面向无线己布匹局网绕干用优募化的拓扑把持切磋

Secondly, the topology control for ad hoc networks with directional antennas is

investigated, in order to maintain network connectivity while reducing node energy

consumption and increasing network capacity.

A distributed neighbor-based topology control approach for ad hoc networks with

steered beam antennas, referred to as the DK-Neigh, is proposed to maintain the

outdegree of every node equal to or slightly below a specific value K . Quadrat

statistical methods are employed to derive analytical expressions to determine the

critical transmission range and neighbor number K . The approach can build the

resulting communication graph with high probability connected. Extensive

simulations are carried out, which show that the DK-Neigh is to achieve a high

probability (more than 96 percent) of connectivity. If width of beam is smaller than 60

degree, average energy cost of nodes is reduced at least 15 percent than the topology

control protocol K-Neigh using omni-directional antennas. Simulations show the

DK-Neigh is more energy-efficient while maintaining network connectivity.

A localized topology control algorithm for Ad hoc networks with steered beam

directional antennas, referred to as the BATC, is proposed in this thesis. The topology

is controlled not only by adjusting the transmission powers of nodes but also by

changing the directional antenna’s direction. The centralized algorithm preserves the

connectivity of the resulting topology. At the same time, the resulting network

topology reduces energy consumption, decreases traffic interference and improves

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