TAILIEUCHUNG - W­CDMA technology  and FOMA installation plan

Principle of CDMA - Frequency allocation - Principle of DS­CDMA - Transmit power control Basic W­CDMA Transmission Technologies - Two­layer spreading code assignment - Inter­BS asynchronous mode Characteristics of W­CDMA - Statistical Multiplexing effect - MS stand­by time - Coherent RAKE reception (RAKE time diversity) 3G Roll Out Plan - FOMA service content - 3G Roll out plan | W-CDMA technology and FOMA installation plan 3rd September, 2002 Network planning Dept. NTT DoCoMo Today’s Items Principle of CDMA - Frequency allocation - Principle of DS-CDMA - Transmit power control Basic W-CDMA Transmission Technologies - Two-layer spreading code assignment - Inter-BS asynchronous mode Characteristics of W-CDMA - Statistical Multiplexing effect - MS stand-by time - Coherent RAKE reception (RAKE time diversity) 3G Roll Out Plan - FOMA service content - 3G Roll out plan Today’s Items are as follows. From now on, let me introduce the basic technical term of CDMA especially in RAN(radio access network). First of all I’m gonna talk about “Principle of CDMA”, After that, “Basic W-CDMA Transmission Technology”, “Characteristics of W-CDMA”. At last, DoCoMo had started the commercial service of W-CDMA from October 2001. Service name is FOMA(abbreviation of Freedom of Multimedia Access). So I gonna introduce our ”3G Roll out plan”. In case of 3 cell repetition Frequency Allocation f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f1 f2 f2 f3 f1 f1 f3 f2 f1 f3 f1 f3 f2 f2 f1 f3 f3 f2 f3 f2 FDMA / TDMA CDMA Same frequency in all area. Take care of frequency allocation. At first let me talk about the typical radio access system. One is FDMA; frequency division multiple access system. Second is TDMA; time division multiple access method In cellular system, high efficiency of frequency reuse is the most important thing. So, adopting FDMA and TDMA into cellular system, Network designer should allocate frequency not to give interference to each other, and have to continue to manage the frequency allocation in the future. Last one is CDMA; code division multiple access method CDMA is different from FDMA and TDMA . Users are distinguished by code which is assigned by the system. The same frequency carrier can be used in all cells in CDMA. So, network designer don’t have to care about frequency allocation of frequency reuse. Principal .

• Kĩ thuật Viễn thông
• W­CDMA technology
• FOMA installation plan
• W­CDMA
• Principle of CDMA
• Frequency allocation
• Transmit power control
• IP Ran
• Mobile network evolution
• Introduction of IP
• 3G WCDMA RAN
• Technology trend
• 3G HSPA deployment