Physical layer frame format for WLAN
First Claim
1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the PHY data unit conforming to a first communication protocol, the method comprising:
- generating, at a communication device, a first field to be included in a PHY preamble of the PHY data unit, wherein the first field includes a first set of one or more information bits that indicate a duration of the PHY 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 PHY data unit based on the first field;
generating, at the communication device, a second field to be included in the PHY 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 PHY data unit conforms to the first communication protocol, and wherein generating the second field includes generating the second set of one or more information bits according to an error detection scheme not specified by the second communication protocol to signal to receiver devices that conform to the first communication protocol that the PHY data unit conforms to the first communication protocol;
wherein generating the second set of one or more information bits according to the error detection scheme not specified by the second communication protocol includes;
generating a plurality of cyclic redundancy check (CRC) bits for a CRC for the second field, andusing only a subset of the plurality of CRC bits for the CRC for the second field, wherein using only a subset of the CRC bits for the second set of one or more information bits preserves one or more bits of the second set of one or more information bits that would otherwise be used for the CRC of the second field for additional signaling information for a receiver device that conforms to the first communication protocol;
modulating, at the communication device, the first field using a modulation scheme specified for a field corresponding to the first field by the second communication protocol;
convolutionally coding, at the communication device, the second field using a tail biting technique so that the second field omits a tail subfield, wherein using the tail biting technique preserves bits that would otherwise be needed for the tail subfield for additional signaling information for a receiver device that conforms to the first communication protocol;
modulating, at the communication device, the convolutionally coded second field using a modulation scheme specified for a field, which corresponds to the second field, by the second communication protocol;
generating, at the communication device, the PHY preamble to include at least the first field and the second field;
generating, at the communication device, the PHY data unit to include at least the PHY preamble; and
transmitting, from the communication device, the PHY data unit that includes at least the PHY preamble.
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Accused Products
Abstract
A first field of a preamble of a physical layer (PHY) data unit is generated to include a first set of one or more information bits indicating a duration of the data unit and is formatted to conform to a first communication protocol such that the first field allows a receiver device conforming to a second communication protocol to determine the duration of the data unit. A second field of the preamble is generated to include a second set of one or more information bits indicating to a receiver device conforming to the first communication protocol that the data unit conforms to the first communication protocol. The second field is convolutionally coded using a tail biting technique, and 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.
102 Citations
22 Claims
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1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the PHY data unit conforming to a first communication protocol, the method comprising:
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generating, at a communication device, a first field to be included in a PHY preamble of the PHY data unit, wherein the first field includes a first set of one or more information bits that indicate a duration of the PHY 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 PHY data unit based on the first field; generating, at the communication device, a second field to be included in the PHY 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 PHY data unit conforms to the first communication protocol, and wherein generating the second field includes generating the second set of one or more information bits according to an error detection scheme not specified by the second communication protocol to signal to receiver devices that conform to the first communication protocol that the PHY data unit conforms to the first communication protocol; wherein generating the second set of one or more information bits according to the error detection scheme not specified by the second communication protocol includes; generating a plurality of cyclic redundancy check (CRC) bits for a CRC for the second field, and using only a subset of the plurality of CRC bits for the CRC for the second field, wherein using only a subset of the CRC bits for the second set of one or more information bits preserves one or more bits of the second set of one or more information bits that would otherwise be used for the CRC of the second field for additional signaling information for a receiver device that conforms to the first communication protocol; modulating, at the communication device, the first field using a modulation scheme specified for a field corresponding to the first field by the second communication protocol; convolutionally coding, at the communication device, the second field using a tail biting technique so that the second field omits a tail subfield, wherein using the tail biting technique preserves bits that would otherwise be needed for the tail subfield for additional signaling information for a receiver device that conforms to the first communication protocol; modulating, at the communication device, the convolutionally coded second field using a modulation scheme specified for a field, which corresponds to the second field, by the second communication protocol; generating, at the communication device, the PHY preamble to include at least the first field and the second field; generating, at the communication device, the PHY data unit to include at least the PHY preamble; and transmitting, from the communication device, the PHY data unit that includes at least the PHY preamble. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
a network interface device comprising; a physical layer (PHY) processing unit implemented using one or more integrated circuits, the PHY processing unit configured to generate PHY data units for transmission in a wireless communication network, and a medium access control (MAC) processing unit implemented using one or more integrated circuits, the MAC processing unit coupled to the PHY processing unit; wherein the PHY processing unit is configured to; generate a first field to be included in a physical layer (PHY) preamble of a PHY data unit, wherein the first field includes a first set of one or more information bits that indicate a duration of the PHY 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 PHY data unit based on the first field, generate a second field to be included in the PHY 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 PHY data unit conforms to the first communication protocol, and wherein generating the second field includes generating the second set of one or more information bits according to an error detection scheme not specified by the second communication protocol to signal to receiver devices that conform to the first communication protocol that the PHY data unit conforms to the first communication protocol, modulate the first field using a modulation scheme specified for a field corresponding to the first field by the second communication protocol, convolutionally code the second field using a tail biting technique, wherein using the tail biting technique preserves bits that would otherwise be needed for the tail subfield for additional signaling information for a receiver device that conforms to the first communication protocol, modulate the convolutionally coded second field using a modulation scheme specified for a field, which corresponds to the second field, by the second communication protocol, generate the PHY preamble to include at least the first field and the second field, and generate the PHY data unit to include at least the PHY preamble; and transmit the PHY data unit that includes at least the PHY preamble; wherein the PHY processing unit is configured to generate the second set of one or more information bits according to the error detection scheme not specified by the second communication protocol at least by; generating a plurality of cyclic redundancy check (CRC) bits for a CRC for the second field, and using only a subset of the plurality of CRC bits for the CRC for the second field, wherein using only a subset of the CRC bits for the second set of one or more information bits preserves one or more bits of the second set of one or more information bits for additional signaling information for a receiver device that conforms to the first communication protocol. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
Specification