Disclosed is a submersible pumping system for pumping wellbore fluids. Both optical waveguides include a core and a cladding layer enclosing the core. The surveying of the indoor environment determines a specific channel fading profile according to 30 subcarrier frequencies in a wireless signal for numerous locations within the indoor environment. Solder columns having a column shape and having a uniform length along a conveying direction thereof can be manufactured. The method may be performed by a trading strategy device disposed between a client device and multiple server side devices.