The CDMA system is a self-interference system that constitutes interference between the user and the user and between the same carrier frequency cells. At the same time, the cell has a breathing function. The higher the network load, the larger the interference and the smaller the coverage. On the contrary, the smaller the load, the smaller the interference and the wider the coverage. The coverage and capacity of the network are always changing. The capacity of the zone is a kind of soft capacity. Therefore, the network planning network based on CDMA technology is much more complicated than the network planning network based on GSM technology. It is not necessary to add several base stations to improve system performance. Therefore, power control is particularly important in CDMA networks. Through power control, the "far-and-far effect" is effectively solved. From another concept, the CDMA system itself is a power-controlled system, and the link performance and system capacity depend on the degree of control of the interference power. Therefore, interference analysis, power configuration and handover planning are necessary. However, due to various factors that are mutually constrained, they tend to move all over the body. Therefore, in the network planning optimization process, many characteristics need to be considered comprehensively. Wireless network optimization is divided into two phases. First, engineering optimization, that is, optimization during network construction, mainly in the initial stage of network construction and initial optimization after expansion, it pays attention to the overall performance of the whole network; second, operation and maintenance optimization is in The optimization of the network operation process, that is, daily optimization, through the integration of OMC, on-site testing, complaints and other aspects of information, comprehensive analysis and positioning of various problems and causes affecting network quality, focusing on local area troubleshooting and single station performance Improvement. 2.1 Engineering Optimization The purpose of engineering optimization is to expand the network coverage area, reduce call drop rate, reduce the call and call failure rate, provide stable handover, reduce unnecessary soft handover, improve system resource usage, expand system capacity, and satisfy RF. Test performance requirements, etc. The following are the main methods of engineering optimization. (1) RF data inspection. Mainly to verify the location of the base station, RF design parameters, antennas used, coverage maps, etc. Verify that the PN code settings are consistent with the design parameters, verify the neighbor relationship table of the system, and verify that other system parameters are consistent with the design. (2) Base station group division. The purpose of defining a base station group is to divide a large-scale network into several relatively independent areas, which is convenient for road test, resource allocation, road test time control, and network micro-study. Of course, it is also the current status of network implementation. The method for defining a base station group is generally as follows: the number of site addresses is 20 to 30, and the specific situation can be adjusted. If the scale is too large, the coverage area is too large, which will cause some inconvenience to data collection and data analysis. If the scale is too small, it will not be able to meet the relative independence of the coverage area, thus affecting the accuracy of the optimization; the coverage area will remain continuous (some station stations are far away, rural stations with relatively independent coverage areas should not be included), in addition to administrative The geographical division, such as the general medium-sized urban area and the adjacent suburban station, can be divided into one base station group. The optimization of the subsequent base station group should consider the interaction with the previously optimized base station group at the boundary. The selection of the base station group can predict the coverage through the combination of the electronic map and the planning software, and provide a basis for the division of the base station group. The actual division of the base station group complements its principles and complements each other. (3) Road test line selection. The determination of the road test route mainly considers the main roads in the urban area and the suburbs, and the grid is in the form of a grid, and covers the coverage of all base stations. The road test in the suburbs and rural areas is relatively simple, mainly to eliminate the uncovered areas when the results are analyzed. The actual selection and selection principles of the road test lines also complement each other and complement each other. (4) Road test. Air interface data is collected by a road test tool such as Agilent. (5) Road test data analysis. The background test software, such as AcTIx, analyzes the drive test data to clarify the cause of the problem. (6) For the analysis results, adjust the parameters, such as antenna azimuth, downtilt adjustment, PN code re-planning, neighbor list reconfiguration, search window size adjustment, etc. (7) Whether the adjusted result meets the target, such as call drop rate, turn-on rate, etc., if the satisfaction is completed, a round of optimization is completed. If it is not satisfied, the road test analysis is re-partitioned until the network performance index is met. 2.2 Operation and maintenance optimization The main goal of operation and maintenance optimization is to maintain good network performance indicators, single station troubleshooting and performance improvement, reduce pilot pollution, expand system capacity, and meet RF performance requirements. The flow chart of operation and maintenance optimization is shown in Figure 2. The premise of operation and maintenance optimization is to check the system data and confirm that the parameter configuration is consistent with the design. As can be seen from Figure 2, the operation and maintenance optimization mainly has 4 latitudes, background analysis, customer complaints, drive test and dial test. (1) Background analysis; background analysis is actually the daily OMC data collection, statistics of related indicators and possible alarm information of the base station. Through OMC data statistics, base stations/sectors with large traffic can be discharged with the worst performance 20 according to the following indicators (more or less depending on the area). Sectors/base stations: call failure rate, drop Call rate, blocking rate, and frame error rate. At the same time, for the base station/sector with low traffic volume, if the statistics for consecutive days indicate poor performance, it is also necessary to perform tracking and fault analysis and positioning. In addition, some base stations have alarms, such as hardware failure prompts to replace hardware or overload, etc., which is also an important part of background analysis. (2) Customer complaints; collect the customer's complaint information, understand the problem areas and possible problems, and solve them in a targeted manner. (3) Road test; through regular road test, find problems, such as interference, misconfiguration of neighboring relationship, etc., find concealed problems in time, and solve them as soon as possible. (4) CQT dial test (including user complaints to determine the location); to ensure the network performance of key areas by conducting test tests in some user-intensive areas, such as stations, hotels and scenic areas. Through the above 4-step process, comprehensively locate the problem area and cause, and propose a solution. 3, the conclusion The mobile communication system itself is a complex and large system. From this perspective, the optimization of the wireless network can only provide a satisfactory solution rather than an optimal solution. Therefore, the significance of network optimization is to maintain the network in a good operating state, and the evaluation of the optimization results is reflected by a series of network service indicators. Network optimization through the above methods is certainly not enough and not perfect. We need better updated technical support to make our network more quality. High efficient charging speed for Toshiba laptop, stable current outlet can offer power for the laptop at the same time charge the laptop battery. The best choice for your replacement adapter. We can meet your specific requirement of the products, like label design. The plug type is US/UK/AU/EU. The material of this product is PC+ABS. All condition of our product is 100% brand new.
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