传感器网络拓扑控制-ASCENT算法

Sensor network topology control-ASCENT algorithm

ASCENT算法[1]的前提是节点密度足够大,有一个CSMA,MAC协议或TDMA,MAC协议支持。ASCENT算法与STEM算法都属于节点唤醒机制,它们之间也存在着比较大的差别。ASCENT算法偏重于均衡网络中骨干节点的数量,保障数据通路的顺畅。当一个节点接收到数据时,如果存在严重的丢包率,则向该数据源的方向向该相邻节点发送帮助消息;从该相邻节点接收到帮助请求或从该相邻节点检测到丢包率高时,该节点唤醒,它会主动成为一个活动节点来帮助该相邻节点转发数据包。

The premise of the ASCENT algorithm [1] is that the node density is large enough to have a CSMA, MAC protocol or TDMA, MAC protocol support. Both the ASCENT algorithm and the STEM algorithm belong to the node wake-up mechanism, and there are also large differences between them. The ASCENT algorithm focuses on balancing the number of backbone nodes in the network to ensure smooth data paths. When a node receives data, if there is a serious packet loss rate, a help message is sent to the neighboring node in the direction of the data source;a help request is received from the neighboring node or is detected from the neighboring node. When the packet rate is high, the node wakes up and it actively becomes an active node to help the neighbor node forward the packet.