CDMA technology standardization has gone through several stages. IS-95 standard series cdmaONE is the first release of the standards in the real world's widely used in the first CDMA standard is IS-95A, the standard encoding support for the 8K voice services. Were subsequently published a 13K voice encoder TSB74 standards, the CDMA PCS support for the 1.9GHz system STD-008 standard, in which encoding 13K voice quality of service has been very close to the wired telephone voice quality. With the mobile data business growth in demand, in February 1998, QUALCOMM Incorporated announced the IS-95B standards for CDMA-based platform. IS-95B will provide CDMA system performance and mobile users increase in the flow of data communications equipment to provide data services 64kbps. Later, cdma2000 become narrow-band CDMA system, the transition to third-generation systems. cdma2000 standards in the early stage of research, made 1X and 3X development strategy, but studies have shown that, 1X and 1X enhanced technology represents the future direction of development.
CDMA technology's standardization and promoting the application of technology in the world. At present, in the United States, South Korea, Japan and other countries, CDMA technology has been applied on a larger scale. In some European countries, some of the operators also set up a CDMA network. According to the CDG (the world's CDMA Development Group) statistics, CDMA subscribers by the end of 1996 was 1,000,000; to March 1998 has been the rapid growth to 10,000,000; As of September 1999, the number of users has more than 40,000,000. In early 2000, the world's CDMA mobile phone users has exceeded the total number of 50,000,000, a year in the number of users grew 118 percent. CDG said that Asia has become the CDMA market, the main engine of growth, Asia, the number of CDMA subscribers grew 88% from a year ago, reaching 28,000,000. The U.S. growth rate is as high as 143 percent, to 16,500,000, but the absolute number of users is lower than in Asia, the Asia-Pacific region, Hong Kong, China, Japan, South Korea, Australia, Thailand, India, the Philippines, New Zealand, Bangladesh and many other Countries and regions have established a CDMA commercial network, the number of users has more than 21,000,000. The third is located in the growth of Central and South America, CDMA subscribers reached 5,000,000. CDG has also said that from now on the global CDMA market, mainland China's largest area of growth potential, it is estimated that in 2003 the mainland Chinese market, the number of users who can be reached 40,000,000.
CDMA mobile communications technology development. In the 2G stage, CDMA and GSM Enhanced IS95A the technical system in the same generation of products, providing more or less the same business. However, CDMA technology has its own unique, good call quality, fewer dropped calls, low-level radiation, health and environmental protection have significant characteristics. In the 2.5G stage, CDMA2000 1X RTT and GPRS technology has been evident in the difference in the rate of transmission on 1X RTT higher than GPRS, carrying on business in the new 1X RTT mature than GPRS can offer more speed in the rate of new business . From 2.5G to 3G technologies on the transitional institutions, CDMA2000 1.X to CDMA20003.X than GPRS transition to a more smooth transition to WCDMA.
CDMA technology's standardization and promoting the application of technology in the world. At present, in the United States, South Korea, Japan and other countries, CDMA technology has been applied on a larger scale. In some European countries, some of the operators also set up a CDMA network. According to the CDG (the world's CDMA Development Group) statistics, CDMA subscribers by the end of 1996 was 1,000,000; to March 1998 has been the rapid growth to 10,000,000; As of September 1999, the number of users has more than 40,000,000. In early 2000, the world's CDMA mobile phone users has exceeded the total number of 50,000,000, a year in the number of users grew 118 percent. CDG said that Asia has become the CDMA market, the main engine of growth, Asia, the number of CDMA subscribers grew 88% from a year ago, reaching 28,000,000. The U.S. growth rate is as high as 143 percent, to 16,500,000, but the absolute number of users is lower than in Asia, the Asia-Pacific region, Hong Kong, China, Japan, South Korea, Australia, Thailand, India, the Philippines, New Zealand, Bangladesh and many other Countries and regions have established a CDMA commercial network, the number of users has more than 21,000,000. The third is located in the growth of Central and South America, CDMA subscribers reached 5,000,000. CDG has also said that from now on the global CDMA market, mainland China's largest area of growth potential, it is estimated that in 2003 the mainland Chinese market, the number of users who can be reached 40,000,000.
CDMA mobile communications technology development. In the 2G stage, CDMA and GSM Enhanced IS95A the technical system in the same generation of products, providing more or less the same business. However, CDMA technology has its own unique, good call quality, fewer dropped calls, low-level radiation, health and environmental protection have significant characteristics. In the 2.5G stage, CDMA2000 1X RTT and GPRS technology has been evident in the difference in the rate of transmission on 1X RTT higher than GPRS, carrying on business in the new 1X RTT mature than GPRS can offer more speed in the rate of new business . From 2.5G to 3G technologies on the transitional institutions, CDMA2000 1.X to CDMA20003.X than GPRS transition to a more smooth transition to WCDMA.
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