| CPC H04W 74/0816 (2013.01) | 20 Claims |

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1. A network device comprising:
at least one processor; and
a transceiver, wherein the transceiver comprises a plurality of panels,
wherein the at least one processor couple with at least one memory storing computer instructions for execution by the at least one processor that cause the network device to perform operations comprising:
generating a backoff count value of each of the plurality of panels; and
sending a frame in response to that a backoff count value of any one of the plurality of panels backs off to zero.
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