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Under the circumstances that people's awareness of environmental protection is increasing and the construction regulations of base stations are still not perfect, the most effective way to alleviate the site selection pressure of TD-SCDMA base stations is to improve the sharing rate of TD-SCDMA and GSM network base stations.
In the construction of the TD-SCDMA Phase I trial network, China Mobile has a considerable number of 2G base stations in 8 cities, but in the initial stage of the TD-SCDMA trial network, its site sharing rate is less than 20%. In Beijing, even if Beijing Mobile uses the 2G base station site that can be utilized, it can only meet the demand of about 30%, and 70% of the TD-SCDMA base stations must choose a new site. This is also the Beijing TD. - The main reason for the construction progress of the first phase of the SCDMA trial network has lagged behind other cities. Compared with Beijing's lower TD-SCDMA/GSM network base station sharing rate, the ratio of the total site of the TD-SCDMA Phase I trial network in Guangzhou and Shanghai is as high as 85%, comparable to the 3G/2G common site level in Hong Kong. In the second phase of the network construction, although the sharing rate of the TD-SDMA/GSM site has been improved, there is still potential to be tapped.
The TD-SCDMA/GSM network site includes shared equipment room, transmission, power supply, sky area resources and other supporting facilities. The sharing of the computer room to the existing GSM website address, because there are GSM network main equipment, switching power supply, transmission cabinet, vertical air conditioner, etc. in the equipment room, the new TD-SCDMA equipment must have a spare position in the co-located equipment room, and it is best. In the later network expansion, the location of the expansion cabinet is provided. Considering the space between devices, the extra free area required will be more. The sharing of the equipment room must also solve the problem of bearing capacity of the equipment room. Due to the deployment of the main equipment and the expansion of the power supply, especially the storage battery, the equipment room, especially the rented equipment room, is not required to be reinforced on the first floor. Due to the complicated situation of the roof of the machine room, the design of the civil building can not directly meet the requirements of the 3G engine room, and must be strengthened or modified. Transmission Sharing From the perspective of operability and ownership, the TD-SCDMA self-built transmission system is the best choice, but the shared transmission architecture can be considered. The power supply in the equipment room is mainly shared. If the capacity is sufficient, you can consider sharing directly. Otherwise, you should consider the expansion of the power supply. Generally, TD-SCDMA is responsible. Supporting sharing mainly involves air conditioning, mains introduction, fire protection, digital and optical distribution frames, etc., and sharing possibilities are very high. The sharing of towers mainly refers to the sharing of towers, floor towers, single-tube towers, and elevated towers. It is necessary to transform and calculate the existing towers to meet the unique engineering installation process requirements of the TD-SCDMA antenna feeder system. The surface is a scarce resource. For the case where the tower cannot be shared, such as masts, elevated racks, wiring towers, etc., it is possible to consider the sharing of the surface. At this time, it is necessary to consider the requirements for the isolation.
In the practice of TD-SCDMA/GSM network co-site, we can see that the difference in station spacing between TD-SCDMA network and GSM network is directly related to whether the two systems can achieve the common site. Due to the increasing capacity of the GSM network, the cell radius of the GSM network is further reduced, especially in urban and urban dense areas, the cell radius of the GSM network is smaller, so that the cell radius of the TD-SCDMA and GSM networks is very close, therefore, TD -SCDMA and GSM networks can achieve a higher proportion of co-site construction in densely populated areas. The above situation is in the TD-SCDMA network coverage period. When TD-SCDMA enters the expansion period, it needs to consider how to facilitate the expansion and operation and maintenance of the two. Otherwise, it will need to be converted into an independent network at a large cost. Therefore, for some high-traffic areas, such as dense urban areas, base station sharing can be used as a transitional strategy; but for some areas where service demand is not high, such as rural areas, base station sharing can be used as a long-term strategy.
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