Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-05-24
1998-10-13
Safourek, Benedict V.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370333, 370337, 370347, 455442, H04J 316
Patent
active
058223134
ABSTRACT:
A technique is disclosed for allowing a seamless handover between base stations in a TDMA controller as a telephone handset is transported from one base station's area to another. The disclosed circuitry enables the TDMA controller to assess the quality of the handover before switching to the new base station. When it is determined that a handover operation is to commence, transmissions are made in the original slot time and a handover slot time within the same frame. Also during the same frame, data is received at two separate slot times. Only when it is determined that the data received in the handover slot time contains no transmission errors is the handover completed by then only transmitting on the handover slot transmit time and receiving on the handover slot receive time. In the preferred embodiment, it is determined whether the received data contains no transmission errors by detecting the CRC codes, the signal strength, and the existence of any invalid words.
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Malek Charles J.
Rose Dennis M.
Socci Gerard G.
Weigand David L.
National Semiconductor Corporation
Ogonowsky Brian D.
Rao Seema S.
Safourek Benedict V.
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