Physical layer frame format for WLAN
First Claim
1. A method for generating a data unit for transmission via a communication channel, the data unit conforming to a first communication protocol, the method comprising:
- generating, at a network interface device, a first field to be included in a preamble of the data unit, wherein the first field includes a first set of one or more information bits that indicate a duration of the data unit, the first field being formatted such that the first field is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine the duration of the data unit based on the first field;
generating, at the network interface device, a second field to be included in the preamble, wherein 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, and wherein generating the second field includes one or both of (i) generating the second set of one or more information bits according to an error detection scheme not specified by the second communication protocol and (ii) generating the second set of one or more information bits to indicate a mode not supported by the second communication protocol;
modulating, at the network interface device, the first field using a modulation scheme specified for a field corresponding to the first field by the second communication protocol;
modulating, at the network interface device, the second field using a modulation scheme specified for a field corresponding to the second field by the second communication protocol;
generating, at the network interface device, the preamble to include at least the first field and the second field; and
generating, at the network interface device, the data unit to include at least the preamble.
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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.
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Citations
24 Claims
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1. A method for generating a data unit for transmission via a communication channel, the data unit conforming to a first communication protocol, the method comprising:
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generating, at a network interface device, a first field to be included in a preamble of the data unit, wherein the first field includes a first set of one or more information bits that indicate a duration of the data unit, the first field being formatted such that the first field is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine the duration of the data unit based on the first field; generating, at the network interface device, a second field to be included in the preamble, wherein 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, and wherein generating the second field includes one or both of (i) generating the second set of one or more information bits according to an error detection scheme not specified by the second communication protocol and (ii) generating the second set of one or more information bits to indicate a mode not supported by the second communication protocol; modulating, at the network interface device, the first field using a modulation scheme specified for a field corresponding to the first field by the second communication protocol; modulating, at the network interface device, the second field using a modulation scheme specified for a field corresponding to the second field by the second communication protocol; generating, at the network interface device, the preamble to include at least the first field and the second field; and generating, at the network interface device, the data unit to include at least the preamble. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
a network interface device having one or more integrated circuits configured to generate a first field to be included in a preamble of the data unit, wherein the first field includes a first set of one or more information bits that indicate a duration of the data unit, the first field being formatted such that the first field is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine the duration of the data unit based on the first field, generate a second field to be included in the preamble, wherein 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, and wherein generating the second field includes one or both of (i) generating the second set of one or more information bits according to an error detection scheme not specified by the second communication protocol and (ii) generating the second set of one or more information bits to indicate a mode not supported by the second communication protocol, modulate the first field using a modulation scheme specified for a field corresponding to the first field by the second communication protocol, modulate the second field using a modulation scheme specified for a field corresponding to the second field by the second communication protocol, generate the preamble to include at least the first field and the second field, and generate the data unit to include at least the preamble. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for generating a data unit for transmission via a communication channel, the data unit conforming to a first communication protocol, the method comprising:
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generating, at the network interface device, a preamble of the data unit, wherein the preamble includes a first field having a plurality of orthogonal frequency division multiplexing (OFDM) symbols, including at least (i) a first OFDM symbol, (i) a second OFDM symbol, and (iii) a third OFDM symbol, wherein the first OFDM symbol is formatted such that the first OFDM symbol is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine that the data unit conforms to a third communication protocol, the second OFDM symbol is formatted such that the first OFDM symbol and the second OFDM symbol are decodable by a receiver device that conforms to a fourth communication protocol, but does not conform to the first communication protocol, to determine that the data unit conforms to the third communication protocol, and the third OFDM symbol is formatted such that a receiver device that conforms to the first communication protocol can determine that the data unit conforms to the first communication protocol; and generating, at the network interface device, the data unit to include at least the preamble. - View Dependent Claims (18, 19, 20)
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21. An apparatus, comprising:
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a network interface device having one or more integrated circuits configured to generate a preamble of the data unit, wherein the preamble includes a first field having a plurality of orthogonal frequency division multiplexing (OFDM) symbols, including at least (i) a first OFDM symbol, (i) a second OFDM symbol, and (iii) a third OFDM symbol, wherein the first OFDM symbol is formatted such that the first OFDM symbol is decodable by a receiver device that conforms to a second communication protocol, but does not conform to the first communication protocol, to determine that the data unit conforms to a third communication protocol, the second OFDM symbol is formatted such that the first OFDM symbol and the second OFDM symbol are decodable by a receiver device that conforms to a fourth communication protocol, but does not conform to the first communication protocol, to determine that the data unit conforms to the third communication protocol, and the third OFDM symbol is formatted such that a receiver device that conforms to the first communication protocol can determine that the data unit conforms to the first communication protocol; and wherein the one or more integrated circuits are further configured to generate the data unit to include at least the preamble. - View Dependent Claims (22, 23, 24)
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Specification