Collecting system, collecting apparatus, and power control method
An observation system includes a plurality of nodes and an observation apparatus that collects information from the nodes using multi-hop communication for communicating with the nodes. The observation apparatus includes a link quality indicator (LQI) determination section and an output control section. The LQI determination section determines whether an LQI received from a node using the multi-hop communication is larger than a first threshold. When the LQI is larger than the first threshold, the output control section outputs a reduction command to the node associated with the LQI, the reduction command being a command to change the amount of transmission power in the multi-hop communication.
1. A collecting system comprising:
a plurality of nodes including a first processor; and
a collecting apparatus that collects information from the nodes using multi-hop communication for communicating with the nodes,
the collecting apparatus including a second processor configured to:
determine whether communication quality received from the node using the multi-hop communication is higher than a certain threshold; and
output a change command to the node associated with the communication quality when determining that the communication quality is higher than the certain threshold, the change command being a command to change an amount of transmission power in the multi-hop communication, wherein
the first processor is configured to:
determine whether deterioration is detected in communication with the collecting apparatus or a parent node of the node, the collecting apparatus and the parent node communicating with the node using the multi-hop communication;
increase the amount of transmission power in the multi-hop communication when determining that the deterioration is detected in the communication; and
start again the communication with the collecting apparatus or the parent node.
2. The collecting system according to claim 1 , wherein
the first processor is configured to:
determine whether it is detected that the communication with the collecting apparatus or the parent node is disabled after the amount of transmission power in the multi-hop communication is increased and the communication with the collecting apparatus or the parent node starts again; and
output a beacon signal for searching for other nodes capable of communicating with the node in the collecting system when detecting that the communication is disabled.
3. The collecting system according to claim 2 , wherein
the first processor is configured to:
determine that the node of the first processor is isolated in the collecting system when having failed to detect a response with respect to the beacon signal in a certain time period from the start timing of transmitting the beacon signal; and
determine whether a child node of the node is present when determining that the node is isolated; and
output a delete command to the child node when determining that the child node of the node is present, the delete command being a command to delete identification information identifying the parent node of the node.
4. The collecting system according to claim 3 , wherein
the first processor is configured to:
delete the identification information identifying the parent node of the node when receiving the delete command; and
output the beacon signal for searching for other nodes capable of communicating with the node in the collecting system.
5. A collecting apparatus comprising a processor configured to:
determine whether communication quality received from a node using multi-hop communication for communicating with a plurality of nodes is higher than a certain threshold; and
output a change command to the node associated with the communication quality when determining that the communication quality is higher than the certain threshold, the change command being a command to change an amount of transmission power in the multi-hop communication, wherein
the plurality of nodes include a processor configured to:
determine whether deterioration is detected in communication with the collecting apparatus or a parent node of the node, the collecting apparatus and the parent node communicating with the node using the multi-hop communication;
increase the amount of transmission power in the multi-hop communication when determining that the deterioration is detected in the communication; and
start again the communication with the collecting apparatus or the parent node.
6. A power control method that is implemented by an information processing apparatus, the power control method comprising:
determining, by a processor of the information processing apparatus, whether communication quality received from a node using multi-hop communication for communicating with a plurality of nodes is higher than a certain threshold; and
outputting, by the processor, a change command to the node associated with the communication quality when determining that the communication quality is higher than the certain threshold, the change command being a command to change an amount of transmission power in the multi-hop communication, wherein
the plurality of nodes include a processor configured to:
determine whether deterioration is detected in communication with the collecting apparatus or a parent node of the node, the collecting apparatus and the parent node communicating with the node using the multi-hop communication;
increase the amount of transmission power in the multi-hop communication when determining that the deterioration is detected in the communication; and
start again the communication with the collecting apparatus or the parent node.