Theory about GPRS- What is GPRS

What is GPRS?
GPRS stands for general packet radio service.It is a pocket oriented mobile data service available in global system of mobile communication.The speed of GPRS can be observed from 56kb/s to 114 kb/s.GPRS Theory of technology is mainly used in services such as wireless application protocol,short messages services,multimedia messaging service and for internet communication such as email and world wide access. GPRS Theory states that the data transfer is typically charged per megabyteof traffic transferred. Have you heard about 5g cellular systems? if not checkout this: 2Gcellular systems is a combination with GPRS are often called as "2.5G", that is, a technology between the second (2G) and third (3G) generations of mobile telephony. moderate speed data transfer, by using unused time division multiple access(TDMA) is provided by GPRS e.g GSM system.Several work has been done to improve the standard of GPRS but GSM standard is considered as apt for GPRS usage.

The multiple access methods used in GSM with GPRS are based on Frequent division duplex (FDD) and TDMA. During a particular period, a person is granted a job to one pair of up-link and down-link frequency channels. This is combined with time division multiplexing (TDM), i.e. packet mode communication, This concept states that the packets creates a possibility which provides the facility for several users to make use of same frequency channel. The packets have their own constant defined length, which corresponding to a GSM time slot. This phenomena works under FIFO condition which is nothing but First comes first serve. while the up-link uses a scheme very similar toreservation ALOHA. This means that slotted ALOHA(S-ALOHA) is used for reservation inquiries during a contention phase, and then the actual data is transferred using dynamic TDMA with first-come first-served scheduling.

GPRS Theory works originally on supported internet protocol and point to point protocol(P2P) .This also supports X.25.X.25 is typically used for wireless payment terminals. X.25 can be supported over PPP, or even over IP, but doing this requires either a router to perform encapsulation or intelligence built in to the end-device/terminal e.g. UE(User Equipment).PPP is not supported by mobile phone operator.thus mobile built in browser uses Ipv4,Ipv6 is not popular.There are three categories of class observed such as:

CLASS A:In this both GPRS and GSM service can be used at a time.
CLASS B:Can be connected to both GPRS and GMS service but both cannot be used simultaneously.Only one can be used at a time.
CLASS C:In this it can be connected to either GPRS or GMS at a time.

Well ordered Coding scheme in GPRS service are as follows:
1)CS-1 having speed 8 kb/s.
2)CS-2 with a speed of 12 kb/s.
3)CS-3 having speed of 14.4 kb/s.
4)CS-4 having speed of 20.4kb/s.

GPRS provides the following service such as:

1)Multimedia messaging service.
2)Push to talk over cellula Poc/PTT.
3)Instant messaging and presence-wireless image.
4)Internet application through smart devices using wireless application protocol.
5)Short message service.
6)Point to point service internetworking with Internet.

With these enhancements the active round-trip time can be reduced, resulting in significant increase in application-level throughput speeds.These are the benifits with GPRS.