Question 17/12 - Performance of IP-based networks
(Continuation of Questions 6/13 and 7/13)
Motivation
As critical communications services increase their reliance on new networking technologies like MPLS, Ethernet over core networks, and NGN, the user-perceived performance of networks is becoming increasingly important. When several network operators work together in providing end-to-end communications, each needs to understand how to achieve the end-to-end performance objectives. Such objectives must be both adequate for the service being offered and feasible based on the available networking technologies.
A framework is needed to guide the development of performance Recommendations for new network capabilities, transmission facilities, and higher layer services/applications (e.g., TCP), including those supported by the emerging and heterogeneous infrastructure. Such a framework is also essential for relating performance Recommendations focused on different protocols or service layers.
Recommendations in force: I.350, I.353, I.355, Y.800, Y.1540, Y.1541, Y.1560,
Y.1561, I.351; I.356, I.357, I.381.
Question
Study items to be considered include, but are not limited to:
MPLS network performance
How many QoS classes will be required by the services intended for MPLS networks?
How will the end-to-end QoS objectives for MPLS-based services be achieved when more than one MPLS network participates in the provision of communications?
To what extent will QoS commitments depend on the existence of MPLS (labelled or PHP) traffic contracts that completely specify the characteristics of the offered MPLS traffic?
- Ethernet network performance
Which layer and portion have end-to-end significance in specifying Ethernet performance?
What reference events will be available to define performance parameters for Ethernet networks?
What performance parameters and statistics should be standardized for such networks?
What QoS levels will be needed by the services supported on Ethernet networks?
How will the end-to-end QoS objectives for Ethernet-based services be achieved when more than one Ethernet network participates in the provision of communications?
To what extent will QoS commitments depend on the existence of Ethernet traffic contracts that completely specify the characteristics of the offered Ethernet traffic?
How will QoS commitments of Ethernet networks be verified?
IP network performance
How will the end-to-end QoS objectives for IP-based services be achieved when more than one IP network participates in the provision of communications?
How will users of IP-based services communicate their need for an IP QoS commitment?
What additional performance objectives for compressed data (e.g. MPEG video, G.72x codec signals) should be specified in Recommendation
Y.1541?
ATM cell transfer performance
Should Table 2/I.356 be updated to include new QoS classes and updated objectives?
How can QoS interworking between networks based on ITU-T Recommendations and networks based on ATM Forum specifications be improved?
How should ATM network availability performance objectives be specified?
Is there a need for a Recommendation on AAL2 performance and availability to complement the traffic characteristic defined in Recommendation I.378.
General and cross-technology performance studies
How should the generic measurement points, reference events, communication functions, performance outcomes, and performance parameters defined in ITU-T Recommendations be supplemented to address new network capabilities (e.g. multipoint connections, multi-connection calls, and modification of connection attributes), new access arrangements (e.g. wireless, satellites (including LEOs), HFC, xDSL), and new services/applications (e.g. interactive multimedia communications, personal and terminal mobility, flexible routing and charging, security, Internet access, and virtual private networks)?
How should performance Recommendations address communications built on heterogeneous networking technologies?
How can the definition or the measurement of delay variation be improved to discriminate between steady-state delay and any gradual or step-wise changes in delay?
How can the transmission error and availability objectives specified for SDH be related quantitatively to performance objectives for carried Ethernet services and to packet layer performance observed in IP networks? This is an area of collaboration with Q10/12.
How should the generic measurement points, reference events, communication
Tasks
Tasks include, but are not limited to:
Draft new Recommendation on MPLS performance parameters.
Draft new Recommendation on MPLS performance objectives.
Draft New Recommendation on hybrid networks performance.
Draft New Recommendation on Ethernet performance.
Additions and updates to Recommendations Y.1540, Y.1541 and Y.1560.
Updates, as appropriate, to Recommendation I.351/Y.801/Y.1501.
Maintenance and updating, as necessary, for Recommendations I.350, I.353 and I.355.
Maintenance and updating, as necessary, for Recommendations I.356, I.357 and I.381.
Relationships
Recommendations: I.350 series, I.371, I.381, I.610, O.191, G.828, Y.1540, Y.1541, Y.1710 and Y.1711.
Questions: 10/12, 16/12, 18/12, 19/12 and 5/13, 7/13
Study Groups:
ITU-T Study Group on services and network operations
ITU-T Study Group on measurement and maintenance
ITU-T Study Group on public data networks
ITU-T Study Group on end-to-end transmission performance
ITU-T Study Group on voice and multimedia performance
ITU-R Study Groups on satellite systems and services
Standardisation bodies fora and consortia:
ITU-R Study Group on radio systems
ATM Forum on performance issues
IETF working groups on performance issues
IEEE 802 LAN/MAN Standards Committee
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