2. SAS_3G

1

1

Perfecting Wireless Communications

SAS

SAS

Presentation version 22 1.1.1


SAS 2

About this course

• Introduce the Anite SAS and explain its typical

usage

– Configure the SAS software to simulate cells

• For GSM and GPRS

• For WCDMA

– Run a real time simulation and replay it

– Develop a simulation

– Use the diagnostic mobile

– Analyse the results of a SAS simulation

2


SAS 3

Objectives reviewed

• Configure the SAS software to simulate cells

• Run a real time simulation and replay it

• Create a new playback script

• Develop a simulation

• Use the diagnostic mobile

• Transfer data using GPRS and WCDMA

• Analyse the results of a SAS simulation

4


SAS

About SAS

3


SAS 5

What SAS is for

• Repeatable simulations

– Help solve customer problems more quickly

– Reduced need for field trials

– Reduces time to perform repeated tests

– Reduces possibility of errors in repeated tests

– So lower costs and reduced time to market

• Unusual situations

– 'What-if' scenarios

– Situations not covered by test cases

– Functionality not yet supported by the live network


SAS 6

The SAS toolset

• The SAS application– Main front end for SAS hardware

• Log viewers– Viewing and analysing result files

• Diagnostic Mobile Interface– Controlling diagnostic mobile functions

• Supporting applications– Now SMS and WAP tools

• Playback Sequencer– Tool to support automation

4


SAS 7

Working with SAS

• Interactive

– Use user interface to test standard functions quickly and easily

• Scripting

– Use playback editor to create or edit test scripts and

build more complex tests

• Diagnostic mobile

– Use diagnostic mobile to record real-world data and

replay it in the SAS

• Automation

8


SAS

Configuring SAS

5


SAS 9

SAS terminology

• Cell configuration

– A cell configuration is a collection of information about a network cell

• Scenario

– A scenario is a collection of cell configurations and

other options. It could be a real world location or an

imaginary network

• Run

– A recording of a simulation


SAS 10

Scenarios and runs

6


SAS 11

Cells in scenarios

• A scenario contains a maximum of sixteen 2G and sixteen 3G cell configurations– Cells can be activated and deactivated dynamically

• Possible number of active cells depends on number of transceivers

• Agilent 8960 allows two GSM/GPRS logical channel combinations active in each unit– If they are on the same frequency

• For 3G, each UIP supports one cell– UIP = 8960 transceiver + ABP unit


SAS 12

Configuring file locations

7


SAS 13

Mobile station options


SAS 14

Ciphering

• Anite 2G SIM and 2G mobile - Anite GERAN Ki

• Anite 3G SIM and 3G mobile - Anite UTRAN Ki

• Otherwise - User Ki

– SAS Key Generation to match the mobile type

8


SAS 15

Hardware configuration

• Switch between configurations

– GSM/GPRS only, UTRA only, multi-RAT


SAS 16

Ratio of 2G and 3G transceivers

• The ratio of 3G and 2G transceivers is

set in the Hardware Configuration

9

17


SAS

Interactive UTRAN simulations


SAS 18

The big picture

RLC

Physical layer

MAC

RLCRLC

RLC

RLC RLC

RRCBMCPDCP

Data protocolsGSM MM

CC SMS SS

GPRS MM

SMS SM

AccessStratum

NonAccessStratum

Control plane User plane

RLC

CircuitSwitchedprotocols

10


SAS 19

Multi-RAT protocol stack

Layer 1 (WCDMA)

RLC RLC RLC

PDCP BMCRRC

MAC

Layer 1 (TDMA)

LAPDm (Layer 2)

Layer 3

CBSMSTCP/IP

Application

MM, GMM, CC, SMS

RLC

MAC

SNDCP

LLC

20


SAS

Configuring UTRAN cells

11


SAS 21

UTRAN cell configuration

• Set up basic cell

configuration

• Select core network

domain type

• Set CPCH

configuration

• Set UTRAN registration

area information


SAS 22

UE timers and constants

TS 25.33110.3.3.43-44

13.1-3

12


SAS 23

Cell Selection parameters

• Settings related to Cell Selection and re-selection

• Used to define the

contents of the System

Information Blocks


SAS 24

Measurement Information

13


SAS 25

Common channels

• Bear combination options

• Open loop power settings

• RACH Aloha parameters

• RACH acknowledgement

channel (AICH)


SAS 26

Mobility Information

• Selection of Cell_DCH or

Cell_FACH state

• Entry for additional

Network identities

14


SAS 27

RRC Connection options

Enable or Disable

• UEA1 Ciphering

• Integrity Protection

• RRC Connection

Rejection

The Scrambling Code for

the the DPCH can also

be set


SAS 28

CS and PS domain options

15


SAS 29

Real time trace

• SAS Real Time Trace

– Layer 3 messages only

– Message content may be viewed

– Message types may be filtered

• Anite Real Time Trace

– View of all protocol layers (NAS to Physical layer)


SAS 30

Anite Real Time Trace

• Real time trace window shows message

sequence

• Use 'freeze' option to link

to Log Viewer

16


SAS 31

UTRAN procedures

• RRC Connection Setup

• Speech calls and data services using UTRAN

radio bearer

• Handovers

– Inter-system

– Soft (active set update)

– Hard (inter-frequency)


SAS 32

UTRAN measurement window

• Shows serving cell and UTRAN neighbour cell

(N1 to N6) information, reported by the UE

17


SAS 33

Soft handover


SAS 34

Inter-system handover

• GSM to UTRAN or UTRAN to GSM

• UE measures current carrier (either Node B or

BSS) and carriers in other system

• UTRAN or GSM network forces handover based

on measurement reports

• 'Break before make' handover

18


SAS 35

UTRAN to GSM handover

UE UTRAN MSC GSM BSS

System Information

or Measurement Control

Measurement Report

Resource Reservation

Resource Reservation Acknowledge

and Handover Command

Inter-system

Handover Command

Handover Access


SAS 36

GSM to UTRAN handover

UE GSM BSS MSC UTRAN

System Information

Measurement Report

Resource Reservation

Resource Reservation Acknowledge

and Handover Command

Inter-system

Handover Command

Handover to UTRAN Complete

19


SAS 37

Radio Bearers

RB 1 RB 2 RB 3 RB 4

Signalling Radio Bearers

DCH-5

148 0

148 1

Transport

format set

Transport

Channel

Logical

Channel DCCH DCCH DCCH DCCH

RB 10 RB 12RB 11

Radio Bearers - Speech

CCTrCH

DCH-1 DCH-2 DCH-3

39 1

81 1

103 0

103 1

60 0

60 1

81 0


SAS 38

Bearer Combinations

• Selected Radio

Bearer Combination

(Full rate speech and

signalling)

• Choice of possible

Bearer Combinations(These defaults are configured on next slide ...)

20


SAS 39

Configuration of Bearer Combinations

• Configuration of

– Transport Format Combination Sets

– Physical Channel (bit rates and bits/slot)

– Radio Bearer (configured on next two slides ...)


SAS 40

Configuration of Radio Bearer (SRBs)


– RLC parameters (RLC mode and payload

size)

– Layer 1 (Transport format, coding parameters)

21


SAS 41

Configuration of Radio Bearer (RABs)


– RLC parameters

– Layer 1 (Transport format, coding parameters)


SAS 42

Bearer combinations

RLC RLC RLC RLC

MAC

PHY

SRB 1 SRB 2 SRB 3 SRB 4

DCCH DCCH DCCH DCCH

DCH

DPCH

22


SAS 43

UTRAN System Information Override


SAS 44

Scheduling of System information

Scheduling block 1

SI block 1

SI block 4

SI block 3

SI block 2

SI block 5

SI block 18

Ma

ste

r info

rma

tion

blo

ck

23


SAS 45

Scheduling Control

• Scheduling information for SIBs may be in the

MIB or Scheduling Block 1

46


SAS

UTRAN packet data transfer

24


SAS 47

The limit of SAS

Physical

RLC

MAC

LLC

Data protocol (IP)

SNDCP

Application Can be

simulated

using external

software

Upper limit

of SAS

Physical

MAC

RLC

PDCP

GS

M/G

PR

S p

art

UT

RA

N p

art


SAS 48

End to end testing again

Contro

ller P

CTCP/IP

adapter

SAS

Server application

(e.g. web server, FTP server)HTML,

files

www

25


SAS 49

Data analysis window

50


SAS

UTRAN scripting in the Playback Editor

26


SAS 51

The Playback Editor

Sessioncontrol

Main editing areaScriptcontrol


SAS 52

Timing in Playback

• SS --> MS

– delta time defines the delay before the message is sent or the MT procedure starts

• MS --> SS

– delta time defines the time for which SAS will wait for the expected message

– if the message is not received, the procedure will fail

27


SAS 53

Inserting items into scriptsLoad a scenario file

Cell control

Cell registration

Traffic channel control

Speech calls

GPRS procedures

Handovers

Messages

Script control

Single messagesReset cells


SAS 54

Inserting Layer 3 messages

28


SAS 55

Example 1 – speech call again

…

SETUP00:00:00SS → MS

RRC SECURITY MODE COMPLETE00:20:00SS ← MS

RRC SECURITY MODE COMMAND00:00:00SS → MS

AUTHENTICATION RESPONSE00:08:00SS ← MS

AUTHENTICATION REQUEST00:00:50SS → MS

PAGING RESPONSE00:10:00SS ← MS

RRC CONNECTION SETUP COMPLETE00:05:00SS ← MS

RRC CONNECTION SETUP00:00:00SS → MS

RRC CONNECTION REQUEST00:05:00SS ← MS

RRC PAGING TYPE 100:00:00SS → MS

SPEECH CALL [TI = 0] [12345] [Speech]U-Cell A00:10:00SS → MS

LOCATION UPDATEU-Cell A00:05:00SS ← MS�

ACTIVATE CELL [CPICH POWER = -60]U-Cell A00:05:00SS → MS

LOAD SCENARIO DATAU-Cell A00:00:00SS ↔ SS


SAS 56

Example 2 – checking the UE timers

SAS UE

RRC connection request

RRC connection setup complete

RRC connection request

RRC connection setup

T300

Documents

2. SAS_3G