Study On CDL Application In CDMA Network Optimization

A Mobile Communication Network includes switching transmission systems and wireless base station systems, which constitutes a complicated communication system due to many uncertainties in the air. Therefore, conventional network optimization generally means optimization of wireless base stations which play a critical role in the network system and determine the performance of the mobile communication network.Network optimization is continuous and reasonable adjustment in planning and design of the network in accordance with certain rules on the basis of the current network to improve operating liability, reduce operating costs, improve system performance to maximize service quality available under existing system configurations, including more efficient resource utilization, best coverage, satisfactory signal strength, best voice quality and lowest call drop rate.Conventional network optimization generally applies such testing methods as DT/CQT which has the following drawbacks: (1) Inability to conduct effective real-time monitoring on the entire network; (2) Problems identified may not be representative as only a small fraction of hundred thousands of or millions of calls during a period of time is analyzed; (3) Field testing is geographically limited, which can be done only to some plane routes. Comprehensive three-dimensional testing is not available. Testing is not even allowed in some areas; (4) Extremely high costs of labor and time; (5) Problem solving is usually time-consuming and low efficient. Network optimization is an important and continuous process with heavy tasks and tight schedule; therefore conventional optimization methods are obviously not efficient enough. A number of equipment manufacturers have been conducting trial and research work, recording calls of each user with more powerful equipment, such as Motorola's CDL, Lucent's PCMD and Nortel's SBSLOG. Such records indicate key events during user calls, taking good advantage of which can be very helpful to network optimization.This paper covers analysis of all call records of users in the entire CDMA network and how to maintain, monitor and optimize the network with such mass data. As CDL has just been studied for a short time by researchers home and abroad, there are few commercial products in the market and no proven techniques and solutions in China. Relevant theoretical analysis and practices have been done for this study, based on which a feasibility proposal and a solution for system implementation are defined.