3G Call Flow
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Transcript of 3G Call Flow
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3G Call Flow
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RRC Connection Set up
RAB Set up
Radio Link Reconfiguration
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UE RNCNodeB CNRRC: RRC Connection Request (CCCH)
NBAP: Radio Link Setup Request
NBAP: Radio Link Setup Response
L1 Synchronization
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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.
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RRC Connection Request UL
Start T300=400…8000ms
N300=0 to 7
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CCCH : Common control channel :
bidirectional channel for transmitting the
control information Btw N/W and UE.
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Slide 4
YG(-I1 Yadav, Gautam (NSN - IN/Noida), 3/11/2011
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UE RNCNodeB CNRRC: RRC Connection Request (CCCH)
NBAP: Radio Link Setup Request
NBAP: Radio Link Setup Response
Cell ID, Frequency and SC
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RRC: RRC Connection Setup (FACH)
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.
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RRC CONNECTION SET UP
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A long UTRAN UE Identity is required
(U-RNTI, which includes SRNC Address) so
that the uplink message can be routed to
the Correct serving RNC.
RNTI: Radio N/W Temporary Identifier
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UE RNCNodeB CNRRC: RRC Connection Request (CCCH)
NBAP: Radio Link Setup Request
NBAP: Radio Link Setup Response
RRC: RRC Connection Setup (FACH)
L1 Synchronization
NBAP: Synchronization IndicationT312= 1 to 15 N312 = 1 …..1000
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RRC: RRC Connection Setup Complete (DCH)
RRC: RRC Connection Setup Complete (DCCH)
RRC Connection Setup complete will be sent on DCH. Ciphering related parameters and UE capability information will be sent back to SRNC.
L1 Synchronization
UE and Node are synchronized and DCH is allocated after L1 Synchronization.
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RRC CONNECTION SET UP COMPLETE
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This indicates wheather the message belongs to the
same signaling Procedure as the preceding setup
message.
The value Flag (0) indicates the transaction is initiated
by UE and this message is also from UE to RNC.
Supported Physical and transport channels
Frequency band
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RRC: Initial Direct Transfer (MM: CM Service Request)SCCP: CR (Connection Request)
RANAP: Initial UE Message (MM: CM Service Request)
SCCP: CC (Connection Confirm)
RANAP: Direct Transfer (MM: Authentication Request)
RRC: Downlink Direct Transfer (MM: Authentication Request)
RRC: Uplink Direct Transfer (MM: Authentication Response)
RRC Connection Establishment – CELL DCH State
UE RNCNodeB CN
RRC: Initial Direct Transfer [CM Service Request]
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RRC: Initial Direct Transfer [CM Service Request]
First NAS message is now sent by the UE. It indicates that a UE originated Voice call is required. The UE identity (TMSI) will also be passed in this message.
RRC: Downlink Direct Transfer [Authentication Request]
SRNC transfers the NAS message to the UE
RRC: Uplink Direct Transfer [Authentication Response]
UE computes the response (RES) and sends it back in the NAS message
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MM CM SERVICE REQUEST
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RRC: Initial Direct Transfer (MM: CM Service Request)SCCP: CR (Connection Request)
RANAP: Initial UE Message (MM: CM Service Request)
SCCP: CC (Connection Confirm)
RANAP: Direct Transfer (MM: Authentication Request)
RRC: Downlink Direct Transfer (MM: Authentication Request)
RRC: Uplink Direct Transfer (MM: Authentication Response)
RRC Connection Establishment – CELL DCH State
UE RNCNodeB CN
RANAP: Direct Transfer (MM: Authentication Response)
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RANAP: Security Mode Command
RRC: Security Mode Command
RRC: Security Mode Command
RRC Forwards the Security Mode command received from MSC/VLR to the UE.
RRC: Security Mode Complete
RRC: Security Mode Complete
RANAP: Security Mode Complete
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SECURITY MODE COMMMAND
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SECURITY MODE COMMMAND COMPLETE
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UE RNCNodeB CN
RRC: Uplink Direct Transfer (CC: Setup)
RANAP: Direct Transfer (CC: Setup)
RANAP: Direct Transfer (CC: Call Proceeding)RRC: Downlink Direct Transfer (CC: Call Proceeding)
RRC: UL Direct Transfer [Setup]
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The UE now sends the 'Setup' message in UL Direct Transfer message. This will include all the required parameters for setting up the voice call. It will include the number that UE wishes to be contacted and the bearer capability
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CC SET UP
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MEASUREMENT REPORT
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ACTIVE CELL UPDATE AND COMPLETE
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RANAP: RAB Assignment RequestNBAP: Radio Link Reconfiguration Prepare
NBAP: Radio Link Reconfiguration Ready
NBAP: Radio Link Reconfiguration Commit)
< 1s
UE RNCNodeB CN
Different types of user data
Transferred on Iu Interface and
QOS for that.
(AC)
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NBAP: Radio Link Reconfiguration Commit)
RRC: Radio Bearer Setup
RRC: Radio Bearer Setup Complete
RANAP: RAB Assignment Response
Timer wf_rb_setup_cpl (6s) is started when the RRC: Radio Bearer Setup message is sent to the UE In ca se the timer expires Iu Release Request is sent to the CN with release cause (radio_conn_lost)
wf_rb_setup_cpl (6s)radio_conn_lost
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RADIO BEARER SET UP
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Call Established
RANAP: Direct Transfer (CC: Connect)RRC: Downlink Direct Transfer (CC: Connect)
RRC: Uplink Direct Transfer (CC: Connect Acknowledge)
RANAP: Direct Transfer (CC: Connect Acknowledge)
RRC: Uplink Direct Transfer (CC: Disconnect)
RANAP: Direct Transfer (CC: Disconnect)
RANAP: Location ReportRRC: Measurement Control
Call Disconnect
RANAP: Direct Transfer (CC: Alerting)RRC: Downlink Direct Transfer (CC: Alerting)
UE RNCNodeB CN
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RANAP: Direct Transfer (CC: Release Complete)
RANAP: Iu Release Command
RANAP: Direct Transfer (CC: Disconnect)
RANAP: Direct Transfer (CC: Release)
RRC: Downlink Direct Transfer (CC: Release)
RANAP: Iu Release CompleteRRC: Downlink Direct Transfer (CC: RRC Connection Release)
RRC: Uplink Direct Transfer (CC: Release Complete)
NBAP: Radio Link Deletion Request
NBAP: Radio Link Deletion Response
ALCAP: ERQ (Establish Request)
ALCAP: ECF (Establish Confirm)
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RRC State Transitions
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Transition from CELL_DCH to CELL_FACH
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Transition from CELL_FACH to CELL_DCH
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Transition from CELL_FACH to CELL_DCH
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Transition from CELL_DCH to CELL/URA_PCH
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Transition from CELL/URA_PCH to CELL_DCH
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Summary
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Signalling connection setup
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Signalling connection release
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Signalling connection release requested by the CN .
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Signalling connection release
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Signalling connection release requested by the UE .
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Paging the UE in idle mode
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The RNC checks whether the paged UE is engaged in an ongoing radio resourcecontrol (RRC) connection. If there is no connection, the RNC starts the idle modepaging procedure.
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Paging the UE in Connected mode
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Connected mode (CELL_FACH or CELL_DCH)
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RNC-originated paging
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1. Cell update
Location updates
The UE message contains the cell update cause, which can be:
1. cell reselection2. periodic cell update3. uplink data transmission
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3. uplink data transmission4. paging response5. re-entering service area6. radio link failure.
If the cell update was caused by cell reselection, the RNC updates the UE location information and resets the CELL_FACH or CELL_PCH state supervision timer.The RNC's confirmation message to the UE includes a radio network temporary identifier for the cell (C-RNTI) if the UE remains in CELL_FACH state.
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2. URA update
When the UE is in URA_PCH state and has switched to a new URA, it sends anupdate message with the U-RNTI (radio network temporary identifier) and URAupdate cause to the RNC. The cause is either URA reselection or periodic URAupdate.
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Periodic URA update
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THANKS
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