Discussion Notes 5

Discussion Notes 5 - EE132B - Recitation 5 ARQ Schemes...

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Unformatted text preview: EE132B - Recitation 5 ARQ Schemes Prof. Izhak Rubin rubin@ee.ucla.edu Electrical Engineering Department UCLA ARQ Schemes Various Schemes: Stop and Wait Go back N Selective Repeat Example: we send a total of 6 packets For Go Back N, use N = 3 P e = 0.25 (for simplicity, assume every fourth packet has an error). Stop and Wait Half duplex It is important to number the packet and ACK P K T 1 A C K 1 P K T 3 A C K 3 transmitter receiver Send PKT 1 Time expires P K T 2 A C K 2 P K T 4 ( e rr o r ) P K T 4 A C K 4 P K T 5 A C K 5 P K T 6 A C K 6 Go back N Full duplex Pipelining Ensure the oldest frame transmitted successfully 1 A C K 1 transmitter receiver Time expires 2 3 A C K 2 A C K 3 4 5 6 Ignored by receiver (out of sequence packets) 4 5 6 A C K 4 5 6 A C K 5 A C K 6 Selective Repeat Full duplex Receiver has the ability to receive out of sequence packet We could have window 1 A C K 1 transmitter receiver 2 3 A C K 2 A C K 3 4 5 6 A C K 5 A C K 6 Time expires A C K 4 4 Example 1...
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Discussion Notes 5 - EE132B - Recitation 5 ARQ Schemes...

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