1、ITU-R RECMN*SM. SERIES 95 - 4855232 0526726 070 m Rec. ITU-R SM.1131 1 SECTION 1 A: ENGINEERING PRINCIPLES AND TECHNIQUES, INCLUDING COMPUTER-AIDED ANALYSIS FOR EFFECTIVE SPECTRUM MANAGEMENT RECOMMENDATION ITU-R SM. 1 13 1 * FACTORS TO CONSIDER IN ALLOCATING SPECTRUM ON A WORLDWIDE BASIS (Question I
2、TU-R 205/1) (1 995) The ITU Radiocommunication Assembly, considering that the Radio Regulations (RR) specify three “radio Regions” (RR Nos. 392 to 399); that, between the three Regions, there are many differences in allocated services and allocated band limits; a b) c that worldwide allocations can:
3、 - - ease coordination requirements; - simplify the Table of Frequency Allocations; promote equipment availability for international markets and reduce production costs, thus helping to meet the requirements of developing countries in particular; facilitate activities that depend on internationally
4、operable equipment (i.e. flight traffic control); - d) allocations in a specific frequency range need to be delineated, that the factors to consider when evaluating the need for a worldwide allocation versus separate regional recommends that, when evaluating, for a specific frequency range, whether
5、to allocate on a worldwide versus a regional 1 basis. administrations should consider the factors in Annex 1, ANNEX 1 Factors to consider for allocating spectrum on a worldwide basis 1 Introduction Several factors need to be considered when evaluating where worldwide allocations are needed. The fact
6、ors described below should be understood in the context of the time available to achieve a worldwide allocation where differing regional allocations currently exist. In achieving a worldwide allocation, a considerable period of time is required to pian and arrange for the many aspects of changing se
7、rvice allocations or service designations. An orderly approach to implementation of a worldwide allocation, will not only allow technical and operational issues to be resolved, but could permit attrition and obsolescence of equipment. It can minimize service disruption and dislocation, while permitt
8、ing region specific services to continue operation under the proviso that continued operation does not retard the worldwide implementation programme. * This Recommendation should be brought to the attention of Telecommunication Development Study Groups 1 and 2 (ITU-D). ITU-R RECMNaSM- SERIES 95 m 48
9、55222 0526727 TO7 m 2 Rec. ITU-R SM.1131 2 Technical factors Technical factors, predominantly frequency/propagation, and space location must be considered when allocating spectrum. Signals communicating over very long distances due to the propagation characteristics (primarily HF) cannot be localize
10、d as a border coordination issue. Space systems with wide area transmission footprints often require worldwide allocations; however, in some cases, space systems may be capable of varying frequencies based on the direction of transmission or the position of the satellite during transmission. 3 Opera
11、tional factors Certain radio services or types of radio services require allocation on a worldwide basis because the functions that they serve require international mobility of operation and/or interoperability. Some unique operational functions, such as maritime and aeronautical mobile services oft
12、en require worldwide allotment andor channelling plans. Examples of services or types of services generally requiring worldwide allocations include: - - maritime mobile service, - - radioastronomy, - space services, - services below 30 MHz. aeronautical mobile (R) and (OR), safety services (i.e. rad
13、ionavigation, and distress signalling), Other radio systems require worldwide allocations because they provide, or are capable of providing a worldwide service available to all administrations as desired. Some examples, of such systems are: - - the fixed-satellite service, - the radionavigation-sate
14、llite service, - the mobile-satellite service operated by public and private sector telecommunications providers, the land mobile service such as that to be provided by FFLMTS. 4 Economic factors The costs of allocating spectrum on a worldwide basis versus the benefits achieved must be considered. W
15、orldwide allocations may assist in the development of equipment for intemational markets, leading to possible reduction in equipment costs and simplification of the equipment acquisition process. However, frequency re-assignment of existing equipment may not always be possible due to equipment limit
16、ations, or because existing service will be impaired as a result of a required change. Therefore, costs may include such items as the elimination of equipment operating under non-aligned regional allocations and losses to equipment manufacturers heavily invested in associated technology. Technical i
17、mprovements such as frequency synthesizers decrease the costs associated with changing frequencies; however, they also lower the costs associated with different regional allocations such as production inefficiencies and market availability. 5 Other factors The RR and the Table of Frequency Allocatio
18、ns therein permit administrations to deviate from a particular allocation by use of footnotes. Such deviation takes the form of additional or alternative allocations. Although such allocations can be a disruptive influence, they remain an issue of national sovereignty and flexibility. The elimination of regional differences in allocations will not eliminate the existence of such deviations.
