The following data sets are available from the railroad commission of texas at free of charge. Lte attach procedure call flow the lte attach procedure call flow is a subject that may seem hard to understand. The radio resource control layer establishes a connection between the ue and the enodeb. This information is used to update the home subscriber server hss for ps and cs paging of the ue. Rrc connection management procedures paging, rrc connection establishment and release procedures. To do this, the various elements within the network communicate with each other and with the mobile device using welldefined protocols and procedures to accomplish the tasks and operations required. Start reading radio protocols for lte and lte advanced on the free kindle. From theory to practice provides the reader with a comprehensive systemlevel understanding of lte, built on explanations of.
Transmit receive data wcdma lte baseband signal generatorprocessor electricaltooptical converter opticaltoelectrical converter. It is a layer that exists between ue and enb and exists at the ip level layer 3network layer. Well first, the ue needs to register with the network to receive services that require registration. Myung 2 beyond 3g international mobile telecommunications imt2000 introduced global standard for 3g. The impact of the lte handover procedures on the overall user experience.
To switch between the states an rrc connection establishment and release procedure is defined. From an lte radio resource control rrc perspective. Good news is that basically there would be only two messages you have to dig into. Rrc connection setup rrc connection establishment involves signaling radio bearer 1 srb1 establishment. This document describes the functionalities for the support of otdoa location in lte as currently defined in 3gpp and oma.
Measurement configuration control, measurement config. This is followed up with rrc connection establishment signaling on the ulsch and dlsch. It will help developers and testing engineer to understand the feature better and utilize their knowledge in various customer sites. Different tasks and states of rrc protocol in lteeutran. Lte ue signalling conformance tests rf wireless world. During the lte initial attach procedure, the mobile equipment identity is obtained from the ue. This video explains ue registration or attach procedure. This procedure is initiated with a random access with a preamble. Ue capability information and rrc connection reconfiguration. Lte release 10 aligned with features up to release 15. The major functions of the rrc protocol include connection establishment and release functions, broadcast of system information, radio bearer establishment, reconfiguration and release, rrc connection mobility procedures, paging notification and release and outer loop power. This is the conventional data transmission procedure.
This registration is known as the network attachment. From theory to practice provides the reader with a comprehensive systemlevel understanding of lte, built on explanations of the theories which underlie it. Utran procedures elementary procedures paging rrc connection setup transaction reasoning authentication and security control transaction setup with rab allocation transaction clearing and rab release rrc connection release rrm procedures radio link addition and deletion intersystem handover from umts to gsm. Implementation of handling of rrc procedures in ue entity week 7. The control plane includes the radio resource control layer rrc which is responsible for configuring the lower layers. From the enodeb to the rrc, the rrc controls local phy. We will go through ue logs and understand rrc connection setup procedure in detail.
Establishing an rrc connection in lte typically involves the following steps. The mme operator may check the mobile equipment identity with eir. There are a good news and a bad news on rrc messages for carrier aggregation. Rrc messages are transported via the pdcpprotocol the major functions of the rrc protocol include. Rrc connection establishment is 3 way handshake procedure. You are find about lte ebooks by tag lte at an introduction to lte. Optimized lte data transmission procedures for iot. I will update this page as i need to handle the specific test cases.
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. Dec 02, 20 1 introduction this document provides the details of rrc procedures as specified in 3gpp 36. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously. In long term evolution lte, as with other cellular technologies, drive testing is a part of the network deployment and management life cycle from the early onset. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes.
Lte kpi hindiurdu best lecture for nokia,ericsson and huawei engineers wireless communication duration. Steps 3 and 4 of the ra procedure are used as part of the rrc. To maintain the perception of alwayson connectivity in lte during a csfb call, in addition to establishing. Lte rrc connection setup lte long term evolution medium. Sep 14, 2015 4g lte kpi key performance indicators training course what are lte kpis by telcoma global duration. Rrc connection establishment in lte all about wired and. The rrc connection release message is used to command the release of an rrc connection. Protocol specification eventstudio system designer sequence diagram based systems engineering tool. Nov 21, 20 radio link monitoring rlm is one of the important procedures in lte. Radio resource control rrc protocol writes the signaling messages that are exchanged between bs and mobile.
View notes 19080432 rrc procedures in lte commentsv1 from cse 570 at stony brook university. From an lte radio resource control rrc perspective, these calls could take place while the ue is in lte rrc idle state no active session or rrc connected state with an active session. In both cases, the information is processed by the following protocols before being passed to the physical layer for transmission. Rrc connection reconfiguration bearer setup, radio resource reconfig. This is usually the case of some internal data files, caches, temporary files etc. Ue must make the move to rrc connected mode before transferring any application data, or completing any signalling procedures. Layer 3 radio resource control protocol the rrc is large and complex, covering a number of functional areas. Radio protocols for lte and lte advanced pdf download. Ue states and state transitions including inter rat.
Implementation of handling of rrc procedures in rrc entity. How to verify your lte protocol and rf interactions. For initiating any nas procedure, the ue is required to establish an rrc connection with the enodeb. The conversion of the data and choice of conversion tools is the responsibility of the user. In lte, they are using separate security mode process for nas and rrc, whereas in wcdma only one security mode process rrc only was used nas is indirectly protected since nas message was embedded in rrc and protected as a part of rrc message. Prose function the device has to establish an rrc connection with the. Radio resource control rrc is the highest layer in the control plane of the access stratum as. Lte technology overview with public safety features. On the rrc level, the procedure of ppi transmission is defined according to fig. Start reading radio protocols for lte and lteadvanced on the free kindle. The radio resource control rrc protocol is used in on the air interface. Ue initiates a session to the enodeb using a random rarnti.
Figure 2 illustrates the rlf handover procedure, also known as the rrc. For the sidelink reception, the ue has to take essentially the same procedure. Radio imt advanced based on lte release 10 and beyond. Ue must make the transition to rrc connected mode before transferring any application data, or completing any signalling procedures.
Figure 1 shows a typical sequence of signaling messages. The figure below taken from tdoc r23859 captures the rlm process. 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. The purpose of this procedure, depicted in figure 8, is to request the resources from the network for its service needs. Rrc procedure and drx operation in lte networks are. Radio protocols for lte and lte advanced pdf download download it once and read it on your kindle device, pc, phones or tablets. Rrc connection request in lte rrc connection establishment is used to make the transition from rrc idle mode to rrc connected mode. Systems beyond imt2000 imtadvanced is set to introduce evolutionary path beyond 3g. Rrc connection establishment is 3 way handshake procedure comprising of following messages. Drive testing provides an accurate realworld capture of the rf environment under a particular set of network and environmental. Modification of control rrc data in enb and integration with uerecord and ue manager. Chapter 22 radio resource management muhammad kazmi 22. Difference in rrc procedures lte and 3g linkedin slideshare. 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.
Nov 15, 2012 1 introduction this document provides the details of rrc procedures as specified in 3gpp 36. Mobile class targets 100 mbps with high mobility and nomadic local area class targets 1 gbpswith low. Eutran, epc and eps definitions eps bearer structure 2. Lte ue attachlte rrc connection setup log analysis. Create default bearer request imsi, msisdn, apn, serving gw address serving gateway sends create default bearer request message to the pdn gw. Attach procedure may trigger one or multiple dedicated bearer establishment procedures to establish dedicated eps bearer for that ue. Once the random access procedure is successfully completed, next is rrc connection establishment procedure which configures srb1 for ue and let ue inform the network what exactly it wants i.
Radio resource control rrc radio protocols for lte and. Nov 19, 2017 the rrc states is a solution to the system access, power saving, and mobility optimization. On downlink, the mac in the ue interprets the transport format. Signaling provided the rrc layer has the following characteristics such as higher extensibility, secured transmission, reliable transmission and. Following is an example for rrc connection reconfiguration for lte advanced with focus on carrier aggregation. Protocol signaling procedures in lte lteadvanced radio layer 2 and rrc aspects. It is used to keep track of the radio link condition so that appropriate steps can be taken if radio link failure rlf is declared. Modification in the control messages specific apis has been done. Transmit receive data wcdmalte baseband signal generatorprocessor electricaltooptical converter opticaltoelectrical converter. This layer exists at the ip level and exists between ue and enb. The procedure for establishing an rrc connection is as follows. The long term evolution lte network is designed to deliver services and content to mobile subscribers quickly and with high quality. Transmission modes 1 single antenna, 2 transmit diversity, 3 ccd and 4 closedloop spatial multiplexing manually configurable dlul carrier frequencies. On the air interface, the rrc protocol is used in lte.
The main services and functions of the rrc sublayer include. Observed time difference of arrival otdoa positioning in. Otherwise, the ue initiates the tracking area update if it changed its tracking area since the last update. 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. The standardization process for lte comes out of the third generation partnership project 3gpp, which was. Protocol signaling procedures in lte radisys white paper 5 rrc connection and initial attach procedure after the random access procedure, if the ue is not already attached to the network it has to do so by initiating the attach procedure. It will help developers and testing engineer to understand the feature better andutilize their knowledge in various customer sites. Rrc expenditureswhere the money goes site policies site map jobs subscription services. I will just put some summary and tips for each of the test cases defined in the lte protocol conformance test specification. It is intended as a one stop guide to provide an overview of the otdoa feature for operators and manufacturers interested in the deployment. Protocol signaling procedures in lte lte advanced radio layer 2 and rrc aspects. The radio resource control rrc protocol is used in umts and lte on the air interface.
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