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Doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 1 Proposed Change to CCK-OFDM Signal Extension Mark Webster Steve Halford.

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Presentation on theme: "Doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 1 Proposed Change to CCK-OFDM Signal Extension Mark Webster Steve Halford."— Presentation transcript:

1 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 1 Proposed Change to CCK-OFDM Signal Extension Mark Webster Steve Halford Intersil Corporation

2 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 2 Signal Extension For CCK-OFDM A 6 usec signal extension is added to CCK- OFDM to provide 802.11b SIFS compatibility Current 802.11g draft 1.1 specifies the signal extension as active on-the-air energy This presentation recommends specifying a paasive signal extension.

3 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 3 Signal Extension in 802.11g Draft 1.1

4 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 4 Proposed Change to Signal Extension Extend With No Signal

5 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 5 CCK-OFDM TXTIME Calculation TXTIME = PreambleLengthCCK + PLCPHeaderTimeCCK + PreambleLengthOFDM + PLCPSignalOFDM + 4 x Ceiling((PLCPServiceBits + 8 x (number-of-octets) + PadBits) / N DBPS ) + SignalExtension SignalExtension = 6 usecs Remains Unchanged

6 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 6 Disadvantages of Recommended Change None. –Current 802.11b implementations do not use a pure ED CCA mechanism. –An active signal extension only helps BSS where an ED mechanism is used. –The header length/field is necessary and sufficient

7 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 7 Advantages of Recommended Change The length field in the 802.11b header is necessary and sufficient to provide virtual CCA Matches the signal structure of the ER/OFDM. Maximizes reuse of existing 802.11a designs Enables faster Rx-to-Tx and Tx-to-Rx switching Saves battery power. BSS with only 802.11g stations, behave more like 802.11a

8 doc.: IEEE 802.11-02/102r0 Submission January 2002 M. Webster, et al IntersilSlide 8 Conclusion Make a motion: –Move to have the editor revise the 802.11g draft to specify that CCK-OFDM use a passive 6 usec signal extension.

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