基于异构协同的空天网络无线资源管理技术研究

As an important infrastructure in our country, the air & space information network gradually becomes research hotspot. There are two main characteristics of our existing network, the distribution of nodes is non-uniform and sparse and the exchange of information is flattening. In the present study many factors such as multi-system heterogeneous network architecture and cross-layer delay have not been considered yet. Lead to the weak ability of information sharing and the unbalanced utilization of nodes. Aiming at above-mentioned features, primary study of radio resource management technology are mainly focus on how to improve the ability of information sharing and utilization of nodes. Our team focuses on multiple access, handover and transmission, puts forward the heterogeneous cooperative air & space network model. Using the characteristics of multi-system cross-layer heterogeneous, we propose asymmetric multiple access scheme to solve the unbalanced utilization problem of link resource. According to the high dynamic feature of network node and terminal, we propose our handover scheme which is based on the function separation of access point and connectivity of network topology to solve the problem of frequent handover caused by unmatched access. Considering the different time delay of nodes, we propose layered HARQ cooperative transmission scheme to solve long time delay problem caused by repeated retransmission. Preliminary results show that our scheme has high feasibility and can provide theoretical reference and data support for further improvement and optimization of the ability of information sharing and utilization of nodes.

空天信息网络作为我国重要的基础设施，逐渐成为研究热点。我国现有空天网络具有节点非均匀稀疏分布、信息交互扁平化等特点。目前研究中尚未考虑该网络多系统异构、跨层时延差等因素，导致节点信息共享能力较弱、节点利用率不均衡。无线资源管理技术针对上述特点，对如何提升节点信息共享能力、利用率等问题进行研究。项目组重点关注多址接入、切换、传输三个关键问题，提出基于异构协同的空天网络模型。利用多系统跨层异构的特点提出“非对称多址接入方案”，解决链路资源利用率不均衡问题；考虑网络节点以及终端高动态的特点，提出“基于接入点功能分离与网络拓扑连通度的切换方案”，解决终端跨层切换时不匹配接入导致的频繁切换问题；考虑节点时延差异化特点，提出“分层HARQ协作传输方案”，解决多次重传导致的长时延问题。初步研究成果表明本方案有较高可行性，可为提升空天网络信息共享能力、节点利用率以及系统资源优化，提供理论参考与数据支持。

空天信息网络作为我国重要的基础设施，逐渐成为研究热点。我国现有空天网络具有节点非均匀稀疏分布、信息交互扁平化等特点。目前研究中尚未考虑该网络多系统异构、跨层时延差等因素，导致节点信息共享能力较弱、节点利用率不均衡。无线资源管理技术针对上述特点，对如何提升节点信息共享能力、利用率等问题进行研究。项目组重点关注多址接入、切换、传输三个关键问题，建立了适用于单节点、同构多节点网络及异构多节点网络的资源管理方案，提升了空天异构网络中资源利用率与系统性能。针对单节点资源受限网络下，提出适用于空天网络的多载波传输方案及配套算法，并建立基于人工智能框架的动态资源分配算法，以提升资源利用率；针对多节点同构网络，提出适用于大连接的异步协同接入方案及分布式星上缓存协同分配方案，提升用户接入成功率并降低内容获取时延；针对多节点异构网络，提出混合GEO/LEO负载均衡方案及星地融合网络下频谱共用与干扰管理方案。最后，项目组建立用于评估空天网络无线资源管理算法的仿真平台。研究成果表明所提方案可有效提升空天网络信息共享能力、资源利用率以及系统整体性能。