Downlink Performance of Cellular Systems With Base Station Sleeping, User Association, and Scheduling
Downlink Performance of Cellular Systems With Base Station Sleeping, User Association, and Scheduling
复制标题
DOI：
10.1109/twc.2014.2336249
复制
发表时间：
2014-01
影响因子：
10.4
通讯作者：
H. Tabassum;Uzma Siddique;E. Hossain;Md. Jahangir Hossain
中科院分区：
文献类型：
--
作者：
H. Tabassum;Uzma Siddique;E. Hossain;Md. Jahangir Hossain
基站（BS）休眠已经成为一种可行的解决方案，以通过停用未充分利用的BS来提高整体网络能量效率。然而，它影响睡眠小区中的用户的性能，这取决于他们的BS关联准则、他们朝向活动BS的信道条件以及活动BS处的调度准则和业务负载。本文通过建立一个系统的框架，推导出考虑到上述因素的频谱效率和下行链路传输到睡眠小区用户的中断概率的蜂窝系统的性能与BS睡眠。在此上下文中，还开发了用户关联方案，其中休眠小区用户关联到具有最大平均信道接入概率（MMAP）的BS。基于MMAP的用户关联方案根据活动BS处的业务负载和调度准则来适配。我们认为贪婪和循环计划在活跃的BS调度用户在信道中。我们还推导出传统的最大接收信号功率（MRSP）为基础的用户关联方案的分析结果。最后，我们推导出的接收信号和干扰功率的统计来评估一个给定的睡眠小区用户的下行链路频谱效率。数值结果提供了两个用户关联方案作为系统参数的函数之间的比较，并证明了在非均匀的流量负载的情况下，基于MMAP的关联方案的功效。
Base station (BS) sleeping has emerged as a viable solution to enhance the overall network energy efficiency by inactivating the underutilized BSs. However, it affects the performance of users in sleeping cells depending on their BS association criteria, their channel conditions toward the active BSs, and scheduling criteria and traffic loads at the active BSs. This paper characterizes the performance of cellular systems with BS sleeping by developing a systematic framework to derive the spectral efficiency and outage probability of downlink transmission to the sleeping cell users taking into account the aforementioned factors. In this context, a user association scheme is also developed in which sleeping cell users associate to a BS with maximum mean channel access probability (MMAP). The MMAP-based user association scheme adapts according to traffic load and scheduling criteria at the active BSs. We consider greedy and round-robin schemes at active BSs for scheduling users in a channel. We also derive the analytical results for the conventional maximum received signal power (MRSP)-based user association scheme. Finally, we derive the statistics of the received signal and interference power to evaluate the downlink spectral efficiency of a given sleeping cell user. Numerical results provide a comparison between two user association schemes as a function of system parameters and demonstrate the efficacy of the MMAP-based association scheme in non-uniform traffic load scenarios.