Call routing method for a radiotelephone in multiple radiotelephone systems

• US 6,363,246 B1
• Filed: 03/07/1995
• Issued: 03/26/2002
• Est. Priority Date: 02/06/1992
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Williams, James M., DʼAvello, Robert F.
• Primary Examiner(s): CUMMING, WILLIAM D
• Application Number:
  US08/400,637
• Time in Patent Office: 2,576 Days
• Field of Search: 379/61, 379/58, 379/59
• US Class Current: 455/403
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal
• CPC Class Codes: H04W 36/0066 of control information between different types of networks in order to establish a new radio link in the target network

Abstract

A portable unit (101) may both place and receive calls in both the cordless (115) and cellular (103) telephone system. A portable unit (101), in combination with a cordless base station (115), can automatically route an incoming call to the telephone system in which the portable unit (101) is located without inconveniencing the user. Additionally, the portable unit (101), in combination with the cordless base station (115), can automatically route a call in process with the portable unit (101) between the cordless (115) and the cellular (103) telephone systems when the portable unit (101) relocates therebetween.

Claims

1. A method of maintaining telephone communications between a telephone device having a telephone number and a cellular cordless telephone on one of a cellular telephone system and a cordless telephone system, the cordless telephone system having a cordless base station coupled to a telephone landline having a landline telephone number, the cellular cordless telephone having a cellular telephone number in the cellular telephone system, the cellular cordless telephone having a transceiver, the method comprising the steps of:

originating and receiving cellular calls, using the transceiver, with the cellular telephone number on cellular radio channels in the cellular telephone system;

originating and receiving cordless calls, using the transceiver, with the landline telephone number on at least one of the cellular radio channels of the cordless base station in the cordless telephone system;

detecting movement of the cellular cordless telephone between the cellular telephone system and the cordless telephone system;

automatically generating a three way call between the telephone device having the telephone number, the cellular cordless telephone having the cellular telephone number and the telephone landline having the landline telephone number responsive to the step of detecting;

automatically terminating a path of the three way call between the telephone device having the telephone number and the cellular cordless telephone having the cellular telephone number when the cellular cordless telephone is located in the cordless telephone system; and

automatically terminating a path of the three way call between the telephone device having the telephone phone number and the telephone landline having the landline telephone number when the cellular cordless telephone is located in the cellular telephone system.