This International Standard specifies methods and procedures to form groups for a spatial wireless power transfer system. The group of spatial wireless power transfer system including multiple power sources provides power transfer to receiving devices based on magnetic resonance technology. In order to achieve efficient power transfer to multiple receiving devices, this International Standard also specifies methods and procedures to set, share, and control the conditions of power transfer among multiple power sources and receiving devices. Note: It is expected that the devices receiving power is an audio, video and multimedia equipment.