A call admission control scheme in cache-enabled satellite-terrestrial communication networks

Satellite-terrestrial communication network has been proposed in recent years, for its great potential in larger coverage and better load balancing ability for wireless communication networks. However, with the number of users and the traffic load in the network rapidly increasing, the resource of the system becomes more intense. Thus, a proper and high-efficient call admission control scheme is needed to balance the traffic load and properly allocate the limited wireless resources. This paper presents a call admission control scheme with additional consideration of users' Quality of Service (QoS) and cache technique. Firstly, a system model of the satellite-terrestrial communication network is introduced. After that, an objective function of the system throughput is derived and laterly optimized with genetic algorithm. Simulation result shows that higher system throughput can be achieved with the proposed scheme, while the QoS of users remains uninfluenced. Besides, the Call Blocking Probability (CBP) of the system is reduced efficiently, and the resource utilization is improved at the same time.