of the. This white paper summarizes these necessary improvements specified in 3gpp release 10, which are also known as lteadvanced.
How lte security implementation through encryption posted on 27 november, 20 implement security through encryption both control plane rrc data and user plane data and integrity protection for control plane rrc data only, it is the responsibility pdcp layer. We will go through ue logs and understand rrc connection setup procedure in detail. In order to further reduce the processing requirements of the user plane protocol stack in lte, the headers created by each of the pdcp, rlc and mac layers are. Mar 24, 2010 layer 2 and 3 aspects magnus lindstrom. Jeanette wannstrom, for 3gpp, submission, june 20 in lteadvanced focus is on higher capacity. Jul 03, 2019 descriptor and table of contents 1 of 24 for 3gpp ts mobile radio interface layer 3 specification core network protocols. It is a layer that exists between ue and enb and exists at the ip level layer 3network layer. An uplink packet is then described, highlighting any differences. Good news is that basically there would be only two messages you have to dig into. Users of the present document should be aware that the document may be subject to revision or change of status. The layer3 rrc protocol also terminates in both the wireless device and the base station. 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. A nw or ue vendor wishing to implementsupport the second broadcast channel must use the version 12.
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. The layer 2 protocols include the mac protocol, the rlc protocol, and the pdcp. This paper introduces the function of rrc layer and mainly focuses on the rrc layer connection reconfiguration. Rrc signaling messages used to establish the connection, enabling the security, the paging, the establishment and the release of dedicated and default support and the handover. The research and implementation of rrc layer connection. There are some differences between the lte fdd and lte tdd modes that we identified. 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. Information on the current status of this and other etsi documents is available at. Ue capability information and rrc connection reconfiguration. Nas layer and rrc layer are simulated by nas emulation. 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. Establishing an rrc connection in lte typically involves the following steps lte rrc connection setup is published by eventhelix in lte long term evolution. Pdf on mar 12, 2018, hassan alkhateeb and others published lte mac, rlc, and. How lte security implementation through encryption.
If nas messages are encapsulted in rrc messages, lterrc calls naseps dissector. Tagged lte lte interview questions lte layer 3 rrc rrc interview question post navigation. Pdf the present wireless technology is 4th generation 4g or long term evolution lte and lte. 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. Descriptor and table of contents 1 of 24 for 3gpp ts mobile radio interface layer 3 specification core network protocols. While the mlapi test scenario includes only the transmission of and response to layer 3 messages, the rrc configurator in the protocol stack which is the. The control plane includes the radio resource control layer rrc which is responsible for configuring the lower layers.
Huawei huawei e3372 lte usb stick product description. To ensure reliability, the network uses a double radio layer and redundant control nodes. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously. The driving force to further develop lte towards lteadvanced lte release10 was 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. Architecture rrc layer handles the main part of control signaling between ms and ran. Lte ue attachlte rrc connection setup log analysis lte video tutorials. The mac layer passes the received rlc pdus to the rlc layer. Rrc connection setup message dedicated info nas is used to transfer ue specific nas layer information between the network and the ue. May 22, 2016 we will go through ue logs and understand rrc connection setup procedure in detail. Points covered include a detailed description of various components of the radio interface.
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. View notes rrc layer from it 307 at bingham university. Lte is a trade mark of etsi currently being registered for the benefit of its members reception of the rrcconnectionsetup by the ue. When we switch the mobile it will be in idle mode until we receive. Sep 14, 2015 lte radio resource control rrc budi prasetyo.
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