A method for mobility determination, the method being performed by a mobility determination apparatus and comprising: determining channel state information, CSI, for a wireless channel between a mobile device and a wireless access point, AP ; and using the CSI to determine movement between the mobile device and the wireless AP , the method characterised in that the method further comprises: in response to a determination that the mobile device is moving relative to the wireless AP : determining time-of-flight, ToF, for a signal traversal between the mobile device and the wireless access point, AP, ; and using the ToF for the signal traversal between the mobile device and the wireless AP to determine a speed of movement of the mobile device relative to the wireless AP , wherein using the CSI to determine movement between the mobile device and the wireless AP further comprises: determining a plurality of CSI vectors that represent the CSI at different times; and determining correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP . determining channel state information, CSI, for a wireless channel between a mobile device and a wireless access point, AP ; and using the CSI to determine movement between the mobile device and the wireless AP , the method characterised in that the method further comprises: in response to a determination that the mobile device is moving relative to the wireless AP : determining time-of-flight, ToF, for a signal traversal between the mobile device and the wireless access point, AP, ; and using the ToF for the signal traversal between the mobile device and the wireless AP to determine a speed of movement of the mobile device relative to the wireless AP , wherein using the CSI to determine movement between the mobile device and the wireless AP further comprises: determining a plurality of CSI vectors that represent the CSI at different times; and determining correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP . in response to a determination that the mobile device is moving relative to the wireless AP : determining time-of-flight, ToF, for a signal traversal between the mobile device and the wireless access point, AP, ; and using the ToF for the signal traversal between the mobile device and the wireless AP to determine a speed of movement of the mobile device relative to the wireless AP , determining time-of-flight, ToF, for a signal traversal between the mobile device and the wireless access point, AP, ; and using the ToF for the signal traversal between the mobile device and the wireless AP to determine a speed of movement of the mobile device relative to the wireless AP , wherein using the CSI to determine movement between the mobile device and the wireless AP further comprises: determining a plurality of CSI vectors that represent the CSI at different times; and determining correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP . determining a plurality of CSI vectors that represent the CSI at different times; and determining correlation within at least one pair of the plurality of CSI vectors to determine the movement between the mobile device and the wireless AP . <EOS>