At the energy crisis today, energy-saving emission reduction and promoting green communication are a major problem for the communication industry to face. While the power and signaling overhead brought by relay station need to consume energy inevitably. 同时,在能源危机的今天,节能减排,倡导绿色通信是当今通信界面临的一个重大问题;而引入中继带来的功率、信令开销等必然需要消耗一定能量。