中文摘要：

提出了一种无线传感器网络中基于定向扩散的拥塞与速率控制机制（CRDD），主要包含拥塞发生时的拥塞控制和拥塞消除之后的速率调节2个部分，其中拥塞控制由拥塞节点逐跳反馈拥塞通知消息实现，速率调节由接入网关（sink）定期更新速率调节消息实现．CRDD机制既能迅速缓解拥塞，又能在拥塞消除之后调节节点速率以减少网络能量消耗．

英文摘要：

A congestion and rate control scheme based on directed diffusion （CRDD） was presented, which comprises two mechanisms： congestion control when congestion occurs and rate adjustment when congestion disappears. The congestion control was achieved by congested node to feedback congestion notification massage hop-by-hop, while the rate adjustment was achieved by sink to refresh rate adjustment message periodically. CRDD can not only mitigate congestion rapidly, but also adjust sensor＇s rate to reduce network energy consumption.