Sensor integration underlying cellular networks through MC-CDMA and mobile sink

We propose an energy-efficient method to enable the data collection of wireless sensor networks (WSNs) assisted by a cellular network. They use the same radio resources in an underlay manner resulting in bandwidth efficiency improvements. During the sensor data collection (SDC) period, the cellular user functions as a mobile sink node while keeping the normal cellular traffic, and multicarrier code-division multiple-access (MC-CDMA) transmission is utilized in the sensor-to-sink. Since the energy of sensor symbols from MC-CDMA transceiver is small and spread in the frequency domain, it eventually gives only rise to noise-level of each sub-carrier. After formulating the SDC procedure, we analyze the bit error probability of both the cellular traffic and sensor transmission. From the simulation results, the proposed algorithm is proved to be efficient.