A phase change memory may be made with improved speed and stable characteristics over extended cycling. The system includes one or more ultra wideband transceivers installed on a vehicle and configured to transmit a request pulse at a request time. The new forwarding protocol allows the remote client to conduct point-to-point link protocols, such as point-to-point protocol and serial line interface protocol directly with the local network home gateway. Additionally, to achieve real-time operation, the detection and tracking is performed in the limited time budget of the frame duration. When the photographing button in the half-pressed state is pressed completely, image sensing processing is executed. Thus, even if enough data to fill an entire PDU is not in a channel buffer at the time of a channel request, the available data is transmitted so that the opportunity to transmit available SPE data is not lost.