The standardization process for lte comes out of the third generation partnership. The procedure also fails if the ue completes a cell reselection prior to receiving the rrc connection setup message. But one should note, that some radio management functions scheduling, physical resource assignment for physical channels are handled by layer 1 and layer 2 autonomously. This registration is known as the network attachment. Dec 19, 2014 this video explains lte radio procedures, lte intial access and downlink physical channels, pssprimary synchronization signal,ssssecondary synchronization signal lte uplink physical channels. Pdf a case study on protocol stack integration for 3gpp lte. Some of the important paramenters in rrc connection request are establishment cause. 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. It is intended as a one stop guide to provide an overview of the otdoa feature for operators and manufacturers interested in the deployment. Systems beyond imt2000 imtadvanced is set to introduce evolutionary path beyond 3g. Ue must make the transition to rrc connected mode before transferring any application data, or completing any signalling procedures.
Pdcch order is a procedure to bring back uplink outofsync ue user equipment back to insync state incase there is downlink data availab. A method in a node b includes transmitting a rrc change command including a plurality of commands to a wireless transmitreceive unit wtru, and receiving an rrc change response from the wtru, wherein the rrc change command includes a command for performing a measurement gap configuration procedure and a command for performing. This procedure is initiated with a random access with a preamble. Radio imt advanced based on lte release 10 and beyond. I will just put some summary and tips for each of the test cases defined in the lte protocol conformance test specification. Know protocol stack of lte uu radio interface know the main physical rrc nas layer procedure know protocol conformance testing of 4g lte terminal. Handheld devices are growing exponentially and thus the need for the services on the move has increased tremendously.
Sr reestablishes the rrc connection between the ue and the enb, and user plane bearers. At this stage, ue does not have any resource or channel available to inform network about its desire to connect to it so it will send its request over the shared. Radio resource control rrc for lte signalling and procedure for interference avoidance frc indevice coexistence. This could be used to allow the delivery of an incoming sms or notification of an incoming voice call. Visualether protocol analyzer wireshark based visual protocol analysis and system design reverse engineering tool. Rrc connection establishment is 3 way handshake procedure comprising of following messages. How to verify your lte protocol and rf interactions. Establishing an rrc connection in lte typically involves the following steps lte rrc connection setup is published by eventhelix in lte long term evolution. The main services and functions of the rrc sublayer include.
Rrc connection setup rrc connection establishment involves signaling radio bearer 1 srb1 establishment. Random access procedure in lte all about wired and wireless. 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. Rrc connection establishment in lte all about wired and. It will help developers and testing engineer to understand the feature better and utilize their knowledge in various customer sites. At this stage, ue does not have any resource or channel available to inform network about its desire to connect to it so it will send its request over the shared medium. Different tasks and states of rrc protocol in lteeutran.
The establishment procedure fails if t300 expires before receiving an rrc connection setup message. Data transmission procedures for iot in lte, the transmission of data packets requires an established radio resource control rrc connection between the device and the evolved nodeb enb. Attach procedure may trigger one or multiple dedicated bearer establishment procedures to establish dedicated eps bearer for that ue. The radio resource control rrc protocol is used in umts and lte on the air interface. Pdf a case study on protocol stack integration for 3gpp. Narrowband iot data transmission procedures for massive. Us20080305797a1 us123,514 us351408a us2008305797a1 us 20080305797 a1 us20080305797 a1 us 20080305797a1 us 351408 a us351408 a us 351408a us 2008305797 a1 us2008305797 a1 us 2008305797a1 authority us united states prior art keywords ie message method wtru rrc prior art date 20070605 legal status the legal status is an assumption and is not a. In lte, the transmission or reception of new data tofrom a ue in rrc idle state requires the establishment of an rrc connection. 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. View notes 19080432 rrc procedures in lte commentsv1 from cse 570 at stony brook university. Lte rrc connection setup lte long term evolution medium. Protocol signaling procedures in lte lte advanced radio layer 2 and rrc aspects. The control plane includes the radio resource control layer rrc which is responsible for configuring the lower layers.
It is a layer that exists between ue and enb and exists at the ip level layer 3network layer. 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. Mobile class targets 100 mbps with high mobility and nomadic local area class targets 1 gbpswith low. This document describes the functionalities for the support of otdoa location in lte as currently defined in 3gpp and oma. It covers pdcp architecture structure,entities,pdcp procedures for data transfer during transmitreceive operation,data pdu and control pdu formats of pdcp layer etc. Otherwise, the ue initiates the tracking area update if it changed its tracking area since the last update.
The rrc connection release message is used to command the release of an rrc connection. It will help developers and testing engineer to understand the feature better andutilize their knowledge in various customer sites. Topics described here are as follows and more topics will be added. When an rrc connection has been established, the device is in rrc connected. 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. Nov 15, 2012 1 introduction this document provides the details of rrc procedures as specified in 3gpp 36. The purpose of this procedure, depicted in figure 8, is to request the resources from the network for its service needs. Physical layer carries all information from the mac transport channels over the air interface. Layer 3 radio resource control protocol the rrc is large and complex, covering a number of functional areas.
The rrc protocol for eutran is responsible for the basic configuration of the radio protocol stack. Protocol signaling procedures in lte lteadvanced radio layer 2 and rrc aspects. Takes care of the link adaptation amc, power control, cell search. But the procedure after step 2332 would be quite different among network. The figure below taken from tdoc r23859 captures the rlm process. The radio resource control rrc protocol is used in on the air interface. Sep 06, 2015 this feature is not available right now. Some preliminaries this description corresponds to the rurausplit branch for ran infrastructure components located in targetsdocsoai l1 l2 procedures. After rrc connection establishment, the ue transits to rrc connected state and the. The radio resource control layer establishes a connection between the ue and the enodeb. Random access procedure in lte all about wired and. The third generation partnership project 3gpp has recently initiated the long term evolution lte program to bring new technology, new network architecture and configurations and new applications and services to the wireless cellular network in order to provide improved spectral efficiency, reduced latency, faster user experiences and richer applications and services with less cost. Nov 19, 2017 the radio resource control rrc protocol is used in on the air interface.
Dec 02, 20 1 introduction this document provides the details of rrc procedures as specified in 3gpp 36. Myung 2 beyond 3g international mobile telecommunications imt2000 introduced global standard for 3g. The network triggers the rrc connection establishment procedure by sending a paging message. Lte uses the t300 timer to define how long the ue waits for a response to the rrc connection request message. Know protocol stack of lteuu radio interface know the main physicalrrcnas layer procedure know protocol conformance testing of 4glte terminal. The procedure is also used to transfer the initial nas message from the.
Difference in rrc procedures lte and 3g linkedin slideshare. Mar 24, 2020 radio resource control rrc for lte signalling and procedure for interference avoidance frc indevice coexistence. The flat network architecture for lte removes the requirement for these signalling procedures in the case of lte, the initial nonaccess stratum nas message is transferred as part of the rrc connection establishment procedure. The connection establishment progresses through the following phases. You can use this section and quick reference section as a kind of dictionary explaining fundamental concept of various signaling components. Below is a more ellaborated diagram of eutran protocol stack. Create default bearer request imsi, msisdn, apn, serving gw address serving gateway sends create default bearer request message to the pdn gw. Synchronization procedures and system acquisition pg. The next step is known as random access procedure in which the network for the first time knows that some ue is trying to get access. In lte, many of nas message is piggybacked on rrc messages. Protocol specification eventstudio system designer sequence diagram based systems engineering tool.
Radio link monitoring rlm is one of the important procedures in lte. Rrc performs functions like system information broadcast, paging, rrc connection management. 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. In the case of umts, the initial nas message is transferred after the rrc connection establishment procedure. A case study on protocol stack integration for 3gpp lte evolved node b. Nov 21, 20 radio link monitoring rlm is one of the important procedures in lte. During the lte initial attach procedure, the mobile equipment identity is obtained from the ue. Rrc messages are transported via the pdcpprotocol the major functions of the rrc protocol include connection establishment and. I will update this page as i need to handle the specific test cases.
Rrc connection establishment for lte is relatively simple compared to rrc connection establishment for umts. A method in a node b includes transmitting a rrc change command including a plurality of commands to a wireless transmitreceive unit wtru, and receiving an rrc change response from the wtru, wherein the rrc change command includes a command for performing a measurement gap configuration procedure and a command for. For initiating any nas procedure, the ue is required to establish an rrc connection with the enodeb. View notes 19080432rrcproceduresinltecommentsv1 from cse 570 at stony brook university. Rrc connection procedures is used to establish an rrc layer connection between the ue and utran. Optimized lte data transmission procedures for iot. The mme operator may check the mobile equipment identity with eir. A method and apparatus for radio resource control rrc messaging. Mac and layer 1 signaling has usually delays that are within 10 ms, whereas rrc signaling usually takes something around 100. Lte mobile optimization a definitive guide white paper. 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 control.
Ue initiates this procedure by sending rrc connection request message. 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. Rrc connection establishment involves signaling radio. Lte attach procedure call flow the lte attach procedure call flow is a subject that may seem hard to understand. Well first, the ue needs to register with the network to receive services that require registration. This video explains lte radio procedures,lte intial access and downlink physical channels, pssprimary synchronization signal,ssssecondary synchronization signal lte uplink physical channels. Lets have a close look at all the layers available in eutran protocol stack which we have seen in previous chapter. Reduced m2m signaling communications in 3gpp lte and future. Ue states and state transitions including inter rat. Its main feature is data transfer without establishment of radio resource. Observed time difference of arrival otdoa positioning in.
11 57 223 657 1064 167 733 295 79 1065 40 383 669 699 552 671 1423 977 165 25 1070 1147 1118 290 1445 500 538 448 965 646 1185 98 768 1198 498 1 401