In order to meet the ever-increasing traffic demands, the combination of fiber and Millimeter Wave (mmWave) is expected to play a key role for 5G Centralized-Radio Access Networks (C-RANs). Due to the inefficiency of the Common Public Radio Interface for the Baseband Unit (BBU)-Remote Radio Head (RRH) communication, analog-Radio-over-Fiber (a-RoF) technology is considered a promising solution, mainly due to the RRH simplification and lower fronthaul requirements it imposes. In such mmWave a-RoF C-RANs, efficient Medium Transparent-Medium Access Control (MT-MAC) protocols are needed able to meet the challenging 5G requirements. To this end, in this paper, we propose a gated service MT-MAC protocol which authorizes each user to transmit the amount of data it requested. A detailed delay model is proposed, which is validated through simulations for different fiber lengths, network load conditions and number of available optical wavelengths. Moreover, the proposed protocol is compared with the state-of-the-art (SoA) and is shown to achieve up to 20 times higher throughput, 2 times lower delay with 100% lower blocking probability and 5 times higher data wavelength utilization, while being able to adapt to varying network traffic conditions. Our proposal also attains sub-ms latency in most cases, constituting it a promising candidate for 5G mmWave a-RoF C-RANs.

中文翻译：

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用于Sub-M延迟5G光纤mmWave C-RAN的门控服务MAC协议

为了满足不断增长的流量需求，光纤和毫米波（mmWave）的组合有望在5G集中式无线电接入网络（C-RAN）中发挥关键作用。由于基带单元（BBU）-远程无线电头端（RRH）通信的公用公共无线电接口效率低下，因此，由于RRH，光纤模拟无线射频（a-RoF）技术被认为是一种有前途的解决方案简化并降低了对前传的要求。在这样的mmWave a-RoF C-RAN中，需要有效的中等透明介质访问控制（MT-MAC）协议，才能满足具有挑战性的5G要求。为此，在本文中，我们提出了门控服务MT-MAC协议，该协议授权每个用户发送其请求的数据量。提出了详细的延迟模型，通过针对不同的光纤长度，网络负载条件和可用光波长数量的仿真进行了验证。此外，将拟议的协议与最新技术（SoA）进行了比较，结果表明，该协议的吞吐量提高了20倍，延迟降低了2倍，阻塞概率降低了100％，数据波长利用率提高了5倍，而能够适应变化的网络流量条件。在大多数情况下，我们的建议还可以达到亚毫秒级的延迟，这使其成为5G mmWave a-RoF C-RAN的有希望的候选者。延迟降低2倍，阻塞概率降低100％，数据波长利用率提高5倍，同时能够适应变化的网络流量条件。在大多数情况下，我们的建议还可以达到亚毫秒级的延迟，这使其成为5G mmWave a-RoF C-RAN的有希望的候选者。延迟降低2倍，阻塞概率降低100％，数据波长利用率提高5倍，同时能够适应变化的网络流量条件。在大多数情况下，我们的建议还可以达到亚毫秒级的延迟，这使其成为5G mmWave a-RoF C-RAN的有希望的候选者。