Abstract: The wireless sensor network is event triggering network, which contains many nodes. The concepts of same source collision and different source collision were put forward. The collision caused by identical event triggering several nodes movement was regarded as same source collision and the collision caused by different events triggering different nodes movement was regarded as different source collision. All these two collisions can cause the decline of network data stream and the waste of nodes energy. Therefore, it is necessary to realize collision avoidance for MAC layer based on existing MAC protocol of wireless sensor. The collision aware MAC (CAMAC) using the idea of filter and power control was proposed. The principle of CAMAC handling different collisions was discussed, and CAMAC was simulated by NS.

Key words: wireless sensing network, collision aware, Medium Access Control (MAC) protocol

摘要： 无线传感网络是事件触发的网络，其中包含大量的节点。提出了同源冲突和非同源冲突的概念：将同一事件触发多个节点动作称为同源冲突；不同事件触发的多个节点动作称为非同源冲突。这两种冲突都会造成网络数据流量的下降和节点能量的浪费。因此，需要在现有无线传感的MAC层协议的基础上，实现MAC层的冲突避免。使用筛选和功率控制思想设计了冲突感知MAC协议CAMAC，详细论述了CAMAC对不同类型冲突的处理原理，使用NS进行仿真，并给出了仿真结果。

关键词: 无线传感网络, 冲突感知, 介质存取控制协议