Fundamental Investigation of Backoff Control Method for Fair Communication Opportunity of mmW WBAN in Overcrowded Environment

Wireless Body Area Network (WBAN) is a communication system between wearable devices in the human body area. WBAN using millimeter-wave (mmW) is expected to solve the inter- Wbaninterference problem. The human body attenuation is important to reduce the interference, especially in user-dense conditions. In the mm W, due to its straightness and attenuation characteristics, the number of interferers varies de-pending on the location of the WBAN user. However, conventional interference avoidance protocols such as Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) do not consider variations in the number of inter- Wbancollisions. Thus, the fairness of communication opportunities in an overcrowded environment is degraded. In this paper, we propose an inter-WBAN interference avoidance method that selects the optimal Contention Window (CW) size to ensure the communication time of WBAN users. The fairness and total communication time of the proposed method are evaluated by computer simulation. The results show that the proposed method can achieve high fairness even when the interference increases.