Research on cognitive user's time allocation algorithm on the mobile scene of primary users

Traditional cognitive radio techniques mainly aim at the primary user and cognitive user in static. For the past few tears, the research on the mobility of the user has become a hot research topic, the cognitive network is widely used in multimedia access technology, and the protocols of multimedia access technology are mostly based on the allocation of time. This paper focuses on time allocation method of cognitive users under mobile scenarios of primary users. In this paper, we firstly construct the time distribution model of the primary user in and out of the interference region of the cognitive radio network. From the view of the user's movement, the available transmission time for a single user and the problem of sensing time threshold are put forward. Secondly, Because of the mobility of the primary users, the sensing accurate of spectrum sensing algorithm would not be improved although using the longer sensing time. In order to give the time parameter design method of the application, especially for the random walk model which is most commonly used, a single user's optimal transmission time and sensing time threshold are given. The simulation is completed to verify the correctness of the algorithm.