Mobile Ad Hoc Networking for the Transformed Army (MANTA) - Mitre
Mobile Ad Hoc Networking for the Transformed Army (MANTA) - Mitre
Mobile Ad Hoc Networking for the Transformed Army (MANTA) - Mitre
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Our channel access techniques ensure fairness<br />
and support QoS while avoiding <strong>the</strong> classic<br />
“hidden terminal” and “exposed terminal”<br />
problems.<br />
3<br />
2<br />
1<br />
A<br />
3 1<br />
2<br />
B<br />
1<br />
3<br />
2<br />
C<br />
A and C are hidden from each<br />
o<strong>the</strong>r – <strong>the</strong>y cannot directly<br />
“sense” each o<strong>the</strong>r. Our<br />
signaling protocol eliminates<br />
collisions by providing<br />
“indirect sensing” via echoes.<br />
A<br />
A<br />
B<br />
Exposed Terminal ( ET ( ET)<br />
)<br />
packet packet packet packet<br />
packet packet packet packet<br />
time<br />
Time synchronized transmissions (à la SCR and<br />
SUMA) avoid <strong>the</strong> exposed terminal problem seen in<br />
asynchronous protocols such as 802.11b.<br />
B<br />
© 2004, The MITRE Corporation
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