Closed Huawei b315s 936 how to disable idle connection?

I need help here. Im using polkomtel version. Is there any code or way to disable the idle connection? Or is there any way to automatically reconnect it to DC-HSPA+ connection. It happens when there's no one using the net. I use to have DC-HSPA+ connection since my area supports only 3G connection. Everytime no one uses the internet it will automatically disconnect and turn into UMTS connection once you use the internet instead of having DC-HSPA+ connection it turns to HSPA+ which has low connection compared to the other one. Though I have find a solution to this by pinging google using CMD but since im using 2 units of 936 I can't ping the other one at the same.

Anyone can help?