(19)

(11)

EP 0 321 540 A1

(12)

(43) Date of publication: 28.06.1989 Bulletin 1989/26 (21) Application number: 88906145.0 (22) Date of filing: 18.05.1988

(51) International Patent Classification (IPC):  H04B 1/ 58( . ) H04M 3/ 00( . ) (86) International application number: PCT/SE1988/000254 (87) International publication number: WO 1988/010539 (29.12.1988 Gazette 1988/28)

(84) Designated Contracting States: BE CH DE FR GB IT LI NL (30) Priority: 15.06.1987 SE 19870002486 (71) Applicant: TELEFONAKTIEBOLAGET L M ERICSSON S-126 25 Stockholm (SE)	(72) Inventors: JOHANNESSON, Nils-Olof S-125 31 Älvsjö (SE) ERIKSSON, Anders, Gunnar S-141 46 Huddinge (SE)