1、 ETSI TR 102 678 V1.2.1 (2011-05)Technical Report Speech and multimedia Transmission Quality (STQ);QoS Parameter Measurementsbased on fixed Data Transfer TimesETSI ETSI TR 102 678 V1.2.1 (2011-05) 2Reference RTR/STQ-00184m Keywords 3G, GSM, network, QoS, service ETSI 650 Route des Lucioles F-06921 S
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8、 102 678 V1.2.1 (2011-05) 3Contents Intellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions, symbols and abbreviations . 6g33.1 Definitions 6g33.2 Symbols 7g33.3 Abbreviations . 7g34 FDTT-QoS G
9、eneral Concept 7g34.1 Concept of FDTT-QoS . 7g34.2 Event diagrams . 8g34.2.1 Diagram of Events for FTP download, active mode . 8g34.2.2 Diagram of Events for FTP download, passive mode . 9g34.2.3 Diagram of Events for FTP upload, active mode 9g34.2.4 Diagram of Events for FTP upload, passive mode .
10、10g34.2.5 Diagram of Events for HTTP download . 10g34.3 Usage recommendation 11g34.4 Relation to QoS parameters 11g35 Direct Services QoS Parameters 11g35.1 File Transfer (FTP) . 11g35.1.1 FDTT-QoS FTP Download|Upload Mean Data Rate kbit/s . 11g35.1.1.1 Abstract Definition 11g35.1.1.2 Abstract Equat
11、ion 11g35.1.1.3 Trigger Points 12g35.1.2 FDTT-QoS FTP Download|Upload Data Transfer Non-Stability % 12g35.1.2.1 Abstract Definition 12g35.1.2.2 Abstract Equation 12g35.1.2.3 Trigger Points 13g35.2 Web Browsing (HTTP) . 13g35.2.1 FDTT-QoS HTTP Mean Data Rate kbit/s 13g35.2.1.1 Abstract Definition 13g
12、35.2.1.2 Abstract Equation 13g35.2.1.3 Trigger Points 14g35.2.2 FDTT-QoS HTTP Data Transfer Non-Stability % . 14g35.2.2.1 Abstract Definition 14g35.2.2.2 Abstract Equation 14g35.2.2.3 Trigger Points 14g36 Summary and conclusion . 14g3History 15g3ETSI ETSI TR 102 678 V1.2.1 (2011-05) 4Intellectual Pr
13、operty Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs);
14、 Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches
15、, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Report (TR) has been produced by ETSI
16、Technical Committee Speech and multimedia Transmission Quality (STQ). Introduction The present document defines QoS parameters and the corresponding measurement and evaluation procedures as a supplement to the ones defined in TS 102 250-2 i.1. For the QoS parameters proposed in this document the ter
17、m Fixed Data Transfer Time QoS (FDTT-QoS) parameters is used. The main purpose of proposing the concept of FDTT-QoS parameters is to fulfil the common request for many QoS measurements to have a limited and regular run time for individual measurement tasks. Due to the wide range of uplink and downli
18、nk throughput in modern mobile communication networks, limited and regular run times cannot be provided when having e.g. fixed object (file) sizes for the measurements. Limited runtime is required to ensure that all measurement tasks are finished before the data window ends, where the term data wind
19、ow is used to define the time period from the start of one data session (containing one or several measurement tasks) to the start of the next data session and the time duration of the data window is set to a constant value. For example a data session consists of 3 measurement tasks - FTP DL, FTP UL
20、 and HTTP. Limited time for each task (e.g. 30 s) ensures, that the data session will be completed in 3 30 s and all tasks (FTP DL, FTP UL and HTTP) will be performed. Regular run time is required to ensure that a minimum percentage of the data window is used for measurements. This document describe
21、s how the requirement of regular and limited runtime can be achieved by using these FDTT-QoS parameters for data measurements, especially for FTP and HTTP data transfers. Advantages of the FDTT-QoS parameters and measurement method: Low variation between minimum and maximum measurement time. This is
22、 important if measurements are done in regular intervals. Required measurement time for slow connections is reduced while maintaining the accuracy for high speed connections. Better distribution of measurements in drive tests. Using FDTT-QoS measurements, the same number of tasks or job executions p
23、er time interval can be achieved regardless of the network access technology. Better resource utilization. To determine the throughput a certain time is required as several processes in the network are time dependent. Thus, a time based measurement concept for throughput measurements has the advanta
24、ge of providing reliable measurement values for fast connections while not wasting network capacity for slow connections. ETSI ETSI TR 102 678 V1.2.1 (2011-05) 5List of QoS parameters from TS 102 250-2 i.1 for which supplement definitions in terms of FDTT-QoS parameters are provided within this docu
25、ment: FTP Download|Upload Mean Data Rate kbit/s; FTP Download|Upload Data Transfer Cut-Off Ratio %; HTTP Mean Data Rate kbit/s; HTTP Data Transfer Cut-Off Ratio %. ETSI ETSI TR 102 678 V1.2.1 (2011-05) 61 Scope The present document defines QoS parameters and the corresponding measurement and evaluat
26、ion procedures as a supplement to the ones defined in TS 102 250-2 i.1. This document discusses the concept of Fixed Data Transfer Time QoS (FDTT-QoS) parameters, their methods and validity rules and describes how the requirement of regular and limited runtime can be achieved by using the FDTT-QoS p
27、arameters for data measurements, especially for FTP and HTTP data transfers. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references,
28、the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of
29、publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. Not applicable. 2.2 Informative references The following referenced documents are not necessary for the application of th
30、e present document but they assist the user with regard to a particular subject area. i.1 ETSI TS 102 250-2: “Speech and multimedia Transmission Quality (STQ); QoS aspects for popular services in mobile networks; Part 2: Definition of Quality of Service parameters and their computation“. i.2 ETSI TS
31、 102 250-5: “Speech and multimedia Transmission Quality Aspects (STQ); QoS aspects for popular services in mobile networks; Part 5: Definition of typical measurement profiles“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definition
32、s given in the ETSI Directives and the following apply: Fixed Data Transfer Time QoS (FDTT-QoS) parameters: QoS parameters which are defined as supplement to selected QoS parameters from TS 102 250-2 i.1 related to FTP and HTTP NOTE: Under special circumstances FDTT-QoS parameters have some benefits
33、 compared to QoS from TS 102 250-2 i.1. ETSI ETSI TR 102 678 V1.2.1 (2011-05) 73.2 Symbols For the purposes of the present document, the following symbols apply: td Predefined, fixed period of time used for data transfer measurement in the FDTT-QoS concept 3.3 Abbreviations For the purposes of the p
34、resent document, the following abbreviations apply: FDTT-QoS Fixed Data Transfer Time QoS FTP DL File Transfer Protocol - Downlink Direction FTP UL File Transfer Protocol - Uplink Direction FTP File Transfer Protocol HTTP Hyper Text Transfer Protocol QoS Quality of Service RAT Radio Access Channel T
35、CP Transmission Control Protocol 4 FDTT-QoS General Concept 4.1 Concept of FDTT-QoS The concept of the FDTT-QoS family performance indicators is based on measurements of the performance for a predefined time period (td) instead of measurements with defined objects (measurement files) EXAMPLE: For th
36、e measurements of FTP DL not a file with a defined size is used but the duration for downloading data via FTP is defined. After reaching the end of the transfer period (td elapsed), the amount of transferred data and the average throughput is calculated. The family of FDTT-QoS parameters is defined
37、for FTP DL, FTP UL and HTTP. The end of the measurement is defined by reaching the end of the transfer period td. Throughput is calculated as the total number of bytes received at the application level (FTP or HTTP level) during the time interval td. For FTP measurements, files should be used with a
38、 size big enough not to be completely downloaded/uploaded before reaching the end of the transfer period td. For HTTP measurements a measurement web page (e.g. Copernicus) should be downloaded repeatedly until the end of the transfer period td is reachedor alternatively, a file should be downloaded
39、with a size big enough not to be completely downloaded before reaching the end of the transfer period td. With respect to HTTP measurements, the specification given in TS 102 250-5 i.2 should be taken into account. It is recommended to set tdto a value appropriate for the purpose of the measurement,
40、 e.g. to take into consideration the influence of TCP slow start mechanism. When the end of the transfer period tdis reached the connection should be ended gracefully, e.g. using a close command on socket level producing TCP message FIN. The connection should be checked to be still alive at the end
41、of the transfer period td. The reception of any data packet sent by the server on the data connection after the end of the transfer period is a valid indicator that the data connection is still alive. An appropriate timeout of e.g. 3 to 5 multiples of typical RTT in the measured network might be use
42、d while waiting for the desired packet. ETSI ETSI TR 102 678 V1.2.1 (2011-05) 8 When the desired packet has been received or the timeout occurred, the connection should be ended gracefully by using a close command on socket level producing TCP message FIN. A successfully terminated data transfer is
43、considered as a data transfer which is ended within the connection which is checked as alive at the end of the transfer period td. A measurement task where the connection is not alive at the end of the transfer period tdshould not be used for calculating of data transfer rate statistics. For differe
44、nt types of services (FTP DL, FTP UL and HTTP) the start triggers for data transfer are adopted from TS 102 250-2 i.1. However, the amount of transferred data is counted only until the predefined time period td has elapsed since the respective start event. A QoS parameter (download or upload through
45、put) is then calculated as this amount of data (received or sent on application level) divided by the time period td. Diagrams for FTP DL, FTP UL and HTTP are shown within clauses 4.2.1 to 4.2.3. 4.2 Event diagrams 4.2.1 Diagram of Events for FTP download, active mode ServerClientData Control Contro
46、l DataTCP SYNTCP SYN ACKTCP ACKFTP DATATCP FINTCP ACKFTP DATATCP ACKindicator that the data connection is still aliveFigure 1: Diagram of Events for FTP download, active mode, includes both Data transfer start methods A and B ETSI ETSI TR 102 678 V1.2.1 (2011-05) 94.2.2 Diagram of Events for FTP dow
47、nload, passive mode ServerClientData Control Control DataTCP SYNTCP SYN ACKFTP DATATCP FINTCP ACKFTP DATATCP ACKindicator that the data connection is still aliveTCP ACKFigure 2: Diagram of Events for FTP download, passive mode, includes both Data transfer start methods A and B 4.2.3 Diagram of Event
48、s for FTP upload, active mode ServerClientData Control Control DataTCP SYNTCP SYN ACKTCP ACKTCP ACKTCP FINFTP DATATCP ACKindicator that the data connection is still aliveFigure 3: Diagram of Events for FTP upload, active mode, includes both Data transfer start methods A and B ETSI ETSI TR 102 678 V1
49、.2.1 (2011-05) 104.2.4 Diagram of Events for FTP upload, passive mode ServerClientData Control Control DataTCP SYNTCP SYN ACKTCP ACKTCP FINFTP DATATCP ACKindicator that the data connection is still aliveTCP ACKFigure 4: Diagram of Events for FTP upload, passive mode, includes both Data transfer start methods A and B 4.2.5 Diagram of Events for HTTP download ServerClientData DataHTTP GETHTTP DATATCP FINHTTP DATAindicator that the data connection is still aliveFigure 5: Diagram of Eve
