US Patent 9348824 Device group identification

Method and systems are provided for identification of device groups in a network. A playback device in a media playback system may send to a controller device, a transmission indicating a group identification associated with the playback device. The transmission may be sent in response to a request from the controller device for group identification information or a change in a group configuration of the playback device. The controller device may maintain a table of playback devices in the media playback system. The controller device may modify the table based on the transmission received from the playback device.