LF/MF BROADCASTING, REGIONS 1 AND 3, GENEVA, 1975 Fadila Gasior Radiocommunication Bureau. Evolution of the GE75 Plan GE75

Transcription

1 LF/MF BROADCASTIG, REGIOS 1 AD 3, GEEVA, 1975 Fadila Gasior Radiocommunication Bureau 1 Introduction LF and MF broadcasting is regulated by the Agreement established in 1975 in Geneva by the Regional Administrative LF/MF Broadcasting Conference for Regions 1 and 3 The frequency bands allocated to the broadcasting service are: khz for LF in Region 1 only This band has 15 channels used mainly in the European Broadcasting Area; khz for MF in Regions 1 and 3 This band has 120 channels of which three are reserved for low power transmitters or LPCs (1 485 khz, khz and khz) For these three low-power channels (LPCs) the maximum effective monopole radiated power must not exceed 1 KW Channel spacing for these bands is 9 khz The carrier frequencies correspond to integral multiples of 9 The Plan entered into force on 23 ovember 1978 and contained approximately daytime stations and night-time stations It currently contains daytime stations and night-time stations The following graph shows the number of modifications processed during the last ten years Evolution of the GE75 Plan GE ear o Plan modification procedure The Agreement contains a Plan modification procedure set forth in Article 4 The procedure allows a frequency assignment s characteristics to be modified or a new assignment to be entered both for low-power or other channels BIEIAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

2 Modification pertaining to a channel other than an LPC (flowchart GE75_1) An administration wishing to modify the characteristics of an assignment in the Plan or to add a new assignment sends the Bureau the characteristics of the modification or addition using a T03 form of notice (Circular Letter CR/125) in paper format or by electronic file, indicating the names of the administrations with which agreement has been reached The Bureau determines those frequency assignments in conformity with the Plan that may be considered to be affected and publishes the characteristics of the modifications in Part A of a GE75 Special Section together with the names of the administrations considered to be affected An assignment is considered to be affected when its usable field-strength resulting from the original recording in the Plan is increased by a value of 05 db or more For these calculations, the technical criteria in Annex 2 to the Agreement are applied To avoid unjustifiable refusals, the Agreement specifies the increase in the interfering field strength which the administration consulted has to accept The value of 05 db given above defines the limit to the amount by which interference may be increased before it is recognized as unacceptable Thus there can be no objection if the usable field-strength is increased by less than 05 db An increase of 05 db or more is subject to negotiation In application of Article 4, BR calculates the usable field-strength and corresponding usable distance every 20 degrees in azimuth for each new assignment or each modification and stores the values thus obtained in the database The time limit for submitting comments is 16 weeks from publication in Part A If no comment is received within that 16-week period or if agreement is reached with administrations that have submitted comments, the administration on whose behalf the proposed modification was published informs the Bureau, indicating the final characteristics of the frequency assignment together with the names of the administrations with which agreement has been reached The administration may then implement its project The Bureau publishes the information in Part B of the GE75 Special Section and updates the Plan 22 Simplified procedure (flowchart GE75_2) A simplified procedure applies for minor modifications, such as slight changes in geographical coordinates, or for modifications which would only reduce the probability of interference, such as power reductions Such modifications are directly published in Part B of the GE75 Special Section and entered in the Plan 23 Modifications to a low-power channel (LPC) (flowchart GE75_3) A proposed modification to an LPC is not published in Part A of the GE75 Special Section Any administration proposing such a change has to obtain the agreement of any other administration having territories within a limiting distance of the proposed station ( 483 of Annex 2 to the Regional Agreement) Once all necessary agreements have been obtained, the administration proposing the modification informs the Bureau, giving the characteristics of the station together with the names of the administrations with which agreement has been reached The Bureau publishes the information in Part B of the GE75 Special Section and updates the Plan REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

3 Cancellation of an assignment in the Plan (flowchart GE75_4) When an assignment in conformity with the Agreement is withdrawn, the administration concerned immediately informs the Bureau The Bureau publishes this information in Part C of the GE75 Special Section and updates the Plan All this information appears on the BR IFIC DVD-ROM A summary is also published on the ITU website at the following URL: Regularly updated information may be found on the ITU website at the following URL (TIES account required): The Article 4 procedure must be reimplemented if the final characteristics are submitted after a period of one year from the date of publication in Part A of the Special Section (see the Rules of Procedure, Part A3) 3 Introduction of digital modulation The Radio Regulations Board (RRB) has adopted a rule of procedure allowing the introduction of digital modulation in the GE75 Plan The following text was adopted: After consideration of the relevant ITU-R studies, the Board decided that frequency assignment for AM broadcasting in the Plan may provisionally be used with digital modulation (transmission types DRM 2 A2 or B2), provided the radiation is reduced by at least 7 db in all directions, compared to the radiation of the AM modulated frequency assignment in the Plan The power of the transmitter to be notified in case of digital modulation shall be the total power within the necessary bandwidth In the examination of the probability of interference from notices related to assignments using digital modulation, the Bureau shall use a co-channel protection ratio increased by 7 db, and an adjacent channel protection ratio increased by 1 db compared to the one applicable to the interfered transmitter When the proposed assignment using digital modulation is recorded into the Plan following the application of Article 4, it shall bear a symbol indicating that the recording is provisional The reference situation shall be determined as if it were an AM transmission using an audio-frequency modulating signal of 45 khz and a high degree of compression This Rule of Procedure is of a provisional nature until such time that it is confirmed by a competent conference empowered to deal with the subject matter 2 The DRM system is described in Recommendation ITU-R BS otification of frequency assignments The notification procedure set forth in Article 5 of the Agreement is necessary only when an assignment is brought into use An administration wishing to bring a broadcasting assignment into operation in conformity with the Agreement must notify it to the Bureau in conformity with the provisions of Article 11 of the Radio Regulations REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

4 - 4 - The procedure is as follows: the administration sends a notification request to BR (T03 form of notice); the Bureau publishes the assignment s characteristics in Part I of the BR IFIC; the Bureau examines the assignment under the provisions of Article 11 and issues a finding: favourable, if the characteristics are in conformity with the RR and the Plan The assignment is published in Part II of the BR IFIC and entered in the Master International Frequency Register, generally known as the MIFR; unfavourable, if the characteristics are not in conformity with the RR or the Plan The assignment is published in Part III and returned to the administration References Final Acts of the Regional Administrative LF/MF Broadcasting Conference (Regions 1 and 3), Geneva, 1975, available on the ITU website at the following URL: Circular Letter CR/125 of 30 July 1999, available on the ITU website at the following URL: The Rules of Procedure, available on the ITU website at the following URL: Modification of the GE75 Plan Article 4 of the Regional Agreement Modification procedure for an assignment in the Plan for minor modifications 4329 Procedure for the modification of an assignment in the Plan or an addition 4321 Procedure for the modification of an assignment in the Plan or for an addition in a lowpower channel (LPC) 433 Cancellation of an assignment entered in the Plan Flowchart GE 75 _ 2 Flowchart GE75_1 Flowchart GE75_3 Flowchart GE 75 _ 4 REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

5 - 5 - Flowchart GE75_1 Procedure for the modification of an assignment in the Plan or an addition 1 Administration A requests modification to the characteristics of an Assignment in the Plan or an addition (4321) Information complete? I BR identifies Administrations B whose assignments are affected (4322) On date D1 the Bureau: publishes in Part A of the GE75 Special Section the information received from Administration A together with the names of the affected administrations that have given their agreement; communicates the results of the calculations to Administrations A and B together with the deadline for the receipt of comments (4323) BR writes and requests clarification 6 An Administration C may consider itself to be affected It sends justifications to BR and to Administration A 7 Justifications in conformity with 3 2 5? 8 Objection refused BR Ojection informs refusée BR Administration informe adm C C 9 Objection accepted BR includes Admin C in the list of affected countries Administration A is informed by BR 10 Any Toute administration peut demander may request à adm Administration A des renseignements A for additional supplémentaires information ( 3 2 (327) 7) Dans In ce such cas a le case, délai the est deadline prorogé de is extended 8 semaines by 8 weeks Has Admin A received objections within the 16 week period? Admin A adapts its requirements to the suggestions of Administration B Admin A can also: - request assistance from BR - modify its project 15 Does Admin A request entry in the Plan? Admin A sends the Bureau the final characteristics and names of the administrations with which the agreement has been reached (43210) 17, BR verifies and publishes the information in a GE75 Special Section and updates \the Plan *(43212) ( months prior to the end of the one-year period (D1+305 days BR sends a reminder to Administrations A that have not submitted a Part B request (Part ( A3 of the Rules of Procedure) On date D1+365 days, BR withdraws From the system those modifications of Administrations A that have not Completed the procedure (Part A3) 18 REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

6 - 6 - Flowchart GE75_2 Modification procedure for an assignment in the Plan minor modifications 1 Administration A requests modifications to the characteristics of an assignment in the Plan in conformity with Information complete? Return to Administration 4 Are the provisions of 4329 applicable? Application of procedure in flowchart GE75_1 5 6 BR verifies and publishes the information in a Special Section and updates the Plan (43212) REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

7 - 7 - Flowchart GE75_3 Procedure for the modification of an assignment in the Plan or an addition in a low-power channel (LPC) 1 Administration A requests modification of the characteristics of an LPC or an addition (433) khz khz khz 2 Information complete and in conformity with 331 and 332? BR returns the otice to Administration A 3 4 BR publishes the information in Part B of the GE75 Special Section and updates the Plan (433) REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE

8 - 8 - Flowchart GE75_4 Cancellation of an assignment entered in the Plan 1 Administration A requests cancellation of an assignment entered in the Plan 2 Information complete? BR returns the notice to Administration A 3 4 BR publishes the information in Part C of the GE75 Special Section and updates the Plan (43212) REGIOAL RADIOCOMMUICATIO SEMIAR APRIL 2007 ABU DHABI, UAE