Y. Ohtaki, N. Wakamiya, M. Murata, and M. Imase (Japan)
Wireless Networks, Ant algorithms, Routing, Scalability.
Ants-based routing algorithms have attracted the attention of researchers because they are more robust, reliable, and scalable than other conventional routing algorithms. Since they do not involve extra message exchanges to maintain paths when network topology changes, they are suitable for mobile ad-hoc networks where nodes move dynamically and topology changes frequently. As the number of nodes increases, however, the number of ants (i.e., mobile agents or control messages) also increases and it reduces the scal ability of algorithms. In this paper, we propose a scalable ant-based routing algorithm that makes the overhead low while keeping paths short. Our algorithm uses a multistep TTL (Time To Live) scheme, an effective message migra tion scheme, and an efficient scheme for updating the prob ability of packet forwarding. Simulation experiments have confirmed that our proposed algorithm can establish shorter paths than the conventional ant-based algorithm with the same signaling overhead.
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