ATIS 1000005-2005 Service Description of ETS.pdf

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1、 ATIS-1000005 SERVICE DESCRIPTION OF ETS TECHNICAL REPORT The Alliance for Telecommunication Industry Solutions (ATIS) is a technical planning and standards development organization that is committed to rapidly developing and promoting technical and operations standards for the communications and re

2、lated information technologies industry worldwide using a pragmatic, flexible and open approach. Over 1,100 participants from more than 350 communications companies are active in ATIS 23 industry committees and its Incubator Solutions Program. ATIS-1000005, Service Description of ETS Is an ATIS Stan

3、dard developed by the Signalling, Architecture, and Control (SAC) Subcommittee under the ATIS Packet Technologies and Systems Committee (PTSC). Published by Alliance for Telecommunications Industry Solutions 1200 G Street, NW, Suite 500 Washington, DC 20005 Copyright 2006 by Alliance for Telecommuni

4、cations Industry Solutions All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. For information contact ATIS at 202.628.6380. ATIS is online at . Printed in the United St

5、ates of America. ATIS-1000005 Technical Report for Telecommunications SERVICE DESCRIPTION OF ETS Secretariat Alliance for Telecommunications Industry Solutions Approved February, 2005 Abstract This Technical Report contains a service description of the Emergency Telecommunications Service (ETS). ETS

6、 is intended for use in a variety of networks and provides priority call/session setup capabilities that are used to support emergency response/recovery activities and disaster responders. ETS provides priority connectivity for any authorized user from any originating point in the public network and

7、 to any destination point in the public network. It includes support of priority connectivity and communications across multiple network types (e.g., circuit-switched networks, wireless network/mobile radio access, cable, satellite, or packet-based multi-media networks). ETS provides priority handli

8、ng for all access types, network call setup, and delivery of the call, including priority handling of all associated signaling generated in conjunction with an ETS call (including queries and corresponding responses). This Technical Report includes an overview of ETS, descriptions of ETS from the en

9、d user perspective and in various types of networks. Information flows are included describing the access, intranetwork signaling, and internetwork signaling. A high-level description of security aspects of ETS is also included. ATIS-1000005 ii FOREWORD The Alliance for Telecommunication Industry So

10、lutions (ATIS) serves the public through improved understanding between carriers, customers, and manufacturers. The Packet Technologies and Systems Committee (PTSC) - formerly T1S1 - develops and recommends standards and technical reports related to services, architectures, and signaling, in additio

11、n to related subjects under consideration in other North American and international standards bodies. PTSC coordinates and develops standards and technical reports relevant to telecommunications networks in the U.S., reviews and prepares contributions on such matters for submission to U.S. ITU-T and

12、 U.S. ITU-R Study Groups or other standards organizations, and reviews for acceptability or per contra the positions of other countries in related standards development and takes or recommends appropriate actions. ATIS guidelines specify two categories of requirements: mandatory and recommendation.

13、The mandatory requirements are designated by the word shall and recommendations by the word should. Where both a mandatory requirement and a recommendation are specified for the same criterion, the recommendation represents a goal currently identifiable as having distinct compatibility or performanc

14、e advantages. Suggestions for improvement of this document are welcome. They should be sent to the Alliance for Telecommunications Industry Solutions, PTSC Secretariat, and 1200 G Street NW, Suite 500, Washington, DC 20005. The Signalling, Architecture, and Control (SAC) Subcommittee was responsible

15、 for the development of this document. ATIS-1000005 iii TABLE OF CONTENTS FOREWORD .II 1 SCOPE. 1 2 REFERENCES . 2 3 ABBREVIATIONS AND DEFINITIONS 3 4 END USER VIEW OF THE SERVICE 4 5 NETWORK VIEW OF THE SERVICE. 5 5.1 ETS NETWORK ARCHITECTURE 5 5.1.1 Generic Architecture 5 5.1.2 National Telecommun

16、ications Network Environment 6 5.1.3 Network-to-Network Interface (NNI) Reference Model . 8 5.1.4 Network Architectures 8 5.1.4.1 Circuit-Switched Network . 8 5.1.4.2 Satellite Network. 9 5.1.4.3 Wireless/Mobile Radio Access Network 10 5.1.4.4 IP Cable Network 12 5.1.4.5 Packet-based Multi-media Net

17、work 14 5.1.5 Industry Activities on ETS 19 5.2 SERVICE FUNCTIONALITIES . 19 6 INFORMATION FLOWS . 21 6.1 WIRELESS/MOBILE RADIO ACCESS NETWORK. 22 6.1.1 CDMA/WPSC. 22 6.1.1.1 Origination 22 6.1.1.2 Termination. 23 6.1.2 CDMA/HLR . 24 6.1.2.1 Origination 24 6.1.2.2 Termination. 25 6.1.3 GSM . 25 6.1.

18、3.1 Origination 25 6.1.3.2 Termination. 26 6.2 CIRCUIT SWITCHED NETWORK 26 6.2.1 ISUP. 26 6.2.2 BICC 26 6.2.3 TCAP. 26 6.3 IP CABLE NETWORKS 27 6.4 PACKET-BASED MULTIMEDIA NETWORK . 28 6.4.1 H.248/Megaco 28 6.4.2 SIP . 29 6.4.3 H.323 . 30 6.4.4 BICC 31 6.5 INTERWORKING. 32 6.5.1 Public Switched Tele

19、phone Network (PSTN) Wireless Networks 32 6.5.2 Public Switched Telephone Network (PSTN) IP Cable Networks . 33 6.5.3 Public Switched Telephone Network (PSTN) Packet-based Networks 33 6.5.3.1 SIP. 34 6.5.3.2 H.323 34 7 OPERATIONS, ADMINISTRATION, MAINTENANCE AND PERFORMANCE CONSIDERATIONS. 35 8 GENE

20、RAL SECURITY CONSIDERATIONS 35 8.1 OVERVIEW 35 8.2 PRIMARY SECURITY NEEDS/OBJECTIVES . 35 8.3 GENERAL INTRA-NETWORK SECURITY CONSIDERATIONS. 35 8.4 GENERAL INTER-NETWORK SECURITY CONSIDERATIONS . 36 8.5 ETS SIGNALING AND CONTROL SECURITY EXAMPLE 36 ATIS-1000005 iv TABLE OF FIGURES FIGURE 1: GENERIC

21、ARCHITECTURE MODEL 6 FIGURE 2: MULTIPLE INTERCONNECTED NETWORKS 7 FIGURE 3: NETWORK INTERFACE . 8 FIGURE 4: CIRCUIT-SWITCHED NETWORK 9 FIGURE 5: SATELLITE NETWORK . 10 FIGURE 6: WIRELESS/MOBILE RADIO ACCESS NETWORK. 11 FIGURE 7: IP CABLE NETWORK . 12 FIGURE 8: IP CABLE CALL SIGNALING INTERFACES. 13

22、FIGURE 9: PACKET-BASED NETWORK DIAGRAM H.323 ARCHITECTURE 15 FIGURE 10: PACKET-BASED NETWORK DIAGRAM SIP ARCHITECTURE 16 FIGURE 11: IP-IP INTERCONNECTION MODEL 17 FIGURE 12: PACKET-BASED NETWORK DIAGRAM H.248/MEGACO ARCHITECTURE 17 FIGURE 13: PACKET-BASED NETWORK DIAGRAM BICC ARCHITECTURE 18 FIGURE

23、14: GENERIC CALL/INFORMATION FLOW FOR ETS CALL/SESSION. 22 FIGURE 15: ETS CALL ORIGINATION CDMA . 23 FIGURE 16: ETS CALL ORIGINATION CDMA . 24 FIGURE 17: ETS CALL ORIGINATION GSM. 25 FIGURE 18: TYPICAL CALL ORIGINATION CABLE NETWORK . 27 FIGURE 19: ETS CALL/CONNECTION HANDLING H.248/MEGACO. 29 FIGUR

24、E 20: ETS CALL/CONNECTION HANDLING SIP 30 FIGURE 21: ETS CALL/CONNECTION HANDLING H.323 31 FIGURE 22: ETS CALL/CONNECTION HANDLING BICC. 32 FIGURE 23: END-TO-END ETS SIGNALING AND CONTROL SECURITY EXAMPLE . 36 TABLE OF TABLES TABLE 1: IP CABLE CALL SIGNALING INTERFACES 14 TECHNICAL REPORT ATIS-10000

25、05 Technical Report for Telecommunications Service Description of ETS 1 1 SCOPE This Technical Report (TR) contains a service description of the Emergency Telecommunications Service (ETS). ETS is intended for use in a variety of networks and provides preferential call/session setup capabilities that

26、 are used to support emergency response/recovery activities and disaster responders. ETS provides preferential connectivity for any authorized user from any originating point in the public network and to any destination point in the public network. It includes support of preferential connectivity an

27、d communications across multiple network types (e.g., circuit-switched networks, wireless network/mobile radio access, cable, satellite, or packet-based multi-media networks). ETS includes priority for all access types, network call setup, and delivery of the call. In addition, ETS requires specific

28、 non-call associated signaling and higher priority handling of all related non-call associated signaling. In addition to providing a common service description across multiple types of networks, this TR is intended to provide a snapshot for different network types of: 1. Internetwork interfaces, 2.

29、Network architectures, 3. Information flows, 4. High-level descriptions of the associated protocol and procedures, and 5. Interactions with other services/capabilities (e.g., IEPS, HPC). The specific features of ETS communications include, but are not limited to: 1. Ubiquitous Access: This allows ET

30、S to be accessible by authorized users from any location and any terminal equipment. 2. Selection of multimedia and telephony services: This includes providing the calling party with access to both multimedia and telephony services. This feature is limited within this Technical Report to telephony s

31、ervices. 3. International connectivity where supported by law and agreement: This includes the capability to interconnect to other similar national services as well as the capability to interwork with the International Emergency Preference Scheme (IEPS). 4. Rapid authentication of authorized ETS use

32、rs, early in the call/session setup process and indicated in the forward direction to subsequent networks: This is intended to protect the network from corruption and from intrusion. 5. Security protection of ETS traffic: This includes providing security at least at the level of an ordinary call. 6.

33、 Preferential access to telecommunications facilities: This facilitates delivering a request for ETS service to a network when available access resources are scarce. 7. Preferential establishment of ETS communications through multiple network types. 8. Preferential routing of ETS traffic: This may i

34、nclude features such as queuing for available resources, exemption from certain restrictive network management functions and reservation of some routes specifically for ETS traffic. ATIS-1000005 2 9. Preferential completion of ETS traffic to the destination end user. 10. Optional preemption of non-e

35、mergency traffic (where consistent and compliant with local, national and regulatory provisions, for example, not interfering with E911 calls, etc.). 11. Allowable degradation of service quality requested for an ETS call/session to increase the probability that it will be successfully set up. This f

36、eature does not apply in the PSTN. 12. Allowable degradation of service quality for established traffic to increase the probability that a new ETS call/session will be successfully set up. This feature does not apply in the PSTN. 13. Interchange of critical telecommunications service management info

37、rmation, e.g., to facilitate restoring service levels for ETS traffic on a priority basis. 14. OAM GSM Network Architecture. 2. 3GPP TS 23.228, Technical Specification Group Services and System Aspects; IP Multimedia Subsystem (IMS) Stage 2. Work on Wireless Priority Service (WPS) is underway in the

38、 Third Generation Partnership Project (3GPP) and TIA TR 45.2. Refer to 3GPP TR 22.952, Priority Service Guide (Release 6) and TIA TR 45.2 draft PN-3-0054, WPS Enhancements for CDMA Systems for more details. In addition, studies on the feasibility of interworking between 3GPP systems and Wireless Loc

39、al Area Networks (WLANs) are underway in 3GPP. Refer to 3GPP TR 22.934 V6.2.0 for more details. Similarly, 3GPP2 is in the process of specifying interworking between 3GPP2 systems and WLANs. Refer to draft 3GPP2: X.0028 for more details. Signalling and Bearer Interfaces to other NetworksBSC MSC/VLR

40、HLRSS7BTS Wireless CPE Mobile BTS Mobile BSC BTS MSC/VLR Trunks (circuits) Air Interface SS7 Links BTS Base Transceiver Station BSC Base Station Controller HLR Home Location Register MSC Mobile Switching Center VLR Visited Location Register Figure 6: Wireless/Mobile Radio Access Network Supporting E

41、TS in wireless/mobile networks includes capabilities identified for the PSTN and preferential/priority capabilities in the originating and terminating radio access segments. Specifically, supporting ETS in wireless/mobile networks involves (but is not limited to) the following: 1. Capability to auth

42、enticate and authorize ETS call requests. 2. Capability to identify and signal an ETS call as it is set-up through the network. 3. Use of higher MTP message priority value for SS7 messages to increase the probability of successful message transfer during SS7 signaling network congestion. 11 ATIS-100

43、0005 4. Support for preference/priority schemes in trunking and in the packet-based transport core network. 5. Support for preference/priority schemes for signaling and bearer interactions. 6. Exemption of ETS calls from restrictive network management control to increase probability of successful ca

44、ll completion. 7. Support for preference/priority schemes for originating and terminating radio access. 8. Support for ETS call request queuing for a radio traffic channel, when needed. 9. Optional ETS-specific signals to the end user. 5.1.4.4 IP Cable Network Figure 7: IP Cable Network Figure 7 ill

45、ustrates a generic IP cable network architecture. For details of the components and protocols, refer to SCTE 24-1 2001 (IPCablecom Part 1: Architecture Framework for the Delivery of Time-Critical Services Over Cable Television Networks Using Cable Modems), SCTE 24-3 2001 (IPCablecom Part 3: Network

46、Call Signaling Protocol for the Delivery of Time-Critical Services Over Cable Television Networks Using Cable Modems), SCTE 24-9 2001 (IPCablecom Part 9: Event Message Requirements), SCTE 24-11 2001 (IPCablecom Part 11: Internet Signaling Transport Protocol (ISTP), and SCTE 24-12 2001 (IPCablecom Pa

47、rt 12: Trunking Gateway Control Protocol (TGCP). The Society of Cable Telecommunications Engineers (SCTE) is expected to work on support of ETS in IP cable network. In addition, ITU-T SG 9 is working on support of ETS both within IPCablecom Networks and between IPCablecom networks and other networks

48、 such as the PSTN and the evolving packet-switched networks. 12 ATIS-1000005 The call signaling interfaces associated with Figure 7 are shown in Figure 8 and are briefly described in Table 1. Figure 8: IP Cable Call Signaling Interfaces 13 ATIS-1000005 14 Table 1: IP Cable Call Signaling Interfaces

49、Interface Functional Components Description Pkt-c1 MTA CMS Call signaling messages exchanged between the MTA and CMS using the NCS protocol, which is a profile of MGCP. Pkt-c2 CMS CMS Call signaling messages exchanged between CMSs. The protocol for this interface is undefined. Pkt-c3 CMS SG Call signaling messages exchanged between CMS and SG using the ISTP/TCAP protocol. Pkt-c4 CMS MGC Call signaling messages exchanged between the CMS and MGC. The protocol for this interface is undefined. Pkt-c5 SG MGC Call signaling messages exc