Layering of CDMA wireless sensor network cluster to improve network capacity

Abstract

Nowadays, the network capacity of the wireless sensor network is a critical research topic area in the world. As the number of sensors connected to the network is quickly growing, it is important that they can sense and transmit data instantly. One of the approaches to increase the network capacity is clustering the sensors to control communication. The approach will divide sensors into several groups and drive the sensors to send the data through the cluster head. However, the approach will arise inter-cluster interference problems from the sensors near the border that is higher level than other sensors. All of those will cause the fewer sensor that can send the data so that reducing the network capacity. In order to overcome the problem, layering the sensor cluster is proposed which each cluster is divided into two layers. Moreover, the outer layer is divided into four zones and assigned one intermediary sensor in each zone. Sensors in the outer layer will communicate with the cluster head through the intermediary sensors. The method will reduce the transmission power and lessen the interference to other clusters. The approach not only can minimize interference coming from the sensors near the outer layer but also reduce the power consumption. The study concludes that applying the layering technique will drive the sensors near the border to generate minimum interference in their cluster and neighbor clusters. As a result, the network can deliver more capacity than approaches using either only clustering or layering.