s07 3g rpls2_v2-0 gsm measurement
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8/13/2019 S07 3G RPLS2_v2-0 GSM Measurement
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1 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
GSM Measurementsfor Inter-RAT
Cell Reselection Handover
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8/13/2019 S07 3G RPLS2_v2-0 GSM Measurement
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2 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Cell Reselection and Handover
Cell Reselection HandoverDone by MS in the (circuit switched) idle mode, and packet idle and packet transfer modeGSM cell re-selection to WCDMA may differ between non-GPRS capable mobiles, GPRS capable mobiles, and GPRS capable mobile with Packet BCCHCell reselection to weaker WCDMA cells is possible
Handover from GSM is supported if the load of theserving GSM cell is above certain threshold and themeasured quality (CPICH Ec/No) from adjacentWCDMA cell is above a minimum value.Different load threshold for speech calls and Non-Transparent (CS) Data can be set.
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3 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Load Reason Algorithm in RAN 1.5Speech calls can be served adequately both in GSM and UMTS. Consequently, only in a high load situations, multiple RAT phones are
handed over from GSM to UMTS. The number of occupied traffic channels on the available transmission resources triggers the handovdecision in the BSC.
Circuit switched data calls may not surpass a capacity threshold before the BSC imitates the HO procedure.GPRS MS can be directly pushed to 3GPP cell reselection.
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4 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Load Reason Algorithm in RAN 1.5
100%
80%
0%
Service based handoversfor non-transparentdata to provide maximumuser bit rates
Load reasonhandoversfor speech
Load of GSM cell (Occupation of TCHs in TRXes)
Data to WCDMAregardless of GSM load
Speech to WCDMAonly with high GSM load
Higher bit ratesfor data users
More capacity for speech
Packet BCCH parameters can be usedto push GPRS mobiles to WCDMA
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5/125 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Cell Reselection Algorithm from GSM to FDD-WCDMA (cs)
WCDMA measurements, when:
RLA_C Qsearch_I (Non GPRS)
If, for suitable UMTS cell& for a period of 5 s:
CPICH RSCP > RLA_C + FDD_Qoffset
CPICH Ec/No FDD_Qmin
no priorities
between WCDMAneighbours
Measurement Updates: RLC_C value of the serving cell at least 6 strongest non serving GSM cells
at least every 5 s
check
and WCDMA cell
reselection
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6/126 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Example: cs Cell-Reselection to a Stronger WCDMA Cell
Qsearch_I (e.g. 98 dBm)
5 seconds
Cellreselection
time
FDD_Qoffset(e.g. 8 dB)
Start WCDMA
measurements
ServingGSM cell
Non servingneighbourGSM cell
Suitable neighbour
WCDMA cell
CPICH Ec/No
FDD_Qmin
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7/127 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Example: ps Cell-Reselection to a Weaker WCDMA Cell
time
Qsearch_P (e.g. 70 dBm)
Start WCDMAmeasurements
FDD_GPRS_Qoffset(e.g. -8 dB)
CellreselectionCPICH Ec/No
FDD_Qmin
5 seconds
ServingGSM cell
Non servingneighbour
GSM cell
Suitable neighbourWCDMA cell
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8/128 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Cell Reselection Parameters
ParameterParameter forNON GPRS
Qsearch_X Qsearch_I
FDD_Qoffset FDD_Qoffset
RLA_X RLA_C
Parameter forGPRS
Parameter forPBCCH GPRS
Qsearch_P Qsearch_P
FDD_Qoffset FDD_GPRS_Qoffset
RLA_P RLA_P
0
-98
8
-78
1 2
-94 -90
9 10
-74 -70
3
-86
11
-66
4
-82
12
-62
5
-78
13
-58
6 7
-74 Always
14 15
-54 Never
R_Below
dBm
R_Upper
dBm
0
Always
8
0
1 2
-28 -24
9 10
4 8
3
-20
11
12
4
-16
12
16
5
-12
13
20
6 7
-8 -4
14 15
24 28
Range
dB
Range
dB
0
-20
1 2
-19 -18
3
-17
4
-16
5
-15
6 7
-14 -13
Range
dB
Parameter
Name forSys Info (SI)
Qsearch_I
2quater
Qsearch_P Qsearch_P
2quater 3quater
FDD_QMin
2ter
FDD_(GPRS)Qoffset
2quater
FDD_REP_QUANT
2ter
3G_search_PRIO
2(3)quarter(PBCCH)
FDD_Qmin
Qsearch_I & Qsearch_P
FDD_Qoffset & FDD_GPRS_Offset
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9 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Handover Process incl. RAN 1.5
Handover Triggering Thresholds set in BSC
Inter-RAT measurements when:The RXLEV of the serving cell is above or
below the given thresholdQsearch_C
Handover Decision is done in case of Load of the serving cell >Load_Threshold and CPICH Ec/No> min Ec/No Threshold
MS reports best UTRAN cell basedon measurement results
Handover command is send to MSC
Latest after 5 s(one WCDMA band)
However in S10.5 MS is measuring the UTRAN cellscontinuously if they are defined as a neighbour,measurements are done during idle periods
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10 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
Example: Handover to a Weaker WCDMA Cell
Qsearch_C
Serving GSM cell
Non servingneighbourGSM cell
Suitable neighbourWCDMA cell
FDD_Qoffset(< 0)
5 seconds
Cellreselection
CPICH Ec/NoFDD_Qmin
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11 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
GSM ISHO in RAN1.5: Example
Load Threshold for Speech Calls inter-RAT Handover LOAD_THRESHOLD_FOR_SC_IS_HO= 80%
Min Ec/No threshold for a handover to the UTRAN adjacent cell MIN_ECNO_THRSHOLD = -15 dB
Qsearch_c = 15 (if Qsearch_c = 15, the mobile is not allowed to measure UTRAN adjacent cells and
therefore the BSS does not send the Measurement Information message to the mobile at all)1 Load of the serving cell = 45% and the measured Ec/No = - 20 dB
--> Handover to the UTRAN not possible due to low load and low Ec/No
2 Load of the serving cell = 45% and the measured Ec/No = - 10 dB--> Handover to the UTRAN not possible due to low load
3 Load of the serving cell = 95% and the measured Ec/No = -10 dB--> Handover to the UTRAN possible
Handover example (speech/Transparent data)-
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12 NOKIA topic: GSM Measurements for Inter-RAT Cell Reselection & Handover/ July 2003 /Markus Wimmer
GSM ISHO in RAN1.5: Example
Handover example (Non Transparent data)-
Load Threshold for Non-Transparent Data inter-RAT Handover
LOAD_THRESHOLD_FOR_NON_TPC_IS_HO =0% (default)
Min Ec/No threshold for a handover to the UTRAN adjacent cell
MIN_ECNO_THRSHOLD= -15 dB
Qsearch_c = 15 (if Qsearch_c = 15, the mobile is not allowed to measure UTRAN adjacent cells andtherefore the BSS does not send the Measurement Information message to the mobile at all)
1 Load of the serving cell = 0% and the measured Ec/No = - 20 dB--> Handover to the UTRAN not possible due to low Ec/No
2 Load of the serving cell =0% and the measured Ec/No = - 10 dB--> Handover to the UTRAN possible
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