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GPRS Technology PPT









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1. GPRS General Packet Radio Service

2. INTRO
GSM was the most successful second generation cellular telecommunications system besides D-AMPS, PHS, PDC and CDMA.
GSM: Is Circuit Switched Support voice and data at a low rate (9.6 kbps), Fax, SMS
Support Roaming
And has a regional cover
Nowadays, the need is for higher data rates

3. GPRS
General Packet Radio Service is a Mobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones.
GPRS data transfer is typically charged per megabyte of transferred data, while data communication via traditional circuit switching is billed per minute of connection time, independent of whether the user has actually has transferred data been an idle state.

4. GPRS
GPRS became the first stepping-stone on the path between the second-generation GSM cell phone system and the W-CDMA / UMTS system.
GPRS is often described as 2.5G
GPRS is an IP Network.
GPRS offer data services with data rates up to 44 115 kbps (5 to 10 times greater than GSM data

5. GPRS-PACKET switching
The key element of GPRS is that it uses packet switched data rather than circuit switched data, and this technique makes much more efficient use of the available capacity
Using a traditional approach a circuit is switched permanently to a particular user. This is known as a circuit switched mode can be shared between several users. To

6. GPRS-NETWORK
GPRS and GSM are able to operate alongside one another on the same network, and using the same base stations. However upgrades are needed The network upgrades reflect many of those needed for 3G, and in this way the investment in converting a network for GPRS prepares the core infrastructure for later evolution to a 3G W- CDMA / UMTS GPRS - General Packet Radio

7. GPRS-MOBILE
Not only does the network need to be upgraded for GPRS, but new GPRS mobiles are also required. It is not possible to upgrade an existing GSM mobile for use as a GPRS mobile, although GSM mobiles can be used for GSM speech on a network that also carries GPRS enable it to transmit the data in the required

8. GSM-NETWORK
Click to edit Master text styles Second level Third level Fourth level Fifth level

9. GPRS-NETWORK
Click to edit Master text styles Second level Third level Fourth level Fifth level

10. GPRS-NETWORK (SGSN)
Although designed to run alongside the GSM system, the core network structure updated for GPRS has several new elements added to enable it to carry the packet data. The network between the BSC and BTS is similar, but behind this there is a new infrastructure to support the packet data For GPRS, the data is routed - from the BSC through what is termed a Serving GPRS Support

11. GPRS-NETWORK (SGSN)
The SGSN serves a number of functions for GPRS mobiles. It enables authentication to occur, and it then tracks the location of the mobile within the network, and ensures that the quality of service is to the required level. For the network protocols there are two layers that are used and supported by GPRS, namely X25 and IP. In operation the protocols assign addresses (Packet Data Protocol or PDP addresses) to the devices network for the

12. GPRS-MOBILES
Not all GPRS mobiles are designed to offer the same levels of service. As a result they are split into three basic categories according to their capabilities in terms of the ability to connect to GSM and GPRS facilities:
Class A: - This class describes mobile phones that can be connected to both GPRS and GSM services at the same time
Class B: - These mobiles can be attached to

13. GPRS-CODING (1)
In order to accommodate the packet data within GPRS it has been necessary to develop the coding schemes. Additionally the layers based on the OSI system has become more important than it was for some of the previous systems. GPRS offers a number of coding schemes with different levels of error detection and correction. These are used dependent upon the radio frequency signal conditions and the requirements for the data being sent. These are

14. GPRS-CODING (2)
CS-4: This scheme is used when the signal is high and interference levels are low. No correction is applied to the signal allowing for a maximum throughput of 21.4 kbps. If all eight slots were used then this would enable a data throughput of 171.2 kbps to be achieved. In addition to the error detection and coding schemes, GPRS also employs interleaving
techniques to ensure the effects of interference 11/24/10 spurious noise General reduced to a minimum.

15. GPRS-LAYERS
Software plays a very large part in the current cellular communications systems. To enable it to be sectioned into areas that can be addressed separately, the concept of layers has been developed. It is used in GSM and other cellular systems but as they become more data- centric, the idea takes a greater prominence. Often these are referred to as layers, 1, 2, and 3. Layer 1 concerns the physical link between the

16. GPRS-PHYSICAL
CHANNEL of physical and logical channels to carry the data payload as well as the signalling required to control the calls. GPRS uses the same modulation and frame structure that is employed by GSM. Slots can be assigned dynamically by the BSC to GPRS calls dependent upon the demand, the remaining ones being used for GSM traffic. There is a new data channel that is used for

17. GPRS-CHANNEL
ALLOCATION one physical channel :(PDCH) for the sending of data, it employs several logical channels that are mapped into this to enable the GPRS data and facilities to be managed. Packets of data are assigned a space within the system according to the current needs, and routed accordingly.
The MAC layer is central to this and there are three MAC modes that are used to control the transmissions. These General named fixed

18. GPRS-LOGICAL CHANNEL
There is a variety of channels used within GPRS, and they can be set into groups dependent upon whether they are for common or dedicated use. Naturally the system does use the GSM control and broadcast channels for initial set up, but all the GPRS actions are carried out within the GPRS logical channels carried within the PDCH. Broadcast channels:

19. GPRS-LOGICAL CHANNEL
Common control channels:
Packet Paging Channel (PPCH): This is a downlink only channel and is used to alert the mobile to an incoming call and to alert it to be ready to receive data. It is used for control signaling prior to the call set up.
Packet Access Grant Channel (PAGCH): This is also a downlink channel and it sends information telling the mobile which traffic channel has been assigned to it. It occurs after

20. GPRS-LOGICAL CHANNEL
Dedicated control channels:
Packet Associated Control Channel (PACCH): This channel is present in both uplink and downlink directions and it is sued for control signaling while a call is in progress. It takes over from the PPCH once the call is set up and it carries information such as channel assignments, power control messages and acknowledgements of received data. Packet Timing Advance Common Control


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