移动台的GPRS 类型 ( MS's GPRS Class Type)

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.