ANT+ and UPSM (ultra power saving mode)

I have a Samsung device with ANT+ support and i would like to connect to ANT+ devices when in UPS(ultra power saving) mode. However, in UPS mode with bluetooth enabled, the ANT+ is not working. Whereas in normal mode ANT+ works when Bluetooth is enabled. Note that: ANT+ uses the same range of frequencies than WIFI and Bluetooth 4 Some specific details: ANT HAL service: 3.0.0 ANT Radio service: 4.16.00 ANT+ Plugins 3.6.40 (I can't tag it as 'ant+')