localized network coding can greatly improve the throughput of wireless mesh networks. In a typical practical wireless transmission mechanism using localized network coding, such as COPE, to make decision which forwar...
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ISBN:
(纸本)9780769550886
localized network coding can greatly improve the throughput of wireless mesh networks. In a typical practical wireless transmission mechanism using localized network coding, such as COPE, to make decision which forwarding packets should be coded together, each node needs to broadcast a notification message every tau interval time to inform their neighbors which packets they have buffered currently. However, the tau-interval-notification mechanism will incur non-negligible overhead, especially when tau is small, and it is difficult to determine the value of tau due to the unbalanced network payload. In this paper, we analyzed the overhead of the tau-interval-notification mechanism, and proposed a novel lightweight reception-report-notification mechanism, named ARSM, for localized network coding, in which a node will be triggered to send notification of reception reports when it has buffered k new packets, and each notification will include information of 2k latest buffered packets to decrease the message size of the notification and guarantee the coding efficiency meanwhile. Simulation results show that ARSM can achieve higher coding efficiency with less overhead, and a coding aware transmission mechanism based on ARSM will achieve a higher throughput than the one based on the tau-interval-notification mechanism.
Efficient and reliable communications is a critical issue in wireless networks with lossy links. In this paper, we propose a neighbor-assisted coding aware opportunistic retransmission mechanism to increase the networ...
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ISBN:
(纸本)9781424441471
Efficient and reliable communications is a critical issue in wireless networks with lossy links. In this paper, we propose a neighbor-assisted coding aware opportunistic retransmission mechanism to increase the network throughput. The key idea behind our design is as follows. If a node fails to receive a packet due to link loss, its neighboring node(s) receiving the packet can assist the retransmission of the packet, possibly encoded with other packet(s) via localized network coding, if such retransmission is expected to be beneficial. This can effectively reduce the total number of packet retransmissions at the MAC layer. Simulation results show that our proposed mechanism can significantly increase the network throughput as compared with existing work.
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