Soft handoff method in a cellular mobile communication system
Patent 6330449 Issued on December 11, 2001. Estimated Expiration Date: 
May 14, 2019. 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.
May 14, 2019. 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 ReferencesHandover following in a mobile radio system Method of optimizing neighbor set during soft handoff of a mobile unit in a CDMA cellular environment Handoff control with a pilot used in a cell of a neighboring cell in a CDMA mobile communication network on a service frequency of the neighboring cell Soft swap handoff method in CDMA cellular system Patent #: 6049716 InventorAssigneeApplicationNo. 311927 filed on 05/14/1999US Classes:455/442, Soft handoff370/331, Hand-off control455/436, Handoff455/439Handoff initiated by another source (e.g., target, user initiated, mobile switching center (MSC), or mobile telephone switching office (MTSO), etc.)ExaminersPrimary: Nguyen, LeeAssistant: Nguyen, Simon Attorney, Agent or FirmInternational ClassH04Q 007/20Foreign Application Priority Data1998-05-29 KRAbstractIt is an object of the present invention to provide a method to prevent soft handoff failures due to a faulty reverse wireless link. In general, when a BSC does not receive a handoff completion message from a mobile station, the BSC commands the mobile station to report the change of the active set a second time. The second report is then compared to a previous report to determine whether there is any change of the active set. In the case there is no change in the active set, the BSC commands the mobile station to perform the handoff. This method is efficient in that the entire soft handoff process need not be repeated in its entirety. | |
