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HUAWEI TECHNOLOGIES CO., LTD.
Omantel 3G handover to GSM Topic Report
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 2
The PI instruction for 3G handover to GSM(CS) IRATHO.AttRelocPrepOutCS; IRATHO.SuccRelocPrepOutCS;
IRATHO.AttOutCS; IRATHO.SuccOutCS;
INDEX
The parameters for 3G handover to GSM(CS)InterRatReportMode; InterRATFilterCoef; Hystfor2D; Hystfor2F;
InterRATPeriodReportInterval; HystforInterRAT; TrigTime2D;
TrigTime2F;InterRATCSThd2DEcN0;InterRATCSThd2FEcN0; InterRATCSThd2DRSCP;
InterRATCSThd2FRSCP; TargetRatCsThd; InterRATMeasTime;
CONTENTS
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 3
Measurement point
The measurement is triggered at point A B C D as shown in the picture:
The counter and PI instruction for 3G handover to GSM(CS)
IRATHO.AttRelocPrepOutCSWhen the RNC sends the CN a RELOCATION REQUIRED message as point A, this counter is measured in the best cell that the UE camps on. IRATHO.SuccRelocPrepOutCSWhen the RNC receives from the CN a RELOCATION COMMAND message as point B this counter is measured in the best cell that the UE camps on. IRATHO.AttOutCSWhen the RNC sends the UE a HANDOVER FROM UTRAN COMMAND message as point C, this counter is measured in the best cell that the UE camps on. IRATHO.SuccOutCSWhen the RNC receives an IU RELEASE COMMAND message with the cause value of "Successful Relocation" as point D, the outgoing handover succeeds and this counter is measured in the best cell that the UE camps on.
IRATHO.SuccRelocPrepOutCS.Cell.Rate = IRATHO.SuccRelocPrepOutCS / IRATHO.AttRelocPrepOutCS
IRATHO.SuccOutCS.Cell.Rate = IRATHO.SuccOutCS / IRATHO.AttOutCS
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 4
Kind of IRATHO
The counter and PI instruction for 3G handover to GSM(CS)
The causes for outgoing inter-RAT handover can be load, RF (coverage, QoS, or HCS), inter-RAT DRD, or service type. The cause inter-RAT DRD only exists in the inter-RAT CS handover.
VS.IRATHO.SuccRelocPrepOutCS.RF(VS.IRATHO.AttOutPS.TrigRscp, VS.IRATHO.AttOutCS.TrigEcNo)
VS.IRATHO.SuccRelocPrepOutCS.Load
VS.IRATHO.SuccRelocPrepOutCS.Service
Common failure
IRATHO.FailRelocPrepOutCS.NoResAvail -- No Resource Available
IRATHO.FailOutCS.CfgUnsupp -- Configuration Unsupported
IRATHO.FailRelocPrepOutCS.TgtFail -- Relocation Failure in Target CN/RNC or Target System
RATHO.FailOutCS.PhyChFail -- Physical Channel Failure
VS.IRATHO.FailOutCS.NoReply -- Timer Waiting out for Iu Release Command
VS.IRATHO.FailRelocPrepOutCS.ReqInfoNotAvail -- Requested Information Not Available
IRATHO.FailRelocPrepOutCS.HigherTrafficLod -- Traffic Load In The Target Cell Higher Than In The
Source Cell
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 5
The PI instruction for 3G handover to GSM(CS) IRATHO.AttRelocPrepOutCS; IRATHO.SuccRelocPrepOutCS;
IRATHO.AttOutCS; IRATHO.SuccOutCS;
INDEX
The parameters for 3G handover to GSM(CS) InterRatReportMode; InterRATFilterCoef; Hystfor2D; Hystfor2F;
InterRATPeriodReportInterval; HystforInterRAT; TrigTime2D; TrigTime2F;
InterRATCSThd2DEcN0; InterRATCSThd2FEcN0; InterRATCSThd2DRSCP;
InterRATCSThd2FRSCP; TargetRatCsThd; InterRATMeasTime;
CONTENTS
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 6
InterRatReportMode -- Inter-RAT measurement reporting mode:
EVENT_TRIGGER
To avoid the ping-pong effect before and after the inter-RAT handover, use event 3A as the triggering event
that determines the inter-RAT handover.
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.
The parameters for 3G handover to GSM(CS)
The advantage of event-triggered reporting is that the signaling transmission and processing load are saved.
The ping-pong effect in handover is prevented to some extent by 3A. The drawback of event-triggered
reporting is that the event is reported only once and cannot be changed to periodical reporting.
The advantage of periodical reporting is that it can be used for repeated handover re-attempts on the same
cell when the handover fails. The drawback of periodical reporting is that it requires large amount of signaling
and increases the load on the UU interface and for signaling processing.
• Current netwrok setting(1st Oct): All cell be set to PERIODICAL_REPORTING
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 7
InterRATFilterCoef -- Inter-RAT Filter Coefficient
The parameters for 3G handover to GSM(CS)
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.
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, D19Actual Value Range: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19Unit: NoneDefault Value: NoneRecommended Value: D3• Current network setting(1st Oct): All cell be set to D3
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 8
InterRATPeriodReportInterval -- Period Reporting Interval
The parameters for 3G handover to GSM(CS)
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. The
GSM RSSI measurement period is 480 ms. Therefore, the inter-RAT periodical reporting interval should
be longer than 480 ms.
If 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 ; Default Value: None
Recommended Value: D1000
• Current netwrok setting(1st Oct): All cell be set to D1000
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 9
InterRATMeasTime -- Inter-RAT Measure Timer Length
The parameters for 3G handover to GSM(CS)
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) should be deactivated. The value 0 indicates that the inter-RAT
measurement timer is not started.
This parameter is designed to prevent that the UE being in compressed mode for a long time when the
handover criteria are not fulfilled. 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.
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. Most inter-RAT
handovers can be finished within 60s.
GUI Value Range: 0~512
Actual Value Range: 0~512
Unit: s
Default Value: None
Recommended Value: 60
• Current netwrok setting(1st Oct): All cell be set to 60
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 10
TargetRatCsThd -- Inter-RAT CS Handover Decision THD
The parameters for 3G handover to GSM(CS)
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.
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.
The setting of this parameter affects number of hard handovers. If this parameter is set to a smaller value,
hard handover is likely to be triggered, but ping-pong handover may occur. If this parameter is set to a greater
value, hard handover is unlikely to be triggered, but call drops may occur.
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
• Current netwrok setting(1st Oct): All cell be set to 16 (-95dBm)
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 11
InterRATCSThd2DEcN0 -- Inter-RAT CS Measure Start Ec/No THD
InterRATCSThd2FEcN0 -- Inter-RAT CS Measure Stop Ec/No THD
The parameters for 3G handover to GSM(CS)
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -14
GUI Value Range: -24~0
Actual Value Range: -24~0
Unit: dB
Default Value: None
Recommended Value: -12
2D EC/N0value number of cell proportion-14dB 1909 72.42%-12dB 823 26.76%-10dB 30 0.81%
2F EC/N0value number of cell proportion-12dB 1909 73.01%-10dB 823 26.23%-8dB 30 0.76%
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 12
InterRATCSThd2DRSCP -- Inter-RAT CS Measure Start RSCP THD
InterRATCSThd2FRSCP -- Inter-RAT CS Measure Stop RSCP THD
The parameters for 3G handover to GSM(CS)
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -100
GUI Value Range: -115~-25
Actual Value Range: -115~-25
Unit: dBm
Default Value: None
Recommended Value: -97
2D RSCPvalue number of cell proportion
-100dBm 1819 65.27%-103dBm 890 32.89%-95dBm 21 0.72%-10dBm 16 0.59%-97dBm 7 0.24%-90dBm 7 0.23%
-105dBm 1 0.04%-85dBm 1 0.03%
2F RSCPvalue number of cell proportion
-97dBm 1818 65.21%-100dBm 907 33.54%-92dBm 20 0.68%-94dBm 7 0.24%-87dBm 7 0.23%-98dBm 1 0.04%-90dBm 1 0.03%-80dBm 1 0.03%
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 13
Hystfor2D -- Hysteresis for event 2D.
Hystfor2F -- Hysteresis for event 2F.
HystforinterRAT -- Inter-RAT Hysteresis
The parameters for 3G handover to GSM(CS)
GUI Value Range: 0~29
Actual Value Range: 0~14.5, step:0.5
Unit: dB/ dBm
Default Value: None
Recommended Value: 4
GUI Value Range: 0~29
Actual Value Range: 0~14.5, step:0.5
Unit: dB/ dBm
Default Value: None
Recommended Value: 4
GUI Value Range: 0~15
Actual Value Range: 0~7.5, step:0.5
Unit: dB
Default Value: None
Recommended Value: 0
2D Hyst
value number of cell proportion
2dB 2718 99.45%1dB 30 0.55%
0 14 0.00%
2F Hystvalue number of cell proportion2dB 2762 100.00%
HystforinterRATvalue number of cell proportion
0 2760 99.93%2dB 2 0.07%
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 14
TrigTime2D -- Interval time between detection of event 2D and sending of the measurement report.
TrigTime2F -- Interval time between detection of event 2F and sending of the measurement report.
The parameters for 3G handover to GSM(CS)
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
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
• Current netwrok setting(1st Oct): All cell be set to D1280
TRIGTIME 2Dvalue number of cell proportionD320 2716 98.33%D120 37 1.34%D200 7 0.25%D160 2 0.07%
TRIGTIME 2Fvalue number of cell proportion
D1280 2762 100.00%
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 15
TIMETOTRIGFORNONVERIFY
Time delay for triggering handovers to GSM cells with non-verified BSIC.
GUI Value Range: 0~64000, 65535(not perform inter-RAT handovers to non-verified GSM cells)
Actual Value Range: 0~64000, 65535
Unit: ms
Default Value: None; Recommended Value: 0
TIMETOTRIGFORVERIFY
Time delay for triggering handovers to GSM cells with verified BSIC.
GUI Value Range: 0~64000
Actual Value Range: 0~64000
Unit: ms
Default Value: None; Recommended Value: 0 (immediately)
The parameters for 3G handover to GSM(CS)
• Current netwrok setting(1st Oct): All cell be set to 0
• Current netwrok setting(1st Oct): All cell be set to 0
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 16
3G to GSM handover steps (By coverage)
The parameters for 3G handover to GSM(CS)
Step 1
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.
/2HTQ 2d2dUsedUsed
/2HTQ 2fused2fUsed
InterRATCSThd2DEcN0、 InterRATCSThd2FEcNO、 InterRATCSThd2DRSCP、 InterRATCSThd2FRSCP;
HystFor2D、 HystFor2F、 TimeToTrig2D、 TimeToTrig2F• Current netwrok setting(1st Oct):
H2d = 2dB
H2f = 2dB
TimeToTrig2D = 320ms
TimeToTrig2F = 1280ms
2D EC/N0 2F EC/N0
value number of cell proportion value number of
cell proportion
-14 1909 72.42% -12 1909 73.01%-12 823 26.76% -10 823 26.23%-10 30 0.81% -8 30 0.76%
2D RSCP 2F RSCP
value number of cell proportion value number of
cell proportion
-100 1819 65.27% -97 1818 65.21%-103 890 32.89% -100 907 33.54%-95 21 0.72% -92 20 0.68%
-102 16 0.59% -94 7 0.24%-97 7 0.24% -87 7 0.23%-90 7 0.23% -98 1 0.04%
-105 1 0.04% -90 1 0.03%-85 1 0.03% -80 1 0.03%
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 17
3G to GSM handover steps (By coverage)
The parameters for 3G handover to GSM(CS)
Step 2
• Current netwrok setting(1st Oct): TargetRatCsThd= -95dBm
HystforinterRAT= 0 ; TIMETOTRIGFORVERIFY=0
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.
Mother_RAT is the measurement result of the GSM RSSI.
Tother_RAT is the inter-RAT handover decision threshold.(TargetRatCsThd)
CIO is the offset for the cell of another inter-RAT.
H is HystforinterRAT, the setting of which can reduce wrong decisions caused by signal jitters.
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 18
SUMMARY
The parameters for 3G handover to GSM(CS)
For example used the current mainstream configuration, the handover will be executed:
When the Ec/Io of 3G_service_cell < -14 – 2/2 ( Ec/Io< -15dB)or RSCP < -100 – 2/2 ( RSCP < -101dBm
)
2D event was reportCompression Mode Started, start to measurement GSM neighbor cellStart compression timer (60s), If the handover not successful before timeout, stop compression mode
Hold 320ms
zzzzzzzzzzzzzzzzzzzzReport measurement result every 1000ms
If Ec/Io of 3G_service_cell > -12 +2/2(Ec/Io > -11dB) or RSCP > -97 +2/2 (RSCP>-96dBm)
Hold 1280msSTOP compression ModeRESET timer
Mother_RAT>-95dBm +0
Hold 0s
Hand over to GSM
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