系留无人机平台搭载的蜂窝通信基站吞吐量优化

罗祎喆; 丁文锐; 雷耀麟; 刘春辉

doi:10.13700/j.bh.1001-5965.2020.0136

系留无人机平台搭载的蜂窝通信基站吞吐量优化

doi: 10.13700/j.bh.1001-5965.2020.0136

1.
北京航空航天大学电子信息工程学院, 北京 100083
2.
北京航空航天大学无人系统研究院, 北京 100083
3.
中国电子科技集团公司第五十四研究所, 石家庄 050081

基金项目:

国防科技工业发展规划 JCKY2017601C006

国家重点研发计划 2016YFB0502602

详细信息

通讯作者:
丁文锐, E-mail: ding@buaa.edu.cn

中图分类号: V279⁺.2;TB553
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- 文章访问数: 815
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-10
- 录用日期: 2020-07-03
- 网络出版日期: 2021-06-20

Throughput optimization for cellular communication on tethered unmanned aerial vehicle base station

1.
School of Electronics and Information Engineering, Beihang University, Beijing 100083, China
2.
Institute of Unmanned System, Beihang University, Beijing 100083, China
3.
China Electronics Technology Group Corporation 54th Research Institute, Shijiazhuang 050081, China

Funds:

Defense Industrial Technology Development Program JCKY2017601C006

ional Key R · D Program of China 2016YFB0502602

More Information

Corresponding author: DING Wenrui, E-mail: ding@buaa.edu.cn

摘要

摘要:
考虑多架系留无人机（UAV）空中基站为多小区提供空地双向通信服务时，针对地面用户数目分布不均匀和多机协同服务同频干扰严重的问题，提出了一种联合优化空中基站高度和链路传输方向的吞吐量优化算法。该方法通过使用最大同频链路准则和就近服务准则确定了同频链路配对和无人机/用户配对，通过优化空中基站高度和链路传输方向提升了系统平均吞吐量，并减少了用户间的同频干扰。多种场景下验证结果均显示，所提方法显著优于其他非联合优化的对比方法，当拥塞小区用户数目是非拥塞小区用户数目的1~36倍时，相比于不联合优化链路传输方向和空中基站高度的对比方法，所提方法可提升系统平均吞吐量8倍左右。
- 空中基站 /
- 系留无人机(UAV) /
- 空地双向通信 /
- 优化方法 /
- 链路传输方向
Abstract:
Considering the problems of uneven distribution of the number of ground users and serious co-channel interference of multi Unmanned Aerial Vehicle (UAV) cooperative services when multiple tethered UAV aerial base stations are used to provide air-ground two-way communication services to multiple communities, this paper proposes a throughput optimization method with both aerial base station height and link transmission direction optimized. This method determines the co-frequency link pairing and drone/user pairing by using the maximum co-frequency link criterion and the nearest service criterion. By optimizing the drone height and link transmission direction, the average throughput of the system is improved and the co-frequency interference between users is reduced. The verification results in various scenarios show that the proposed method is significantly better than non-joint-optimization comparative methods that do not jointly optimize the link transmission direction and the height of aerial base station. When the number of users in a congested community is 1-36 times the number of users in a non-congested community, compared with the comparative methods, the proposed method can improve the average throughput of the system by about 8 times.
- aerial base station /
- tethered Unmanned Aerial Vehicle (UAV) /
- air-ground two-way communication /
- optimization methodology /
- link transmission direction

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图 1 小区地面用户分布不均衡场景的空地通信

Figure 1. Air-ground communication in the scenario of uneven distribution of ground users in community

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图 2 小区地面用户分布均衡场景的空地通信

Figure 2. Air-ground communication in the scenario of average distribution of ground users in community

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图 3 同频链路服务

Figure 3. Co-channel service

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图 4 单独链路服务

Figure 4. Individual channel service

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图 5 吞吐量优化方法仿真验证场景

Figure 5. Simulation and verification scenario for throughput optimization method

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图 6 使用所提吞吐量优化方法的第1次服务

Figure 6. First service using proposed throughput optimization method

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图 7 使用所提吞吐量优化方法的第2次服务

Figure 7. Second service using proposed throughput optimization method

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图 8 不同拥塞小区用户数目下系统平均吞吐量比较

Figure 8. Comparison of system average throughput under different ground user numbers of congested communities

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图 9 不同空中基站最低高度情况下系统平均吞吐量比较

Figure 9. Comparison of average throughput at different UAV minimum altitudes

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图 10 不同非直视链路阴影衰落均值情况下系统平均吞吐量比较

Figure 10. Comparison of average throughput under different non-direct-looking shadow fading averages

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表 1 多机场景吞吐量优化方法验证的参数设置

Table 1. Parameter setting for throughput optimization method verification in multi-UAV scenarios

参数	取值
地面用户最大发射功率P_gmax/(dB·m)	20
空中基站最大发射功率P_umax/(dB·m)	30
定向天线半波数宽度Φ_B	π/3
单位天线增益g₀	2.286 4 ^[18]
载频f_c/GHz	2
路损指数n	2.5
空中基站最大高度H_max/m	400
空中基站最小高度H_min/m	50
空地信道参数α	0.6^[15]
空地信道参数γ	0.11^[15]
噪声功率σ_NLoS²/(dB·m)	-120
噪声功率σ_LoS²/(dB·m)	-120
直视链路阴影衰落均值ψ_LoS/dB	2^[15-16]
非直视链路阴影衰落均值ψ_NLoS/dB	20^[15-16]

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表 2 不同方法的吞吐量比较

Table 2. Throughput comparison of different methods

拥塞小区用户数	本文方法	对比方法	吐吞量提升/倍
1	49.5	6	8.25
6	21.9	2.7	8.1
11	16.15	1.8	9.0
16	12.15	1.4	8.7
21	9.8	1.1	8.9
26	8.5	0.9	9.4
31	7.6	0.9	8.4
36	7.1	0.8	8.9

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