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Thread: 3G/UMTS Complete Mobile Originated Circuit Switched Call Setup

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    Default 3G/UMTS Complete Mobile Originated Circuit Switched Call Setup

    <h3>A Complete Mobile Originated Circuit Switched Call Setup is shown in the MSC below. </h3><table>
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    1. System Information (BCCH)
    The UE reads the System Information that is
    broadcast on BCCH. The information is not read continuously. It is only
    read if the information changes
    <br>

    2. RRC: RRC Connection Request (CCCH)
    The Mobile user decides to initiate a voice
    call. The first message the UE will send on CCCH is RRC Connection
    Request. This will contain among other things, Initial UE Identity and
    Establishment Cause
    <br>

    3. NBAP: Radio Link Setup Request
    The SRNC sends this message to Node B. It will pass the Cell Id, TFS, TFCS, frequency, UL Scrambling code, etc to Node B.<br>

    4. NBAP: Radio Link Setup Response
    Node B allocates the resources and starts PHY
    Reception. While transmitting the response it includes the Transport
    layer addressing information that includes the Binding Identity of the
    AAL2 for Iub data transport bearer<br>

    5. ALCAP: Establish REQ
    The AAL2 binding identity (Iub Data Transport
    Bearer Id) is passed to ALCAP protocol in Node B. The Iub Data
    Transport bearer is now bounf to DCH. <br>

    6. ALCAP: Establish CNF
    Establish confirm from ALCAP in Node B<br>

    7: DCH-FP: Downlink Synchronisation
    The Node B and SRNC establishes synchronisation
    for the Iub Data Transport bearer by means of exchange of the
    appropriate DCH Frame Protocol frames.<br>

    8: DCH-FP: Uplink Synchronisation
    Once the UL synchronisation is acheived, Node B starts DL transmission.<br>

    9: RRC: RRC Connection Setup (CCCH)
    RRC Connection Setup message is sent on CCCH
    with the parameters required to establish DCH. Also the state indicator
    will be set to DCH for the voice (or CS) call.<br>

    10: NBAP: Radio Link Restore Indication
    Once the UE establishes Radio Link, Node B will send RL Restore indication to the SRNC.<br>

    11: RRC: RRC Connection Setup Complete (DCCH)
    RRC Connection Setup complete will be sent on
    DCCH. Integrity and Ciphering related paarmeters and UE capability
    information will be sent back to SRNC<br>

    12: RRC: Initial Direct Transfer [CM Service Request]
    First NAS message is now sent by the UE. It
    indicates that a UE orginated Voice call is required. The UE identity
    (TMSI) will also be passed in this message<br>

    13: RANAP: Initial UE Message [CM Service Request]
    The NAS message will be forwarded to appropriate
    CN Domain (CS Domain in this case). Along with the CM service request,
    it will also include LAI and SAI.<br>

    14: RANAP: Direct Transfer [Authentication Request]
    MSC/VLR needs to perform authentication to make
    sure that the UE is genuine. For this reason it will challenge the UE
    with a Authentication token and RAND (random number)<br>

    15: RRC: Downlink Direct Transfer [Authentication Request]
    SRNC transfers the NAS message to the UE<br>

    16: RRC: Uplink Direct Transfer [Authentication Response]
    UE computes the response (RES) and sends it back in the NAS message<br>

    17: RANAP: Direct Transfer [Authentication Response]
    SRNC relays the response to the MSC/VLR. The
    MSC/VLR will compare the response RES with the expected response XRES.
    If they are the same then the procedure will continue.<br>

    18: RANAP: Security Mode Command
    MSC/VLR sends the Security Mode Command to start
    Ciphering and Integrity Protection. Ciphering is optional while
    Integrity Protection is mandatory. The Algorithms, etc are known to the
    MSC/VLR and the UE and only the ones that are common between them are
    used.<br>

    19: RRC: Security Mode Command
    RRC Forwards the Security Mode command received from MSC/VLR to the UE.<br>

    20: RRC: Security Mode Complete
    The UE configures the Ciphering and Integity
    Protection and responds back to the network. The response message is
    Integrity Protected for further safety. Ciphering is started at
    Ciphering activation time. Since this is a Circuit switched call, the
    Ciphering will be started in MAC. In case of AM and UM bearers it is
    started in RLC.<br>

    21: RANAP: Security Mode COmplete
    The network forwards the Security Mode Complete message to MSC/VLR.<br>

    22: RANAP: Direct Transfer [TMSI Reallocation Command]
    The network may decide to re-allocate the TMSI
    to the UE. It sends a DT message which includes the NAS TMSI
    Reallocation Command.<br>

    23: RRC: DL Direct Transfer [TMSI Reallocation Command]
    The RNC relays the DT message to the UE.<br>

    24: RRC: UL Direct TRansfer [TMSI Reallocation Complete]
    The UE takes the new TMSI and responds with the Complete message<br>

    25: RANAP: Direct Transfer [TMSI Reallocation Complete]
    The RNC relays the message to the CN domain<br>

    <br>

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