1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Q.3316 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2016) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements and protocols for the NGN Resource control protocols Interface and signalling requirements and spec
2、ification for cross stratum optimization Recommendation ITU-T Q.3316 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
3、.99 CLAUSES 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 SUBSCRIBE
4、R SIGNALLING 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 CONTRO
5、L (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3899 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 Signa
6、lling and 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.3616 Service and session control protoco
7、ls supplementary services based on SIP-IMS Q.3617Q.3639 NGN applications Q.3700Q.3849 TESTING SPECIFICATIONS Q.3900Q.4099 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Q.3316 (02/2016) i Recommendation ITU-T Q.3316 Interface and signalling requirements and specif
8、ication for cross stratum optimization Summary The cross stratum optimization (CSO) function is introduced to support carrier services for instance cloud services efficiently. The CSO function is aware of resource usage across the service stratum and transport stratum and is therefore able to optimi
9、ze control and management of resource usage. Recommendation ITU-T Q.3316 defines interface and signalling aspects to fulfil this function. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Q.3316 2016-02-13 11 11.1002/1000/12699 Keywords Cross stratum optimization, CSO, resour
10、ce control and management function, virtual network for carriers, VNC, vRCMF. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T
11、 Q.3316 (02/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is re
12、sponsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by th
13、e ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collabor
14、ative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
15、mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirement
16、s. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU
17、takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual proper
18、ty, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 All rights reserved.
19、No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Q.3316 (02/2016) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 3.1 Terms defined elsewhere 1 4 Abbreviations and acronyms 1 5 Conventions 3 6 Interfa
20、ce requirements for cross stratum optimization . 3 6.1 Vt reference model . 3 6.2 Functional elements and capabilities 4 7 Signalling requirements for CSO 5 7.1 Query from SRCM-PE to TRCM-PE . 5 7.2 Response from TRCM-PE to SRCM-PE . 5 7.3 Network event and status notification to SRCM-PE 5 8 Procedu
21、res 6 8.1 Resource query . 6 8.2 Transport resource reservation . 6 8.3 Recovery . 7 9 Message specification . 9 9.1 Message specification . 9 9.2 Object specification 13 10 Security consideration 29 Bibliography. 30 Rec. ITU-T Q.3316 (02/2016) 1 Recommendation ITU-T Q.3316 Interface and signalling
22、requirements and specification for cross stratum optimization 1 Scope This Recommendation defines the interface and signalling requirements and specification for cross stratum optimization (CSO) based on the resource control and management architecture defined in ITU-T Y.3014. 2 References The follo
23、wing 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 revision; users of this Recom
24、mendation 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 this Recommendation does not
25、give it, as a stand-alone document, the status of a Recommendation. ITU-T Q.3302.1 Recommendation ITU-T Q.3302.1 (2010), Resource control protocol No. 2 (rcp2) Protocol at the Rp interface between transport resource control physical entities. ITU-T T.50 Recommendation ITU-T T.50 (1992), Internationa
26、l Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) Information technology 7-bit coded character set for information interchange. ITU-T Y.3014 Recommendation ITU-T Y.3014 (2016), Resource control and management function for virtual networks for carriers (vRCMF). IEEE 754 IEEE 7
27、54 (2008), Standard for Binary Floating-Point Arithmetic. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 carrier ITU-T Y.3014. 3.1.2 customer ITU-T Y.3014. 4 Abbreviations and acronyms This Recommendation uses the following abbreviatio
28、ns and acronyms: ACCT protocol connection establishment Accept ASON Automatically Switched Optical Network CLOSE protocol connection establishment Close CRPFE Customer Request Processing Functional Element CSO Cross Stratum Optimization DNS Domain Name System EN Event Notification 2 Rec. ITU-T Q.331
29、6 (02/2016) FE Functional Entity HMAC Hash-based Message Authentication Code IPv4 Internet Protocol version 4 IPv6 Internet Protocol version 6 KA Keep-Alive MIB Management Information Base OAM Operation, Administration, and Maintenance OPEN protocol connection establishment Open OTN Optical Transpor
30、t Network PMFE Profile Mapping Functional Element QoS Quality of Service QREP Query Reply RA Resource Acceptance RCIP Resource Connection Initiation Protocol REJ resource Rejection RLP Resource reLease Response RLR Resource reLease Request RQ Resource Query RR Resource Request RSVP-TE Resource reser
31、vation Protocol Traffic Engineering SRCM-FE Service Resource Control and Management Functional Entity SRCM GFE Service Resource Control and Management Gateway Functional Element SRCM-PE Service Resource Control and Management Physical Entity TCP Transmission Control Protocol TRCM-FE Transport Resour
32、ce Control and Management Functional Entity TRCM GFE Transport Resource Control and Management Gateway Functional Element TRCM-PE Transport Resource Control and Management Physical Entity TRC-PE Transport Resource Control Physical Entity TRMFE Transport Resource Management Functional Element TROFE T
33、ransport Resource Optimization Functional Element TRPFE Transport Resource Provisioning Functional Element TRRFE Transport Resource Repository Functional Element VM Virtual Machine VNC Virtual Network for Carriers vRCMF Resource Control and Management Function for virtual networks for carriers VRMFE
34、 Virtual Resource Management Functional Element VROFE Virtual Resource Optimization Functional Element Rec. ITU-T Q.3316 (02/2016) 3 VRPFE Virtual Resource Provisioning Functional Element VTRFE Virtual Topology Repository Functional Element 5 Conventions None. 6 Interface requirements for cross stra
35、tum optimization A cross stratum optimization (CSO) function follows the resource control and management architecture shown in Figure 6-1 as defined in ITU-T Y.3014 to support a virtual network for carriers (VNC). Figure 6-1 Resource control and management high-level architecture for VNC To accompli
36、sh the CSO function, the service resource control and management functional entity (SRCM-FE) in the service stratum communicates with transport resource control and management functional entity (TRCM-FE) in the transport stratum via Vt. 6.1 Vt reference model In order to describe the signalling requ
37、irements of Vt, service resource control and management physical entity (SRCM-PE) and transport resource control and management physical entity (TRCM-PE) are used. Figure 6-2 shows the reference model for CSO signalling between SRCM-PE and TRCM-PE via Vt. 4 Rec. ITU-T Q.3316 (02/2016) Figure 6-2 Vt
38、signalling reference model The interface Vt allows resource queries from/to the service stratum to/from the transport stratum. It also allows reservation requests from the service stratum to the transport stratum for certain mission-critical applications that demand guaranteed bandwidth reservation
39、with a minimal latency. In addition, Vt can be used to exchange status data for monitoring, control, and management purposes across the strata. 6.2 Functional elements and capabilities 6.2.1 SRCM-PE SRCM-PE is able to receive and process user request to initiate the CSO function. The cross stratum o
40、ptimization is performed based on the collected status of virtual resources (e.g., servers, storage) in the service stratum and the transport resource information received from TRCM-PE. Figure 6-3 shows the SRCM-PE functionality. The SRCM-PE functionality and its relationship with other neighbour fu
41、nctional entities are defined in clause 8.1 of ITU-T Y.3014. Figure 6-3 SRCM-PE functionality 6.2.2 TRCM-PE TRCM-PE receives a service profile/request from SRCM-PE and initiates provisioning of the transport resources (e.g., network elements and related capabilities) to meet the service requirements
42、. Rec. ITU-T Q.3316 (02/2016) 5 TRCM-PE is also able to provide abstract and virtualized information about the transport stratum to SRCM-PE. Figure 6-4 shows the TRCM-PE functionality. The TRCM-PE functionality and its relationship with other neighbour functional entities are defined in clause 8.1 o
43、f ITU-T Y.3014. Figure 6-4 TRCM-PE functionality 7 Signalling requirements for CSO 7.1 Query from SRCM-PE to TRCM-PE SRCM-PE sends a query message to TRCM-PE to get the status of the resources in the transport stratum, with which SRCM-PE is able to do cross stratum optimization calculation. There is
44、 no actual resource reservation and allocation at this stage. SRCM-PE sends a request message to TRCM-PE to set up a new path or modify an existing path in the transport stratum, with which resource reservation and allocation is required. All the requirements, together with the constraints for path
45、reservation, such as bandwidth, latency and scheduling features, need to be specified in the request message. 7.2 Response from TRCM-PE to SRCM-PE TRCM-PE sends a response message to the query message from SRCM-PE to feed back the status of the resources in the transport stratum. TRCM-PE sends a res
46、ponse message to the request message from SRCM-PE to indicate if the request is committed successfully or not. 7.3 Network event and status notification to SRCM-PE The resources, events and status of the network are reported from TRCM-PE to SRCM-PE, e.g., resource outage or connection failure. When
47、an alternative solution is found to satisfy a scheduled transport service after the resource reservation, but before the service initiation, TRCM-PE sends an event notification message to SRCM-PE to provide the alternative solution while reserving the resources for it. The choice between the alterna
48、tive and previous solutions for re-optimization purposes will be determined by SRCM-PE. 6 Rec. ITU-T Q.3316 (02/2016) After receiving the event notification message, SRCM-PE sends a message to TRCM-PE containing the selection of the chosen solution. This message applies only for scheduled transport
49、services. 8 Procedures 8.1 Resource query In order to support optimization across the service stratum and the transport stratum, the former needs to be aware of the abstracted resource information of the underlying transport network. The resource query mechanism can be used to collect such information. The service resource control and management gateway functional element (SRCM GFE) sends a transport resource query message to the transport resource control and management gateway functional
