Orthogonal frequency division multiple access protection
First Claim
1. A method for simultaneous communication in a wireless local area network, the method comprising:
- allocating, by a first communication device, respective frequency allocations for a plurality of other communication devices, including a second communication device and a third communication device, for one or more subsequent transmissions to or by the plurality of other communication devices, the respective frequency allocations including i) a first frequency allocation corresponding to the second communication device, the first frequency allocation corresponding to a first frequency portion of a first sub-channel among a plurality of sub-channels of an orthogonal frequency division multiplexing (OFDM) channel, and ii) a second frequency allocation corresponding to the third communication device, the second frequency allocation corresponding to a second frequency portion of the first sub-channel, the second frequency portion different than the first frequency portion;
transmitting, by the first communication device, a request-to-send (RTS) frame to the plurality of other communication devices, wherein the RTS frame;
i) is duplicated by the first communication device across each of the plurality of sub-channels, ii) indicates that the plurality of other communication devices are requested to simultaneously transmit respective clear-to-send (CTS) frames to the first communication device;
receiving, at the first communication device, at least some of the respective CTS frames from at least some of the plurality of other communication devices, wherein the respective CTS frames include at least;
a first CTS frame from the second communication device, the first CTS frame spanning the first sub-channel that encompasses the first frequency portion and the second frequency portion, anda second CTS frame from the third communication device, the second CTS frame spanning the first sub-channel that encompasses the first frequency portion and the second frequency portion, wherein the second CTS frame is received simultaneously with reception of the first CTS frame, and wherein the at least some of the respective CTS frames indicate that at least some of the plurality of sub-channels are available; and
transmitting, by the first communication device, an orthogonal frequency division multiple access (OFDMA) data unit in response to the at least some of the respective CTS frames, the OFDMA data unit including first data for the second communication device in the first frequency portion and second data for the third communication device in the second frequency portion.
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Accused Products
Abstract
A method for simultaneous communication in a wireless local area network is described. A first control frame is transmitted by a first communication device to a plurality of communication devices, is duplicated across each of a plurality of sub-channels of an orthogonal frequency division multiplexing channel, and indicates that the communication devices are requested to simultaneously transmit respective control frames to the first communication device. Respective control frames are received, including second and third control frames from second and third communication devices, respectively, that are transmitted via a same sub-channel having a smallest bandwidth of the wireless local area network and indicate that at least some of the plurality of sub-channels are available. One of an orthogonal frequency division multiple access data unit and a duplicated legacy data unit is transmitted by the first communication device in response to the control frames via the available sub-channels.
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Citations
24 Claims
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1. A method for simultaneous communication in a wireless local area network, the method comprising:
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allocating, by a first communication device, respective frequency allocations for a plurality of other communication devices, including a second communication device and a third communication device, for one or more subsequent transmissions to or by the plurality of other communication devices, the respective frequency allocations including i) a first frequency allocation corresponding to the second communication device, the first frequency allocation corresponding to a first frequency portion of a first sub-channel among a plurality of sub-channels of an orthogonal frequency division multiplexing (OFDM) channel, and ii) a second frequency allocation corresponding to the third communication device, the second frequency allocation corresponding to a second frequency portion of the first sub-channel, the second frequency portion different than the first frequency portion; transmitting, by the first communication device, a request-to-send (RTS) frame to the plurality of other communication devices, wherein the RTS frame;
i) is duplicated by the first communication device across each of the plurality of sub-channels, ii) indicates that the plurality of other communication devices are requested to simultaneously transmit respective clear-to-send (CTS) frames to the first communication device;receiving, at the first communication device, at least some of the respective CTS frames from at least some of the plurality of other communication devices, wherein the respective CTS frames include at least; a first CTS frame from the second communication device, the first CTS frame spanning the first sub-channel that encompasses the first frequency portion and the second frequency portion, and a second CTS frame from the third communication device, the second CTS frame spanning the first sub-channel that encompasses the first frequency portion and the second frequency portion, wherein the second CTS frame is received simultaneously with reception of the first CTS frame, and wherein the at least some of the respective CTS frames indicate that at least some of the plurality of sub-channels are available; and transmitting, by the first communication device, an orthogonal frequency division multiple access (OFDMA) data unit in response to the at least some of the respective CTS frames, the OFDMA data unit including first data for the second communication device in the first frequency portion and second data for the third communication device in the second frequency portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A first communication device for simultaneous communication in a wireless local area network, the first communication device comprising:
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a network interface device having one or more integrated circuits configured to; allocate respective frequency allocations for a plurality of other communication devices, including a second communication device and a third communication device, for one or more subsequent transmissions to or by the plurality of other communication devices, the respective frequency allocations including i) a first frequency allocation corresponding to the second communication device, the first frequency allocation corresponding to a first frequency portion of a first sub-channel among a plurality of sub-channels of an orthogonal frequency division multiplexing (OFDM) channel, and ii) a second frequency allocation corresponding to the third communication device, the second frequency allocation corresponding to a second frequency portion of the first sub-channel, the second frequency portion different than the first frequency portion, transmit a request-to-send (RTS) frame to the plurality of other communication devices, wherein the RTS frame;
i) is duplicated by the first communication device across each of the plurality of sub-channels, ii) indicates that the plurality of other communication devices are requested to simultaneously transmit respective clear-to-send (CTS) frames to the first communication device,receive at least some of the respective CTS frames from at least some of the plurality of other communication devices, wherein the respective CTS frames include at least; a first CTS frame from the second communication device, the first CTS frame spanning the first sub-channel that encompasses the first frequency portion and the second frequency portion, and a second CTS frame from the third communication device, the second CTS frame spanning the first sub-channel that encompasses the first frequency portion and the second frequency portion, wherein the second CTS frame is received simultaneously with reception of the first CTS frame, and wherein the at least some of the respective CTS frames indicate that at least some of the plurality of sub-channels are available; wherein the one or more integrated circuits are further configured to; generate a transmission signal corresponding to an orthogonal frequency division multiple access (OFDMA) data unit in response to the at least some of the respective CTS frames, the OFDMA data unit including first data for the second communication device in the first frequency portion and second data for the third communication device in the second frequency portion. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for simultaneous communication in a wireless local area network, the method comprising:
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receiving, by a first communication device and from a second communication device, a request to send (RTS) frame, wherein the RTS frame;
i) is duplicated across each of a plurality of sub-channels of an orthogonal frequency division multiplexing (OFDM) channel, and ii) indicates a request for the first communication device to transmit a first clear to send (CTS) frame to the second communication device;determining, by the first communication device, whether at least a sub-channel, of the plurality of sub-channels, is available, wherein a first frequency portion of the sub-channel is allocated to the first communication device; in response to determining that the sub-channel of the plurality of sub-channels is available, providing the first CTS frame to the second communication device, the first CTS frame spanning the sub-channel; wherein providing the first CTS frame comprises; generating the first CTS frame to indicate that the at least some of the plurality of sub-channels are available, identifying a scramble seed for the first CTS frame that allows the second communication device to decode i) the first CTS frame, and ii) a second CTS frame to be transmitted by a third communication device that is allocated a second frequency portion of the sub-channel, the second frequency portion being different than the first frequency portion, the second CTS frame spanning the sub-channel that encompasses the first frequency portion and the second frequency portion, wherein the first CTS frame is to be transmitted simultaneously with the second CTS frame, and scrambling the first CTS frame with the identified scramble seed. - View Dependent Claims (20, 21)
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22. A first communication device for simultaneous communication in a wireless local area network, the first communication device comprising:
a network interface device having one or more integrated circuits configured to; receive, from a second communication device, a request to send (RTS) frame, wherein the RTS frame;
i) is duplicated across each of a plurality of sub-channels of an orthogonal frequency division multiplexing (OFDM) channel, and ii) indicates a request for the first communication device to transmit a first clear to send (CTS) frame to the second communication device,determine whether at least a sub-channel, of the plurality of sub-channels, is available, wherein a first frequency portion of the sub-channel is allocated to the first communication device, in response to determining that the sub-channel of the plurality of sub-channels is available, providing the first CTS frame to the second communication device, the first CTS frame spanning the sub-channel, generate the first CTS frame to indicate that the at least some of the plurality of sub-channels are available, identify a scramble seed for the first CTS frame that allows the second communication device to decode i) the first CTS frame, and ii) a second CTS frame to be transmitted by a third communication device that is allocated a second frequency portion of the sub-channel, the second frequency portion being different than the first frequency portion, the second CTS frame spanning the sub-channel encompassing the first frequency portion and the second frequency portion, wherein the first CTS frame is to be transmitted simultaneously with the second CTS frame, and scramble the first CTS frame with the identified scramble seed. - View Dependent Claims (23, 24)
Specification