US 9,131,528 B2 · Physical layer frame format for WLAN

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.

Claims8

Dependent claims

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.

5 more elements

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.

6 more elements

Dependencies are inferred from the claim text.

Physical layer frame format for WLAN

Life of this patent

Physical layer frame format for WLAN

Life of this patent

Abstract

Claims8