Global Optimization for Multi-Channel Wireless Data Broadcast with AH-Tree Indexing Scheme

Multi-channel wireless data broadcast is an appropriate approach to disseminate data to a mass number of mobile clients. In this paper, we present a global optimization for multi-channel wireless data broadcast with Alphabetic Huffman Tree (AH-Tree) Indexing scheme, which can deal with skewed access frequencies well. We present three novel designs to reduce the access latency and tuning time of the broadcast system. Firstly, we design a dynamic programming for AH-Tree construction with low time complexity. Compared with traditional Hu-Tucker algorithm in <inline-formula> <tex-math notation="LaTeX">$O(n^k)$</tex-math><alternatives> <inline-graphic xlink:type="simple" xlink:href="yang-ieq1-2479603.gif"/></alternatives></inline-formula>, our algorithm can build a <inline-formula><tex-math notation="LaTeX">$k$</tex-math><alternatives> <inline-graphic xlink:type="simple" xlink:href="yang-ieq2-2479603.gif"/></alternatives></inline-formula>-ary AH-Tree index in <inline-formula><tex-math notation="LaTeX">$O(n^2)$</tex-math><alternatives> <inline-graphic xlink:type="simple" xlink:href="yang-ieq3-2479603.gif"/></alternatives></inline-formula>. Next, we depict a new control table design, which eliminates up to 50 percent redundant entries while keeps the searching efficiency. We also theoretically prove that an optimal alphabetic tree has the minimum average tuning time among all tree-based index structures for skewed data broadcast. Thirdly, we design the new index and data allocation algorithms to further reduce the tuning time and access latency. The simulation results validate the effectiveness of our algorithms. In all, our global optimization mechanism can greatly improve the system performance and time efficiency for wireless data broadcast applications.

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