Method for discovering intra-session network coding opportunity in wireless ad hoc networks

Transcription

1 32 10 Vol.32 No Journal on Communications October , AODV AODV TN393 B X(2011) Method for discovering intra-session network coding opportunity in wireless ad hoc networks DONG Chao 1, 2, QIAN Rui 2, CHEN Gui-hai 1, WANG Hai 2 (1. State Key Laboratory of Novel Software Technology, Nanjing University, Nanjing , China; 2. Institute of Communication Engineering, PLAUST, Nanjing , China) Abstract: Coding opportunity is critical to the performance of intra-session network coding in ad hoc networks. However, coding opportunity can not be discovered effectively with most distance-vector routing protocols including AODV which only knows one-hop neighbor node information. From the aspect of how much network topology information needs to be known, the condition under which the coding opportunity can be discovered effectively was proposed and the sufficiency and necessity of the condition was analyzed. Also the condition was implemented based on AODV routing protocol and validated with the help of real experiment and simulation. The results show that the proposed condition is correct and can improve the performance of wireless ad hoc networks effectively. Key words: network coding; coding opportunity; network topology; wireless ad hoc networks [1~3] [4] [5] 2006 Katti COPE [6] A a B B b A A B R 1(a) 4 R a b (XOR) CB BK Foundation Items: The National Basic Research Program of China (973 Program) (2009CB302402); The National Natural Science Foundation of China ( ); The Natural Science Foundation of Jiangsu Province (BK )

2 A B 1 1 a XOR b 1 a XOR b XOR c 2 1 (a) (b) 1 COPE COPE COPE [6~9] COPE N (N 1) COPE 2 COPE C A B C c B B A C B A c [6] 50% Katti Srcr [10] COPE Srcr COPE AODV 1) 2) AODV AODV [11,12] COPE COPE Chaporkar [7] COPE

3 94 32 Le [8] COPE COPE Kuo [9] Le DCAR [13] [14] mesh [16] [16] COPE 3 R S p R p A R S A S A S A S 2 2 S p R A S A p R S S p S A p R A p A S 3 A p S

4 10 95 A p S M (M 2) 3 S B B R p R p B A A B R p A p 2 R A p 4 AODV AODV (ad-hoc on-demand distance vector) [17] AODV 2 AODV AODV 4.1 IP 3 2 A S A S 2 3 R p S B p B p A A p 4 AODV 4 S p R B p E S R R S R B B E R p IP p E R p B S B p

5 AODV Hello Hello 5 Hello Hello Hello AODV AODV 1Mbit/s 512byte 500s 6 X s 500kbit/s 5.1 X 6 X A C B D 2 R R 2 6 X 5 Hello Hello X 7 (saturation) AODV- AODV 2 [6] 8 AODV- AODV 5 IEEE [6] 2 Click [18] AODV AODV- 7 X

6 X 5.2 Cross 9 Cross 4 R R 4 10 AODV- 4 [6] 11 9 Cross 11 Cross 2 6 Qualnet [19] 1000m 1 000m m MAC TDMA 10 UDP Hello 1s AODV- AODV- AODV- AODV 12 AODV- AODV- AODV- 10 Cross 12

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