Which kind of wake lock does Xiia Live Pro invoke?

Sascha Zimmer 10 years ago updated by Mossan 10 years ago 1
Buffer underruns caused by connection losses seem to be fewer when my Nexus 5 is manually put in screen_dim_wakelock mode while running Xiia Live Pro on longer road trips. These dropouts seem sometimes to be caused by slow cell handovers within mobile networks, or when changing into areas with different coverage (e. g. from 4G to 3G or even EDGE/GPRS or vice versa) but as well by local network gaps. I know Xiia uses some kind of wakelock, but I still got the subjective impression that putting the device into the relatively alert state as described above, the phone goes through the mobile network changes in a more swift way, reducing the dropouts in number and length. So I wonder whether this is a valid observation or just caused by chance?
Why is it impossible for modems and smartphones to connect automaticly from a 3G network to a 4 G network when you listned to an audiostream from a radiostation without stopping the audiostream?

If you stop the audiostream you have to wait for about 30-45 seconds before the network will change from 3G to 4G. In an ordinary smartphone you can't force the unit to stay at the 4g network. In a lot of portable 4g Wi-fi routers you can do that!!

Why will not all units (smartphones) automaticly change from 3G to 4G when you listened to an audiostream?
What's wrong?