pdf标准 ITU-T E.712-1992 用户平台话务模型 USER PLANE TRAFFIC MODELLING

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ITU-T E.712-1992 用户平台话务模型 USER PLANE TRAFFIC MODELLING 第 1 页 ITU-T E.712-1992 用户平台话务模型 USER PLANE TRAFFIC MODELLING 第 2 页 ITU-T E.712-1992 用户平台话务模型 USER PLANE TRAFFIC MODELLING 第 3 页 ITU-T E.712-1992 用户平台话务模型 USER PLANE TRAFFIC MODELLING 第 4 页 ITU-T E.712-1992 用户平台话务模型 USER PLANE TRAFFIC MODELLING 第 5 页
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INTERNATIONAL TELECOMMUNICATION UNION CCITT THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING USER PLANE TRAFFIC MODELLING Recommendation E.712 E.712 (10/92) FOREWORD The CCITT (the International Telegraph and Telephone Consultative Committee) is a permanent organ of the International Telecommunication Union (ITU). CCITT is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The Plenary Assembly of CCITT which meets every four years, establishes the topics for study and approves Recommendations prepared by its Study Groups. The approval of Recommendations by the members of CCITT between Plenary Assemblies is covered by the procedure laid down in CCITT Resolution No. 2 (Melbourne, 1988). Recommendation E.712 was prepared by Study Group II and was approved under the Resolution No. 2 procedure on the 30th of October 1992. ___________________ CCITT NOTES 1) In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized private operating agency. 2) A list of abbreviations used in this Recommendation can be found in Annex A. © ITU 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. PAGE BLANCHE Recommendation E.712 Recommendation E.712 (10/92) USER PLANE TRAFFIC MODELLING (1992) 1 Introduction In Recommendation E.711 the user demand is characterized by means of his call demands and by the description of each type of call demand. On the basis of the information provided by this user characterization, Recommendation E.712 derives the values of the traffic parameters required for dimensioning the 1 to 3 layer resources of ISDN user plane. The resources involved by the user plane traffic are: – – resources of ISDN Exchanges: switching networks, packet handlers, etc.; – 2 customer accesses (Basic, Primary and their multiplexes): B- and D-channels; trunk groups. General approach In ISDN, call demands with different connection characteristics can be offered to the same group of resources. Depending on the kind of resources, dimensioning may require to separately characterize the traffic components corresponding to call demands with some different connection characteristics. First, there is a distinction of two main traffic components according to the connection characteristic information transfer mode. Each of these two components (circuit switched and packet switched) may be further split up into new components, according to the other connection characteristics of their call demands. Thus, the approach for the modelling of the traffic offered to a group of resources is: – to identify the call demands which make use of this group of resources; – to identify the connection characteristics which imply the split up of the traffic due to these call demands into traffic components; – to describe and quantify these traffic components by means of a set of parameters derived from those defined in Recommendation E.711. This approach will be followed in § 3 to model the circuit switched traffic and in § 4 for the packet switched traffic. 3 Modelling of circuit switched traffic 3.1 Observations on the concept of group of resources In the first implementations of the ISDN, the number of channels or circuits reserved per call will be the same for both directions of the information flow. This number is given for each call by the direction in which the information transfer rate is higher. In this situation, the B-channels of an ISDN access or the channels (slots) of a trunk group are referred here as a group of resources, with independence of the direction of the information flow. Recommendation E.712 (10/92) 1 In further implementations of the ISDN, when the connection characteristic “Symmetry” of the call pattern takes the values unidirectional or bidirectional asymmetric, the number of channels reserved per call may be different in each direction of the information flow. In this situation, the channels carrying each direction of the information flow have to be separately dimensioned (the final dimensioning being given by the direction in which the required number of channels is higher). Thus, the channels of each direction should be considered, in the context of this Recommendation, as a different group of resources. 3.2 Identification of call demands using a group of resources To identify the call demands using a group

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