Call Flow

A comparison between the call flow in GSM and UMTS

Handover/Clear

Call to a MS

Paging

Call from a MS

ImmediateAssignment

Assignment / Change of

Mode

Supervision

on CCCH/PCH

on CCCH/AGCH

Immediate assignment of SDCCH

on SDCCH

on TCH

Assignment of TCH

on RACH

Locating

Initiations

Filtering

Urgency

Basic Ranking

Aux RadioNetwork

Function Eval(HCS)

Organizing List

Sending List

Allocation Reply

MEASUREMENTS

•Immediate Assignment on TCH•ACLC

•ASSOC•AW•CLS•DHRA

Handover•Inter cell/BSC•Intra cell/BSC•OL/UL•Bad Quality•Urgency•HCS

Chan

nel A

dm

inis

trati

on

(SDDCH Perform.)

(Random Access)

(Assignment Fail.)

(Traffic Erlangs)

(Call Quality)

(Handover Perf.)

(Dropped Calls)

(Available TCH)

(Paging Perf.)

GSM Call Flow

Soft/SofterHandover/Clear

Call to a MS

Paging

Call from a MS

RRC Connection

RABAssignment

Supervision

on PICH/SCCPCH

on FACH/ SCCPCH Predefined Signaling

RAB Selected

on FACH/SCCPCH

on DPDCH

Assignment of DPDCH

on RACH

ActivateAlgorithms

Power Ctrl.

Code Ctrl.

Admission Ctrl.

RAB Selection

MEASUREMENTS

•Directed Retry

•Load Sharing

Soft Handover•Inter cell/BSC•Intra cell/BSC•OL/UL•Bad Quality•Urgency•HCS

Inn

er

Loop/O

ute

r Lo

op

Pow

er

Con

trol

(RRC Connect. Perform.)

(Random Access)

(RAB Establish. Fail.)

(Traffic Erlangs)

(Call Quality)

(Handover Perf.)

(Dropped Calls)

(Available TCH)

(Paging Perf.)

UMTS Call Flow

Open LoopPower Control

(Throughput)

Open Loop on Access Channel