Range extension mode for WiFi
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, by a first communication device, orthogonal frequency division multiplexing (OFDM) symbols for a data field of the PHY data unit according to a range extension coding scheme that corresponds to a range extension mode of the first communication protocol;
generating, by the first communication device, a preamble of the PHY data unit, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme, the first portion of the preamble being formatted such that the first portion of the preamble 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 portion of the preamble;
generating, by the first communication device, the PHY data unit to include the preamble and the data field; and
causing the PHY data unit to be transmitted from the first communication device to a second communication device;
wherein;
generating the preamble comprises generating OFDM symbols for the second portion of the preamble that include i) a non-legacy signal field, and ii) a copy of the non-legacy signal field, wherein the copy of the non-legacy signal field indicates that the at least some OFDM symbols of the data field are generated according to the range extension coding scheme;
generating the preamble further comprises i) generating the first portion of the preamble, and ii) generating the second portion of the preamble; and
generating the first portion of the preamble comprises generating a first legacy signal field for the PHY data unit according to the second communication protocol and generating a second legacy signal field as a copy of the first legacy signal field.
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Abstract
A method for generating a physical layer (PHY) data unit for transmission via a communication channel is described where the PHY data unit conforms to a first communication protocol. Orthogonal frequency division multiplexing (OFDM) symbols for a data field of the PHY data unit are generated according to a range extension coding scheme that corresponds to a range extension mode of the first communication protocol. A preamble of the PHY data unit is generated, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme. The first portion of the preamble is formatted such that the first portion of the preamble 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 portion of the preamble. The PHY data unit is generated to include the preamble and the data field.
117 Citations
38 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, by a first communication device, orthogonal frequency division multiplexing (OFDM) symbols for a data field of the PHY data unit according to a range extension coding scheme that corresponds to a range extension mode of the first communication protocol; generating, by the first communication device, a preamble of the PHY data unit, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme, the first portion of the preamble being formatted such that the first portion of the preamble 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 portion of the preamble; generating, by the first communication device, the PHY data unit to include the preamble and the data field; and causing the PHY data unit to be transmitted from the first communication device to a second communication device; wherein; generating the preamble comprises generating OFDM symbols for the second portion of the preamble that include i) a non-legacy signal field, and ii) a copy of the non-legacy signal field, wherein the copy of the non-legacy signal field indicates that the at least some OFDM symbols of the data field are generated according to the range extension coding scheme; generating the preamble further comprises i) generating the first portion of the preamble, and ii) generating the second portion of the preamble; and generating the first portion of the preamble comprises generating a first legacy signal field for the PHY data unit according to the second communication protocol and generating a second legacy signal field as a copy of the first legacy signal field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A first communication device, comprising:
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a network interface device having one or more integrated circuits configured to; generate orthogonal frequency division multiplexing (OFDM) symbols for a data field of a physical layer (PHY) data unit according to a range extension coding scheme that corresponds to a range extension mode of a first communication protocol to which the PHY data unit conforms, generate a preamble of the PHY data unit, the preamble having i) a first portion that indicates a duration of the PHY data unit and ii) a second portion that indicates whether at least some OFDM symbols of the data field are generated according to the range extension coding scheme, the first portion of the preamble being formatted such that the first portion of the preamble 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 portion of the preamble, generate a first legacy signal field in the first portion of the preamble according to the second communication protocol and generate a second legacy signal field as a copy of the first legacy signal field, generate the PHY data unit to include the preamble and the data field, and cause the PHY data unit to be transmitted from the first communication device to a second communication device; wherein the one or more integrated circuits are configured to generate OFDM symbols for the second portion of the preamble that include i) a non-legacy signal field, and ii) a copy of the non-legacy signal field, wherein the copy of the non-legacy signal field indicates that the at least some OFDM symbols of the data field are generated according to the range extension coding scheme. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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Specification