The value of tAdvCfgSampleInterval specifies the interval for sampling
the child's offered rate. A value of '1' of tAdvCfgSampleInterval
represents fastest sampling rate available while a value of '8'
represents slowest sampling period available.
When tAdvCfgSampleInterval is set to '4', time average factor
adjustments to new offered rate measurements specified by
tAdvCfgPolicyName are removed.