METHOD FOR DISTINGUISHING SUNNY-RAINY WEATHER BASED ON TIME DIVISION LONG-TERM EVOLUTION NETWORK

Abstract

Disclosed is a method for distinguishing sunny-rainy weather based on time division long-term evolution network, including the following steps: acquiring sunny-rainy feature by extracting communication measurement statistics of time division long-term evolution network base stations in a certain area; establishing a training set according to that observation result of multiple statistical periods, multiple base stations and multiple rain gauges in the region; establishing a sunny-rainy discrimination model combined with machine learning binary classification algorithm, so as to realize the identification of rainfall events covered by a single base station; calculating the reliability of rainfall events at specific locations based on the comprehensive judgment results of multiple base stations.

Claims

1. A method for distinguishing sunny-rainy weather based on a time division long-term evolution network, comprising: constructing a sunny-rainy discrimination model, and inputting a sunny-rainy feature and a sunny-rainy label matrix into the sunny-rainy discrimination model for training; and analyzing credibility of rainfall events in a coverage area of a base station based on the trained rain-sunny discrimination model.

2. The method according to claim 1, wherein, before constructing the sunny-rainy discrimination model, the method further comprises: selecting a plurality of normally working time division long-term evolution network base stations in a same area, and recording return information of communication terminals in each base station in a same statistical period; calculating a number of return parameters in each value interval, a total number of returns and an average number of return parameters; taking the number of the return parameters in each value interval, the total number of return parameters and the average number of return parameters as a communication measurement statistics; carrying out the calculation above in a plurality of statistical periods, and summarizing a plurality of the communication measurement statistics as the sunny-rainy feature; and constructing the sunny-rainy label matrix.

3. The method according to claim 2, wherein the process of constructing the sunny-rainy label comprises: for a plurality of rain gauges in the same area, judging whether there is a rainfall in the same statistical period based on an observation result of a rain gauge closest to a normally working time division long-term evolution network base station; and taking a judgment result as the sunny-rainy label, making and recording the above judgment in a plurality of statistical periods, and summarizing a plurality of the sunny-rainy labels obtained as the sunny-rainy label matrix.

4. The method according to claim 3, wherein the sunny-rainy labels are determined by taking an accumulated rainfall recorded by the closest rain gauge in space and a threshold value of 0.1 mm as a dividing standard.

5. The method according to claim 1, wherein the process of constructing the sunny-rainy discrimination model comprises: constructing the sunny-rainy discrimination model based on machine learning binary classification, wherein the machine learning binary classification comprises a bagged decision tree classification algorithm.

6. The method according to claim 2, wherein the process of inputting the obtained sunny-rainy feature and sunny-rainy label matrix into the sunny-rainy discrimination model for training comprises: taking the observation results of multi-statistical periods, multi-base stations and multi-rain gauges in the area in the sunny-rainy feature as a training set, and inputting into the sunny-rainy discrimination model; and conducting the training by identifying whether there is a rainfall event in the statistical period within the coverage area of the base station.

7. The method according to claim 6, wherein the process of conducting the training by identifying whether there is a rainfall event in the statistical period within the coverage area of the base station comprises: comprehensively judging the probability of rainfall events in a certain position in the area based on the results of sunny-rainy discrimination of all communicable base stations in the position.

8. The method according to claim 1, wherein the process of inputting the obtained sunny-rainy feature and sunny-rainy label matrix into the sunny-rainy discrimination model for training further comprises: testing the accuracy of the sunny-rainy discrimination model by ten-fold cross verification, and obtaining model performance indicators and a confusion matrix.

9. The method according to claim 1, wherein the process of analyzing the credibility of rainfall events in the coverage area of the base station based on the trained sunny-rainy discrimination model comprises: calculating a credibility of the rainfall based on an inverse distance weighting method.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without any creative effort.

[0034] FIG. 1 is a schematic diagram of the distribution of communication base stations, communication terminals and rain gauges in the embodiment of the present application, wherein BS represents communication base stations, RG represents rain gauges, and mobile phone icons represent communication terminals.

[0035] FIG. 2 is a working flow chart of a method for distinguishing sunny-rainy weather based on time division long-term evolution network in the embodiment of the present application, wherein the solid line represents the establishment process of a sunny-rainy discrimination model, and the dotted line represents the application process of the sunny-rainy discrimination model.

[0036] FIG. 3 is a confusion matrix of a single base station sunny-rainy discrimination model in the embodiment of the present application.

[0037] FIG. 4 is the calculation result of rainfall credibility at a certain position in the embodiment of the present application.

[0038] FIG. 5 describes the steps in the embodiment of the present invention, in which the communication measurement statistics of time division long-term evolution network base stations in a certain area are used to obtain the sunny-rainy feature, and a machine learning binary classification algorithm is combined to establish a sunny-rainy discrimination model to realize the identification of rainfall events covered by a single base station, and the credibility of rainfall events occurring at specific positions is comprehensively judged based on multiple base stations.

[0039] FIG. 6 describes the steps of obtaining the identification feature matrix of sunny-rainy weather based on the time division long-term evolution network base station in a certain area.

[0040] FIG. 7 describes the steps of establishing label matrix based on the observation results of rain gauge in the area.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all of them. Based on the embodiment of the present application, all other embodiments obtained by ordinary technicians in the field without creative labor are within the scope of the present application.

[0042] FIG. 1 is a schematic diagram of the distribution of communication base stations, communication terminals and rain gauges in the embodiment of the present application; FIG. 2 is a working flow chart of a method for distinguishing sunny-rainy weather based on time division long-term evolution network in the embodiment of the present application; FIG. 3 is a confusion matrix of a single base station sunny-rainy discrimination model in the embodiment of the present application; FIG. 4 is the calculation result of rainfall credibility at a certain position in the embodiment of the present application.

[0043] According to the application, the communication measurement statistics of time division long-term evolution network base stations in a certain area are used to obtain the sunny-rainy feature, and a machine learning binary classification algorithm is combined to establish a sunny-rainy discrimination model to realize the identification of rainfall events covered by a single base station, and the credibility of rainfall events occurring at specific positions is comprehensively judged based on multiple base stations, which mainly includes the following steps (as shown in FIGS. 5-7).

[0044] S1, obtaining the identification feature matrix of sunny-rainy weather based on the time division long-term evolution network base station in a certain area.

[0045] S101, selecting 116 normally working time division long-term evolution network base stations BS1, BS2, BS116 in the area, and each base station records the information returned by the mobile terminal in the s-th statistical period (statistical period T=60 (min)) (s=1, 2, . . . , 48);

[0046] S102, the m-th base station calculate the number of reference signal receiving power intervals n.sub.1,m,s, n.sub.2,m,s, . . . , n.sub.48,m,s (there are 48 intensity interval in total), the total sampling points N.sub.m,s of reference signal receiving power and the average reference signal receiving power Ave.sub.m,s according to the information returned by the mobile terminal;

[0047] S103, setting up the feature x.sub.m,s=[n.sub.1,m,s, n.sub.2,m,s, . . . , n.sub.K,m,s, N.sub.m,s, Ave.sub.m,s] of sunny-rainy identification in the s-th statistical period of the m-th base station, and obtaining the feature matrix:

[00001]$X=\left[\begin{array}{c}{X}_1\\ X_2\\ .Math.\\ X_{116}\end{array}\right]\left(X_m=\left[\begin{array}{c}{x}_{m,1}\\ x_{m,2}\\ .Math.\\ x_{m,48}\end{array}\right],m=1,.Math.,116\right),$

[0048] and normalizing X to obtain X′;

[0049] S2, establishing label matrix based on the observation results of rain gauge in the area.

[0050] S201, There is a rain gauge RG.sub.1 in the area, and judging whether there is a rainfall in the s-th statistical period of the m-th base station according to the observation result of RG.sub.1, and using the judgment result as the sunny-rainy label y.sub.m,s:

[00002]$y_{m,s}=\{\begin{array}{c}1,\mathrm{if}{\mathrm{Acc}}_{{\mathrm{RG}}_1,s}>0.2\mathrm{mm}\\ 0,\mathrm{if}{\mathrm{Acc}}_{{\mathrm{RG}}_1,s}\le 0.1\mathrm{mm}\end{array},$

[0051] wherein Acc.sub.RG.sub.1.sub.,s is the accumulated rainfall (mm) recorded by RG.sub.1 in the s-th statistical period.

[0052] S202, Combining the sunny-rainy labels to obtain a label matrix:

[00003]$Y=\left[\begin{array}{c}{Y}_1\\ Y_2\\ .Math.\\ Y_{116}\end{array}\right]\left(Y_m=\left[\begin{array}{c}{y}_{m,1}\\ y_{m,2}\\ .Math.\\ y_{m,S}\end{array}\right],m=1,.Math.,116\right).$

[0053] S3, Constructing the training set [X′, Y] according to the historical data, and the classification algorithm of bagged decision tree is combined to establish a sunny-rainy discrimination model to identify whether there is a rainfall event in a statistical period within the coverage of a base station.

[0054] S4, Testing the accuracy of the sunny-rainy discrimination model by ten-fold cross verification, and obtaining the model performance indicator and confusion matrix.

[0055] S5, in practical application, taking a specific location O as an example, comprehensively judging the probability of rainfall events in this location according to the results of sunny-rainy discrimination of all communicable base stations in the area. The number of all communicable base stations in location O is a=3, and the number of communicable base stations judged as rainy period in a certain statistical period is b. Calculate the credibility of rainfall events in this location in this statistical period according to the inverse distance weighting:

[00004]$\mathrm{credibility}=\frac{\underset{j=1}{\overset{b}{.Math.}}{d}_{\mathrm{rain},j}^{-2}}{\underset{i=1}{\overset{3}{.Math.}}{d}_{\mathrm{all},i}^{-2}},$

[0056] where d.sub.rain,j (km) is the distance between the j-th communicable base station judged to be in the rainy period and this location, and d.sub.all,i (km) is the distance between the i-th communicable base station and this location. The calculation results are shown in FIG. 4 and Table 1.

TABLE-US-00001 TABLE 1 d.sub.all, 1 d.sub.all, 2 d.sub.all, 3 y.sub.1, s y.sub.2, s y.sub.3, s d.sub.rain, 1 d.sub.rain, 2 d.sub.rain, 3 credibility 2 km 1.5 km 1 km 1 1 1 d.sub.all, 1 d.sub.all, 2 d.sub.all, 3 1.00 1 1 0 d.sub.all, 1 d.sub.all, 2 — 0.41 1 0 1 d.sub.all, 1 d.sub.all, 3 — 0.74 1 0 0 d.sub.all, 1 — — 0.15 0 1 1 d.sub.all, 2 d.sub.all, 3 — 0.85 0 1 0 d.sub.all, 2 — — 0.26 0 0 1 d.sub.all, 3 — — 0.41 0 0 0 — — — 0.00

[0057] In the practical application process, according to the feature extracted from the time division long-term evolution network measurement report, the sunny-rainy label of single base station coverage and the comprehensive judgment result of rainfall credibility of multi-base station intersection area can be directly obtained.

[0058] The above shows and describes the basic principle, main features and advantages of the present application. It should be understood by those skilled in the art that the application is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the application. Without departing from the spirit and scope of the application, there will be various changes and improvements of the application, all of which fall within the scope of the claimed application. The scope of that application is defined by the appended claim and their equivalents.