超密集组网是5G网络中满足日益增长业务量需求的关键技术之一。近年来，在由长期演进（LTE）小基站密集组网构成的超密集网络中，用户和业务数量快速增长，为了在无线网络中更好地保证用户的服务质量（QoS），提升网络吞吐量，文章提出一种基于跨层有效容量的接入控制算法，该算法综合考虑用户QoS和信道状况，并且定义小基站的选择因子来决定用户设备接入的LTE小基站，在保证用户QoS的基础上，使得每个LTE小基站负载均衡，从而最大化超密集网络的容量。仿真结果表明，与传统算法相比，所提算法能够在保证用户QoS的同时显著提高系统容量。

To meet the growing demand for traffic, ultra-dense network is one of the key technologies for the 5G network. In recent years, the number of users and services increase rapidly in the ultra-dense network composed of Long Term Evolution (LTE) small base stations. The paper proposes an access control algorithm based on the cross-layer effective capacity, which can ensure the Quality of Service (QoS) of users and increase the throughput of the network. The algorithm considers the QoS requirements and the channel condition. It also defines the selection factor to determine the accessed LTE small base station. Therefore, load balance can be realized in each LTE small base station resulting in maximum effective capacity of ultra-dense network on the basis of ensuring the QoS of users. The simulation results show that compared with the traditional algorithm, the algorithm proposed in this paper can improve the system capacity significantly while guaranteeing the users’ QoS.