What is WCDMA network

WCDMA is the English abbreviation of wideband Code Division multiple Access (wideband Code Division multiplex), which is a third generation wireless communication technology. W-cdmawideband CDMA is a third generation mobile communication system, which is developed by 3GPP, based on the GSM map core network and Utran (UMTS terrestrial Wireless access network) as the wireless interface. Currently, WCDMA has releases 99, 4, Release 5, version 6, and so on. At present, China Unicom adopts this kind of 3G communication standard.

W-CDMA (wideband Code Division Multiple Access) is an ITU (International Telecommunication Union) standard, which evolved from code-wide Code Division multiple Access (CDMA), an official view of the direct expansion of the IMT-2000, compared with the technology commonly provided in the market today, It provides a higher data rate for mobile and handheld wireless devices. WCDMA uses direct sequence spread spectrum code Division multiple Access (DS-CDMA), Frequency Division Duplex (FDD) mode, the chip rate is 3.84MCPS, the carrier bandwidth is 5MHz. Based on release 99/release 4, it is available in 5MHz bandwidth, Provides the highest 384kbps user data transfer rate. W-CDMA can support voice, image, data, and video communications between mobile/portable devices at speeds up to 2mb/s (for local area networks) or 384kb/s (for broadband networks). The input signal is digitized first and then transmitted in a wide spectrum range in coded spread spectrum mode. Narrowband CDMA uses a 200KHz-width carrier, while W-CDMA uses a 5MHz-width carrier frequency.

W-CDMA is developed by ETSI NTT DoCoMo as a wireless interface for their 3G network Foma. Later Nttdocomo submitted to the ITU a detailed specification as a candidate for an international 3G standard like IMT-2000. The International Telecommunication Union (ITU) eventually accepted W-CDMA as part of the 3G standard for the IMT-2000 family. Later, W-CDMA was selected as the wireless interface for UMTS, as a 3G technology or scheme to inherit GSM. Misunderstanding Although the name is very similar to CDMA, but W-CDMA is not related to CDMA. Much of the small depends on the standpoint of different people. In the field of mobile telephony, the term CDMA can be used to refer to Code Division multiple access spread-spectrum multiplexing (QUALCOMM), or it can refer to the CDMA standard families developed by the United States including Is-95/cdma1x and CDMA2000 (IS-2000).

About mobile phone WDCMA, of course, WCDMA is not necessarily not the use of Unicom 3G, Unicom 2G card can also be used, mobile 2G card can also be used. Because the vast majority of so-called 3G mobile phones are dual-mode, that is, support both 3G and GSM. Another 3G card can also be used on the 2G phone. The difference is that some value-added services can not enjoy, such as Internet speed, video calls and so on. As for the call is the same.