软件定义网络中的快速移动性管理
Fast mobility solutions in software-defined networks

软件定义网络(SDN)是未来互联网研究领域中的重要课题。该文首先测量和分析SDN中现有的移动性管理方案所面临的问题, 包括用户移动过程中数据包时延大和网络控制开销大等; 并以减少时延和降低控制开销为目标, 设计一种快速移动性管理方案, 该方案采用隧道和流表转发相结合的方式来实现移动性管理, 减少数据平面与控制平面的交互。模拟实验表明: 与SDN中现有的移动性管理方案相比, 快速移动性管理方案使得终端移动过程中的数据包往返时延减少了10倍左右, SDN为移动用户而产生的控制开销降低了一半以上。
Abstract：Software-defined networks (SDN) will be important in the future Internet. Measurements and analyses show the current SDN mobility management problems including long packet delays during handoff and considerable control overhead for supporting the mobility. The packet delay and control overhead are reduced by a fast mobility management scheme which uses tunnel and flow tables to decrease the communication between the control plane and the data plane. Simulations show that the fast IP mobility management scheme reduces the packet delay ten folds compared with the current SDN mobility management scheme with the control overhead during user handoff reduced by more than half.