3.2.6.1 Per-Network Interface Object Wireless Statistics Monitor Timer Expiry

When this timer starts, the sink MUST take a snapshot of the counters returned by the wireless network interface associated with a Network Interface Object and it MUST add a new row to the Wireless Statistics History. If the history reaches its maximum size, the oldest row MUST be removed to make room for the new row of snapshot. Although the Retry Delta, Transmitted Delta, FCS Error Delta, and Received Delta counters are tracked relative to those from the previous timer expiry interval, if this is the first time the history is written to, the original absolute counter value MUST be written to the history instead.

Next, the Normal Send Model History SHOULD be updated using the same snapshot data if the Transmitted Delta is greater or equal to 100. In that case, the Send Model Average and Send Model Variance MUST also be recomputed. The average is computed by adding up all scores from Normal Send Model History divided by the number of history entries. The variance is computed by adding up the square of each score from the history divided by the number of history entries.

The Normal Receive Model History SHOULD be updated using the same snapshot data if the Received Delta is greater or equal to 100. In that case, the Receive Model Average and Receive Model Variance MUST also be recomputed. The average is computed by adding up all scores from the Normal Receive Model History divided by the number of history entries. The variance is computed by adding up the square of each score from the history divided by the number of history entries.

The sink MUST increment the Sample Index by one.