1、 - STD-ITU-T RECMN E0773-ENGL L77b 48b259L Ob2b377 008 N INTERNATIONAL TELECOMMUNICATION UNION lTU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E773 (1 0/96) SERIES E: TELEPHONE NETWORK AND ISDN Quality of service, network management and traffic engineering - Traffic engineering - Mobile networ
2、k traffic eng i nee r i n g Maritime and aeronautical mobile grade of service concept ITU-T Recommendation E.773 (Previously CCIlT Recommendation) STD-ITU-T RECMN E-773-ENGL L77b m LiBh259L Ob2b378 TqLJ D ITU-T E-SERIES RECOMMENDATIONS TELEPHONE NETWORK AND ISDN OPERATION, NUMBERING, ROUTING AND MOB
3、ILE SERVICES INTERNATIONAL OPERATION E. 100-E.229 OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN E.230-E.299 THE INTERNATIONAL TELEPHONE SERVICE UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON- E. 300-E. 329 TELEPHONY APPLICATIONS ISDN PROVISIONS CONCERNING USERS E.330-E.39
4、9 QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING NETWORK MANAGEMENT E.400-E.489 International service statistics E.400-E.409 International network management E.410-E.419 Checking the quality of the international telephone service E.420-E.489 TRAFFIC ENGINEERING E.490-E.799 Measuremen
5、t and recording of traffic Forecasting of traffic Determination of the number of circuits in manual operation E.490-E.505 E. 506-E. 509 E.510-ES19 Determination of the number of circuits in automatic and semi-automatic operation Grade of service Definitions ISDN traffic engineering Mobile network tr
6、affic engineering QU AL I Ty OF TEL E COM M U N I CATI ON S E RVI C E S : CON CE PTS , MOD EL SI OBJECTIVES AND DEPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services Models for telecommunication services Objectives for quality of service and related concep
7、ts of telecommunication services Use of quality of service objectives for planning of telecommunication networks Field data collection and evaluation on the performance of equipment, networks and services E. 520-E. 539 E. 540-E. 599 E.600-E.699 E.700-E.749 E.75-E.799 E. 800-E. 899 E.800-E.809 E.810-
8、E.844 E. 845-E. 859 E.860-E.879 E.880-E.899 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN E-773-ENGL L99b 48bZ591 ObZb379 980 D ITU-T RECOMMENDATION E.773 MARITIME AND AERONAUTICAL MOBILE GRADE OF SERVICE CONCEPT Summary This Recommendation introduces the Grade
9、of Service (GOS) concept for both satellite- and terrestrial-based maritime and aeronautical mobile systems. This Recommendation confines initially the GOS concept to circuit-switched user plane traffic. Signalling traffic issues associated with the user plane traffic are covered under separate Reco
10、mmendations. Source ITU-T Recommendation E.773 was prepared by ITU-T Study Group 2 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 8th of October 1996. STP-ITU-T RECMN E.773-ENGL L79b E 98b257L Ob2b38O bT2 FOREWORD ITU (International Telecommunication Union) is the Unit
11、ed Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing
12、 telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Memb
13、ers of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the exp
14、ression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1997 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopy
15、ing and microfilm, without permission in writing from the ITU. II Recommendation E.773 (10/96) 2 4 5 6 7 8 CONTENTS Scope References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . .
17、 . . . . Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GOS concept . Principles to allocate GOS targets Princi
18、ples to select GOS maritime and aeronautical mobiles and fixed network interconnection parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . History Recommendation E
19、.773 (10/96) Page 1 1 1 2 2 2 3 3 . 111 Recommendation E.773 MARITIME AND AERONAUTICAL MOBILE GRADE OF SERVICE CONCEPT (Geneva, 1996) 1 Scope This Recommendation introduces the Grade of Service (GOS) concept for both satellite- and terrestrial-based maritime and aeronautical mobile systems. Circuit-
20、switched and packet-switched services are provided by these systems. This Recommendation confines initially the GOS concept to circuit-switched user plane traffic. Signalling traffic issues associated with the user plane traffic are covered under separate Recommendations. 2 References The following
21、Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendati
22、on are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The following Recommendations contain material that is either relevant
23、to or provides background for this Recommendation: - ITU-T Recommendation E.220 (1 996), Interconnection of public land mobile networks ITU-T Recommendation E.600 (1 993), Terms and definitions for trafic engineering. CCITT Recommendation E.720 (1 SSS), ISDN Grade of Service concept. ITU-T Recommend
24、ation E.752 ( 1996), Reference connections for trafic engineering of maritime and aeronautical systems. ITU-T Recommendation E.770 (1 993), Land mobile and $xed network interconnection trafic Grade of Service concept. ITU-T Recommendation E.771 (1 996), Network Grude of Service parameters and target
25、 values for circuit-switched public land mobile services. ITU-T Recommendation E.774 (1 996), Network Grude of Service parameters and target values for maritime and aeronautical mobile services. ITU-T Recommendation F. 1 1 O (1 996), Operutional provision for the maritime mobile service. (PLMN). - -
26、 - I l - - - - 3 Definitions Definitions relevant to this Recommendation are contained in Recommendation E.753. Recommendation E.773 (10/96) 1 4 Abbreviations For the purposes of this Recommendation, the following abbreviation is used. GOS Grade of Service 5 GOS concept For maritime and aeronautical
27、 mobile systems, transmission quality of the radio link, user behaviour and spectrum re-use are factors that may impact traffic Grade of Service parameters in a unique way. In turn, the Quality of Service (QOS) experienced by the users is dependent on the defined GOS targets. The key aspects which c
28、haracterize maritime and aeronautical services in a unique way are the mobility on a global scale for maritime service and the high-speed of users movement for the aeronautical service. This contributes to the complexity of the supporting communication infrastructure and the related control actions.
29、 Although future systems may envisage sophisticated radio coverage architecture, such as “spot beam“ and “global beam“ operation, GOS parameters for current systems apply for “global beam“ only. Similarly as with land mobile systems, users can appreciate GOS directly through failure to establish a c
30、onnection due to poor channel quality, deterioration of the transmission quality on and possible cut-off of an established connection. The identified GOS parameters may be utilized to define the GOS targets for different segments of the connection path between a maritime/aeronautical user and the in
31、terfacing network element in the fixed domain. The target values of the GOS parameters shall be set under normal and overload conditions. 6 The principles to allocate GOS targets for connections including a maritime or aeronautical network segment are generally the same as those described in Recomme
32、ndation E.720. Accordingly, GOS target values are initially set end-to-end (user GOS) and subsequently allocated to network segments. In a connection, maritime and aeronautical network segments may replace, from a logical point of view, fixed network counterparts. However, it may not be possible, in
33、 general, for maritime and aeronautical network segments of existing systems to cost-effectively maintain some (or all) of the performance targets set for GOS parameters associated with corresponding fixed network segments. This is consistent with the current perception of maritime and aeronautical
34、users that a service provided via a maritime and aeronautical network, or network segment, can hardly compare on an equal basis with the same service fully provided through the fixed network. A differentiation of the GOS performance targets for specific network segments and in specific situations wi
35、th respect to their fixed network logical counterparts is introduced in principle. The differentiation must, however, guarantee that specific bounds to the end-to-end GOS parameters values are met. In connections comprising both maritime (or aeronautical) and fixed network segments, the allocation o
36、f GOS targets for the fixed network segments shall be the same as for end-to-end fixed network connections. In other words, interconnection of maritime and aeronautical and fixed networks should not impose any requirement for additional performance nor any restriction in the normal operation of the
37、fixed network, in accordance with Recommendation E.220. This enables Principles to allocate GOS targets 2 Recommendation E.773 (10/96) independent design and implementation of functional network elements, both fixed and maritime and aeronautical. Different GOS budgets for the maritime and aeronautic
38、al network may result from different fixed network segment replacements. The elements comprising a connection including maritime or aeronautical network segments are depicted in Figure 1. GOS parameters and target values are defined for the Satellite/Terrestrial Subsystem and the Ground Subsystem, a
39、s introduced in Recommendation E.752. . -_ / 1, Fixed Network j 1 -.-. ._._,_, .,/- . Ground . /- .I.; -_ -.-.*- . . i! ; ,. . - _ % Subsystem ,; _._-/. -. -. .-_ . Maritime/Aeronauticai User TO205590-96 FIGURE 1E.773 Elements in a connection including maritime or aeronautical network segments 7 Pri
40、nciples to select GOS maritime and aeronautical mobiles and fixed network For further study. interconnection parameters 8 History This is the first issue of Recommendation E.773. Recommendation E.773 (10/96) 3 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J
41、Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression General telecommunication statistics General tariff principles Telephone network and IS
42、DN Non-telephone telecommunication services Transmission systems and media Transmission of non-telephone signals Integrated services digital network Transmission of sound-programme and television signals Protection against interference Construction, installation and protection of cables and other el
43、ements of outside plant Maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound-programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminal equipment and protocols for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communication Programming languages Printed in Switzerland Geneva, 1997
