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Question 1/SSG - Service and network capability requirements and network architecture

Reasons for the question

The increase of mobile communications has been explosive, and the number of mobile subscribers has surpassed those of traditional communication services in some areas. The increasing desire for accessing services such as those available from Internet on the move has created new fields of services such as "mobile multimedia," etc.

3rd generation mobile systems – IMT-2000 – will be introduced in early of 2000s in the market to realize high speed, high capacity, and global mobility services.

The emergence of multi-operator environments in a number of countries and the increasing liberalization of networks and infrastructure will stimulate an open competitive environment. Such an environment underlines the need for customers to generally expect the same service presentation irrespective of the access and core networks used to deliver such services.

The Virtual Home Environment (VHE) is an environment, which presents the user with a common look and feel interface and service experience regardless of location, terminal type and network. It applies to both mobile and fixed networks, for both circuit switched and packet switched services.

However, users have indicated the desire for faster multimedia services, higher QoS, and consistent service availability, service interoperability, etc. regardless of the types of networks or the location of the user. How to expand network capabilities to support the above service expectations is an important topic for network design.

In order to continue technical work, e.g., protocol design, etc, clear vision for future mobile services and network capability requirements is required to ensure that the direction is correct.

The question

What Services and Network capability requirements, and the long-term architecture are needed to support services and applications beyond IMT-2000?

Task objectives

The major focus of this question is to develop, in close cooperation with relevant organizations within and without ITU, service and network capability requirements for beyond IMT-2000 systems. The task objectives for the question are:

1) Prepare a document summarising the findings of a gap analysis on the current status and trends in customer user needs, technology, market, and standardisation requirements, if any.

First deliverable expected: a technical report ready for approval - 2Q 2002.

2) Develop "IMT-2000 and Beyond" aspects of service capability requirements, including VHE, for realising applications in item 1) above.

First deliverable expected: a draft new Recommendation ready for AAP Consent - 4Q 2002.

3) Develop network capabilities requirements for realizing item 2) service requirements. First deliverable expected: a draft new Recommendation ready for AAP Consent -TBD.

4) Develop the long-term high-level network architecture for beyond IMT 2000 systems.

a) Develop definition of functional entities (FEs) and allocation of functional capabilities to FEs,

b) Develop interfaces model among FEs and a network architecture model of beyond IMT-2000,

First deliverable expected: a draft new Recommendation ready for AAP Consent – TBD.

5) Assist the relevant protocol groups to identify the protocol changes needed to support VHE in a mobile network, which will facilitate services transparency to users across different access networks.

Expected completion: Task completion dates are in accordance with task objectives.


The execution of tasks of this question will require close co-ordination and collaboration with :

  • ITU-T SG 2, 11, 12, 13, 16
  • ITU-R Working Party 8D & 8F (especially WG-Vision)
  • Relevant ITU-D SGs
  • Other relevant organisations including SDOs, IETF, etc.

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Updated : 2002-01-15