Apparatus and method for use in identifying presence of...

Details Apparatus and method for use in identifying presence of... Apparatus and method for use in identifying presence of...

2005-08-23

2005-08-23

Gelin, Jean (Department: 2681)

Telecommunications

Radiotelephone system

Out-of-range indication

C455S552100, C455S426100, C455S345000, C455S517000, C455S404100, C455S458000, C455S009000, C455S013400, C370S311000, C370S333000, C370S336000, C370S330000

Reexamination Certificate

active

06934539

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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patent: 6453172 (2002-09-01), Miyashita
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patent: 2 344 202 (2000-05-01), None
patent: WO 94/10810 (1994-05-01), None
European Search Report, Apr. 29, 2002, 4 pages.

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