Revisiting the TTL-based controlled flooding search: optimality and randomization

13 years 9 months ago

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In this paper we consider the problem of searching for a node or an object (i.e., piece of data, ﬁle, etc.) in a large network. Applications of this problem include searching for a destination node in a mobile ad hoc network, querying for a piece of desired data in a wireless sensor network, and searching for a shared ﬁle in an unstructured peer-to-peer network. We limit our attention in this study to the class of controlled ﬂooding search strategies where query/search packets are broadcast and propagated in the network until a preset TTL (time-to-live) value carried in the packet expires. Every unsuccessful search attempt results in an increased TTL value (i.e., larger search area) and the same process is repeated. The primary goal of this study is to derive search strategies (i.e., sequences of TTL values) that will minimize the cost of such searches associated with packet transmissions. The main results of this paper are as follows. When the probability distribution of the lo...

Nicholas B. Chang, Mingyan Liu

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