Patent ID: 6014563
Filing Date: 2000-01-11
Classification: H04L,H04W

Abstract:
A radio system (PRS) for subscribers forming a closed user group, comprisingradiotelephones (MS) which transmit respective subscriber identifications (IMSI) for establishing radio calls,at least one base station (BTS1, BTS2), and a device (MONE) including means for connecting (IF1, IF2) the at least one base station (BTS1, BTS2) to a public switched telecommunication network (PSTN), a subscriber data management means (MM) and a subscriber data base (ID) to check by means of said subscriber data management means (MM) whether a given transmitted subscriber identification (IMSI) authorizes a subscriber access to the radio system, and base station control means (RR) which assigns an authorized subscriber with radiotelephone (MS), at least for the duration of a radio call, to one base station of the at least one base station (BTS1), wherein the radiotelephones (MS) include card-reading devices for reading authorization cards, on each of which a subscriber identification (IMSI) for the radio system (PRS) for subscribers forming said closed user group and another subscriber identification for a public mobile-radio system are stored on opposite sides thereof, wherein said cards have contact areas on both of said opposite sides and, depending on which side is facing toward contacts of the card-reading devices,said card-reading devices read said respective subscriber identifications from said cards inserted by said subscribers for the radio system for subscribers forming said closed user group or for said public mobile-radio system, wherein said subscriber database is checked against said given transmitted subscriber identification with said subscriber data management means (MM) and wherein said authorized subscriber is granted access to said closed user group or to said public mobile-radio system.