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    ITU-T H 248 10-2001 Gateway Control Protocol Media Gateway Resource Congestion Handling Package Series H Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services -.pdf

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    ITU-T H 248 10-2001 Gateway Control Protocol Media Gateway Resource Congestion Handling Package Series H Audiovisual and Multimedia Systems Infrastructure of Audiovisual Services -.pdf

    1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU H.248.10 (07/2001) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS Infrastructure of audiovisual services - Communication procedures Gateway control protocol: Media gateway resource congestion handling package I

    2、TU-T Recommendation H.248.1 O ITU-T H-SEMES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS INFRASTRUCTURE OF AUDIOVISUAL SERVICES General Transmission multiplexing and synchronization Systems aspects Communication procedures Coding of moving video Rela

    3、ted systems aspects SYSTEMS AND TERMINAL EQUIPMENT FOR. -Uf SUPPLEMENTARY SERVICES FOR MULTIMEDIA MOBILITY AND COLLABORATION PROCEDURES OVISI. L SERVICES Overview of Mobility and Collaboration, definitions, protocols and procedures Mobility for H-Series multimedia systems and services Mobile multime

    4、dia collaboration applications and services Security for mobile multimedia systems and services Security for mobile multimedia collaboration applications and services Mobility interworking procedures Mobile multimedia collaboration inter-working procedures H. 1 OO-H. I99 H.200-H.2 19 H.220-H.229 H.2

    5、30-H.239 H.24-H.259 H.260-H.279 H.280-H.299 H.300-H.399 H.450-H.499 H.500-H.509 H.510-H.519 H.520-H.529 H.530-H.539 H.540-H.549 H.5 50-H.5 59 H.560-H.569 For further details, please refer to the list of ITU-T Recommendations. ITU-T Recommendation H.248.10 Gateway control protocol: Media gateway reso

    6、urce congestion handling package Summary This Recommendation describes a package for Media Gateway Resource Congestion Handling for use with the H.248.1 Gateway Control Protocol. As defined in ITU-T Rec. H.248.1, a “package“ is an extension to H.248.1 that supports specific behaviour. NOTE - This Re

    7、commendation has been renumbered. It was formerly known as ITU-T Rec. H.248, Annex M2. Source ITU-T Recommendation H.248.10 was prepared by ITU-T Study Group 16 (2001-2004) and approved under the WTSA Resolution 1 procedure on 29 July 200 1. ITU-T Rec. H.248.10 (07/2001) 1 FOREWORD The International

    8、 Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. 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

    9、 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 the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of I

    10、TU-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 collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is u

    11、sed for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU

    12、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 notice of intellectual pr

    13、operty, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2002 All rights reserved. No part of this publicatio

    14、n may be reproduced, by any means whatsoever, without the prior written permission of ITU. 11 ITU-T Rec. H.248.10 (07/2001) CONTENTS Page 1 Scope . 2 Definitions 3 References . 4 Congestion Handling package 4.1 Properties 4.2.1 MGCongestion . 4.2 Events . 5 Signals . 6 Statistics 7 Procedures . ITU-

    15、T Rec . H.248.10 (07/2001) 1 1 1 2 2 2 iii . ITU-T Recommendation H.248.10 Gateway control protocol: Media gateway resource congestion handling package 1 Scope This Recommendation defines a package that extends the applicability of the H.248.1 Gateway Control Protocol Recommendation. Specifically, t

    16、his Recommendation describes a package for the H.248.1 gateway protocol related to Media Gateway Resource Congestion Handling. With the root termination implementing this package, a gateway is expected to report congestion events to a Media Gateway Controller (MGC). 2 Definitions See ITU-T Rec. H.24

    17、8.1 3 References See ITU-T Rec. H.248.1 4 Congestion Handling package Package Name: CHP PackageID : chp, 0x0029 Description: The package makes it possible for the MG to control its load. The events in this package may be provisioned in the MG. The event in this package may only be applied to the Roo

    18、t termination. Version: 1 Extends: None 4.1 Properties NA 4.2 Events 4.2.1 MGCongestion Event name: MGCon EventID : mgcon, (0x0001) Description: This event occurs when the MG requires that the MGC start or finish load reduction towards the MG or to adjust the Load Reduction Percentage. The event is

    19、ordered by the MGC or provisioned. EventsDescriptor Parameters: None ObservedEventsDescriptor Parameters Parameter Name: Reduction ITU-T Rec. H.248.10 (07/2001) 1 ParameterID: reduction, (0x0001) Type: Integer Possible Values: 0-100 It represents a percentage of the load that the MGC is requested to

    20、 block (reject or deflect). A value of O means that no reduction shall be applied. A value of 100 means that the MGC shall block all load towards the MG that is possible to block. 5 Signals NA 6 Statistics NA 7 Procedures When the MGC receives a load reduction notification it tries to reduce the pro

    21、cessing loads that it creates on the MG according to the parameter value. For example, if the Reduction Percentage is 20 then the MGC shall try to block 20% of the load that it would otherwise (without any reduction) have generated on the MG. It is left to the implementation to decide how the MGC sh

    22、all translate a load reduction of 20% to a certain concrete action. One possible implementation is to reject (or redirect) a percentage of new calls based on 20% of the current calls in the MG. Another possibility is to block 20% of the commands that create new contexts. The MGC is free to support p

    23、riorities by blocking low priority calls (originating normal calls) in the first place when load reduction is requested. If calls of different priority generate very different loads on the MG, and load reduction is implemented by rejecting a certain fraction of the calls, then it is recommended to g

    24、ive each call a weight proportional to the average load it is expected to create. 2 ITU-T Rec. H.248.10 (07/2001) SERIES OF ITU-T RECOMMENDATIONS Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Series- Series P Series Q Se

    25、ries R Series S Series T Series U Series V Series X Series Y Series Z .- Organization of the work of ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and huma

    26、n factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Cable networks and transmission of television, sound programme anG other multimedia signals Protection against interf

    27、erence Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuit

    28、s Specifications_omeasuring-equipment - _I Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems *22160* Printed in Switzerland Geneva, 2002


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