Abstract
The extension from centimeter wave frequencies to millimeter wave (mmWave) frequencies has triggered an enormous transformation in terms of radio access architecture for future wireless networks, and it has therefore empowered unlimited opportunities for the user-oriented services and applications. Besides mmWave as a driving element, beamforming (BF) will be incorporated as a key enabling technology for the future wireless networks. In this paper, we propose a positioning-aided beamforming (PA-BF) framework for enhanced downlink communications in a cloud-oriented mmWave mobile networks. We show that the proposed PA-BF achieves a higher effective transmit ratio that is equivalent to a lower initial access latency than the conventional codebook-based BF, which in turn manifests its capability to support high-velocity mobile users. We also analyze the impact of positioning accuracies on the performance of PA-BF and discuss the trade-offs between different BF strategies with varied system parameters. Our simulation results demonstrate that, with a narrow beam phased array and reasonably good positioning accuracy, the PA-BF framework is capable of achieving higher spectral efficiency than the considered codebook-based BF especially at higher velocities.
Highlights
Without a doubt, upcoming wireless communication systems will extend the radio channels towards a higher frequency range, namely the millimeter wave band, in order to enable various user-driven services that require ultra-high channel capacity in both uplink (UL) and downlink (DL), such as virtual reality and video conference
In this paper, we proposed and examined a cloud-oriented communication system where the achieved location-awareness via UL positioning was exploited to carry out efficient BF in the DL, which, as a result, enhanced the communication performance in a mmWave mobile networks
In terms of the positioning accuracy, we considered and analyzed the theoretical positioning-error bound (PEB) obtained based on the time difference of flight (TDoF) measurements in the context of multi-connectivity
Summary
Without a doubt, upcoming wireless communication systems will extend the radio channels towards a higher frequency range, namely the millimeter wave (mmWave) band, in order to enable various user-driven services that require ultra-high channel capacity in both uplink (UL) and downlink (DL), such as virtual reality and video conference. In order to overcome the severe propagation losses, the future wireless communication systems incorporate several other features such as the small cell networks (SCNs) and beamforming (BF) as the. Apart from SCNs, the mmWave mobile networks will incorporate the BF functionalities as another enabling technology to overcome the severe path-loss and to better optimize the interference level at both UL and DL. Y. Lu et al.: Positioning-Aided 3D Beamforming for Enhanced Communications in mmWave Mobile Networks. In order to enhance the DL communication quality, we propose a positioning-aided beamforming (PA-BF) framework that exploits the location information of the UE via network-centric UL positioning, leading to a lower IA latency and a higher throughput than utilizing the codebook-based BF strategies [7]. Demonstrating that the proposed PA-BF framework can support much higher UE velocities than the codebook-based BF, while maintaining the same communication quality in terms of the achievable spectral efficiency
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