Dynamic Spectrum Utilization with Secure Sensing in E-Healthcare System

To enhance the quality of medical care, e-healthcare system becomes a promising system which integrates diverse wireless devices and technologies such as internet of things, wireless body area networks, etc. However, numerous wireless devices and communication requirements will cause the shortage of the wireless spectrum. Cognitive radio is able to exploit spectrum opportunities and increase the communication performance for the e-healthcare system. To access the spectrum safely, the security aspect of spectrum utilization should be carefully addressed. A well-known threat to the spectrum utilization is the primary user emulation attack (PUEA) in which the attackers emulate as the primary users to obtain spectrum opportunities. To defend this threat, in this paper, we propose a triple threshold energy detection (TTED) to identify the PUEA. Based on the TTED, legitimate devices are allowed to access the available channels when the licensed channel is idle or occupied by attackers. To evaluate our proposed access scheme, we derive the achievable throughput while the average transmission time is fixed and exponential distributed, respectively.