Availability Analysis and Optimization in CoMP and CA-enabled HetNets

Availability Analysis and Optimization in CoMP and CA-enabled HetNets
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CoMP 和支持 CA 的 HetNet 中的可用性分析和优化

DOI:
10.1109/tcomm.2017.2679747
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发表时间:
2017-06
影响因子:
8.3
通讯作者:
Arumugam Nallanathan
Arumugam Nallanathan
中科院分区:
计算机科学2区
文献类型:
--
作者:
Jie Jia;Yansha Deng;Jian Chen;Abdol-Hamid Aghvami;Arumugam Nallanathan

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传统的蜂窝网络正在向异构蜂窝网络(HetNets)发展,以满足对数据速率和容量的严格要求。为了实现5G中的新应用,例如触觉通信,我们面临着在HetNets中实现高可用性和低延迟的新挑战。在本文中,我们在HetNets中引入协调多点(CoMP)和载波聚合(CA)技术来保证所有用户设备(UE)的可用性,其中CoMP提高了单路径可用性,CA通过多载波增益组合来提高可用性。为了描述可用性,我们首先推导了CoMP和ca支持的HetNets中随机UE可用性的精确封闭表达式。为了实现最大的UE可用性,我们制定了一个最大最小优化问题。为了解决这一问题,我们提出了两步优化算法(TSOA)和联合优化算法(JTOA)。TSOA基于启发式算法进行最优子载波分配和UE关联,基于拉格朗日对偶方法进行功率分配。JTOA是基于遗传算法来实现第一步和第二步之间的交互。我们的结果显示了我们提出的JTOA的有效性,以及CoMP在提高HetNets可用性方面的有效性。
Traditional cellular networks are moving toward heterogeneous cellular networks (HetNets) to satisfy the stringent demand for data rates and capacity. To enable the new applications in 5G, such as haptic communications, we face new challenges of achieving high availability with low latency in HetNets. In this paper, we introduce coordinated multi-point (CoMP) and carrier aggregation (CA) techniques in HetNets to guarantee the availability of all user equipment (UE), where the CoMP improves the single-path availability, and the CA enhances availability via multi-carrier gain combining. To characterize the availability, we first derive an exact closed-form expression for the availability of a random UE in a CoMP and CA-enabled HetNets. To achieve the maximum UE availability, we formulate a max-min optimization problem. To solve it, we then propose a two-step optimization algorithm (TSOA) and a joint (JTOA). The TSOA is based on heuristic algorithm for the optimal subcarrier assignment and UE association, and based on the Lagrangian dual method for the power allocation. The JTOA is based on genetic algorithm to achieve the interaction between the first step and the second step. Our results showcase the effective of our proposed JTOA, and the effective of the CoMP in availability improvement in HetNets.
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