Wireless Future - Telenor

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146 In ITU-T we have seen needs to distinguish between standardisation and • regulatory issues; • radio spectrum and space management; • technology development; and corresponding procedures and financing of these different pieces of work. The new Alternative Approval Process within ITU-T applies to technical Recommendations only, while the Traditional Approval Process applies to Recommendations of a regulatory nature. The current Radio sector (ITU-R) does management of radio spectrum and space as well as standardisation of radio and broadcasting technology; attempts to move the standardisation aspects to ITU-T have failed. The ongoing work on ITU Reform tries to separate technology development from the intergovernmental procedures and financing of ITU. Currently all financial contributions go to ITU as a whole, and are then split on the three sectors, with the Development sector (ITU-D) using the largest portion, then the Radio sector (ITU-R); and the Standardisation sector (ITU-T) receives the smallest portion, even if this is the sector having the largest production – and sector member participation. Sector Members are seeking greater independence for the individual sectors of ITU, especially for the ITU-T, direct financial contributions to this sector only, and they seek greater Sector Member influence on decisionmaking, finances and management. The above provides a complex and confusing picture of international technology development and standardisation. There is a need for better co-ordination between the global standardisation organisations and to the regional organisations. It is my belief that some fora have attracted too much of the attention of the telecommunication operators, and that these operators would benefit from maintaining ITU-T as their main interest organisation. This strategy will require that they continue to carry new work items to ITU-T and to provide their best expertise to develop the solutions. I also believe that ITU-T should extend its scope to cover more software and business software standardisation that support the operation of the telecommunication business. Finally, many fora participants have experienced getting lost in the process and having no real influence on the result. The working procedures of ITU allow every voice to be heard during the development of a Recommendation, independently of the member being small or large, or being very involved in the subject matter or not. Telektronikk 1.2001
Terje Henriksen (58) is Research Scientist at <strong>Telenor</strong> R&D. He has been involved in standardization and R&D projects within the area of network level modelling since 1991; from 1996 to 2001 as the rapporteur for Question 18 of SG4 within the ITU-T. terje-fredrik.henriksen @telenor.com Telektronikk 1.2001 Network Level Modeling in ITU TERJE HENRIKSEN 1 Introduction In the early nineties, influenced by the emerging object oriented methodology, SG XVIII (later SG 13) in ITU developed the overall network architecture defined in G.805 [1]. It provides a high level view of the network function based on a small set of architectural entities (functional blocks) interconnected via reference points. Two main network representations may be provided on the basis of this architecture: • Topology 1) in terms of links, subnetworks and access groups 2) ; • Connectivity in terms of trails, link connections, subnetwork connections, ports and reference points. The topological view describes the geographical distribution of the resources of a layer network. The access group is a container for a number of co-located access points. The subnetwork represents the routing capabilities within a site or grouping of sites and the link represents the transport capacity between subnetworks. Layering is a method for splitting the overall transport function into a hierarchy of layer networks on top of each other, each of which utilizing the service from the server layer to provide its own service. A topological view of a layer network consisting of three sites is shown in Figure 1. Following the definition of the overall network architecture, the development of the generic (i.e. technology neutral) network model started in 1994 in Question 30 of SG 15. As a consequence Access Group Access Group Link Subnetwork Link Link Link Subnetwork Link Subnetwork of the decision to make SG 4 the “Study Group for Management” within the ITU organisation, network level modeling became Q.18 of SG 4 in 1996. This status paper describes the foundations for the generic model, the functionality currently supported and the extensions planned. To demonstrate the capabilities of the model, the modeling methodology is described in some detail. The creation of a trail termination point is used as a modeling example to illustrate the usage of the different modeling constructs. The existing model is applicable to connectionoriented core network technologies like SDH, ATM and WDM. Work has started to include the access network and also connectionless communication such as IP. 2 Modeling Methodology The modelling methodology [2] was developed by Q.18/4 on the basis of the Reference Model for Open Distributed Processing (RM-ODP) which is specified in [3, 4, 5, 6]. The overview of the resulting methodology given in [7] is the basis for this description. RM-ODP consists of five viewpoints: • The Enterprise Viewpoint; • The Information Viewpoint; • The Computational Viewpoint; • The Engineering Viewpoint; • The Technology Viewpoint (not addressed by the Q.18/4 group). Subnetwork Access Group Layer Network Figure 1 Network Architecture – the topological view 1) of a layer network 2) When modeling the topology of a subnetwork rather than a layer network, one may replace the access group with the connection point group containing a number of co-located connection points. 147
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Telektronikk Volume 97 No. 1 - 2001
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Per Hjalmar Lehne (42) obtained his
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Stein Svaet (41) is Senior Research
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distribution layer possible return
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30 A Co-Ordinated Approach to 4G As
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Radio network subsystem - service c
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