Radio telephone call handover
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 6, 2000
Grant Date -
N/A
app pub date -
Jul 17, 1997
filing date -
Nov 1, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Radio telephone apparatus for use in an underground railway system comprises two base stations 3, 4 respectively located at successive railway stations 1, 2. The base station 3 feeds a radiating cable 7 extending in the tunnel bore towards the base station 4 which feeds a radiating cable 12 extending in the tunnel bore towards the base station 3. When a train travels from the station 1 to the station 2, the mobile radio on the train effects call handover, ie transference of communication with cable 7 to communication with cable 12. To ensure no interruption in a call during handover, an attenuator 16 is incorporated in the cable 7 adjacent its end, such that the mobile radio effects call handover to the cable 12 before losing communication with the cable 7, even at the maximum possible speed of the train.
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Family
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