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 (Long-Term Evolution) Layer 2/3 radio protocols as well as new features including LTE-Advanced. [4] Once the RRC connection is established, the UE requests the network to establish NAS Signaling connection, radio connection and S1 bearers by sending Service Request towards the MME. LTE Transmission Modes LTE basic operations & procedures. mobiles that are in RRC_IDLE! • Common Control CHannel (CCCH)! Carries messages on Signaling Radio Bearer 0, for mobiles that are moving from RRC_IDLE to RRC_CONNECTED in the procedure of RRC connection establishment. intro to ASN. RNTI assignment), including Data/Signalling Radio Bearers (DRB/SRB. The procedure is also used to transfer the initial NAS. Triggered by the NAS layers on attach,TAU,detach,paging,service request,extended service request. After RRC is established, network attached. RRC Procedures: System Information Acquisition Procedure, Connection Control. Tracking Area Update Procedure. By means of the signaling functions. prior to receiving the UE context information from the EPC. In response to receiving V2X support information, a radio terminal (100, 120) transmits, to the network (410), V2X terminal information indicating that the radio terminal (100, 120) is interested in the V2X service. UE Triggered Service Request in 4G LTE. LTE does not have an N300 parameter and the RRC Connection Request message is sent only once per establishment procedure. Figure 1 - LTE Backward Handover Procedure 2. Last updated: 2014-11-28. In practice this is obviously not as good as a handover. The UE sends a preamble on a random access channel, the network replies with corrected timing and resource assignments. Random Access Procedure: The UE uses a slotted aloha procedure to access the eNodeB. RRC Connection Setup RA procedure 5. Basic 4G. By means of the signaling functions. If the cell in Which the EU initiates the re-establishment is not Prepared (ie does not have a context for That EU), the E-UTRAN Will reject the procedure, Causing the EU to move to RRC_IDLE. After having been awaken, the UE performs RRC connection establishment procedure with the eNB from which the paging was sent. Vendor : NSN Note that not all the reestablishement messages are rejected. This is a special indentifier defining the quality of packet communication provided by LTE. Initial UE Message Connection Establishment 7. The TOEFL iBT ® Test. If the UE is unable to find a suitable cell, the UE eventually enters idle mode. The RRC connection establishment procedure is always initiated by the UE. Reception of RRCConnectionSetup or RRCConnectionReject. Optionally, the NW can include the IE extendedWaitTime for the purpose of Delay Tolerant access requests. It is used to make transition from RRC IDLE mode to RRC CONNECTED mode. -Appling features like EFD, and RAB Queuing to reduce drops & congestion. 0 - LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (3GPP TS 36. This document describes the functionalities for the support of OTDOA location in LTE as "Evolved Universal Terrestrial Radio Access (E-UTRA); "Radio Resource Control (RRC); Protocol specification". The interfaces are S11, S5, S8 and S4. The Service Drop Rate (All) KPI indicates the call drop rate of all the services in a cell or radio network, including the VoIP service. 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. Consulting | Training | ResearchCompany Confidential - Pinnacle Learning Center. RRC Connection re-establishment request This process starts when UE is in RRC_CONNECTED mode. 4 RRC Connection Re-establishment The purpose of this procedure is re-establish the RRC connection, which involvedresumption of SRB1 operation and re-activation of security. LTE uses the T300 timer to define how long the UE waits for a response to the RRC Connection Request message. The object of the procedure is to re-establish the RRC connection, which includes restoring SRB1 and reactivating the security. This message includes the IE waitTime which can be in the range from 0 to 16 seconds. Path management messages 2. Get this from a library! Radio protocols for LTE and LTE-advanced. RRC Connection Establishment. The following settings can only be changed when call status is Idle. There are two type of GTP-C messages are there. The Radio Resource Control (RRC) protocol is used in on the Air Interface. 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. 178 | GSM DSDS RR Signaling Message Channel Type = RACH (2) Direction = Uplink Message Type = Open Loop CMD ACK (129) Message Length in bytes = 24 L3 Message in Hex:17 49 06 1B 3E 46 04 F4 94 00 2A C8 00 0A 14 65 4A B8 00 00 81 00 05 9B Decoded Message: prot. On the air interface, the RRC protocol is used in LTE. UE POwer On Procedure-LTE Attach Procedure, UE Registration, Default Bearer Establishment. RNTI assignment), including Data/Signalling Radio Bearers (DRB/SRB. We will go through UE logs and understand RRC connection setup procedure in detail. The bearer can be default (usually Data QCI9) or dedicated (VoLTE QCI1). Intra and Inter-RAT handover signaling is covered in major detail. Time and Frame synchronization done. RRC Security Mode Command 9. In order to have signaling connection available to the UE, there needs to be CONNECTION MANAGEMENT. By means of the signaling functions. After RRC connection establishment, the UE transits to RRC Connected state and the eNB. power on the device. 2 Step 2: Transmission of the RRCConnectionRequest Message 58. UE is identified by temporary C-RNTI assigned in RACH Msg2. UE acknowledges the setup of SRBs and DRBs. txt) or read online for free. 00 Length: 3 DaysTroubleshooting LTE RAN Training – UE Based Troubleshooting LTE RAN Training is a UE based training course covering LTE network architecture, LTE air interface signaling procedures and methods, and LTE UE troubleshooting. RRC Procedures: System Information Acquisition Procedure, Connection Control. Responsible for scoping new requirements, implementing, unit testing and debugging idle mode procedures such as SIB, Cell selection and reselection, Connection establishment and release, inter-RAT. The QCI is a scalar that is used within the access network (namely the eNodeB) as a reference to node specific parameters that. Ve el perfil de Freddy Alexander Arias Bustamante en LinkedIn, la mayor red profesional del mundo. He decided to conduct inter ENodeB HO. AS Messages RRC, PDCP, RLC, MAC, Physical. The UE receiving RRC Connection Reconfiguration message -with any related action, for e. 2 Network and Cell Selection 187. The Radio Resource Control (RRC) protocol is used in on the Air Interface. As LTE moves to Flat and all IP networks, the signaling procedures change considerably from UMTS. the connection re-establishment procedure. RRC connection re‐establishment procedure. It involves verification of Conformance test scenarios for the RACH Procedure which is triggered by the device if it wants to move from RRC Idle mode to RRC Connected mode but does not have a PUSCH resource to send the request message nor does it have a PUCCH resource to send. 4 RRC Connection Re-establishment The purpose of this procedure is re-establish the RRC connection, which involvedresumption of SRB1 operation and re-activation of security. RRC Connection Setup RA procedure 5. Furthermore, we propose new approaches to mitigate involuntary delay by optimizing the procedures of the RRC state transition. -Improving the IRAT Handover, Soft Handover, Location Update, Paging, CSSR, PSSR, RRC Connection & RAB Establishment Success rate in my designated area for all Voice, Video Packet & High Speed, issuing capacity that needed. Signaling Radio Bearers(SRB) are defined as Radio bearers that are used only to transmit RRC and NAS messages. 3 - Responsible for end-to-end radio network RF and parameter optimization to reduce congestion and drops, improve the IRAT Handover, Soft Handover, Location Update, Paging, RRC Connection & RAB Establishment Success rate for all Voice, Video Packet & High Speed, issuing capacity requests whenever needed. X2-based Handover Procedure in 4G LTE. This feature is not available right now. In the RRC_IDLE state, there is no connection between the terminal and the eNodeB, which means. LTE Major Features Feature Capability Access modes FDD & TDD Channel BW (1RB = 12 subcarriers = 180 kHz) 1. The procedure is also started if the UE moves into new tracking area. Difference with 3G-RNC system in RRC Connection Establishment Procedure. The SRB will be used for the. Contention Resolution Procedure. So Random Access is used not only for initial access, but also after periods of uplink inactivity when uplink sync got lost in LTE_ACTIVE states. The SRB will be used for the signaling between the eNodeB and the UE. 321 "MAC" 3GPP TS 36. 단말이 RRC_connection 상태가 되거나, Cell 이 Release가 되면 해제가 된다. If you continue browsing the site, you agree to the use of cookies on this website. RRC Connection Reestablishment Success Rate: The re-establishment procedure is required in order to re-establish the lost RRC connection. The RRC Connection Request message is sent as part of the Random Access procedure. RNTI assignment), including Data/Signalling Radio Bearers (DRB/SRB. ; AS security comprises of the integrity protection of RRC signalling (SRBs) as well as the ciphering of RRC signalling (SRBs) and user plane data (DRBs). • Multicast Control Channel (MCCH): A point-to-multipoint downlink channel used for transmitting MBMS scheduling and control information from the. RRC Connection Setup Complete NAS: Service Request 6. Tyagi, Student Member, IEEE, Frank Aurzada, Ki-Dong Lee, Senior Member, IEEE,and Martin Reisslein, Fellow, IEEE Abstract—The connection establishment in Long-Term Evolu-tion Advanced (LTE-A) is often executed for distributed user. Attach, Service Request, Tracking area update etc. 3 TECHNICAL SPECIFICATION 136 331 V13. Mobility Management. Connection Establishment in LTE-A Networks: Justification of Poisson Process Modeling Revak R. 236 Section 4. The bearer can be default (usually Data QCI9) or dedicated (VoLTE QCI1). • When UE is in RRC_CONNECTED and RRC security is active, it can trigger Radio Link Failure (RLF) and initiate RRC connection re-establishment procedure upon (3GPP 36. RRC connection establishment is the process of establishing ECM connection. This protocol is specified by 3GPP in TS 25. Difference with 3G-RNC system in RRC Connection Establishment Procedure. , key/ algorithm change, specification of RRC context information transferred between network nodes; Establishment/ modification/ release of RBs carrying user data (DRBs). - For RRC Connection Establishment and RRC Connection Reestablishment the MSG3 is transferred on CCCH logical channel i. RRC Connection Setup RA procedure 5. Added configuration and user file support, PDCP security, RRC security mode command, SRB2 setup, RRC connection reconfiguration, MME EMM attach, MME ESM default bearer setup, and M-TMSI assignment to LTE_fdd_enodeb. pdf), Text File (. • DL data arrival during RRC_CONNECTED requiring random access procedure; • UL data arrival during RRC_CONNECTED requiring random access procedure; E. From a protocol stack perspective, the NAS is the highest stratum of the control plane, as shown in figure 1. 3 - Responsible for end-to-end radio network RF and parameter optimization to reduce congestion and drops, improve the IRAT Handover, Soft Handover, Location Update, Paging, RRC Connection & RAB Establishment Success rate for all Voice, Video Packet & High Speed, issuing capacity requests whenever needed. UE can start connection establishment procedure if the user starts the application for internet or email. The procedure is also started if the UE moves into new tracking area. Superior end-user experience: Optimized signaling for connection establishment and other air interface and mobility management procedures have further improved the user experience. LTE TECHNOLOGY RELATED LTE INTERVIEW QUESTIONS What is LTE Frame Structure? Configuration (FDD)Frame Type 1 (TDD) Frame Type 2 RRC connection establishment is Signaling Radio Bearer-1. E-UTRAN initiates the RRC connection release procedure to an UE in RRC_CONNECTED state The RRC CONNECTION RELEASE procedure with redirection information can also be used for CS-fallback to GERAN or UTRAN. Tracking Area Update Procedure. UE reads MIB & SIBs before E-UTRA connection establishment. There are two type of GTP-C messages are there. SMS over SGs is an interim solution to realize the transmission of native SMS from CS infrastructure over the LTE radio network. RRC Connection Request is very small in size in LTE as compared to 3G-RNC. RRC messages are transported via the PDCP-Protocol. mobility, measurements, physical config, radio config etc. OFDMA and SC-FDMA 2. 1-2: RRC re-establishment, fallback to RRC establishment, successful The purpose of this procedure is to re-establish the RRC connection. 5G Cybersecurity training Bootcamp is a combination of theoretical lectures and practical insight that helps participants gain in-depth knowledge about current and future state of 5G mobile technology, architecture, protocols and 5G cybersecurity. An RRC connection is established between the RRC layers of the UE and the eNB. The SRB will be used for the. the connection re-establishment procedure. 401 "EPS overall" 3GPP TS 24. Given the benefits of ANR in LTE, we foresee that procedures for relations establishment will be an important integrated part of 5G systems as well. 4 Attach Procedure 191. UE and network both can initiate the RRC connection establishment procedure. The UE initiates the procedure when upper layers request establishment of an RRC connection while the UE is in RRC_IDLE and it has acquired essential system information as described in 5. Always initiated by UE, ( though can be triggered by nw by DL paging). Section 9: Security in 4G LTE. 27 at RRC layer. , key/ algorithm change, specification of RRC context information transferred between network nodes; Establishment/ modification/ release of RBs carrying user data (DRBs). 3 - Responsible for end-to-end radio network RF and parameter optimization to reduce congestion and drops, improve the IRAT Handover, Soft Handover, Location Update, Paging, RRC Connection & RAB Establishment Success rate for all Voice, Video Packet & High Speed, issuing capacity requests whenever needed. RRC connection establishment is 3 way handshake procedure comprising of following messages. The following example shows Tracking Area Update procedure when UE changes the MME but maintains the Serving Gateway. 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. It is used to make transition from RRC IDLE mode to RRC CONNECTED mode. • Designed and implemented RRC Re-establishment procedure at RRC layer. Definition The S1SIG Connection Setup Success Rate KPI is defined in Table 1. Reception of RRCConnectionSetup or RRCConnectionReject. At the NAS Layer, the UE stores the EPS Bearer ID and links the dedicated bearer to the default bearer. RRC Connection Reestablishment Success Rate: The re-establishment procedure is required in order to re-establish the lost RRC connection. The attach procedure may trigger one or multiple dedicated bearer establishment procedures to establish dedicated EPS bearer for that UE. 2 Relationship with Other Procedures 190. E-UTRAN completes RRC connection establishment prior to completing the establishment of the S1 connection, i. Attach, Service Request, Tracking area update etc. The purpose of this procedure is to re-establish the RRC connection to continue RRC connection, which involves the resumptions of SRB1 operation and the re-activation of security. · In LTE, RRC CONNECTION RECONFIGURATION can also be used to send NASdedicated signalling to the UE to reduce the latency whereas this option is not available in 3G · LTE has only one RRC connected mode state ( RRC _ CONNECTED ), so it has only one Temporary Radio Network Temporary Identity (RNTI) i. 0 (2020-04) Reference RTS/TSGR-0236331vf90 Keywords LTE ETSI 650 Route des Lucioles. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. RRC IDLE:- …. 2 TTCN -3 for LTE Device Protocol RRC Connection Request RRC Connection Setup RRC Connection Setup Complete RRC_Conn_Est_Success TTCN-3 Procedure Library 13. The eNodeB derives the MME from the RRC parameters carrying the old GUMMEI and the indicated Selected Network. OFDMA and SC-FDMA 2. – Procedures: Synchronization, Relaying operation RRC connection re-establishment procedure). One of the triggers described in clause 5. Stage 1 for Multimedia Soec and Multicast Service. As long the eNB is functioning properly, the S1 setup will stay intact. In response to receiving V2X support information, a radio terminal (100, 120) transmits, to the network (410), V2X terminal information indicating that the radio terminal (100, 120) is interested in the V2X service. Connection establishment, broadcast of system information, paging notification, outer loop power control- are some of the major functions of the RRC protocol. LTE E-UTRAN and its Access Side Protocols | Radisys White Paper 6 Cell Search Cell search is the procedure by which a UE acquires time and frequency synchronization with a cell and detects the cell ID of that cell. RRC Procedures in LTE Comments v1 - Free download as PDF File (. GapPatternType. [4] Once the RRC connection is established, the UE requests the network to establish NAS Signaling connection, radio connection and S1 bearers by sending Service Request towards the MME. 1 RRC CONNECTION ESTABLISHMENT RRC connection establishment is used to make. Furthermore, we propose new approaches to mitigate involuntary delay by optimizing the procedures of the RRC state transition. Attach, Service Request, Tracking area update etc. DL synchronization 3. 11 Power-On and Power-Off Procedures 185. Modify Bearer Request 8. Step 5: RRC Connection Setup: eNB will send DL-SCH message to UE to create a SRB. UE POwer On Procedure-LTE Attach Procedure, UE Registration, Default Bearer Establishment. RRC Connection Establishment: The UE and the eNodeB then interact to establish a Signaling Radio Bearer (SRB). Once the UE has obtained temporary resources via MSG2 in RACH process, its now ready to send 'RRC connection request' message using UL-SCH to eNodeB. • If the LTE paging procedure is for PS data call, UE includes service request NAS message within RRC connection setup complete message. The device or UE needs to let the core network(s) know that it is switched on and active. Support the RRC connection re-estabilishment procedure to resume the RRC connection after RL failure; Supports speed-dependant scaling of measurement-releated parameters, by performing mobility state detection; Supports signaling and measurements for handovers to and from other RATs, such as cdma2000HRPD, 1XEVDO, UTRAN and GERAN. The always on IP connectivity for UE of the EPS is enabled by establishing a default EPS bearer during Network attachment. The attach procedure may trigger one or multiple dedicated bearer establishment procedures to establish dedicated EPS bearer for that UE. A method, comprising: establishing a radio resource control (RRC) connection by a user equipment (UE) with a master base station (MeNB) in a mobile communication network; communicating with both the MeNB over at least a primary cell (PCELL) and a secondary base station (SeNB) over at least a secondary cell (SCELL), wherein the UE has dual connectivity capability. establishment procedure. RRC Connection Re-establishment Procedure on the UE side IV. RRC Connection Reconfiguration 11. UE must make the transition to RRC Connected mode before transferring any application data, or completing any signalling procedures The RRC connection establishment procedure is always initiated by the UE but can be triggered by either the UE or the network. Get this from a library! Radio protocols for LTE and LTE-advanced. enabling the UE to be served by an MME while the UE is in the "attach" procedure; (NAS) messages, paging, establishment and release of the RRC connection, security key management, handover, UE. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. AS Messages RRC, PDCP, RLC, MAC, Physical. · In LTE, RRC CONNECTION RECONFIGURATION can also be used to send NASdedicated signalling to the UE to reduce the latency whereas this option is not available in 3G · LTE has only one RRC connected mode state ( RRC _ CONNECTED ), so it has only one Temporary Radio Network Temporary Identity (RNTI) i. The mobility of UE is handled by the handover procedure. Summary: eNodeB Startup and RRC Connection Establishment lte-enodeb-s1-startup-sib-rrc-connection. 1 Introducing the LTE network The LTE architecture and its security model were initially de ned in 3GPP Release 8, in 2008. Published on December 8, 2018 December 8, 2018 • 108 Likes • 7 Comments. -Appling features like EFD, and RAB Queuing to reduce drops & congestion. In LTE, the UE is RRC_Idle and from an EPS Mobility Management (EMM. The procedure. UE Timer and Constant Parms. In our design, we assume a Software Defined Networking-based architecture for 5G system. 214 « Next step after PLMN and cell selection is network registration or attach. 5 UE Triggers RRC Connection Re-establishment to Another Cell in a Different eNodeB. LTE Access Class Barring. As you see the contents below, main purpose of RRC Connection Setup message is to specify the MAC/RLC/PHY setup for SRB 0 and SRB 1 bearer. Introduction. Good Awareness about LTE Architecture, Protocols, Call set up and Call Processing Scenarios (MO/MT), Attach & Detach Procedures, Handovers. One example of RRC Connection Setup is as follows. LTE Core Network. For technical details on LTE and a list of its designated operating frequencies, bands, and roaming possibilities, see LTE frequency bands. RRC Conn Comp + Detach (power off). UE acknowledges the setup of SRBs and DRBs. LTE Rrc Connection Attach Procedure. 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. API design completed ( header files for system information , Paging and other call control procedure example : RRC Connection establishment , RRC connection release , RRC connection re establishment etc. The main change from UMTS is that EPS allows concatenation of some procedures to allow faster establishment of the connection and the bearers. So the Tracking Area Update Request message is sent within the RRC Connection Setup Complete message. The eNB allocates the network resource based on the received radio configuration and initiates an RRC connection towards the UE by sending RRC Connection Setup. A method for performing a radio resource control (RRC) connection re-establishment procedure by a user equipment (UE) in a wireless communication system, the method comprising: entering an RRC connected state; receiving an RRC connection re-establishment condition; determining whether the RRC connection re-establishment condition is satisfied based on a measurement. 4) Handover Completion: The target eNB receives the RRC Connection Reconfiguration Complete message and the path switch procedure is initiated between the target eNB and the MME/S-GW. RRC : RRC Connection. Now it is fairly obvious to see how all these tie together. Moreover, the new emerging technology components of 5G such as massive beamforming expand the scope of relations beyond the neighbor relations of LTE. In case E-UTRAN accepts the re-establishment, SRB1 operation resumes while the operation of other radio. Always initiated by UE, ( though can be triggered by nw by DL paging). Network sends RRC Connection Release with Redirection to LTE cell and UE is forced to go back to LTE cell as soon as it finish the voice call. After establishing an RRC connection, the UE can send an attach request message to the MME. He decided to conduct inter ENodeB HO. As long the eNB is functioning properly, the S1 setup will stay intact. Attacker Device IMSI = 1. Let us study 2 modes of RRC before going further- UE operates in 2 RRC modes-. 331 for UMTS, it is specified by 3GPP. Triggering of Connection Establishment. Based on these two aspects. Furthermore, to enhance the explanations, the course incorporates real use cases and examples through the use of Mpirical's Net X virtual network analyzer. Good Awareness about LTE Architecture, Protocols, Call set up and Call Processing Scenarios (MO/MT), Attach & Detach Procedures, Handovers. In order to have signaling connection available to the UE, there needs to be CONNECTION MANAGEMENT. The UE sends a preamble on a random access channel, the network replies with corrected timing and resource assignments. Once UE comes up a radio resource control (RRC) connection is established for communication with the network. 7 UE Capability Transfer 65 3. SAM PAGING Bearer Establishment on the Callee side Alerting3. In the case of UMTS, the initial NAS message is transferred after the RRC connection establishment procedure. The procedure of RRC connection between UE and eNB is as follows. For a UE in this state, there exists a signalling connection between the UE and the MME. A 3-way handshake is used to move the UE into RRC connected mode; Figure 107 - Signalling for RRC connection establishment. RLF handover is UE-based mobility and provides a recovery mechanism when the backward handover signaling with the. 4 Communication Protocols 5 1. RRC Connection Establishment procedure. enabling the UE to be served by an MME while the UE is in the "attach" procedure; (NAS) messages, paging, establishment and release of the RRC connection, security key management, handover, UE. This layer exists at the IP level and exists between UE and eNB. Keywords: 5G, Mobility, MobilityState Estimation, DualConnectivity, Handover Failure, Radio Link Failure. RRC Connection Re-establishment Procedure on the UE side IV. LTE rrc connection establishment is used to make transition from rrc idle to rrc connected state 2. -Improving the IRAT Handover, Soft Handover, Location Update, Paging, CSSR, PSSR, RRC Connection & RAB Establishment Success rate in my designated area for all Voice, Video Packet & High Speed, issuing capacity that needed. Once established, the connection is used when delivering messages to the RRC layers or their upper layers, NAS layers, in the control plane. During RRC connection re-establishment procedure. The mobility of UE is handled by the handover procedure. Good Awareness about LTE Architecture, Protocols, Call set up and Call Processing Scenarios (MO/MT), Attach & Detach Procedures, Handovers. The contention based RA Procedure is used for: transition from RRC_IDLE to RRC Connected(RRC Connection Establishment) in RRC_CONNECTED when UL data has to be sent and UL Synchronisation state is "non-synchronised" Note: the UL synchronisation state is changed to non-synchronised after the expiry of the TimeAlignmentTimer. Fortunately, the NR RRC protocol pretty much looks like the LTE RRC protocol from a procedural point of view. Given the benefits of ANR in LTE, we foresee that procedures for relations establishment will be an important integrated part of 5G systems as well. pdf), Text File (. Let us study 2 modes of RRC before going further- UE operates in 2 RRC modes- 1. LTE Rrc Connection Attach Procedure - Free download as Word Doc (. sub-layer of Long Term Evaluation (LTE) User Equipment (UE) terminal. 3 RRC Connection Establishment 189. NAS Messages for both EMM and ESM. This article explains the details about the RRC setup procedure and the common failures seen at the RRC phase. Cell search performed. 331 Section 10. SR reestablishes the RRC connection between the UE and the eNB, and user plane bearers. LTE RRC, PDCP and RLC Layers RRC procedures including system info broadcasting, paging, RRC connection establishment, security establishment, NAS message transport and RRC connection reconfiguration Types of radio bearers RRC connection establishment: from RRC Idle to RRC Connected. Recommended Value. power on the device. 5G Cybersecurity training Bootcamp is a combination of theoretical lectures and practical insight that helps participants gain in-depth knowledge about current and future state of 5G mobile technology, architecture, protocols and 5G cybersecurity. 27 at RRC layer. This feature is not available right now. multiple Dedicated Bearer Establishment procedures to establish dedicated comes up a radio resource control (RRC) connection is established for communication with the network. UE initiates this procedure by sending RRC Connection Request message. The research of RRC connection establishment and co-simulation of SDL and TTCN Abstract: This paper introduces and analyzes the LTE RRC sub-layer protocol stack structure and function, designs the state and the state conversion process of the RRC sub-layer. Radio Resource Control protocol (RRC) System information broadcasting, paging; RRC connection establishment, RRC states; Default/signalled configuration of Signalling/Data Radio Bearers; UE capabilities, Feature Group Indicators; RRC connection reconfiguration procedure (incl. RRC connection procedures is used to establish an RRC layer connection between the UE and UTRAN. ENB can reject the RRC connection establishment based on its admission control algorithm. However, you can start preparing yourself slowly but with important points so that you understand technology and know the basic answers,. Seamless Connection: LTE will also support seamless connection to existing networks such as GSM, CDMA and WCDMA. The UE shall store the QoS Negotiated, Radio Priority, Packet Flow Id and TI, which it received in the Session Management Request, for use when accessing via GERAN or UTRAN. RRC Connection re-establishment request This process starts when UE is in RRC_CONNECTED mode. message pair to establish the radio connection. Modify Bearer Response 10. If the UE is unable to find a suitable cell, the UE eventually enters idle mode. Tunnel management messages. Attach, Service Request, Tracking area update etc. Reception of RRCConnectionReject while performing RRC connection establishment. Radio Resource Control (RRC)). -Appling features like EFD, and RAB Queuing to reduce drops & congestion. As long the eNB is functioning properly, the S1 setup will stay intact. RRC Connection Reconfiguration Complete. RRC Connection re-establishment request This process starts when UE is in RRC_CONNECTED mode. A base station apparatus (130, 220) in a network (410) transmits V2X support information indicating that a V2X service is supported by the network (410). In the case of LTE, the initial Non-Access Stratum (NAS) message is transferred as part of the RRC connection establishment procedure. 331 NR Radio Resource Control (RRC) 24. The cell, operating on the primary frequency, in which the UE either performs the initial RRC connection establishment procedure or initiates the RRC connection re-establishment procedure, or the cell indicated as the primary cell in the handover procedure. 3 TECHNICAL SPECIFICATION 136 331 V13. UE Triggered Service Request in 4G LTE. UE--->eNB [ RRC connection request ] UE sends an 'RRC connection request' to eNB (Establishment Cause=“Mobile Originating Signalling”). This message will have configuration parameter for RLC, UL-SCH, Power Head Room and Uplink Power Control. The network can also initiate the connection establishment procedure by sending a paging message. • Fixed various issues with respect to RRC by performing unit testing. This chapter describes the procedures that a mobile follows after it switches on, to select a cell and register its location with the network. RRC Connection Establishment procedure lets user inform network what it wants to do- attach, tracking area update, service request etc. For CSFB, there will always be an RRC connection established in order to exchange signalling. 3 - Responsible for end-to-end radio network RF and parameter optimization to reduce congestion and drops, improve the IRAT Handover, Soft Handover, Location Update, Paging, RRC Connection & RAB Establishment Success rate for all Voice, Video Packet & High Speed, issuing capacity requests whenever needed. Please try again later. Figure 8: RRC Connection Setup RRC connection establishment involves Signaling Radio Bearer 1 (SRB1) establishment. Initial UE Message Connection Establishment 7. T300 (RRC Connection Timer) Timer Start Stop At expiry. docx), PDF File (. This course therefore sets out to provide a detailed explanation of the LTE protocols that can be found within the E-UTRA, E-UTRAN and EPC. > Registering for an EPS services after an inter RAT changed( From GERAN/UMTS to LTE). Radio Resource Control (RRC) Protocol RRC procedures including system info broadcasting, paging, RRC connection establishment, security establishment, NAS message transport and RRC connection reconfiguration Types of radio bearers RRC States & State Transitions. The main services and functions of the RRC sublayer include broadcast of System Information related to the non-access stratum (NAS), broadcast of System Information related to the access stratum (AS), Paging, establishment, maintenance and release of an RRC connection between the UE and E-UTRAN, Security functions including key management. This message will have configuration parameter for RLC, UL-SCH, Power Head Room and Uplink Power Control. S1 Based Handover in 4G LTE. Triggering of Connection Establishment. The security aspects of LTE are detailed in the speci cation TS 33. 2 Evolutionary Path of 3GPP Systems 4 1. RRC Security Mode Complete AS security setup 10. LTE uses the T300 timer to define how long the UE waits for a response to the RRC Connection Request message. NAS Messages for both EMM and ESM. -Improving the IRAT Handover, Soft Handover, Location Update, Paging, CSSR, PSSR, RRC Connection & RAB Establishment Success rate in my designated area for all Voice, Video Packet & High Speed, issuing capacity that needed. Please help to root cause and give us your recommendations. stop T310 2. 5 UE Triggers RRC Connection Re-establishment to Another Cell in a Different eNodeB. For CSFB, there will always be an RRC connection established in order to exchange signalling. E-UTRAN initiates the RRC connection release procedure to an UE in RRC_CONNECTED state The RRC CONNECTION RELEASE procedure with redirection information can also be used for CS-fallback to GERAN or UTRAN. AS Messages RRC, PDCP, RLC, MAC, Physical. RRC Procedures: System Information Acquisition Procedure, Connection Control. UE also requests PDN connectivity along with the attach request. - The Cell Change order (CCO) procedure with Network Assisted Cell Change (NACC) is an alternative to the RRC Connection Release with Redirection procedure used for CS Fallback. RRC connection establishment is 3 way handshake procedure comprising of following messages. Vehicular paging procedure for relay cell selection in LTE system. Now it is fairly obvious to see how all these tie together. has a valid UE context. EPC (CN) LTE, EPC basic protocols, providing a call service to an LTE user via IMS. 4 UE Triggers RRC Connection Re-establishment to Another Cell in Same eNodeB 96 6. LTE uses the T300 timer to define how long the UE waits for a response to the RRC Connection Request message. IMS architecture: main functional elements, user identification, registration scenarios, session establishment 10. 1 Introducing the LTE network The LTE architecture and its security model were initially de ned in 3GPP Release 8, in 2008. It covers LTE signaling architecture, system acquisition procedures, and connection. 1 RRC CONNECTION ESTABLISHMENT RRC connection establishment is used to make. The paging (connection establishment and release procedure initiated by E-UTRAN) procedure on Uu and S1 interface is shown in Figure 26. LTE Priority Access Mechanism. 3 - Responsible for end-to-end radio network RF and parameter optimization to reduce congestion and drops, improve the IRAT Handover, Soft Handover, Location Update, Paging, RRC Connection & RAB Establishment Success rate for all Voice, Video Packet & High Speed, issuing capacity requests whenever needed. Please help to root cause and give us your recommendations. -Improving the IRAT Handover, Soft Handover, Location Update, Paging, CSSR, PSSR, RRC Connection & RAB Establishment Success rate in my designated area for all Voice, Video Packet & High Speed, issuing capacity that needed. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. 2- RRC Connection Control: includes procedures for establishment, modification and release of RRC connections for paging, security activation, Signaling Radio Bearers (SBRs), Data Radio Bearers (DRB), handover, and other functions such as configuration of lower protocol layers. The EPS Bearer the network establishes during LTE attach procedure, is the default Bearer. SIB decodi…. The purpose of this procedure, depicted in Figure 8, is to request the resources from the network for its service needs. RACH Procedure Flow 1. LTE Timers Function at Start/Stop/Expiry; T300 >>Starts at the RRC connection REQ transmit >>Stops at the Receipt of RRC connection setup or reject message OR at the cell reselection time OR upon abortion of connection establishment by Higher layers (L2/L3). According to the 3GPP TS 36. Achieve & maintain the RN Performance as per the contracted KPIs (Accessibility, Retainability and Mobility & Service Integrity). 5G cybersecurity training bootcamp is a 4-day courses focuses on 5G cybersecurity issues and mitigation techniques. With the introduction of LTE came the development of a new radio technology based on OFDMA / SC-FDMA. RRC Connection Request RACH Msg3 adalah message pertama dari prosedur RRC Connection establishment. After the UE has completed the RRC Connection which has been explained in my previous article, LTE KPI Optimization: RRC Success Rate, it needs to get a Bearer assigned to it to initiate services. 2 GPRS/EDGE 6 1. 1) You mentioned in one of your comments dated 26th August 2013 that "Once the RRC Connection Re-establishment procedure is triggered, the UE shall start the timer T311, and once the UE selects a suitable cell, this T311 timer is stopped, and RRC initiates the transmission of RRC Connection Re-establishment message and start the timer T301. FFS Piggybacking of NAS messages in other procedures than bearer establishment or modification or release. Section 9: Security in 4G LTE. If the cell in Which the EU initiates the re-establishment is not Prepared (ie does not have a context for That EU), the E-UTRAN Will reject the procedure, Causing the EU to move to RRC_IDLE. prior to receiving the UE context information from the EPC. Good Awareness about LTE Architecture, Protocols, Call set up and Call Processing Scenarios (MO/MT), Attach & Detach Procedures, Handovers. Modify Bearer Request 8. eNodeB assigns a C-RNTI and sends timing adjustment to the. The integrity protection algorithm is common for signalling. • Design and implementation of RRC procedures in LTE small cell protocol stack on Freescale RDB 9131. Network sends RRC Connection Release with Redirection to LTE cell and UE is forced to go back to LTE cell as soon as it finish the voice call. RRC CONNECTION REQUEST TILL ESTABLISHMENT OF DEFAULT RADIO BEARER 2012 Nov 1 05:20:05. He decided to conduct inter ENodeB HO. Furthermore, we propose new approaches to mitigate involuntary delay by optimizing the procedures of the RRC state transition. The security aspects of LTE are detailed in the speci cation TS 33. UE Paging Procedure. RRC Connection Setup RA procedure 5. 401 "EPS overall" 3GPP TS 24. 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. 1 Network Selection 187. The LTE nodes MME and SGW are different for the source and target cell. 331) and NR RRC (3GPP 38. GSM Attach ProcedureGSM initial attach to the network, step by step messages from Network <=> MS 1. mobiles that are in RRC_IDLE! • Common Control CHannel (CCCH)! Carries messages on Signaling Radio Bearer 0, for mobiles that are moving from RRC_IDLE to RRC_CONNECTED in the procedure of RRC connection establishment. 2 Relationship with Other Procedures 190. Tunnel management messages. Once established, the connection is used when delivering messages to the RRC layers or their upper layers, NAS layers, in the control plane. 5G Cybersecurity training Bootcamp is a combination of theoretical lectures and practical insight that helps participants gain in-depth knowledge about current and future state of 5G mobile technology, architecture, protocols and 5G cybersecurity. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. E-UTRAN completes RRC connection establishment prior to completing the establishment of the S1 connection, i. If AS security has not been activated, the UE doesn't initiate this procedure, instead, it moves to RRC_IDLE directly. • Designed and implemented RRC Re-establishment procedure at RRC layer. EPC (CN) LTE, EPC basic protocols, providing a call service to an LTE user via IMS. AS Messages RRC, PDCP, RLC, MAC, Physical. This layer exists at the IP level and exists between UE and eNB. The random access procedure is characterized by: - Common procedure for FDD and TDD; - One procedure irrespective of cell size and number serving cells when CA is configured; The random access procedure is performed for the following six events: - Initial access from RRC_IDLE; - RRC Connection Re-establishment procedure; - Handover;. 5-1 "E-UTRA Operating Bands" and 5. pdf UE2 UE1 eNodeB MME LTE eNodeB startup and UE setup (summary) This sequence diagram describes how an eNodeB performs an S1 setup with the EPC and then initiates MIB and SIB broadcast to the UEs. The procedure of RRC connection between UE and eNB is as follows. The purpose of this procedure is to re-establish the RRC connection to continue RRC connection, which involves the resumptions of SRB1 operation and the re-activation of security. 3 Radio Resource Control (RRC) 47 3. 단말이 RRC_connection 상태가 되거나, Cell 이 Release가 되면 해제가 된다. An overview of D2D in 3GPP LTE standard. By means of the signaling functions. Given the benefits of ANR in LTE, we foresee that procedures for relations establishment will be an important integrated part of 5G systems as well. The main difference is that the UE is moved to the target RAT whilst in RRC Connected Mode, also MME can get some response(UE Context Required) from GSM so as to. 1 Power-On Sequence 185. T300 (RRC Connection Timer) Timer Start Stop At expiry. It is very important in the aspects of maintaining the reliability o f radio link and ensuring continuity of service. Responsible for scoping new requirements, implementing, unit testing and debugging idle mode procedures such as SIB, Cell selection and reselection, Connection establishment and release, inter-RAT. 27 at RRC layer. 2 System Information 50 3. Please fill all the fields Passwords do not match Password isn't strong enough. Reference: 3GPP TS 36. RRC connection re-establish involves the resumption of SRB1 operation and re-activation of security upon detecting radio link failure or handover failure. 3 UE Radio Link Failure Triggers RRC Connection Re-establishment 95 6. Figure 8: RRC Connection Setup RRC connection establishment involves Signaling Radio Bearer 1 (SRB1) establishment. Figure 1 - LTE Backward Handover Procedure 2. RRC Connection re-establishment request This process starts when UE is in RRC_CONNECTED mode. This includes completing an IMSI attach as part of TAU procedure. Initial Context Setup Request RRC connection establishment 8. The number of the attempt HO calculated at the source cell. ETSI 3GPP TS 36. RRC IDLE:- …. UE POwer On Procedure-LTE Attach Procedure, UE Registration, Default Bearer Establishment. An RRC connection is established between the RRC layers of the UE and the eNB. The signalling for RRC connection establishment is shown in Figure 107. Consequently, AS security is not activated during the initial phase of the RRC connection. But this procedure can be triggered by both UE and Network. Like every technology, LTE has many KPIs that need to be maintained and optimized. The difference between primary and secondary cell in LTE is given below. RRC Procedures: System Information Acquisition Procedure, Connection Control. A re-establishment is initiated upon detecting radio link failure, handover failure, mobility failure, integrity check failure and when. UE Triggered Service Request in 4G LTE. 1 RRC CONNECTION ESTABLISHMENT RRC connection establishment is used to make. RRC connection establishment is 3 way handshake procedure comprising of following messages. apply the default MAC main configuration. The UE sends a preamble on a random access channel, the network replies with corrected timing and resource assignments. RRC Connection Reestablishment Success Rate: The re-establishment procedure is required in order to re-establish the lost RRC connection. h:1695 ns3::LteRrcSap::ReportConfigEutra::MS1024. Connection Establishment in LTE-A Networks: Justification of Poisson Process Modeling Revak R. UE in this state are in RRC IDLE mode and do not have S1 connectivity with MME. Radio Resource Control (RRC)). Triggering of Connection Establishment. RRC Connection Establishment procedure. When compared with current LTE scheme, our procedure reduces significantly the signaling load generated by M2M UEs small transmissions. So let's break it down. 1 Network Selection 187. -Improving the IRAT Handover, Soft Handover, Location Update, Paging, CSSR, PSSR, RRC Connection & RAB Establishment Success rate in my designated area for all Voice, Video Packet & High Speed, issuing capacity that needed. A method for performing a radio resource control (RRC) connection re-establishment procedure by a user equipment (UE) in a wireless communication system, the method comprising: entering an RRC connected state; receiving an RRC connection re-establishment condition; determining whether the RRC connection re-establishment condition is satisfied based on a measurement. When anything happens where UE need to trigger RRC Connection Re-establishment process as described above, UE sends RRC Connection Re-establishment Request with the cause of one of the followings (36. 2 System Information 50 3. RLC, MAC, PHY. LTE channels and signals 2. RRC connection establishment is 3 way handshake procedure comprising of following messages. The Radio Resource Control (RRC) protocol is used in on the Air Interface. NAS Messages for both EMM and ESM. RAB Assignment Response While RAB setup is in progress, MSC may have already started network side signaling (like talking to HLR to get routable number for dialed mobile number and ISUP call establishment with target MSC, or ISUP call establishment if the dialed number belong to PSTN or another non-GSM/UMTS number). Initial UE Message Connection Establishment 7. The UE shall store the QoS Negotiated, Radio Priority, Packet Flow Id and TI, which it received in the Session Management Request, for use when accessing via GERAN or UTRAN. Receive an RRCConnectionSetupComplete message from a UE during an RRC connection establishment proced Definition: lte-rrc-sap. 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. The network can also initiate the connection establishment procedure by sending a paging message. 1 Power-On Sequence 185. [7] 3GPP TS 36. The UE initiates a TAU procedure by sending, to the eNodeB, a Tracking Area Update Request message together with RRC parameters indicating the Selected Network and the old GUMMEI. It involves verification of Conformance test scenarios for the RACH Procedure which is triggered by the device if it wants to move from RRC Idle mode to RRC Connected mode but does not have a PUSCH resource to send the request message nor does it have a PUCCH resource to send. Section 9: Security in 4G LTE. Summary: eNodeB Startup and RRC Connection Establishment lte-enodeb-s1-startup-sib-rrc-connection. After RRC is established, network attached storage (NAS) signaling begins. The main difference is that the UE is moved to the target RAT whilst in RRC Connected Mode, also MME can get some response(UE Context Required) from GSM so as to. 1 Introduction. >>At the expiry performs the actions. 0 - LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification (3GPP TS 36. 4 UE Triggers RRC Connection Re-establishment to Another Cell in Same eNodeB 96 6. Get this from a library! Radio protocols for LTE and LTE-advanced. Random Access Procedure: The UE uses a slotted aloha procedure to access the eNodeB. X2-based Handover Procedure in 4G LTE. ETSI 3GPP TS 36. Reduced Latency: Since there is no RNC or NBAP protocol in LTE, this reduces the latency of the RRC connection establishment and RB management procedure. 1) You mentioned in one of your comments dated 26th August 2013 that "Once the RRC Connection Re-establishment procedure is triggered, the UE shall start the timer T311, and once the UE selects a suitable cell, this T311 timer is stopped, and RRC initiates the transmission of RRC Connection Re-establishment message and start the timer T301. 0 (2012-09) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Radio Resource Control (RRC);. 2 History of Mobile Telecommunication Systems 6 1. LTE KPI Optimization Deep Dive: RRC Success Rate This is the first part in LTE KPI Optimization and more related articles will be published soon. The MME has to forward S1AP paging message to all eNodeB within the relevant tracking area. LTE Cell Camping and Selection Procedure. Also, it helps to re-establish the SRB1 operation and re-activate the Security algorithms (the security algorithms doesn't change) RRC connection을 유지하기 위해선 RRE가 필요함. RRC layer specification is defined in TS 36. RRC Connection Reestablishment Success Rate: The re-establishment procedure is required in order to re-establish the lost RRC connection. RRC Connection Request 4. figure : Basic EPS entities and interfaces The LTE network was then introduced as a flat architecture, with user plane direct tunneling. (RRC Connection, , S1 Initial Establish SR, (HO SR, Intra & Inter E Node B, Inter X2 Handover SR, Inter S1 out Success Rate) • 5G sites Testing & Analysis for Hajj Project 2019, achieved 5G DL throughput criteria of 1 GBPS. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. E-UTRAN completes RRC connection establishment prior to completing the establishment of the S1 connection, i. RRC Procedures in LTE Comments v1 - Free download as PDF File (. • Fixed various issues with respect to RRC by performing unit testing. Superior end-user experience: Optimized signaling for connection establishment and other air interface and mobility management procedures have further improved the user experience. E-UTRAN initiates the RRC connection release procedure to an UE in RRC_CONNECTED state The RRC CONNECTION RELEASE procedure with redirection information can also be used for CS-fallback to GERAN or UTRAN. The signalling connection is made up of an RRC connection (UE - eNB) and an S1_MME (eNB - MME) connection. S1 Based Handover in 4G LTE. • DL data arrival during RRC_CONNECTED requiring random access procedure; • UL data arrival during RRC_CONNECTED requiring random access procedure; E. If RACH is triggered due to CCCH data, msg3 will be either RRC connection request or RRC connection re-establishment request. txt) or read online for free. The UE sends a preamble on a random access channel, the network replies with corrected timing and resource assignments. Attach, Service Request, Tracking area update etc. The SRB will be used for the. 3) RRC Connection Establishment: An RRC connection is established between the RRC layers of UE and eNB. The procedure is also used to transfer the initial NAS. UE first attempts to select the most recent cell it has camped on in connected mode, or it selects a Suitable Cell on a frequency that is allocated through the RRC Connection Release message. 3 Radio Resource Control (RRC) 47 3. In order to properly. A base station apparatus (130, 220) in a network (410) transmits V2X support information indicating that a V2X service is supported by the network (410). establishment procedure. Responsible for scoping new requirements, implementing, unit testing and debugging idle mode procedures such as SIB, Cell selection and reselection, Connection establishment and release, inter-RAT. The procedure for ECM connection establishment begins when the UE accesses a cell through the radio access channel, and then sends an RRC Connection Request message to establish an RRC connection. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. It contains a routing parameter which can be used to route the establishment of a signalling connection to a Core Network (CN) node within a CN domain. Receive an RRCConnectionSetupComplete message from a UE during an RRC connection establishment proced Definition: lte-rrc-sap. RRC connection establishment is 3 way handshake procedure comprising of following messages. RRC Connection Reestablishment Success Rate: The re-establishment procedure is required in order to re-establish the lost RRC connection. Reception of RRCConnectionReject while performing RRC connection establishment. LTE Rrc Connection Attach Procedure. The QCI is a scalar that is used within the access network (namely the eNodeB) as a reference to node specific parameters that. UE Paging Procedure. 1 From 1G to 3G 6. RRC connection establishment is used to make the transition from RRC Idle mode to RRC Connected mode. The procedure of RRC connection between UE and eNB is as follows. 4 How to not break LTE crypto 1. The Service Drop Rate (All) KPI indicates the call drop rate of all the services in a cell or radio network, including the VoIP service. Also to perform handovers. Section 8: 4G LTE Evolved Packet Core Procedure. docx), PDF File (. RRC connection procedures is used to establish an RRC layer connection between the UE and UTRAN. UE can start connection establishment procedure if the user starts the application for internet or email. For a UE in this state, there exists a signalling connection between the UE and the MME. releases by the eNB per cell due that the contact with the UE is lost with the pre-condition that the Initial Context Establishment procedure must first have been successfully completed and that there was data in either the UL or DL buffer. 1 Network Selection 187. RRC Conn Request. The connection re-establishment succeeds only if the concerned cell is prepared i. The procedure names are still pretty much the same, one still does RRC connection establishments, RRC re-configurations, authentication, ciphering, bearer establishments, etc. How LTE RRC (4G) and NR RRC (5G) Protocols are used in Parallel in EN-DC (5G NSA) Last week I had a fruitful discussion with a fellow blogger on the web, Martin Sauter (@mobilesociety) regarding a post in which he compared features of LTE RRC (3GPP 36. The connection establishment and release procedure initiated by UE on the Uu and S1 interfaces is shown in Figure 2. E-UTRAN initiates the RRC connection release procedure to an UE in RRC_CONNECTED state The RRC CONNECTION RELEASE procedure with redirection information can also be used for CS-fallback to GERAN or UTRAN. Provided is a method for configuring a release cause by a user equipment (UE) in a wireless communication system. API design completed ( header files for system information , Paging and other call control procedure example : RRC Connection establishment , RRC connection release , RRC connection re establishment etc. According to the 3GPP TS 36. 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. E-UTRAN always initiates this procedure prior to the establishment of Signalling Radio Bearer2 (SRB2) and Data Radio Bearers (DRBs). Others / 49. Cell search performed. - compiled successfully 2. 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. - will validate a set of necessary conditions. For a UE in this state, there exists a signalling connection between the UE and the MME. (RRC Connection, , S1 Initial Establish SR, (HO SR, Intra & Inter E Node B, Inter X2 Handover SR, Inter S1 out Success Rate) • 5G sites Testing & Analysis for Hajj Project 2019, achieved 5G DL throughput criteria of 1 GBPS. Reference: 3GPP TS 36. 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. SIB decodi…. LTE channels and signals 2. The method may include: receiving a configuration of inactivity timer, from a base station (BS); when the data inactivity timer is expired, configuring the release cause for leaving connected state, wherein the configured release cause prevents the UE from initiating a random. The second major KPI for LTE is the LTE ERAB Success Rate which is also part of the accessibility. DL synchronization 3. pdf UE2 UE1 eNodeB MME LTE eNodeB startup and UE setup (summary) This sequence diagram describes how an eNodeB performs an S1 setup with the EPC and then initiates MIB and SIB broadcast to the UEs. When anything happens where UE need to trigger RRC Connection Re-establishment process as described above, UE sends RRC Connection Re-establishment Request with the cause of one of the followings (36. stop T310 2. At this point a. This procedure is initiated by UE when upper layers requests of a signaling connection when UE is in RRC_IDLE mode. Now whats the difference between RRC connection and RB? RRC connection is like a railway track on which RB is like carriages on the track. 2 RLF Handover Figure 2 illustrates the RLF handover procedure, also known as the RRC Connection Reestablishment procedure in the 3GPP Release 8 specifications. In the case of LTE, the initial Non-Access Stratum (NAS) message is transferred as part of the RRC connection establishment procedure. 4 RRC Connection Re-establishment The purpose of this procedure is re-establish the RRC connection, which involvedresumption of SRB1 operation and re-activation of security. 단말이 RRC_connection 상태가 되거나, Cell 이 Release가 되면 해제가 된다. 2 DRB Establishment 63 3. 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. LTE RRC, PDCP and RLC Layers RRC procedures including system info broadcasting, paging, RRC connection establishment, security establishment, NAS message transport and RRC connection reconfiguration Types of radio bearers RRC connection establishment: from RRC Idle to RRC Connected. Tyagi, Student Member, IEEE, Frank Aurzada, Ki-Dong Lee, Senior Member, IEEE,and Martin Reisslein, Fellow, IEEE Abstract—The connection establishment in Long-Term Evolu-tion Advanced (LTE-A) is often executed for distributed user. E-UTRAN always initiates this procedure prior to the establishment of Signalling Radio Bearer2 (SRB2) and Data Radio Bearers (DRBs). UL-SCH: RRC Connection Request (C-RNTI, M-TMSI, Establishment Cause) UL-SCH: RRC Connection Complete (PLMN id, Dedicated NAS Info) 2 DL-SCH: Random Access Response (RA-RNTI, C-RNTI, Timing) UE initiates a session to the eNodeB using a random RA-RNTI eNodeB assigns a C-RNTI and adjusts timing UE requests an RRC connection via the UL-SCH. 4 Attach Procedure 191. 3 UE Radio Link Failure Triggers RRC Connection Re-establishment 95 6. E-UTRAN always initiates this procedure prior to the establishment of Signalling Radio Bearer2 (SRB2) and Data Radio Bearers (DRBs). stop T310 2. 27 at RRC layer. A re-establishment is initiated upon detecting radio link failure, handover failure, mobility failure, integrity check failure and when. 2 Closed Subscriber Group Selection 187. This could be used to allow the delivery of an incoming SMS or notification of an incoming voice call RRC connection establishment for LTE is relatively simple compared to UMTS. Once the RRC connection is established, the UE requests the network to establish NAS Signaling connection, radio connection and S1 bearers by sending Service Request towards the MME. 331 NR Radio Resource Control (RRC) 24. Section 8: 4G LTE Evolved Packet Core Procedure. - Contention Resolution is based upon the reception of Contention Resolution Identity MAC CE.