Control mode PHY for WLAN
First Claim
1. A method comprising:
- generating, with a processing device, a first preamble for a first data unit that is to be transmitted via a communication channel, wherein the first preamble includes (i) a first long training field and (ii) a first signal field, wherein the first signal field provides information for interpreting the first data unit, and wherein the first signal field is modulated according to a first modulation technique;
generating, with the processing device, the first data unit according to a first data unit format, wherein the first data unit includes the first preamble;
generating, with the processing device, a second preamble for a second data unit that is to be transmitted via the communication channel, whereinthe second preamble includes a second signal field,the second signal field provides information for interpreting the second data unit,the second preamble includes a second long training field, andgenerating the second preamble includes at least one of(i) repeating information in the second signal field so that a duration of the second signal field is longer than a duration of the first signal field, and(ii) generating the second long training field so that a duration of the second long training field is longer than a duration of the first long training field, andgenerating the second preamble includes one of(i) modulating a portion of the second signal field according to a second modulation technique different than the first modulation technique to signal to a receiver that the second data unit is formatted according to a second data unit format different than the first data unit format, and(ii) modulating a portion of the second long training field according to the second modulation technique to signal to the receiver that the second data unit is formatted according to the second data unit format; and
generating, with the processing device, the second data unit according to the second data unit format, wherein the second data unit includes the second preamble.
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Accused Products
Abstract
A first preamble for a first data unit includes a first long training field and a first signal field modulated according to a first technique. The first data unit is generated according to a first data unit format and includes the first preamble. A second preamble, generated for a second data unit, includes a second signal field and a second long training field. Information in the second signal field is repeated and/or the second long training field is generated so that a duration of the second long training field is longer than a duration of the first long training field. A portion of the second signal field is modulated according to a second technique or a portion of the second long training field is modulated according to the second technique to signal to a receiver that the second data unit is formatted according to a second data unit format.
48 Citations
26 Claims
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1. A method comprising:
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generating, with a processing device, a first preamble for a first data unit that is to be transmitted via a communication channel, wherein the first preamble includes (i) a first long training field and (ii) a first signal field, wherein the first signal field provides information for interpreting the first data unit, and wherein the first signal field is modulated according to a first modulation technique; generating, with the processing device, the first data unit according to a first data unit format, wherein the first data unit includes the first preamble; generating, with the processing device, a second preamble for a second data unit that is to be transmitted via the communication channel, wherein the second preamble includes a second signal field, the second signal field provides information for interpreting the second data unit, the second preamble includes a second long training field, and generating the second preamble includes at least one of (i) repeating information in the second signal field so that a duration of the second signal field is longer than a duration of the first signal field, and (ii) generating the second long training field so that a duration of the second long training field is longer than a duration of the first long training field, and generating the second preamble includes one of (i) modulating a portion of the second signal field according to a second modulation technique different than the first modulation technique to signal to a receiver that the second data unit is formatted according to a second data unit format different than the first data unit format, and (ii) modulating a portion of the second long training field according to the second modulation technique to signal to the receiver that the second data unit is formatted according to the second data unit format; and generating, with the processing device, the second data unit according to the second data unit format, wherein the second data unit includes the second preamble. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a medium access control (MAC) processing unit; and a physical payer (PHY) processing unit, coupled to the MAC processing unit, the PHY processing unit configured to; generate a first preamble for a first data unit, wherein the first preamble includes (i) a first long training field and (ii) a first signal field, wherein the first signal field provides information for interpreting the first data unit, and wherein the first signal field is modulated according to a first modulation technique; generate the first data unit according to a first data unit format, wherein the first data unit includes the first preamble; generate a second preamble for a second data unit, wherein the second preamble includes a second signal field, the second signal field provides information for interpreting the second data unit, the second preamble includes a second long training field; at least one of (i) repeat information in the second signal field so that a duration of the second signal field is longer than a duration of the first signal field, and (ii) generate the second long training field so that a duration of the second long training field is longer than a duration of the first long training field; and one of (i) modulate a portion of the second signal field according to a second modulation technique different than the first modulation technique to signal to a receiver that the second data unit is formatted according to a second data unit format different than the first data unit format, and (ii) modulate a portion of the second long training field according to the second modulation technique to signal to the receiver that the second data unit is formatted according to the second data unit format; and generate the second data unit according to the second data unit format, wherein the second data unit includes the second preamble. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification