Coexistence of modulation schemes in a WLAN
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United States of America Patent
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Dec 30, 2008
Grant Date -
Jul 10, 2003
app pub date -
Feb 19, 2002
filing date -
Jan 9, 2002
priority date (Note) -
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Abstract
A local area network is provided where an OFDM station and DSSS/CCK station coexist. During a contention-free period both stations operate under the point coordination function rules as defined in the IEEE 802.11 specification. Both stations transmit data when polled by the access point. The contention-free period comprises a sub-contention period during which only the OFDM station communicate. During the sub-contention period the OFDM station operates under the distributed coordination function while the DSSS/CCK station waits to be polled by the access point before starting to communicate.
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