Multi-mode radio telephone which executes handover between different system
October 16, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesCellular cordless telephone Cellular cordless telephone Protocol and transceiver for cordless/cellular telephone service Mobile station assisted soft handoff in a CDMA cellular communications system Frame synchronization system among multiple radio base stations for TDMA digital mobile communications system Multi-band wireless radiotelephone operative in a plurality of air interface of differing wireless communications systems Method for automatic mode selection for a dual-mode telephone handset for use in a cellular mobile telephone system and in a wireless telephone system Multi-mode radio telephone Bimodal portable telephone Universal wireless radiotelephone system InventorAssigneeApplicationNo. 543479 filed on 10/16/1995US Classes:455/442, Soft handoff455/436HandoffExaminersPrimary: Bost, Dwayne D.Assistant: Johnson, Brian L. Attorney, Agent or FirmForeign Patent References
International ClassH04M 011/00Foreign Application Priority Data1994-12-23 GBAbstractA radio telephone automatically hands over a call from one radio telephone system to another radio telephone system. Communication with respective radio telephone systems may be simultaneously continued during handover until the handover is complete, or communication with one radio telephone system ceases before communication with the other radio telephone system commences. Delays between signals of different radio telephone systems which would cause audible interference are inhibited by FIR filtering and/or dynamic time-warping. If an handover fails then communication with the original radio telephone system is restarted or continued. | |
