>> Study Group 2 : Operational aspects of service provision, networks and performance
Question 2/2 – Routing and Interworking Plan for Fixed and Mobile Networks
- Motivation
With the rapid growth of IP-based networks, it
is increasingly important to ensure that integration of voice, data, video, and
multimedia services on such networks can route and interwork with networks
based on other technologies, particularly TDM-based PSTN networks, ISDN, frame
relay, ATM, and mobile network technologies. Routing methods are currently
being extended to converged network services integrated on a shared network.
Existing routing methods are not adequate to address all the QoS and
performance issues that arise with the extended applications. These issues and
others are critical to be addressed by Q.2/2 in its ongoing work.
During the previous
Study Period progress was made on these issues by Q.2/2 (lead Study
Group/Question on routing) in the form of 9 Recommendations. These Recommendations include the E.360
series of 7 Recommendations on “QoS Routing and Related Traffic Engineering
Methods for IP-, ATM-, and TDM-Based Networks,” and E.361 on “QoS Routing
Support for Interworking of QoS Service Classes Across Routing
Technologies.” With the continuing
growth in new public services, networks, and capabilities, the list of projects
is not expected to diminish. In a competitive global telecommunications
environment, the importance and controversial nature of routing issues often
cause their study to be contentious and lengthy. This is expected to continue into the next Study Period.
- Question
The Question will deal with the issues detailed under
Tasks below.
- Tasks
| Project number
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Topic and rationale
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Target completion date
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1
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Maintenance of existing E-series Recommendations
Rationale: It is essential to provide required evolution in existing recommendations.
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Ongoing
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2
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QoS routing for new network applications and technologies
Rationale: Network technologies are being widely extended to include voice, data, video, multimedia, and other services integrated on a shared network. This project will extend the work on the E.360 Series of Recommendations to identify and recommend QoS routing needs across TDM-, ATM- and IP-based networks. These needs include support for route selection parameters, QoS resource management parameters, routing table management parameters, and addressing parameters. Existing methods are not adequate to address all the QoS resource management and performance issues that arise with the extended applications. Differentiated services for real-time applications such as VoIP are of particular interest. This project will lead to new recommendations on needed QoS routing extensions arising from the new applications and technologies.
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Ongoing
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3
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Multi-layer routing methods for new network applications and technologies
Rationale: Layer 3 routing methods are currently being integrated with Layer 2 optical/WDM transport network routing methods within a common routing control plane implementation. This project will lead to new recommendations on needed Layer 2 and Layer 3 routing extensions arising from these new applications and technologies.
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Ongoing
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4
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Multi-domain routing methods for new network applications and technologies
Rationale: This project will extend the work on the E.361 Recommendation to identify and recommend information exchange needs for routing across TDM-, ATM- and IP-based networks. These needs include support for route selection parameters, QoS resource management parameters, routing table management parameters, and addressing parameters. Implementation of these capabilities will be developed in collaboration with SG 11, IETF, and ATMF.
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Ongoing
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5
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Dynamic routing for mobile networks
Rationale: This project will consider networks where topologies are in motion rather than fixed. It is expected that the change in perspective will lead to new routing architectures, protocols, and methods. This project will provide new recommendations on routing extensions arising from these mobile technologies.
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Ongoing
|
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6
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Routing congestion control
Rationale: State-dependent routing methods that flood link-state and topology information throughout the network are subject to overload and congestive collapse. This project will provide routing congestion control methods and Recommendations to address these issues.
|
Ongoing
|
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7
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Other projects
Rationale: New and/or modified projects will be introduced as needed, as has always been the experience.
|
Ongoing
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- Relationships
4.1 Within Study Group 2
All questions dealing with the definition and characteristics of telecommunication services
for which routing technologies will be utilised, and to also include questions
focusing on a) numbering and addressing plans (e.g., Q.1/2); b) network
management (e.g., Q.5/2); c) network performance (e.g., Q.4/2); d) traffic
engineering (e.g., Q.7/2).
4.2 Within ITU
- ITU-T SG3
- ITU-T SG4
- ITU-T SG7
- ITU-T SG11
- ITU-T SG13
- ITU-T SG15
- ITU-T SG16
4.3 With other groups
- ATM Forum
- ETSI
- IETF
- MPLS/Frame Relay Alliance
- relevant international forums/organizations.
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