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Senin, 05 Mei 2008

CDMA 2000


CDMA2000 is the third generation (3G) solution based on IS-95 — more commonly known as cdmaOne. CDMA2000 is an evolution of the 2G wireless standard.

CDMA2000 supports 3G services as defined by the International Telecommunications Union (ITU) for IMT-2000.

3G networks will deliver wireless services with better performance, greater cost-effectiveness and significantly more content and CDMA2000 technology satisfies those goals.

Both cdmaOne and CDMA2000 systems are based on spread spectrum multiple-access technology that has rapidly gained global acceptance by wireless operators.

cdmaOne and CDMA2000 networks spread coded conversations and data transfers over 1.25 MHz of spectrum, allowing a large number of users to simultaneously share the same carrier.

CDMA2000 is one solution for wireless operators who want to take advantage of the new market dynamics created by mobility and the Internet. It is both an air interface and a core network solution for delivering the services that customers are demanding today - sometimes referred to as 3G services.

CDMA2000 is one mode of the Radio Access "family" of air interfaces agreed upon by the Operators Harmonization Group for promoting and facilitating convergence of 3G networks. One goal of the harmonization effort is to provide seamless global roaming between the two different modes of 3G CDMA - CDMA2000 and WCDMA. Ericsson's use of common core technologies allows easy support of the whole family of 3G CDMA modes.

Ericsson's CDMA Systems business unit in San Diego is developing CDMA2000-capable 3G infrastructure products. Ericsson's CDMA2000 portfolio is designed to mitigate risks, protect investments and deliver significant performance boosts to operators as they evolve their networks to offer 3G services.

CDMA2000 networks are backwards-compatible to cdmaOne deployments, protecting operator investments in cdmaOne networks and providing simple and cost-effective migration paths to the next generation. This means that both cdmaOne terminals and CDMA2000 terminals can operate in coverage areas of either network. In addition to offering voice quality and voice capacity improvements, CDMA2000 networks support high-speed, multimedia data services.

Data Support

The CDMA2000 standard is evolving to continually support new services in a standard 1.25 MHz carrier. The first phase of CDMA2000 - or CDMA2000 1X - will deliver peak data rates of 153 kbps. Phase two - labeled CDMA2000 1xEV - will provide for data rates greater than 2 Mbps.

CDMA2000 1X

The IS-2000 standard (CDMA2000 1X) was completed in 2000 and published by the Telecommunications Industry Association (TIA). CDMA2000 1X offers approximately twice the voice capacity of cdmaOne, peak data rates of 153 kbps, backwards compatibility with cdmaOne networks and many other performance improvements. 1X refers to CDMA2000 implementation within existing spectrum allocations for 1.25 MHz carriers. The technical term is derived from N=1 (i.e., use of same 1.25 MHz carrier as in 2G) and the 1X means one times 1.25 MHz.

CDMA2000 1X can be implemented in existing spectrum or in new spectrum allocations. A CDMA2000 1X network will also introduce simultaneous voice and data services and other performance improvements. The backwards compatibility with cdmaOne provided by Ericsson's CDMA2000 solution, further ensures investment protection.

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