Abstract: With the architecture of interconnecting MANETs and the Internet using multiple gateways，an Advertisement Interval Adaptive（AIA） gateway discovery method is proposed.In the AIA method，a metric named GSR（Gateway Solicitation Ratio）is designed and used to indicate the state of the MANET.All gateways adjust their broadcasting intervals adaptively according to the value of the GSR.Simulation results indicate that the AIA method achieves better performance than proactive，reactive and representative adaptive gateway discovery methods.

Key words: Mobile Ad Hoc Network（MANET）, Internet connectivity, gateway discovery, advertisement interval

摘要： 针对MANET与Internet的多网关互连结构，提出了一种通告间隔自适应网关发现方法，设计了网关请求率指标来反映MANET的网络状况，并据此调整网关的通告间隔。仿真结果表明，通告间隔自适应网关发现方法在提高互连性能的同时减少了网络开销，优于主动式、反应式和常用的自适应式网关发现方法。

关键词: 移动自组织网络（MANET）, 网络互连, 网关发现, 通告间隔