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UMTS. GSM GPRS services upto 160 kbit/s. PDS services low bit rates. EDGE. GSM HSCSD services upto 38.4 kbit/s (later up to 64 kbit/s). GSM CS data services upto 9.6 kbit/s. 91/92. GSM Data evolution. Functionality. 98. 99/00. 02. GPRS evolution towards 3 rd Generation.

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gsm data evolution

UMTS

GSM GPRS services upto 160 kbit/s

PDS services low bit rates

EDGE

GSM HSCSD services upto 38.4 kbit/s (later up to 64 kbit/s)

GSM CS data services upto 9.6 kbit/s

91/92

GSM Data evolution

Functionality

98

99/00

02

gprs evolution towards 3 rd generation
GPRS evolution towards 3rd Generation
  • HSCSD “High Speed Circuit Switched Data”
  • 1st step in GSM Phase 2+ that clearly increase achievable data
  • Rates in the GSM System
  • 14.4kbps Channel Coding =115.2kbps for 8 Tsl
  • Maximum data rate is limited to 64kbps due to CN a A-Interface
  • limitation
  • Precondition:
  • Modify GSM Network to support HSCSD in BSC & MSC
  • Handsets has to support Multislot Capabilities
  • Today HSCSD (Data Cards)Handsets support 4 Tsl in Downlink
  • and up to 2 Tsl in Uplink Direction
gprs evolution towards 3 rd generation3
GPRS evolution towards 3rd Generation
  • Depending on the Cell Configuration amount of Users is
  • restricted
  • Multiple User cannot share a Tsl at the Air Interface
  • Depending on the Bearer Nature “Circuit Switched” a Tsl
  • is dedicated to a Subscriber
  • Amount of Subscriber per Tsl is limited to 1
  • Circuit Switched Data has a long access time
  • Call Charging is based on connection time
gprs evolution towards 3 rd generation4
GPRS evolution towards 3rd Generation
  • GPRS “General packet Radio System”
  • Connections do not reserve resources permanently, which is
  • Highly efficient for applications with a bursty nature
  • Short access time to the Network
  • Charging model can be based on transmitted volume
  • GPRS brings packet switched bearer services to the existing
  • GSM System
  • User can Access Public Data Network directly using their
  • Standard protocol addresses (IP, X.25)
  • GPRS Mobile can use between 1-8 channels over the air

interface depending on the MS capabilities

gprs evolution towards 3 rd generation5
GPRS evolution towards 3rd Generation
  • Resource allocation is dynamic and dependent on demand and
  • Resource Availability
  • Packets can be sent on idle time between speech call

depending MS class types

  • Possible traffic types
  • point to point
  • point to multipoint (postponed to Release 4&5)
  • SMS capability
  • Anonymous access (planned)
  • Maximum Theoretical throughput per MS using 8 Tsl without

Error Correction is 160kbps

gprs logical architecture
GPRS Logical Architecture

SMS-GMSC

SM-SC

SMS-IWMSC

E

C

Gd

MSC/VLR

HLR

D

Gs

Gc

A

Gb

Gr

Gi

TE

PDN

TE

MT

BSS

SGSN

GGSN

Gn

R

Um

Gp

Gf

EIR

GGSN

Other PLMN

Signaling Interface

Signaling and Data Transfer Interface

gprs logical architecture7

Traffic & Signaling

Signaling

GPRS Logical Architecture

ISDN/PSTN

EIR

Um

GMSCMSC/VLR

BTS

Gf

AUC

Gr

HLR

Gs

BSC

External

IP Network

Gb

Notebook & GPRS mobile

SGSN

Gn

IP-Backbone

Network

External

IP Network

GGSN

Gi

BTS - Base Transceiver Station

BSC - Base Station Controller

MSC - Mobile Switching Centre

HLR - Home Location Register

SGSN - Serving GPRS Support Node

GGSN - Gateway GPRS Support Node

PTM-SC - Point-to-Multipoint Service Centre

External

X.25 Network

PTM-SC

gprs network node functionality
GPRS Network Node Functionality
  • SGSN and GGSN are IP based packet switching nodes
  • SGSN supports basic mobility management, session management, subscription checking, charging
  • GGSN supports session management, charging and provides interconnect points to ISPs (Internet Service Provider)
  • BSC (PCU) supports the Radio Link- and MediumAccess Control protocol (RLC/MAC)
  • BTS supports new channel coding and interleaving
  • HLR supports subscriber data management
gprs mobiles
GPRS Mobiles
  • Class A: Simultaneous usage of Circuit- and Packet switched services (2 TRX=Dual Transfer Mode DTM is precondition).
  • Class B: Automatic choice of service, Circuit- or Packet switched, but only one at a time (1 TRX). Suspension/resumption of GPRS services at setup/release of CS connection.
  • Class C: Manually selected use of either Circuit- or Packet switched service. Special case is a packet only MS (1TRX).
gprs mobile station multislot classes

Class

Download

Upload

Max.slots

1

1

1

2

2

2

1

3

3

2

2

3

4

3

1

4

5

2

2

4

6

3

2

4

7

3

3

5

8

4

1

5

9

3

2

5

10

4

2

5

11

4

3

5

12

4

4

5

13

3

3

unlimited

14

4

4

unlimited

15

5

5

unlimited

16

6

6

unlimited

17

7

7

unlimited

18

8

8

unlimited

19

6

2

unlimited

20

6

3

unlimited

21

6

4

unlimited

22

6

4

unlimited

23

6

6

unlimited

24

8

2

unlimited

25

8

3

unlimited

26

8

4

unlimited

27

8

4

unlimited

28

8

6

unlimited

29

8

8

unlimited

GPRS Mobile Station “Multislot Classes”
gprs transmission plan
GPRS Transmission Plan

Application

IP / X.25

IP / X.25

SNDCP

SNDCP

GTP

GTP

UDP/

TCP

UDP/

TCP

LLC

LLC

RLC

RLC

BSSGP

BSSGP

IP

IP

Frame

Relay

Frame

Relay

MAC

MAC

L2

L2

GSM RF

GSM RF

L1bis

L1bis

L1

L1

MS

BSS (PCU)

SGSN

GGSN

Gi

Gb

Gn

Um

gprs handset ip address assignment
GPRS Handset IP Address Assignment
  • Mobile User connects to specified APN
  • APN is configured in the GGSN
  • Kinds of Handset IP address assignment
    • GGSN pool per APN Subscriber IP Address assignment
    • external DHCP Server
    • Intranet DHCP Server
    • Fixed IP Address Assignment in the HLR per Subscriber

and APN (not or!!)

gprs routing and address plan
GPRS Routing and Address Plan

IPv4 ‣used In GPRS Backbone (public & private)

‣used for Handsets (public & private)

IPv6 ‣Backbone can support with Release 99

implementation

‣current used GPRS capable Handsets

does not support IPv6

‣1st steps visible for UMTS Handsets only

gprs routing and address plan15
GPRS Routing and Address Plan
  • Further necessary Routing Instrument for GPRS
  • TLLI=Temporary Logical Link ID
  • Routing Area
  • Location Area
gprs routing and address plan16
GPRS Routing and Address Plan

Gb Interface Gn Interface

SGSN<->BSC SGSN<->GGSN

BVCI /LA/RA

GTP Address

Tunnel ID =IMSI

Handset IP

Handset IP

TLLI

avoid collision at the air interface
Avoid Collision at the Air Interface

Data Transmission divided in to Up- and Downlink Data Traffic

gprs quality of service profile
GPRS Quality of Service Profile
  • 1)Delay for packets of 128 octets;
    • Delay class 1 (mean 0.5 sec, 95% < 1.5 sec)
    • Delay class 2 (mean 5 sec, 95% < 25 sec)
    • Delay class 3 (mean 50 sec, 95% < 250 sec)
    • Delay class 4 (unpredicted)
  • 2) Reliability
    • Reliable data transfer (retransmission, delay)
    • Unreliable data transfer (no retrans., small delay)
    • Unreliable data transfer, erroneous data discarded (no retrans., small delay, data loss)
gprs quality of service profile21
GPRS Quality of Service Profile
  • 3) Priority
  • Priority class 1 (highest priority)
    • Priority class 2
    • Priority class 3
    • Priority class 4 (lowest priority)
  • 4) Mean and 5) Peak throughput
further steps
further Steps
  • Packet Handling (PBCCH/PCCCH)
  • QoS Negotiation (Air <->GGSN)
  • Increasing USF Granularity
  • IPv6
  • Network Mode Changes to decrease MS signalling
  • MS with higher Multislot Capabilities
  • Extended MAC Modes
  • Technology
  • EDGE GPRS with 8PSK modulation
  • UMTS
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