3G Call Flow

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3G Call Flow

1 © Nokia Siemens Networks 2011

For internal useUnique document identifier (ID) / Version number / Life cycle status

Dept. / Author / Date

RRC Connection Set up

RAB Set up

Radio Link Reconfiguration




UE RNCNodeB CNRRC: RRC Connection Request (CCCH)

NBAP: Radio Link Setup Request

NBAP: Radio Link Setup Response

L1 Synchronization




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.

RRC Connection Request UL

Start T300=400…8000ms

N300=0 to 7




CCCH : Common control channel :

bidirectional channel for transmitting the

control information Btw N/W and UE.

Slide 4

YG(-I1 Yadav, Gautam (NSN - IN/Noida), 3/11/2011




Cell ID, Frequency and SC




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.

RRC CONNECTION SET UP



Dept. / Author / DateState Indicator and RNTI

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




RRC: RRC Connection Setup (FACH)

L1 Synchronization

NBAP: Synchronization IndicationT312= 1 to 15 N312 = 1 …..1000




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.

RRC CONNECTION SET UP COMPLETE




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

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]




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

MM CM SERVICE REQUEST




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)




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

SECURITY MODE COMMMAND




SECURITY MODE COMMMAND COMPLETE




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]




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

CC SET UP




MEASUREMENT REPORT




ACTIVE CELL UPDATE AND COMPLETE




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)




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

RADIO BEARER SET UP




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




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)

RRC State Transitions




Transition from CELL_DCH to CELL_FACH




Transition from CELL_FACH to CELL_DCH




Transition from CELL_FACH to CELL_DCH




Transition from CELL_DCH to CELL/URA_PCH




Transition from CELL/URA_PCH to CELL_DCH




Summary




Signalling connection setup




Signalling connection release




Signalling connection release requested by the CN .

Signalling connection release




Signalling connection release requested by the UE .

Paging the UE in idle mode




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.

Paging the UE in Connected mode




Connected mode (CELL_FACH or CELL_DCH)

RNC-originated paging




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




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.

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.




Periodic URA update

THANKS




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3G Call Flow