| With the telecom restructuring plan put into reality after the start of China Telecom China Unicom CDMA network operators the original. New business as a telecommunications growth, it is necessary to vigorously CDMA network construction to ensure that the network quality to enhance the rapid and vigorous development of various types of CDMA business. Should give full play to the technological superiority of CDMA networks, network optimization is a very important job of the technical aspect. Network optimization is a network that is running through the parameters collection, statistical data analysis, signal tracking, measuring the road information acquisition and analysis means to the entire communications network to make a comprehensive analysis to identify the impact of network quality reasons, through the adoption of the corresponding technical measures to adjust the parameters so that the entire network to achieve the best conditions, so that the limited resources can be efficiently utilized.Network optimization is an ongoing task, because of changes in the distribution of user groups, the changes in surface features (Such as: the new building, roads, vegetation, etc.),Change the network structure, technological progress, the interior distribution system electromagnetic environment changes, unforeseen factors such as require operators constantly running to optimize the network. Network at the initial stage because of the number of users less, has passed the road test required to optimize the general need to repeat this process several times. With the increase in the number of users through network maintenance record data centers to optimize the network. This job of continuous optimization of CDMA mobile communication system is particularly important because CDMA mobile communication systems are interference limited communication systems, with the increasing number of users, each user disruption is also increasing, and the external environment also change, so constantly required for certain network parameters to edit.From the network optimization technology development trend, it has been optimized relative to the refinement of the extensive changes in the network-centric to business-centric change from performance to the user perception changes, so the future work of network optimization model should be as follows: Based on the whole the idea of the whole network, based on the concept of client-aware, end-to-end planning and optimization.In this paper, the main contents of the study is to use XOS (user feel analysis) technology as the core of the data collection platform systems and data collection platforms set up a dedicated data collection links, will be boring, not as large as query CDL data summarized in intuitive mathematical model, combined with DT, CQT and statistical analysis and other traditional means of Changchun CDMA2000 1X system performance analysis, to solve some of the Net is a wireless network coverage problem.In this paper, the main job is as follows: First of all, this article on the evolution of CDMA2000 specific route and its key technologies of the system. CDMA2000 technology from the United States and South Korea are mainly to the standard IS-95CDMA manufacturers and operating company launched, it is evolved from CDMA One third generation mobile communication technology. CDMA2000 inherited the IS-95 narrow-band CDMA system technical characteristics, operators can in the narrow-band CDMA network to replace or increase the part of network equipment transition to 3G. Because of a CDMA2000-1X reverse coherent demodulation, fast forward to the Power Control, Transmit Diversity, Turbo coding and other new technology, its capacity than IS-95 greatly improved.Under the same conditions mandarin tone of business is concerned, roughly the capacity of IS-95 system twice. CDMA2000 1X are the most technologically sophisticated, the business of the fastest third-generation mobile communication technology. Technically, its cutting-edge research the most effective, but also so far the highest throughput of wireless technology standards.Secondly, this article on the network to optimize the specific processes and methods described in detail, at the same time give at the time of network optimization methods of work. Because CDMA network infrastructure during the process, there has been a relatively short construction period, the network characterized by frequent changes. Between the building apart from large-scale expansion, there are a lot of small-scale expansion, restructuring and upgrading works, works are usually left over after the more questions will need to solve network optimization. In practical work, to deal with network problems arise summarized, combined with field investigation, road test and analysis of the reasons for OMC Report, give in the actual optimization solution.And, combined with the actual situation, the first CDMA business of Changchun City area to conduct a detailed road test, while the use of XOS (user feel analysis) system testing software for CDMA network to conduct a comprehensive test and analysis, give the basis of model analysis of the problem, and according to This base station parameters to be adjusted to optimize the wireless subsystem.The second step, in accordance with the measured results give way to optimize the pre-Ec / Io, FER, Rx power, Tx power path mapping, and then measuring the results of correct specific quantitative analysis, that is, a practical test for each case and complaints from access to the reasons for failure of the reasons for dropped calls, switch failure causes and FER, etc., from a detailed analysis in theory and road test results analysis and found that pilot polluted areas, in view of major roads and the main coverage area of base station antenna to adjust programs to reduce pollution caused by pilot because of the wireless access failures and dropped calls situation. At the same time, new features algorithm (HASH algorithm) the opening of the load between the two carrier balanced, thereby reducing dropped calls.Step Three: Through the A + / MSC interface signaling support analysis, combined with the actual values of the parameters and the theoretical value of the contrast, adjust paging duration, timer settings and other parameters, so long Kyrgyzstan, a long four high-speed switch problem and sound recordings is not accurate enough to inform the player basically resolved the situation, so that network traffic volume has increased to some extent. The fourth step: According to Changchun City Optimize CDMA business district after the Ec / Io, FER, Rx power, Tx power, such as some important way to optimize the results of mapping and traffic dropped calls than the call set up success rate, wireless systems to connect rate trends, to optimize the requirements of the indicators before and after comparison, to determine the CDMA network optimization results of the basic requirements for achieving the targets, and optimize the task is completed.Finally, Changchun CDMA network system development of specific recommendations. After this optimization, Changchun CDMA network performance is greatly improved, has reached an optimal status. However, with the development of urban construction and changes in user groups and the changes in traffic and so on, resulting in the wireless coverage changes, the other system there is still a system of aging equipment, interference and other issues will lead to deterioration of system performance , which led to deterioration of the user feel a range of issues. Therefore, the daily inspection and optimization work is still not allowed to relax. |
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