(19)

(11)

EP 0 501 972 A1

(12)

(43) Date of publication: 09.09.1992 Bulletin 1992/37 (21) Application number: 90915615.0 (22) Date of filing: 15.10.1990

(51) International Patent Classification (IPC):  H04B 7/ 15( . ) H04B 7/ 204( . ) H04B 7/ 185( . ) H04W 84/ 02( . ) (86) International application number: PCT/US1990/005845 (87) International publication number: WO 1991/007023 (16.05.1991 Gazette 1991/11)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 06.11.1989 US 19890431806 (71) Applicant: MOTOROLA, INC. Schaumburg, IL 60196 (US)	(72) Inventor: DAVIS, Walter, Lee Coral Springs, FL 33071 (US) (74) Representative: Dunlop, Hugh Christopher, et al  Motorola, European Intellectual Property, Midpoint, Alencon Link Basingstoke, Hampshire RG21 7PL Basingstoke, Hampshire RG21 7PL (GB)