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3G, called the 3rd Generation, Chinese meaning refers to the third generation of digital communications . Relative to the first generation of analogue phones (1G) and second-generation GSM , TDMA digital mobile phone ( 2G ) , the International Telecommunication Union (ITU) , the current total determine the four global standard , they are WCDMA, CDMA2000 and TD-SCDMA and WiMAX . Time Division-Synchronous CodeDivision MultipleAccess, time division synchronous code division multiple access technology , abbreviated as TD -SCDMA is the ITU official release of the third generation mobile communications space interface technical specifications one of the TD-SCDMA standard proposed by China , widely accepted and recognized by the international wireless communication with international standards. TD-SCDMA is a set of TDD, CDMA, FDMA, SDMA multiple access technology in one communication system . The core network is based on the evolution of the GSM / GPRS network , and maintain compatibility with them . Wireless network using time division duplex ( TDD ) , smart antennas , uplink synchronization , multi- user detection , dynamic channel allocation , such as new technology , its interference is greatly reduced , improving the system capacity , reduce the cost of transmitting power and wireless base station . A communication network is not outstanding , the expected design goals can not be completed , largely depends on the wireless network planning is reasonable . This paper focuses on the TD-SCDMA wireless network planning , first introduces the basic principles of the TD-SCDMA and its key technologies , and then describes the planning process of the TD-SCDMA , then choose from the propagation model , size estimation , network reconnaissance detailed study of the planning and design of the TD-SCDMA method . Characteristics of TD-SCDMA network , TD-SCDMA network optimization method in practical engineering , the last with cases to illustrate .
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