Spectrum management intelligent system Introduction
동영상 자막
Radio waves, realizing more value. SMIS Korea started using radio waves with the first wireless communication between battleship Gwangje and Wolmi-do station in 1910 which led to radio broadcasts in 1927, television broadcasts in 1961 and wireless phone service in cars in 1984. In the 1990’s, commercial TV broadcasting was spread and CDMA service was introduced and in the 2000’s new broadcasting and telecommunication services advanced by leaps and bounds to include technologies like satellite broadcasting, DMB, Wibro and LTE. In addition, the use of radio waves has grown in many areas of society including transportation, national defense and healthcare, really taking the value of radio waves to a new level. At the heart of all of these diverse and innovative services, is the radio wave. To allow more systemic and efficient wireless service which is of the essences in daily life of modern people, National Radio research Agency is carrying out various projects such as amendments to broadcasting and telecommunications technical standards, testing and certification/verification for broadcasting and telecommunication equipments, national and international standardization activities, etc.. As the information system to supports these projects, Spectrum Management Intelligent System is made up of broadcast network analysis system, terrestrial network analysis system, satellite network analysis system and Frequency sharing analysis system that conducts analysis on the interference between different wireless services as well. Let’s take a closer look at the broadcast network analysis system. What is meant by broadcast networks is the broadcast facilities in key locations throughout the country in order to provide television, radio and DMB broadcast services and connecting these facilities wirelessly. Broadcast network analysis is used when setting up new broadcast facilities or changing existing one. Broadcast network analysis system is made up of functions that can analyze how broadcast signals are monitored and analyze broadcast areas to designate frequencies. To analyze broadcast areas, information of frequencies which transmitted from broadcast facilities, antenna height and output is used to verify regions where broadcast services are available. The height and type of terrain as well as the height of buildings is taken into consideration when conducting the analysis. If you look at the screen you can see that the broadcast signal is blocked in certain regions because of the terrain. To solve this problem, the output of the broadcast facilities, antenna height and direction can be adjusted. Analysis of interference to the broadcast signal refers to determining the location where the frequencies of nearby broadcast facilities are affecting each other. The green color shows areas where broadcast signal is smooth, the red color shows where there is interference. In order to fix problems with interference output, antenna height and direction can be adjusted to create smooth reception. Terrestrial networks refer to the constructed facilities that support wireless networks for fixed broadband and integrated communication services and CDMA, LTE, TRS and other telecommunication services and microwaves that form the backbone of the country’s communication network. Terrestrial Network Analysis System is made up of functions that analyze whether there is interference in the service area of the transmitter and whether frequencies sent from the transmitter can be smoothly received by the receiver. As you can see on the screen, numbers from the frequencies sent from the transmitter, antenna height and direction are inputted as well as information on the location of the receiver to determine whether the desired signal can be received. Let’s take a look at the interference analysis between transmitter and receiver. Establish which facilities can have an effect on the facilities you want to analyze and input the frequency and other parameters. The green points on the screen show which regions have smooth signal and the red points show where there is interference. In order to reduce interference, one can assume that changing the output, antenna height and direction will change it to green. Let’s take a look at the Satellite Network Analysis System. Satellite networks refer to the use of satellites floating in the sky and earth stations to wirelessly connect inter-satellite and satellite-earth stations. The Satellite Network Analysis System manage satellites which is registered in the ITU and performs analysis to coordinate interference between satellite networks and earth stations. Newly launched satellites can cause interference in existing satellite networks. In order to verify this, analysis is performed on satellites and earth stations that are expected to cause interference and based on the results that country adjusts the frequency and output. Registering earth station with the ITU can cause interference in the satellite networks of neighbor countries. In order to resolve this, information from the satellite network of the country that needs the coordination is analyzed and the frequency and output of that country is adjusted. Satellite Network Analysis System protects our country’s existing satellite network and analyzes the interference from neighbor countries in order to secure new satellite networks. Information on the frequency, output and direction of the antenna is analyzed and the results are posted as seen on the screen. Functions on the Satellite Network Analysis System allow for registration with the ITU to acquire international frequencies and prevents conflicts with the frequencies of other countries. Frequency Sharing Analysis Systems use the methods of analysis as in the aforementioned broadcast networks, terrestrial networks etc to analyze criteria for frequency sharing when different wireless equipment and services using same frequency band. Choose the wireless facilities you want to analyze and choose the wireless facilities that can cause interference. Input detailed figures on the wireless facility’s location and output and set protection ratio. The green color indicates areas where service is possible and the red color indicates areas that have interference. The output of wireless facilities, antenna height and direction can be adjusted to reduce interference. Spectrum Management Intelligent System provides latest functions to analyze frequency in order to smoothly operate broadcast/communication services and through this is paving the way for a bright future for countries strong in radio waves. To improve public convenience and to enhance international competitiveness. Creating infinite value from radio resources! National Radio research Agency is responsible for this.
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