GSM experience for TD-SCDMA Network Optimization

At present, the new development trend of China's communications industry has brought the importance of network regulation and network optimization to the fore. On the one hand, the rapid development of wireless transmission technology, the future of 3G, especially the scale of TD-SCDMA, requires the network specification network optimization technology must keep pace with the times; on the other hand, the restructuring of China's telecommunications industry, operators must evaluate, plan, and operate the new receiving network, while network regulation and network optimization are necessary measures. Driven by double factors, the technology, tools, and methods of network regulation and network optimization will enter a new development period. Therefore, this edition focuses on network regulation and network optimization under the new situation.

At present, after a long period of operation, network planning and optimization, China's GSM has a very good network condition, and the user scale has ranked first in the world, the operator has more than 10 years of experience in GSM network operation and optimization. Compared with GSM, TD-SCDMA (hereinafter referred to as TD) network construction time is short, the increasing number of users and network expansion, will bring many challenges to the network optimization. Network optimization includes coverage optimization, interference control, and business optimization. If you can accurately grasp the similarities and differences between GSM and TD network optimization and learn from the successful experience of GSM optimization, operators can build high-quality TD networks in the shortest time.

Coverage optimization and Interference Control

There are many similarities and differences between GSM network and TD network in coverage optimization and Interference control.

The standard for measuring network coverage of GSM network and TD network is very similar, and coverage is measured by signal strength and load-to-load ratio. Li Xin, Project Manager of the Wireless Technology Research Institute of China Mobile Communication Co., Ltd., said that many coverage optimization experiences of GSM networks can be used for TD networks. Adjusting antenna engineering parameters is the most common and effective optimization method, parameter Adjustment and neighboring area optimization can be used as auxiliary means. At the same time, the causes and positioning methods of GSM and TD network interference are also the same.

The similarities between TD and GSM network optimization include single-site optimization, RF optimization, and business optimization. The difference is that the optimization of GSM network is from single-site optimization to global optimization, the Optimization of the TD network is from single-site optimization to cluster optimization, and then to global optimization, there is a slight difference in the Optimization content in each phase.

The coverage Optimization of TD networks faces many challenges. The breathing effect of the TD System and the diversity of TD services make it more difficult to optimize the network. In addition, in terms of channel power setting, pilot pollution control, out-of-step control, and inter-code interference control, we need to study new Optimization Methods for TD networks. Compared with the GSM system, the channel setting power of the TD system is more flexible. We can flexibly adjust the power according to the traffic needs. The pilot contamination is not available in the GSM system. We can solve the pilot contamination problem of TD signals by means of antenna adjustment, wireless parameter adjustment, and near-frequency point optimization. The TD system is a synchronization system, which may cause some out-of-step interference when out-of-step occurs. The main manifestation is the interference intensity and time slot.

Similarities and differences between business Optimization

Business optimization is another important part of TD optimization. TD and GSM share many similarities in the definition of basic indicators, causes of deterioration of basic indicators, analysis processes and optimization methods of basic indicators; in terms of service types and business signaling processes, the TD system has many characteristics different from those of GSM.

The basic indicators of TD and GSM are similar, including wireless voice connection rate, disconnection rate, and switching success rate. The reasons for the deterioration of the two basic indicators are similar, such as device, antenna feed and transmission faults, coverage problems, interference problems, and switching problems. In terms of the analysis process and optimization of basic indicators, the optimization work of both is from the integrity of multiple cells to the performance of a single cell, from key indicators to relevant secondary indicators gradually refined. For example, in the GSM network, the user complained about a high disconnection rate, and the cell disconnection indicator suddenly deteriorated. The number of dropped calls increased from three times to more than 100 times during busy hours. This disconnection is caused by interference with the carrier frequency. This judgment can be promoted to the TD network.

The optimization of TD network has some characteristics different from that of GSM, which should be paid more attention. In addition to focusing on voice services, TD also needs to focus on the quality of data services and videophone services, mainly including average data rate and Data Service retention rate. In addition, the signaling processes of various new services supported by the TD network are slightly different from those supported by the GSM network. After the scale deployment of TD, the optimization methods of GSM service congestion and signaling congestion are available for TD's reference.

Li Xin said that the GSM network has a lot of experience in network optimization which can be used for reference by TD networks. At the same time, we need to clearly understand that because TD uses the multi-access method of TDMA and CDMA, and also uses technologies such as TD synchronization, the TD system is more complex than GSM in terms of coverage optimization, interference control, and multi-service optimization. With the help of successful GSM network optimization experience, we have found a set of Optimization Methods for the TD network. The large-scale commercial use of the TD network is just around the corner.

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