irat ho parameters in mvhhuawei system
DESCRIPTION
mhvjhTRANSCRIPT
IRAT HO Parameters in Huawei system
Function:
Use "SET UINTERRATHOCOV" command to set the parameters in the RNC-oriented
coverage-based inter-RAT handover measurement algorithm.
Coverage-based handovers are triggered by the 2D or 2F event. For coverage-based inter-
RAT handovers, inter-RAT measurement is required.
The reporting modes of coverage-based inter-RAT handovers consist of event-triggered
reporting mode and periodical reporting mode.
Note:
1. The value of Time to Trigger Handover to Non-Verified GSM Cell is greater than or
equal to that ofInter-RAT Period Reporting Interval.
2. The value of Time to Trigger for Verified GSM Cell should be smaller than or equal to
that of Time to Trigger Handover to Non-Verified GSM Cell.
3. The value of Time to Trigger Handover to Non-Verified GSM Cell or Time to
Trigger for Verified GSM Cell should be an integer multiple of the value of Inter-RAT
Period Reporting Interval.
4. Inter-RAT PS or CS Used Frequency Trigger THD is subject to 3A Measure
Quantity when the value of Inter-RAT Report Mode is EVENT_TRIGGER. It is invalid
when the value of Inter-RAT Report Mode isPERIODICAL_REPORTING.
Parameter ID Parameter
Name
Parameter Description
InterRatReportMode Inter-RAT Meaning: Inter-RAT measurement reporting
Parameter ID Parameter
Name
Parameter Description
Report
Mode
mode.
When PERIODICAL_REPORTING is selected, the
periodical reporting is used for inter-RAT
measurement. When EVENT_TRIGGER is
selected, the event-triggered reporting is used
for inter-RAT measurement.
The RNC provides two inter-RAT measurement
reporting modes, event-triggered reporting and
periodical reporting.
Event-triggered reporting
To avoid the ping-pong effect before and after
the inter-RAT handover, use event 3A (quality of
the currently used frequency is lower than the
absolute threshold and the signal level of the
GSM cell is higher than another absolute
threshold) as the triggering event that
determines the inter-RAT handover. To improve
the handover success rate, the BSIC of the GSM
cell whose event 3A needs to be triggered must
be decoded correctly by the UE. The reporting
mode of event 3A is not changed from event-
triggered reporting to periodical reporting.
Therefore, no handover re-attempt is made
when the handover fails unless event 3A is
triggered in this cell again.
The advantage of event-triggered reporting is
that the signaling transmission and processing
load are saved. Comparing the signal quality
between intra-frequency and inter-frequency
handovers, the ping-pong effect in handover is
prevented to some extent. The drawback of
event-triggered reporting is that the event is
reported only once and cannot be changed to
periodical reporting. For the cell-oriented
algorithm parameters, each time when the best
Parameter ID Parameter
Name
Parameter Description
cell is updated, the inter-frequency
measurement parameters should be updated
accordingly.
Periodical reporting
When the quality of the GSM cell reported by the
UE meets the criteria for inter-RAT handover,
the delay trigger timer is started. If the quality of
the GSM cell always meets the criteria for inter-
RAT handover before timeout, the inter-RAT
handover is triggered after the delay trigger
timer expires.
For the GSM cell whose BSIC can be decoded
correctly, a shorter delay trigger time should be
set to indicate the high priority attribute of the
GSM cell. For the GSM cell whose BSIC is not
verified, a longer delay trigger time should be
set to indicate the low priority attribute of the
GSM cell. In this manner, the BSIC can be
decoded faster.
If the handover fails, the handover re-attempt is
made again according to the periodical inter-
RAT measurement report.
The advantage of periodical reporting is that it
can be used for repeated handover re-attempts
on the same cell when the handover fails, and
that subsequent algorithms can be flexibly
developed. In addition, for the cell-oriented
algorithm parameters, the RNC updates the
parameters when making internal handover
decision and the system needs not to inform the
UEs of the parameter change through signaling
messages after the handovers. The drawback of
periodical reporting is that it requires large
amount of signaling and increases the load on
the air interface and for signaling processing.
Parameter ID Parameter
Name
Parameter Description
The two reporting modes have both advantage
and drawback. Currently, the traditional
periodical reporting mode is preferred.
GUI Value Range:
PERIODICAL_REPORTING(Periodical reporting),
EVENT_TRIGGER(Event trigger)
Actual Value Range: PERIODICAL_REPORTING,
EVENT_TRIGGER
Unit: None
Default Value: None
Recommended Value: PERIODICAL_REPORTING
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The advantage
of the periodical reporting mode is that it can be
used for repeated handover re-attempts on the
same cell when the handover fails, and that the
subsequent algorithms can be flexibly
developed. In addition, the UE needs not to be
informed when the parameters are changed.
The drawback of periodical reporting is that it
requires large amount of signaling and increases
the load on the air interface and for signaling
processing. The advantage of event-triggered
reporting is that the signaling transmission and
processing load are saved. Comparing the signal
quality between intra-frequency and inter-
frequency handovers, the ping-pong effect in
handover is prevented to some extent. The
drawback of event-triggered reporting is that
the event is reported only once and cannot be
changed to periodical reporting.
FilterCoefOf2D2F 2D/2F Filter Meaning: L3 filtering coefficient for event 2D or
Parameter ID Parameter
Name
Parameter Description
Coefficient event 2F measurement
If this parameter is set to a greater value, the
effect of smoothing signals and the ability of
anti-fast-fading improve. However, the ability of
tracing the signal change becomes low and call
drops are likely to occur because handover is
not performed in time. If this parameter is set to
a smaller value, the number of unnecessary
handovers increases.
The parameter has the same physical meaning
and measurement model as the inter-frequency
L3 filter coefficient. The reporting period is 480
ms. For specific analysis, see the intra-frequency
L3 filter coefficient and inter-frequency L3 filter
coefficient.
Parameter adjustment suggestions:
In cells where the average moving speed of UEs
is low, there is a comparatively big shadow
fading square error. Therefore, the
recommended value is 4. The value can be
increased in a certain degree.
In cells where the average moving speed of UEs
is medium, there is a comparatively smaller
shadow fading square error. Therefore, the
recommended value is 3.
In cells where the average moving speed of UEs
is high, there is a comparatively small shadow
fading square error. Therefore, the
recommended value is 2.
GUI Value Range: D0, D1, D2, D3, D4, D5, D6,
D7, D8, D9, D11, D13, D15, D17, D19
Actual Value Range: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
11, 13, 15, 17, 19
Unit: None
Parameter ID Parameter
Name
Parameter Description
Default Value: None
Recommended Value: D3
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, call drops are
likely to occur because handover is not
performed in time. If this parameter is set to a
smaller value, unnecessary inter-RAT handovers
may increase.
MeasQuantityOf3A 3A Measure
Quantity
Meaning: Measurement quantity used in
coverage-based inter-RAT measurement in
event 3A-triggered reporting mode.
When CPICH_Ec/No is selected, it indicates that
the Ec/No measurement quantity is used for
event 3A measurement. The physical unit is dB.
When CPICH_RSCP is selected, it indicates that
the RSCP measurement quantity is used for
event 3A measurement. The physical unit is
dBm.
When AUTO is selected, it indicates that the
Ec/No measurement quantity is used for event
3A measurement if the RNC receives Ec/No 2D
firstly. If the RNC receives the RSCP 2D firstly,
the RSCP measurement quantity is used for
event 3A measurement.
GUI Value Range: CPICH_EC/NO~0
CPICH_RSCP~1 AUTO
Actual Value Range: CPICH_EC/NO, CPICH_RSCP,
AUTO
Unit: None
Default Value: None
Parameter ID Parameter
Name
Parameter Description
Recommended Value: AUTO
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
EVENT_TRIGGER.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the
parameter value does not match the network
environment (for example, the Ec/No
measurement quantity is used for event 3A
measurement in areas with low RSCP), inter-RAT
handover may fail.
InterRATFilterCoef Inter-RAT
Filter
Coefficient
Meaning: This parameter specifies the Layer 3
filter coefficient for the inter-RAT measurement.
If this parameter is set to a greater value, the
effect of smoothing signals and the ability of
anti-fast-fading improve. However, the ability of
tracing the signal change becomes low and call
drops are likely to occur because handover is
not performed in time. If this parameter is set to
a smaller value, the number of unnecessary
handovers increases.
The parameter has the same physical meaning
and measurement model as the inter-frequency
L3 filter coefficient. The reporting period is 480
ms. For specific analysis, see the intra-frequency
L3 filter coefficient and inter-frequency L3 filter
coefficient.
Parameter adjustment suggestions:
In cells where the average moving speed of UEs
is low, there is a comparatively big shadow
fading square error. Therefore, the
recommended value is 4. The value can be
increased in a certain degree.
Parameter ID Parameter
Name
Parameter Description
In cells where the average moving speed of UEs
is medium, there is a comparatively smaller
shadow fading square error. Therefore, the
recommended value is 3.
In cells where the average moving speed of UEs
is high, there is a comparatively small shadow
fading square error. Therefore, the
recommended value is 2.
GUI Value Range: D0, D1, D2, D3, D4, D5, D6,
D7, D8, D9, D11, D13, D15, D17, D19
Actual Value Range: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
11, 13, 15, 17, 19
Unit: None
Default Value: None
Recommended Value: D3
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a greater value, the effect of
smoothing signals and the ability of anti-fast-
fading improve. However, the ability of tracing
the signal change becomes low, and call drops
are likely to occur because handover is not
performed in time. If this parameter is set to a
smaller value, the number of unnecessary Inter-
RAT handovers increases.
WeightForUsedFreq Weight for
Used
Frequency
Meaning: The parameter WeightForUsedFreq is
the frequency weighting factor used to calculate
the quality of the current frequency.
This parameter is used for event 3A evaluation.
For detailed information of this parameter, refer
to 3GPP TS 25.133.
Parameter ID Parameter
Name
Parameter Description
To set this parameter, see the method for
setting the intra-frequency handover weighting
factor Weight.
GUI Value Range: 0~20
Actual Value Range: 0~2, step:0.1
Unit: None
Default Value: None
Recommended Value: 0
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a greater value, the
estimated general quality of the current
frequency in the same condition is higher. In this
case, inter-RAT handover is unlikely to be
triggered. If this parameter is set to a smaller
value, the estimated general quality of the
current frequency in the same condition is
lower. In this case, inter-frequency handover is
likely to be triggered. When the parameter value
is set to 0, the quality of the best cell in an
active set is regarded as the general quality of
an active set.
InterRATPeriodReportInterval Inter-RAT
Period
Reporting
Interval
Meaning: Interval that the UE reports inter-RAT
measurement results to the RNC.
This parameter specifies the interval that the UE
sends inter-RAT measurement results to the
RNC in periodical reporting mode. It is not
recommended that this parameter is set to
NON_PERIODIC_REPORT since the UE behavior
may be unknown.
The GSM RSSI measurement period is 480 ms.
Parameter ID Parameter
Name
Parameter Description
Therefore, the inter-RAT periodical reporting
interval should be longer than 480 ms. If the
periodical reporting interval is excessively high,
the handover decision time will be long, and
handovers will be slow.
The adjustment should be made according to
the configured GSM RSSI measurement
compressed mode sequence. According to the
current configured GSM RSSI measurement
compressed mode sequence, the RSSI
measurement of eight GSM cells can be finished
in 480 ms. Therefore, the RSSI measurement of
16 GSM cells can be finished in 1000 ms.
According to 3GPP specifications, the number of
inter-RAT neighboring cells should not exceed
32. Therefore, the parameter value can be set to
2000 ms if the number of neighboring GSM cells
exceeds 16.
The setting of this parameter has impact on the
Uu signaling traffic. If the period is too short and
the reporting frequency is too high, the RNC
may have high load in processing signaling. If
the period is too long, the network cannot detect
the signal changes in time, which may delay the
inter-RAT handover and thus cause call drops.
GUI Value Range: NON_PERIODIC_REPORT(Non
periodical reporting), D250~1 D500~2 D1000~3
D2000~4 D3000~5 D4000~6 D6000~7
D8000~8 D12000~9 D16000~10 D20000~11
D24000~12 D28000~13 D32000~14 D64000
Actual Value Range: NON_PERIODIC_REPORT,
250, 500, 1000, 2000, 3000, 4000, 6000, 8000,
12000, 16000, 20000, 24000, 28000, 32000,
64000
Unit: ms
Parameter ID Parameter
Name
Parameter Description
Default Value: None
Recommended Value: D1000
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
PERIODICAL_REPORTING.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter has impact on the Uu signaling
traffic. If the period is too short and the
reporting frequency is too high, the RNC may
have high load in processing signaling. If the
period is too long, the network cannot detect the
signal changes in time, which may delay the
inter-RAT handover and thus cause call drops.
Hystfor2D 2D
Hysteresis
Meaning: Hysteresis for event 2D.
This parameter is used to avoid the ping-pong
reporting of event 2D (the estimated quality of
the currently used frequency is below a certain
threshold). The value of this parameter is
associated with slow fading. If this parameter is
set to a greater value, the probability of ping-
pong reporting or wrong decision is lower, but
the event may not be triggered in time. If this
parameter is set to a smaller value, ping-pong
reporting of event 2D is likely to occur.
The setting of this parameter should consider
the radio conditions (slow fading), actual
handover distance, and moving speed of the UE.
The value of this parameter ranges from 2 dB to
5 dB. In addition, filter coefficient and triggering
delay must be considered in setting this
parameter.
GUI Value Range: 0~29
Parameter ID Parameter
Name
Parameter Description
Actual Value Range: 0~14.5, step:0.5
Unit: dB/ dBm
Default Value: None
Recommended Value: 4
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter should consider the radio
conditions (slow fading), actual handover
distance, and moving speed of the UE. If this
parameter is set to a greater value, the
probability of ping-pong reporting or wrong
decision is lower, but the event may not be
triggered in time.
Hystfor2F 2F
Hysteresis
Meaning: Hysteresis for event 2F.
The value of this parameter is associated with
slow fading. If this parameter is set to a greater
value, the probability of ping-pong reporting or
wrong decision is lower, but the event may not
be triggered in time.
The inter-RAT measurement hysteresis in
periodical reporting mode is used to prevent the
ping-pong reporting of event 2D (the estimated
quality of the currently used frequency is below
a certain threshold) and event 2F (the estimated
quality of the currently used frequency is above
a certain threshold). Event 2D is used to enable
the compressed mode and event 2F is used to
disable the compressed mode. Hystfor2D can
be increased slightly based on the
recommended value, considering inter-
frequency handover statistics. Hystfor2D can
also be increased slightly to prevent the
Parameter ID Parameter
Name
Parameter Description
compressed mode from being frequently
enabled and disabled and to avoid unnecessary
active set updates.
The setting of this parameter should consider
the radio conditions (slow fading), actual
handover distance, and moving speed of the UE.
The value of this parameter ranges from 2 dB to
5 dB. In addition, filter coefficient and triggering
delay must be considered in setting this
parameter.
GUI Value Range: 0~29
Actual Value Range: 0~14.5, step:0.5
Unit: dB/ dBm
Default Value: None
Recommended Value: 4
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter should consider the radio
conditions (slow fading), actual handover
distance, and moving speed of the UE. If this
parameter is set to a greater value, the
probability of ping-pong reporting or wrong
decision is lower, but the event may not be
triggered in time.
Hystfor3A 3A
Hysteresis
Meaning: Hysteresis for event 3A.
The value of this parameter is associated with
slow fading. If this parameter is set to a greater
value, the ability of resisting signal fluctuation
improves and the number of ping-pong
handovers decreases; however, the handover
algorithm becomes slow in responding to the
Parameter ID Parameter
Name
Parameter Description
signal change. If this parameter is set to a larger
value, the cell of another RAT where the UE
needs to be handed over to must be of good
quality. Therefore, the criteria for triggering the
inter-RAT handover decision is hard to be
fulfilled, and the call drop rate will increase.
The emulation result shows that in a cell where
the average moving speed of UEs is high (for
example, a cell that covers highways), this
parameter can be set to a smaller value 1.5 dB,
because in the cell the terrain is flat, barriers are
fewer, and thus the shadow fading variation is
small. In a cell where the average moving speed
of UEs is low, this parameter can be set to a
larger value 3.0 dB, because there are usually
many tall buildings and thus the shadow fading
variation is comparatively high.
GUI Value Range: 0~15
Actual Value Range: 0~7.5, step:0.5
Unit: dB
Default Value: None
Recommended Value: 4
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
EVENT_TRIGGER.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The value of
this parameter is associated with slow fading. If
this parameter is set to a larger value, the cell of
another RAT where the UE needs to be handed
over to must be of good quality. Therefore, the
criteria for triggering the inter-RAT handover
decision is hard to be fulfilled, and the call drop
Parameter ID Parameter
Name
Parameter Description
rate will increase. If this parameter is set to a
smaller value, ping-pong handover is likely to
occur.
HystforInterRAT Inter-RAT
Hysteresis
Meaning: Hysteresis for inter-RAT periodical
reporting.
This parameter is used to avoid incorrect
decisions caused by unexpected jitters of signals
during inter-RAT handover decisions.
HystforInterRAT and the inter-RAT handover
decision threshold determine whether to trigger
inter-RAT handovers.
If this parameter is set to a greater value, the
ability of resisting signal fluctuation improves
and the number of ping-pong handovers
decreases; however, the handover algorithm
becomes slow in responding to the signal
change. If this parameter is set to a larger value,
the cell of another RAT where the UE needs to
be handed over to must be of good quality.
Therefore, the criteria for triggering the inter-
RAT handover decision is hard to be fulfilled, and
the call drop rate will increase.
The emulation result shows that in a cell where
the average moving speed of UEs is high (for
example, a cell that covers highways), this
parameter can be set to a smaller value 1.5 dB,
because in the cell the terrain is flat, barriers are
fewer, and thus the shadow fading variation is
small. In a cell where the average moving speed
of UEs is low, this parameter can be set to a
larger value 3.0 dB, because there are usually
many tall buildings and thus the shadow fading
variation is comparatively high.
GUI Value Range: 0~15
Parameter ID Parameter
Name
Parameter Description
Actual Value Range: 0~7.5, step:0.5
Unit: dB
Default Value: None
Recommended Value: 0
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
PERIODICAL_REPORTING.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The value of
this parameter is associated with slow fading. If
this parameter is set to a larger value, the cell of
another RAT where the UE needs to be handed
over to must be of good quality. Therefore, the
criteria for triggering the inter-RAT handover
decision is hard to be fulfilled, and the call drop
rate will increase. If this parameter is set to a
smaller value, ping-pong handover is likely to
occur.
TrigTime2D 2D Event
Trigger
Delay Time
Meaning: Interval time between detection of
event 2D and sending of the measurement
report.
The value of this parameter is associated with
slow fading. If this parameter is set to a greater
value, the probability of incorrect decision
becomes low; however, the handover algorithm
becomes slow in responding to signal change.
The emulation result shows that the hysteresis
setting can effectively reduce the average
number of handovers and the number of
incorrect handovers, thus preventing
unnecessary handovers. The emulation result
also shows that the UE at different data rates
may react differently to the delay for triggering
Parameter ID Parameter
Name
Parameter Description
the event. For the fast-moving UE, the call drop
rate is more sensitive to the delay, whereas, for
the slow-moving UE, the call drop rate is less
sensitive to the delay. This can also reduce ping-
pong handovers and incorrect handovers.
Therefore, for the cell where most UEs are in
fast movement, this parameter can be set to a
smaller value, whereas for the cell where most
UEs are in slow movement, this parameter can
be set to a greater value. The value of this
parameter can be adjusted according to the
actual network statistics.
GUI Value Range: D0, D10, D20, D40, D60, D80,
D100, D120, D160, D200, D240, D320, D640,
D1280, D2560, D5000
Actual Value Range: 0, 10, 20, 40, 60, 80, 100,
120, 160, 200, 240, 320, 640, 1280, 2560, 5000
Unit: ms
Default Value: None
Recommended Value: D320
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The value of
this parameter is associated with slow fading. If
this parameter is set to a greater value, the
probability of incorrect decision becomes low;
however, the handover algorithm becomes slow
in responding to signal change.
TrigTime2F 2F Event
Trigger
Delay Time
Meaning: Interval time between detection of
event 2F and sending of the measurement
report.
The value of this parameter is associated with
Parameter ID Parameter
Name
Parameter Description
slow fading. If this parameter is set to a greater
value, the probability of incorrect decision
becomes low; however, the handover algorithm
becomes slow in responding to signal change.
The emulation result shows that the hysteresis
setting can effectively reduce the average
number of handovers and the number of
incorrect handovers, thus preventing
unnecessary handovers. The emulation result
also shows that the UE at different data rates
may react differently to the delay for triggering
the event. For the fast-moving UE, the call drop
rate is more sensitive to the delay, whereas, for
the slow-moving UE, the call drop rate is less
sensitive to the delay. This can also reduce ping-
pong handovers and incorrect handovers.
Therefore, for the cell where most UEs are in
fast movement, this parameter can be set to a
smaller value, whereas for the cell where most
UEs are in slow movement, this parameter can
be set to a greater value. The value of this
parameter can be adjusted according to the
actual network statistics.
GUI Value Range: D0, D10, D20, D40, D60, D80,
D100, D120, D160, D200, D240, D320, D640,
D1280, D2560, D5000
Actual Value Range: 0, 10, 20, 40, 60, 80, 100,
120, 160, 200, 240, 320, 640, 1280, 2560, 5000
Unit: ms
Default Value: None
Recommended Value: D1280
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Parameter ID Parameter
Name
Parameter Description
Impact on Network Performance: The value of
this parameter is associated with slow fading. If
this parameter is set to a greater value, the
probability of incorrect handover decision
becomes low; however, the handover algorithm
becomes slow in responding to signal change.
This leads to the decrease in the number of
handovers.
TrigTime3A 3A Event
Trigger
Delay Time
Meaning: Interval time between detection of
event 3A and sending of the measurement
report.
The value of this parameter is associated with
the slow fading. If this parameter is set to a
greater value, the probability of incorrect
handover decision becomes low; however, the
handover algorithm becomes slow in responding
to signal change. If this parameter is set to a
smaller value, the handover algorithm becomes
fast in responding to signal change; however,
the probability of incorrect decision becomes
high.
The emulation result shows that the hysteresis
setting can effectively reduce the average
number of handovers and the number of
incorrect handovers, thus preventing
unnecessary handovers. The emulation result
also shows that the UE at different data rates
may react differently to the delay for triggering
the event. For the fast-moving UE, the call drop
rate is more sensitive to the delay, whereas, for
the slow-moving UE, the call drop rate is less
sensitive to the delay. This can also reduce ping-
pong handovers and incorrect handovers.
Therefore, for the cell where most UEs are in
Parameter ID Parameter
Name
Parameter Description
fast movement, this parameter can be set to a
smaller value, whereas for the cell where most
UEs are in slow movement, this parameter can
be set to a greater value. The value of this
parameter can be adjusted according to the
actual network statistics.
The inter-frequency measurement reporting
period is 480 ms. Therefore, the trigger delay
time shorter than 480 ms is invalid.
If the parameter is set to a larger value,
handover is unlikely to be triggered. However,
call drops may increase as the parameter value
increases.
GUI Value Range: D0, D10, D20, D40, D60, D80,
D100, D120, D160, D200, D240, D320, D640,
D1280, D2560, D5000
Actual Value Range: 0, 10, 20, 40, 60, 80, 100,
120, 160, 200, 240, 320, 640, 1280, 2560, 5000
Unit: ms
Default Value: None
Recommended Value: D0
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
EVENT_TRIGGER.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the
parameter is set to a larger value, handover is
unlikely to be triggered. However, call drops
may increase as the parameter value increases.
TimeToTrigForNonVerify Time to
Trigger
Handover
Meaning: Time delay for triggering handovers to
GSM cells with non-verified BSIC.
During the period of time specified by this
Parameter ID Parameter
Name
Parameter Description
to Non-
Verified
GSM Cell
parameter, if the signal quality in a neighboring
GSM cell fulfills inter-RAT handover criteria and
the neighboring GSM cell is not verified, an inter-
RAT handover is triggered. When this parameter
value is 65535, the RNC does not perform inter-
RAT handovers to non-verified GSM cells. If this
parameter is set to a larger value, the average
number of handovers decreases, but call drops
may occur.
GUI Value Range: 0~64000, 65535
Actual Value Range: 0~64000, 65535
Unit: ms
Default Value: None
Recommended Value: 0
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
PERIODICAL_REPORTING.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the
parameter is set to a larger value, handover is
unlikely to be triggered. However, call drops
may increase as the parameter value increases.
TimeToTrigForVerify Time to
Trigger
Handover
to Verified
GSM Cell
Meaning: Time delay for triggering handovers to
GSM cells with verified BSIC.
During the period of time specified by this
parameter, if the signal quality in a neighboring
GSM cell fulfills inter-RAT handover criteria and
the neighboring GSM cell is verified, an inter-
RAT handover is triggered.
The criterion for triggering inter-RAT handover is
as follows:
Mother_RAT + CIO >= Tother_RAT + H/2
Parameter ID Parameter
Name
Parameter Description
If the quality of the neighboring GSM cell meets
the preceding criterion, the RAN starts the
trigger timer. After the timer expires, the RAN
makes inter-RAT handover decision. The length
of the trigger timer is called the time to trigger
verified GSM cell.
This parameter and the hysteresis are used
together to prevent incorrect decisions caused
by signal jitters during inter-RAT handover
decisions.
Considering that the UE is on the edge of the
system, this parameter should be set to a
comparatively low value. In situations where a
GSM cell is verified, the performance of the GSM
cell is generally regarded as good. In this case,
the parameter can be set to 0, which indicates
that the handover is performed immediately.
If this parameter is set to a larger value, the
average number of handovers decreases, but
call drops may occur.
GUI Value Range: 0~64000
Actual Value Range: 0~64000
Unit: ms
Default Value: None
Recommended Value: 0
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
PERIODICAL_REPORTING.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the
parameter is set to a larger value, handover is
unlikely to be triggered. However, call drops
may increase as the parameter value increases.
Parameter ID Parameter
Name
Parameter Description
BSICVerify BSIC Verify
Switch
Meaning: Switch for verifying the Base Station
Identity Code (BSIC).
This parameter is used to control cells where
inter-RAT measurement reports are triggered.
When the parameter is set to "REQUIRED", the
measurement reporting is triggered after the
BSIC of the measured cell is decoded correctly.
When the parameter is set to "NOT_REQUIRE",
the measurement reporting is triggered
regardless of whether the BSIC of the measured
cell is decoded correctly. This parameter is valid
for both periodical reporting mode and event-
triggered reporting mode. However, to ensure
handover reliability, it is recommended that the
system reports only the cells whose BSIC is
decoded correctly, that is, the recommended
value of the parameter is "REQUIRED". If the
parameter is set to "NOT_REQUIRED", handovers
are likely to be triggered, but the handover
reliability is lower than that in the situation the
parameter is set to "REQUIRED".
GUI Value Range: REQUIRED(Verify mode),
NOT_REQUIRE(Non-verify mode)
Actual Value Range: REQUIRED, NOT_REQUIRE
Unit: None
Default Value: None
Recommended Value: REQUIRED
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the
parameter is set to "NOT_REQUIRED", handovers
are likely to be triggered, but the handover
reliability is lower than the situation the
Parameter ID Parameter
Name
Parameter Description
parameter is set to "REQUIRED".
InterRATCSThd2DEcN0 Inter-RAT
CS Measure
Start Ec/No
THD
Meaning: Threshold of triggering inter-RAT
measurement for CS services when
measurement quantity is Ec/No.
The threshold of triggering the inter-RAT
measurement (the threshold of enabling the
compressed mode) is a key parameter in the
inter-RAT handover policy. The setting of this
parameter affects the proportion of the UEs in
compressed mode in a cell and the success rate
of the hard handover. The setting of this
parameter should consider two factors, moving
speed of the UE and cell radius.
When Ec/No is used as the measurement
quantity for CS services, the UE reports event
2D when the measured Ec/No value is lower
than this threshold. Then, the RNC sends the
signaling to enable the compressed mode and
start inter-RAT measurement.
For the UE moving at a speed of 5 km/h, the
recommended threshold is -17 dB; for the UE
moving at a speed of 50 km/h, the
recommended threshold is -14 dB; for the UE
moving at a speed of 120 km/h, the
recommended threshold is -12 dB. In actual
networks, set this parameter to -14 dB because
the UEs in a cell usually move at different
speeds. The emulation result shows that the call
drop rate remains low for the UEs moving at a
speed of 120 km/h when this parameter is set to
-14 dB.
If the cell is a macro cell, it indicates that micro
cells exist in this cell. To enable the micro cells
to handle more traffic, the compressed mode
Parameter ID Parameter
Name
Parameter Description
start and stop thresholds should be set higher,
that is, the thresholds for events 2D and 2F
using CPICH RSCP are set higher.
If the cell is a micro cell, the default value
should be modified according to the link
budgeting result.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively.
When the cell is located in the center of the
frequency coverage or the inter-frequency
measurement quantity uses both Ec/No and
RSCP, then the Ec/No value is used as the
criterion for events 2D and 2F. To enable the
compressed mode earlier, increase the
threshold of triggering event 2D; otherwise,
decrease the threshold of triggering event 2D.
To prevent the frequent enabling and disabling
of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively in
inter-RAT measurement. The requirements on
the signal quality and inter-RAT handover
policies vary with the service type. Therefore,
the thresholds of enabling and disabling inter-
RAT measurement are distinguished by CS, PS,
and signaling.
To enable the compressed mode earlier,
increase the threshold of triggering event 2D;
otherwise, decrease the threshold of triggering
event 2D. To prevent the frequent enabling and
disabling of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
Parameter ID Parameter
Name
Parameter Description
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -14
Parameter Relationship: The value of this
parameter must be smaller
than InterRatCsThd2FEcN0.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If this parameter is
set to a greater value, hard handover is likely to
be triggered, but ping-pong handover may
occur. If this parameter is set to a smaller value,
hard handover is unlikely to be triggered, but
call drops may occur.
InterRATCSThd2FEcN0 Inter-RAT
CS Measure
Stop Ec/No
THD
Meaning: Threshold of stopping inter-RAT
measurement for CS services when
measurement quantity is Ec/No.
The threshold of stopping the inter-RAT
measurement (the threshold of disabling the
compressed mode) is a key parameter in the
inter-RAT handover policy. The setting of this
parameter affects the proportion of the UEs in
compressed mode in a cell and the success rate
of the hard handover. The setting of this
parameter should consider two factors, moving
speed of the UE and cell radius.
When Ec/No is used as the measurement
quantity for CS services, the UE reports event 2F
Parameter ID Parameter
Name
Parameter Description
when the measured Ec/No value is higher than
the value of this parameter. Then, the RNC
sends the signaling to disable the compressed
mode and stop the inter-frequency
measurement.
If the cell is a macro cell, it indicates that micro
cells exist in this cell. To enable the micro cells
to handle more traffic, the compressed mode
start and stop thresholds should be set higher,
that is, the thresholds for events 2D and 2F
using CPICH RSCP are set higher.
If the cell is a micro cell, the default value
should be modified according to the link
budgeting result.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively.
When the cell is located in the center of the
frequency coverage or the inter-frequency
measurement quantity uses both Ec/No and
RSCP, then the Ec/No value is used as the
criterion for events 2D and 2F. To enable the
compressed mode earlier, increase the
threshold of triggering event 2D; otherwise,
decrease the threshold of triggering event 2D.
To prevent the frequent enabling and disabling
of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -12
Parameter Relationship: The value of this
Parameter ID Parameter
Name
Parameter Description
parameter must be larger
than InterRatCsThd2DEcN0.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If the threshold for
event 2F is set to a larger value, more UEs will
enter compressed mode, thus affecting user
experience. If the threshold for event 2F is set to
a smaller value, it becomes difficult for UEs to
trigger inter-RAT measurement, thus decreasing
handovers.
InterRATR99PsThd2DEcN0 Inter-RAT
R99 PS
Measure
Start Ec/No
THD
Meaning: Threshold of triggering inter-RAT
measurement for PS domain non-HSPA services
when the measurement quantity is Ec/No.
The threshold of triggering the inter-RAT
measurement (the threshold of enabling the
compressed mode) is a key parameter in the
inter-RAT handover policy. The setting of this
parameter affects the proportion of the UEs in
compressed mode in a cell and the success rate
of the hard handover. The setting of this
parameter should consider two factors, moving
speed of the UE and cell radius.
When Ec/No is used as the measurement
quantity for PS domain non-HSPA services, the
UE reports event 2D when the measured Ec/No
value is lower than this threshold. Then, the RNC
sends the signaling to enable the compressed
mode and start inter-RAT measurement.
For the UE moving at a speed of 5 km/h, the
recommended threshold is -17 dB; for the UE
Parameter ID Parameter
Name
Parameter Description
moving at a speed of 50 km/h, the
recommended threshold is -14 dB; for the UE
moving at a speed of 120 km/h, the
recommended threshold is -12 dB.
In actual networks, set this parameter to -14 dB
because the UEs in a cell usually move at
different speeds. The emulation result shows
that the call drop rate remains low for the UEs
moving at a speed of 120 km/h when this
parameter is set to -14 dB.
If the cell is a macro cell, it indicates that micro
cells exist in this cell. To enable the micro cells
to handle more traffic, the compressed mode
start and stop thresholds should be set higher,
that is, the thresholds for events 2D and 2F
using CPICH RSCP are set higher.
If the cell is a micro cell, the default value
should be modified according to the link
budgeting result.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively.
When the cell is located in the center of the
frequency coverage or the inter-frequency
measurement quantity uses both Ec/No and
RSCP, then the Ec/No value is used as the
criterion for events 2D and 2F. To enable the
compressed mode earlier, increase the
threshold of triggering event 2D; otherwise,
decrease the threshold of triggering event 2D.
To prevent the frequent enabling and disabling
of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively in
Parameter ID Parameter
Name
Parameter Description
inter-RAT measurement. The requirements on
the signal quality and inter-RAT handover
policies vary with the service type. Therefore,
the thresholds of enabling and disabling inter-
RAT measurement are distinguished by CS, PS,
and signaling.
To enable the compressed mode earlier,
increase the threshold of triggering event 2D;
otherwise, decrease the threshold of triggering
event 2D. To prevent the frequent enabling and
disabling of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -15
Parameter Relationship: The value of this
parameter must be smaller
than InterRatR99PsThd2FEcN0.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If this parameter is
set to a greater value, hard handover is likely to
be triggered, but ping-pong handover may
occur. If this parameter is set to a smaller value,
hard handover is unlikely to be triggered, but
call drops may occur.
InterRATHThd2DEcN0 Inter-RAT Meaning: Threshold of triggering inter-RAT
Parameter ID Parameter
Name
Parameter Description
HSPA
Measure
Start Ec/No
THD
measurement for HSPA services when
measurement quantity is Ec/No.
The threshold of triggering the inter-RAT
measurement (the threshold of enabling the
compressed mode) is a key parameter in the
inter-RAT handover policy. The setting of this
parameter affects the proportion of the UEs in
compressed mode in a cell and the success rate
of the hard handover. The setting of this
parameter should consider two factors, moving
speed of the UE and cell radius.
When Ec/No is used as the measurement
quantity for HSPA services, the UE reports event
2D when the measured Ec/No value is lower
than this threshold. Then, the RNC sends the
signaling to enable the compressed mode and
start inter-RAT measurement.
For the UE moving at a speed of 5 km/h, the
recommended threshold is -17 dB; for the UE
moving at a speed of 50 km/h, the
recommended threshold is -14 dB; for the UE
moving at a speed of 120 km/h, the
recommended threshold is -12 dB.
In actual networks, set this parameter to -14 dB
because the UEs in a cell usually move at
different speeds. The emulation result shows
that the call drop rate remains low for the UEs
moving at a speed of 120 km/h when this
parameter is set to -14 dB.
If the cell is a macro cell, it indicates that micro
cells exist in this cell. To enable the micro cells
to handle more traffic, the compressed mode
start and stop thresholds should be set higher,
that is, the thresholds for events 2D and 2F
using CPICH RSCP are set higher.
Parameter ID Parameter
Name
Parameter Description
If the cell is a micro cell, the default value
should be modified according to the link
budgeting result.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively.
When the cell is located in the center of the
frequency coverage or the inter-frequency
measurement quantity uses both Ec/No and
RSCP, then the Ec/No value is used as the
criterion for events 2D and 2F. To enable the
compressed mode earlier, increase the
threshold of triggering event 2D; otherwise,
decrease the threshold of triggering event 2D.
To prevent the frequent enabling and disabling
of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively in
inter-RAT measurement. The requirements on
the signal quality and inter-RAT handover
policies vary with the service type. Therefore,
the thresholds of enabling and disabling inter-
RAT measurement are distinguished by CS, PS,
and signaling.
To enable the compressed mode earlier,
increase the threshold of triggering event 2D;
otherwise, decrease the threshold of triggering
event 2D. To prevent the frequent enabling and
disabling of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
GUI Value Range: -24~0
Actual Value Range: -24~0
Parameter ID Parameter
Name
Parameter Description
Unit: dB
Default Value: None
Recommended Value: -15
Parameter Relationship: The value of this
parameter must be smaller
than InterRatHThd2FEcN0.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If this parameter is
set to a greater value, hard handover is likely to
be triggered, but ping-pong handover may
occur. If this parameter is set to a smaller value,
hard handover is unlikely to be triggered, but
call drops may occur.
InterRATR99PsThd2FEcN0 Inter-RAT
R99 PS
Measure
Stop Ec/No
THD
Meaning: Threshold of triggering inter-RAT
measurement for PS domain non-HSPA services
when the measurement quantity is Ec/No.
The threshold of stopping the inter-RAT
measurement (the threshold of disabling the
compressed mode) is a key parameter in the
inter-RAT handover policy. The setting of this
parameter affects the proportion of the UEs in
compressed mode in a cell and the success rate
of the hard handover. The setting of this
parameter should consider two factors, moving
speed of the UE and cell radius.
When Ec/No is used as the measurement
quantity for PS domain HSPA services, the UE
reports event 2F when the measured Ec/No
value is higher than this threshold. Then, the
RNC sends the signaling to disable the
Parameter ID Parameter
Name
Parameter Description
compressed mode and stop the inter-frequency
measurement.
If the cell is a macro cell, it indicates that micro
cells exist in this cell. To enable the micro cells
to handle more traffic, the compressed mode
start and stop thresholds should be set higher,
that is, the thresholds for events 2D and 2F
using CPICH RSCP are set higher.
If the cell is a micro cell, the default value
should be modified according to the link
budgeting result.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively.
When the cell is located in the center of the
frequency coverage or the inter-frequency
measurement quantity uses both Ec/No and
RSCP, then the Ec/No value is used as the
criterion for events 2D and 2F. To enable the
compressed mode earlier, increase the
threshold of triggering event 2D; otherwise,
decrease the threshold of triggering event 2D.
To prevent the frequent enabling and disabling
of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -13
Parameter Relationship: The value of this
parameter must be larger
than InterRatR99PsThd2DEcN0.
Service Interrupted After Modification : No (No
Parameter ID Parameter
Name
Parameter Description
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If the threshold for
event 2F is set to a larger value, more UEs will
enter compressed mode, thus affecting user
experience. If the threshold for event 2F is set to
a smaller value, it becomes difficult for UEs to
trigger inter-RAT measurement, thus decreasing
handovers.
InterRATHThd2FEcN0 Inter-RAT
HSPA
Measure
Stop Ec/No
THD
Meaning: Threshold of stopping inter-RAT
measurement for HSPA services when
measurement quantity is Ec/No.
The threshold of stopping the inter-RAT
measurement (the threshold of disabling the
compressed mode) is a key parameter in the
inter-RAT handover policy. The setting of this
parameter affects the proportion of the UEs in
compressed mode in a cell and the success rate
of the hard handover. The setting of this
parameter should consider two factors, moving
speed of the UE and cell radius.
When Ec/No is used as the measurement
quantity for HSPA services, the UE reports event
2F when the measured Ec/No value is higher
than the value of this parameter. Then, the RNC
sends the signaling to disable the compression
mode and stop the inter-frequency
measurement.
If the cell is a macro cell, it indicates that micro
cells exist in this cell. To enable the micro cells
to handle more traffic, the compressed mode
start and stop thresholds should be set higher,
Parameter ID Parameter
Name
Parameter Description
that is, the thresholds for events 2D and 2F
using CPICH RSCP are set higher.
If the cell is a micro cell, the default value
should be modified according to the link
budgeting result.
Event 2D and event 2F are used to enable and
disable the compressed mode respectively.
When the cell is located in the center of the
frequency coverage or the inter-frequency
measurement quantity uses both Ec/No and
RSCP, then the Ec/No value is used as the
criterion for events 2D and 2F. To enable the
compressed mode earlier, increase the
threshold of triggering event 2D; otherwise,
decrease the threshold of triggering event 2D.
To prevent the frequent enabling and disabling
of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -13
Parameter Relationship: The value of this
parameter must be larger
than InterRatHThd2DEcN0.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If the threshold for
event 2F is set to a larger value, more UEs will
Parameter ID Parameter
Name
Parameter Description
enter compressed mode, thus affecting user
experience. If the threshold for event 2F is set to
a smaller value, it becomes difficult for UEs to
trigger inter-RAT measurement, thus decreasing
handovers.
InterRATCSThd2DRSCP Inter-RAT
CS Measure
Start RSCP
THD
Meaning: Threshold of triggering inter-RAT
measurement for CS services when
measurement quantity is RSCP.
When RSCP is used as the measurement
quantity for CS services, the UE reports event
2D when the measured RSCP value is lower than
this threshold. Then, the RNC sends the
signaling to enable the compressed mode and
start the inter-RAT measurement.
To enable the compressed mode earlier,
increase the threshold of triggering event 2D;
otherwise, decrease the threshold of triggering
event 2D. To prevent the frequent enabling and
disabling of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
In most cases, users want to be maintained
within a 3G network. Therefore, the start
threshold of the inter-RAT measurement is set
smaller than that of the inter-frequency
measurement in order to trigger inter-frequency
easily. In scenarios where inter-frequency
neighboring cells are unavailable or where inter-
frequency coverage is insufficient, the inter-RAT
measurement start threshold should be set
relatively larger in order to trigger inter-RAT
measurement easily, thus reducing call drops.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Parameter ID Parameter
Name
Parameter Description
Unit: dBm
Default Value: None
Recommended Value: -100
Parameter Relationship: The value of this
parameter must be smaller
than InterRatCsThd2FRscp.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If this parameter is
set to a greater value, hard handover is likely to
be triggered, but ping-pong handover may
occur. If this parameter is set to a smaller value,
hard handover is unlikely to be triggered, but
call drops may occur.
InterRATCSThd2FRSCP Inter-RAT
CS Measure
Stop RSCP
THD
Meaning: Threshold of stopping inter-RAT
measurement for CS services when
measurement quantity is RSCP.
When RSCP is used as the measurement
quantity for CS services, the UE reports event 2F
when the measured RSCP value is larger than
this threshold. Then, the RNC sends the
signaling to disable the compressed mode and
stop the inter-RAT measurement.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -97
Parameter Relationship: The value of this
parameter must be larger
Parameter ID Parameter
Name
Parameter Description
than InterRatCsThd2DRscp.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the threshold
for event 2F is set to a larger value, more UEs
will enter compressed mode, thus affecting user
experience. If the threshold for event 2F is set to
a smaller value, it becomes difficult for UEs to
trigger inter-RAT measurement, thus decreasing
handovers.
InterRATR99PsThd2DRSCP Inter-RAT
R99 PS
Measure
Start RSCP
THD
Meaning: Threshold of triggering inter-RAT
measurement for PS domain non-HSPA services
when the measurement quantity is RSCP.
When RSCP is used as the measurement
quantity for PS domain non-HSPA services, the
UE reports event 2D when the measured RSCP
value is lower than this threshold. Then, the RNC
sends the signaling to enable the compressed
mode and start the inter-RAT measurement.
To enable the compressed mode earlier,
increase the threshold of triggering event 2D;
otherwise, decrease the threshold of triggering
event 2D. To prevent the frequent enabling and
disabling of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
In most cases, users want to be maintained
within a 3G network. Therefore, the start
threshold of the inter-RAT measurement is set
smaller than that of the inter-frequency
measurement in order to trigger inter-frequency
easily. In scenarios where inter-frequency
neighboring cells are unavailable or where inter-
frequency coverage is insufficient, the inter-RAT
Parameter ID Parameter
Name
Parameter Description
measurement start threshold should be set
relatively larger in order to trigger inter-RAT
measurement easily, thus reducing call drops.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -110
Parameter Relationship: The value of this
parameter must be smaller
than InterRatR99PsThd2FRscp.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If this parameter is
set to a greater value, hard handover is likely to
be triggered, but ping-pong handover may
occur. If this parameter is set to a smaller value,
hard handover is unlikely to be triggered, but
call drops may occur.
InterRATHThd2DRSCP Inter-RAT
HSPA
Measure
Start RSCP
THD
Meaning: Threshold of triggering inter-RAT
measurement for HSPA services when
measurement quantity is RSCP.
When RSCP is used as the measurement
quantity for HSPA services, the UE reports event
2D when the measured RSCP value is lower than
this threshold. Then, the RNC sends the
signaling to enable the compressed mode and
start the inter-RAT measurement.
To enable the compressed mode earlier,
increase the threshold of triggering event 2D;
Parameter ID Parameter
Name
Parameter Description
otherwise, decrease the threshold of triggering
event 2D. To prevent the frequent enabling and
disabling of the compressed mode, increase the
difference between the thresholds of triggering
event 2D and event 2F.
In most cases, users want to be maintained
within a 3G network. Therefore, the start
threshold of the inter-RAT measurement is set
smaller than that of the inter-frequency
measurement in order to trigger inter-frequency
easily. In scenarios where inter-frequency
neighboring cells are unavailable or where inter-
frequency coverage is insufficient, the inter-RAT
measurement start threshold should be set
relatively larger in order to trigger inter-RAT
measurement easily, thus reducing call drops.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -110
Parameter Relationship: The value of this
parameter must be smaller
than InterRatHThd2FRscp.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects the proportion of the UEs
in compressed mode in a cell and the success
rate of the hard handover. If this parameter is
set to a greater value, hard handover is likely to
be triggered, but ping-pong handover may
occur. If this parameter is set to a smaller value,
hard handover is unlikely to be triggered, but
Parameter ID Parameter
Name
Parameter Description
call drops may occur.
InterRATR99PsThd2FRSCP Inter-RAT
R99 PS
Measure
Stop RSCP
THD
Meaning: Threshold of stopping inter-RAT
measurement for PS domain non-HSPA services
when the measurement quantity is RSCP.
When RSCP is used as the measurement
quantity for PS domain non-HSPA services, the
UE reports event 2F when the measured RSCP
value is larger than this threshold. Then, the
RNC sends the signaling to disable the
compressed mode and stop the inter-RAT
measurement.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -107
Parameter Relationship: The value of this
parameter must be larger
than InterRatR99PsThd2DRscp.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the threshold
for event 2F is set to a larger value, more UEs
will enter compressed mode, thus affecting user
experience. If the threshold for event 2F is set to
a smaller value, it becomes difficult for UEs to
trigger inter-RAT measurement, thus decreasing
handovers.
InterRATHThd2FRSCP Inter-RAT
HSPA
Measure
Stop RSCP
THD
Meaning: Threshold of stopping inter-RAT
measurement for HSPA services when
measurement quantity is RSCP.
When RSCP is used as the measurement
quantity for HSPA services, the UE reports event
Parameter ID Parameter
Name
Parameter Description
2F when the measured RSCP value is larger than
this threshold. Then, the RNC sends the
signaling to disable the compressed mode and
stop the inter-RAT measurement.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -107
Parameter Relationship: The value of this
parameter must be larger
than InterRatHThd2DRscp.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If the threshold
for event 2F is set to a larger value, more UEs
will enter compressed mode, thus affecting user
experience. If the threshold for event 2F is set to
a smaller value, it becomes difficult for UEs to
trigger inter-RAT measurement, thus decreasing
handovers.
TargetRatCsThd Inter-RAT
CS
Handover
Decision
THD
Meaning: Quality requirement for the cell of
another RAT during inter-RAT handover for CS
domain services.
For CS services, if the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the criterion for
triggering event 3A. That is, event 3A is
triggered only when the quality of the target
frequency is higher than this threshold and the
measurement quality of the current CS services
is lower than the quality of the currently used
frequency. If the value of "Inter-RAT Reporting
Parameter ID Parameter
Name
Parameter Description
Mode" is set to "PERIODICAL_REPORTING", this
parameter is used to evaluate inter-RAT
coverage handovers at the RNC. Note that 0
means a value smaller than -110 dBm.
If the value of "Inter-RAT Reporting Mode" is set
to "PERIODICAL_REPORTING", this parameter is
used for the assessment of inter-RAT coverage
handover. That is, Tother_RAT in the following
formulas. This parameter is the absolute
threshold of the cell of another RAT (Received
Signal Strength Indicator: RSSI) for the inter-RAT
handover decision.
If the quality of the cell of another RAT in the
inter-RAT measurement report fulfils the
following criterion:
Mother_RAT + CIO >= Tother_RAT + H/2
Then, the system starts the trigger timer, and
makes the handover decision after the timer
expires. If the quality of the cell of another RAT
fulfills the following criterion before timeout:
Mother_RAT + CIO < Tother_RAT - H/2
The RNC stops the timer and waits for another
inter-RAT measurement report.
Here,
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
The sensitivity of a GSM mobile phone is -102
Parameter ID Parameter
Name
Parameter Description
dBm. Considering a margin of 3 dB for
compensation of fast fading, 5 dB for
compensation of slow fading, 2 dB for
compensation of interference noise, and 2 dB for
compensation of ambient noise, the outdoor
reception level should not be lower than -90
dBm.
The parameter value can vary with the handover
policy. To have UEs handed over only to GSM
cells of high quality, the inter-RAT handover
decision threshold can be set to a comparatively
large value, for example -85 dBm.
GUI Value Range: 0~63
Actual Value Range: lower than -110, -110~-
48(Actual value meets the condition: Actual
Value = GUI Value - 111)
Unit: dBm
Default Value: None
Recommended Value: 16
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects number of hard
handovers. If this parameter is set to a greater
value, hard handover is likely to be triggered,
but ping-pong handover may occur. If this
parameter is set to a smaller value, hard
handover is unlikely to be triggered, but call
drops may occur.
TargetRatR99PsThd Inter-RAT
R99 PS
Handover
Meaning: Quality requirement for the cell of
another RAT during inter-RAT handover for PS
domain non-HSPA services.
Parameter ID Parameter
Name
Parameter Description
Decision
THD
For PS domain non-HSPA services, if the value of
"Inter-RAT Reporting Mode" is set to
"EVENT_TRIGGER", this parameter is used to set
the criterion for triggering event 3A. That is,
event 3A is triggered only when the quality of
the target frequency is higher than this
threshold and the measurement quality of the
current PS services is lower than the quality of
the currently used frequency. If the value of
"Inter-RAT Reporting Mode" is set to
"PERIODICAL_REPORTING", this parameter is
used to evaluate inter-RAT coverage handovers
at the RNC. Note that 0 means a value smaller
than -110 dBm.
If the value of "Inter-RAT Reporting Mode" is set
to "PERIODICAL_REPORTING", this parameter is
used for the assessment of inter-RAT coverage
handover. That is, Tother_RAT in the following
formulas. This parameter is the absolute
threshold of the cell of another RAT (Received
Signal Strength Indicator: RSSI) for the inter-RAT
handover decision.
If the quality of the cell of another RAT in the
inter-RAT measurement report fulfils the
following criterion:
Mother_RAT + CIO >= Tother_RAT + H/2
Then, the system starts the trigger timer, and
makes the handover decision after the timer
expires. If the quality of the cell of another RAT
fulfills the following criterion before timeout:
Mother_RAT + CIO < Tother_RAT - H/2
The RNC stops the timer and waits for another
inter-RAT measurement report.
Here,
Parameter ID Parameter
Name
Parameter Description
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
The sensitivity of a GSM mobile phone is -102
dBm. Considering a margin of 3 dB for
compensation of fast fading, 5 dB for
compensation of slow fading, 2 dB for
compensation of interference noise, and 2 dB for
compensation of ambient noise, the outdoor
reception level should not be lower than -90
dBm.
The parameter value can vary with the handover
policy. To have UEs handed over only to GSM
cells of high quality, the inter-RAT handover
decision threshold can be set to a comparatively
large value, for example -85 dBm.
GUI Value Range: 0~63
Actual Value Range: lower than -110, -110~-
48(Actual value meets the condition: Actual
Value = GUI Value - 111)
Unit: dBm
Default Value: None
Recommended Value: 16
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
Parameter ID Parameter
Name
Parameter Description
this parameter affects number of hard
handovers. If this parameter is set to a greater
value, hard handover is likely to be triggered,
but ping-pong handover may occur. If this
parameter is set to a smaller value, hard
handover is unlikely to be triggered, but call
drops may occur.
TargetRatHThd Inter-RAT
HSPA
Handover
Decision
THD
Meaning: Quality requirement for the cell of
another RAT during inter-RAT handover for HSPA
services.
For PS services, if the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the criterion for
triggering event 3A. That is, event 3A is
triggered only when the quality of the target
frequency is higher than this threshold and the
measurement quality of the current PS services
is lower than the quality of the currently used
frequency. If the value of "Inter-RAT Reporting
Mode" is set to "PERIODICAL_REPORTING", this
parameter is used to evaluate inter-RAT
coverage handovers at the RNC. Note that 0
means a value smaller than -110 dBm.
If the value of "Inter-RAT Reporting Mode" is set
to "PERIODICAL_REPORTING", this parameter is
used for the assessment of inter-RAT coverage
handover. That is, Tother_RAT in the following
formulas. This parameter is the absolute
threshold of the cell of another RAT (Received
Signal Strength Indicator: RSSI) for the inter-RAT
handover decision.
If the quality of the cell of another RAT in the
inter-RAT measurement report fulfils the
following criterion:
Parameter ID Parameter
Name
Parameter Description
Mother_RAT + CIO >= Tother_RAT + H/2
Then, the system starts the trigger timer, and
makes the handover decision after the timer
expires. If the quality of the cell of another RAT
fulfills the following criterion before timeout:
Mother_RAT + CIO < Tother_RAT - H/2
The RNC stops the timer and waits for another
inter-RAT measurement report.
Here,
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
The sensitivity of a GSM mobile phone is -102
dBm. Considering a margin of 3 dB for
compensation of fast fading, 5 dB for
compensation of slow fading, 2 dB for
compensation of interference noise, and 2 dB for
compensation of ambient noise, the outdoor
reception level should not be lower than -90
dBm.
The parameter value can vary with the handover
policy. To have UEs handed over only to GSM
cells of high quality, the inter-RAT handover
decision threshold can be set to a comparatively
large value, for example -85 dBm.
GUI Value Range: 0~63
Actual Value Range: lower than -110, -110~-
48(Actual value meets the condition: Actual
Parameter ID Parameter
Name
Parameter Description
Value = GUI Value - 111)
Unit: dBm
Default Value: None
Recommended Value: 16
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: The setting of
this parameter affects number of hard
handovers. If this parameter is set to a greater
value, hard handover is likely to be triggered,
but ping-pong handover may occur. If this
parameter is set to a smaller value, hard
handover is unlikely to be triggered, but call
drops may occur.
UsedFreqCsThdEcN0 Inter-RAT
CS Used
Frequency
Trigger
Ec/No THD
Meaning: Ec/No quality threshold for used
frequency of CS services.
For CS services, if Ec/No is used as the
measurement quantity for inter-RAT
measurement and the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the measurement
control of event 3A. That is, event 3A is
triggered only when the quality of the currently
used frequency is lower than this threshold and
the TargetRatCsThd criterion is fulfilled.
The following factors should be considered
during setting:
When the value of "Inter-RAT Reporting Mode" is
set to "EVENT_TRIGGER", the quality of the
currently used frequency fulfills the criterion
QUsed <= TUsed - H3a/2, and the quality of the
target frequency fulfills the criterion Mother_RAT
Parameter ID Parameter
Name
Parameter Description
+ CIO >= Tother_RAT + H/2, the RNC starts the
trigger timer and reports event 3A when the
timer expires.
Here,
QUsed is the estimated quality of the currently
used frequency of UTRAN.
Tused is the quality threshold for the currently
used frequency of GSM.
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
When the signal quality of the currently used
frequency is poor, that is, below the specified
value of this parameter, you can infer that the
frequency cannot meet the coverage
requirements of the current services. Event 2F
indicates that the quality of the currently used
frequency is restored. Therefore, this parameter
is usually set lower than the triggering threshold
of event 2F, or is set equally to the triggering
threshold of event 2D.
For combined services, the parameter
configuration for CS services should be adopted
as long as CS services are involved.
Impact on network performance:
If this parameter is set to a larger value, event
3A is likely to be triggered. However, handover
is likely to be triggered when the frequency
Parameter ID Parameter
Name
Parameter Description
quality in the current system is acceptable for
the UE if the value of this parameter is set too
large.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -12
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, event 3A is
likely to be triggered. However, handover is
likely to be triggered when the frequency quality
in the current system is acceptable for the UE if
the value of this parameter is set too large.
UsedFreqR99PsThdEcN0 Inter-RAT
R99 PS
Used
Frequency
Trigger
Ec/No THD
Meaning: Ec/No quality threshold for used
frequency of PS domain non-HSPA services.
For PS domain non-HSPA services, if Ec/No is
used as the measurement quantity for inter-RAT
measurement and the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the measurement
control of event 3A. That is, event 3A is
triggered only when the quality of the currently
used frequency is lower than this threshold and
the TargetRatR99PsThd criterion is fulfilled.
The following factors should be considered
during setting:
When the value of "Inter-RAT Reporting Mode" is
set to "EVENT_TRIGGER", the quality of the
currently used frequency fulfills the criterion
Parameter ID Parameter
Name
Parameter Description
QUsed <= TUsed - H3a/2, and the quality of the
target frequency fulfills the criterion Mother_RAT
+ CIO >= Tother_RAT + H/2, the RNC starts the
trigger timer and reports event 3A when the
timer expires.
Here,
QUsed is the estimated quality of the currently
used frequency of UTRAN.
Tused is the quality threshold for the currently
used frequency of GSM.
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
When the signal quality of the currently used
frequency is poor, that is, below the specified
value of this parameter, you can infer that the
frequency cannot meet the coverage
requirements of the current services. Event 2F
indicates that the quality of the currently used
frequency is restored. Therefore, this parameter
is usually set lower than the triggering threshold
of event 2F, or is set equally to the triggering
threshold of event 2D.
For combined services, the parameter
configuration for CS services should be adopted
as long as CS services are involved.
Impact on network performance:
If this parameter is set to a larger value, event
Parameter ID Parameter
Name
Parameter Description
3A is likely to be triggered. However, handover
is likely to be triggered when the frequency
quality in the current system is acceptable for
the UE if the value of this parameter is set too
large.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -13
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, event 3A is
likely to be triggered. However, handover is
likely to be triggered when the frequency quality
in the current system is acceptable for the UE if
the value of this parameter is set too large.
UsedFreqHThdEcN0 Inter-RAT
HSPA Used
Frequency
Trigger
Ec/No THD
Meaning: Ec/No quality threshold for used
frequency of HSPA services.
For HSPA services, if Ec/No is used as the
measurement quantity for inter-RAT
measurement and the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the measurement
control of event 3A. That is, event 3A is
triggered only when the quality of the currently
used frequency is lower than this threshold and
the TargetRatR99PsThd criterion is fulfilled.
The following factors should be considered
during setting:
When the value of "Inter-RAT Reporting Mode" is
Parameter ID Parameter
Name
Parameter Description
set to "EVENT_TRIGGER", the quality of the
currently used frequency fulfills the criterion
QUsed <= TUsed - H3a/2, and the quality of the
target frequency fulfills the criterion Mother_RAT
+ CIO >= Tother_RAT + H/2, the RNC starts the
trigger timer and reports event 3A when the
timer expires.
Here,
QUsed is the estimated quality of the currently
used frequency of UTRAN.
Tused is the quality threshold for the currently
used frequency of GSM.
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
When the signal quality of the currently used
frequency is poor, that is, below the specified
value of this parameter, you can infer that the
frequency cannot meet the coverage
requirements of the current services. Event 2F
indicates that the quality of the currently used
frequency is restored. Therefore, this parameter
is usually set lower than the triggering threshold
of event 2F, or is set equally to the triggering
threshold of event 2D.
For combined services, the parameter
configuration for CS services should be adopted
as long as CS services are involved.
Parameter ID Parameter
Name
Parameter Description
Impact on network performance:
If this parameter is set to a larger value, event
3A is likely to be triggered. However, handover
is likely to be triggered when the frequency
quality in the current system is acceptable for
the UE if the value of this parameter is set too
large.
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -13
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, event 3A is
likely to be triggered. However, handover is
likely to be triggered when the frequency quality
in the current system is acceptable for the UE if
the value of this parameter is set too large.
UsedFreqCsThdRscp Inter-RAT
CS Used
Frequency
Trigger
RSCP THD
Meaning: RSCP quality threshold for used
frequency of CS domain services.
For CS services, if RSCP is used as the
measurement quantity for inter-RAT
measurement and the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the measurement
control of event 3A. That is, event 3A is
triggered only when the quality of the currently
used frequency is lower than this threshold and
the TargetRatCsThd criterion is fulfilled.
The following factors should be considered
Parameter ID Parameter
Name
Parameter Description
during setting:
When the value of "Inter-RAT Reporting Mode" is
set to "EVENT_TRIGGER", the quality of the
currently used frequency fulfills the criterion
QUsed <= TUsed - H3a/2, and the quality of the
target frequency fulfills the criterion Mother_RAT
+ CIO >= Tother_RAT + H/2, the RNC starts the
trigger timer and reports event 3A when the
timer expires.
Here,
QUsed is the estimated quality of the currently
used frequency of UTRAN.
Tused is the quality threshold for the currently
used frequency of GSM.
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
When the signal quality of the currently used
frequency is poor, that is, below the specified
value of this parameter, you can infer that the
frequency cannot meet the coverage
requirements of the current services. Event 2F
indicates that the quality of the currently used
frequency is restored. Therefore, this parameter
is usually set lower than the triggering threshold
of event 2F, or is set equally to the triggering
threshold of event 2D.
For combined services, the parameter
Parameter ID Parameter
Name
Parameter Description
configuration for CS services should be adopted
as long as CS services are involved.
Impact on network performance:
If this parameter is set to a larger value, event
3A is likely to be triggered. However, handover
is likely to be triggered when the frequency
quality in the current system is acceptable for
the UE if the value of this parameter is set too
large.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -97
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, event 3A is
likely to be triggered. However, handover is
likely to be triggered when the frequency quality
in the current system is acceptable for the UE if
the value of this parameter is set too large.
UsedFreqR99PsThdRscp Inter-RAT
R99 PS
Used
Frequency
Trigger
RSCP THD
Meaning: RSCP quality threshold for used
frequency of PS domain non-HSPA services.
For PS domain non-HSPA services, if RSCP is
used as the measurement quantity for inter-RAT
measurement and the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the measurement
control of event 3A. That is, event 3A is
triggered only when the quality of the currently
used frequency is lower than this threshold and
Parameter ID Parameter
Name
Parameter Description
the TargetRatR99PsThd criterion is fulfilled.
The following factors should be considered
during setting:
When the value of "Inter-RAT Reporting Mode" is
set to "EVENT_TRIGGER", the quality of the
currently used frequency fulfills the criterion
QUsed <= TUsed - H3a/2, and the quality of the
target frequency fulfills the criterion Mother_RAT
+ CIO >= Tother_RAT + H/2, the RNC starts the
trigger timer and reports event 3A when the
timer expires.
Here,
QUsed is the estimated quality of the currently
used frequency of UTRAN.
Tused is the quality threshold for the currently
used frequency of GSM.
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
When the signal quality of the currently used
frequency is poor, that is, below the specified
value of this parameter, you can infer that the
frequency cannot meet the coverage
requirements of the current services. Event 2F
indicates that the quality of the currently used
frequency is restored. Therefore, this parameter
is usually set lower than the triggering threshold
of event 2F, or is set equally to the triggering
Parameter ID Parameter
Name
Parameter Description
threshold of event 2D.
For combined services, the parameter
configuration for CS services should be adopted
as long as CS services are involved.
Impact on network performance:
If this parameter is set to a larger value, event
3A is likely to be triggered. However, handover
is likely to be triggered when the frequency
quality in the current system is acceptable for
the UE if the value of this parameter is set too
large.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -107
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, event 3A is
likely to be triggered. However, handover is
likely to be triggered when the frequency quality
in the current system is acceptable for the UE if
the value of this parameter is set too large.
UsedFreqHThdRscp Inter-RAT
HSPA Used
Frequency
Trigger
RSCP THD
Meaning: RSCP quality threshold for used
frequency of HSPA services.
For HSPA services, if RSCP is used as the
measurement quantity for inter-RAT
measurement and the value of "Inter-RAT
Reporting Mode" is set to "EVENT_TRIGGER",
this parameter is used to set the measurement
control of event 3A. That is, event 3A is
Parameter ID Parameter
Name
Parameter Description
triggered only when the quality of the currently
used frequency is lower than this threshold and
the TargetRatR99PsThd criterion is fulfilled.
The following factors should be considered
during setting:
When the value of "Inter-RAT Reporting Mode" is
set to "EVENT_TRIGGER", the quality of the
currently used frequency fulfills the criterion
QUsed <= TUsed - H3a/2, and the quality of the
target frequency fulfills the criterion Mother_RAT
+ CIO >= Tother_RAT + H/2, the RNC starts the
trigger timer and reports event 3A when the
timer expires.
Here,
QUsed is the estimated quality of the currently
used frequency of UTRAN.
Tused is the quality threshold for the currently
used frequency of GSM.
Mother_RAT is the measurement result of the
GSM RSSI.
Tother_RAT is the inter-RAT handover decision
threshold.
Cell Individual Offset (CIO) is the offset for the
cell of another inter-RAT.
H represents the hysteresis, the setting of which
can reduce wrong decisions caused by signal
jitters.
When the signal quality of the currently used
frequency is poor, that is, below the specified
value of this parameter, you can infer that the
frequency cannot meet the coverage
requirements of the current services. Event 2F
indicates that the quality of the currently used
frequency is restored. Therefore, this parameter
Parameter ID Parameter
Name
Parameter Description
is usually set lower than the triggering threshold
of event 2F, or is set equally to the triggering
threshold of event 2D.
For combined services, the parameter
configuration for CS services should be adopted
as long as CS services are involved.
Impact on network performance:
If this parameter is set to a larger value, event
3A is likely to be triggered. However, handover
is likely to be triggered when the frequency
quality in the current system is acceptable for
the UE if the value of this parameter is set too
large.
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -107
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, event 3A is
likely to be triggered. However, handover is
likely to be triggered when the frequency quality
in the current system is acceptable for the UE if
the value of this parameter is set too large.
InterRATMeasTime Inter-RAT
Measure
Timer
Length
Meaning: Length of the timer for inter-RAT
measurement.
After inter-RAT measurement starts, if no inter-
RAT handover is performed when this timer
expires, the inter-RAT measurement is stopped.
In addition, the compressed mode (if activated)
Parameter ID Parameter
Name
Parameter Description
should be deactivated. The value 0 indicates
that the inter-RAT measurement timer is not
started.
The following factors should be considered
during setting:
This parameter is designed to prevent that the
UE being in compressed mode for a long time
when the handover criteria are not fulfilled,
because the UE does not move or is moving in a
low speed. If the compressed mode is
maintained for a long time, the service quality is
adversely affected and the total available
capacity of the system decreases.
Most inter-RAT handovers can be finished within
60s.
Impact on network performance:
If the parameter is set to a smaller value, the UE
cannot finish inter-RAT handover. If the
parameter is set to a larger value, the
compressed mode will not be disabled, thus
affecting UE measurement. In actual networks,
statistics can be made to obtain the delay for a
successful inter-RAT handover, thus to get a
proper value of InterRATMeasTime that
satisfies most UEs.
GUI Value Range: 0~512
Actual Value Range: 0~512
Unit: s
Default Value: None
Recommended Value: 60
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Parameter ID Parameter
Name
Parameter Description
Impact on Network Performance: If the
parameter is set to a smaller value, the UE
cannot finish inter-RAT handover. If the
parameter is set to a larger value, the user
experience is affected.
InterRATPingPongTimer Inter-RAT
Ping-Pong
Timer
Meaning: Length of the timer to avoid ping-pong
handovers between 2G and 3G networks.
When a UE in the CS domain is handed over
from a 2G network to a 3G network, the system
increases the hysteresis used for event 3A to
prevent the ping-pong handover between the 2G
network and the 3G network in the period
specified by this parameter. During the penalty
time, the previous periodical report will be
changed to the event 3A report. The value 0
indicates that the system does not take
measures to avoid ping-pong handover between
2G and 3G networks.
GUI Value Range: 0~65535
Actual Value Range: 0~65535
Unit: s
Default Value: None
Recommended Value: 0
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, the UEs
handed out from the 2G network are unlikely to
be handed back to the 2G network. If this
parameter is set to a smaller value, the effect of
penalty is unobvious, causing ping-pong
handover between 2G and 3G networks.
Parameter ID Parameter
Name
Parameter Description
InterRATPingPongHyst Inter-RAT
Ping-Pong
Hysteresis
Meaning: Hysteresis to avoid ping-pong
handover between 2G and 3G networks.
When a UE in the CS domain is handed over
from a 2G network to a 3G network, the system
increases the hysteresis used for event 3A to
prevent the ping-pong handover between the 2G
network and the 3G network in the handover
penalty period specified
by InterRATPingPongTimer. During the
penalty time, event-triggered reporting is used
for inter-RAT measurement. The value 0
indicates that the system does not take
measures to avoid ping-pong handover between
2G and 3G networks.
GUI Value Range: 0~15
Actual Value Range: 0~7.5, step:0.5
Unit: dBm
Default Value: None
Recommended Value: 0
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, the UEs
handed over from the 2G network are unlikely to
be handed over back to the 2G network. If this
parameter is set to a smaller value, the risk for
ping-pong handovers increases.
PeriodFor3A 3A Event
Retry
Period
Meaning: Interval between handover attempts
for event 3A.
This parameter specifies the interval between
handover attempts for event 3A. If this
parameter is set to a smaller value, handover
Parameter ID Parameter
Name
Parameter Description
attempts increase when the inter-RAT handover
fails. In this case, the UE can be quickly handed
over to the target cell whose load is reduced,
thus lowering the probability of call drops. More
handover re-attempts, however, cause the
increase in the RNC load.
GUI Value Range: 1~64
Actual Value Range: 500~32000, step:500
Unit: ms
Default Value: None
Recommended Value: 1
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
EVENT_TRIGGER.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a smaller value, handover
attempts increase when the inter-RAT handover
fails. In this case, the UE can be quickly handed
over to the target cell whose load is reduced,
thus lowering the probability of call drops. More
handover re-attempts, however, cause the
increase in the RNC load.
AmntOfRpt3A 3A Event
Maximum
Retry Times
Meaning: Maximum number of handover
attempts after inter-RAT handover triggered by
event 3A fails.
This parameter specifies the maximum number
of handover re-attempts for event 3A when the
measurement control is valid. If this parameter
is set to a greater value, the number of inter-
RAT handover re-attempts increases and the
possibility of successfully handing over the UE to
Parameter ID Parameter
Name
Parameter Description
the target cell whose load becomes normal
increases. After reaching the value specified by
this parameter, the RNC makes no further
handover attempt to the target cell. If the
compressed mode is disabled, the handover re-
attempt will be aborted.
GUI Value Range: 0~63
Actual Value Range: 0~62, 63: Infinity
Unit: None
Default Value: None
Recommended Value: 4
Parameter Relationship: This parameter is valid
whenInterRatReportMode is set to
EVENT_TRIGGER.
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, handover
attempts increase when the inter-RAT handover
fails. In this case, the UE can be quickly handed
over to the target cell whose load is reduced,
thus lowering the probability of call drops. More
handover re-attempts, however, cause the
increase in the RNC load.
InterRatPhyChFailNum Inter-RAT
HO Physical
Channel
Failure THD
Meaning: Maximum number of inter-RAT
handover failures allowed due to physical
channel failure. When the number of inter-RAT
handover failures due to physical channel failure
exceeds the threshold, a penalty is given to the
UE. During the time specified by
[PARA]PenaltyTimeForInterRatPhyChFail[/para],
the UE is not allowed to make inter-RAT
handover attempts.
Parameter ID Parameter
Name
Parameter Description
For details about the physical channel failure,
see 3GPP TS 25.331.
GUI Value Range: 0~63
Actual Value Range: 0~63
Unit: None
Default Value: None
Recommended Value: 3
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a smaller value, many users
will not be handed over to the 2G network in
time. If this parameter is set to a larger value,
the penalty effect is unobvious.
PenaltyTimeForPhyChFail Inter-RAT
HO Physical
Channel
Failure
Penalty
Timer
Meaning: Duration of the penalty for inter-RAT
handover failure due to physical channel failure.
The UE is not allowed to make inter-RAT
handover attempts within the penalty time.
For details about the physical channel failure,
see 3GPP TS 25.331.
GUI Value Range: 0~65535
Actual Value Range: 0~65535
Unit: s
Default Value: None
Recommended Value: 30
Parameter Relationship: None
Service Interrupted After Modification : No (No
impact on the UE in idle mode)
Impact on Network Performance: If this
parameter is set to a larger value, many users
will not be handed over to the 2G network in
Parameter ID Parameter
Name
Parameter Description
time. If this parameter is set to a smaller value,
the penalty effect is unobvious.