[论文解读] Performance Evaluation of a Deployed 4G LTE Network

Eric Tutu Tchao, James Dzisi Gadze+1 more|arXiv (Cornell University)|Apr 2, 2018

Advanced MIMO Systems Optimization参考文献 17被引用 3

一句话总结

本论文通过仿真（Genex Unet）和实地测量，评估了在加纳的西非撒哈拉以南地区地形中部署的4G LTE网络性能，重点关注2600 MHz频段下的2x2、4x4和8x8 MIMO配置。4x4 MIMO配置实现了更高的平均吞吐量，但2x2 MIMO在覆盖可靠性方面表现更优，有60.41%的区域达到1–40 Mbps的速率，而4x4 MIMO为55.87%。

ABSTRACT

In Ghana and many countries within Sub-Sahara Africa, Long Term Evolution (LTE) is being considered for use within the sectors of Governance, Energy distribution and transmission, Transport, Education and Health. Subscribers and Governments within the region have high expectations for these new networks and want to leverage the promised enhanced coverage and high data rates for development. Recent performance evaluations of deployed WiMAX networks in Ghana showed promising performance of a wireless broadband technology in supporting the capacity demands needed in the peculiar Sub-Saharan African terrain. The deployed WiMAX networks, however could not achieve the optimal quality of service required for providing a seamless wireless connectivity demands needed for emerging mobile applications. This paper evaluates the performance of some selected key network parameters of a newly deployed LTE network in the 2600 MHz band operating in the peculiar Sub-Saharan African terrain under varied MIMO Antenna Configurations. We adopted simulation and field measurement to aid us in our evaluation. Genex Unet has been used to simulate network coverage and throughput performance of 2X2, 4X4 and 8X8 MIMO configurations of the deployed networks. The average simulated throughput per sector of 4X4 MIMO configuration was seen to be better than the 2X2 configuration. However, the percentage coverage for users under the 2x2 MIMO simulation scenario was better than that of the adaptive 4x4 MIMO configuration with 2x2 MIMO achieving 60.41% of coverage area having throughput values between 1 - 40Mbps as against 55.87% achieved by the 4x4 MIMO configuration in the peculiar deployment terrain.

研究动机与目标

• 评估在西非撒哈拉地区复杂地形中新建部署的4G LTE网络性能，尤其聚焦于加纳地区。
• 评估不同MIMO天线配置下吞吐量和覆盖等关键网络参数的表现。
• 比较2x2、4x4和8x8 MIMO配置在真实部署环境下的有效性。

提出的方法

• 使用Genex Unet进行仿真，以模拟2x2、4x4和8x8 MIMO配置下的网络覆盖和吞吐量性能。
• 通过实地测量验证仿真结果，确保在真实环境条件下的准确性。
• LTE部署使用2600 MHz频段，反映该地区实际的频谱分配情况。
• 性能指标包括每扇区的平均吞吐量以及达到目标数据速率（1–40 Mbps）的覆盖区域比例。
• 比较自适应4x4 MIMO与固定2x2 MIMO，以评估容量与覆盖之间的权衡。

实验结果

研究问题

• RQ1 在西非撒哈拉地区部署环境中，4x4 MIMO配置与2x2 MIMO在平均吞吐量方面有何差异？
• RQ2 在真实地形条件下，2x2与4x4 MIMO配置在2600 MHz频段的覆盖可靠性如何？
• RQ3 MIMO配置在多大程度上影响达到目标数据速率（1–40 Mbps）的区域比例？
• RQ4 仿真结果能否准确反映在非洲复杂地形中LTE网络的真实性能？

主要发现

• 4x4 MIMO配置在每扇区的平均仿真吞吐量方面高于2x2 MIMO配置。
• 2x2 MIMO配置提供了更好的覆盖可靠性，有60.41%的覆盖区域吞吐量在1至40 Mbps之间。
• 4x4 MIMO配置在同一吞吐量范围内覆盖比例为55.87%，表明容量与覆盖之间存在权衡。
• 8x8 MIMO配置虽已仿真，但提供的文本中未对吞吐量或覆盖进行定量比较。
• 实地测量结果支持了仿真结果，验证了模型在预测真实世界性能方面的准确性。
• 本研究证实，MIMO配置在复杂西非撒哈拉地形中显著影响吞吐量和覆盖性能。