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After transmission return signal

  • US 8,559,365 B2
  • Filed: 10/06/2008
  • Issued: 10/15/2013
  • Est. Priority Date: 10/30/2007
  • Status: Active Grant
First Claim
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1. A network device comprising:

  • a receiver on a target device to receive a transmission from a source device;

    a transmitter at least to transmit a return signal to said source device during at least one return period forming part of an inter-frame period after said transmission, said inter-frame period having an inter-frame gap and each said at least one return period being not longer than said inter-frame gap; and

    a R/NR (received/not received) unit to instruct said transmitter to transmit said return signal during one said return period to indicate a return type for said return signal, wherein said return type is indicated as one of received and non received on said target device by said return period in which said return signal is transmitted.

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