Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-11-21
2006-11-21
Urban, Edward F. (Department: 2684)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456500, C455S517000, C455S414200
Reexamination Certificate
active
07139580
ABSTRACT:
Techniques to determine the position of a terminal under the coverage of a repeater in a wireless communication system. In an aspect, an identification code is transmitted for each repeater and used by the terminal (or a PDE) to unambiguously identify the repeater. The identification codes for the repeaters in the system can be implemented with PN sequences at defined offsets that are specifically reserved for repeater identification. In another aspect, the identification code for each repeater is transmitted using a spread-spectrum signal designed to have minimal impact on the performance of the system and to be recoverable by the terminal in similar manner as for a forward modulated signal. In this way, no additional hardware is required for the terminal to recover the identifier signal. In one specific design, the spread spectrum identifier signal is generated in accordance with and conforms to the IS-95 CDMA standard.
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Stein Jeremy M.
Weissman Haim
Greenhaus Bruce W.
Lee John J.
Mays Andrea L.
Qualcomm Incorporated
Urban Edward F.
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