1、 International Telecommunication Union ITU-T E.807TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2014) SERIES E: OVERALL NETWORK OPERATION, TELEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS Quality of telecommunication services: concepts, models, objectives and dependability planning Terms
2、 and definitions related to the quality of telecommunication services Definitions, associated measurement methods and guidance targets of user-centric parameters for call handling in cellular mobile voice service Recommendation ITU-T E.807 ITU-T E-SERIES RECOMMENDATIONS OVERALL NETWORK OPERATION, TE
3、LEPHONE SERVICE, SERVICE OPERATION AND HUMAN FACTORS INTERNATIONAL OPERATION Definitions E.100E.103 General provisions concerning Administrations E.104E.119 General provisions concerning users E.120E.139 Operation of international telephone services E.140E.159 Numbering plan of the international tel
4、ephone service E.160E.169 International routing plan E.170E.179 Tones in national signalling systems E.180E.189 Numbering plan of the international telephone service E.190E.199 Maritime mobile service and public land mobile service E.200E.229 OPERATIONAL PROVISIONS RELATING TO CHARGING AND ACCOUNTIN
5、G IN THE INTERNATIONAL TELEPHONE SERVICE Charging in the international telephone service E.230E.249 Measuring and recording call durations for accounting purposes E.260E.269 UTILIZATION OF THE INTERNATIONAL TELEPHONE NETWORK FOR NON-TELEPHONY APPLICATIONS General E.300E.319 Phototelegraphy E.320E.32
6、9 ISDN PROVISIONS CONCERNING USERS E.330E.349 INTERNATIONAL ROUTING PLAN E.350E.399 NETWORK MANAGEMENT International service statistics E.400E.404 International network management E.405E.419 Checking the quality of the international telephone service E.420E.489 TRAFFIC ENGINEERING Measurement and re
7、cording of traffic E.490E.505 Forecasting of traffic E.506E.509 Determination of the number of circuits in manual operation E.510E.519 Determination of the number of circuits in automatic and semi-automatic operation E.520E.539 Grade of service E.540E.599 Definitions E.600E.649 Traffic engineering f
8、or IP-networks E.650E.699 ISDN traffic engineering E.700E.749 Mobile network traffic engineering E.750E.799 QUALITY OF TELECOMMUNICATION SERVICES: CONCEPTS, MODELS, OBJECTIVES AND DEPENDABILITY PLANNING Terms and definitions related to the quality of telecommunication services E.800E.809Models for t
9、elecommunication services E.810E.844 Objectives for quality of service and related concepts of telecommunication services E.845E.859 Use of quality of service objectives for planning of telecommunication networks E.860E.879 Field data collection and evaluation on the performance of equipment, networ
10、ks and services E.880E.899 OTHER E.900E.999 INTERNATIONAL OPERATION Numbering plan of the international telephone service E.1100E.1199 NETWORK MANAGEMENT International network management E.4100E.4199 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T E.807 (02/2014) i
11、 Recommendation ITU-T E.807 Definitions, associated measurement methods and guidance targets of user-centric parameters for call handling in cellular mobile voice service Summary Call handling is an important aspect of cellular mobile voice service user experience. Call handling is executed end-to-e
12、nd by the access and non-access stratum of the network (i.e., global systems for mobile communications (GSM), code division multiple access (CDMA) or universal mobile telecommunications system (UMTS). To enable regulators and operators measure call handling of a cellular mobile voice service for ben
13、chmarking and compliance, Recommendation ITU-T E.807 defines five parameters, describes the methodology in accessing them, and provides guidance targets. These can benefit a regulator, stakeholder or any interested party to independently measure and report on delivered service user experience. Histo
14、ry Edition Recommendation Approval Study Group Unique ID*1.0 ITU-T E.807 2014-02-13 12 11.1002/1000/12119 _ *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
15、/1000/11830-en. ii Rec. ITU-T E.807 (02/2014) 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 permane
16、nt organ 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, establishe
17、s the 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 standard
18、s are 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 Recomme
19、ndation 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
20、 used 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 Inte
21、llectual 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 recei
22、ved notice 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
23、/. ITU 2014 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 E.807 (02/2014) iii Table of Contents Page 1 Scope 1 2 References. 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in thi
24、s Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 2 6 List of QoE parameters . 2 7 QoE parameters with definitions, measures, guidance targets, guidelines on measurement/evaluation . 3 7.1 Call set-up time (parameter 1 in clause 6) 3 7.2 Stand-alone dedicated control channel congesti
25、on rate (parameter 2 in clause 6) 6 7.3 Traffic channel congestion rate (parameter 3 in clause 6) . 7 7.4 Call drop rate (parameter 4 in clause 6) . 8 7.5 Call completion rate (parameter 5 in clause 6) . 8 8 Signalling procedures in call origination and termination 9 8.1 Network factors influencing
26、SDCCH congestion 9 8.2 Network factors influencing delay in call set-up time 10 8.3 Network factors influencing TCH congestion 10 8.4 Network factors influencing dropped calls . 10 9 Conclusion 10 Bibliography. 11 Rec. ITU-T E.807 (02/2014) 1 Recommendation ITU-T E.807 Definitions, associated measur
27、ement methods and guidance targets of user-centric parameters for call handling in cellular mobile voice service 1 Scope This Recommendation provides an introduction into call handling in cellular mobile voice service systems, but most importantly relates signalling procedures to major key performan
28、ce indicators used in the assessment of voice service handling. Some causative factors that incapacitate mobile networks not to perform at their desired levels in consonance with meeting minimum communication standards in respect of guidance targets are discussed herein. This Recommendation is inten
29、ded to be a key reference document for both mobile network operators and regulators. 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
30、indicated 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
31、-T Recommendations 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 E.800 Recommendation ITU-T E.800 (1994), Terms and definitions related to quality of service and network performance in
32、cluding dependability. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following term defined elsewhere: 3.1.1 quality of service (QoS) ITU-T E.800: The collective effect of service performances, which determine the degree of satisfaction of a user of the service. 3.2 Terms de
33、fined in this Recommendation This Recommendation defines the following terms: 3.2.1 call set-up time or voice service access time: The period of time elapsing from the sending of a complete destination address (target telephone number) to the setting up of a call to the receiving terminal. 3.2.2 sta
34、nd-alone dedicated control channel (SDCCH) or radio resource control (RRC) congestion rate: The probability of failure of accessing a stand-alone dedicated control or radio resource control channel during call set-up. 3.2.3 traffic channel congestion rate or voice service non-accessibility ratio: Th
35、e probability of failure of accessing traffic channel(s) during call connections. 3.2.4 call drop rate or voice service cut-off ratio: The probability of a call terminating without the users action. 3.2.5 call completion rate or voice service retainability ratio: The probability that a call, after b
36、eing successfully set up, has to be maintained during a period of time, ending normally, i.e., according to the users expectation. 2 Rec. ITU-T E.807 (02/2014) 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: BS Base Station BSC Base Station Controller
37、BSIC Base Station Identity Code BTS Base Transceiver Station CDMA Code Division Multiple Access GSM Global Systems for Mobile communications MOC Mobile Originating Call MTC Mobile Terminating Call MS Mobile Station MSC Mobile Switching Centre QoE Quality of Experience QoS Quality of Service RAB Radi
38、o Access Bearer RRC Radio Resource Control SDCCH Stand-alone Dedicated Control Channel TCH Traffic Channel TRX Transceiver UMTS Universal Mobile Telecommunications System 5 Conventions None. 6 List of QoE parameters The following quality of experience (QoE) parameters have been identified as useful
39、metrics for assessing the user experience of cellular mobile voice call handling. Key performance indicators for mobile voice service Parameter 1: call set-up time or voice service access time Parameter 1 is the period of time elapsing from the sending of a complete destination address (i.e., target
40、 telephone number) to the setting up of a call to the receiving terminal. Parameter 2: stand-alone dedicated control channel (SDCCH)/radio resource control (RRC) congestion rate Parameter 2 is defined as the probability of failure of accessing a stand-alone dedicated control or radio resource contro
41、l channel during call set-up. Parameter 3: traffic channel congestion rate or voice service non-accessibility ratio Parameter 3 is defined as the probability of failure of accessing traffic channel(s) during call connections. Rec. ITU-T E.807 (02/2014) 3 Parameter 4: call drop rate or voice service
42、cut-off ratio Parameter 4 is the probability of a call terminating without the users action. Parameter 5: call completion rate or voice service retainability ratio Parameter 5 is defined as the probability that a call, after being successfully set up, has to be maintained during a period of time, en
43、ding normally, i.e., according to the users expectation. 7 QoE parameters with definitions, measures, guidance targets, guidelines on measurement/evaluation Methodology The methodology is based on three basic characteristics: 1. End-to-end measurements Measurements reflect all aspects that impact th
44、e quality of a service. 2. Impartiality Measurements are carried out under equal terms for operators using drive test equipment. Simultaneous measurements of different networks are performed, providing an accurate picture of how the networks perform under the same conditions, same time, at the same
45、locations and with the same parameters, thus making it possible to perform comparative analysis of the observed performances. Measurements are done generically and do not require channel-locking or network-locking. 3. Objectivity Tests are carried out in a totally automatic way, thus eliminating the
46、 subjectivity inherent to human intervention or decision. Measurement profile The measurement profile includes process standardization to guarantee the reliability of the test and the definition of testing parameters, thus making it possible to perform analyses and compare results. Voice calls are p
47、erformed in a series of two attempts within 10 seconds for a delay of 10 seconds between series. A successful call is to last a maximum of 60 seconds and has to be completed in a window of 90 seconds. The minimum time required for a call set up before the end of a call window is 30 seconds. The maxi
48、mum call set-up time is 30 seconds. Guard intervals of 10 seconds are calibrated to ensure effective call clearing. The relationship between mobile originating calls (MOC) and mobile terminating calls (MTC) is 1:1. 7.1 Call set-up time (parameter 1 in clause 6) 7.1.1 Definition Call set-up time is t
49、he period of time elapsing from the sending of a complete destination address (i.e., target telephone number) to the setting up of a call to the receiving terminal. 7.1.2 Explanation on parameter definition Call flow diagrams in Figures 7-1, 7-2 and 7-3 for MOC capture two measurement points, “A1“ and “A2“ for global systems for mobile communications (GSM), code division multiple access (CDMA) and universal mobile telecommunications system (UMTS) respectively. “A1“ is the time when the mobile st
