A method for operating a specific mobile device moving from a source cell to a destination cell, the method comprising: - using, by the specific mobile device, a source sidelink to exchange signals with a following mobile device, source sidelink resources being managed by a source base station operating the source cell, whereby the specific and following mobile devices are located within the source cell and the following mobile device is following the specific mobile device in a same general direction of movement; - switching, by the specific mobile device, from the source sidelink to a fallback link to exchange signals with the following mobile device, the fallback link resources being managed independently from any base station and implemented by an intelligent transport system, ITS, G5 peer-to-peer communication link, by a Wifi radio link operating in ad-hoc mode, by the use of a 3GPP PC5 interface operating in autonomous scheduling mode, by resources from a pool of resources signaled by a base station, or by resources preconfigured in the specific mobile device, whereby the switching, by the specific mobile device, from the source sidelink to the fallback link to exchange signals with the following mobile device, comprises the specific mobile device sending a switching message to the following mobile device, the switching message comprising configuration information for the fallback link; - switching, by the specific mobile device, from the fallback link to a destination sidelink to exchange signals with the following mobile device, destination sidelink resources being managed by a destination base station operating the destination cell, whereby the specific device and the following device are located within the destination cell. - using, by the specific mobile device, a source sidelink to exchange signals with a following mobile device, source sidelink resources being managed by a source base station operating the source cell, whereby the specific and following mobile devices are located within the source cell and the following mobile device is following the specific mobile device in a same general direction of movement; - switching, by the specific mobile device, from the source sidelink to a fallback link to exchange signals with the following mobile device, the fallback link resources being managed independently from any base station and implemented by an intelligent transport system, ITS, G5 peer-to-peer communication link, by a Wifi radio link operating in ad-hoc mode, by the use of a 3GPP PC5 interface operating in autonomous scheduling mode, by resources from a pool of resources signaled by a base station, or by resources preconfigured in the specific mobile device, whereby the switching, by the specific mobile device, from the source sidelink to the fallback link to exchange signals with the following mobile device, comprises the specific mobile device sending a switching message to the following mobile device, the switching message comprising configuration information for the fallback link; - switching, by the specific mobile device, from the fallback link to a destination sidelink to exchange signals with the following mobile device, destination sidelink resources being managed by a destination base station operating the destination cell, whereby the specific device and the following device are located within the destination cell.