作业_50

作业_50 -...

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Unformatted text preview: 200628017029197 ARQ(Automatic Retransmission Request) R R ARQ(Stop-and-Wait ARQ) * k4 b b 4 A 0 B A 4 k B 4 k B 0 A (ACK); B 4 B 0 A (NAK); A 4 B 0 ACK 4 k A 4 ( t ) 4 ( 4 )0 4 k ACK A NAK 4 k A 0 B 6 s 4 (SN) 4 (RN)0 ARQ 0 CCS 4 k SN b RN b4 k* CRC 4 k 10 a S b4 k SN0 SN 0 m0 s?m0 update(SN)0 SN m 20 b R b 4 k* RN 0 r!m0 update(RN) 30 c R 0 CRC b 40 d R 4 k SN0 =RN 50 t S 4 k timeout 60 m m , S 0 C 0 m b C 0 m b s! m b c? m 70 m m , C 0 R 0 m R 0 m c! m r? m 80 k k , R 0 B 0 ack 0 B 0 ack 0 r!ack0 b?ack 90 k k , B 0 S 0 ack 0 S 0 ack 0 b!ack0 s?ack 100 n n , R 0 B 0 nak 0 B 0 nak 0 r!nak0 b?nak 110 n n , B 0 S 0 nak 0 S 0 nak 0 b!nak0 s?nak 120 m l m 4 k 130 k l ack 4 k 140 n l nak 4 k SN RN CRC 200628017029197 B ARQ ; k S ; R 0 CCS ; k 1 . . S m a S = 1 1 1 . . . . . S m n S m t S k S + + = ( 29 R k b R k d R n c m R . . . . . . . + + = ( 29 C l C m m C m . '. . + = ( 29 ( 29 B l B k k B l B n n B k n . '. . . '. . + + + = ; k ARQ ; k S0C0R0B ; k P=S|C|R|B0 * k4 b b ARQ b ( 29 ( 29 V U B R C S B R C S P | | | | | | | = = = ( 29 C l C m m S m a U m . '. . | . ....
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作业_50 -...

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