IMT-2000

International Mobile Telecom System - 2000, the third generation Mobile communication System the earliest in 1985 by the International telecommunication union (ITU) was put forward, it was known then as future public land Mobile communication System (FPLMTS), 1996 was renamed IMT - 2000 (International Mobile communications - 2000), which means that the System work in 2000MHz frequencies, the highest business rate can reach 2000kb/s, expected in around the year 2000 get commercial. Since 1997, due to the second generation mobile communication system of huge success, users of high-speed growth and limited system capacity and limited the contradiction between the business gradually obvious, the third generation mobile communication standardization work since 1997 enters the essence and stage.

classification

After detailed technical evaluation, analysis, and lots of coordination and fusion after work, in May 2000 itu-t R 2000 session (RA - 2000) approval, passed IMT - 2000 wireless interface specifications (RSPC) suggestion, it is divided into two types of CDMA and TDMA five technologies.

Three kinds of CDMA technology

Among them main technology for the following three CDMA technology:

1) IMT - 2000 CDMA - DS (IMT - 2000), namely direct spread-spectrum CDMA WCDMA. It is in a kuanda was directly to the frequency band signal spectrum,

2) IMT - 2000 CDMA - MC (IMT - 2000 Mc-cdma), namely cdma2000. This is the U.S. proposed technology, by multiple 1.25 M narrowband directly spread spectrum system consisting of a broadband system;

3) IMT - 2000 CDMA TDD (IMT - 2000 cream-and-green duplex CDMA) : currently, including td-scdma and UTRA TDD, including td-scdma is China's proposed technology.

Product introduction

In 1998, facing the world solicitation itu-t R IMT - 2000 candidate wireless transmission technology, in June, our country to itu-t R submitted td-scdma technology as a candidate. Later, in ChEG (China 3g assessment of this technique in coordinating) were evaluated, and in September 1998 to itu-t R submitted the appraisal report, the conclusion is the technique can completely satisfy the ITU proposed IMT - 2000 the minimum requirements. On November 5, 1999, in itu-t R TG8/1 last plenary session, td-scdma formal written by itu-t IMT - 2000 wireless interface specifications IMT. RSPC, in this year May 5th justafter the ITU - R 2000 session (RA - 2000), the proposal has been officially through, and will soon officially published and distributed.

CWTS for td-scdma technology more specific standardization work, at the same time carried out with UTRA TDD (TD - CDMA) multi-feature work. After nearly a year of hard study, discussion and lots of coordination, October 1999, the 3GPP accepted td-scdma as 3GPP TDD mode of low bit piece rate option, plan will td-scdma technology integrated into the 3GPP detailed specification of. Plan in June 2000 complete technical report at the end of 2000 edition done in td-scdma all the technical specifications.

As planned, in 2000, our country will finish td-scdma test prototype started field test, 2001 complete a formal prototype design and manufacturing, and put into production in 2002 around and operation.