wcdma is a 3G network. WCDMA is the 3G network communication standard adopted by China Unicom. It is a third-generation mobile communication system specifically formulated by 3GPP and based on the GSM MAP core network and UTRAN as the wireless interface. WCDMA uses direct sequence spread spectrum code division multiple access and frequency division duplexing to support voice, image, data and video communications between mobile/handheld devices at a rate of up to 2Mb/s (for LAN) or 384Kb /s (for broadband networks).
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
wcdma is the 3G network communication standard adopted by China Unicom.
WCDMA (Wide band Code Division Multiple Access) is a 3G cellular network.
Part of the protocols used by WCDMA are consistent with the 2G GSM standard. Specifically, WCDMA is a broadband spread spectrum 3G mobile communication air interface that utilizes code division multiple access (or CDMA universal multiplexing technology, not the CDMA standard) method. Broadband spread spectrum 3G mobile communication air interface using multiple access multiplexing (or CDMA universal multiplexing technology, not referring to the CDMA standard) method.
W-CDMA is a third-generation mobile communication system specifically formulated by 3GPP, based on the GSM MAP core network, and UTRAN (UMTS Terrestrial Radio Access Network) as the wireless interface. Currently, WCDMA has Release 99, Release 4, Release 5, Release 6 and other versions. W-CDMA (Wideband Code Division Multiple Access) is an ITU (International Telecommunications Union) standard. It evolved from Code Division Multiple Access (CDMA) and is officially considered a direct extension of IMT-2000. It is in line with the current market It provides higher data rates for mobile and handheld wireless devices than commonly available technologies. WCDMA uses direct sequence spread spectrum code division multiple access (DS-CDMA) and frequency division duplex (FDD). The chip rate is 3.84Mcps and the carrier bandwidth is 5MHz. Based on Release 99/Release 4 version, it can operate in a bandwidth of 5MHz Within, providing user data transfer rates up to 384kbps. W-CDMA can support voice, image, data and video communications between mobile/handheld devices at a rate of up to 2Mb/s (for local area networks) or 384Kb/s (for broadband networks). The input signal is digitized and then transmitted in a coded spread spectrum pattern over a wide frequency spectrum. Narrowband CDMA uses a carrier frequency with a width of 200KHz, while W-CDMA uses a carrier frequency with a width of 5MHz.
Feature Summary
W-CDMA was developed by ETSI NTT DoCoMo as a wireless interface for their 3G network FOMA. Later NTT Docomo submitted a detailed specification to the ITU as a candidate international 3G standard like IMT-2000. The International Telecommunications Union (ITU) finally accepted W-CDMA as part of the IMT-2000 family of 3G standards. Later, W-CDMA was selected as the wireless interface of UMTS as the 3G technology or solution that inherits GSM. Misunderstanding Although the name is very similar to CDMA. In the field of mobile phones, the term CDMA can refer to code division multiple access spread spectrum multiplexing technology, or to the CDMA standard family including IS-95/CDMA1X and CDMA2000 (IS-2000) developed by Qualcomm in the United States.
WCDMA and CDMA differences
The CDMA multiplexing technology has been around for a long time before Qualcomm used it for the IS-95 protocol, however this protocol is widely It is called CDMA because it has the principle characteristic of sharing multiple connections through the same frequency band like the CDMA multiplexing method, to distinguish it from other multiplexing schemes (such as GSM's TDMA). W-CDMA also uses CDMA multiplexing technology and is very similar to Qualcomm's standard. But W-CDMA is more than just a multiplexing standard. It is a complete set of specifications that defines in detail how mobile phones communicate with base stations, how signals are modulated, how data frames are constructed, etc.
1. Although the name is very similar to CDMA, W-CDMA has little to do with CDMA. How big or small depends on different people's standpoints.
2. In the field of mobile phones, the term CDMA can refer to code division multiple access spread spectrum multiplexing technology.
3. The CDMA multiplexing technology has been around for a long time before Qualcomm used it for the IS-95 protocol. However, this protocol is widely called ""CDMA"" because it has features like CDMA multiplexing. This method shares the principle characteristics of multiple connections through the same frequency band to distinguish it from other multiplexing schemes (such as GSM's TDMA).
4. W-CDMA is a complete set of specifications that defines in detail how mobile phones communicate with base stations, how signals are modulated, and how data frames are constructed.
Introduction to the application of 3G services in different industries:
1. Government emergency communication - government emergency communication network based on 3G/WCDMA
The government emergency communication service is a 3G service based on the WCDMA network and through the construction of a government emergency communication platform to realize government emergency command and dispatch, video conferencing, real-time monitoring, mobile office and other functions. The advantage of the business lies in the high-speed data transmission performance of the WCDMA network, which allows users to hold video conferences and transmit videos through 3G mobile phones anytime and anywhere to meet the government's emergency communication needs.
Compared with the 2G era, the government emergency response service based on WCDMA network can not only realize command and dispatch, conference call, mobile office and other functions, but also can be extended to M2M video transmission, point-to-point video calls, etc., which has greatly improved improve the government's ability and efficiency in handling emergencies.
2. Financial wireless - financial informatization solution based on 3G/WCDMA network
The financial wireless service is a 3G service based on the WCDMA network that realizes functions such as wireless branch deployment, real-time monitoring, and mobile office through secure connection with the bank's internal system. The advantage of the business lies in the security and high-speed data transmission performance of the WCDMA network, which allows the bank to infinitely expand the service space, improve the security monitoring network, and improve service quality.
Compared with the 2G era, financial wireless services based on WCDMA networks can make full use of the space brought by bandwidth expansion to realize wireless ATM (including video surveillance), mobile office, business forwarding and other functions, improving bank work efficiency and service quality, thus greatly improving the bank's image.
3. 3G Police Service - Police mobile law enforcement network based on 3G/WCDMA
3G Police Service is based on the WCDMA network and is directly connected to the police platform through the WCDMA network , a 3G industry application platform that implements various police mobile law enforcement functions, can meet the needs of the public security department for real-time inquiry, accident handling and reporting, accident scene monitoring, police command and dispatch, on-site law enforcement, video conferencing, mobile office, etc. The advantage of the business lies in the high-speed data transmission performance of the WCDMA network, which can meet the needs of high-speed wireless transmission of data and video.
Compared with the 2G era, the 3G police communication service based on WCDMA network can not only realize functions such as command and dispatch, telephone conferencing, and mobile law enforcement, but also can be extended to M2M video transmission, point-to-point video calls, etc., which is a great Expanded police law enforcement capabilities and improved work efficiency.
4. Wireless technical supervision - special equipment technical supervision network based on 3G/WCDMA
The wireless technical supervision business is based on the WCDMA network, through the safe direct connection between the WCDMA system and the special equipment technical supervision platform. It is a 3G service that realizes the real-time upload function of large-capacity data such as technical supervision information and video images. The advantage of the business lies in the high-speed data transmission performance of the WCDMA network, which allows law enforcement officers to collect, report and query special equipment information through 3G mobile phones anytime and anywhere.
Compared with the 2G era, wireless technical supervision services based on WCDMA networks can use the powerful wireless data transmission capabilities of 3G to transmit large-capacity data, and can be extended to M2M video transmission, point-to-point video calls, mobile office, etc. It has greatly improved the informatization level and work efficiency of technical supervision work.
5. Haiphong Wireless Post - Coastal Defense Video Surveillance System Based on 3G/WCDMA
The Haiphong Wireless Post business is based on the WCDMA network. Through the construction of a 3G wireless coastal defense video surveillance platform, it can realize key coastal surveillance A 3G service with real-time location monitoring function. The advantage of the business lies in the high-speed data transmission performance of the WCDMA network, which can meet the real-time video collection needs of any location covered by China Unicom's 3G network and solve the problem of difficulty in selecting points for real-time monitoring by government coastal defense departments.
Compared with the 2G era, in addition to realizing the real-time monitoring of each monitoring point by the monitoring center, the Haiphong wireless post service based on the WCDMA network can also be extended to the mobile phone to realize real-time monitoring of each video collection point through a 3G mobile phone. Functions such as video surveillance have greatly improved office efficiency and monitoring capabilities.
6. 3G Passepartout - a highway mobile law enforcement system based on 3G/WCDMA
3G Passepartout business is based on the WCDMA network, and securely communicates with the highway bureau data center through the WCDMA network. It is a 3G service that realizes functions such as mobile highway law enforcement, mobile office, and road administration supervision. The advantage of the business lies in the high-speed data transmission performance of the WCDMA network, which allows users to query and report law enforcement information, transmit videos, etc. through 3G mobile phones anytime and anywhere, meeting the needs of highway wireless data transmission.
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