Performance Analysis of Backhaul-Aware User Association in 5G Ultradense Heterogeneous Networks
Performance Analysis of Backhaul-Aware User Association in 5G Ultradense Heterogeneous Networks
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DOI：
10.1155/2021/8879690
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发表时间：
2021
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影响因子：
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通讯作者：
Junpeng Yu;Hongtao Zhang;Yuqing Chen;Yaduan Ruan
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文献类型：
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作者：
Junpeng Yu;Hongtao Zhang;Yuqing Chen;Yaduan Ruan
在5G超密集异构网中，无线回程作为影响用户业务的重要基站资源之一，受到越来越多的关注。然而，基于传统的用户关联方案，用户将接入离用户最近的BS，这由于有限的回程容量而限制了网络性能的提高。利用回程感知的用户关联机制，推导了超密集异质网络中网络性能指标的半封闭表达式，包括覆盖概率、速率覆盖和网络时延。具体地说，考虑了BSS和锚基站(A-BS)用户可连接范围内的所有可能的接入和回程链路，以最小化中断概率的分析结果。仅当形成具有最佳性能的链路组合的接入链路或回程链路发生故障时，才会发生用户的中断。此外，理论分析和数值结果评估了A-BSS的比例和BS/用户密度比对网络性能指标的影响，以寻求在实际场景中更合理地部署BSS。仿真结果表明，在回程受限的情况下，回程感知用户关联方案的覆盖概率比传统用户关联方案显著提高了约2倍。
In 5G ultradense heterogeneous networks, wireless backhaul, as one of the important base station (BS) resources that affect user services, has attracted more and more attention. However, a user would access to the BS which is the nearest for the user based on the conventional user association scheme, which constrains the network performance improvement due to the limited backhaul capacity. In this paper, using backhaul-aware user association scheme, semiclosed expressions of network performance metrics are derived in ultradense heterogeneous networks, including coverage probability, rate coverage, and network delay. Specifically, all possible access and backhaul links within the user connectable range of BSs and anchor base stations (A-BSs) are considered to minimize the analytical results of outage probability. The outage for the user occurs only when the access link or backhaul link which forms the link combination with the optimal performance is failure. Furthermore, the theoretical analysis and numerical results evaluate the impact of the fraction of A-BSs and the BS-to-user density ratio on network performance metric to seek for a more reasonable deployment of BSs in the practical scenario. The simulation results show that the coverage probability of backhaul-aware user association scheme is improved significantly by about 2× compared to that of the conventional user association scheme when backhaul is constrained.