| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 91 ===
In wireless ad hoc networks which without centralize control, it
is important that all mobile hosts are synchronized to a common
clock to avoid data loss. IEEE 802.11 standards specified the
clock synchronization method to solve the problem. But this method
can't solve the scalability problem of wireless ad hoc networks,
especially in a multi-hop {it mobile ad hoc networks (MANETs)}.
In this paper, we proposed a clock automatic adjustment algorithm
to solve the problem. First, we let the faster mobile hosts have
high priority to send out the timing information. Then, the other
mobile hosts got the difference from the faster one, and got the
adjustment value to synchronize automatic to keep all mobile hosts
are synchronized in a multi-hop MANET. Simulation results show
that our clock automatic adjustment algorithm decrease 60\%
average maximum clock drift of IEEE 802.11 synchronization method,
and effective in reducing the occurring times of asynchronous
cases in a large-scale multi-hop MANET.
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