在进行异步AJAX调用时如何防止Android中的PhoneGap应用程序冻结？

I have PhoneGap-Android app and I am using Jquery. I am doing ASYNCHRONOUS AJAX call and during the call, app just freezes and waits after AJAX call finish ( it is mainly noticeable when on GSM connection ). I have PhoneGap-Android app and I am using Jque