TD-SCDMA Channel Distribution And Structure Simulation Study Network

TD-SCDMA is proposed a TDD standard by China, and called the three mainstream 3G standards with WCDMA and CDMA2000. Many relevant policies have been issued to support TD-SCDMA technology research and commercial development by the Government and the Ministry of Industry.TD-SCDMA standard uses many new technologies such as synchronous CDMA, Smart Antennas, Joint Detection, dynamic channel allocation; also has some common techniques, such as UTRAN network architecture. Compared to WCDMA and CDMA2000, TD-SCDMA has better flexible spectrum, higher spectral efficiency and greater system capacity. With the evolution of 3G technology, mobile communication system continuing to pursue the spectral utilization and system capacity as the upper limit is the hot research.Based on above considerations, this paper studies Channel Allocation technology and UTRAN network architecture and signaling in TD-SCDMA mobile communication system. The part of Channel Allocation mainly analyses and studies dynamic channel allocation (DCA) techniques and system code distribution technology, implemented slots priority queuing algorithm of S- DCA under the control of power and two algorithms of F-DCA which are movable boundary strategy and resource reservation strategy using the programming; The software of system code distribution implement the algorithm of synchronous code, spreading code, scrambling code and the pulse shaping. This paper analyses the signaling exchange and data transmission process among systematic interfaces of user equipment (UE), UTRAN and core network (CN); realizes the establishment of RRC, Direct Transfer (NAS signaling), RAB by simulation; implements the performance of downlink synchronization code, the basic intermediate code and PCCPCH transmission channel of business in the wireless transmission environment of cell search by simulation; finally implements the transition and business transfer process to establish communications between the caller and the called UE in idle and connected mode in UTRAN network architecture of TD-SCDMA.This article based on discussing the principles of the various parts of the structure realizes the function of the algorithm; analyzes and compares the result, visualization examples. It is a certain reference value for radio resources management of TD-SCDMA standard and 3G software Developers.