1、CCITT RECMN*E.430 92 m 4862591 0572776 64T m INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING E.430 QUALITY OF SERVICE FRAMEWORK Recommendation E.430
2、i Geneva, 1992 CCITT RECMN*E-430 92 m 4862591 0572977 586 m INTERNAT ONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING E.430 QUALITY OF SERVICE FRAMEWORK Recomm
3、endation E.430 Geneva, 1992 CCITT RECMN*E.430 92 W 4862593 0572978 412 M FOREWORD The CCIT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union 0. CCIT is responsible for studying technical, operating and tariff question
4、s and issuing Recommendations them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCIT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the membe
5、rs of CCIT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation E.430 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 16th of June 1992. CCITT NOTE In this Recommendation, the expressi
6、on “Administration” is used for conciseness to indicate both a telecommunication Administration and a recognized private operating agency. O IT 1992 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photoco
7、pying and microfilm, without permission in writing from the ITU. CCITT RECMN*E.430 92 = 4862591 0572979 359 Recommendation E.430 QU- OF SERVICE FRAMEWORK 1 Introduction A typicai user is not interested in how a particular service is implemented, but he is interested in comparing one service with ano
8、ther in terms of certain universal performance parameters which apply to any service. Quality of Service (QOS) is expressed by parameter which: - - - do not depend on assumptions about the network internal design; are referred to in terms of user-perceivable effects and not by their causes in the ne
9、twork; are described in network independent terms and create a common language understandable by both the user and the provider; take into account all aspects of the service which can be objectively measured at the service access A network provider is concerned with the efficiency and effectiveness
10、of the network. From the network - system development; - network planning; - operation and maintenance. The user orientated QOS parameters provide a valuable framework for network design, but they are not necessarily usable in specifying network performance requirements for particular connections. S
11、imilarly, the network performance (NP) parameters primarily determine the Quality of Service, but they do not, necessarily, describe that quality in a way that is meaningful to users. Both types of parameters are needed, and their values must be related if a network is to be effective in serving its
12、 users. The definition of QOS and Np parameters should make mapping of values clear in cases where there is not a simple one-to-one relationship between them. - point. providers point of view, network performance is best expressed by parameters which give information for: 2 Purpose It is recognise t
13、hat NP parameters make a major contribution to the QOS. The purpose of this Recommendation is to identify a relationship between Quality of Service (QOS) and network performance (NP) parameters. 3 Scope completeness, Quality of Service aspects are considered in the form of a high level 3 x 3 matrix.
14、 This Recommendation covers the technical performance of a connection. For compatibility and 4 Matrix Recommendations covering ail aspects of telecommunications. A matrix has been designed to enable cross correlation between QOS parameters and relevant QOS and NP Recommendation E.430 1 CCITT RECMN*E
15、-430 92 = 4862571 0572980 070 The matrix forms the prime structure for identifying all QOS sources and relationships, relevant to network perfOflEUlce. The intention is that, by cross-reiating the appropriate general identifiers, it will be possible to source the required detailed parameter. The per
16、formance parameters are classified according to the three basic communication functions; access, user information transfer and disengagement, and are described according to speed, accuracy and dependability criteria. Speed is the time-related criterion used to describe the function performance. Accu
17、racy is the criterion that describes the degree of correcmess with which the function is performed. Dependability is the performance criterion that describes the degree of certainty (or surety) with which a function is performed regardless of speed or accuracy, but within a given observation interva
18、l (from Recommen- dation 1.350). CriteriodFunction SPA Connection Set-up E.431 (access) See List A User information transfer E.432 See List D Connection disengagement E.431 (release) See List G Accuracy Dependability E.845 (Rev.1) E.845, E.846 See List B E.432, E.855 (Rev.1) E.850 (Rev.1) See List E
19、 See List C See List F See List H See List I FIGURE 1E.430 High-level 3 x 3 matrix 2 Recommendation E.430 CCITT RECflN*E.430 92 48b2571 0572781 TO? TABLE 1E.430 Recommendations related the entries of the 3 x 3 matrix List A E.431 X.135 1.352 8422 E.427 E.721 List D E.432 X.135 I.35B I.35C I.35P List
20、 G E.431 X. 135 1.352 E.721 List B E.845 (Rev.1) X.136 1.352 E.422 E.424 E.425 E.426 E.427 List E G.821 G.82 E.422 E.424 E.432 E.855 (Rev.1) X.136 I.35B I.35P List H X.136 1,352 List C E.845 E.846 X.136 1.352 List F E.850 (Rev.1) X.136 1.35c r.35 1.35b E.428 List I X.136 1.352 Recommendation E.430 3
