TECHNOLOGY APPLICATION

SCDMA and Its Business Scope

The communication system allowing users to access to digital communication networks in wireless manner is a most rapidly developing system with the highest market potential, and it also supports most rapid networking and most convenient implementation. SCDMA wireless access technology differentiates in its high radio frequency utilization, proved communication security and relatively long communication distance in low transmission power, etc. contributing to its adoption of advanced SCDMA wireless access technology, thus becoming the preferred wireless access communication system.

SCDMA wireless access communication system was developed independently by China Potevio. It is a synchronous code division multiple access integrated wireless access communication system integrating smart antenna, software radio and other core technologies into one unit. Its basic service function includes wireless mobility (it can provide many terminal products such as portable mobile terminal and fixed terminal) and broadband data access, etc.

SCDMA, Synchronous Coding Division Multiple Access, is a cutting-edge innovation in wireless communication technology. The SCDMA business scopes include wireless city phone system of 1800MHz, the payphone system of 1800 MHz, SCDMA access system of 450MHZ, 1.8G/3.5G wideband data, VOD, Living video conference, distance education, telemedicine and controlling telecommunication. This solution is ideal for both urban radio access network and rural telecom services.

SCDMA System   

SCDMA wireless access system, working frequency of 400MHz and 1800MHz, adopts a series of international advanced technologies such as smart antenna, synchronous-CDMA, software radio and self-developed SWAP protocol. This system adopts macro-cellular connection mode with large coverage radius. It supports single networking, 1800MHz or 400MHz, and combination networking. As a cutting-edge digital wireless access system, it provides ideal solutions for public communication and rural communication.

The network structure of SCDMA wireless local mobility system is shown as follows. The main network elements include:

1.  Local Mobile Control Center (LMCC)
2.  Base Station Controller (BSC)
3.  Base station System (BS)
4.  Home Location Register (HLR)
5.  Short Message Center (SMC)
6.  User Terminal (UT)
7.  Operation Support System (OSS)

SCDMA Wireless Local Mobility System Network Structure

Application Scope   

The local mobility system that is constructed using the SCDMA wireless access equipment can provide flexible networking applications in all sizes and all coverage scopes.

Local mobility network based on single BSC Can support 1000-50,000 subscribers and the network coverage ranging from several square-kilometers to over 1000 square-kilometers.
Local mobility access network based on single LMCC and multiple BSCs Can support 100,000-1,000,000 subscribers and cover one medium-sized city or many small towns affiliated under the administration of one municipal area.

The large network system constructed on the base of PMCC and LMCC can meet the requirement of large network with a certain number of subscribers and in any coverage areas. If necessary, it can also provide roaming services.

The main application fields of the SCDMA integrated wireless access system include:

• Colorful screen Call barring service
• Public network carrier develops local telephony user access services in new areas, including wireless public pay phone services and local mobility services, etc.;
• Carrier develops data and voice mixed services in commerce flourishing areas;
• Construct special voice and data communication network in the private fields where public networks can’t cover such as oil fields, coal and mineral fields, etc.;
• Army and national security departments construct regional or nation-wide special and confidential communication networks;
• Construction of networks in the area where wire line telephone network is hard to build for complementing the coverage of public networks;
• Construction of networks in the areas where population is small for complementing the coverage of public networks;
• Emergency communications in urgent and special periods;
• Any temporary communication requirement, such as army training camps and construction sites, etc.