Sony Ericsson manual General Packet Radio Services, Using Gprs in the J200

White Paper J200

General Packet Radio Services

The introduction of GPRS (General Packet Radio Services) is one of the key steps in the evolution of today’s GSM networks for enhancing the capabili- ties of data communication. Data traffic is increas- ing enormously (over both wired and wireless networks), with the growth in demand for Internet access and services paralleling that for mobile communications.

The demand for high-speed Internet access will be the key driver for coming generations of wireless services, and GPRS can deliver the necessary speed. GPRS allows creation of innovative serv- ices, makes it possible to address new and previ- ously inaccessible market segments and increases customer loyalty.

GPRS applications can be developed as both hori- zontal and vertical. Vertical applications are spe- cific, including those for operations such as reaching police and emergency, taxi, delivery or automated services (vending machines, supervi- sion, vehicle tracking). Horizontal applications are more generic and include those for Internet access, e-mail, messaging, e-commerce and entertain- ment.

GPRS is able to take advantage of the global cov- erage of existing GSM networks. Applications developed for GPRS can be deployed on a large scale and can reap the associated benefits. GPRS also provides a secure medium for connections to banking and financial services.

Using GPRS in the J200

Instead of occupying an entire voice channel for the duration of a data session, the J200 sends/ receives data in small packets, as needed, much like IP on the Internet. Because of this, the J200 maintains a constant online connection, its data transmission abilities summoned by the application in use on an as-needed basis.

The GPRS specification includes four coding schemes – CS1, CS2, CS3 and CS4 – that allow data speeds of 9,050 bps, 13,400 bps, 15,600 bps and max 21,400 bps per slot, respectively. The J200 works with all four coding schemes, but data speed naturally varies according to network config- uration. At the moment, CS-3 and CS-4 are not supported in any live network, i.e, present speed is limited to 53,600 bps.

The GSM system limits the ability to use all eight time slots, so the J200 uses up to four time slots for receiving data, and one slot for transmitting.

This means the speed for receiving data is up to 85,600 bps and up to 21,400 bps for sending data.

Using GPRS with the J200 has several advantages, for example:

•Constant connection

•High speed

•Automatic access to increased bandwidth while downloading large files such as pictures and sounds

•Cost efficiency

•Use of transmission capacity only when needed to reduce cost

•WAP over GPRS

•Access to Internet via WAP at high speed and with a constant connection.

•Provide settings

•Receive GPRS configuration settings from the provider over the air, OTA, making manual con- figuration unnecessary.

•User controlled settings

•Take advantage of full user control in the data connections menu, establishing multiple descriptions and accessing advanced settings for GPRS.

Interruption of GPRS data account

When the user is using WAP via GPRS on the J200, the GPRS connection is automatically discon- nected when the user answers an incoming call. However, when the call has ended, the user is given the possibility to resume the WAP session.

16 November 2004