With the characteristics of the underwater acoustic channel , media access control protocols at data link layer adopt the maca protocol which uses rts - cts exchange to solve the hidden and exposed situation and automatically control power 在数据链路层的设计中针对水下声信道的特点，对于介质访问控制协议采用了maca协议，它使用rts - cts控制报文握手机制来解决uan中的隐蔽终端、暴露终端以及功率控制问题。
Fa _ maca is an improvement of the well known maca ( multiple access collision avoidance ) protocol , which not only avoids the " hidden terminal " problem in wireless channel , but also adaptively adjust the access delay based on the traffic flow and traffic priority of the network 将多业务种类的不同接入时延调整策略和传统的maca多址接入协议相结合，提出了应用在adhoc网络中的流量自适应的maca接入协议? fa - maca 。
The concept " equivalent service time " is used to describe our model and then the system can obtain the good performance without loss of any store resources . 2 . a novel mac protocol for ad hoc network ~ fa _ maca ( flow adaptive multiple access with collision avoidance ) is presented 而且，通过对最佳缓存模型的设计，可以在保证系统的qos要求的情况下，提供最合适的发送缓存区大小，有效的降低不必要的资源浪费。
