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This section reports about the early discussions in the 1882–1985 timeframe, the agreement on a service concept in February 1985 and the elaboration of the first set of specifications needed for tendering of infrastructure by the operators in early 1988. A well structured and future-proof portfolio of tele-, bearer and supplementary services was specified. | GSM and UMTS The Creation of Global Mobile Communication Edited by Friedhelm Hillebrand Copyright 2001 John Wiley Sons Ltd ISBNs 0-470-84322-5 Hardback 0-470-845546 Electronic Chapter 10 Services and Services Capabilities Section 1 The Early Years up to the Completion of the First Set of Specifications for Tendering of Infrastructure 1982 to March 1988 Friedhelm Hillebrand1 10.1.1 Introduction This section reports about the early discussions in the 1882-1985 timeframe the agreement on a service concept in February 1985 and the elaboration of the first set of specifications needed for tendering of infrastructure by the operators in early 1988. A well structured and future-proof portfolio of tele- bearer and supplementary services was specified. The principles for charging and accounting of international roamers were agreed. Innovative solutions for mobile station licensing circulation and type approval recommendations were developed. They needed to be implemented by national or international regulatory authorities. This intensive services work provided guidance to the technical work on radio network and data aspects. During this period the culture of service-lead standardisation was developed in GSM. This was a major achievement in the GSM work since it ensured market orientation. 10.1.2 Overall Guidance is Provided by the CEPT Mandate and the First GSM Action Plan of December 1982 The mandate of CEPT for the GSM work requests the Harmonisation of the technical and operational characteristics of a public mobile communication system in the 900 MHz band .2 The first action plan prepared by the Nordic and Dutch PTTs was approved at GSM 1 in December 1982.3 It contained basic requirements. Those related to services were 1 GSM Working Party 1 Services Aspects WP1 was chaired by Martine Alvernhe France Telecom from February 1985 to April 1991 with great engagement. I was an active contributor and participant in the work of WP1 during the period treated in this section. .