ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II

pdf标准 ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II

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ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II 第 1 页 ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II 第 2 页 ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II 第 3 页 ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II 第 4 页 ITU-T E.713-1992 控制平台话务模型 CONTROL PLANE TRAFFIC MODELLING Study Group II 第 5 页
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INTERNATIONAL TELECOMMUNICATION UNION CCITT E.713 THE INTERNATIONAL TELEGRAPH AND TELEPHONE CONSULTATIVE COMMITTEE TELEPHONE NETWORK AND ISDN QUALITY OF SERVICE, NETWORK MANAGEMENT AND TRAFFIC ENGINEERING CONTROL PLANE TRAFFIC MODELLING Recommendation E.713 (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.713 was revised 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 B. © 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.713 Recommendation E.713 (10/92) CONTROL PLANE TRAFFIC MODELLING (revised 1992) 1 Control plane traffic For the purposes of teletraffic engineering, the control plane traffic load is assumed to be generated by call attempts on the network. These call attempts are part of the call pattern described in Recommendation E.711. This Recommendation considers traffic loads at the lower three layers of the CCITT 7-layer reference models (see Recommendations I.310 and I.320) described for ISDN in Recommendation Q.931 and in Signalling System No. 7. The control plane traffic of an ISDN network includes all the control signals sent through the ISDN network. The types of control signals are: 1) signals for user call attempts a) b) to release the connection paths in the user plane; c) if required, to order additional communication facilities or change of service by the users during the time of user information transfer; d) 2) to set up the connection paths in the user plane (reservation of time slots for circuit switched connections or control for the virtual calls of packet-switched connections); possibly to send charging information during the time of user information transfer. User-to-user information messages1). Because control plane traffic due to user-to-user messages is left for further study, this Recommendation will consider only signals for user call attempts. The control plane traffic uses two types of channels in the network: a) b) 2 the 16 kbit/s or 64 kbit/s D-channels in the user access, and the 64 kbit/s Signalling System No. 7 channels connecting two different signalling points. Signalling traffic The end-to-end ISDN signalling traffic depends on the call pattern arrival process defined in Recommendation E.711 and on the signalling protocol. The basis for the estimation of the signalling traffic is the information given in the Recommendations of the Iand Q-Series dealing with the number and structure of the signals in the D- and Signalling System No. 7 channels for any type of attempt. The total signalling traffic is composed of these signals. The number of signals may be different for each different type of attempt. _______________ 1) The analysis of user-to-user messages in the control plane is left for further study. Recommendation E.713 (10/92) 1 3 Estimation of the signalling traffic for a single call attempt In Figure 1/E.713 the network components supporting the control plane of the ISDN reference connection of Figure 1/E.701 are considered. In each section, a significant point is defined: DA (D-channel, A user side): S/T interface at an A user side DB (D-channel, B user side): S/T interface at a B user side CA (S.S. No. 7 channels, A user side): Outgoing side of the local exchange LE(A). CB (S.S. No. 7 channels, B user side): Incoming side of the local exchange LE(B). S/T TE(A) Significant points: TE(A) LE(A) LE(B) TE(B) D S.S. No. 7 network LE(A) LE(B) D S/T TE(B) T0203630-93 CA DA CB DB Originating terminal equipment Originating local exchange Terminating local exchange Terminating terminal equipment FIGURE 1/E.713 Significant points in the control plane

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