Effective use of GSM for accurate positioning

Cellnet/British Telecom (BT) has been active in the area of GPS/GSM locatio n and application research for over five years. Cellnet/BT have undertaken considerable development: and field trials of various GSM methods for locat ion positioning, which have resulted in several patent registrations. Recen t R&D projects undertaken by the Mobility engineering team at BT Labs. incl ude MOSA (Mobile Social Alarm):and City Guide using GPS positioning data to deliver value-added applications and services for both the general public and business users. A. critical factor to the successful development of inn ovative value-added services is co-operation with partners, to promote and evolve open standards for GSM location.