| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To resolve the problem in a path control system of a wireless multi-hop network, that methods of transmitting a Hello message for confirming communication connection between nodes during movement of a node at a period shorter than a normal period to reduce the packet loss at the time of topology changes increase the load because of necessity for not only the moving node but also adjacent nodes to transmit Hello at the short period and increase the load furthermore in the case of simultaneous movement of nodes because of Hello transmission at the short period from all the moving nodes and waste a band because of transmission of a movement notification message even in the case of movement within a narrow range wherein a link state is not changed. <P>SOLUTION: A node has a function of notifying movement in one direction to establish a link, a function of switching between a flat path control and a hierarchical path control by autonomously determining a relative speed between nodes, and a function of suppressing the movement notification message on the basis of message reception quality of adjacent nodes, a movement distance, etc. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
