Call Flow CS1

7/27/2019 Call Flow CS1

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UE RNCNodeB MGW/CNRRC: RRC Connection Request (RACH)

NBAP: Radio Link Setup Request

NBAP: Radio Link Setup Response

ALCAP: ERQ (Establish Request)

ALCAP: ECF (Establish Confirm)

RRC: RRC Connection Setup (FACH) [RRCconnRepTimer1/2(100ms,1s)]

L1 Synchronization

NBAP: Synchronization Indication

RRC: RRC Connection Setup Complete (DCH)

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)

RANAP: Direct Transfer (MM: Authentication Response)

RANAP: Common ID

RANAP: Security Mode Command

RRC: Security Mode Command

FP: Downlink Synch

FP: Uplink Synch

RRC Connection Establishment CELL DCH State

RNC checks if resources areavailable: BTS, AC,

Transmission.If not it sends RRC ConnectionReject

T300=2s ; N300=3

L1 Synchronization

T312=6s ; N312=4

MOS CS Message Flow


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UE RNCNodeB MGW/CN

RRC: Security Mode Complete

RANAP: Security Mode Complete

RRC: Uplink Direct Transfer (CC: Setup)

RANAP: Direct Transfer (CC: Setup)

RANAP: Direct Transfer (CC: Call Proceeding)RRC: Downlink Direct Transfer (CC: Call Proceeding)

RANAP: RAB Assignment Request

NBAP: Radio Link Reconfiguration Prepare

NBAP: Radio Link Reconfiguration Ready



NBAP: Radio Link Reconfiguration Commit)

RRC: Radio Bearer Setup

RRC: Radio Bearer Setup Complete

RANAP: RAB Assignment Response



RAB Establishment

FP: Downlink Synch

FP: Uplink Synch

RL modification procedure:

SRB+DCH, HW resources checked

Possible failure in AAL2

setup (Iub, Iur and Iu)

Soft handover is not allowed during the RAB establishment procedure (The mobile can not add or remove cells in

AS) this makes the UE and Node B particularly sensitive to mobility and dominance Timer wf_rb_setup_cpl (6s) is

started when the RRC: Radio Bearer Setup message is sent to the UE In case the timer expires Iu Release Request is

sent to the CN with release cause (radio_conn_lost)


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Call Established

UE RNCNodeB

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: Release Complete)

RANAP: Direct Transfer (CC: Release Complete)

RANAP: Iu Release Command

RRC: Uplink Direct Transfer (CC: Disconnect)

RANAP: Direct Transfer (CC: Disconnect)

RANAP: Direct Transfer (CC: Release)

RRC: Downlink Direct Transfer (CC: Release)

RANAP: Iu Release Complete

MGW/CN

RANAP: Location ReportRRC: Measurement Control

Call Disconnect

RRC: Downlink Direct Transfer (CC: RRC Connection Release)



NBAP: Radio Link Deletion Request

NBAP: Radio Link Deletion Response



RANAP: Direct Transfer (CC: Alerting)

RRC: Downlink Direct Transfer (CC: Alerting)


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UE RNCNodeB MGW/CN

RRC: RRC Connection Request (RACH)

NBAP: Radio Link Setup Request

NBAP: Radio Link Setup Response



RRC: RRC Connection Setup (FACH)

L1 Synchronization

NBAP: Synchronization Indication

RRC: RRC Connection Setup Complete (DCH)

RRC: Initial Direct Transfer (MM: Paging Response)

SCCP: CR (Connection Request)

RANAP: Initial UE Message (MM: Paging Response)

SCCP: CC (Connection Confirm)

RANAP: Direct Transfer (MM: Authentication Request)

RRC: Downlink Direct Transfer (MM: Authentication Request)

RRC: Uplink Direct Transfer (MM: Authentication Response)

RANAP: Direct Transfer (MM: Authentication Response)

RANAP: Common ID

RANAP: Security Mode CommandRRC: Security Mode Command

FP: Downlink Synch

FP: Uplink Synch

RRC Connection Establishment CELL DCH State

L1 Synchronization

MTC CS Message FlowRANAP: Paging

RRC: Paging Type 1


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UE RNCNodeB MGW/CN

RRC: Security Mode Complete

RANAP: Security Mode Complete

RRC: Uplink Direct Transfer (CC: Setup)RANAP: Direct Transfer (CC: Setup)

RANAP: Direct Transfer (CC: Call Confirmed)RRC: Downlink Direct Transfer (CC: Call Confirmed)

RANAP: RAB Assignment Request

NBAP: Radio Link Reconfiguration Prepare

NBAP: Radio Link Reconfiguration Ready



NBAP: Radio Link Reconfiguration Commit)

RRC: Radio Bearer Setup

RRC: Radio Bearer Setup Complete

RANAP: RAB Assignment Response



RAB Establishment

FP: Downlink Synch

FP: Uplink Synch

RL modification procedure:

SRB+DCH, HW resources checked

Possible failure in AAL2

setup (Iub, Iur and Iu)

Soft handover is not allowed during the RAB establishment procedure (The mobile can not add or remove cells in

AS) this makes the UE and Node B particularly sensitive to mobility and dominance Timer wf_rb_setup_cpl (6s) is

started when the RRC: Radio Bearer Setup message is sent to the UE In case the timer expires Iu Release Request is

sent to the CN with release cause (radio_conn_lost)


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Call Established

UE RNCNodeB

RANAP: Direct Transfer (CC: Connect)RRC: Downlink Direct Transfer (CC: Connect)

RRC: Uplink Direct Transfer (CC: Connect Acknowledge)

RANAP: Direct Transfer (CC: Connect Acknowledge)

MGW/CN

RANAP: Location ReportRRC: Measurement Control

RANAP: Direct Transfer (CC: Alerting)RRC: Downlink Direct Transfer (CC: Alerting)


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MOC

M

T

C

MOC/MTC Call Flow timing


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RRC messages information

Voice and Video are both

Conversational Call


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DL SRB


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UE in DUAL MODE


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Voice AMR


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CS call, 64Kbps,

Transparent

Video Call


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Video CS 64:

DL SF 32

UL SF 16

Voice AMR:

DL SF 128

UL SF 64


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75. Briefly describe the UE to UTRAN

protocol stack (air interface layers).

The radio interface is divided into 3 layers:

1. Physical layer (Layer 1, L1): used

to transmit data over the air, responsible

for channel coding, interleaving, repetition,modulation, power control, macro-diversity

combining.

2. Link layer (L2): is split into 2 sub-

layers - Medium Access Control (MAC) and

Radio Link Control (RLC).

" MAC: responsible for multiplexingdata from multiple applications onto

physical channels in preparation for over-

the-air transmition.

" RLC: segments the data streams

into frames that are small enough to be

transmitted over the radio link.3. Upper layer (L3): vertically

partitioned into 2 planes: control plane for

signaling and user plan for bearer traffic.

" RRC (Radio Resource Control) is

the control plan protocol: controls the radio

resources for the access network.


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Call Flow CS1

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