Unformatted text preview: slotted ALOHA. In this problem, we complete the derivation. a) Recall that when there are N active nodes the efficiency of slotted ALOHA is Np (1 − p ) N − 1 . Find the value of p that maximizes this expression. b) Using the value of p found in (a), find the efficiency of slotted ALOHA by letting N approach infinity. Hint: (1 − 1/ N ) N approaches 1/ e as N approaches infinity. c) Compare your result in part (b) with the efficiency of pure ALOHA. Which protocol has a higher efficiency? Why? 4. Consider a slotted ALOHA system with two terminals, A and B. Terminal A transmits at the beginning of a time slot with probability 0.6, whereas terminal B transmits with probability 0.3. a) What is the throughput of terminal A? b) What is the throughput of terminal B?...
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- Spring '11
- media access control, Measuring network throughput, ALOHA, ALOHAnet