Desilva general counsel alexander schoch operations randall collins, coo. 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. Lte radio load versus user throughput draft 3 would be t1x instead. Rb control, mobility control, and ue measurement reporting. Lte agc rrc filter ad lna quadrature demodulation frequency converter rectangular filter transmitter receiver. Pdf overview of ltenr dual connectivity researchgate. Request pdf radio resource control rrc radio resource control rrc is the. Layer 3 radio resource control protocol the rrc is large and complex, covering a number of functional areas. Lte attach call flow in complete basic form youtube. More specifically, the following three srb types are defined in eutra 1. 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. Systems beyond imt2000 imtadvanced is set to introduce evolutionary path beyond 3g. With long term evolution lte comes a myriad of new and exciting attributes. Ue must make the transition to rrc connected mode before transferring any application data, or completing any signalling procedures.
Following is an example for rrc connection reconfiguration for lte advanced with focus on carrier aggregation. Nr can reselect to lte eutra and lte can reselect to nr while they are in idle state. Lte is the latest generation of the 3gpp standards. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. Create default bearer request imsi, msisdn, apn, serving gw address serving gateway sends create default bearer request message to the pdn gw. These protocols determine what radiospecific procedures are running.
Srb1 is used for transport of rrc messages including. Sae system architecture evolution is the corresponding evolution of the gprs3g packet core network evolution. Physicalcommunication32010217244 219 table 1 lte, lte advanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul. The maximum achievable user throughput, t1, depends on the user location in the cell, interference from other cells, number of transmit antennas, and so on. The interaction of nr rrc and lte rrc can be illustrated as follows. Rrc connection mobility including intrafrequency and interfrequency handover, associated security handling, i. A nw or ue vendor wishing to implementsupport the sstd measurement reporting must use the version. It is intended as a one stop guide to provide an overview of the otdoa feature for operators and manufacturers interested in the deployment. Overview of lte radio interface and radio network architecture for high speed, high capacity and low latency ntt docomo technical journal vol. The enodeb sends the rrc connection reconfiguration message including the eps radio bearer identity to the ue, and the attach accept message will be sent along to the ue. Check out this video for the 2nd 15 mins with 5g session with imtiyaz ali. It also includes the activation of security mode over the lte uu interface, the procedure which consists of putting mechanisms in place to encrypt the traffic and rrc signaling flows and to control the. Srb0 is used for transport of rrc messages associated with the common control logical channel.
Positioning architecture in lte networks positioning information exchange between the ue and the lte network is enabled by the lte positioning protocol. Physical layer carries all information from the mac transport channels over the air interface. Lte overview lte telecommunication mobile technology. Rrc connection establishment involves signaling radio. Mac, radio link control rlc, packet data convergence protocol pdcp, and radio resource control rrc. The estimated ue location is the intersection area of each set of the two hyperbolas i. The lte uu interface is the reference point between the mobile and the enb entity. Lets have a close look at all the layers available in eutran protocol stack which we have seen in previous chapter. Below is a more ellaborated diagram of eutran protocol stack.
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. Lte measurements lte l2l3mac rrc standards ts 36300. Module 5 wireless cellular and lte 4g broadband notes download. The enodeb derives the mme from the rrc parameters carrying the old gummei and the indicated selected network. Ue specific nas layer information between the network. Nr rrc does not only involved in nr but also in other radio access technology as well. Long term evolution protocol overview nxp semiconductors. Overview of the 3gpp long term evolution physical layer. Dedicated rrc signaling will indicate to the device, which subframes it has to monitor. The exploding growth of the internet and associated services has fueled the need for more and. The main requirements for the new access network are high spectral efficiency, high peak data rates, short round trip time as well as flexibility in frequency and bandwidth. In this second part of 15 mins with 5g we will start looking at the 3gpp specifications for 5g network architecture and learn how to refer the specs. An overview of lte positioning 7 spirent white paper positioning architecture in lte networks positioning information exchange between the ue and the lte network is enabled by the lte positioning protocol. Physicalcommunication32010217244 219 table 1 lte,lteadvanced,andimtadvancedperformancetargetsfordownlinkdlanduplinkul.
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. Transmit receive data wcdma lte baseband signal generatorprocessor. Lte attach procedure call flow the lte attach procedure call flow is a subject that may seem hard to. Overview long term evolution lte is the next step forward in cellular 3g services. Radio resource control rrc request pdf researchgate. The rrc layer performs the following functions such as broadcast of system information, paging, establishmentrelease of an rrc connection. Radio resource control rrc radio protocols for lte and lte. This procedure includes the paging, establishment, modification and release of the signaling radio bearer srb and the data radio bearer drb. Lpp is similar to protocols such as rrc, rrlp, and is801 already deployed in 2g and 3g networks2 time difference of arrival. This page describes overview of 5g nr pdcp layer including functions.
Reference architecture eutran architecture epc components, functions and interfaces mme sgw pdngw support information acronyms standards references lte, eps, eutran and epc 3gpp lte long term evolution, an evolution of gsmumts, specifies the next generation 3gpp mobile broadband network the mobile broadband network is called evolved. Rrc messages are transported via the pdcpprotocol the major functions of the rrc protocol include connection establishment and. Overview of the 3gpp long term evolution physical layer 1 1 introduction the 3gpp long term evolution lte represents a major advance in cellular technology. Lte is designed to meet carrier needs for highspeed data and media transport as well as highcapacity voice support well into the next decade. Most notably, the radio resource control rrc state of the ue determines the ue behavior and thus also the power consumption characteristics.
The goals for lte include improving spectral efficiency, lowering costs, improving services, making use of new spectrum and reformed spectrum opportunities, and better integration with other open standards. Mobile class targets 100 mbps with high mobility and nomadic local area class targets 1 gbpswith low. 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. Rrc procedure simple rrc states support of variable bandwidth 1. Takes care of the link adaptation amc, power control, cell search. Lte long term evolution or the eutran evolved universal terrestrial access network, introduced in 3gpp r8, is the access part of the evolved packet system eps. We will also cover 5g deployment scenarios from the specs as well as some of the informative web resources. Radio imt advanced based on lte release 10 and beyond. A signaling radio bearer is defined as a radio bearer that is only used for transmission of rrc and nas messages. Rrc performs functions like system information broadcast, paging, rrc connection management. Therefore, in en dc, to transport the rrc messages between.
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. Lteadvanced remains the correct description for specifications. The lteuu interface is the reference point between the mobile and the enb entity. Information on the current status of this and other etsi documents is available at. Module 4 radio resource management and mobility management. Lte overview 3 december, 2009 standard status 11 long term evolution release 8. How are control and data information sent to multiple mobiles.
This document describes the functionalities for the support of otdoa location in lte as currently defined in 3gpp and oma. Lte uu eutran mme s11 serving s5 gateway pdn gateway. The railroad commission of texas overview commission secretary callie farrar communications r. It covers pdcp architecture structure,entities,pdcp procedures for data transfer during transmitreceive operation,data pdu and control pdu formats of pdcp layer etc. 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. Protocol specification eventstudio system designer sequence diagram based systems engineering tool. Lte radio layer 2, rrc and radio access network architecture. 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. 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.
Lte provides downlink peak rates of at least 100mbits, 50 mbits in the. Except for scheduled mode, where the tx d2d ue needs to be rrc connected if tx ue is within network coverage, resource pool configuration is indicated in sib if tx ue is out of network coverage, the resource pool can be preconfigured. This interface supports radio resource control rrc signaling exchanged between the mobile and the enb entity, transmitted in the signaling radio bearer srb and the mobile traffic data ip. Rrc connection establishment in lte all about wired and. It is not possible in this blog to explain all the. The term lte is typically used to represent both lte and sae. Lte is backed by most 3gpp and 3gpp2 service providers who along with the other interested parties aim to complete and agree the eutran standards by q42007 and the epc by q12008. This interface supports radio resource control rrc signaling exchanged. 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.
Radio resource control an overview sciencedirect topics. The radio resource control rrc protocol is used in umts and lte on the air interface. How to verify your lte protocol and rf interactions. Introduction to otdoa on lte networks how does otdoa work 7 since each toa measurement. The main services and functions of the rrc sublayer include. The control plane includes the radio resource control layer rrc which is responsible for configuring the. It is a layer that exists between ue and enb and exists at the ip level layer 3network layer.
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