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Federal Communications Commission Record FCC 90-235

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Federal Communications Commission Record FCC 90-235 5 FCC Red No. 14 Federal Communications Commission Record FCC 90-235 (Comsat) to provide international aeronautical satellite Before the services offered by the International Maritime Satellite Federal Communications Commission Organization (Inmarsat).9 Washington, D.C. 20554 3. In its Second Report and Order in Gen. Docket Nos. 84-1231, 84-1233 84-1234, 51 Fed. Reg. 37389 (1986) the Commission allocated 9 megahertz to AMSS(R) on a pri­ mary basis with MSS secondary. An additional 18 PR Docket No. 90-315 megahertz was allocated to AMSS(R) and MSS on a co­ primary basis, with a condition giving AMSS(R) priority In the Matter of and real-time preemptive access to the full spectrum.10 The Commission stated that efficient use of spectrum Amendment of Part 87 of the supported sharing of spectrum between services rather Commission's Rules to than dividing the spectrum into separate blocks as called for by the 1987 Mobile WARC. 11 The Commission con­ Establish Technical Standards cluded that the sharing arrangement reflected in these and Licensing Procedures for allocations struck a proper balance between AMSS(R) and Aircraft Earth Stations MSS requirements because it was spectrally efficient and would encourage rapid and economical development of both services. 12 NOTICE OF PROPOSED RULE MAKING 4. The Commission also upheld its previously estab­ lished domestic MSS licensing policies and procedures for Adopted: June 14, 1990; Released: July 3, 1990 the 1545-1558.5 MHz and 1646.5-1660 MHz bands and directed MSS applicants to amend their applications to By the Commission: comply with those policies. 13 The effect of these actions was to affirm the Commission's authority to direct the applicants to establish a consortium that would be li­ I. INTRODUCTION censed to construct and operate the MSS system. 1. In this Notice of Proposed Rule Making (NPRM), we 5. In the third of its actions in Docket 84-1234, the propose to amend Part 87 of our rules pertaining to Commission authorized the consortium. American Mobile aircraft earth station equipment technical standards and Satellite Corporation (AMSC),14 to construct. launch, and licensing procedures. 47 C.F.R. Part 87. These amend­ operate the first generation domestic MSS system. 15 The ments will provide for the development of aircraft earth Commission authorized AMSC to develop a combined station (AES) equipment for aeronautical use in mobile MSS-AMSS(R) system in accordance with the domestic satellite operations. This NPRM is initiated sua sponte to allocation16 upheld in a concomitant .Hemorandum Opin­ 1 implement decisions made in several previous Commis­ ion and Order - and required the consortium to incor­ 1 sion actions ( "L-Band proceedings") whereby spectrum porate reasonable and necessary AMSS( R) technical was allocated and initial licensing parameters were estab­ requirements and system specifications_!>' 2 lished to provide for the Mobile Satellite Service (MSS). 6. Two overarching issues in the L-band MSS-AMSS(R) Specifically. we propose to adopt technical standards for proceedings were interoperability and priority and pre­ aircraft mobile terminals used for both MSS and emptive access for AMSS(R) communications in accor­ 3 AMSS(R) communications and corollary licensing pro­ dance with US footnote 308. In authorizing AMSC and cedures. Comsat to provide AMSS(R). the Commission required each party's orerations to satisfy these special allocation requirements.' These issues arise in part from a satellite II. BACKGROUND system design which incorporates several mobile satellite 2. The Commission recently released five orders that services relaying a variety of voice/data and safe­ collectively resolve many of the issues regarding use of a ty/non-safety communications into a generic MSS that portion the "L-band"4 for a generic mobile satellite ser­ includes AMSS(R).20 Implementation of interoperability vice. Specifically, the Commission issued {1) a .\femoran­ and priority and preemptive access capability is a matter dum Opinion and Order 5 that reaffirmed its allocation of satellite system design. For example. in authorizing scheme for the MSS; (2) a Memorandum Opinion and AMSC to design, construct. and operate the combined Order 6 that upheld the Second Report and Order. Gen. domestic MSS-AMSS(R) system, the Commission iden­ Docket No. 84-1234. 2 FCC Red 485 (1987), by which it tified these matters as issues related to network architec­ established technical and regulatory policies and promul­ ture and design21 and required AMSC to provide a gated licensing policies and procedures for the MSS: and supplementary report within ten months of the release of (3) a .\femorandum Opinion, Order and Authorization 7 by the Authorization Order identifying "issues or problems which the Commission authorized the American Mobile concerning reasonable and necessary AMSS(R) technical Satellite Corporation (AMSC) to construct, launch. and requirements and system specifications." 22 The Commis­ operate the first generation domestic MSS and to operate sion. however, found AMSC's overall system design pro­ as both the MSS and AMSS(R) licensee in the L-band at posal,23 whereby a Network Operation Center (NOC) 1545-1559 MHz and 1646.5-1660.5 MHz. In companion would control all access to and operation of the network orders. the Commission upheld its 1987 order dismissing using a Priority Demand Assignment Multiple Access the application of Aeronautical Radio, Inc. (Arinc) to (PDAMA) component. reasonable. 2 ~ 8 construct a global aeronautical mobile satellite system 7. Nevertheless, the Commission recognized that further and allowed the Communications Satellite Corporation design details regarding, e.g., the NOC. PDAMA, earth stations and mobile terminals and the operational 3933 FCC 90·235 Federal Communications Commission Record 5 FCC Red No. 14 interrelationships between these components would have of life aspects (e. g., air traffic control communications). to be developed.25 Although the Commission recognized the shared environment of the L-band, and the potential that AMSC, as a licensee, is responsible for the overall number of different users (i.e., world wide system). We design of it own satellite system, it also recognized the believe that standards are needed for (1) RF output pow­ role of various groups in the aviation user community, er, (2) modulation, (3) authorized bandwidth, (4) emis­ both domestic and international in developing technical sion limits, and (5) frequency stability. Although we are standards and system operation guidelines for AMSS(R) only proposing standards in these five areas·, we ·request communications.26 Thus, interoperability and priority and comments on other standards that may be needed. preemptive access for AMSS(R) are issues that concern 12. Our specific proposals are outlined below. While we both satellite system operators and the aviation user com­ considered information from a number of different munity. sources,33 the proposed technical standards are based, in 8. This Notice proposes technical standards for the air­ general, upon the work of Special Committee 165 (SC- craft earth station component of the MSS-AMSS(R) 165) of the Radio Technical Commission for Aeronautics ,;ystem. The intent of these proposed standards is to re­ (RTCA). Special Committee 165 is a public committee luce interference potential. We are not now proposing sponsored by the Federal Aviation Administration (FAA). ·,tandards for the aircraft· earth stations to accomplish The FAA has a special interest in the technical require­ interoperability and priority and preemptive access for ments of AMSS(R) radio equipment because of its effect AMSS(R). We invite comments, however, from the space on the safety and regularity of flight. For this reason, we segment providers, such as AMSC and Comsat, and from intend to work closely with the FAA in developing tech­ the aviation community on whether the Commission nical standards for aircraft earth stations. 34 should prescribe standards for inter-operability and prior­ 13. We are proposing modifications to Section 87.131 of ity and preemptive access for aircraft earth stations. In our Rules, 47 C.F.R. § 87.131, which addresses power and particular, we seek comments identifying specific char­ emissions. The proposed maximum power is 60 watts per acteristics that could be prescribed in the Commission carrier, with a maximum Equivalent Isotropic Radiated rules for aircraft earth station design to achieve the stated Power ( EIRP) of 2000 watts per carrier. The EIRP is 27 objectives. For example. IC~\0 and SC 165 of RTCA based upon use of an antenna with a maximum gain of have identified the following characteristics for aircraft approximately 15 dB. We have specified the maximum terminals: (1) the ability to tune to any channel as com­ limit in order to minimize the possibility of interference manded by the NOC. (2) the ability to control the level of due to overload of the satellite transponder. transmitter power, and (3) the ability to turn the transmit­ 14. In the proposed amendment to Section 87.133, 4 7 ter on and off as commanded by the NOC. These and C.F.R. § 87.133. pertaining to frequency tolerance. we other characteristics should be addressed by the have specified a value of 0.2 parts per million. This value commenters. is more stringent than the international requirements for 9. The basis for this Notice was laid in the foregoing aircraft earth station equipment operating in these bands. L-band MSS-AMSS(R) proceedings. Specifically. in para­ This limit would. however, encourage spectrum efficiency graph 102 of the Authorization Order in Gen. Docket and be compatible with the channel spacing being estab­ 84-1234. the Commission stated that, "Mobile terminals to lished by RTCA for aeronautical use of these bands. be located on aircraft, which may be used for both 15. We propose to add three emission types, viz .. G1D, AMSS(R) and MSS (e.g .. APC [aircraft public correspon­ G1E and GlW.
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