作业_5

作业_5 -...

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200628017029197 ARQ(Automatic Retransmission Request) R R ARQ(Stop-and-Wait ARQ) 6 s 0 A 0 B A t . B t . B 0 A (ACK); B t . B 0 A 0 t . (NAK); A t B 0 ACK ,p A t ( t . t ) ( t ) t . ACK NAK0 t 0 A 0 B P (SN) t (RN)0 ARQ 0 0 CCS t . 0 SN P RN P t . | CRC t . 10 a S P t . SN0 SN 0 m0 S?m0 update(SN)0 SN m 20 b 0 R P t . | RN 0 R!m0 update(RN) 30 c 0 R 0 CRC P 40 d 0 R t . SN0 =RN 50 t S t . timeout 60 m m , S 0 R 0 m m R 0 m m a! m m b? m 70 k k , R 0 S 0 ack 0 S 0 ack 0 b!ack0 a?ack 80 n n , R 0 S 0 nak 0 S 0 nak 0 b!nak0 a?nak ARQ t . S t R 0 CCS t . 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 . . . . . . . + + = η t . ARQ t . S 0 R t . P=S|R P SN RN 0 CRC
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200628017029197 ARQ P2 . R S P | = ( 29 R k b R k d R n c m S m a . . . . . . . | . . 1 + + = ( 29 ( 29 R k b R k d R n c m S m a . . . . . . . | . . 1 + + = ( 29 ( 29 R k b R k d R n c S I a . . . . . . | . . 1 + + = Q a . = ( 29 R k b R k d R n c S Q . . . . . . | 1 + + = ( 29 ( 29 R k b R k d R n c S m n S m t S k . . . . . . | . . . . . 1 1 + + + + = ( 29 ( 29 ( 29 ( 29 + + + + + + = 1 1 1 . . . . . | . . . . . . . . | . . S m n S m t S k R n c R k b R k d R n c S m t ( 29 ( 29 ( 29 ( 29 1 1 1 1 . . . . . | . . . . . . . | . . S m n S m t S k R k b S m n S m t S k R k d + + + + + ( 29 ( 29 ( 29 ( 29 + + + = 1 1 1 . | . . . | . . . | . . . S m R k b S m R k d S m R n c t ( 29 ( 29 ( 29 + + 1 1 . | . . | . . . S m R I R n S m t c ( 29 ( 29 ( 29 + + R k S m t R S I d . | . . | . . 1 ( 29 ( 29 ( 29
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