该文研究了IMS(IP Multimedia Subsystem)中的呼叫建立流程,以确定可以优化的信令流量,研究结果显示:S-CSCF(Serving Call Session Control Function)是IMS中的瓶颈点。为了降低会话建立时延,提高系统性能,提出了一种基于组的业务触发算...该文研究了IMS(IP Multimedia Subsystem)中的呼叫建立流程,以确定可以优化的信令流量,研究结果显示:S-CSCF(Serving Call Session Control Function)是IMS中的瓶颈点。为了降低会话建立时延,提高系统性能,提出了一种基于组的业务触发算法(Group based Service Triggering Algorithm,GSTA),然后对现有3GPP(3rd Generation Partnership Project)提出的业务触发算法(3GPP STA,3GPP Service Triggering Algorithm)和GSTA进行了性能建模,理论分析和仿真结果表明GSTA可以有效地降低S-CSCF的信令流量,增加了整个系统的吞吐量,同时显著减少了会话建立时延,提高了IMS网络的服务质量。展开更多
针对微电网下电力系统通信易受到拒绝服务攻击(denial of service attack,DoS)、局部信息不开放以及通信带宽受限等问题,提出了一种基于DoS攻击的分布式事件触发的无模型预测补偿能量优化管理控制方法。首先,为了优化微电网能量供给并...针对微电网下电力系统通信易受到拒绝服务攻击(denial of service attack,DoS)、局部信息不开放以及通信带宽受限等问题,提出了一种基于DoS攻击的分布式事件触发的无模型预测补偿能量优化管理控制方法。首先,为了优化微电网能量供给并使得获利最大,给出考虑微电网功率损失的维持供需平衡的最小成本函数;其次,将微电网中的每个部分看作一个智能体并考虑了通信带宽受限问题,提出了一种分布式事件触发一致性算法;随后,提出一种基于输入输出数据的无模型预测控制算法,利用跟踪攻击前时刻的供需不匹配功率来预测补偿当前时刻及其后多个时刻的智能体功率数据缺失;最后,通过仿真实例验证所提出的基于分布式事件触发一致性预测补偿的微电网能量管理方法的有效性。展开更多
To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS...To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS and the existing 3GPP service triggering algorithm （STA） based on initial filter eriteria （iFC） increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performanee, a SIP response message based filter criteria （rFC） was proposed. Based on the rFC, a SIP response message based STA （RSTA） was further proposed. The modeling and theoretical analysis of 3GPP STA and RSTA were presented. Simulation results show that, compared with 3GPP STA, the RSTA can avoid the additional signaling traffie load of the S-CSCF and application server （AS） effectively, reduce the session setup delay eonsiderably, increase the throughput of the S-CSCF and improve the quality of service （QoS） of IMS network.展开更多
文摘该文研究了IMS(IP Multimedia Subsystem)中的呼叫建立流程,以确定可以优化的信令流量,研究结果显示:S-CSCF(Serving Call Session Control Function)是IMS中的瓶颈点。为了降低会话建立时延,提高系统性能,提出了一种基于组的业务触发算法(Group based Service Triggering Algorithm,GSTA),然后对现有3GPP(3rd Generation Partnership Project)提出的业务触发算法(3GPP STA,3GPP Service Triggering Algorithm)和GSTA进行了性能建模,理论分析和仿真结果表明GSTA可以有效地降低S-CSCF的信令流量,增加了整个系统的吞吐量,同时显著减少了会话建立时延,提高了IMS网络的服务质量。
文摘针对微电网下电力系统通信易受到拒绝服务攻击(denial of service attack,DoS)、局部信息不开放以及通信带宽受限等问题,提出了一种基于DoS攻击的分布式事件触发的无模型预测补偿能量优化管理控制方法。首先,为了优化微电网能量供给并使得获利最大,给出考虑微电网功率损失的维持供需平衡的最小成本函数;其次,将微电网中的每个部分看作一个智能体并考虑了通信带宽受限问题,提出了一种分布式事件触发一致性算法;随后,提出一种基于输入输出数据的无模型预测控制算法,利用跟踪攻击前时刻的供需不匹配功率来预测补偿当前时刻及其后多个时刻的智能体功率数据缺失;最后,通过仿真实例验证所提出的基于分布式事件触发一致性预测补偿的微电网能量管理方法的有效性。
基金Supported by National Science Fund for Distinguished Young Scholars (No. 60525110)National Basic Research Program of China (No.2007CB307100, 2007CB307103)+1 种基金Program for New Century Excellent Talents in University (No. NCET-04-0111 )Development Fund Project for Electronic and Information Industry (Mobile Service and Application System Based on 3G)
文摘To reduce the potential signaling traffic in IP multimedia subsystem （IMS）, the session establishment procedures were investigated. The serving call session eontrol function （S-CSCF） is the major bottleneck in IMS and the existing 3GPP service triggering algorithm （STA） based on initial filter eriteria （iFC） increases the end-to-end session setup delay remarkably. To reduce the session setup delay and improve the system performanee, a SIP response message based filter criteria （rFC） was proposed. Based on the rFC, a SIP response message based STA （RSTA） was further proposed. The modeling and theoretical analysis of 3GPP STA and RSTA were presented. Simulation results show that, compared with 3GPP STA, the RSTA can avoid the additional signaling traffie load of the S-CSCF and application server （AS） effectively, reduce the session setup delay eonsiderably, increase the throughput of the S-CSCF and improve the quality of service （QoS） of IMS network.
