doc.: IEEE /0716r6 Submission May 2015 Shiwen He, Haiming Wang Slide 9 Explanation of each field in SIG  Continued BitFieldsNumber of BitsDescription B41-B42Spreading Factor/Aggregation/ Additional PPDU 2For CPHY: Set to 0: spreading by 13 Set to 1: spreading by 7 Set to 2: spreading by 4 Set to 3: no spreading For SC/OFDM PHY: Aggregation: Set to 1 indicate that the PPDU in the data portion of the packet contains an A-MPDU; otherwise, set to 0.
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