Joint power and timeslot allocation based on delay priority for multi-beam satellite downlinks

This paper investigates the joint power and timeslot allocation for multi-beam satellite downlinks. Users with real-time and non-real-time services under different channel conditions are considered to be satisfied with limited power and timeslots. To guarantee the fairness among different users, the delay priority is introduced for optimization, while the delay constrain is used to avoid delay deterioration of real-time users. Based on this, a joint power and timeslot allocation problem is formulated to maximize the weighted sum throughput. With convex optimization theory, the optimal power and timeslot allocation is derived, and a joint allocation algorithm based on subgradient method is proposed to determine the optimal solutions. Simulation results show that the proposed algorithm realize the trade-off between throughput and loss probability with delay fairness guarantee.