1、 Recommendation ITU-R M.2091-0 (10/2015) Methodology to calculate spectrum requirements within the frequency bands 1 545-1 555 MHz (space-to-Earth) and 1 646.5-1 656.5 MHz (Earth-to-space) for aeronautical mobile-satellite (R) service communications related to the priority categories 1 to 6 of Artic
2、le 44 of the Radio Regulations M Series Mobile, radiodetermination, amateur and related satellite services ii Rec. ITU-R M.2091-0 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical use of the radio-frequency spectrum by all radiocommunic
3、ation services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by World and Regional Radiocommunication Conferences and Radiocom
4、munication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used for the submission of patent statements and licensing declar
5、ations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series of ITU-R Recommendations (Also available online at http:/w
6、ww.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, amateur and related satellite services P Radiowave p
7、ropagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite news gathering TF Time signals and frequency standards
8、emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2015 ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without wr
9、itten permission of ITU. Rec. ITU-R M.2091-0 1 RECOMMENDATION ITU-R M.2091-01 Methodology to calculate spectrum requirements within the frequency bands 1 545-1 555 MHz (space-to-Earth) and 1 646.5-1 656.5 MHz (Earth-to-space) for aeronautical mobile-satellite (R) service communications related to th
10、e priority categories 1 to 6 of Article 44 of the Radio Regulations (2015) Scope This Recommendation provides a methodology to calculate aeronautical mobile-satellite (R) service spectrum requirements within the frequency bands 1 545-1 555 MHz (space-to-Earth) and 1 646.5-1 656.5 MHz (Earth-to-space
11、). It is intended to be used to quantify the spectrum requirements related to the AMS(R)S priority categories 1 to 6 of RR Article 44, for which the provisions of Resolution 222 (Rev.WRC-12) apply. Keywords AMS(R)S; spectrum requirements; priority communications; methodology Abbreviations/Glossary A
12、ES Aircraft Earth Station. As defined in RR No. 1.84 an AES is a mobile earth station in the aeronautical mobile satellite service located on board an aircraft AES Count: Number of actually operating AESs within the specified area of the satellite network and logged on to that satellite network unde
13、r consideration in a defined period, in a particular area/beam. Note that the AES count should include only those AES which are expected to make use of the satellite network AMS(R)S Aeronautical Mobile-Satellite (route) Service. As defined in RR No. 1.36, the AMS(R)S is an aeronautical mobile-satell
14、ite service reserved for communications relating to safety and regularity of flights, primarily along national or international civil air routes AOC Aeronautical Operational Control. AOC describes communications required for the exercise of authority over the initiation, continuation, diversion or t
15、ermination of flight for safety, regularity and efficiency reasons ATS Air Traffic Service; ATS is a generic term meaning variously, flight information service, alerting service, air traffic advisory services, air traffic control service (area control service, approach control service or aerodrome c
16、ontrol service) CS Circuit Switched Erlang A unit of traffic intensity. It is a dimensionless quantity expressing voice activity in units of time that would be seen in during some time interval, typically an hour. It is used to determine the number of circuits needed to satisfy circuit voice demand
17、1 The Russian Federation had objected to the adoption of this Recommendation for the reasons indicated in the report of the SG 4 Chairman to RA-15, and declares that this Recommendation will be applied only among operators providing services relating to the transmission of AMS(R)S traffic with prior
18、ities 1-6 of RR Article 44, contentious issues regarding the determination of spectrum requirements being resolved among the operators. 2 Rec. ITU-R M.2091-0 FEC Forward Error Correction GES Ground Earth Station. The GES is the earth station used for the feeder links of the AMS(R)S system. This is e
19、quivalent to an aeronautical earth station, as defined in RR No. 1.82 IP Internet Protocol ISDN Integrated Services Digital Network Related ITU Recommendations, Reports Recommendation ITU-R M.1037-0 Bit error performance objectives for aeronautical mobile-satellite (R) service (AMS(R)S) radio link R
20、ecommendation ITU-R M.1089-1 Technical considerations for the coordination of mobile-satellite systems relating to the aeronautical mobile satellite (R) service (AMS(R)S) in the bands 1 545 to 1 555 MHz and 1 646.5 to 1 656.5 MHz Recommendation ITU-R M.1180-0 Availability of communication circuits i
21、n the aeronautical mobile-satellite (R) services (AMS(R)S) The ITU Radiocommunication Assembly, considering a) that, in the frequency bands 1 525-1 559 MHz (space-to-Earth) and 1 626.5-1 660.5 MHz (Earth-to-space), geostationary mobile-satellite system operators currently use a capacity-planning app
22、roach at regional multilateral coordination meetings, under arrangements agreed between their administrations, to periodically coordinate access to the spectrum needed to accommodate their requirements, including the spectrum requirements of the AMS(R)S providing transmission of messages with priori
23、ty 1 to 6 in RR Article 44; b) that the methodologies should first and foremost provide accurate results avoiding overestimation or underestimation of spectrum needs, should reflect as closely as possible the algorithms actually employed by the satellite system under study and should provide a simpl
24、e, efficient and quick means for determining spectrum requirements; c) that only AMS(R)S priority communications 1 through 6 per RR Article 44 supported by the satellite system beam under study should be included in these methodologies to determine the spectrum requirements; d) that the methodologie
25、s should support the present AMS(R)S environment but take into consideration changes to the environment during the target period, including commencement of new AMS(R)S networks operation, changes in service offerings for the air traffic service (ATS) and aeronautical operational control (AOC), traff
26、ic, aircraft equipment, and technology; e) that the methodologies should account for the characteristics of the aircraft equipment and the satellite network, and should consider only the services and transmission capabilities afforded by the communication equipment deployed on the aircraft, the grou
27、nd earth station (GES) and satellite under study; f) that the methodologies should avoid double counting of the bandwidth accommodating the communication traffic in areas with overlapping satellite network coverage; g) that the information provided for each AMS(R)S satellite network, to be used as i
28、nput parameters to the methodologies, should, to the extent possible, be independently verifiable; Rec. ITU-R M.2091-0 3 h) that parameters used in the methodologies should have clear and adequate definition and/or description, as appropriate, avoiding the risk of misinterpretation, to ensure proper
29、 determination of AMS(R)S spectrum requirements priority communications 1 through 6 per RR Article 44 associated to each satellite beam; i) that the methodologies should account for only that portion of the AMS(R)S clients airspace in which satellite communications would be employed such as by exclu
30、ding airspace corresponding to areas in which VHF and HF communications are employed, further considering a) that spectrum needs of an AMS(R)S satellite network with multiple spot beams should be determined to the level of spectrum needs of each spot beam; b) that proper measures should be taken int
31、o consideration where an AMS(R)S satellite system is capable of dynamically configuring its satellite network resources; c) that proper measures should be taken into consideration where an AMS(R)S satellite network is capable of and support voice compression and/or data compression, recognizing a) t
32、hat WRC-97 allocated the frequency bands 1 525-1 559 MHz (space-to-Earth) and 1 626.5-1 660.5 MHz (Earth-to-space) to the MSS to facilitate the assignment of spectrum to multiple MSS networks in a flexible and efficient manner; b) that WRC-97 adopted RR No. 5.357A giving priority to the accommodatio
33、n of the spectrum requirements for the AMS(R)S providing transmission of messages with priority categories 1 to 6 in RR Article 44 in the frequency bands 1 545-1 555 MHz and 1 646.5-1 656.5 MHz; c) that Resolution 222 (Rev.WRC-12) relates to the use of the frequency bands 1 525-1 559 MHz and 1 626.5
34、-1 660.5 MHz by the mobile-satellite service, and procedures to ensure long-term spectrum access for the aeronautical mobile-satellite (R) service; d) that Resolution 422 (WRC-12) invites ITU-R to conduct studies on, and develop in one or more ITU-R Recommendations, a methodology, including clear de
35、finitions of input parameters and assumptions to be used, to calculate spectrum requirements within the frequency bands 1 545-1 555 MHz (space-to-Earth) and 1 646.5-1 656.5 MHz (Earth-to-space) for AMS(R)S communications related to the priority categories 1 to 6 of RR Article 44; e) that systems pro
36、viding broadband safety services have been developed, and are being considered by ICAO for incorporation into the aviation standards, noting a) that AMS(R)S systems are an essential element of the International Civil Aviation Organization standardized communications infrastructure used in air traffi
37、c management for the provision of safety and regularity of flight in civil aviation; b) that, since spectrum resources are limited, there is a need to use them in the most efficient manner within and amongst various MSS networks, recommends 1 that within the frequency bands 1 545-1 555 MHz (space-to
38、-Earth) and 1 646.5-1 656.5 MHz (Earth-to-space), the spectrum requirements for AMS(R)S communications related to the priority categories 1 to 6 of RR Article 44 to be assigned by bilateral or multilateral 4 Rec. ITU-R M.2091-0 frequency coordination meetings under Resolution 222 (Rev.WRC-12) should
39、 be calculated using the methodology described in Annex 1; 2 that, when the methodology contained in Annex 1 is agreed to be used during a frequency coordination meeting, the participants to this meeting should also agree on arrangements regarding the input parameters required to use the methodology
40、; 3 that, since relevant historical information for new AMS(R)S systems would not be available in advance of the commencement of their operation, established AMS(R)S operators should make available, in a timely manner, at frequency coordination meetings the relevant historical information applicable
41、 to the service area of the new AMS(R)S operator, required to determine spectrum requirements for the first year of operation of new systems, using the methodology contained in Annex 1; 4 that any ambiguity in specific parameters of the methodology contained in Annex 1 (e.g. whether messages are rel
42、ated to the priority categories 1 to 6 of RR Article 44) should be resolved with mutual agreement on assumptions; 5 that any alternative methodologies to determine the spectrum requirements for AMS(R)S communications related to the priority categories 1 to 6 of RR Article 44 to be assigned by bilate
43、ral or multilateral frequency coordination meetings under Resolution 222 (Rev.WRC-12) should be based on the principles and guidelines contained in considering b) to i) and further considering a) to c). Annex 1 Method of calculation of spectrum requirements for the AMS(R)S communications in the 1.5/
44、1.6 GHz bands 1 General 1.1 Introduction Through RR No. 5.357A, priority shall be given to accommodating the spectrum requirements of the AMS(R)S satellite networks providing transmission of messages with priority 1 to 6 in RR Article 44. This Annex contains a methodology which may be used to determ
45、ine the AMS(R)S spectrum requirements per beam per satellite for AMS(R)S communications. It should be noted that VHF air/ground/air links are used regularly to provide aeronautical communications services where available but for areas beyond line of sight (BLOS), designated HF channels or satellite
46、communications must be employed. This methodology is intended for calculation of AMS(R)S spectrum requirements for areas where VHF links would not be available. The methodology described in this Annex is based on the following steps: 1) determination of the number of AESs (“AES Count”) within a beam
47、; 2) calculation of the information volume generated by these AESs for each of a number of different voice and data carrier types; 3) calculation of the spectrum requirements for various types of carrier in each beam. Rec. ITU-R M.2091-0 5 The methodology also includes steps for the calculation of t
48、he total AMS(R)S spectrum requirements for a network. For the established networks, a methodology based on historical traffic records should provide the most accurate results. Also, where historical information is available, the average traffic per aircraft within each satellite beam can be estimate
49、d from call and data records. This allows any geographic variability in the average traffic per aircraft to be readily estimated. In addition, since relevant historical information for new AMS(R)S systems would not be available in advance of commencement of their operation, established AMS(R)S operators should make available, in a timely manner, at frequency coordination meetings the relevant historical information applicable to the service area of the new AMS(R)S operator, required to determine spectrum requirements for the first year of operation of new systems, using the methodology co
