Patent ID: 6085087
Filing Date: 2000-07-04
Classification: H04W

Abstract:
A roaming control method for a digital mobile telephone in a call reception control scheme at a home network and a roaming network, comprising the steps of:a) loading a set of perch channels of the home network and scanning the loaded perch channels to select ones of the perch channels having respective levels of reception radio wave larger than a predetermined level;b) activating one of the selected perch channels to receive broadcast information of the activated perch channel;c) deciding whether a network number included in the received broadcast information coincides with a home network number preloaded in the digital mobile telephone;d) if not coincident in the step c), deciding whether the network number included in the received broadcast information coincides with a roaming network number preloaded in the digital mobile telephone;e) if coincident in the step c) or d), receiving a call via the perch channel decided as being coincident;f) if not coincident in the step d), activating another of the selected perch channels to receive broadcast information and re-entering the step c); andg) if it is decided for the selected perch channels that a network number included in any broadcast information does not coincide the home network number or roaming network number, newly loading a set of perch channels of the roaming network and shifting to a mode for successfully searching the perch channels of the roaming network to receive a call.