arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.07438cs.ITcs.NIcs.SYeess.SYmath.ITmath.PRstat.AP
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大规模LoRa网络的分析与优化:吞吐量公平性与Scalability

Analysis and Optimization for Large-Scale LoRa Networks: Throughput Fairness and Scalability

Jiangbin Lyu, Dan Yu, Liqun Fu

摘要:

LoRa网络是枢转地使能到广域中的低成本和功率受限的用户设备(UE)的长距离连接,而关键问题是有效地分配无线资源以支持潜在的大规模UE,同时解决突出的远近公平性问题,这是具有挑战性的,由于缺乏易处理的分析模型以及对低复杂度和低开销设计的实际要求。利用随机几何,特别是泊松雨模型,我们推导出(半)封闭形式的公式的聚合干扰分布,分组成功概率,因此在单小区和多小区设置与频率复用的系统吞吐量,通过考虑信道衰落,随机UE分布,部分分组重叠,和/或多网关分组接收。分析公式只需要平均信道统计和空间UE分布,这使得易于处理的网络性能评估和孵化我们提出的迭代平衡(IB)方法,快速产生联合扩频因子(SF)分配,功率控制和占空比调整的高级策略,用于测量平均最大-最小UE吞吐量或支持的UE密度与速率要求。数值结果验证了分析公式和我们提出的优化方案的有效性,这大大简化了远近公平性问题,降低了空间功耗,同时显着提高小区边缘吞吐量以及空间(总和)吞吐量为大多数UE,通过适应UE/网关密度。

英文摘要:

LoRa networks are pivotally enabling Long Range connectivity to low-cost and power-constrained user equipments (UEs) in a wide area, whereas a critical issue is to effectively allocate wireless resources to support potentially massive UEs while resolving the prominent near-far fairness issue, which is challenging due to the lack of tractable analytical model and the practical requirement for low-complexity and low-overhead design. Leveraging on stochastic geometry, especially the Poisson rain model, we derive (semi-) closed-form formulas for the aggregate interference distribution, packet success probability and hence system throughput in both single-cell and multi-cell setups with frequency reuse, by accounting for channel fading, random UE distribution, partial packet overlapping, and/or multi-gateway packet reception. The analytical formulas require only average channel statistics and spatial UE distribution, which enable tractable network performance evaluation and incubate our proposed Iterative Balancing (IB) method that quickly yields high-level policies of joint spreading factor (SF) allocation, power control, and duty cycle adjustment for gauging the average max-min UE throughput or supported UE density with rate requirements. Numerical results validate the analytical formulas and the effectiveness of our proposed optimization scheme, which greatly alleviates the near-far fairness issue and reduces the spatial power consumption, while significantly improving the cell-edge throughput as well as the spatial (sum) throughput for the majority of UEs, by adapting to the UE/gateway densities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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