基于双连接和回传带宽配置的系统吞吐量效用和最大化算法

Algorithm for Maximizing Sum of System Throughput Utility Based on Dual Connectivity and Backhaul Bandwidth Allocation

针对双连接可行的异构无线网络中关于用户关联和回传带宽配置的联合优化问题,构建了一个新的网络吞吐量效用和最大化框架。将该联合优化问题建模为一个非凸的混合整数分式优化问题。为了便于求解,首先将原建模问题进行去分式化转换,然后针对转换后依旧非凸的混合整数非线性优化问题,将其分解为两个优化子问题分别求解。通过固定用户关联变量,得到了最优的回传带宽配置机制;通过固定回传带宽配置因子变量,提出一个有效的迭代算法求解双连接可行的用户关联子问题。相比固定的回传带宽配置机制,所提算法可以获得最优的回传单位带宽配置因子值,同时拥有最优的系统吞吐量和系统吞吐量效用和性能。

For the joint optimization problem of user association and return bandwidth configuration in dual connected heterogeneous wireless networks,a new network throughput utility and maximization framework is constructed.The joint optimization problem is modeled as a nonconvex mixed integer fractional optimization problem.In order to facilitate the solution,the original modeling problem is transformed into a fractional form,and then for the transformed mixed integer nonlinear optimization problem which is still nonconvex,it is decomposed into two optimization subproblems to be solved respectively.By fixing the user correlation variable,the optimal return bandwidth allocation mechanism is obtained.By fixing the return bandwidth allocation factor variable,an effective iterative algorithm is proposed to solve the dual connection feasible user association subproblem.Compared with the fixed return bandwidth allocation mechanism,the proposed algorithm can obtain the optimal return unit bandwidth allocation factor,and has the optimal system throughput,system throughput utility and performance.