Abstract: AODV is an on-demand routing protocol which is specifically designed for MANET.It’s revealed that the performance of this protocol degrades drastically as the load becomes heavy or the topology changes frequently.It represents a Location Aided AODV Routing Protocol to improve its performance.The mobile node determin the broadcasting restricted area by its position obtained.The message’s transmit area is limited to the restricted area.In this way，the number of the message transmitted，the retransmit nodes involved and the confliction reduce.This results in a significant reduction in the number of routing overhead.The experiment confirms that the improved protocol obtains a better performance when the heavy load and the frequent topology changes appear.

Key words: Mobile Ad Hoc Networks（MANET）, Ad Hoc On-Demand Distance Vector（AODV）, location aided, broadcasting restricted area

摘要： AODV协议是专门针对移动自组网设计的一种按需路由协议。当网络负载比较重、网络拓扑变化比较剧烈时，AODV的路由开销比较大，性能下降严重。为改善其性能，提出了基于位置辅助的改进型AODV路由协议。节点利用获得的自己的地理位置信息，计算出广播受限区域，将消息的广播范围限制在该广播受限区域内，以减少消息的传播数量以及中间转发节点的个数，减少消息冲突，从而降低路由开销。仿真实验表明改进协议在高负载、高拓扑变化的场合中拥有比AODV更好的性能表现。

关键词: 无线移动自组网, 自组织网络按需距离向量, 位置辅助, 广播受限区域