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近年来,为满足移动数据爆发性的增长需求,LTE与WLAN共同组成的异构网络逐渐成为研究的焦点。在这样的场景下,当每个用户同时配备LTE和WLAN收发器时,用户体验更能获得巨大的改善。然而,由于两个系统之间的协同存在障碍,联合管理无线资源比较困难。因此,文中考虑同时优化LTE系统中的信道分配和WLAN系统中的用户关联的问题,证明了这两个问题都可以转化成相交拟阵下的次模函数,并利用了一个基于次梯度的算法对这两个问题分别求解,最终通过LTE和WLAN系统中交替使用该优化算法提高全网吞吐量。
In recent years, in order to meet the explosive growth of mobile data, a heterogeneous network composed of LTE and WLAN has gradually become the focus of research. In this scenario, the user experience can be significantly improved when each user is equipped with both LTE and WLAN transceivers. However, because of the synergies between the two systems, joint management of wireless resources is difficult. Therefore, in this paper, the problem of channel assignment in LTE system and user association in WLAN system is optimized. It is proved that both of these two problems can be transformed into the submodular functions under the cross-fitting matrix and a sub-gradient based algorithm Solve these two problems separately, and finally improve the whole network throughput by alternately using the optimization algorithm in LTE and WLAN systems.