I'm trying to use my Android HTC One for Bluetooth tethering (via Bluetooth PAN), so I can access internet on my Windows tablet (Dell Venue 8 Pro).
It works but I can't get any speed higher than 0.7 Mbit/s. Yeah, Wi-fi/USB tether works fine and I get way better speed, but I want to use Bluetooth over Wifi due to it's consuming less power and can be initiated from outside of the phone. Plugging USB cables also can be a hassle.
My setups are as follows:
Internet <--3G/Wifi--> Android (HTC One) <--BT Tether--> Windows 8.1 PC (Dell Venue 8 Pro)
Both HTC One and Dell Venue Pro 8 have Bluetooth v4.0, so I don't think the hardware involved being a limiting factor here, under Windows network status I can see 3 Mbit/s link
When tested with Speedtest.net APP on my HTC One I can get the full speed as usual
But when my DVP8 is tethered to my HTC one via BT this is what I'm getting: 
The 0.7mbps speed is consistent, I repeated the speed test several times. Which leads me to believe the BT throughput is capped for some reason.
I also have tested this on my Win8 Desktop PC and I'm getting exactly the same result. USB/WLAN tether gives me higher throughput, close to the speedtest app result.
According to Wikipedia the theoretical transfer speed limit for Bluetooth 4.0 is indeed 3Mbit/s, So I'm expecting 1-1.5mbit/s speed here. (It's the typical 3G bandwidth I can get on my area anyway).
Any thoughts? How can I get speed higher than 700kbps?
Any kind of experience or possible fix are welcome.
Thanks!
Answer
Found the culprit, The speed cap happened because the phone was connected to a Wi-Fi AP (effectively acting as Wifi repeater, but via BT). Perhaps something to do with the Wi-fi and BT uses same radio module, thus the speed limitation.
I can get decent throughput when tethering using 3G.
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