Interference-aware Topology Control In Wireless Sensor Network

For most of wireless sensor network applications, wireless sensor nodes often share a specified channel due to the constraints of the spectrum and costs. Consequently, such co-channel wireless sensor networks often experience link interferences caused by concurrent transmissions of close-by links. Link interferences significantly deteriorate the efficacy of packet delivery and waste the precious resources of the energy and bandwidth of nodes. Therefore, reducing link interferences in wireless Ad hoc and sensor networks with shared channel is a challenging research topic. Topology control is an important way of reducing the link interference in wireless Ad hoc and sensor networks with shared channel. Modeling link interference is the primary step for designing interference-aware topology controls, and it is very critical to the efficacy of the topology control schemes in use.After analysing the shortcomings facing the previous works on interference modeling, this paper presents a new link interference model, which can not only be easily calculated with global or local algorithms, but also more effectively profile the link interference in co-channel wireless Ad hoc and sensor networks than previous models. Based on the proposed model, a centralized topology control algorithm and a distributed topology control are designed to construct interference-optimal topologies. In fact, our model can also be fed into most of already-existed topology control algorithms aimed at reducing link interferences. Finally, for the centralized topology control algorithm, extensive simulations and analysis are conducted to evaluate our designs in detail. The simulation results show the outstanding effectiveness of interference reduction achieved by our model and algorithm, in comparison with the previous work.