Hangzhou Metro Wireless Network Coverage Design And Post Evaluation

As a kind of urban rail transit system,the subway is relatively special,with dense crowds,large traffic and data traffic.Improving the coverage of the subway network has a good publicity role for the communication operators.Because the subway environment is special,the macro base station cannot effective coverage requires the construction of an indoor communication system to meet the network needs of subway passengers.With the concept of co-construction and sharing,and the Ministry of Industry and Information Technology proposed to assess the co-construction and sharing,this puts higher requirements on how the communication operators can build high-quality indoor communication coverage systems on the basis of co-construction and sharing.main tasks as follows:Firstly,different indoor signal coverage schemes are adopted for different areas of the subway.The station hall of the subway station is covered by distributed base station,multi-system access platform and omnidirectional antenna coverage.The subway tunnel section uses distributed base stations and multiple systems.The access platfonn and the leaky cable network coverage method are covered.The overall construction scheme adopts a multi-input and multi-output dual-cable construction scheme,achieving more than 95%coverage and higher capacity requirements,and greatly reducing the cost.Secondly,it focuses on the interference problem of multi-band multi-system access between communication operators in the wireless coverage scheme of the subway,using the minimum coupling loss algorithm to calculate the minimum isolation required for inter-system interference,and secondly,calculating by the link budget method.The source transmit power is the farthest transmission distance of the leaky cable and the minimum power required at the end of the omnidirectional antenna,achieving the use of the least amount of equipment to effectively cover the subway signal.Finally,after the opening of the subway,the field test was used to verify the rationality of the design of the indoor signal distribution system in the subway,and a reasonable optimization plan for the unreasonable area output.The construction method of co-construction and sharing can not only effectively reduce resource waste and maintenance costs,but also solve the signal problems of the three operators at the same time,and enhance the word-of-mouth publicity of operators.