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Question 2/2 – Routing and interworking plan for fixed and mobile networks
(continuation of Q.2/2)


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.


The Question will deal with the issues detailed under Tasks below.


Project number Topics and rationale Target completion date
1 Maintenance of existing E-series Recommendations

Rationale: It is essential to provide required evolution in existing recommendations.

2 Routing for new network applications and technologies

Rationale: Network technologies are being widely extended to include voice, data, video, multimedia, and other services integrated within the NGN. This project will extend the work on the E-Series of Recommendations to identify and recommend routing needs within next generation networks.

3 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.

4 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.

5 Other projects

Rationale: New and/or modified projects will be introduced as needed, as has always been the experience.



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 and performance (e.g., Q.5/2).

Within ITU

  • ITU-T SG3
  • ITU-T SG7
  • ITU-T SG11
  • ITU-T SG13
  • ITU-T SG15
  • ITU-T SG16

With other groups

  • ATM Forum
  • ETSI
  • IETF
  • MPLS/Frame Relay Alliance
  • relevant international forums/organizations.


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Updated : 2009-04-23