What is a key feature of random access protocols? Question 27 options: Collision avoidance Nodes transmit at a fraction of the channel rate Frequency division Nodes transmit at the full rate of the channel Time slot assignments
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Random access protocols are methods used in networking where multiple nodes can attempt to transmit data over a shared communication channel without prior coordination. Show more…
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Let A and B be two nodes in a wireless network with access point X. Assume that A and B cannot hear each other's transmissions, but can hear X. At time 0, X is sending a packet to some other node and it completes sending this packet at time 100 µs. At time 30, a packet becomes available for transmission at A and at time 70, a packet becomes available for transmission at B. Assume that A needs 200 µs to send its packet and B needs 100 µs to send its packet. Let tA be the initial value of the backoff timer for A and let tB be the initial value of the backoff timer for B. Can A and B transmit their packets without colliding if |tA - tB| = 130? Explain. A is assigned a backoff timer of 100 and B is assigned a backoff timer of 50. For each of the access point and hosts, what time do they start sending their packets? You may ignore the inter-frame spacing and the time required for acks. Of the packets sent, which are successfully delivered on the first attempt? For each packet that is not successfully delivered on the first attempt, approximately when does the sending host learn that the packet was lost and must be sent again? Now, suppose RTS/CTS is enabled. In this case, approximately when does each host send its data packet? You may assume that the time needed to send RTS, CTS, and ACK packets is negligible.
Sri K.
'It is best to use channel allocation algorithms when channel traffic is continuous and the number of stations is small and fixed. Multiple Static Collision Dynamic'
Chandra J.
Akash M.
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