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20105ee132B_1_hw5

20105ee132B_1_hw5 - UCLA Electrical Engineering Department...

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UCLA Electrical Engineering Department EE132B HW Set #5 Professor Izhak Rubin Problem 1 Consider a selective-repeat ARQ in which the window size N is equal to 4 (i.e., the time out duration allows the transmission of four data frames, including itself). Assume that the originating node wishes to transmit 10 data frames which are labeled D1, D2, …, D10. In this particular session, frames D3, D4 , D8, D10 are retransmitted once, while Frame D2 is retransmitted three times. Other frames do not require retransmission. Draw a simple time diagram demonstrating the correct sequence of events, identifying the timeout threshold used. Problem 2 In a sequence of frame transmissions, data frame D0 has just been positively acknowledged. Four more frames D1, D2, D3, and D4 are transmitted. The next returned transmission, received after D4 has been transmitted, is a negative acknowledgement to D2. Assume that this implicitly acknowledges any previously transmitted but unacknowledged data frames.
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