Abstract:

In IPv6 over low-power wireless personal area networks (6LoWPAN) based on Mesh-under, the retransmission buffer of an intermediate node overflows that it could cause the retransmission fragmentations missing, which results in the degraded network performance and other issues, an auxiliary cache mechanism based on Mesh-under is proposed. According to the retransmission buffer usage of the nodes on the transmission path and the remaining hop count of the fragmentation, the dynamic retransmission cache threshold is set by the mechanism, and then a suitable auxiliary cache node from the neighbor nodes of the relay node is selected. Thus, the fragmentation’s cache and retransmission procedure is completed and the goal that the cache of the nodes is used proportionately is achieved. Simulation results show that the proposed mechanism can effectively avoid the retransmission buffer overflow, reduce energy consumption and further improve the destination node’s recombination rate.