| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a node device achieving a multi-hop radio system capable of executing frequency switchover processing at low cost. <P>SOLUTION: The node device forms a multi-hop network along with a termination device to be an apex of a tree-structured multi-hop network. On detection of a deteriorated radio propagation environment with a one-hop upper-level device, which is a termination device located at a one-hop upper level or another node device located at a one-hop upper level, the node device transmits to the one-hop upper-level device a frequency change request to request to change a frequency for use for communication within a predetermined range by another node device and a termination device, located within a predetermined range including the self-device, to a second frequency different from a first frequency having been used so far. <P>COPYRIGHT: (C)2013,JPO&INPIT |
