sensys-ch5-mac
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PAMAS – Already ongoing transmission<br />
• Suppose a node C in vicinity of A is already receiving a<br />
packet when A initiates RTS<br />
• Procedure<br />
• A sends RTS to B<br />
• C is sending busy tone (as it receives data)<br />
C<br />
A<br />
• CTS and busy tone collide, A receives no CTS, does not send data<br />
?<br />
B<br />
Control<br />
channel<br />
Data<br />
channel<br />
Busy tone by C<br />
RTS<br />
A ! B<br />
CTS<br />
B ! A<br />
No data!<br />
Time<br />
Similarly: Ongoing<br />
transmission near B<br />
destroys RTS by<br />
busy tone<br />
SS 05 Ad hoc & sensor networs - Ch 5: MAC protocols 22
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