CAJ | 학술논문

针对现有的任播通信(anycast)模型无法在具有可扩展性的同时提供QoS支持,提出了一种分段测量的任播通信模型(SMA).通过任播通信组成员之间的竞争将最优成员的单播地址存储到相应路由器,由此解决了路由表膨胀问题.同时,提出了一种由分段延迟变化估计总体延迟变化上界的方法,通过组成员和路由器之间的小范围网络参数的测量、分享和估计,支持带QoS约束的任播通信请求.PlanetLab上的实验表明,所提方法的准确性较高.模拟真实Internet结构的网络拓扑仿真证明,SMA不但具有较高的最优组成员发现效率,而且还具有良好的可扩展性和可实现性.
침대현유적임파통신(anycast)모형무법재구유가확전성적동시제공QoS지지,제출료일충분단측량적임파통신모형(SMA).통과임파통신조성원지간적경쟁장최우성원적단파지지존저도상응로유기,유차해결료로유표팽창문제.동시,제출료일충유분단연지변화고계총체연지변화상계적방법,통과조성원화로유기지간적소범위망락삼수적측량、분향화고계,지지대QoS약속적임파통신청구.PlanetLab상적실험표명,소제방법적준학성교고.모의진실Internet결구적망락탁복방진증명,SMA불단구유교고적최우조성원발현효솔,이차환구유량호적가확전성화가실현성.
Since the existing anycast communication models can not achieve scalability and provide QoS guarantee simultaneously, an anycast communication model-SMA is proposed based on seg-mental measurement. The routing table is restricted by the competition among anycast group members, and only one winner can write its unicast address to the related routers. A method to estimate the variation upper bound of end-to-end delay is proposed. The anycast requests with QoS constraint are supported by measuring, sharing and estimating network parameters between routers and anycast members in a small region. Experiments on PlanetLab show that the pro-posed estimation method is accurate. Simulations in a nearly real Internet topology show that the SMA is efficient in the selection of best members and has good scalability and reliability as well.