1、 International Telecommunication Union ITU-T Q.3902TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2008) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements and protocols for the NGN Testing for NGN networks Operational parameters to be monitored when implementing NGN technical means in p
2、ublic telecommunication networks Recommendation ITU-T Q.3902 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAU
3、SES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNAL
4、LING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC)
5、 Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3999 General Q.3000Q.3029 Network signalling and control functional architecture Q.3030Q.3099 Network data organization within the NGN Q.3100Q.3129 Bearer control signalling Q.3130Q.3179 Signalling an
6、d control requirements and protocols to support attachment in NGN environments Q.3200Q.3249 Resource control protocols Q.3300Q.3369 Service and session control protocols Q.3400Q.3499 Service and session control protocols supplementary services Q.3600Q.3649 NGN applications Q.3700Q.3849 Testing for N
7、GN networks Q.3900Q.3999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Q.3902 (01/2008) i Recommendation ITU-T Q.3902 Operational parameters to be monitored when implementing NGN technical means in public telecommunication networks Summary Recommendation ITU-T Q.
8、3902 describes the main requirements of an NGN monitoring system which could be used on the model networks for NGN technical means testing and as a part of operations support system (OSS) for monitoring operation flows on the existing providers networks. The basic principles of NGN monitoring system
9、 building, the common parameters to be monitored and the requirements for NGN monitoring system usages on the public telecommunication networks are given in this Recommendation. Source Recommendation ITU-T Q.3902 was approved on 23 January 2008 by ITU-T Study Group 11 (2005-2008) under Recommendatio
10、n ITU-T A.8 procedure. Keywords Model networks, monitoring system, next generation networks (NGN), OSS, PSTN, technical means, testing. ii Rec. ITU-T Q.3902 (01/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications,
11、 information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on
12、 a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid do
13、wn in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication
14、 administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory
15、provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attent
16、ion to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others
17、outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent th
18、e latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Q.3902 (01/2008) iii
19、 CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation. 2 4 Abbreviations 2 5 Conventions 3 6 Compatibility issues . 3 7 NGN monitoring system requirements. 3 8 NMS common measured values . 5 8.1 SS7 MS NMS measured values 6 8.
20、2 SIP MS NMS measured values 6 8.3 H.248 MS NMS measured values 7 8.4 IP MS NMS measured values. 7 8.5 Requirements of monitoring NGN management system 7 Bibliography. 8 Rec. ITU-T Q.3902 (01/2008) 1 Recommendation ITU-T Q.3902 Operational parameters to be monitored when implementing NGN technical m
21、eans in public telecommunication networks 1 Scope The concept of NGN ITU-T Y.2001 is an evolutionary tendency in public telecommunication networks development. All stages of NGN evolution could be divided into networks which are realized by PES architecture, which employs interworking between CS and
22、 PS networks and networks whose architecture is based on IMS platform with a wide range of services and different types of content. Independent from the evolutionary state of the networks, network providers need to implement a network monitoring system which can manage the quality of network operati
23、ons and prevent faults. The NGN monitoring system (NMS) has to be built in accordance with the NGN functional model and has to control all protocols implemented by it. For example, the control protocol list may include: services layer (SIP, H.323, H.248, MGCP, etc.), transport layer (MPLS, BGP, EGP,
24、 Diffserv, etc.), and application layer (Diameter, SIP, AAA, Parlay, etc.). Also in accordance with NGN evolution, the NMS could include protocols implemented by CS networks (SS7, DSS1, etc.). NMS could be also used as part of the OSS systems and take part in fault management and in performance mana
25、gement systems b-ITU-T M.3060. The monitored parameters form the fundamental data about the different layers (LLA) of the OSS architecture b-ITU-T M.3060. NMS could control and compare different parameters of protocols and operational interfaces and, in accordance with ITU-T M.3010 could control all
26、 network elements and services. NMS allows the control of not only stand-alone elements, but also of different types of NGN call scenarios and maintenance parameters, which could be useful for QoS testing. As a result, NMS is an important and a basic measurement instrument which must be provided in
27、the NGN network. NMS must be used in the model network in accordance with ITU-T Q.3900 and is a basic requirement for testing of NGN technical means. This Recommendation describes the basic requirements of an NGN monitoring system and allows to understand what parameters have to be controlled by the
28、 NMS. 2 References The following ITU-T 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 r
29、evision; 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 regularly published. The reference to a document within t
30、his Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T M.3010 Recommendation ITU-T M.3010 (2000), Principles for a telecommunications management network. ITU-T Q.752 Recommendation ITU-T Q.752 (1997), Monitoring and measurements for Signalling System No
31、. 7 networks. ITU-T Q.3900 Recommendation ITU-T Q.3900 (2006), Methods of testing and model network architecture for NGN technical means testing as applied to public telecommunication networks. 2 Rec. ITU-T Q.3902 (01/2008) ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. 3
32、Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 model network b-ITU-T Q.3901: A network which simulates the capabilities similar to those available in telecommunication networks; it has a similar architecture and functionality and uses th
33、e same telecommunication technical means. 3.1.2 NGN technical means b-ITU-T Q.3901: The NGN network equipment which serves as a basis for building next generation network solutions, including applications in public telecommunication networks. 3.2 Terms defined in this Recommendation This Recommendat
34、ion defines the following term: 3.2.1 NGN monitoring systems (NMS): A system which is responsible for online (under payload) measurement values of the NGN protocols carried out on the different NGN strata. 4 Abbreviations This Recommendation uses the following abbreviations: AAA Authentication, Auth
35、orization and Accounting ACE Application Creation Environment AS Application Server BS Billing System CS Circuit Switching network GW Gateway GW-LTE Media gateway for Legacy Terminal Equipment IMS IP Multimedia Subsystem IP Internet Protocol LLA Logical Layered Architecture MeS Messaging Server MG M
36、edia Gateway MGC Media Gateway Controller MPLS MultiProtocol Label Switching MS Media Server NMS NGN Monitoring System NGN Next Generation Network NGN-IAD NGN Integrated Access devices NGN-TD NGN Terminal Devices OSS Operations Support System Rec. ITU-T Q.3902 (01/2008) 3 PES PSTN/ISDN Emulation Ser
37、vice PS Packet Switching network PSTN Public Switched Telephone Network SG Signalling Gateway SIP Session Initiation Protocol TM Technical Means TNE Transport Network Environment 5 Conventions None. 6 Compatibility issues None. 7 NGN monitoring system requirements NMS has to be present at all stages
38、 of the NGN evolution. Basically, NMS has to be implemented from a hybrid environment: interworking between CS and PS networks. In this case, networks will include a wide range of different types of technical means. In accordance with ITU-T Q.3900, the set of TM has to include: Call session control
39、system: Media gateway controller (MGC) Proxy server SIP (PS) IP multimedia subsystem (IMS) Voice and signalling transmit system: Media gateway (GW) Signalling gateway (SG) Transport network environment (TNE) Application servers: Application server (AS) Media server (MS) Messaging server (MeS) Applic
40、ation creation environment (ACE) Management and billing system: Management system (MS) Billing system (BS) Access environment: NGN integrated access devices (NGN-IAD) Media gateway for legacy terminal equipment (GW-LTE) From its initial installations, NMS, based on PES architecture, has to include m
41、easurement modes of both CS protocols and PS protocols. As an example, NMS must allow measurement of CS signalling protocols (SS7, DSS1, etc.) and PS signalling protocols (SIP, H.323, H.248, MGCP, etc.) 4 Rec. ITU-T Q.3902 (01/2008) For the second step of the NMS evolution, which is based only on th
42、e IMS architecture, the NMS must implement all kinds of NGN protocols on all NGN functional architecture strata. For example, the set of protocols could include MPLS, BGP, EGP, Diffserv, Diameter, SIP, AAA, Parlay, etc. As a result, all NGN TM in accordance with the NMS evolution would be divided in
43、to two parts: PES NGN TM part Call session control system: Media gateway controller (MGC) Proxy server SIP (PS) Voice and signalling transmit system Management and billing system Access environment: NGN integrated access devices (NGN-IAD) Media gateway for legacy terminal equipment (GW-LTE) IMS NGN
44、TM part Call session control system: IP multimedia subsystem (IMS) Voice and signalling transmit system Application servers Management and billing system Access environment NGN terminal devices (NGN-TD) Each part could include different types of signalling protocols. The main difference between PES
45、NGN TM and IMS NGN TM is the functionality and type of protocols implemented on it. In the PES part, the call session control system is based on the Softswitch technologies. In this case, the common issue of PES is interworking with the legacy TDM networks. The call session control system based on I
46、MS is, on the other hand, responsible for call control between NGN terminal devices. The distribution of signalling protocols by different types of TM, which are monitored by NMS, is shown below. PES NGN TM part Call session control system (H.248, MGCP, SIP, SIP-I, SIP-T, BICC) Voice and signalling
47、transmit system (H.248, MGCP, SIP, SIGTRAN, SS7, R1, R2, DSS1) Management and billing system (AAA, Diameter, SIP) Access environment (MGCP, H.248, H.323, SIP) IMS NGN TM part Call session control system (SIP, SIP-I) Voice and signalling transmit system (SIP, SS7, R1, R2, DSS1) Management and billing
48、 system (AAA, Diameter, SIP) Access environment (SIP) As illustrated, the basic set of protocols must be implemented on the initial phase (PES NGN) of NMS. Rec. ITU-T Q.3902 (01/2008) 5 The next step of NMS evolution includes the other signalling protocols and takes into account the specific signall
49、ing requirements implemented by IMS. The architecture of NMS includes different types of subsystems. Figure 1 shows the basic functional architecture of NMS. The NMS consists of the following subsystems: SS7 monitoring subsystem; SIP protocol monitoring subsystem; H.248 protocol monitoring subsystem; voice (transfer) service level monitoring subsystem; streaming video service level monitoring subsystem; service level agreements performance
