论文标题
毫米波城市蜂窝网络中的多用户配置
Multi-User Provisioning in Millimeter-Wave Urban Cellular Networks
论文作者
论文摘要
在本文中，我们介绍了使用特定于位点特定的射线追踪传播数据和现实的天线阵列模式的毫米波（MM-WAVE）城市细胞网络的多用户容量的首次全面研究。我们比较了TDMA和SDMA（分别为时间和空间分裂多访问）的性能在不同的网络方案和天线配置中。我们提出了一种贪婪的启发式算法来解决网络范围的方向链路分配问题，从而估算了多用户MM波网络的可实现能力和覆盖范围。我们的研究结果表明，间元间干扰可以忽略不计，因此TDMA性能严格受到空中时间共享的限制。相比之下，SDMA的主要限制因素是细胞内干扰，强调了真实天线阵列的影响。尽管如此，使用8x8阵列，SDMA在平均UE吞吐量方面显着优于TDMA，最多2 Gbps。作为一个重要的设计见解，我们的结果表明，较大的基站天线阵列限制了细胞内干扰，同时补偿了小型UE阵列，从而降低了实用SDMA网络中的成本和波束成绩。我们的分析还表明，实用的混合束形构建中的天线子阵列数量有限，可能会迫使SDMA降低UES的覆盖范围良好，从而突出了基站致密化和天线资源之间的权衡。
In this paper we present the first comprehensive study of the multi-user capacity of millimeter-wave (mm-wave) urban cellular networks, using site-specific ray-tracing propagation data and realistic antenna array patterns. We compare the performance of TDMA and SDMA (time and spatial division multiple access, respectively) for diverse network scenarios and antenna configurations. We propose a greedy heuristic algorithm to solve the network-wide directional link allocation problem, thereby estimating the achievable capacity and coverage of multi-user mm-wave networks. Our results show that inter-cell interference is negligible, so that TDMA performance is strictly limited by air-time sharing. By contrast, the major limiting factor for SDMA is intra-cell interference, emphasizing the impact of real antenna array sidelobes. Nonetheless, SDMA significantly outperforms TDMA in terms of average UE throughput, by up to 2 Gbps using 8x8 arrays. As an important design insight, our results show that larger base station antenna arrays limit intra-cell interference while compensating for small UE arrays, reducing costs and beamforming requirements in practical SDMA networks. Our analysis also shows that the limited number of antenna sub-arrays in a practical hybrid beamforming architecture may force SDMA to drop UEs with good coverage, highlighting a tradeoff between base station densification and antenna resources.
