Windows phone can't sync automatically via wireless network with Windows 7 PC

Hello, using lumia windows phone and trying to connect it with PC over wireless network to transfer files but couldn't succeed. My PC have zune software, have fine wiFi network but still not able to connect over Wireless network why? Any help!!

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First of all, your device and PC both should meet some requirements that are::

-> You have to use home Wifi network not workplace Wi-Fi
-> Ensure that both phone and pc are connected with same active WiFi network
-> All programs like videos or, music must be stopped on your phone
-> Battery must be full at least more than 50%

Now, follow the steps and check the steps to create wireless sync:

Step 1: Connect your device with PC via USB cable
Step 2: Open Zune software on your PC and go to Settings -> Phone -> Wireless Sync
Step 3: Follow the next instructions to make or, to complete the process.