Method and apparatus for evaluating node performance and system

A control entity in a wireless network, including an apparatus for evaluating node performance, the apparatus being configured to:

• collect real-time communication related information of a network node, so as to obtain test data of the network node within a predetermined period of time, the test data including one or more of the following or a combination thereof:
• a packet drop ratio (PDR);
• a retry ratio;
• a channel state busy ratio (chan_busy_ratio);
• an average correlation value (corr_avg) of all acknowledgements (ACKs) within the predetermined period of time;
• an average value (rssi_avg) of received signal strength indicator (RSSI) values of all the ACKs within the predetermined period of time;
• and
• an average value (rssi_grad) of all absolute values of gradients of the RSSIs of all the ACKs within the predetermined period of time;
• perform normalization on the test data within the predetermined period of time by using preobtained best data vectors and worst data vectors, so as to obtain normalized multi-dimensional vectors of the test data within the period of time;
• and
• weight the normalized multi-dimensional vectors of the test data within the period of time, calculate distance from the weighted normalized multi-dimensional vectors to the best data vectors, and determine a grade of the network node according to the distance and a predefined monotonically decreasing function.

A communication system, including a coordinator and terminal equipment in communication with the coordinator;

• wherein, the communication system further includes a control entity, the control entity being configured to:
• collect real-time communication related information of a network node, so as to obtain test data of the network node within a predetermined period of time, the test data including one or more of the following or a combination thereof:
• a packet drop ratio (PDR);
• a retry ratio;
• a channel state busy ratio (chan_busy_ratio);
• an average correlation value (corr_avg) of all acknowledgements (ACKs) within the predetermined period of time;
• an average value (rssi_avg) of received signal strength indicator (RSSI) values of all the ACKs within the predetermined period of time;
• and
• an average value (rssi_grad) of all absolute values of gradients of the RSSIs of all the ACKs within the predetermined period of time;
• perform normalization on the test data within the predetermined period of time by using preobtained best data vectors and worst data vectors, so as to obtain normalized multi-dimensional vectors of the test data within the period of time;
• and
• weight the normalized multi-dimensional vectors of the test data within the period of time, calculate distance from the weighted normalized multi-dimensional vectors to the best data vectors, and determine a grade of the network node according to the distance and a predefined monotonically decreasing function.