Patent ID: 6459688
Filing Date: 2002-10-01
Classification: H04W

Abstract:
A registration method used for registering at least one dual mode mobile station (MMS) with an associated private base station (DBS), said private base station (DBS) being connected to a public telephone network (PSTN, ISDN) and using, for transmission and reception, frequencies which are close to or identical to those used in a cellular radio system, said dual mode mobile station (MMS) being able to operate either in â€œcordlessâ€  mode, or in â€œcellularâ€  mode,said method comprising: interchanging signals in accordance with a preset protocol based on a preset frequency hopping law, for determining a frequency over which each signal is to be transmitted, and on a preset uplink start-up frequency (f1,M), over which the dual mode mobile station transmits a first signal, said frequency hopping law and said uplink start-up frequency being specific to, and known by, the dual mode mobile station and associated private base station, said method further comprising an initial contact stage (20) itself including the following steps: transmitting, at the dual mode mobile station, a contact burst (50), made up of a pure sine wave at said uplink start-up frequency (f1,M); receiving, at the private base station which is in receive mode, the contact burst (50), and answering by transmitting an acknowledgment burst (51), made up of a pure sine wave at a downlink start-up frequency (f1,D) associated with said uplink start-up frequency (f1,M); and receiving, at the dual mode mobile station, the acknowledgment burst (51).