Problem 1: 2 Protocol Description 1. Node A sends a Frame to Node B. Node A waits for the acknowledgement from Node B before sending the next Frame. 2. The time axis is partitioned into slots corresponding to packet length. When a Node has a Frame to transmit, it transmits only at the beginning of a time slot. 3. Stations take turn accessing the medium. "right-totransmit" is managed by a central controller. 4. Node A sends five frames without waiting for ACK. After that, Node A sends a new frame upon the receipt of ACK, or goes back five frames and retransmits them again. 5. Node A has a Frame to send. It immediately sends the Frame through the shared medium. 6. Different Periodic time slots are allocated to different users 7. Node A sends five Frames in a sequence successfully. The acknowledgement for Frame 3 is lost. After the time -out, Node A retransmits Frame 3 only. 8. Node A has a Frame to send. It senses the channel before transmission. The channel is idle, node A waits a random backoff period and then sense the carrier again. The channel is idle, it transmits immediately. 9. Different Frequency bands are allocated to different users 10. Node A has a Frame to send. It senses the channel before transmission. If idle, it waits for a specific time. If still idle it transmits a request-to-send (RTS) control packet. 11. Different Pseudo-random spreading codes are allocated to different users 12. Node A has a Frame to send. It senses the channel before transmission. It starts transmission as soon as the channel becomes idle. If a collision is detected during transmission. transmission is aborted. 13. When the node has something to transmit it: Waits for free token, Changes it to busy, and Transmits own packet and discard what is being received