中文摘要：

针对多阶段协作多播无线网络的能效优化问题，基于香农理论，将能量效率最大化问题转化为能量消耗最小化问题，提出综合基站的覆盖率、中继的组合、每个中继传输的用户组合、基站与中继的传输时间的优化方案，通过比较所有组合的目标函数找到最优解。选择2个中继转发数据的简化网络，提出了一种优化方案。仿真结果表明，提出的协作多播调度方案比传统多播方案能量效率更高，对于协作多播调度方案，通过设置合适的基站覆盖率和优化中继组合能使能量效率达到最高。

英文摘要：

Aiming at the energy-efficiency optimization for the multi-stage cooperative multicast wireless networks,based on Shannon theory,the maximization problem of energy-efficiency is transformed to the minimization problem of energy con-sumption.An optimization scheme is proposed which colligates the coverage ratio,the combination of relays,the users sub-set of each relay transmission and the transmission time between BS and relays.The optimal solution can be obtained by comparing the values of obj ective functions of all combinations.Aiming at the simplified network where two relays are se-lected to transmit the data,a simple optimization scheme is proposed.The simulation results show that the proposed coop-erative multicast scheduling scheme can achieve higher energy-efficiency than the conventional multicast scheme,and for co-operative multicast scheduling scheme,it can achieve the highest energy efficiency by selecting the appropriate coverage ratio and optimizing relay combination.