Physical layer frame format for WLAN

摘要

In a method for generating a data unit conforming to a first communication protocol, a first field and a second field to be included in a preamble of the data unit are generated. The first field includes a first set of one or more information bits that indicate a duration of the data unit and is formatted such that the first field allows a receiver device that conforms to a second communication protocol to determine the duration of the data unit. The second field includes a second set of one or more information bits that indicate to a receiver device that conforms to the first communication protocol that the data unit conforms to the first communication protocol. The first field and the second field are modulated using a modulation scheme specified for a field corresponding to the first field and the second field, respectively, by the second communication protocol.

主权项

1. A method, comprising:
receiving a data unit, wherein the data unit conforms to a first communication protocol or to a second communication protocol; decoding a field of a preamble of the data unit, including decoding a received cyclic redundancy check (CRC) included in the field; generating, based on the field, a first CRC using a first CRC generation scheme, the first CRC generation scheme specified for the first field by the first communication protocol; generating, based on the field, a second CRC using a second CRC generation scheme, the second CRC generation scheme specified for the field by the second communication protocol; comparing (i) the first generated CRC and (ii) the second generated CRC to the received CRC; determining that the data unit conforms to the first communication protocol when the first generated CRC matches the received CRC; and determining that the data unit conforms to the second communication protocol when the second generated CRC matches the received CRC.