This paper builds the objective function of bandwidth about split, the restricti on condition and the two-level optimized path based on bandwidth model, and de cides optimized object, scope and step length of each step in the first level.

• 在基于带宽模型下建立通过带宽度关于绿信比的目标函数和约束条件及二层优化路径 ,通过计算来确定第 1层每一步优化对象、范围和优化步长。