The SMART Handoff Policy for Millimeter Wave Heterogeneous Cellular Networks
The SMART Handoff Policy for Millimeter Wave Heterogeneous Cellular Networks
复制标题
毫米波异构蜂窝网络的智能切换策略
DOI：
10.1109/tmc.2017.2762668
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发表时间：
2018-06-01
影响因子：
7.9
通讯作者：
Yum, Tak-Shing Peter
中科院分区：
文献类型：
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作者：
Sun, Yao;Feng, Gang;Yum, Tak-Shing Peter
毫米波（mmWave）无线电频带由于其可用于满足移动的业务的增长的需求的大带宽而被用于下一代异构蜂窝网络（HetNet）。然而，在毫米波频带处的独特传播特性在毫米波HetNet中导致巨大的冗余切换，如果使用传统的基于参考信号接收功率（RSRP）的切换机制，则会带来沉重的信令开销、低能量效率和增加的用户设备（UE）中断概率。在本文中，我们提出了一个强化学习为基础的切换策略，名为SMART，以减少切换的数量，同时保持用户的服务质量（QoS）的要求在毫米波HetNet。在SMART中，我们通过考虑毫米波信道特性和UE的QoS要求来确定切换触发条件。此外，我们提出了基于重复学习的BS选择算法，用于不同的UE密度。数值结果表明，在典型的情况下，SMART可以显着减少切换的数量相比，传统的切换策略没有学习。
The millimeter wave (mmWave) radio band is promising for the next-generation heterogeneous cellular networks (HetNets) due to its large bandwidth available for meeting the increasing demand of mobile traffic. However, the unique propagation characteristics at mmWave band cause huge redundant handoffs in mmWave HetNets that brings heavy signaling overhead, low energy efficiency and increased user equipment (UE) outage probability if conventional Reference Signal Received Power (RSRP) based handoff mechanism is used. In this paper, we propose a reinforcement learning based handoff policy named SMART to reduce the number of handoffs while maintaining user Quality of Service (QoS) requirements in mmWave HetNets. In SMART, we determine handoff trigger conditions by taking into account both mmWave channel characteristics and QoS requirements of UEs. Furthermore, we propose reinforcement-learning based BS selection algorithms for different UE densities. Numerical results show that in typical scenarios, SMART can significantly reduce the number of handoffs when compared with traditional handoff policies without learning.