Mobile communication 3G/4G (third generation/fourth generation) electric wave propagation loss NPL (noise-pollution level) model under shade of street trees and network optimization method

Abstract

The invention discloses a mobile communication 3G / 4G (third generation / fourth generation) electric wave propagation loss NPL (noise-pollution level) model under the shade of street trees and a network optimization method; the mobile communication 3G / 4G electric wave propagation loss NPL model under the shade of the street trees comprises four types of street trees, the first, second and third types of street trees are thick with leaves, and can greatly absorb energy of electric waves; the fourth type of street tree is thin with leaves, about 5 m in height and about 5 years old, and can absorb less energy of electric waves; the invention further relates to a network optimization method of the mobile communication 3G / 4G electric wave propagation loss NPL model under the shade of the street trees, comprising the following steps: (1) setting a base station distance, wherein a base station is inappropriate to close to the street trees, an incident angle can be controlled between 10-30 degrees; (2) computing linkage budget covered by the street trees, wherein a certain of demodulation threshold performance deterioration allowance can be preserved; and (3) automatically correcting the frequency, wherein the base station adjusts the base station receiving frequency according to the frequency offset of a received mobile phone signal. The mobile communication 3G / 4G electric wave propagation loss NPL model under the shade of the street trees and the network optimization method are used for optimizing the effective coverage of the mobile communication network and reducing the dropped call rate.

Description

technical field [0001] The invention relates to the 3G / 4G mobile communication system of the third generation and the fourth generation, specifically, an NPL model and a network optimization method of the 3G / 4G radio wave propagation loss of mobile communication under the cover of high-density multi-leaf street trees. Background technique [0002] In the research of land mobile communication system design and wireless channel propagation characteristic model, usually only consider the influence of factors such as urban buildings, topography, and ground objects on radio wave transmission, and ignore the absorption of electromagnetic waves by the dense leaves of street trees. In recent years, people have paid more and more attention to the issue of urban greening, and various high-density multi-leaf street trees have continuously appeared on both sides of the city's streets, improving the living environment. The results of the study show that the dense foliage not only reduces...

AI Technical Summary

Problems solved by technology

[0008] It can be seen that in the design and calculation of the mobile channel propagation loss model, the absorption of electromagnetic waves by the dense leaves of street trees has never been considered, which is the current deficiency in this field

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