Environmental Aware Hierarchical Ad Hoc Network with Multiple Frequency Bands using Weighted Laplacian Matrix

Wireless ad hoc networks have attracted high attention to adapt to multi-hop networks such as wireless mesh network, sensor networks, vehicle-to-vehicle (V2V) networks, and so on. While it has the feature of self-configuring and infrastructure-less, researchers mainly use only one frequency band for a system. In our prior study, we proposed an adaptive spectrum band allocation for topology control and data transmission. Due to its lower attenuation rate, the lower-frequency band is allocated for topology control. On the other hand, we allocated higher-frequency band for data transmission because high-frequency bands can transmit data more rapidly. However, this routing method only considers connectivity between nodes. Thus this method not considers about throughput or stability between nodes. In this paper, we propose a throughput-aware and stability-aware distributed routing scheme for ad hoc network using multiple frequency bands. In this routing method, we use the weighted Laplacian matrix for each node's topology control. Signal-to-Noise Ratio (SNR) is used for the weighted value of the Laplacian matrix. By using weighted Laplacian matrix, we introduce that our method can choose an optimized route by the selected priority. From a number of computer simulations, the improvement of Packet Delivery Ratio (PDR) and throughput, and the reduction of average interference area are confirmed.