Coexistence of SRD CSMA-based systems with DC-based systems and LTE

Rita Bandeira, Ivo Sousa, Tiago Rosa Maria Paula Queluz, A. Rodrigues
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引用次数: 1

Abstract

Short Range Devices (SRDs) operate in unlicensed spectrum, and though there are some rules to control the sharing of radio resources, there is no limit to the geographical density of devices. Therefore, efficient radio resource utilization is of paramount importance to guarantee the expected performance, even in high contention situations. It is also necessary to guarantee that the growing number of SRDs operating in the adjacent band of Long Term Evolution (LTE) do not degrade its performance, and vice-versa. In this work, the operation of SRDs in a building automation application scenario is assessed using a Carrier Sense Multiple Access (CSMA) channel access scheme for multiple SRD densities. CSMA is considered both as a standalone access scheme and in coexistence with another random channel access scheme — Duty Cycle (DC). Simulation results have shown that the SRD system underperforms if the transmission power is too low or too high, which means that, in order to obtain the best performance, the transmission power of CSMA nodes needs to be carefully adjusted taking into account the operating area. Moreover, CSMA is proven to successfully operate in the presence of dozens of DC sensors, although at the cost of more energy required for retransmissions. Finally, with respect to the LTE and SRD coexistence scenario, the analysis shows that the LTE User Equipment (UE) emissions may impair the SRD system; on the other hand, the impact of SRD emissions on LTE UEs is insignificant.
基于SRD csma的系统与基于dc的系统和LTE的共存
短距离设备(SRDs)在未经许可的频谱中运行,尽管有一些规则来控制无线电资源的共享,但设备的地理密度没有限制。因此,即使在高争用情况下,有效利用无线电资源对于保证预期性能也至关重要。此外,还需要保证在LTE (Long Term Evolution)相邻频段运行的越来越多的srd不会降低其性能,反之亦然。在这项工作中,使用针对多个SRD密度的载波感知多址(CSMA)信道接入方案评估了楼宇自动化应用场景中SRD的运行情况。CSMA既被认为是一个独立的接入方案,又与另一个随机信道接入方案——占空比(DC)共存。仿真结果表明,发射功率过低或过高都会影响SRD系统的性能,这意味着为了获得最佳性能,需要根据工作区域仔细调整CSMA节点的发射功率。此外,CSMA已被证明可以在数十个直流传感器存在的情况下成功运行,尽管重传需要更多的能量。最后,对于LTE和SRD共存的场景,分析表明LTE用户设备(UE)的发射可能会损害SRD系统;另一方面,SRD排放对LTE ue的影响不显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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