From: Cooperative wireless energy harvesting and information transfer in stochastic networks
 | Non-cooperative | Cooperative |
---|---|---|
 | link | link |
Which relay | No relay | Relay at a |
is selected? | selection | particular location |
Time fraction | Ï„ | Ï„ |
for the WET | Â | Â |
Wireless energy | Destination →source | Destination and |
transfer |  | relay →source |
Data transmission | \(\frac {1-\tau }{2}\) | \(\frac {1-\tau }{2}\) |
duration | Â | Â |
Data transmission | Source →destination | Source →destination |
Data retransmission | \(\frac {1-\tau }{2}\) | \(\frac {1-\tau }{2}\) |
duration | Â | Â |
Data retransmission | Source →destination | Source or |
 |  | relay →destination |