Methods and apparatus for communicating information using...

Details Methods and apparatus for communicating information using... Methods and apparatus for communicating information using...

2011-07-26

2011-07-26

Levitan, Dmitry H (Department: 2461)

Multiplex communications

Communication over free space

Reexamination Certificate

active

07986648

ABSTRACT:
Methods and apparatus implementing communications using different types of symbols, e.g. different characteristic OFDM symbols, at different times for different purposes are described. A first type of symbol is used for control signaling including conveying transmission request signals and/or transmission request response signals. A second type of symbol is used for conveying user data, e.g., traffic signals. The symbol period for a first type symbol is larger than the symbol period for a second type symbol. The tone spacing for a first type symbol is larger than the tone spacing for a second type symbol. The methods and apparatus are well suited for peer to peer communications systems in which a peer to peer communications device operates in a half-duplex mode of operation.

REFERENCES:
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patent: 2004/0081131 (2004-04-01), Walton et al.
patent: 2005/0048979 (2005-03-01), Chun et al.
patent: 2004040803 (2004-05-01), None
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International Search Report—PCT/US07/083389, International Search Authority—European Patent Office, Sep. 1, 2008.
Written Opinion—PCT/US07/083389, International Search Authority—European Patent Office, Sep. 1, 2008.

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