CN108990074B - Map information-based power system wireless private network base station construction planning method - Google Patents
Map information-based power system wireless private network base station construction planning method Download PDFInfo
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Abstract
The invention discloses a method for constructing and planning a wireless private network base station of a power system based on map information, which comprises the steps of calculating or measuring the signal transmitting power of all candidate planning base stations; measuring 1785-1805 MHz signal level and 223-235 MHz signal level at the terminal position; calculating the communication coverage range of each candidate planning base station; marking on a map; and calculating the optimal position of the candidate planning base station. The power system wireless private network base station construction planning method based on map information provided by the invention researches LTE230M and LTE1800M signal frequency spectrums and pilot frequency networking strategies, and simultaneously provides a maximum coverage and minimum base station search algorithm based on measured data, so that a power wireless private network which has higher construction adaptability and anti-interference performance and wider coverage and meets the power system requirements is better, and the method is scientific and reliable.
Description
Technical Field
The invention particularly relates to a map information-based power system wireless private network base station construction planning method.
Background
With the development of economic technology and the improvement of living standard of people, electric energy becomes essential secondary energy in production and life of people, and brings endless convenience to production and life of people.
At present, the development of a safe, reliable and efficient smart grid has become a necessary trend. The intelligent power grid power distribution and utilization service has the characteristics of multiple and wide terminal points, distributed dispersion, large system capacity, high requirements on instantaneity and reliability and the like. Although the optical fiber communication mode has the advantage of strong service transmission capability, the deployment and construction difficulty is high, the cost is high, and the requirement for full coverage of mass power distribution and utilization terminals cannot be met. With the rapid development of wireless bandwidth communication technology, as a supplementary means for power wired optical fiber communication, the supporting capability of wireless communication for power distribution and utilization services has been well recognized, and more places incorporate the wireless technology into the construction of a local smart grid to solve the technical problems of intelligent full coverage of power distribution and utilization, full information acquisition and the like.
In terms of the policy of frequency band resource usage, the' notice about the frequency band planning of the printed civil ultrashort wave telemetry, remote control and data transmission service (No. 1991) issued by the national radio management committee stipulates that the 223-235 MHz (230 MHz for short) frequency band and the 1785M-1805 MHz (1800 MHz for short) frequency band can be used for constructing an electric power wireless private network. And the existing power wireless communication system mainly includes an LTE230 system and an LTE1800 wireless bandwidth communication system. The LTE230 system is a wireless private network communication system working at a 230MHz frequency band, relies on LTE key technology and system architecture, combines the characteristic of 230MHz frequency spectrum discrete distribution, adopts a carrier aggregation technology to achieve a bandwidth transmission effect, has the advantages of low cost, wide coverage and the like, but has smaller self bandwidth, the frequency band memory also has the interference of a 230M data transmission radio station, the service capability of the LTE230 system is limited, and the application value of the LTE230 system is difficult to popularize independently. The main private network system of the 1800MHz frequency band is an LTE1800 system, the system is obtained by frequency change of standard public network LTE equipment, and the system has the advantages of large terminal bandwidth, strong high bandwidth service support capability, industrial chain and the like, but the coverage area is small, the network construction and maintenance cost is higher, and the service of the whole intelligent power grid information full-acquisition transmission is difficult to support independently.
Therefore, at present, no research is available on the construction planning of the power system wireless private network base station, so that the construction of the power system wireless private network base station is in a blank state.
Disclosure of Invention
The invention aims to provide a power system wireless private network base station construction planning method based on map information, which is scientific and reliable and meets the requirements of a power system.
The invention provides a method for constructing and planning a power system wireless private network base station based on map information, which comprises the following steps:
s1, calculating or measuring signal transmitting power of all candidate planning base stations aiming at an area needing wireless private network planning;
s2, measuring 1785-1805 MHz frequency band noise interference level and 223-235 MHz frequency band noise interference level at the geographical position of all terminals aiming at the area needing wireless private network planning;
s3, calculating the communication coverage range of each candidate planning base station according to the signal transmitting power of each candidate base station obtained in the step S1;
s4, marking the 1785-1805 MHz frequency band noise interference level and the 223-235 MHz frequency band noise interference level near each terminal obtained in the step S2 and the communication coverage range of each candidate planning base station obtained in the step S3 on a map respectively;
and S5, calculating the optimal position of the candidate planning base station according to the mark obtained in the step S4, thereby completing the construction and planning of the wireless private network base station.
Calculating or measuring the signal transmission power of all candidate planning base stations in the step S1, specifically calculating the signal transmission power of the candidate planning base station to be set; for the base station which is established and can be directly utilized, the signal transmission power of the candidate planning base station is directly measured.
Step S2, measuring the 1785-1805 MHz frequency band noise interference level and the 223-235 MHz frequency band noise interference level at the geographic positions of all the terminals, specifically adopting the following steps to measure:
A. measuring the frequency spectrum of 1785-1805 MHz band and 223-235 MHz band of the position by adopting a spectrum analyzer;
and B, in the 1785-1805 MHz frequency band, taking the level average value of 100 frequency points acquired by a frequency spectrograph and supplemented by software as the average noise interference level of the frequency band, in the 223-235 MHz frequency band, determining the interval where 40 discrete frequency points can be used by electric power, and taking the level average value of the frequency points distributed in the interval in the 240 frequency points acquired by the frequency spectrograph and supplemented by software as the average noise interference level of the electric power communication of the frequency band.
C. And B, judging the signal level and the noise level obtained by the measurement in the step A:
if the ratio of the signal level to the noise level is smaller than a preset threshold value under any communication frequency, the position is determined to have larger interference under the communication frequency;
if the ratio of the signal level to the noise level is greater than or equal to a preset threshold value under any communication frequency, the communication quality of the position under the communication frequency is determined to be reliable.
Step S3, calculating the communication coverage of each candidate planning base station, specifically, calculating by using the following steps:
A. calculating the signal propagation loss of a 1785-1805 MHz communication frequency band by adopting a COST231-Hata model;
B. calculating the signal propagation loss of a 223-235 MHz communication frequency band by adopting an Okumura-Hate model;
C. confirming the communication coverage area of each candidate planning base station by adopting the following formula: and the transmission power-signal propagation loss of the candidate planning base station is greater than the communication threshold value of the terminal + the communication noise.
The calculating of the optimal position of the candidate planning base station in step S5 specifically includes the following steps:
(1) selecting a communication frequency band;
(2) selecting one candidate planning base station with the most covered terminals from all candidate planning base stations as a selected base station;
(3) selecting one base station which covers the terminal which is not covered by the selected base station from the rest base stations, and adding the selected base station into the selected base station;
(4) repeating the step (3) until all the terminals are covered by the base station, thereby obtaining the positions of the candidate planning base stations;
(5) and selecting the position and the communication frequency band of the final candidate planning base station according to the positions of the candidate planning base stations of the communication frequency bands, thereby finishing the planning.
The power system wireless private network base station construction planning method based on map information provided by the invention researches LTE230M and LTE1800M signal frequency spectrums and pilot frequency networking strategies, and simultaneously provides a maximum coverage and minimum base station search algorithm based on measured data, so that a power wireless private network which has higher construction adaptability and anti-interference performance and wider coverage and meets the power system requirements is better, and the method is scientific and reliable.
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FIG. 1 is a process flow diagram of the process of the present invention.
Detailed Description
FIG. 1 shows a flow chart of the method of the present invention: the invention provides a method for constructing and planning a power system wireless private network base station based on map information, which comprises the following steps:
s1, calculating or measuring signal transmitting power of all candidate planning base stations aiming at an area needing wireless private network planning; specifically, for a candidate planning base station to be set, calculating the signal transmission power of the candidate planning base station; for the base station which is established and can be directly utilized, directly measuring the signal transmission power of the candidate planning base station;
s2, measuring 1785-1805 MHz frequency band noise interference level and 223-235 MHz frequency band noise interference level at the geographical position of all terminals aiming at the area needing wireless private network planning; specifically, the following steps are adopted for measurement:
A. measuring the frequency spectrum of 1785-1805 MHz band and 223-235 MHz band of the position by adopting a spectrum analyzer;
B. for a 1785-1805 MHz frequency band, taking the level average value of 100 frequency points acquired by a frequency spectrograph and supplemented by software, wherein the level average value is taken as the average noise interference level of the frequency band; for 223-235 MHz frequency bands, determining an interval where 40 discrete frequency points can be used by a power system, and taking a frequency point level average value distributed in the interval in 240 frequency points acquired by a frequency spectrograph and 260 frequency points supplemented by software as an average noise interference level of power communication of the frequency band;
C. and B, judging the signal level and the noise level obtained by the measurement in the step A:
if the ratio of the signal level to the noise level is smaller than a preset threshold value under any communication frequency, the position is determined to have larger interference under the communication frequency;
if the ratio of the signal level to the noise level is greater than or equal to a preset threshold value under any communication frequency, the communication quality of the position under the communication frequency is determined to be reliable;
aiming at the area needing to be accessed to the electric power wireless private network, carrying out spectrum analysis on each terminal in the area; and respectively connecting a spectrum analyzer to the 1800M antenna and the 230M antenna for signal detection, measuring the 1800M signal level and the 230M signal level and the noise level of each terminal position, and when the ratio of the signal level to the noise level of a certain frequency band is lower than a threshold value, considering that the signal interference of the frequency band is large. The threshold value can be tested according to different environments, so that the threshold value with strong applicability is obtained; a higher threshold value can be selected for areas with high communication quality, and a relatively lower threshold value can be selected for areas with low communication quality requirements, but normal communication can be guaranteed; different thresholds are selected according to different environments, so that the flexibility and the adaptability are higher, and the number of base stations can be reduced by selecting a lower threshold, so that higher economic benefit can be brought;
s3, calculating the communication coverage range of each candidate planning base station according to the signal transmitting power of each candidate base station obtained in the step S1; specifically, the following steps are adopted for calculation:
a. calculating the signal propagation loss of a 1785-1805 MHz communication frequency band by adopting a COST231-Hata model;
the method is mainly used for calculating the signal propagation loss of the wireless system with the frequency of more than 1.5 GHz. The COST231-Hata radio wave propagation model is based on the Oku-mura-Hata model, and is developed by Okumura-Hata model by the European research Committee, COST231 working group, and the upper limit of frequency is extended from 1500MHz to 2 GHz. The method is a propagation model of semi-empirical and semi-theoretical, and is examined by a large amount of experimental data.
The empirical formula for the COST231-Hata model is as follows:
LM＝46.33+(44.9-6.55lg(ht))lg(d)+33.9lg(f)-a(hr)-13.82lg(ht)+C
wherein C is a propagation environment correction factor, 0 is taken from a medium-sized city and a suburb, and 3 is taken from a dense large-city area;
b. calculating the signal propagation loss of a 223-235 MHz communication frequency band by adopting an Okumura-Hate model;
the LTE230 adopts a theoretical propagation model of Okumura-Hata model and is mainly used for calculating the frequency of 150-1500 MHz. The Okumura-Hate model is an empirical model obtained according to statistical analysis of test data, is suitable for VHF and UHF frequency bands, and is characterized in that the field intensity median path loss of a large city area in a quasi-flat terrain is used as a reference, and other factors such as propagation environment, terrain conditions and the like are corrected by using correction factors.
The empirical formula for the Okumura-Hate model propagation loss is:
LM＝69.55+26.16lg(f)-13.82lg(ht)-α(hr)+[44.9-6.55lg(ht)]lg(d)
wherein f is the carrier frequency in MHz; ht is the effective height of the transmitting antenna, and the unit is m; hr is the effective height of the receiving antenna, in m; d is the distance between the transmitter and the receiver, and the unit is km; α (hr) is a receive antenna height correction factor, the value of which depends on environmental factors. In medium and small cities, a (hr) ═ 0.7 (1.1lg (f)) -0.7 (dB) hr- (1.56lg (f)) -0.8; in two cases, when f is less than or equal to 200MHz, a (hr) is 8.29(lg1.54hr)2-1.1(dB), and when f is more than or equal to 400MHz, a (hr) is 3.2[ lg (11.75hr) ]2-4.97 (dB);
according to the conclusion of 'LTE 1.8G and 230M comparison test analysis report' of Jiangsu corporation of China network, under the dense shielding environment of urban areas, the coverage radius of LTE 1.8G is basically consistent compared with that of LTE230M, and LTE 1.8G has obvious advantages in throughput compared with that of LTE 230M.
The path loss of different environments is simulated, and the larger the propagation distance is, the more the path loss is. When the transmission distance of the LTE230 is 7km, the path loss is about 140dB, the transmission distance of the LTE1800 is about 1.4km, and the path loss reaches 140 dB; when the path loss is 120dB, the transmission distance of LTE230 is about 2km, and the transmission distance of LTE1800 is 0.5 km. It can be seen that the coverage distance of LTE230 is better than LTE 1800;
different threshold values can be set in different environments, and the coverage index is RSRP > noise + threshold, wherein the RSRP is base station transmission power-path loss, and therefore a specific coverage area is determined;
c. confirming the communication coverage area of each candidate planning base station by adopting the following formula: the transmission power-signal propagation loss of the candidate planning base station is greater than the communication threshold value of the terminal and the communication noise;
s4, marking the 1800MHz signal level and the 230MHz signal level of each terminal obtained in the step S2 and the communication coverage range of each candidate planning base station obtained in the step S3 on a map respectively;
s5, calculating the optimal position of the candidate planning base station according to the mark obtained in the step S4, thereby completing the construction planning of the wireless private network base station, and specifically adopting the following steps to calculate:
(1) selecting a communication frequency band;
(2) selecting one candidate planning base station with the most covered terminals from all candidate planning base stations as a selected base station;
(3) selecting one base station which covers the most terminals which are not covered by the selected base station from the rest base stations, and adding the selected base station into the selected base station;
(4) repeating the step (3) until all the terminals are covered by the base station, thereby obtaining the positions of the candidate planning base stations;
(5) and selecting the position and the communication frequency band of the final candidate planning base station according to the positions of the candidate planning base stations of the communication frequency bands, thereby finishing the planning.
Claims (2)
1. A power system wireless private network base station construction planning method based on map information comprises the following steps:
s1, calculating or measuring the signal emission power of all candidate planning base stations according to the area needing wireless private network planning;
s2, measuring 1785-1805 MHz frequency band noise interference level and 223-235 MHz frequency band noise interference level at the geographical position of all terminals aiming at the area needing wireless private network planning; specifically, the following steps are adopted for measurement:
A. measuring the 1800MHz and 230MHz signal levels and noise levels at the location using a spectrum analyzer;
B. for a 1785-1805 MHz frequency band, taking the level average value of 100 frequency points acquired by a frequency spectrograph and supplemented by software, wherein the level average value is taken as the average noise interference level of the frequency band; for 223-235 MHz frequency bands, determining an interval where 40 discrete frequency points can be used by a power system, and taking a frequency point level average value distributed in the interval in 240 frequency points acquired by a frequency spectrograph and 260 frequency points supplemented by software as an average noise interference level of power communication of the frequency band;
C. and B, judging the signal level and the noise level obtained by the measurement in the step A:
if the ratio of the signal level to the noise level is smaller than a preset threshold value under any communication frequency, the position is determined to have larger interference under the communication frequency;
if the ratio of the signal level to the noise level is greater than or equal to a preset threshold value under any communication frequency, the communication quality of the position under the communication frequency is determined to be reliable;
s3, calculating the communication coverage area of each candidate planning base station according to the signal transmission power of each candidate base station obtained in the step S1; specifically, the following steps are adopted for calculation:
a. calculating the signal propagation loss of a 1785-1805 MHz communication frequency band by adopting a COST231-Hata model;
b. calculating the signal propagation loss of a 223-235 MHz communication frequency band by adopting an Okumura-Hate model;
c. confirming the communication coverage area of each candidate planning base station by adopting the following formula: the transmission power-signal propagation loss of the candidate planning base station is greater than the communication threshold value of the terminal and the communication noise;
s4, marking the 1785-1805 MHz frequency band noise interference level and 223-235 MHz frequency band noise interference level of each terminal obtained in the step S2 and the communication coverage range of each candidate planning base station obtained in the step S3 on a map respectively;
s5, calculating the optimal position of the candidate planning base station according to the mark obtained in the step S4, thereby completing the construction and planning of the wireless private network base station; specifically, the following steps are adopted for calculation:
(1) selecting a communication frequency band;
(2) selecting one candidate planning base station with the most covered terminals from all candidate planning base stations as a selected base station;
(3) selecting one base station which covers the terminal which is not covered by the selected base station from the rest base stations, and adding the selected base station into the selected base station;
(4) repeating the step (3) until all the terminals are covered by the base station, thereby obtaining the positions of the candidate planning base stations;
(5) and selecting the position and the communication frequency band of the final candidate planning base station according to the positions of the candidate planning base stations of the communication frequency bands, thereby finishing the planning.
2. The method for planning the construction of the wireless private network base station of the power system according to claim 1, wherein the step S1 is performed to calculate or measure the signal transmission power of all candidate planning base stations, specifically to calculate the signal transmission power of the candidate planning base station to be set; for the base station which is established and can be directly utilized, the signal transmission power of the candidate planning base station is directly measured.
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| CN109526019B (en) * | 2018-12-26 | 2022-04-08 | 国网湖南省电力有限公司 | Method for correcting wireless private network base station coverage propagation model based on measured data |
| CN110366188B (en) * | 2019-07-31 | 2022-03-29 | 南瑞集团有限公司 | Interference measurement point deployment method, interference measurement path planning method and system |
| CN110831017A (en) * | 2019-11-14 | 2020-02-21 | 国网湖南省电力有限公司 | Site selection method for power system wireless private network base station construction |
| CN112469048B (en) * | 2020-11-30 | 2023-04-07 | 国网湖南省电力有限公司 | Method and system for acquiring coverage state of electric power wireless private network system based on actual measurement and correction, electronic equipment and readable storage medium |
| CN113920768A (en) * | 2021-10-09 | 2022-01-11 | 四川智胜慧旅科技有限公司 | Vehicle scheduling method and system suitable for self-driving scenic spot |
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