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A Dynamic Load Balancing Algorithm in Heterogeneous Network

机译：异构网络中的动态负载平衡算法

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摘要

Heterogeneous network (HetNet) is one of the key architectures in 3rd Generation Partnership Projects (3GPP), in which lower-power but more flexible Pico base station (PBS) is appended. The original homogeneous base station stays the same and is called Macro base station (MBS) in HetNet. The traditional network admission and handover is performed by the reference signal received power (RSRP), which is positively related to transmission power. Consequently, the lower-power PBS will be unattractive to user equipment (UE), resulting in feeble performance enhancement of HetNet and imbalance load between MBS and PBS. This paper investigates a dynamic load balancing algorithm to solve this load-imbalance problem that deteriorate 3GPP LTE network system performance. The algorithm is based on the heterogeneous network access function (HNAF) which is deduced from network fairness analysis according to load status of different bases. Meanwhile, the algorithm is realized through traffic transfer scheme, and is designed as a suboptimal but practical solution. Simulation results show that the proposed algorithm gains a better performance on throughput, access success rate and the interlayer fairness compared with existing scheme.
机译：异构网络（HetNet）是第三代合作伙伴计划（3GPP）中的关键体系结构之一，在该体系结构中附加了功耗较低但更灵活的Pico基站（PBS）。原始的同类基站保持不变，在HetNet中称为宏基站（MBS）。传统的网络准入和切换由参考信号接收功率（RSRP）执行，该信号与传输功率成正比。因此，较低功率的PBS对用户设备（UE）不会具有吸引力，从而导致HetNet的性能微不足道，并且MBS和PBS之间的负载不平衡。本文研究了一种动态负载平衡算法，以解决这种导致3GPP LTE网络系统性能下降的负载不平衡问题。该算法基于异构网络访问功能（HNAF），该功能是根据不同基站的负载状态通过网络公平性分析得出的。同时，该算法通过流量传输方案实现，被设计为次优但可行的解决方案。仿真结果表明，与现有方案相比，该算法在吞吐量，访问成功率和层间公平性方面都有较好的表现。

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