Physical layer frame format for WLAN
First Claim
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.
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Abstract
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.
65 Citations
8 Claims
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1. A method, comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. An apparatus, comprising:
a network interface configured to; receive a data unit, wherein the data unit conforms to a first communication protocol or a second communication protocol; decode a field of a preamble of the data unit, including decoding a received cyclic redundancy check (CRC) included in the field; generate, 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; generate, 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; compare the first generated CRC and the second generated CRC to the received CRC; determine that the data unit conforms to the first communication protocol when the first generated CRC matches the received CRC; and determine that the data unit conforms to the second communication protocol when the second generated CRC matches the received CRC. - View Dependent Claims (6, 7, 8)
Specification