Frequency Assignment to Various Wireless Applications
Sunday, January 30th, 2011 |
RADIO SPECTRUM MANAGEMENT PROCESS
•Determine international allocations at ITU
•Develop national policy on allocation and utilization
•Technical rules and procedures for the use of allocations
•Licensing in accordance with policy and technical rules and procedures
•Frequency assignment
Definitions of various terms
allocation (of a frequency band): Entry in the Table of Frequency Allocations of a given frequency band for the purpose of its use by one or more terrestrial or space radiocommunication services or the radio astronomy service under specified conditions. This term shall also be applied to the frequency band concerned.
•Allocation is done by ITU and described in the frequency allocation table of ITU
•It is done on ITU Region basis
•It contains frequency bands and radio services to which this band can be used on primary and secondary basis and also Footnote numbers
•The footnote provides the regulatory base for the use of the band for certain services or all the services
allotment (of a radio frequency or radio frequency channel): Entry of a designated frequency channel in an agreed plan, adopted by a competent conference, for use by one or more administrations for a terrestrial or space radiocommunication service in one or more identified countries or geographical areas and under specified conditions.
•Frequency allotment is done by ITU as well as National Spectrum Management authority
•It provides frequency plans for use of specific applications in the certain frequency bands
•There are allotment plans provided by ITU of radio services like Aeronautical communications, maritime, MW broadcasting, Satellite planned bands which are of Worldwide nature
Allotment is also done by National Spectrum management Authority in the form of National Frequency Allocation Plan which provides India remarks for specific allocations
assignment (of a radio frequency or radio frequency channel): Authorization given by an administration for a radio station to use a radio frequency or radio frequency channel under specified conditions.
•It is done to the end user based on their requests
•It contains technical parameters like frequency spots, bandwidth, RF Power, Antenna gain, Azimuth, locations, and time of operations
•It requires technical examination which includes RR, Existing assignment (NFR), characteristics of proposed Tx/Rx, etc
•EMC analysis is done using the radio propagation models as per ITU before arriving at actual frequency assignment.
Radio Spectrum Assignment
•Applications in the prescribed format are received for frequency assignment for various wireless based applications of radio communication services such as Government, private telecom operators, broadcasters, public sector undertakings and private captive users
•These applications are examined taking in to consideration RR NFAP, existing assignments, recommendations of ITU for technical bases in different frequency bands considering the technical parameter furnished
•Applications for Private Telecom Operators and FM broadcasters are examined within their allotted bands
•Besides, telecom operators and FM Broadcasters, other private captive users also have requirements deployed for specific firm and those are examined as per radio service options
•Radio services are also deployed by maritime, radio navigation, aeronautical communications
•Applications are examined on first cum first serve basis
Definitions
•assigned frequency band: The frequency band within which the emission of a station is authorized; the width of the band equals the necessary bandwidth plus twice the absolute value of the frequency tolerance.
•assigned frequency: The centre of the frequency band assigned to a station.
•characteristic frequency: A frequency which can be easily identified and measured in a given emission.
•A carrier frequency may, for example, be designated as the characteristic frequency.
•frequency tolerance: The maximum permissible departure by the centre frequency of the frequency band occupied by an emission from the assigned frequency or, by the characteristic frequency of an emission from the reference frequency.
•The frequency tolerance is expressed in parts in 106 or in hertz.
•necessary bandwidth: For a given class of emission, the width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under specified conditions.
•occupied bandwidth: The width of a frequency band such that, below the lower and above the upper frequency limits, the mean powers emitted are each equal to a specified percentage b/2 of the total mean power of a given emission.
