GPRS

in Internet, Technology

Introduction to GPRS

GPRS stands for General Packet Radio Services. GPRS is available to IS-136 and GSM mobile phones users. GPRS is also described as “2.5Gâ€, a technology that is in between 3G and 2G. It uses the unused channels in the GSM system and offers moderate data transfer speed. Originally it was thought that GPRS will be allowed for other standards as well, but things have gone other way round. Now other standards are adding support for GPRS.

In many areas such as Finland, GPRS has become very economical. Some operators charge it for per kilobyte basis while others according to the time it is used. In 2000, when GPRS was instructed, it was very expensive. In Europe some operators charged as high as €20 per megabyte.

Services offered by GPRS compatible GSM mobile device include Point-to-Point (PTP) service, instant messaging, Push To Talk (PTT) and Multimedia Messaging Service (MMS).

GPRS: Packet-Switched Data Transfer

GPRS is based on packet-switched data transfer, which is much different from the old fashioned CSD or Circuit Switched Data connection. In CSD a dedicated connection is established from source to destination. This connection uses full bandwidth for that particular circuit as long as the circuit is not terminated. Disadvantage of this system is under utilization of resources. A circuit (our resource) may remain idle for some time, when data is neither being sent nor received, but still full bandwidth is dedicated to that particular circuit.

In GPRS we use packet-switching, which allows the utilization of same channel by different users. Data is only transmitted on request and hence the channel is free for requests from other users. Hence GPRS offers much efficient usage of the available bandwidth. Unlike circuit-switched connection, data transfer through GPRS is billed per kilobyte on information sent or received. This allows users to pay for quality of service instead of quantity ore duration of their connection.

Classification of GPRS

According to capability of GPRS, it can be classified as Class A, B, and C. Class A devices allow connection to GSM (SMS and voice) and GPRS service at the same time. Devices belonging to Class B can only use one service at a time i.e. either GPRS or GSM. During GSM activity (SMS or a phone call) GPRS is automatically suspended and is resumed when the GSM activity is terminated. This class is most common. Class C devices must be switched manually between GSM and GPRS.

Class A mobile phones are expensive because they require two radios. These radios allow the cell phone to transmit two different frequencies at the same time. A cheaper solution to the two radio problem is DTM (Dual Transfer Mode) option. Mobile phones using DTM are categorized as pseudo Class A.

Performance of GPRS is best described its Multislot Class. Speed of GPRS is directly proportional to TDMA time slots. Multislot Class starts from 1 to 12 and then jumps directly to 32. Here Class 32 GPRS has the best performance of all the classes.

Comments

Could you please let me: 1)

Could you please let me:

1) know the data transfer speed of GPRS class 32?
2) have a small partial list of the various mobile phones GPRS Class 32 enabled?

Thank you in advance

Here is you anawer: 1)Speed

Here is you anawer:

1)Speed of GPRS class 32?

Absolute Speed of GPRS is difficult to quantify and is highly dependent on your service provider. Here are the factors that stermine speed of GPRS:

i) Number of slots supported by your mobile device or base station/service provider.
ii) Your distance from base ststion.
iii) Amount of load/traffic on your base station. GPRS is assigned the free bandwidth that is currently no utilized by calls.

To find out no of slots contact your service provider. maximum capability of the mobile device expressed as a GPRS Multislot Class. Multislot Class 32 is you desired one. Here are its specifications:

Downlink Slots: 5
Uplink Slots: 3
Active Slots: 6

I think the actual speed should be around 177-296 kbps, but again it depends on the service provider and base stations.

2) List of the GPRS Class 32 enabled?

Nokia: N95, Nokia 5700 XpressMusic, N77, N70, N72, N73, N91

You can search google if you need a comprehensive list.
Hope that helps.

Phones with class 32 gprs

i think n70 n 73 are nt class 32... as said by the previous post..

Maximum internet speed connection with Nokia E66

I bought a Nokia E66 to improve the internet connection of my old E65, but when I make a GPRS connection with the E65, the maximum speed is 460.8Kbps/s, while it is 115.2Kbps with the E65. is that normal?

Low GPRS Speed

Technically speaking your new E66 should support for speeds as high as 1.8 and 3.6 Mbps. There could be many reasons, two common reasons could be:
- The service provider may not have support for high speeds.
- Some cellular operators charge an activation/monthly fee for high speeds.

In both cases you have to call their toll free helpline to confirm.

I do simultaneous tests, at

I do simultaneous tests, at the same time, and with the same connection, but the one of the E65 is greater than the E66.do you think that a bought a fake phone?

Did you try the previous two

Did you try the previous two solution I suggested. There might be another reason that you may not have EDGE/3G coverage in you geographical area. This is a quite common problem. If that's not the reason then proceed further.

Is there any option for the Max Connection Speed? There might be some default setting restricting the GPRS speed.

If still not fixed, your cell phone might be defective or fake. Is your cell phone still under warranty period? If yes you can take it to you dealer. But first save your IMEI (International Mobile Equipment Identity) number. In most Nokia phones, simply press: * # 06 # reveals the code. Now get in touch with you dealer hope they repair or replace it.

Hope it helps. Lets us know what was the outcome.