Consultation Paper on Quality of Service (QoS) - ICTA

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Proportion of coin and card operated public pay-telephones in working order The proportion of public pay-telephone in full working order i.e. the user is able to make use of the services advertised as normally available. A public pay-telephone that is capable of accepting both coin and card payment should be regarded as not being in working order when it is unable to accept further coins because, for example, the coin box is full. Bill correctness complaint The proportion of bills resulting in a customer complaining about the correctness of a given bill. A bill correctness complaint is an expression of dissatisfaction with a bill received from a customer. The Response Time for Directory Enquiry is also defined under ETSI EG202 057-1 as the duration from the instant when the address information required for setting up a call is received by the network (e.g. recognised on the calling user’s access line) to the instant the human operator or an equivalent voice-activated response system answers the calling user to provide the number information requested. The measures for each of the QoS parameters are also specified in ETSI EG 201 769-1, as reported the following table. Parameter Supply time for intial connection Table A1: Parameters and Measures for fixed telephony services Measure -Time by which the fastest 95 % and 99 % of orders are completed (in elapsed days); - Percentage of orders completed by the date agreed with the customer; Faults rate -Hours for taking orders and stated accuracy for appointments. Faults/access line/year Fault repair time - Time by which the fastest 80 % and 95 % of valid faults on access lines are repaired (in hours) - Percentage repaired on target date for faults on access lines - Time to repair 80 % and 95 %, and %age on target date for all other faults - Hours for reporting faults and stated accuracy for appointments Unsuccessful call ratio Call set-up time Response time for operator services Response time for directory enquiry services Public-pay telephones in working order Bill correctness complaints Percentage for national and international calls (separately) Mean value (in seconds) Time in seconds within which the fastest 95 % of calls are set-up Values should be provided separately for national and international calls. - Mean time to answer - % answered within 20 seconds - Mean time to answer - % answered within 20 seconds % in working order % of bills resulting in a customer complaint ITU-T Recommendation E.721 proposes the following traffic GOS parameters for circuitswitched calls in ISDN (may also be applicable to PSTN). It is to be noted that delays or blocking 29
within the customer premises equipment or subscriber terminal are not part of the following definitions for GOS parameters. Pre-selection delay (overlap sending) Pre-selection delay (overlap sending) is defined as the time interval from the instant the first bit of the SABME message is passed by the calling terminal to the access signalling system until the last bit of the SETUP ACK message is received by the calling terminal. Post-selection delay Post-selection delay (overlap sending) Post-selection delay (overlap sending) is defined as the time interval from the instant the first bit of the INFORMATION message containing the last selection digit is passed by the calling terminal to the access signalling system until the last bit of the first message indicating call disposition is received by the calling terminal (ALERTING message in case of successful call). Post-selection delay (en bloc sending) Post-selection delay (en bloc sending) is defined as the time interval from the instant the first bit of the initial SETUP message containing all the selection digits is passed by the calling terminal to the access signalling system until the last bit of the first message indicating call disposition is received by the calling terminal (ALERTING message in case of successful call). Note1: en-bloc signaling is when complete called number is included in the IAM while overlap signaling is when IAM includes only those digits that are needed for outgoing trunk selection at the next exchange. Note 2: Post-selection delay comprises basically of delays associated with Initial Address Message (IAM), Address Complete Message (ACM) as well as processing delays of exchanges involved [ITU Rec E.723]. Answer signal delay Answer signal delay is defined as the time interval from the instant that the called terminal passes the first bit of the CONNECT message to its access signalling system until the last bit of the CONNECT message is received by the calling terminal. Call release delay Call release delay is defined as the time interval from the instant the first bit of the DISCONNECT message is passed by the user terminal which terminated the call to the access signalling system, until the last bit of the RELEASE message is received by the same terminal (indicating that the terminals can initiate/receive a new call). Probability of end-to-end blocking The probability of end-to-end blocking is the probability that any call attempt will be unsuccessful due to a lack of network resources. It is to be noted that: -Blocking because of lack of B-channels between the customer premises equipment and the network is not part of this definition. -The lack of control plane resources during the call setup phase may also contribute to end-to-end blocking. This aspect is for further study. A.1.2 Target Values for GOS Parameters in Fixed Telephony Service ITU-T Recommendation E.721 specifies some target values for GOS parameters for circuitswitched services. Call set-up delay is expressed as Post Dialling Delay in some standards. In 30
Page 1 and 2: Information & Communication Technol
Page 3 and 4: GUIDELINES ON RESPONDING TO THIS CO
Page 5 and 6: List of Abbreviations ACF ASR ETNO
Page 7 and 8: Table 1: Characteristics distinguis
Page 9 and 10: standard should also contain guidel
Page 11 and 12: Therefore while proposing a definit
Page 13 and 14: quality on international calls. The
Page 15 and 16: ACMA publishes the Quarterly Teleco
Page 17 and 18: 4. PROPOSED QOS MONITORING FRAMEWOR
Page 19 and 20: calling party. Ratio of unsuccessfu
Page 21 and 22: working order i.e. the user is able
Page 23 and 24: Q.5 Do you agree with the proposed
Page 25 and 26: Definition The ratio of successful
Page 27 and 28: Only part of the measurements may b
Page 29: ANNEX A- QUALITY OF SERVICE STANDAR
Page 33 and 34: The ETSI EG 202 057-3 V1.1.1 (2005-
Page 35 and 36: pack in more users on a given bandw
Page 37 and 38: Table A7: Proposed (average) target
Page 39 and 40: Parameter Successful MMS Ratio Comp
Page 41 and 42: ETSI EG 202 009 (2007-01) provides
Page 43 and 44: Unlike ASR, NER excludes the effect
Page 45 and 46: 50 R < 60 Poor Nearly all users di

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