Abstract: This article contains a survey of the power control technique for energy-saving and the multi-rate feature in MANETs, with particular emphasis on typical MAC protocols with combined techniques of power-control and multi-rate capabilities. Their characteristics, performance and deficiency are compared adequately in terms of optimization goal selection, process method and information exchange. The difficulties in designing MAC protocols taking in account both power-control and multi-rate capabilities including the status of wireless nodes is hard to be fully explored by other nodes and the control metrics can't accurately achieve the optimization goal. Finally, future trends are predicted.

Key words: power control, rate adaption, Medium Access Control(MAC), integrated optimization

摘要： 本文首先分析了自组网中以节能为目的的功率控制以及多速率技术；然后详细介绍了当前典型的结合这两种技术进行综合优化的MAC协议，从优化目标选择、工作方式、信息来源等方面对比分析了这些协议的特点、性能及缺陷；指出该类的MAC协议的研究难点在于，对其他节点的状态了解不充分和度量指标难于反映综合优化目标。最后提出可能的改进方向。

关键词: 功率控制, 速率自适应, 媒体访问控制, 综合优化