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GPRS Plattform

GPRS (General Packet Radio Service) is the world's most ubiquitous wireless data service, available now with almost every GSM network. GPRS is a connectivity solution based on Internet Protocols that supports a wide range of enterprise and consumer applications. With throughput rates of up to 40 kbit/s, users have a similar access speed to a dial-up modem, but with the convenience of being able to connect from anywhere. GPRS customers enjoy advanced, feature-rich data services such as colour Internet browsing, e-mail on the move, powerful visual communications such as video streaming, multimedia messages and location-based services.

For operators, the adoption of GPRS is a fast and cost-effective strategy that not only supports the real first wave of mobile Internet services, but also represents a big step towards 3GSM (or wideband-CDMA) networks and services.

 
GPRS Class Type

The class of the device determines the speed at which GPRS can be used.

For example, the majority of GPRS terminals will be able to download data at speeds of up to 24Kbps (kilobytes per second). At the higher end, speeds are theoretically possible up to 171.2 kbit/sec when 8 slots are assigned at the same time to a single user. In reality 40-50Kbps.

PC cards capable of GPRS will send data up to speeds of 48Kbps.

Compare this to current data speeds available:

Type
Uplink (Sending)
Downlink (Receiving)
GPRS
14 kbps
28-64 kbps
GSM CSD
9.6-14 kbps
9.6-14 kbps
HSCSD
28 kbps
28 kbps
Dial-UP
56 kbps
56 kbps
ISDN Standard
64 kbps
64 kbps
ADSL
256 kbps
512 kbps
Broadband
2 Mbps
2 Mbps

GPRS Multislot Classes

Multislot classes are product dependant, and determine the maximum achievable data rates in both the uplink and downlink directions.

Written as (for example) 3+1 or 2+2, the first number indicates the amount of downlink timeslots (what the mobile phone is able to receive from the network).
The second number indicates the amount of uplink timeslots (how many timeslots the mobile phone is able to transmit).

The active slots determine the total number of slots the GPRS device can use simultaneously for both uplink and downlink communications.

Multislot Class Downlink Slots Uplink Slots Active 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
4
8
4
1
5
9
3
2
5
10
4
2
5
11
4
3
5
12
4
4
5

Futher Examples:

Class 2   Class 4
One Up, Two Down - (2+1)   One Up, Three Down - (3+1)
8-12Kbps Send - 16-24Kbps Receive   8-12Kbps Send - 24-36Kbps Receive
Mororola Accompli A008
Trium Mondo, Sirius
  Motorola TimeportT260
     
Class 6 - Configurable between   Class 8
Two Up, Three Down   One Up, Four Down
16-24Kbps Send - 24-36Kbps Receive   8-12Kbps Send - 32-40Kbps Receive
Or Three Up, Two Down   Ericsson T39, R520
Motorola v60i, v66i
Samsung Q200, S100
Siemens S45, ME45, M50
Trium Eclipse
24-36Kbps Send - 16-24Kbps Receive  
Nokia 6310, 6510, 8310  
     
Class 10- Configurable between   Class 12- Configurable between
One Up, Four Down   One Up, Four Down
8-12Kbps Send - 32-48Kbps Receive   8-12Kbps Send - 32-48Kbps Receive
Or Two Up, Three Down   Or Two Up, Three Down
16-24Kbps Send - 24-36Kbps Receive   16-24Kbps Send - 24-36Kbps Receive
Philips Fisio 820   Or Three Up, Two Down
    24-36Kbps Send - 16-24Kbps Receive
    Or Four Up, One Down
    32-48Kbps Send - 8-12Kbps Receive
    Sierra Wireless Aircard 750
GSM/GPRS PC Card

Class A, Class B & Class C?

The class indicates the mobile phone capabilities.

Class A
Class A mobile phones can be connected to both GPRS and GSM services simultaneously.


Class B
Class B mobile phones can be attached to both GPRS and GSM services, using one service at a time. Class B enables making or receiving a voice call, or sending/receiving an SMS during a GPRS connection. During voice calls or SMS, GPRS services are suspended and then resumed automatically after the call or SMS session has ended.


Class C
Class C mobile phones are attached to either GPRS or GSM voice service. You need to switch manually between services.


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