The UE signals the setup of the RRC connection. UL-SCH, C-RNTI, UE-Identity = S-TMSI, Establishment Cause = mo-Signalling RRC Connection Setup DL-SCH,C-RNTI, SRB Identity,DL AM RLC,UL AM RLC,UL-SCH Config,PHR Config,Uplink Power Control The message also contains configuration parameters for uplink RLC, UL-SCH, Power Head Room (PHR) and Uplink Power Control.Ħ eNodeB RRC Signal flow UE RRC Connection Request The message creates the signaling radio bearer (SRB) in Acknowledge The dged mode. eNodeB responds with an RRC Connection Setup message on the DL-SCH.

The message also includes the establishment cause for the RRC connection. The message contains a UE identity (typically S-TMSI: MMEC+M-TMSI). The UE is identified by the C-RNTI that was assigned in the Random Access Response message. UE uses a UL-SCH allocation to send the RRC Connection Request message. UE eNodeB Random Access Preamble (RACH,Preamble,RA-RNT) Random Access Response (DL-SCH,RA-RNTI,Timing Advance,Uplink Resource Grant,Temporary C-RNTI ) Randomly select a preamble for sending a RACH

Optionally, the message may assign resources to the terminal for uplink transmission. The message also sends a timing adjustment to correct the uplink timing from the UE. The message addresses the UE with a RA-RNTI but the message also assigns a Temporary C-RNTI. The message identifies the UE with RA-RNTI The eNodeB responds to the preamble with the 'Random Access Response' message on the DL-SCH. The terminal initiates a new session with the randomly selected preamble. The preambles are generated from Zadoff-Chu sequences. UE picks one of the 64 RACH preambles available in an LTE cell. User data sessions is exchanged once the default bearer is setup. Default bearer session is established at the UE, eNodeB, MME, Serving GW and PDN Gateway. Default Bearer Setup: Finally, the default bearer for data transfer is established. This phase also involves authentication for the UE as well are the Network. MME and Serving Gateway also establish a context for the UE. Attach and Authentication: The UE now attaches to the Core Network. This is follwed up with RRC connection establishment signaling on the UL-SCH and DL-SCH.

This procedure is initiated with a random access with a preamble. The connection establishment progresses through the following phases: RRC Connection Establishment: The Radio Resource Control layer establishes a connection between the UE and the eNodeB. 1 LTE Call Flow and MS Attached ProceduresĢ Overview This flow describes the setup of an LTE session.

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