Seriesofthethirdgenerationofmobilecommunication

When 3G (the third generation of mobile communication ) is developed like a raging fire , have a lot of GPRS , EDGE , cdma2000 to follow, WCDMA new technical term appears , general users only know that it relates to data transmission rate to get, but as for what is a future trend of a cell-phone , it seems to be still a piece of doubts and suspicions in the mind of everybody, following we open the answer to a riddle for everybody.
GSM series
GPRS: Data transmission is nearly 11 timesGPRS full name: It is the first step of network transition 3G of GSM (the third generation of mobile communication ) that GPRS that General Packet Radio Service is expected to quote extensively in 2000 is real. Can data transmission, speed of 9.6Kbps rise to per second speed of 115Kbps progressively from today, interflow and strive to make the swift opener demand to the data after meeting users. This wrist-watch telephone that Motorola produces in the picture, it was exactly fresh GPRS rule that makes that was adopted.
EDGE: Continue to use original GSM network
EDGE full name: Enhanced Data Rates for Global Evolution, as its name suggests, the appearance of EDGE, is it get network capacity and being fast than GPRS , data transmission there is 283Kbps totally to make. And according to GSM rule and general EDGE developed out frequently at present, the network provider only needs to make a little to change correspondingly in the software and hardware, can continue to use existing GSM system , go to support moving the multimedia service , totally accord with the idea of the low benefit with high costs. And can coexist with WCDMA rule in the future , its elastic place. EDGE is expected to come on stage formally in 2001.
WCDMA: 2Mbit per second
WCDMA full name: Wideband Code Division Multiple Access, by GSM network core multiply WCDMA at present, data transmission can reach per second 2Mbit (in the room ) and 384Kbps (move space ) extremely rapidly. Have behavior this , adopt wide-band network of 5MHz , quote with now 200kHz narrow GSM is compared frequently generally all, can understand in the future carrying on video conferencing , surfing the Net , listening to MP3 or make speech ,etc. when conveying through WCDMA rule, receive how it is have no time clearly, seem not to separate . Japan really does one's utmost in developing the WCDMA cell-phone. The finding is WCDMA concept telephone of the product of NTTDoCoMo in the picture.
CDMA series
CDMAOne: User 35 million CDMAOne full names: Code Division Multiple AccessOne is CDMA second generation, can reach cdmaOne of 1.25MHz , global users are close to 35 million at present, even Japan this kind is it use one's own country of rule join the ranks to insist on. The network of the low benefit with high costs develops, the selling point of CDMA technology. Because website base figure little, is it after receiving , can permit numerous user use at the same time to hinder from definitely. In Japan , can also offer the capacity of data of 64Kbps now , receives and dispatches E-mail, cell-phone financing and ＆#118alue-added service that telephone book tickets, second to GSM category at all.
CDMA2000: Support and move the multimedia service
CDMA2000 full name: Code Division Multiple Access2000, by the reason that GSM derives like WCDMA, cdma2000 changes in quality to evolve out from cdmaOne , support a kind of rule of 3G. The purpose is to guarantee to invest money in developing the network provider of CDMA, can carry out the transition to 3G process from cdmaOne simply and efficiently . Cdma2000 divided into two stages and evolved altogether, the first stage will offer the data transmission rate of 144Kbps per second, and when the data accelerate to 2Mbps per second and convey, it is the second issue. Then, like WCDMA being the same , will support and move the multimedia service, it is the final goal that CDMA develops 3G.