TD-SCDMA is China's third-generation mobile communication standard. Compared with Telecom's CDMA2000 and China Unicom's WCDMA, mobile TD-SCDMA is one of the three 3G standards that started late. The advantage of TD-SCDMA is to obtain government Supported China's own 3G network; CDMA2000's advantage is low construction cost, directly upgrade from the previous CDMA1X to 3G; WCDMA's advantage is higher spreading gain, relatively large development space, mature technology, and strong global roaming ability . TD-SCDMA network optimization has become an important direction of TD-SCDMA network operation. With the continuous optimization of communication technology, people have higher and higher requirements on the quality of network services. I hope that TD-SCDMA networks can serve them everywhere and can enjoy the convenience brought by the network, so we have to Constantly optimize the communication network and continuously solve the problem of TD-SCDMA network coverage, so as to better let people feel the service and convenience that TD-SCDMA network coverage brings to everyone.
1. The concept of communication network optimization
Communication network optimization mainly refers to improving the signal performance changes between the mobile phone and the base station in the environmental interface. The communication network is a constantly changing network. The environment used by the communication network, the overall structure layout, the distribution of users, and the continuous improvement of network technology and other factors Uncertainty, the main purpose of communication network optimization is to adjust the base station parameters and network structure to improve the originally poor network conditions; network engineering optimization refers to the staged optimization of the newly constructed network, network operation Dimensional optimization refers to the optimization of the network after the completion of the network project to improve the quality of the communication network.
Second, the process of communication network optimization
Communication network optimization is a system engineering that runs through the entire process of network development. Its purpose is mainly to improve the environment of system software and hardware. Communication network optimization is mainly to adjust the various parameters of the project, performance parameters and resource configuration, so that the entire network can meet the target requirements, but because the network technology, environment, users and other factors are constantly changing, the corresponding target requirements are also changing Yes, so communication network optimization is a continuous long-term work process. The optimization of communication network is divided into the following steps in addition to rational division of labor, formulation of an efficient organizational structure, and preparation.
(1) Investigate the network status. First of all, collect the data representing the overall operation and engineering conditions of the current network status, and then analyze and compare to find out the objects that need to be optimized to prepare for the collection of richer data and more in-depth analysis. (2) Collect data. The content of communication network optimization data collection can be divided into two major categories: "network test data"; "system data". Various test methods or devices can be used to detect the performance and quality of the targeted multi-network. (3) Formulate optimization plans. Research and analyze the collected network test data and system data, and then combine with the current network operation and engineering conditions to formulate a reasonable optimization plan for this. (4) Test and implement optimization programs. Carry out specific tests on the formulated optimization plan, make adjustments in time if there are any improper places, and then test again, and constantly adjust and update, so that the quality of the communication network is really improved and maintain the best operating state. Figure 1 is a schematic diagram of the optimization workflow of the communication network.
3. Introduction of TD-SCDMA network
TD-SCDMA network is more suitable for providing dense voice, data and multimedia services in the densely populated areas of cities. The TD-SCDMA system has unique advantages in terms of utilization rate, flexibility, and diversity of service support. The channel characteristics of the TD-SCDMA system's uplink and downlink are basically the same, and the base station can estimate the uplink and narrow based on the received signal. TD-SCDMA also has the advantage of using smart antennas, which can reduce interference and improve utilization. It can also set the ratio of upstream and downstream time slots, adjust the upstream and downstream data rates, and is more suitable for occasions where the ratio of upstream and downstream data for Internet services is different, but this also adds complexity to the same-frequency networking.
4. Research on TD-SCDMA network coverage
(1) TD-SCDMA wireless network coverage plan: The wireless access network is an important part of the TD-SCDMA network system, which covers a large number of key technologies. The wireless access network system consists of base station equipment and wireless network management center , Wireless controller equipment and other three parts. There are two solutions for TD-SCDMA wireless network coverage. Because TD-SCDMA network planning cannot independently build a large-scale network in the early stage, you can choose to mix with GSM to establish a small-scale network; TD-SCDMA network can provide users with reliable and high-speed TD-SCDMA network users are also increasing, it will replace the GSM network in the future, and will also become an independent communication network. The process of evolving from a hybrid network to an independent network can be achieved by means of capacity expansion. As shown in Figure 2 and Figure 3, respectively, a hybrid network and independent network wireless network coverage plan.
(2) TD-SCDMA wireless network coverage solution in large and medium-sized urban areas The voice call service density in large and medium-sized urban areas is relatively high. Curved narrow streets, dense tall buildings and indoor depth make the wireless propagation environment complicated and require data The business is relatively large, the website resources are tight, the corresponding supporting facilities cost is relatively high, and the factors of capacity demand must also be considered. In the area coverage, to ensure the continuity of the UE when doing business, reduce call drops, and improve the service quality of the network, it is necessary to ensure that there is no coverage blind spot between the base station and the base station. When adjusting the leeway, we should consider adjusting the parameters of the reselection and handover algorithm threshold, lag timer and other parameters to control the cell coverage and handover band, so as to ensure normal signal coverage.
(3) Solution one: For dense areas with large demand for data services, it is more suitable for indoor macro base stations. The indoor macro base stations have large capacity, support 1 to 9 carriers, and are flexible in configuration, easy to expand smoothly, and have Sectorized smart antennas and equipment are relatively stable; for the situation where the site resources are relatively tight and stations need to be built quickly, you can use smart base stations that are small and compact, support wall-mounting, and can be used in indoor and outdoor compact base stations, or use no computer room, Low cost, fast network deployment, outdoor macro base station with remote management and unattended environmental monitoring system. Because the scale of TD-SCDMA network construction is relatively large, the workload is gradually increasing, and human resources cannot keep up with the expansion of the business, so the automation system has greatly helped it. Option 2: For hotspot areas with rich fiber resources, you can use the RF remote subsystem that supports smart antennas to continuously cover this, because its remote extension method is more flexible, and the system capacity is super large, which can effectively reduce the construction site. The quantity greatly reduces the cost per channel.
(4) TD-SCDMA network indoor coverage TD-SCDMA system uses optical fiber to transmit the signal to every corner of the building that needs to be covered to realize its multi-channel indoor coverage scheme. This solution usually uses optical fiber and coaxial cable in combination to ensure the coverage quality of the indoor network. Its advantages are: the multi-channel space separation of the RRU of the TD-SCDMA system, which can isolate the signal interference; the centralized placement of the TD-SCDMA baseband can enable the capacity sharing between each baseband; the use of optical fiber for indoor coverage, the RRU The equipment is placed nearby, which can reduce the loss and get rid of the burden of the dry-release system on the system. The space isolation algorithm can also effectively reduce the interference of users, so that the coverage of the network signal achieves good results.
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