Tuesday, July 27, 2010

Document Management

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Thursday, December 18, 2008

UMTS interoperability and global roaming

Phones UMTS (maps and data) are very mobile-it was designed to move easily on other UMTS networks (assuming your provider has a roaming agreement). In addition, nearly all UMTS phones (except Japan) are UMTS / GSM dual-mode devices, if a UMTS phone moves outside the coverage of UMTS during a call the call May transparent be transferred to the provision of GSM coverage. The roaming charges are generally significantly higher than the cost of regular use.

Most holders of UMTS licences consider ubiquitous, transparent global roaming an important issue. To ensure a high degree of interoperability, UMTS phones usually several different frequencies in addition to their GSM fallback. Different countries support different frequency bands UMTS - Europe first used 2100MHz while the USA used 1700MHz, and telephone and UMTS network must support a common frequency to work together. Because the frequencies used, the first UMTS phone models designated for USA may not be able to work elsewhere and vice-versa. There are now 11 different frequency combinations used in the world-including the frequencies used only for 2G services.

UMTS phones use a USIM (Universal Subscriber Identity Module) (based on GSM SIM) and also accept mobile phone SIM cards. It is a global standard for identification, and allows a network to identify the phone user to authenticate both local and roaming. The roaming agreements between networks to allow calls to a customer to be redirected to them while roaming and determine services (and prices) available to the user. In addition to the user subscriber information and authentication information, USIM provides storage space for reservations, contact telephone. Devices can store their data on their own memory or on USIM card (which is generally more limited in its repertoire details). A USIM can be moved to another GSM or UMTS phone and the phone on the user details of the USIM, meaning it is the USIM (no telephone), which determines the phone number of phone and billing for calls made from the phone.

Japan was the first country to adopt 3G technology, and the fact that they did not use GSM previously they did not need to build GSM compatibility in their equipment and their 3G handsets were lower than those available elsewhere. In 2002, NTT DoCoMo FOMA 3G network was the first W-CDMA network is the first incompatible with the UMTS standard for radio, but standard USIM cards, ie based on USIM card is possible roaming (transfer of USIM card in a GSM or UMTS phone when travelling). Both NTT and Softbank Mobile (which launched 3G in December 2002) are now using the UMTS standard, PDC and their 2G networks operate in parallel.

Edited and Rewritten from Source: http://en.wikipedia.org

Monday, November 10, 2008

The UMTS technology

Combine UMTS W-CDMA, TD-CDMA, TD-SCDMA interfaces, GSM's Mobile Application Part (MAP) core, GSM and the family of speech codecs. In the most popular mobile cellular variant of UMTS, W-CDMA is currently used. It is worth noting that other wireless standards use W-CDMA as their interface air, including FOMA.

On UMTS W-CDMA uses a pair of 5 MHz channels. However, competition CDMA2000 system uses one or more arbitrary 1.25 MHz in each direction of communication. UMTS and other W-CDMA systems are widely criticized for their broad spectrum of use, which delayed the deployment in the country which has acted relatively slowly in the allocation of new frequencies in particular for 3G services (such as the United States, Unis).

The bands originally defined by the UMTS standard are 1885-2025 MHz for mobile-to-basic (uplink) and 2110-2200 MHz for the core mobile (downlink). In the USA, 1710-1755 MHz and 2110-2155 MHz will be used instead, as the 1900 MHz band has already been used. [1] Although UMTS2100 is the most widely deployed UMTS band, some countries UMTS operators use the 850 MHz and / or 1900 MHz (independently, which means uplink and downlink are in the same band), including the United States United by AT & T Mobility, and in Australia by Telstra (850 MHz).

For GSM operators, it is simple but costly migration to UMTS: a large part of the infrastructure is shared with GSM, but the cost of obtaining new spectrum licenses and UMTS above towers existing is high.

A major difference of UMTS compared to GSM is the interface doing radio GSM / EDGE Radio Access Network (Geran). It can be connected to various commodities such as the Internet, ISDN, GSM or UMTS network. Geran includes three lower layers of the OSI model. The network layer (OSI 3) protocols form the protocol Radio resource management (RRM). They manage the bearer channels between mobile terminals and fixed network including transfers.

Edited and Rewritten from Source: http://en.wikipedia.org

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