(5) The Development of the GSM Phase 1 Specifications for Service

Opening from 1989 to 1990

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During the work it turned out that it was not possible to specify every feature which was mentioned in the Action Plan. A selection was made for the service opening in 1991. This set of Specifications was called GSM Phase 1. It contained the new radio subsystem, the new core network including the security architecture including the SIM. But it supported only a limited set of services as telephony including international roaming as well as some supplementary services (call barring and call forwarding). These specifications were functionally frozen in GSM#25bis in January 1990. This meant that no new features could be added and only errors could be corrected or gaps could be filled after this date. This set of specifications contained 5000 pages and was published in 1990 (GSM 160/91).

In parallel the specifications needed for type approval of mobile stations were developed. The GSM MoU Group specified and procured a system simulator to be used as tool for type approval.

In Q2 1989 TC GSM was transferred to the newly created ETSI. The working methods remained largely unchanged. However manufacturers could now take part directly as ETSI Members. This resulted in more participants and contributors to the work.

At request of the UK specifications for Personal Communication Networks working in 1800 MHz needed to be developed. Since the deadline was short, GSM chose to modify the GSM900 specifications where necessary for this application. Hence PCN became in fact GSM1800 and was later renamed accordingly.

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