Embodiments of the invention include methods of providing flexible sounding reference signal (SRS) transmission in a wireless communication network. In one embodiment, a method is implemented in a network device for configuring sounding reference signal (SRS) transmission from a terminal device to the network device, the method comprises: transmitting, by a network device to a terminal device, an indication of a plurality of alternative SRS transmission selections; and detecting, by the network device from a signal of the terminal device, a SRS transmission based on the plurality of alternative SRS transmission selections.