无线协作网络中一种高效的分布式安全中继选择方法

Cloud computing is always adopted to enhance the computing capability of mobile systems , especially when the mobile users prefer to use some computation intensive applications . Consequently, the distributed wireless relay infrastructure should be deployed to aid the traffic transmission. To further enhance the QoS provisioning goals of wireless cooperative network, this paper puts forward a multiobjective approach for distributed optimal relay selection, which takes Bit Error Rate (BER) and Secrecy Capacity (SC) into account simultaneously. Firstly, our proposal partitions the channel state into several levels according to the received signaltonoise ratio (SNR) and describes the timevarying Rayleigh fading channel characteristics by using first order finitestate Markov model. Secondly, we model the relay selection as Restless Multiarmed Bandit optimal solution problem with respect to the channel state and the state transition probability. Finally, simulation results demonstrate the efficiency of the proposed approach which outperforms the existing ones .     

基于TCP的移动网络时延优化研究与实践

针对网络时延问题,深入研究在线视频、实时对战游戏等应用的业务特征,聚焦传输层信令特征,基于TCP,研究移动网络时延优化关键技术,突破常规TCP信令交互思路,研究并应用TCP ACK分裂、Quick ACK及智能预调度等技术,优化交互流程与空中接口调度机制,有效缩短网络时延,提升用户感知。实践证明此方法可行、有效,具备较大的推广价值。     

无线协作网络中具有QoS保障的 能量高效的干扰源选择方法

Aiming at achieving better Quality of Service (QoS) provisioning in distributed wireless cooperative networks, a novel energy efficient jammer selection approach is proposed in this paper. We employ Secrecy Capacity (SC) to characterize the security of transmission. In order to accurately describe the time-varying characteristic, related channels are modeled as Finite-State Markov Channels (FSMCs). The remaining energy of candidate node is considered in a similar way. Accordingly, jammer selection is modeled as Restless Multi-armed Bandit problem for the sake of energy balance and security. Primal-dual heuristic and priority-index heuristic are exploited to select the optimal jammer quickly and effectively. In the simulation, numerical evaluation of SC and networks lifetime results show that the proposed approach outperforms the existing ones.     

基于LTE的低成本网络扩容技术研究

详细介绍三种低成本的网络扩容技术,在多个场景开展试点验证,结合用户体验、网络质量、容量提升效果等多方面因素,展开优缺点分析。结果表明,所提的新技术方案,能快速、有效地解决当前紧急的网络容量问题。