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LTE RRC Connection Setup Message Sequence Chart
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LTE RRC Connection Setup Message Sequence Chart
1.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems LTE RRC Connection Setup Messaging © 2012 EventHelix.com Inc. All Rights Reserved
2.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems LTE attach message sequence chart © 2012 EventHelix.com Inc. UE eNodeB RACH: Random Access Preamble (RA-RNTI) DL-SCH: RRC Connection Setup (SRBs, DRBs, UE Specific Configuration) 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. Network establishes the SRBs and DRBs based on the establishment cause. UE acknowledges the setup of SRBs and DRBs.
3.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems RACH: UE eNodeB: Random Access Preamble RandomAccessPreamble Cyclic Prefix Sequence UE ID/RNTI Type RA-RNTI UE ID/RNTI Value • The terminal picks a preamble to send the random access message • The preambles in LTE are defined from a Zadoff-Chu sequence • The preamble consists of the cyclic prefix and a sequence • The sequence identifies the UE that is initiating the random access • The type of the UE and the UE ID value are included in the message • RA-RNTI is used as a temporary identifier during the random access procedure © 2012 EventHelix.com Inc. 3
4.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems DL-SCH: UE eNodeB: Random Access Response RandomAccessResponse UE ID/RNTI Type RA-RNTI RA-RNTI Value Timing Advance Value Uplink Grant Resources Temporary C-RNTI • The eNodeB responds with a Random Access Response on the DL-SCH channel • The UE is addressed with the RA- RNTI that was sent in the Random Access Preamble • The message carries a Timing Advance that is used to adjust the UE transmitter timing • This adjustment will synchronize the UE transmitter so that the transmissions from the UE are received within the receive timing window • The message may carry an uplink resource assignment • The message also assigns a C-RNTI that will be used to address the UE © 2012 EventHelix.com Inc. 4
5.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems UL-SCH: UE eNodeB RRC Connection Request RRCConnectionRequest UE ID/RNTI Type C-RNTI UE ID/RNTI Value UE-Identity S-TMSI MMEC M-TMSI Establishment Cause mo-Signalling • The UE has received the Random Access Response based on the RA-RNTI. • The Random Access Response assigns a C-RNTI and resources for transmission of the RRC Connection Request • The message identifies the UE with the C- RNTI • The message contains the UE-Identity • IMSI is sent in the message if this is the first attach to the network • If the terminal had attached previously, the S-TMSI is included in the message • The message also contains the establishment cause. • In this example, the RRC Connection Request is sent with “Mobile Originated Signaling” cause. • Note that the eNodeB may optionally send a contention resolution message on receipt of this message © 2012 EventHelix.com Inc. 5 EstablishmentCause emergency highPriorityAccess mt-Access mo-Signalling mo-Data
6.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems DL-SCH: UE eNodeB RRC Connection Setup RRCConnectionSetup UE ID/RNTIType C-RNTI UE ID/RNTIValue Radio Resource Config Dedicated SRBs to Add/Modify SRB Identity UL AM RLC T Poll Retransmit Poll PDU Maximum Retrans. Threshold DL AM RLC T Reordering UL-SCH Config MAX HARQ TX Periodic BSR Timer Retransmission BSR Timer PHR Config Periodic PHR Timer Prohibit PHR Timer DL Path Loss Change Uplink Power Control Dedicated P0 UE PUSCH Delta MCS Enabled P0 UE PUCCH PSRS Offset Filter Coefficient • The message identifies the signaling radio bearer (SRB) • The configuration parameters carried in the message are described in the next two slides © 2012 EventHelix.com Inc. 6
7.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems RRC Connection Setup Configuration - 1 RLC Uplink Configuration • Timer for status report polling • Number of retransmissions of buffer status report • Control plane retransmission limit RLC Downlink Configuration • The maximum time to wait for packet reordering UL-SCH configuration • Maximum number of Hybrid ARQ transmissions • Periodic and regular buffer status report (BSR) timer © 2012 EventHelix.com Inc. 7
8.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems RRC Connection Setup Configuration - 2 Power Headroom Report (PHR) Configuration • Periodicity of the PHR • Downlink Path Loss more than the specified value also triggers PHR (provided the Prohibit PHR timer has expired) Uplink Power Control Parameters • P0-UE-PUSCH and P0-UE-PCCH values are used to determine the nominal power of the uplink transmissions • “pSRS Offset” determines the uplink Sounding Reference Signal power • Delta MCS (choose between Ks = 0 and Ks = 1.25) • Filter Coefficient value for RSRP (Reference Signal Received Power) measurement used to calculate path loss • Reference: 36.213 clause 5.1.1.1 © 2012 EventHelix.com Inc. 8
9.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems UL-SCH: UE eNodeB RRC Connection Setup Complete RRCConnectionSetup Complete Selected PLMN Identity Registered MME (Optional) PLMN Id MMEGI MMEC Dedicated Info NAS Octets carrying NAS message • UE sends this message on receipt of the RRC Connection Setup message • “Dedicated Info NAS” is used to transfer UE specific NAS layer information between the network and the UE. The RRC layer is transparent for this information. • The message may optionally contain registered MME • The RRC Connection Setup Complete may also carry octets for a NAS message exchanged between the UE and the MME © 2012 EventHelix.com Inc. 9
10.
EventHelix.com • telecommunication design •
systems engineering • real-time and embedded systems Explore more Links Description 3GPP 36.331 RRC Specifications Radio Resource Control (RRC); Protocol specification EventStudio System Designer Sequence diagram based systems engineering tool. VisualEther Protocol Analyzer Wireshark based visual protocol analysis and system design reverse engineering tool. Telecom Call Flows GSM, SIP, H.323, ISUP, LTE and IMS call flows. TCP/IP Sequence Diagrams TCP/IP explained with sequence diagrams. Telecom • Networking • Software Real-time and embedded systems, call flows and object oriented design articles. Telecom • Networking • Design blog EventHelix.com blog © 2012 EventHelix.com Inc. 10
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