Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication

WCDMA base stations distributed around Taiwan synchronization and standby switchover Design and Implementation

Author WangShuang
Tutor LiYiBing
School Harbin Engineering University
Course Signal and Information Processing
Keywords Embedded memory database WCDMA distributed base station Taiwan before and after synchronization Synchronized standby Switchover
CLC TN929.533
Type Master's thesis
Year 2011
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In the wireless communication technology continues to integrated, small, modular direction of rapid development of today, distributed base station marked \flexible distribution capability, the overall response to communications industry trends. Current international most representative of the third generation mobile communication technology standards CDMA2000, TD-SCDMA and WCDMA, while compared with the other two 3G standards WCDMA has inherent market advantage, the higher the spreading gain, global roaming capability, etc. advantage, constitute WCDMA distributed base station become a research hotspot conditions. Embedded systems have been integrated into every corner of people's daily lives, the density of the main memory is also rising, while prices have been continuously reduced, the memory database built on top of the embedded system can well adapt to embedded system disk resources shortage situation, and can meet the requirements of efficient real-time embedded systems, this paper built on top of a base station via a distributed embedded memory database to solve the distributed base station after station data synchronization and standby switchover problems have practical significance. This article is from the following aspects: 1, in the embedded real-time operating system VxWorks above the introduction of the 3G base station software platform architecture. The software platform can maximize shielding hardware environment to support different business software applications, support for different embedded smooth switching between operating systems. 2, the design of the WCDMA base stations distributed embedded memory database functional components, aimed at the entire base station communication system to provide reliable data management and maintenance, including data interface for other applications to provide real-time and efficient front desk as well as a stable and reliable synchronization standby switchover function. The database system includes the following modules: system power module, front and synchronization module standby synchronization module, data archiving module, trigger module and a data interface module. This study focuses on the embedded memory database distributed base station in the WCDMA system to achieve real-time synchronization as well as front and back real-time synchronization with the master and slave switchover algorithm design and implementation. 3, in order to achieve WCDMA base stations around Taiwan distributed real-time synchronization of data, this paper in the background on the front and a plurality of single table field table field to operate on the different circumstances presented record-level synchronization, and table-level synchronization algorithm. Both algorithms are based on the primary and backup memory strategies presented, and the characteristics of these two algorithms take into account that the focus of parent-child relationship between constraints and exclusive table constraints prevent illegal data synchronization, the experiment proved that the two algorithms in real time and reliability is very good, and the algorithm other scenes before and after the operation of distributed base station communication system is also applicable. 4, in order to improve the reliability of the communication system, 11 AMB increasingly widespread application of the mechanism, WCDMA distributed base station also uses this mechanism, so the primary and standby switchover to become synchronized with the communication system stability is another key. Switchover process includes primary and backup synchronization. The proposed algorithm is different from the conventional master-slave switchover algorithms have been proposed: on the one hand, the algorithm does not depend on the base station hardware, but from the perspective of the software implementation, portability, and greatly reduces the hardware overhead; another respect, this algorithm has been proposed software standby switchover algorithm, there are fundamental differences and advantages, it broke through the First Lord of the inverted backup, backup pour master switchover practices to avoid double-ready condition, and the data synchronization large amounts of data in advance, greatly reducing the switchover time overhead. And this paper proposed algorithm is applied to dual-standby switchover base station communication systems, and multi-mode base station prospects consistent.

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