Minimizing the Adverse Effects of Asymmetric Links: A Novel Cooperative Asynchronous MAC Protocol for Wireless Sensor Networks

. 2019 May 26;19(10):2402. doi: 10.3390/s19102402

Algorithm 4 Link symmetric.

1:
if a beacon packet received from $P_{u}$ then ▹ Child u sending data to Parent $P_{u}$
2:
Child takes a random backoff and checks the $C C A$
3:
if win the channel then
4:
send data to $P_{u}$ and go to sleep mode
5:
else
6:
wait for next beacon
7:
end if
8:
end if
9:
if a data packet received from $P_{u}$ then ▹ receiver $P_{u}$ received data from child u
10:
send ACK to sender
11:
end if