1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU F.701 (1 1/2000) SERIES F: NON-TELEPHONE TELECOMMUNICATION S E RV I CES Audiovisual services Guideline Recommendation for identifying mu I timed ia service requirements ITU-T Recommendation F.701 (Formerly CC
2、ITT Recommendation) ITU-T F-SERIES RECOMMENDATIONS NON-TELEPHONE TELECOMMUNICATION SERVICES II TELEGRAPH SERVICE F. l-F. 19 Operating methods for the international public telegram service The gentex network F.20-F.29 Message switching F.30-F.39 The international telemessage service F.40-F.58 The int
3、ernational telex service F.59-F.89 F .90-F .99 Statistics and publications on international telegraph services Scheduled and leased communication services F. 100-F. 104 Phototelegraph service Mobile services and multidestination satellite services TELEMATIC SERVICES Public facsimile service Teletex
4、service Videotex service MOBILE SERVICE F. 105-F. 1 O9 F.110-F.159 F. 160-F. 199 F.200-F.299 F.300-F.349 II General provisions for telematic services F.350-F.399 MESSAGE HANDLING SERVICES DIRECTORY SERVICES DOCUMENT COMMUNICATION F.400-F.499 F.500-F.549 11 Document communication F.550-F.579 Programm
5、ing communication interfaces II DATA TRANSMISSION SERVICES F.580-F.599 F.600-F.699 ISDN SERVICES F.800-F.849 UNIVERSAL PERSONAL TELECOMMUNICATION F.850-F.899 HUMAN FACTORS F.900-F.999 For further details, please re$m to the list of ITD-T Recommendations. ITU-T Recommendation F.701 Guideline Recommen
6、dation for identifying multimedia service requirements Summary This Recommendation provides guidelines for describing user requirements that are to be used as the basis for constructing new multimedia services. These guidelines are primarily intended to support the Multimedia service development met
7、hodology described in ITU-T Recommendation F.700. However, they can also be used as the basis for a structured dialogue between End-Users and Service Providers in order to arrive at a responsive service solution when applicable ITU-T service Recommendations are not yet available. Source ITU-T Recomm
8、endation F.701 was prepared by ITU-T Study Group 16 (2001-2004) and was approved under the World Telecommunication Standardization Assembly Resolution No. 1 procedure on 17 November 2000. ITU-T F.701 (11/2000) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized A
9、gency in the field of telecommunications. The ITU Telecommunication Standardization Sector (U-T) is a permanent organ of the ITU. The U-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a wor
10、ldwide 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 their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by
11、 the procedure laid down in WTSA Resolution No. 1. In some areas of information technology which fall within U-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate
12、both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The U takes no position concerni
13、ng the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by U members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the U had not received notice of intellectual property, protected by paten
14、ts, 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 mu 2001 All rights reserved. No part of this publication may be reproduced or util
15、ized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing fiom the ITU. 11 ITU-T F.701 (11/2000) CONTENTS 1 2 3 3.1 3.2 3.3 3.4 4 4.1 4.2 4.3 4.4 4.5 5 Scope . Definitions Multimedia service development methodology Application scr
16、ipts Communication capabilities . Middleware service elements Multimedia service Recommendations . Application Scripts . Prose description . Application matrix summary . Harmonization of Application Scripts with other bodies . Introduction . Functional model of an application . Appendix I . Definiti
17、ons Appendix IT . Multimedia medical consultation 11.2 Application Scenario . Full multimedia support capability Restricted multimedia support capability 11.3 Implementation notes II.3.1 Related applications . II.3.2 Associated applications . II.3.3 Security/privacy . II.3.4 Service flexibility . II
18、.3.5 Performance trade-offs II . 1 Prose Description II.2.1 II.2.2 . ITU-T F.701 (11/2000) 1 2 2 2 2 3 3 4 4 4 5 5 5 5 6 6 7 7 7 7 8 8 . 111 ITU-T Recommendation F.701 F.MCS Generic Service Service description process b multimedia service Elements Recommendations - Guideline Recommendation for ident
19、ifying multimedia service requirements - - 1 Scope This Recommendation provides guidelines for describing user requirements that are to be used as the basis for constructing new multimedia services. These guidelines are primarily intended to support the Multimedia service development methodology des
20、cribed in ITU-T Recommendation F.700. However, they can also be used as the basis for a structured dialogue between End-Users and Service Providers in order to arrive at a responsive service solution when applicable ITU-T service Recommendations are not yet available. 2 Definitions For the purpose o
21、f this ITU-T Recommendation the terms defined in Recommendation F.700 will apply. The definitions of some important terms are reproduced in Appendix I for user convenience. 3 Multimedia service development methodology A detailed methodology for developing Multimedia services is described in Recommen
22、dation F.700. Figure 1 provides an overview of this methodology and shows how end-user requirements are inserted into the service development process through the use of Application Scripts. The construction of these Scripts from End-User requirements is described in the remaining clauses of this Rec
23、ommendation. I Middleware I Application scripts - - I F.b I I I Description of communication capabilities Communication Components Figure 1E.701- Multimedia service development methodology ITU-T F.701 (11/2000) 1 3.1 Application scripts An application script is a document that describes the essentia
24、l characteristics of an End-User application so as to facilitate identification and evaluation of the multimedia communication capabilities required to support it. The script, when properly validated, provides the baseline requirements for new multimedia services. The procedure for developing and va
25、lidating application scripts is described in clause 4. 3.2 Communication capabilities Communication capabilities are the fundamental sets of communication tasks, media components and integration mechanisms required to develop the complex spectrum of multimedia services. The procedure for translating
26、 the application script into the required communications capabilities is described in ITU-T Recommendation F.700. Procedures are also identified for launching the development of new communications capabilities when required to more fully support emerging user needs. 3.3 Middleware service elements T
27、he middleware service elements contain all the control features and the processing functions associated with the service. They interact with the various communication capabilities in order to control them or to process the user information. 3.4 Multimedia service Recommendations The translation of a
28、 particular application script into a description of the required multimedia service can be accomplished directly from the basic communication capabilities by utilizing the procedures specified in ITU-T Recommendation F.700. However, this process can be simplified in many cases by recognizing that a
29、 significant number of end-user applications utilize just a few combinations of multimedia communication means. The methodology for describing these generic service architectures in a series of general ITU-T service Recommendations is also described in ITU-T Recommendation F.700. 4 Application Scrip
30、ts 4.1 Introduction An application script describes the essential characteristics of an end-user application in a manner designed to facilitate identification and evaluation of the required multimedia communications support capabilities. This is accomplished by first describing the application from
31、the end users point of view and then translating this description into a form more useful for technical evaluation. The procedures for constructing an application script are described in 4.2 through 4.4. Ideally, an application selected for the scripting process should represent a broad grouping of
32、individual end-user applications which have the same essential functional characteristics and for which there appears to be a need for the development of a new multimedia service, service arrangement or enhanced service capability. Differences between specific applications within this broad grouping
33、 can be represented by the specific values assigned to a particular requirement attribute. Examples are shown in4.4. The procedures for validating the results of the scripting process are described in clause 5. 2 ITU-T F.701 (11/2000) 4.2 Prose description The prose description of an application pro
34、vides a comprehensive statement of its scope and functional characteristics, together with the users expectations for the quality of service. This description is written in a language understandable to the end user, who need not be aware of the technical aspects of the underlying service or supporti
35、ng communications networks. The prose description may be augmented by an application scenario and a set of implementation notes which further describe the application, highlighting those aspects which might otherwise remain unclear. A sample prose description, with associated application scenario an
36、d implementation notes, is provided in Appendix I. 4.3 The functional model provides a pictorial representation of the essential functional elements identified in the prose description. This representation is presented from the perspective of the application, rather than from the supporting service
37、or network, and contains only those elements visible to the end user. Figure 2 provides the functional model for the prose description contained in Appendix II. Functional model of an application T0106080-00 Figure 2E.701- A sample functional model of an application (medical consultation) The princi
38、ple characteristics to be depicted in the model are: the shared information space in which the interaction takes place; the functional role of the major participants; the required supporting information resources; the type and configuration of the various interactions; and the need to interface asso
39、ciated application processes. 0 While there is no standard symbology for constructing the functional model, care should be taken to select a form of presentation that reflects the essential functional elements of the application in a clear and concise way. ITU-T F.701 (11/2000) 3 4.4 Application mat
40、rix An application matrix maps user requirements onto technical functionalities. The principles for developing attribute tables are the following: 1) Application matrices are intended to facilitate the mapping of user needs with technical functionalities in an easily understandable form. 2) Applicat
41、ion matrices enable the evaluation of service functionalities in a systematic and compact form. 3) Application matrices facilitate assessing the importance of functionalities in regard to user needs. Table 1 shows as an example a part of an application matrix: Differential delay between audio and vi
42、deo Table 1E.701- Application matrix template Image repetition rate Image resolution User needs Lip reading (with head view) Sign language 20 picures/s QCIF (178 x 144 pixels) - 20 picures/s CIF (358 x 288 pixels) The fnllnrwino are euamnlec nf fiinrtinnalitiec the annliratinnc marr remiire. IIIV LV
43、IIV I. “a =IV VLxuILIyVv VL LwIVcIVIIuIIcIVv _IV uyy“VucV“v IIIU J IVyIIv. - - cordless communication access; - high resolution image transfer. The development of the matrix requires further study. 4.5 Summary A script may include a prose description, an application scenario, implementation notes an
44、d an application matrix. (or several matrices for different environments or different times in the communication) . Some scripts may contain only part of those elements. shared viewing space for images; 5 Application scripts can be developed by the ITU or by other standards organizations, industry f
45、ora, consortia, user groups or individual end users. An application script, before being used as the basis for launching a new service development or evaluation effort by the ITU-T, should be discussed with the end user community if possible or reasonable. This discussion should take place between t
46、he relevant study groups and those organizations that have been identified as most representative of relevant end user interests, in accordance with ITU-T policies and procedures (see ITU-T Recommendation A.4). Harmonization of Application Scripts with other bodies 4 ITU-T F.701 (11/2000) APPENDIX I
47、 Definitions Definitions taken from ITU-T Recommendation F.700. 1.1 application: An Application is a set of activities performed to respond to the needs of the users in a given situation for purposes such as business, education, personal communication or entertainment. It implies software and hardwa
48、re utilization, could be performed in a fully or partially automatic way and could be accessed locally or remotely. In the last case, it requests use of telecommunication services. 1.2 multimedia MHEG: The term multimedia is an adjective which means relative to two or more media; it must be attached
49、 to a noun which provides the context. For example, multimedia service or application, multimedia terminal, multimedia network and multimedia presentation. 1.3 multimedia application: A Multimedia Application is an application that requests the handling of two or more representation media (information types) simultaneously, which constitute a common information space. Examples are cooperative document editing, long distance meetings, remote surveillance, medical document remote analysis and teletraining. 1.4 multimedia service: Multimedia services are telecommunication s
