The reasons are analyzed,and a modification method is presented, in which DSR controls antenna pattern used by transmitting node,part of packets are sent with omni-antenna and the others are sent with directional antenna.

• 分折了此现象产生原因,并提出了一个改进方法; 由DSR协议参与控制分组发送时使用的天线模式,对部分影响协议性能最为严重的分组采用全向发送,其余分组使用方向天线发送。