全双工D2D通信无线资源优化分配研究

With device-to-device (D2D) communications, proximity users in a cellular network can communicate directly to each other without going through the base station (BS). Due to the physical proximity, it can bring proximity gain, reusing gain and hop gain, and thus can potentially increase system spectral-efficiency (SE) and energy-efficiency (EE). Therefore，D2D communications have being considered as one of the key techniques in future cellular networks. Full-duplex D2D communications, which enable the transceiver to simultaneously transmit and receive in the same band, can further improve the system performance. However, full-duplex D2D communications may generate harmful interference into the existing cellular network if not designed properly. Users may suffer not only the inter-user interference but also the self-interference. Therefore, interference management is one of the most challenging and important issues for full-duplex D2D communications to coexist with the existing BS relaying based cellular communications and harvest the potential benefits. In this project, we mainly focus on interference management and resource optimization issues in the full-duplex D2D communications. Specifically, we first propose a cross-layer optimization framework that jointly considers the admission control, mode selection and resource allocation. Then, we design a novel win-win spectrum-energy trading strategy to encourage the cooperation between the full-duplex D2D users and traditional cellular users. Last, we investigate the tradeoff and optimization between the system SE and EE in the full-duplex D2D networks to effectively improve the overall SE and EE performance. The achievements of this project can provide necessary theoretical and technical supports for developing efficient resource management strategies in the next generation cellular networks.

D2D通信由于直通链路距离短，可以带来信道增益、复用增益和跳数增益, 有助于提高蜂窝网络的频谱效率和能量效率，被广泛认为是下一代蜂窝网络的关键技术之一。基于同时同频收发的全双工通信可以进一步提升D2D通信的性能，但也给现有网络带来了更加复杂的用户间干扰和自干扰，而高效的资源管理是解决用户干扰并保证服务质量的关键。因此，本项目拟从资源优化的角度解决全双工D2D通信和蜂窝通信共存所带来的干扰问题并实现其提升系统整体性能的好处。首先研究D2D混合双工通信模式下的跨层优化资源分配方案，以减少设计冗余；其次提出基于频谱能量交易的D2D全双工中继激励机制，以实现D2D用户和蜂窝用户的合作共赢；最后设计全双工D2D通信中谱效与能效的折中优化机制，以达到在满足用户服务需求的条件下尽可能地提升系统谱效和能效。本项目研究成果可为研发下一代蜂窝网络的资源分配管理机制提供理论基础和有效的技术手段。

D2D通信技术利用通信双方距离近的优势，可以给用户提供高速率、低时延、低功耗的近距离本地化通信服务，而且有着广泛的应用并吻合未来无线通信的发展需求，因此，被广泛认为是移动通信系统中的关键技术之一。而5G 异构无线网络是一种重要的网络技术支撑。随着无线通信技术的繁荣，无线网络的异构已经不仅体现在传统的多层小区覆盖，还表现在传统无线蜂窝网络与 D2D 直通技术、移动边缘计算、无线充电技术、物理层安全、车联网等有机融合。而且在异构无线网络中，多种形式的信号传输需要常常需要共享一定的系统频谱资源，因此如何通过网络资源分配最大化通信网络的性能如频谱效率，能源效率，系统吞吐量等是无线网络研究中的核心问题。基于上述背景，本项主要研究了：基于 D2D 的通信网络资源分配与优化，基于车联网的能效和通信切换机制、LTE-U系统的资源分配与优化研究，基于IMU-UWB智能多传感器信息融合的高精度室内定位算法研究等。上述内容的研究，可以提供解决异构通信系统中无线资源优化分配关键问题的理论基础，对于探索和建设下一代无线通信网络具有一定的启发和支撑作用。