【摘要】：在樹形拓?fù)渌晜鞲芯W(wǎng)絡(luò)中,時分多址(TDMA)機(jī)制存在信道利用率低的問題。為此,提出一種輕量級的流量自適應(yīng)隨機(jī)訪問與TDMA的混合MAC協(xié)議。該協(xié)議在網(wǎng)絡(luò)流量較低時采用S-ALOHA競爭機(jī)制提高信道利用率,運(yùn)用最優(yōu)化算法計算分配給簇內(nèi)子節(jié)點(diǎn)的最大發(fā)送概率,通過流量自適應(yīng)的靈活時隙分配機(jī)制以適應(yīng)不同的網(wǎng)絡(luò)流量。實驗結(jié)果表明,該協(xié)議不僅能夠提高樹形拓?fù)渚W(wǎng)絡(luò)中節(jié)點(diǎn)的通信效率,能減少子節(jié)點(diǎn)的等待時間。
[Abstract]:In the tree-topology underwater acoustic sensor networks, the channel utilization rate is low in the TDMA (time Division multiple access) (TDMA) (TDMA) mechanism. For this reason, a lightweight traffic adaptive random access protocol and a hybrid MAC protocol for TDMA are proposed. When the network traffic is low, the S-ALOHA competition mechanism is used to improve the channel utilization, and the optimal algorithm is used to calculate the maximum transmission probability assigned to the sub-nodes in the cluster. Adaptive time slot allocation mechanism is used to adapt to different network traffic. Experimental results show that the proposed protocol can not only improve the communication efficiency of the nodes in the tree topology network, but also reduce the waiting time of the sub-nodes.
【作者單位】： 上海海事大學(xué)信息工程學(xué)院;
【基金】：國家自然科學(xué)基金(60972047) 上海市教育委員會科研創(chuàng)新項目(S2012388)
【分類號】：TN929.3;TP212.9

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