Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
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IEEE 802.11: multiple access<br />
avoid collisions: 2 + nodes transmitting at same time<br />
802.11: CSMA - sense before transmitting<br />
don’t collide with ongoing transmission by other node<br />
802.11: no collision detection!<br />
difficult to receive (sense collisions) when transmitting due<br />
to weak received signals (fading)<br />
can’t sense all collisions in any case: hidden terminal, fading<br />
goal: avoid collisions: CSMA/C(ollision)A(voidance)<br />
C<br />
A B C<br />
A<br />
B<br />
A’s signal<br />
strength<br />
C’s signal<br />
strength<br />
space<br />
6: <strong>Wireless</strong> <strong>and</strong> <strong>Mobile</strong> <strong><strong>Network</strong>s</strong> 6-22
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