8/12/2019 ARI_s5

1/20

5-1Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

iedor

disc

lose

dw

ithou

tperm

iss

ion

". Section 5

Data Transmission

8/12/2019 ARI_s5

2/20

5-2Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

Data transmission on the Radio Interface

Upon completion of this lesson, you will be able to:

- Show why data have to be processed before transmission

- Describe the data transmission and reception chains

- Explain the role of each adapter- Describe the Radio Link Protocol

Objectives

8/12/2019 ARI_s5

3/20

5-3Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

USER DATA

TRANSMISSION

BETWEEN

FAX OR COMPUTER

AND

A NETWORK

BSSMS

64 kbit/s

asynchronous

or synchronous

from 300 bit/s

to 14400 bit/s

A RATE ADAPTATION

IS NEEDED

2 PROTECTION MODES

Transparent Non Transparent

Data Transmission Overview

22.8 kbits/s

8/12/2019 ARI_s5

4/20

5-4Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

RA0

ASYNCHRONOUS

300 - 14400 bit/sSYNCHRONOUS

600 - 14400 bit/s

SYNCHRONOUS

1200 - 14 400 bit/s

RA1'

AIR INTERFACE

RA1'/RA1

3.6, 6, 12 or 14.5 kbit/s

8 or 16 kbit/sRA2

64 kbit/s

BSS

MS

3.6, 6, 12 or 14.5 kbit/sTCU BTS

S 7

S 7

22.8 kbit/s

22.8 kbit/s

InformationProcessing

(Section 7)

Transparent Transmission

8/12/2019 ARI_s5

5/205-5Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

RLP/

L2R

ASYNCHRONOUS

300 - 9600 bit/s

SYNCHRONOUS

1200 - 9600 bit/s

AIR INTERFACE

MS

RA1'/RA18 or 16 kbit/s

RA264 kbit/s

BSS

6, 12 or 14.5 kbit/sTCU BTS

S 7

22.8 kbit/s

22.8 kbit/s

InformationProcessing

(Section 7)

S 7

14.4 kbits/s

6 or 12 kbit/s

14.5 kbits/s

Non Transparent Transmission

8/12/2019 ARI_s5

6/205-6Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

Asynchronous-to-Synchronous Conversion

DATA

START BIT STOP SIGNAL

ADD OF A

SHORT DELAY

SKIP OF A

STOP SIGNAL

REGULAR

CLOCKASYNCHRONOUS

SYNCHRONOUS

Only T mode

(300 - 14400 bit/s)

Rate Adapter 0

8/12/2019 ARI_s5

7/205-7Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

12

bits

Modem

Control

Signals (8 bits)

Network

Independent

Clocking (3 bits)

Multiframe

Synchronization

(1 bit)

12

bits12

bits

12

bits48 bits

60 bits

6 kbit/s

only sub-multiplesof 24 bits

BIT REPEATING

up to 24 bits

24 bits

36 bits

3.6 kbit/s

4800 bit/s600 - 2400 bit/s 9600 bit/s

48 bits

60 bits

12 kbit/s

every10 ms

every10 ms

every5 ms

Only T mode

14 400 bit/s

36 bitsevery2.5 m

288 bits

every20 m

2

bits

290 bits

14.5 kbit/s

Rate Adapter 1'

2

bits

Modem bits

M1 and M2

x 8

8/12/2019 ARI_s5

8/205-8Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

Only NT mode

every 20 ms

12 kbit/s

(4.8 - 9.6 kbits/s)

every 40 ms

6 kbits/s or 14.5 kbits/s

(300 - 2400 bits/s) (14.4 kbits/s)

INFORMATION

200 or 536 Bits 24 bits16 bits

FCS Field:

transmission

error detectorHeading

Asynch.: 300 - 14400 bit/s

Synch.: 1200 - 14400 bit/s

OR

Radio Link Protocol

8/12/2019 ARI_s5

9/205-9Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

60 bits

6 kbit/s

36 bits

3.6 kbit/s

60 bits

12 kbit/s

8 kbit/s 16 kbit/s

every10 ms

every10 ms

every5 ms

60 bits

DATA BIT

DOUBLING(only for 24 bits)

80 bits 80 bits

20

bits

20

bits

Only T mode T & NT modes T & NT modes

20

bits

User Data Rate

(3 bits)

Synchronization

Bits (17 bits)

80 bits

20

bits

Rate Adapter 1' / Rate Adapter 1

30

bits

User Data Rate

of 14.4 kbit/s

(4 bits)

Idle or data frame(1 bit)

Z bits (8 bits)

Synchronization

bits (17 bits)

290 bits

14,5 kbit/s

16 kbit/s

every20 ms

320 bits

30

bits

T & NT modes

8/12/2019 ARI_s5

10/205-10Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

ied

or

disc

lose

dw

ithou

tperm

iss

ion

".

8 kbit/s

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1 1 1 1 1

7 ADDED BITS

16 kbit/s

1 1 1 1 1 1 1 1 1 1 1 11 1 1 1 1 1 1 1 1 1 1 1

64 kbit/s

6 ADDED BITS

1

Rate Adapter 2 For T and NT Modes

8/12/2019 ARI_s5

11/205-11Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecop

iedor

disc

lose

dw

ithou

tperm

iss

ion

".

VLR

MSC

BSC/

TCU

IWF

ISDN TA

V.32bis

modem

Data (9.6 kbps)

Standard fullrate traffic channel used

Less bits availablefor error correction

22.8 kbps

Data (14.4 kbps) ErrorCorrection

ErrorCorrection

50% higher data throughput using same bandwidth

NSS and BSS software upgrade only

14.4 data terminals expected on the market for 1Q99

V11

ISDN

PSTN

Increase of the Transmission Rate

14.4 kbits/s Channel Coding

8/12/2019 ARI_s5

12/205-12Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

2 techniques are used to increasethe data transmission rate

tSingle TS allocation

TDMA frame

Multiple TS allocation

MULTIPLE TS ALLOCATION

(used by HSCSD and GPRS)

TDMA frame

Circuit mode: fixed allocation of the TS

Packet mode : sporadic allocation of the TS

according to the needs

REAL TIME TS ALLOCATION:

static or dynamic blocks

allocation

(used by GPRS)

Increase of the Transmission Rate

t

t

t

TS Allocation

8/12/2019 ARI_s5

13/20

5-13Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

PSTN/ISDN

HLR

BSS

GSM

NSS

GPRS

Core Network

IP, X.25, ...

V12

GPRS

Impact on the Network Architecture

TCU MSC GMSC

PCU

SGSN GGSN

8/12/2019 ARI_s5

14/20

5-14Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

GPRS

NETWORK

GSM

NSS

BSC

CCU

PCU

PDCH DL

PDCH UL

CS1

CS2

CS3

CS4

data Headers andprotection

22.8 kbits/s

V12

GPRS

Impact on the GPRS Access Network

TCU

CS: Coding Scheme

8 kbits/s

12 kbits/s

14.4 kbits/s

20 kbits/s

8/12/2019 ARI_s5

15/20

5-15Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

GSM TS (circuit switched)

GPRS

PDCH Allocation

TDMA 1 TS0 TS1 TS2 TS3 TS4 TS6TS5 TS7

TS0 TS1 TS2 TS3 TS4 TS6TS5 TS7

TS0 TS1 TS2 TS3 TS4 TS6TS5 TS7

TS0 TS1 TS2 TS3 TS4 TS6TS5 TS7

TDMA 2

TDMA 3

TDMA 4

Combined GSM/GPRS TS

Configuration TCH/PDTCH

GPRS TS (PDCH: packet switched)

Possible configurations:

PDTCH

PCCCH/PDTCH

PBCCH/PCCCH

PBCCH/PCCCH/PDTCH

8/12/2019 ARI_s5

16/20

5-16Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

GPRS

Packet Logical Channels

GPRS

CORE

NETWORK

BSC

PCUSN

PDCH = Packet DataCHannel

PPCH

PAGCH

PNCH

PDTCH

PACCH

PTCCH

PDTCH

PACCH

PTCCH

PBCCH

PRACH

DL

UL

Packet CommonControl

CHannels

Packet

TrafficCHannels

PBCCH

8/12/2019 ARI_s5

17/20

5-17Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

Cycle of 52 TDMA frames divided in: 12 radio blocks B0-B11 (of 4 consecutive frames)

4 idle frames (X)

Idle frames

Radio Blocks

TDMA Frame 0 1 2 3 4 5 6 7 8 9 101112131415161718192021222324252627282930313233343536373839404142434445464748495051

Block B 0 B 1 B 2 1 B 3 B 4 B 5 2 B 6 B 7 B 8 3 B 9 B 10 B 11 4

GPRS

Multiframe Structure on a PDCH

0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7

GPRS Time Slot (PDCH)TDMA Frame

= 4.615 ms

8/12/2019 ARI_s5

18/20

5-18Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

Mobile data bandwidth explosion in the next 3 years

th

roughputkbps

10 k

100 k

64 k

1 M

2 M

1 k

98 99 00 01 02 timeframe

EDGE

UMTS

GPRS

alternative: A2

30 min delay

HSCSD

9.6

SMS

14.4

Mobile Data Technology Evolution

8/12/2019 ARI_s5

19/20

5-19Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".

1- Give the 2 possible transmission modes for data

2- Give the role of RA0 and RA1'

3- What is the rate of coded information

transmitted on the Radio Interface?

4- Give some techniques that enable to increase

the data transmission rate

5- Give the main characteristics of GPRS

Check Your Learning

8/12/2019 ARI_s5

20/20

5-20Data TransmissionPE/TRD/GR/0109 12.02/EN February, 2000

"Con

fiden

tia

linforma

tion--m

ayno

tbecopie

dor

disc

lose

dw

ithou

tperm

iss

ion

".