1、 International Telecommunication Union ITU-T H.248.32TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2013) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: Detailed congestion reporting package Recommendation IT
2、U-T H.248.32 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures
3、 H.240H.259Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audiovisual and multimedia service
4、s H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications a
5、nd services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND, TRIPLE-PL
6、AY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applications and Internet of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV
7、terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discovery up to consumption H.770H.779 Digital Signage H.780H.789 For further details, please refer to the list of
8、 ITU-T Recommendations. Rec. ITU-T H.248.32 (03/2013) i Recommendation ITU-T H.248.32 Gateway control protocol: Detailed congestion reporting package Summary This Recommendation defines a package that allows the media gateway (MG) to report the current state of its resource usage to the media gatewa
9、y controller (MGC). The MGC can, according to its own capabilities, customize the set of resources reported as well as when the reports are provided. The resources that can be reported may be in the form of general resources and/or individual resources, and can represent either hardware or software
10、resources. Based on the resource usage report received from the MG, the MGC may take corrective action to improve the efficiency of the whole system (e.g., re-route calls, reduce possible message intensive audits, throttle calls, etc.). In general, the precise definition of the following resources i
11、s left to implementation. The resources whose usage may be reported with this package include: General Resources of the MG. This includes any resource that impacts the operation of the MG. For example, combined resources including memory and processor occupancy could be reported using this resource
12、type. Digital Signal Processor (DSP) resources. These are resources that provide a variety of functionality for various packetized voice formats, echo cancellation, voice activity detection (VAD), comfort nose generation (CNG), jitter removal, tone generation/detection, etc. Internet Protocol (IP) r
13、esources that transport packets on an IP packet network. For example, this resource could describe the hardware used to provide terminations with the media address type of IP4 or IP6. Asynchronous Transfer Mode (ATM) resources that transport packets on an ATM packet network. For example, this resour
14、ce could describe the hardware used to provide terminations with the media network type of ATM. Other resources mutually recognized by the MG and MGC. These resources are referred to as extension resources within this Recommendation. The MGC can customize the reporting of the MGs resource usage. The
15、 MGC can enable reporting for only those resources upon which it is capable of taking meaningful action. The MGC can also determine at what threshold level(s) the MG sends reports. The threshold levels are specified as a percentage of the resource used. The number of levels reported is also selectab
16、le. The reporting of different resource shortages will allow the MGC to take different preventive actions. This revision incorporates a correction to the Extension Resource text identities. History Edition Recommendation Approval Study Group 1.0 ITU-T H.248.32 2005-01-08 16 2.0 ITU-T H.248.32 2013-0
17、3-16 16 ii Rec. ITU-T H.248.32 (03/2013) 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 or
18、gan 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 a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the
19、 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 down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are
20、 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 administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendati
21、on may contain certain 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
22、 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 attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellect
23、ual Property Right. ITU 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 not received n
24、otice of intellectual property, 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/. IT
25、U 2013 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 H.248.32 (03/2013) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations 1 5 Detailed congestion reporting packag
26、e . 2 5.1 Properties 2 5.2 Events . 3 5.3 Signals 4 5.4 Statistics 4 5.5 Error codes 4 5.6 Procedures 4 Rec. ITU-T H.248.32 (03/2013) 1 Recommendation ITU-T H.248.32 Gateway control protocol: Detailed congestion reporting package 1 Scope This Recommendation defines a package that allows the media ga
27、teway (MG) to report its resource usage to the media gateway controller (MGC), and based on that report, the MGC may take corrective action to improve the efficiency of the whole system. The specific preventive action that the MGC takes in response to receiving a resource usage report is beyond the
28、scope of this Recommendation. The support of this Recommendation is optional. 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 indicat
29、ed were valid. All Recommendations and other references are subject to revision; 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 Reco
30、mmendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control protocol: Version 3. 3 Definitions This Recommendation defines th
31、e following term: 3.1 extension resources: Extension resources provide a way to extend this package. They represent media gateway resources, beyond those explicitly listed in this package, whose meanings are mutually understood (or recognized) by both the MG and the MGC. 4 Abbreviations This Recomme
32、ndation uses the following abbreviations: ATM Asynchronous Transfer Mode CNG Comfort Noise Generation CPU Central Processing Unit DSP Digital Signal Processor IP Internet Protocol MG Media Gateway MGC Media Gateway Controller VAD Voice Activity Detection VMG Virtual Media Gateway VoATM Voice Over AT
33、M VoIP Voice Over Internet Protocol 2 Rec. ITU-T H.248.32 (03/2013) 5 Detailed congestion reporting package Package name: Detailed Congestion Reporting Package ID: dcr (0x0092) Description: This package allows the MG to report its resource usage and the MGC based on that report to treat different ty
34、pes of calls differently and potentially re-route calls. This package is realized on the ROOT termination. Version: 1 Extends: None 5.1 Properties 5.1.1 Resources definitions Property name: General Resources Property ID: gen (0x0001) Description: Current usage level for general resources Type: Integ
35、er Possible values: Non negative percentage Default: None Defined in: TerminationState Characteristics: Read The other properties of this package are defined in exactly the same way. Table 1 includes parameter names and parameter IDs. Note that each resource is defined as both a parameter and an enu
36、meration. Table 1 Resource names Resource name PropertyID/enumerationvalue Text identifier Binary identifier General resources gen 0x0001 DSP resources dsp 0x0002 IP resources ip 0x0003 ATM resources atm 0x0004 Reserved 0x0005 0x0020 Extension resource 1 ext1 0x0021 Extension resource 2 ext2 0x0022
37、Extension resource 32 ext32 0x0040 Rec. ITU-T H.248.32 (03/2013) 3 5.2 Events 5.2.1 Congestion report Event name: Resource utilization reporting event Event ID: conrep (0x0001) Description: This event reports the current state of resource utilization within the media gateway. The event is reported e
38、ither when a threshold is crossed or periodically. Periodic reporting may be provided in the absence of any change in threshold level if the optional report interval is specified. 5.2.1.1 EventsDescriptor parameters 5.2.1.1.1 Resource name Parameter name: Resource Name Parameter ID: eresname (0x0001
39、) Description: The names of the resources that are to be reported using this request ID. Type: Sub-list of Enumeration Optional: No Possible values: See Table 1 Default: None 5.2.1.1.2 Reporting thresholds Parameter name: Reporting Thresholds Parameter ID: rptthresh (0x0002) Description: Sets the re
40、porting thresholds for the resources listed in eresname. The reporting thresholds are specified as a percentage. The list of thresholds consists of a concatenation of thresholds for each resource. Each resource shall begin with a threshold of 0, indicating that a new resource is being specified. For
41、 example, the integer list “0 90 95 0 50 60 70“ defines two sets of thresholds that correspond to the first two resources named in eresname: the first being 90% and 95%, and the second being 50%, 60% and 70%. If only a single set of thresholds is specified, then it applies to all the resources liste
42、d in eresname. Type: Sub-list of integer Optional: No Possible values: Non negative percentage Default: None 5.2.1.1.3 Report interval Parameter name: Report Interval Property ID: rptint (0x0003) Description: The periodic reporting interval in seconds for the resource usage information. A setting of
43、 0 means that no periodic reporting is done. 4 Rec. ITU-T H.248.32 (03/2013) Periodic reporting is done in the absence of any change in threshold level. Type: Integer Optional: Yes Possible values: Non negative number of seconds Default: 0 5.2.1.2 ObservedEventsDescriptor parameters 5.2.1.2.1 Resour
44、ce name Parameter name: Resource Name Parameter ID: oeresname (0x0001) Description: The names of the resources that are being reported. Type: Sub-list of Enumeration Optional: No Possible values: See Table 1 Default: None 5.2.1.2.2 Resource usage Parameter name: Resource Usage ParameterID: resuse (0
45、x0002) Description: The current usage level of the resources listed in oeresname. Type: Sub-list of Integer Optional: No Possible values: Non negative percentage Default: None 5.3 Signals None. 5.4 Statistics None. 5.5 Error codes None. 5.6 Procedures When this package is implemented, the MGC may en
46、able events to report general resource utilization within the MG (for example, CPU utilization) and/or individual resource utilization within the MG (for example, IP/ATM resources, DSP resources, etc.). The MGC can also direct the MG, through the specification of a list of threshold levels, at what
47、percentage values to report the resource usage. The threshold levels can be set individually for each resource. It is left to the MG to determine the meaning of general, DSP, IP and ATM resources used for calculating the level of the percentage used. For example, the MGC could request that the MG Re
48、c. ITU-T H.248.32 (03/2013) 5 provide a report every time general resources utilization exceeds 50%, 80%, and 90% and also when the DSP resources utilization exceeds 70% and 99%. Once the event is enabled, the gateway is expected to report the corresponding resource usage observed any time a thresho
49、ld is crossed (either escalating, or descending). As an option, it is possible for the MG to report a percent usage greater than 100%. For example, this might occur when the MG suddenly loses resource capacity and as a result moves affected traffic to the remaining resources but, in doing so, is now processing traffic above its estimated capacity. By informing the MGC of an usage 100%, the MG allows the MGC to reduce load on the MG. Resource usage levels are reported through events. The event is reported when a threshold is crossed
