A QoS-Guaranteed Component Carrier Selection Algorithm for LTE-U and WiFi Coexistence Networks
Liangyu Chu, Jun Jie Zheng, Jie Xiao · 2019
This paper studies the component carrier selection (CCS) problem in an LTE-U and WiFi coexistence network, taking into account the throughput requirements of LTE-U users. Two types of LTE-U users are considered, i.e., type-1 users with minimum throughput requirement and type-2 users without minimum throughput requirement. The CCS problem is formulated as an optimization problem with the objective to select an optimal CC among all CCs for each LTE-U user, either type-1 or type- 2, such that the throughput of each type-2 user on the selected CC is maximized while the minimum throughput requirement of both the type-1 users and WiFi users are guaranteed. An enhanced carrier sense adaptive transmission (CSAT-e) mechanism is first presented to coordinate the transmission of LTE-U type-1 users, LTE-U type-2 users and WiFi users on the same component carrier. Based on that, a heuristic QoS-guaranteed CCS (Q-CCS) algorithm is proposed for solving the formulated CCS problem. Simulation results are shown to evaluate the performance of the proposed Q-CCS algorithm in terms of the system utility.