GPRS Intro

L e li l i w a T rai ra i ni n g C en tr e

General Packet Radio Service (GPRS) &

Enhanc Enhanced ed Data rates rates for for GSM Evolut Evolution ion (EDG (EDGE) E)

J ak ak u b B l u s z c z

Leliwa Training Centre, Leliwa Telecom Sp. z o.o ul. Garncarska Garncarska 3/7, 31-115 Kraków, Kraków, Poland, e-mail: e-mail: jakub.bluszcz@lel [email protected] iwa.com m

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GSM, GPRS and UMTS data services Traditional GSM data services:

EDGE Enhanced Data Rates for GSM Evolution

- data call 9.6 kbits/s (14.4 kbits/s) - SMS

28.8, 32, 43 kbit/s

HSCSD High Speed Circuit Switched Data: (more than 1 Time Slot T S per subscriber

!

high bit rate)

- data call call 4 TS x 9.6 (14.4) (14.4) kbits/s kbits/s ! 38.4 (57.6) kbits/s

2 x 32 ! 64 kbits/s (8 x 43 ! 350 kbits/s)

GPRS General Packet Radio Service: (more than 1 Time Slot T S per subscriber

!

high bit rate)

4 x 59.2

!

236,8 kbits/s


















Circuit Switching v Packet Switching CS data call

PS packet transfer

g u a r an an t e e d r e s o u r c e s

n o g u a ra r a n t ee ee d r e s o u r c e s

c o n s t a n t d e l ay ay

variable d elay ela y

c o n s t a n t b i t r at at e

variable bit rate


















GSM/GPRS Network Architecture SMS G-, IW-

VLR MSC AUC

Gd Gs Um

BSS

Gb

EIR

HLR

Gf Gr

Gc

Packet Packet Data DataNet Net


















GSM/GPRS Network Architecture (description) AUC

Authentication Centre Centre

BSS

Base Station System

EIR

Equipment Identity Register

GGSN Gateway GPRS Support Node GMSC Gateway Mobile Services Switching Centre HLR

Home Location Register

MSC

Mobile Services Switching Centre

SGSN Serving GPRS Support Node


















SGSN and GGSN functions SGSN SGSN – Servin Serving g GPRS GPRS Supp Support ort Node Node transfer to / from SGSN service area, • packet transfer • security security (authent (authenticatio ication, n, ciphering ciphering and IMEI check), check), • mobilit mobility y mana managem gement ent..

GGSN GGSN – Gatew Gateway ay GPRS GPRS Suppor Supportt Node Node




















VLR and SGSN Service Area VLR Service Area

SGSN Service Area


















Changes to Base Station System PCU PCU – Packe Packett Con Contro troll Uni Unitt


















Changes to GSM Circuit Switch Domain HLR HLR – Home Home Loca Locatio tion n Regi Registe ster r


















IMSI International Mobile Subscriber Identity


















APN Access Point Name Name PL

GSM/GPRS network

Internet Internet (public) (public)
























































































































































































































































































































GPRS GPRS vs GSM GSM Logi Logica call Chan Channe nels ls G S M

GPRS

BCH: - FCCH - SCH - BCCH

CCCH:

PBCCH

PCCCH:

- PCH

- PPCH

- RACH

- PRACH

- AGCH

- PAGCH

optional GPRS logical channels


















GPRS GPRS vs vs GSM Logica Logicall Chan Channel nels s (desc (descrip riptio tion) n) AGCH Access Grand Channel

PCH

Paging Channel

BCCH

Broadcast Control Channel

PDTCH Packet Data Traffic Channel

BCH

Broadcast Channel

PPCH

CCCH

Common Control Channel

PRACH Packet Random Access Channel

DCCH

Dedicated Control Channels

PTCCH Packet Timing Advance Control Ch.

Packet Paging Channel

FACCH Fast Associated Control Ch.

TCH

FCCH

SACCH Slow Associated Control Channel

Frequency Correction Channel

Traffic Channel


















Multiframe structure for GSM and GPRS GSM (example)

51-frame multiframe

F – FCCH FCCH,, B – BCCH, CCH, C – CCH CCH (PC (PCH+ H+AG AGCH CH), ), I - Idle Idle GPRS


















Temp Tempor orar ary y Blok lok Flo Flow Temp Tempor orary ary Blok Blok Flow Flow (TBF) (TBF) – transm transmiss ission ion of of data data block block iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiibetween iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii between MS and the network

MS can be involved in: • uplink TBF • dow downlin nlink k TBF TBF • both both uplin uplink k and and downl downlink ink TBF


















TBF and usage of TFI GSM CS BPC

GPRS PS PDCH




















Uplink State Flag


















Usage of USF GSM CS BPC

GPRS PS PDCH


















GPRS Coding Schemes data block

channel coder

radio block 456 bits


















GPRS MS Mobility Management States Idle


















Routing Area Update #% SGSN
























































































































































































































































































































PDP Context to Home GGSN

HSGSN

HPLMN HPLMN

Gp HLR IGBN IGBN

G

G

leliwa leliwa HGGSN

internet internet


















QoS service precedence classes Class Precedence Name

Interpretation

1

High precedence

Service commitments shall be maintained ahead of all other precedence levels

2

Normal precedence

Service commitments shall be maintained ahead of low precedence


















QoS reliability classes Class Application Characteristics 1

Error sensitive, no error correction capability, limited error tolerance capability

2

Error sensitive, limited error correction capability, good error tolerance capability


















GPRS Charging Architecture Billing System

CGF

Ga

Ga

Ga


















GMSK and EDGE Q “0”

(0,1,0)

+½ π -½π

(0,0,0)

I

Q (0,1,1)

I (0,0,1)

(1,1,1)

“1” (1,0,1)

(1,1,0)




















ECSD Enhanced Circuit Switched Data Three new Traffic Channel types:


















E-GPRS Coding Schemes coding scheme

modulation

max bit rate per TS

MCS-1

GMSK

8.8 kbits/s


















GSM/GPRS/UMTS Network Architecture VLR

SMS G-, IW-

.

MSC


















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GPRS Intro

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