Pilot Detection
Threshold (T_ADD)
Any Pilot that is
strong but is not in the Handoff Direction Message is a source of interference.
This Pilot should be immediately moved into the active set for handoff to avoid
voice/data degradation or a possible drop call. T_ADD affects the percentage of
MS in handoff. It should be low enough to quickly add useful Pilots and high
enough to avoid false alarms due to noise.
Pilot Drop
Threshold (T_DROP)
This affects the
percentage of MS in handoff. It should be low enough to avoid dropping a good
Pilot that goes into a short fade . It should be high enough not to remove
quickly useful Pilots in the active or candidate state.
Pilot Drop Timer
(T_TDROP)
This is a timer.
Whenever the strength of a Pilot in the active set falls below a value of
T_DROP, a timer is started by the MS. If the Pilot strength goes back above
T_DROP, the timer is reset; otherwise the timer expires when a T_TDROP has
elapsed since the Pilot strength has fallen below T_DROP. Every MS maintain a
handoff drop timer for each Pilot in the Active and Candidate Sets.