ID 原文 译文
57638 通过引入集中管理单元，移动终端能快速选择多普勒频移最小的卫星，同时根据传输时延和卫星星历对多普勒频移值进行估计、补偿、更新和再补偿. By introducing a centralized control unit，the user equipment can quickly select the satellite with the smallest Doppler frequency shift， and at the same time，the Doppler shift value is compensated，updated and re-compensated according to the transmission delay and the satellite ephemeris.
57639 仿真结果表明，与传统算法相比，该算法有效降低了多普勒频移，提高了卫星通信链路的质量和接入成功率. Simulations show that，compared with the traditional algorithm，this algorithm effectively reduces the Doppler frequency shift，and improves the quality of sat- ellite communication links and access success rate.
57640 为了缓解回程链路的压力，移动网络运营商( MNO) 在其宏基站( MBS) 覆盖范围内的热点地区上方灵活部署具有缓存能力的无人机( UAVs) 作为空中基站. To alleviate the load of the backhaul link，a mobile network operator ( MNO) temporarily de- ploys cache-enabled unmanned aerial vehicles( UAVs) as aerial base stations to offload the traffic from a macro base station ( MBS) .
57641 此外，多个内容提供商( CPs) 渴望租用 MBS 和 UAVs 的缓存空间以主动缓存其流行视频，从而降低订阅用户的服务时延. While several content providers ( CPs) desire to rent the cache space at both the MBS and UAVs to proactively place their popular videos so that their subscribers can receive low-la- tency services.
57642 但每个 CP 租赁缓存空间的意愿程度是私有的，这导致 MNO 和 CPs 间的信息不对称.为了解决此问题，提出了基于合同理论的缓存资源租赁机制以最大化 MNO 的效用. However，the willingness for cache renting is privately for each ( CP) ，resulting in asym- metric information between the MNO and CPs. To overcome this problem，the contract theory is exploited to formulate the cache renting problem and to maximize the utility of MNO.
57643 理论上推导出了合同的可行条件，继而将目标优化问题放松为凸规划问题，采用 KKT 条件求得缓存租赁的最优合同. The feasible conditions for the contract are derived，and the target optimization problem is relaxed to the convex programming problem. Finally，the KKT condition is utilized to solve the optimal contract for the cache renting.
57644 仿真结果验证了所提出的无人机辅助第 5 代移动通信系统( 5G) 网络缓存租用机制的有效性，并讨论了 UAVs 的飞行高度对系统性能的影响. Experiments validate the effectiveness of the proposed cache renting mechanism in UAV-assisted the 5th generation of mobile communications system( 5G) networks，and the influence of UAVs’flight altitude on system per- formance is discussed.
57645 针对稀疏移动网络中能量高效的数据传输问题，提出一种满足时延软约束的路由算法. In order to achieve the energy-efficient data transmission in sparse mobile wireless networks，a routing algorithm with delay soft-constraint is proposed.
57646 将多个时隙的静态网络拓扑建模为虚拟的空时图模型.该空时图模型既包含网络拓扑在每一时隙的连通信息，也包含由移动性引起的链路变化信息. A sequence of network topologies in a number of time-slots is modeled as a virtual spatial-temporal graph，which includes both the connectivity information in each time-slot and the link change information due to mobility.
57647 重新定义端到端的路由问题为寻找一条低能耗空时路径，并满足时延软约束. A new routing problem in the spatial- temporal graph is defined to find an energy-efficient spatial-temporal path under a given delay soft-con- straint.