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ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France ETSI PROJECT TIPHON overview of QoS activities ETSI Workshop on.

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Presentation on theme: "ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France ETSI PROJECT TIPHON overview of QoS activities ETSI Workshop on."— Presentation transcript:

1 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France ETSI PROJECT TIPHON overview of QoS activities ETSI Workshop on Quality Issues for IP Telephony ETSI PROJECT TIPHON overview of QoS activities Mike Buckley Lucent Technologies, UK

2 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Scenarios Scenario 0: IP Terminal (PC) to IP Terminal Scenario 1: IP Terminal to Phone Scenario 2: Phone to IP Terminal Scenario 3: Phone via IP Network to Phone Scenario 4: IP Terminal via SCN to IP Terminal SCN Switched Circuit Network

3 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Scenario 1: IP to SCN Switched Circuit Network IP Network Originator: H.323 Terminal Access Interworking Function Target: SCN Terminal

4 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Scenario 2: SCN to IP Originator: SCN Terminal IP Network Target: H.323 Terminal Access Switched Circuit Network Interworking Function

5 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Scenario 3: SCN to IP to SCN Target: SCN Terminal Originator: SCN Terminal IP Network Switched Circuit Network Switched Circuit Network Interworking Function Interworking Function

6 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Scenario 4: IP to SCN to IP IP Network Access Switched Circuit Network Originator: H.323 Terminal Target: H.323 Terminal Interworking Function Interworking Function

7 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France TIPHON WP5 QoS Activities  Investigate General aspects of QoS in TIPHON IP and hybrid SCN/IP Networks for all TIPHON scenarios.  Define End-to-end QoS Requirements for conversational speech communications over TIPHON networks.  Investigate and define mechanisms for Controlling End-to-end QoS in TIPHON sytems.  Define a model for QoS conformance testing.

8 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France End-to-end QoS TIPHON Classes

9 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Definition of QoS Classes Approach  QoS is defined as mouth to ear as perceived by the user,  End-to-end QoS is defined by a number of quality parameters,  Four classes are defined for each quality parameter.  Three of the classes are guaranteed quality (statistically) and the fourth is unguaranteed (best efforts).

10 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Definition of QoS Classes Classes  BEST: Better than todays PSTN,  HIGH: Equivalent to todays PSTN,  MEDIUM: Equivalent to todays wireless networks,  LOW: Significantly impaired but usable.

11 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Definition of QoS Parameters QoS Parameters  Listening Speech Quality (one-way, non conversational),  End-to-end delay,  Overall Transmission Quality Rating (R),  Call Set-Up Time.

12 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France TIPHON QoS Classes Listening Speech Quality

13 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France TIPHON QoS Classes End-to-end Delay Reference: G.114 One-way Transmission Time

14 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France TIPHON QoS Classes Overall Transmission Quality Rating (R) Reference: G.107 The E-model, a computational model for use in transmission planning

15 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France TIPHON WP5 Next Steps Next Steps  Conformance Testing  Network Planning Guidelines  Definition of QoS Signalling Parameters  Guidance for Implementers

16 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Echo Control  Two types of echo, acoustic echo in terminals and echo in the SCN due to two- four-wire conversion,  Assume echoes arising in terminals are cancelled in terminal and echoes in SCN within SCN or at IP/SCN gateway,  Assume echoes in TIPHON systems are suppressed to low enough levels that they do not impair QoS.

17 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Conformance Testing - Future Work Conformance Testing  Consider how the TIPHON QoS model can be used to define TIPHON QoS conformance tests,  Define clear measurement techniques and measurement resolution,  Investigate the necessity of further tests, such as echo return loss (ERL), to ensure all aspects of the TIPHON QoS framework are met by a system.

18 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Planning Guidelines - Future Work Planning Guidelines  Define / describe planning guidelines for TIPHON networks (Probably E-model based),  Investigate the possibly of extending current techniques to cater for the unique nature of VoIP,  Provide guidance on TIPHON interconnection to other networks.

19 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France QoS Signalling - Future Work QoS Signalling  Define a set of parameters that can be exchanged between terminals/gateways and the network and between network domains that will enable end to end QoS levels to be negotiated between users and service providers,  Define how the QoS budgets relate to the defined parameters,

20 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Guidance for Implementers - Future Work Guidance for Implementers  Provide guidance to network operators, network equipment manufacturers and terminal manufacturers on design criteria for achieving network and terminal performance parameters,  Where appropriate specify default values for terminal and network equipment parameters that directly influence performance,  Investigate reference designs and configurations to be used for testing purposes.

21 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Establishing & Guaranteeing QoS Class across Multiple Administrative Domains

22 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France The Concept of QoS Budgets

23 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France QoS Architecture

24 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Components of a QoS Architecture QoS aware service elements  Gatekeepers (H.323) or other service managers negociate with the service element in terminals/gateways and with their peers,  exchange information with the management layer, to establish the QoS budgets within their domain

25 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France QoS Architecture

26 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Components of a QoS Architecture Management network  Controls resources in the transport network to deliver a given grade of service for packets traversing the transport network.  Operates with the service layer, monitoring and controlling resource within the transport network, and providing resource related information to the service layer.

27 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France QoS Architecture

28 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Components of a QoS Architecture QoS aware transport network  Within this layer, end-to-end delay, delay jitter, packet loss and bandwidth must be controlled to achieve a guaranteed grade of service for packets traversing the network.  Possible mechanisms Diffserv, RSVP, MPLS.

29 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Control Mechanism Assumptions  In each network domain through which the call flows there will be (at least) one gatekeeper or service element responsible for the call.  each gatekeeper has access to the network management system which can control bandwidth, end-to-end delay, delay jitter and packet loss within its domain.

30 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Control Mechanism Approach  Signalling takes place between calling terminal/gateway and access gatekeeper and between gatekeepers at call set-up to negotiate the end-to-end QoS required for that call.  each gatekeeper signals to the network management system within its domain the required QoS parameters.  media packets are marked by the ingress router (or gateway) to indicate the negotiated service class.

31 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Negotiation Mechanism  The approach to the problem is domain to domain.  Either the user signals the desired QoS class to the access gatekeeper or this class is attached to the user's subscription; either way the access gatekeeper knows the desired QoS class for the call.  The first gatekeeper ascertains the required budget for the call within its network domain.  The access gatekeeper deduces the budget left for all remaining stages through which the call will pass and communicates this to the next network domain.

32 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Negotiation Mechanism  The gatekeeper in the next domain then ascertains its required budget, and signals the budget remaining to the next domain.  This process continues until the egress gatekeeper is reached.  The egress gatekeeper then signals confirmation back up the chain of gatekeepers that the requested QoS class can be delivered or that a lower grade of service must be offered.

33 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Approach to QoS Negotiation

34 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Negotiation Mechanism Other Considerations  The access gatekeeper must have information on the quality of the link to the terminal and the terminal class (and hence a priori knowledge of the budget consumed by the terminal and access network).  This egress gatekeeper like the first must have a priori knowledge of the budget consumed by the terminating terminal and its access network.

35 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Control Mechanism Implications  The transport network must be capable of guaranteeing bandwidth allocation, packet loss, end to end delay and delay jitter within its domain.  Media packets will be marked with the QoS class negotiated. Three quaranteed classes and one unguaranteed.  Service management elements must have knowledge of the transport network domains through which the call passes

36 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Proposal for a QoS Control Mechanism Next Steps  Define parameters to be exchanged between sevice layer elements in negotiating QoS class.  Specify extensions to existing call set-up protocols to convey these parameters. e.g. H.225, H.245.  Management layer and transport layer implications.

37 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France Further Information Web site ftp access to documentation WG5 mailing-list

38 ETSI Workshop on Quality Issues for IP Telephony 8-9 June 1999, Sophia Antipolis, France TIPHON QoS Documentation TR v1.3.0 TIPHON; General aspects of Quality of Service DTR/TIPHON-5003 v0.0.0 A signalling system to support TIPHON Quality of Service


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