RLT - Radio Link Timeout
When SACCH is not decoded this
counter is decreased by 1 when it is reaches to zero it result normal call
drop. In this period if SACCH is decoded counter is increased by 2.
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This parameter indicate how much time call
maintained when radio environments is bed.
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If RLT value is high then call is sustain longer
time. it is affected to customer
customers perception.
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Highway and in building cells have higher value
of RLT parameter and it is give better improvement of call drops.
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This parameter is define in AMRFR & AMRHR
and also Non AMRFR & Non AMRHR
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We can also check this on TEMS radio parameter
window
one time slot lasts 0.577ms,
Bursts period is 4.615ms
1 SACCH Period= 4.615X104
bursts (4x26=104 bursts) = 480ms
Now Radio Link Time Counter:-
It is depend on SACCH blocks.
This parameter defines the
maximum value of the radio link counter expressed in SACCH blocks. Range of 4 –
64 in step size of 4.
Value of RLT. Normally 16, 20,
24.
If RLT value is 16 then call is
sustain around- 7.6 Sec( 16 *480ms) when SACCH will not decoded
If RLT value is 20 then call is
sustain around -9.6 Sec( 20*480ms)
If RLT value is 24 then call is
sustain around -11.5 Sec( 24*480ms)
RLT Measure in TEMS Radio
Parameters
RL Timeout Counter (Cur) : This
parameter define the maximum value of the radio link counter expressed in SACCH
blocks. Range of 4 – 64 in step size of 4. it shows current value of RLT.
Decrease by 1 but increase by 2. When it reaches zero it results in normal DROP
Call.
RL Timeout Counter (MAX) : This
parameter define the maximum value of the radio link counter expressed in SACCH
blocks. Range of 4 – 64 in step size of 4. it shows current value of RLT.
Normally 16, 20, 24.
