本文对基于Vo LTE网络下的信任域EPC接入、直连IMS接入和非信任域EPC接入三种Vo Wi Fi接入技术方案进行比较,非信任EPC接入方式是目前运营商Vo Wi Fi接入的最佳方案。对非信任域EPC接入方案中的五项关键接入进行了分析:认证鉴权采用安...本文对基于Vo LTE网络下的信任域EPC接入、直连IMS接入和非信任域EPC接入三种Vo Wi Fi接入技术方案进行比较,非信任EPC接入方式是目前运营商Vo Wi Fi接入的最佳方案。对非信任域EPC接入方案中的五项关键接入进行了分析:认证鉴权采用安全的双向AKA鉴权方式;接入域选技术在非信任域接入中的应用;无缝互切换技术中的VOLTE与WLAN之间的跨域切换流程;Vo Wi Fi计费原则;Vo Wi Fi的Qos服务质量分析。最后展望了Vo Wi Fi技术的演进与发展的方向。展开更多
介绍了引入Vo Wi Fi的背景及相应的三种组网方案。针对应用前景最广泛的基于IMS实现非信任域EPC接入方案的流程以及认证鉴权、接入域选择、WLAN和LTE间的无缝互切换、计费、服务质量等五个关键技术进行了分析,最后结合Vo Wi Fi市场发展...介绍了引入Vo Wi Fi的背景及相应的三种组网方案。针对应用前景最广泛的基于IMS实现非信任域EPC接入方案的流程以及认证鉴权、接入域选择、WLAN和LTE间的无缝互切换、计费、服务质量等五个关键技术进行了分析,最后结合Vo Wi Fi市场发展现状和国内运营商的网络特点提出了部署策略建议。展开更多
In this paper, an ODE-type trust region algorithm for solving a class of nonlinear complementarity problems is proposed. A feature of this algorithm is that only the solution of linear systems of equations is required...In this paper, an ODE-type trust region algorithm for solving a class of nonlinear complementarity problems is proposed. A feature of this algorithm is that only the solution of linear systems of equations is required at each iteration, thus avoiding the need for solving a quadratic subproblem with a trust region bound. Under some conditions, it is proven that this algorithm is globally and locally superlinear convergent. The limited numerical examples show its efficiency.展开更多
This paper proposes a two-piece update of projected reduced Hessian algorithmwith nonmonotonic trust region strategy for solving nonlinear equality constrained optimizationproblems. In order to deal with large problem...This paper proposes a two-piece update of projected reduced Hessian algorithmwith nonmonotonic trust region strategy for solving nonlinear equality constrained optimizationproblems. In order to deal with large problems, a two-piece update of two-side projected reducedHessian is used to replace full Hessian matrix. By adopting the Fletcher's penalty function as themerit function, a nonmonotonic trust region strategy is suggested which does not require the meritfunction to reduce its value in every iteration. The two-piece update of projected reduced Hessianalgorithm which switches to nonmonotonic trust region technique possesses global convergence whilemaintaining a two-step Q-superlinear local convergence rate under some reasonable conditions.Furthermore, one step Q-superlinear local convergence rate can be obtained if at least one of theupdate formulas is updated at each iteration by an alternative update rule. The numerical experimentresults are reported to show the effectiveness of the proposed algorithm.展开更多
文摘本文对基于Vo LTE网络下的信任域EPC接入、直连IMS接入和非信任域EPC接入三种Vo Wi Fi接入技术方案进行比较,非信任EPC接入方式是目前运营商Vo Wi Fi接入的最佳方案。对非信任域EPC接入方案中的五项关键接入进行了分析:认证鉴权采用安全的双向AKA鉴权方式;接入域选技术在非信任域接入中的应用;无缝互切换技术中的VOLTE与WLAN之间的跨域切换流程;Vo Wi Fi计费原则;Vo Wi Fi的Qos服务质量分析。最后展望了Vo Wi Fi技术的演进与发展的方向。
基金Supported by the Natural Science Foundation of Hainan Province(80552)
文摘In this paper, an ODE-type trust region algorithm for solving a class of nonlinear complementarity problems is proposed. A feature of this algorithm is that only the solution of linear systems of equations is required at each iteration, thus avoiding the need for solving a quadratic subproblem with a trust region bound. Under some conditions, it is proven that this algorithm is globally and locally superlinear convergent. The limited numerical examples show its efficiency.
基金The author gratefully acknowledges the partial supports of the National Science Foundation of China Grant (10071050)Science Foundation of Shanghai Technical Sciences Committee Grant (02ZA14070) Science Foundation of Shanghai Education Committee Grant
文摘This paper proposes a two-piece update of projected reduced Hessian algorithmwith nonmonotonic trust region strategy for solving nonlinear equality constrained optimizationproblems. In order to deal with large problems, a two-piece update of two-side projected reducedHessian is used to replace full Hessian matrix. By adopting the Fletcher's penalty function as themerit function, a nonmonotonic trust region strategy is suggested which does not require the meritfunction to reduce its value in every iteration. The two-piece update of projected reduced Hessianalgorithm which switches to nonmonotonic trust region technique possesses global convergence whilemaintaining a two-step Q-superlinear local convergence rate under some reasonable conditions.Furthermore, one step Q-superlinear local convergence rate can be obtained if at least one of theupdate formulas is updated at each iteration by an alternative update rule. The numerical experimentresults are reported to show the effectiveness of the proposed algorithm.
