Sony Ericsson P1 manual Positioning, Gprs

White paper Sony Ericsson P1

Positioning

The basic cost efficient positioning method available in 3G networks relies on measuring round-trip time. In 3G it is called Cell-ID + TA (Timing in Advance).

Time difference measurement, involving several base stations, can be used to obtain a more accurate position.

Positioning methods are already used to support location-based information services such as ©YellowPages, restaurant guides, traffic information, directions and friend finder applications. Typically, SMS or voice messages, has been used as delivery mechanism. Java™ and MMS messages will add new possibilities to deliver attractive location-based applications.

GPRS

The introduction of GPRS was a big step in the evolution of the GSM networks for enhancing the capabilities of data communication. Data traffic has increased (over both wired and wireless networks), with the growth in demand for Internet access and services paralleling that of mobile communications.

We can now see that the demand for high-speed Internet access is the key driver for coming generations of wireless multimedia and entertainment services, and GPRS is important as a stepping stone when we enter the 3G network era. GPRS has allowed innovative services to be created and granted access to new and previously inaccessible market segments, which will be further developed with 3G.

GPRS is able to take advantage of the global coverage of existing GSM networks. Applications developed for GPRS have been deployed on a large scale and have thus reaped the associated benefits.

With GPRS, Sony Ericsson P1 sends data in “packets” at a very high speed. The phone remains connected to the network at all times, using transmission capacity only when data is sent or received. Instead of occupying an entire voice channel for the duration of a data session, Sony Ericsson P1 sends and receives data in small packets, as needed, much like IP on the Internet. Thanks to this, the phone is always online, using transmission capacity only when data is sent or

received. Sony Ericsson P1 is compatible with GPRS R99. The GSM system limits the ability to use all eight time slots, so Sony Ericsson P1 uses up to four time slots for receiving data, and up to one slot for transmitting.

Information about the identity of the phone and the characteristics of the connection are described in the PDP (Packet Data Protocol) context. This information is stored both in the phone and in the mobile network, so that each phone is identified and “visible” to the system.

Using GPRS with Sony Ericsson P1 has many advantages:

•Constant connection – Keep an open connec- tion to an email system or the company net- work, staying online to receive and send messages at all times. All connection settings can be managed by using the data connections feature.

•High speed – Gain access automatically to increased band-width when downloading large files, images etc.

•Cost efficient – Use transmission capacity only when needed, thus reducing costs.

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53 May 2007