I read this paper Charge-then-Forward: Wireless Powered Communication for Multiuser Relay Networks ,and it said it on the second page ,and I don't really understand why is the theory ,the author said, right.

the time of WPT, Wireless Power Transfer, should be as small as possible so that the time for wireless information transmission (WIT) can be maximized for sum-rate maximization

Does anyone know the definition of sum-rate in formula type and the relation of WPT and WIT? I think I can really understand reason if I know these first.


"sum-rate" is just the sum of all rates of communications happening in a network.

The statement is pretty self-evident: The more time your nodes can communicate, the more data they can transfer.

  • $\begingroup$ but it said the time of WPT should be smaller,not longer $\endgroup$ – Shine Sun Jul 14 '18 at 23:05
  • $\begingroup$ Wpt limits wit, which is what you want to maximize $\endgroup$ – Marcus Müller Jul 14 '18 at 23:55
  • $\begingroup$ i think the author should want to maximize WPT $\endgroup$ – Shine Sun Jul 15 '18 at 10:29
  • $\begingroup$ but hasn't the rate been divided by time?if so,why it will become higher when the time become longer? $\endgroup$ – Shine Sun Jul 15 '18 at 10:41
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    $\begingroup$ You have time. You can, in this time, either send power or send data. You want to send data. So you spend as little time as possible sending power, and as much time as possible sending data. (I'm really confused about what's difficult about that concept.) $\endgroup$ – Marcus Müller Jul 15 '18 at 11:05

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