Apparatus and method for use in identifying presence of wireless terminals in mobile wireless communications systems
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United States of America Patent
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-
Mar 10, 2009
Grant Date -
Dec 8, 2005
app pub date -
Aug 8, 2005
filing date -
Jan 8, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An unique arrangement including a so-called timing control order and timing control signals is employed to identify whether wireless terminals are reachable within a base station cell coverage area in a wireless communications system. To this end, detection of a particular wireless terminal being alive and well, and within the cell coverage area associated with a base station is effected by the base station transmitting a timing control order in a timing control time slot reserved for the particular wireless terminal. If the particular wireless terminal receives the timing control order, it transmits a prescribed timing control message at a prescribed time. If the base station does not receive the timing control message, it is an indication that communication with the particular wireless terminal has been lost.
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