1、 STD*ITU-T RECMN E.731i-ENGL L97b m Li8b257L Ob2b28L b58 m I NTE R NAT I O N AL TEL EC O M M U N I CATI O N U N I O N ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU E.734 SERIES E: TELEPHONE NETWORK AND ISDN Quality of service, network management and traffic engineering - Traffic engineering
2、- ISDN traffic engineering (1 0/96) Methods for allocating and dimensioning Intelligent Network (IN) resources ITU-T Recommendation E.734 (Previously CCITT Recommendation) STD-ITU-T RECMN E-73q-ENGL L77b 9Ab2571 062b2.82 574 ITU-T E-SERIES RECOMMENDATIONS TELEPHONE NETWORK AND ISDN OPERATION, NUMBER
3、ING, ROUTING AND MOBILE SERVICES INTERNATIONAL OPERATION I E. 100-E.229 OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTING IN E.230-E.299 TH E I NT ER NATI ON AL TEL E P H O N E SERVICE TELEPHONY APPLICATIONS UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON- E.300-E.329 Il ISDN PRO
4、VISIONS CONCERNING USERS E.330-E.399 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
5、 ENGINEERING E.490-E.799 Measurement and recording of traffic E.490-E.505 Forecasting of traffic E. 506-E. 509 Determination of the number of circuits in manual operation ES1 0-E.519 Determination of the number of circuits in automatic and semi-automatic operation E.520-E539 Grade of service E.540-E
6、.599 Definitions E.600-E.699 ISDN traffic engineering E.700-E.749 Mobile network traffic engineering E.750-E.799 QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND DEPENDABILITY PLANNING E.800-E.899 Terms and definitions related to the quality of telecommunication services E. 80
7、0-E.809 Models for telecommunication services E.810-E.844 Objectives for quality of service and related concepts of telecommunication E. 845-E.859 services Use of quality of service objectives for planning of telecommunication networks Field data collection and evaluation on the performance of equip
8、ment, networks and services E.860-E.879 E.880-E.899 For further details, please refer to ITU-T List of Recommendations ITU-T RECOMMENDATION E.734 METHODS FOR ALLOCATING AND DIMENSIONING INTELLIGENT NETWORK (IN) RESOURCES Summary This Recommendation provides an overview of typical considerations whic
9、h are useful in network planning for the initial deployment and subsequent growth of networks based on Intelligent Network architectures, including considerations of intenvorking with existing PSTNASDN infrastructures. It addresses methods for analysing network infrastructure requirements and detail
10、ed dimensioning of Intelligent Network nodes to accommodate expected traffic loads for services offered by a given network. Source ITU-T Recommendation E.734 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. STDnITU
11、-T RECMN E.734-ENGL L77b D 48b259L Ob2b284 3b7 FOREWORD ITU (International Telecommunication Union) is the United 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 stud
12、ying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing 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 Gr
13、oups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members 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 n
14、ecessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “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 publi
15、cation 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. Recommendation E.734 (10/96) II I 2 3 4 5 5.1 5.2 6 6.1 6.2 6.3 7 7.1 7.2 8 8.1 8.2 8.3 8.4 8.5 CONTENTS Page Scope References
16、 Definitions Abbreviations . Introduction New traffic engineering factors in Intelligent Networks General approach to dimensioning . Intelligent Network traffic forecasting . General Understanding traffic flows Development of IN service traffic matrices Resource allocation . Introduction Methods for
17、 locating IN specific elements . 7.2.1 Introduction . 7.2.2 Methods for locating SSPs 7.2.3 Methods for locating SCPs 7.2.4 Methods for locating SDPs . 7.2.5 Methods for locating IPS . Dimensioning of Intelligent Networks . Load determination . Resource allocation and element dimensioning . Network
18、modelling . Signalling subnetwork considerations Dimensioning of circuit groups . Dimensioning of network components . 8.5.1 8.5.2 SS No . 7 link dimensioning 8.5.3 Dimensionhg of non-SS No . 7 communication links . 8.5.4 STP dimensioning . 8.5.5 Dimensioning of circuit switching nodes 8.5.6 SCP dim
19、ensioning . 8.5.7 SDP dimensioning . 8.5.8 IP dimensioning . 8.5.9 Other IN specific element dimensioning . Recommendation E.734 (10/96) 1 2 2 3 3 5 6 6 8 9 10 10 11 11 11 13 13 14 14 14 14 14 15 15 15 16 16 16 17 18 18 19 20 . 111 - STD-ITU-T RECMN E-734-ENGL L77b 48b259L Ob2b28b L3T Page 9 Re-dime
20、nsioning procedure 20 Re-dimensioning for introduction of a new IN service . 9.2 Impact on the PSTN 22 9.3 Impact on the signalling network 23 9.4 Impact on the network architecture . 23 9.1 20 10 History 23 iv Recommendation E.734 (10/96) STD-ITU-T RECMN E-73Li-ENGL L97b 98b259L Ob2b287 07b Recomme
21、ndation E.734 METHODS FOR ALLOCATING AND DIMENSIONING INTELLIGENT NETWORK (IN) RESOURCES (Geneva, 1996) 1 Scope This Recommendation provides an overview of typical considerations which are useful in network planning for the initial deployment and subsequent growth of networks based on Intelligent Ne
22、twork (IN) architectures. Because the various relationships between Intelligent Network functional entities can be implemented using different kinds of subnetworks, an important consideration is interworking with existing PSTNASDN infrastructures. Moreover, this Recommendation deals primarily with i
23、mplementations using SS No. 7 signalling subnetworks but does not imply that these are the only implementations. Networks providing IN services may also provide basic PSTNASDN services. Network elements providing IN services may also provide non-IN functions. Dimensioning of IN-structured networks t
24、hus should consider all demands on network elements. Recognizing that appropriate procedures exist for dimensioning the basic PSTN/ISDN, this Recommendation identifies the extra calculation procedures required to address the needs for IN services. Note also that this Recommendation is developed in t
25、he context of IN Capability Set 1. In this Recommendation, references to various networks (including Intelligent Networks and signalling subnetworks) and any implied network boundaries are not intended to have any ownership or regulatory significance. Such issues may have operational implications, b
26、ut such matters are outside the scope of this Recommendation. 2 References The following 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 Rec
27、ommendations and other references are subject to revision: all users of this Recommendation 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 reg
28、ularly published. - - - ITU-T Recommendation E.492 (1 996), Trafic reference period. CCITT Recommendation ES08 (1 992), Forecasting new telecommunication services. CCITT Recommendation ES20 (1 988), Number of circuits to be provided in automatic andor semiautomatic operation, without over-ow facilit
29、ies. CCITT Recommendation ES22 (1 988), Number of circuits in a high-usage group. ITU-T Recommendation E.724 (1 996), GOS parameters and target GOS objectives for IN services. ITU-T Recornmendation E.733 (1 996), Methods for dimensioning resources in Signalling System No. 7 networks. - - - Recommend
30、ation E.734 (1 0/96) 1 - ITU-T Recommendation Q. 1200 (1 993), Q-series intelligent network Recommendation structure. ITU-T Recommendation Q. 1205 (1 993), Intelligent network physical plane architecture. ITU-T Recommendation Q. 12 1 1 (1 993), Introduction to intelligent network Capabilis Set I. IT
31、U-T Recommendation Q. 12 15 (1 999, Physical plane for intelligent network CS-I. - - - 3 Definitions Definitions of Intelligent Network terms can be found in the Recommendations listed in clause 2 - in particular, see Recommendation Q. 12 15 for definitions of the following terms: - Service Switchin
32、g Point (SSP); - Service Control Point (SCP); - - Intelligent Peripheral (IP). Service Data Point (SDP); and 4 Abbreviations For the purposes of this Recommendation the following abbreviations are used. cs- 1 GOS IN IP ISDN ISUP MTP PSTN SCCP SCE SCEF SCF SCP SDF SDP SIB SMAF SMF SP SRF Capability S
33、et 1 Grade of Service Intelligent Network Intelligent Peripheral Integrated Services Digital Network ISDN User Part Message Transfer Part Public Switched Telephone Network Signalling Connection Control Part Service Creation Environment Service Creation Environment Function Service Control Function S
34、ervice Control Point Service Data Function Service Data Point Service Independent Building Block Service Management Access Function Service Management Function Signalling Point Specialized Resource Function SS No. 7 SSF Service Switching Function Signalling System No. 7 2 Recommendation E.734 (10/96
35、) SSP Service Switching Point STP Signalling Transfer Point TCAP Transaction Capabilities Application Part UPT Universal Personal Telecommunication 5 Introduction This clause describes the aims of this Recommendation, which deals with resource allocation and dimensioning methods for Intelligent Netw
36、orks. Resource allocation encompasses the methods for locating IN-specific elements and for partitioning Intelligent Network functionality (such as service logic) among these elements. Dimensioning determines the sizing of network components. In the case of Intelligent Networks, as for the PSTN/ISDN
37、, traffic engineering activities involve the interplay of three factors: performance objectives, traffic forecasts, and resource allocatioddimensioning. Recommendation E.724 deals with GOS parameters and performance objectives; this Recommendation deals with traffic forecasts and resource allocatiod
38、dimensioning. Subclause 5.1 discusses the new traffic engineering considerations needed to address Intelligent Network deployment; subclause 5.2 briefly describes the approach to resource allocatioddimensioning . Clause 6 elaborates on how to assess service loads and message flows in the network. Cl
39、ause 7 discusses the subject of resource allocation in more depth; subclause 7.1 covers the general factors to be considered while subclause 7.2 details particular issues relating to SSPs, SCPs, SDPs, and IPS. Clause 8 discusses various aspects of dimensioning the circuit-switched subnetwork and IN-
40、specific components as well as the supporting signalling subnetwork. Clause 9 provides for each network some general guidelines on re-dimensioning. The intent is to facilitate the exchange of information between network operators and equipment manufacturers - and not to provide an exhaustive analysi
41、s of network planning tools for particular networks and specific IN implementations. 5.1 The deployment of Intelligent Network services introduces some new aspects into traffic engineering. This encompasses PSTNASDN subnetwork issues and the important subject of re-dimensioning. IN-based services ar
42、e normally incremental to existing PSTN/ISDN networks, but traffic engineering and resource allocatioddimensioning for networks offering IN-based services involve several new factors to be considered in planning and managing IN networks. In an Intelligent Network environment, the following factors h
43、ave an impact on traffic models and traffic forecasts: - New traffic engineering factors in Intelligent Networks Distribution of the Busy Hour Call Attempt rate (BHCA) The dimensioning process for IN should take into account that the BHCA for IN services may have characteristics which differ from th
44、ose adopted for PSTN. Some IN services, like Private Virtual Networks, have peaks during normal working hours, while services like Recommendation E.734 (10/96) 3 STD-ITU-T RECMN E-734-ENGL L77b iBb257L Ob2b2.70 bbO Televoting are generally concentrated in the evening. Therefore, it is necessary to a
45、nalyse the distribution of the BHCA in order to derive traffic loads for the dimensioning process. - TrafJic characteristics The characteristics of the distribution of the call arrival process for some IN services may deserve special attention. The Poissonian assumptions adopted for the PSTN may not
46、 apply for all IN services. Also, IN services which may lead to mass calling situations must be carefully considered. - TrafJic loads In the PSTN, the dimensioning of network elements is made based on call attempt rates and average holding times. These values are approximately known and used as inpu
47、t values. In an IN environment, however, the services may have differing degrees of complexity. A simple IN service such as number translation, with high call attempt rate, may have the same impact on the network as a complex service with a relatively low call attempt rate. - Call processing logic W
48、ith IN-based services, call processing logic is no longer provided only by switching nodes acting sequentially on a given call. Instead, call processing logic may be distributed over other nodes such as SCPs and IPS. In general, while the call processing logic may be described independently of the n
49、etwork architecture, planning for the implementation of a given service requires the specification of service logic functions and the assignment, or allocation, of these functions to particular network nodes. Thus, IN-based services generate a new requirement within service design and implementation: namely, allocation of call processing logic to appropriate network nodes. - Call processing data In the same way that IN-based service logic may be distributed over various network nodes, the specific data used by the call processing logic may also be distributed, and will not nece
