Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2001-12-31
2008-05-20
Trost, William (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C370S331000
Reexamination Certificate
active
07376424
ABSTRACT:
A method for seamless inter-frequency hard handover in a radio communication system is disclosed. The method for seamless inter-frequency hard handover includes the steps of: a) at a mobile station, blocking a first uplink carrier frequency used for communication, transmitting a direct sequence spread preamable signal through a second uplink carrier frequency for a short time, and continuously performing the communication through the first uplink carrier frequency: and h) at a target base transciever station, acquiring an uplink synchronization of a mobile station based on the preamble before performing handover.
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Bang Seung-Chan
Kim Chang-Joo
Kim Il-Gyu
Kim Jae-Heung
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Santiago-Cordero Marivelisse
Trost William
LandOfFree
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