General Packet Radio Service(GPRS)

General packet radio service (GPRS) is a packed orientedavailable to users of the cellullar communication systems (GSM), as well as in the systems. In the 2G systems, GPRS provides data rates of 56-114 kbit/s.GPRS data transfer is typically charged per megabyte of traffic transferred, while data communication via traditional is billed per minute of connection time, independent of whether the user actually is using the capacity or is in an idle state. GPRS is a best effort packet switched service, as opposed to, where a certain (QoS) is guaranteed during the connection for non-mobile users.cellular systems combined with GPRS are often described as, that is, a technology between the second and third generations of mobile telephony.

It provides moderate speed data transfer, by using unused (TDMA) channels in, for example, the GSM system. Originally there was some thought to extend GPRS to cover other standards, but instead those networks are being converted to use the GSM standard, so that GSM is the only kind of network where GPRS is in use. GPRS is integrated into GSM Release 97and newer releases. It was originally standardized by (ETSI), but now by the (3GPP).GPRS originally supported (in theory) (IP), (PPP) and connections. The last has been typically used for applications like wireless payment terminals, although it has been removed from the standard. X.25 can still 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., user equipment (UE). In practice, the mobile built-in browser uses.

In this mode PPP is often not supported by the, while is not yet popular. But if the mobile is used as a modem to the connected computer, PPP is used to tunnel IP to the phone. This allows an IP address to be assigned dynamically to the mobile equipment.When is used, each phone can have one or more allocated. GPRS will store and forward the IP packets to the phone during cell handover (when you move from one cell to another). A radio noise induced pause can be interpreted by TCP as packet loss, and cause a temporary throttling in transmission speed.Are connected to either GPRS service or GSM service (voice, SMS). Must be switched manually between one or the other service.

A true Class A device may be required to transmit on two different frequencies at the same time, and thus will need two radios. To get around this expensive requirement, a GPRS mobile may implement the feature. A DTM-capable mobile may use simultaneous voice and packet data, with the network coordinating to ensure that it is not required to transmit on two different frequencies at the same time. Such mobiles are considered pseudo-Class A, sometimes referred to as "simple class A". Some networks are expected to support DTM in 2007.GPRS is technology in which speed is a direct function of the number of TDMA time slots assigned, which is the lesser of (a) what the particular cell supports and (b) the maximum capability of the mobile device expressed.