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Huawei Parameter Strategy
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Traffic Share Solution Idle Mode & Call Control Handover 2G/3G Interoperability Power Control www.huawei.com HUAWEI TECHNOLOGIES CO., LTD.
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Traffic Share Solution • Recommended solutions for Traffic Balancing I. In case of GSM900 and DCS1800 co-location, the GSM900 has strong signal strength but we can use the idle parameter setting and handover to control the traffic and achieve the balanced traffic between GSM900 and DCS1800 II. In case of 2G and 3G co-location, we can use the idle parameter setting and handover to control the traffic and achieve the balanced traffic between 2G and 3G a. Set proper cell selection and reselection parameters b. Utilize proper cell layer settings and other handover parameters c. Control idle mode MS behavior, optimize handover settings to achieve proper traffic load sharing d. other
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Traffic Share Solution
Hierarchical strategy for GSM900 and GSM1800
The layer of GSM 1800 cell is higher than the 【 Inter-layer HO threshold 】 +64- 【 Inter-layer HO hysteresis 】 layer of GSM 900 cell. O 【 Edge HO dH a Threshold 】/Lo HO e dg ③E
Cell A GSM 1800
The MS in this zone are difficult to be triggered handover from GSM 1800 cell to GSM 900 cell.
②La
Cell B GSM 900 yer HO
ct/ e l e t ll s e le c e ①C ll res ce
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① In idle mode, the MS stay in the GSM 900 cell B by setting the cell selecting or cell reselecting parameters. ② When the DL signal level is good enough to reach the threshold, the MS is triggered the Layer HO to GSM 1800 cell B. ③-1 Because the moving of Ms, the UL/DL signal level become worse. When UL/DL RxLevel is lower than the threshold, the MS is triggered Edge HO to GSM 900 cell B. ③-2 In oder to avoiding congestion of GSM 1800 cell, the Load HO can be used to share some traffic to GSM 900 cell.
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Traffic Share Solution • Strategy for 2G/3G Interoperability For the areas covered by both the GSM network and the UMTS network,2G/3G interoperability can be performed to achieve traffic balance between the GSM and UMTS. I.Only suggest to active the cell reselection from 2G to 3G. II.Both cell reselection and handover are suggested from 3G to 2G. ①Cell reselection from 3G to 2G only when the UE leave 3G coverage. ②UE will trigger cell reselection from 2G to 3G once it go back to 3G coverage. ① ②
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2G Coverage 3G/2G Coverage
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Traffic Share Solution Idle Mode & Call Control Handover 2G/3G Interoperability Power Control www.huawei.com HUAWEI TECHNOLOGIES CO., LTD.
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Idle Mode • Strategy: More subscribers stay in DCS in Idle mode Layer Priority: ID=OD>MD>MG GSM900 Cell
GSM 900
GSM 900
GSM1800 GSM1800 Cell
GSM1800
Micro Cell In-Building Cell
GSM1800 GSM1800
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GSM 900
GSM1800
GSM1800 GSM1800
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Layer 3
Layer 2
Layer 1
Idle Mode & Call Control • Parameter suggested PARAMETER Abbreviated Name
MAX TA(bit period(1 bit=0.55km))
PROPOSED VALUES Parameter Name
Actual distance between MS & BTS
MG
62
MD
ID
OD
2
4
33
Repeater site value TBD
Repeater site value TBD
15 (follow existing value)
15 (follow existing value)
20
28
36
28
RXLEV_ACCESS_MIN
RxLevel Acces Min
Radio Link Timeout (FR & EFR)
RLT
Rural,5 Suburban 5 Others 8 (follow existing value) 32
Radio Link Timeout (AMR FR)
AFRDSBLCNT
48
48
48
48
Layer of the Cell
Layer of the Cell
3
2
1
1
Cell Priority
Cell Priority
1
1
1
1
CRO
Cell Reselection Offset
0 (0dB)
12 (24dB)
18(36dB)
15 (30dB)
TO
Temporary Offset
0 (0dB)
0 (0dB)
4 (40dB)
4 (40dB)
PT
Penalty Time
0 (20 second)
0 (20 second)
CRH
Cell Reselection Hysteresis
14 dB
14 dB
14 dB
14 dB
BS_AG_BLKS_RES
Number of CCCH blocks reserved for the AGCH
1
1
1
1
BS-PA-MFRAMS
Number of multi-frames in a cycle on the paging channel
FMSMAXOPCC
MS_TXPWR_MAX_CCH
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1 (40 second) 0 (20 second)
2 Multiframe 2 Multiframe 2 Multiframe 2 Multiframe Period Period Period Period 5
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0
0
0
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Traffic Share Solution Idle Mode & Call Control Handover 2G/3G Interoperability Power Control www.huawei.com HUAWEI TECHNOLOGIES CO., LTD.
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Handover •
Huawei handover algorithm introduction MS Goes into Dedicated Mode
1
Measurement Report processing
Penalty Processing Ranking Processing
2
3
Handover Judgment
Handover Implementation if necessary MS Goes into New Dedicated Mode
Emergency HO
Normal HO Edge HO
No DL MR HO
Layer HO
TA HO
PBGT HO
Interference HO
AMR HO
Bad Quality HO
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Load HO
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Handover • Edge Handover Handover Triggering
RX_Lev
P: Watch Time (s) N: Valid Time (s)
RX_LEV Thr
P/N
Serving Cell
Time
Neighboring Cell
UL/DL Edge HO is triggered when: Serving cell: Rxlev < Edge HO Threshold following P/N rules Neighboring cells following P/N rules with: 16 bits values lower than serving cell DL_Rx_Lev(n)> DL_Rx_Lev(s)+[Inter-cell HO Hysteresis](s->n) Candidate cell exists and available HUAWEI TECHNOLOGIES CO., LTD.
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Handover • Layer Handover
Layer HO is triggered when: Neighboring cells following P/N rules with: 16 bits values lower than serving cell RX_LEV (n)>= [Inter-layer HO threshold] (n) + [Inter-layer HO hysteresis] (s->n) Layer & level (n)
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Handover • PBGT Handover Handover Triggering
Path Loss (dB)
P: Watch Time N: Valid Time
PBGT 5 HO Threshold
P/N
Time
126119dB 126dB119=7dB>5dB Serving Cell
Neighboring Cell
PBGT HO is triggered when: Path loss (s) – Path loss (n) > PBGT HO Margin (s->n) and 16bits(n) < 16bits (s) following P/N rules Layer & level (n) = Layer & level (s) Candidate cell exists and available HUAWEI TECHNOLOGIES CO., LTD.
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Handover • Parameter suggested PARAMETER
Abbreviated Name
PROPOSED VALUES
Parameter Name
MG
MD
ID
OD
Edge HO UL RX_LEV Threshold Edge HO uplink RX Level threshold
-98 dBm
-94 dBm
-94 dBm
-94 dBm
Edge HO DL RX_LEV Threshold Edge HO downlink RX Level threshold
-94 dBm
-90 dBm
-90 dBm
-90 dBm
Inter-layer HO Threshold
Inter-layer HO Threshold
-75 dBm
-85 dBm
-85 dBm
-85 dBm
Inter-layer HO Hysteresis
Inter-layer HO Hysteresis
2dB
2dB
2dB
2dB
PBGTMARGIN
PBGT HO Margin
68
68
68
68
DLQUALIMIT
DL Qual. Threshold
60
60
60
60
ULQUALIMIT
UL Qual. Threshold
55
55
55
55
TALIMIT
TA Threshold
62
33
2
4
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Traffic Share Solution Idle Mode & Call Control Handover 2G/3G Interoperability Power Control www.huawei.com HUAWEI TECHNOLOGIES CO., LTD.
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2G/3G Interoperability
Cell Reselection Flow(2G->3G) Start Inter-RAT Cell Reselection Enable=Yes RLA_C>level threshold for searching 3G cell
1 .RSCP > RLA_C+ FDD_Q_offset 2. Ec/NO > FDD_Q_min – FDD_Qmin_Offset Ec/No>FDD_Qmin &last more than 5s 3. RSCP > FDD_RSCP_MIN Above conditions are met for five consecutive seconds End
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2G/3G Interoperability • Parameter suggested PARAMETER Abbreviated Name
Parameter Name
PROPOSED VALUES
INTERRATOUTBSCHOEN
Inter-RAT Out BSC Handover Enable
No
INTERRATCELLRESELEN
Inter-RAT Cell Reselection Enable
Yes
INTERRATINBSCHOEN
Inter-RAT In BSC Handover Enable
Yes
CELLSELECTAFTERCALLREL Select 3G Cell After Call Release
Yes 0 (always select a cell if acceptable) 7 (-12 dB)
FDDQOFF
FDD Q Offset
FDDQMIN
FDD Qmin
FDDQMINOFFSET
FDD Qmin Offset
0 (0 dB)
FDDRSCPMIN
FDD RSCP Min.
-102 dBm
QI
Qsearch I
7 (always)
QP
QsearchP
7 (always)
QCI
Qsearch C Initial
QSEARCHC
Qsearch C
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Use_Qsearch_I 7 (always)
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2G/3G Interoperability •2G to 3G handover only activate in some spots PARAMETER Abbreviated Name
Parameter Name
PROPOSED VALUES
INTERRATOUTBSCHOEN
Inter-RAT Out BSC Handover Enable
Yes
BET3GHOEN
Better 3G Cell HO Allowed
Yes
HOOPTSEL
Inter-rat Ho Preference
HOPRETH2G
HO Preference Threshold for 2G Cell
-85 dBm
HORSCPTH3G
RSCP Threshold for Better 3G Cell HO
-75 dBm
HOECNOTH3G
Ec/no Threshold for Better 3g Cell HO
-7 dB
MINRSCPTHRES
Min RSCP threshold
-90 dBm
MINECNOTHRES
Min Ec/No threshold
- 9.5 dB
HOSTAT3G
3G Better Cell HO Watch Time
5 seconds
HODURT3G
3G Better Cell HO Valid Time
4 seconds
QCI
Qsearch C Initial
QSEARCHC
Qsearch C
FDDREP
FDD REP QUANT
Pre_3G_Cell
Use_Qsearch_I 7 (always) Dense Urban & Urban: Ec/No Suburban & Rural: RSCP
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Traffic Share Solution Idle Mode & Call Control Handover 2G/3G Interoperability Power Control www.huawei.com HUAWEI TECHNOLOGIES CO., LTD.
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Power Control • Huawei III Power Control Step Calculation: step1(k)= -1* (SF1*(ca_filtered(k)-STarget)+QF1*( qa_filtered(k)-QTarget)) step2(k)= -1* (SF2*(ca_filtered(k)- STarget)+QF2*( qa_filtered(k)-QTarget)) step(k)=max(step1(k) , step2(k) ) SF1: Rx Level Adjust Factor QF1: Rx Qual Adjust Factor SF2: Rx Level Protect Factor QF2: Rx Qual Protect Factor STarget =(SThrUp+ SThrDown)/2 QTarget =(QThrUp+ QThrDown)/2
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Power Control • Parameter suggested Parameter Name (UL)
PROPOSED VALUES
Parameter Name (DL)
PROPOSED VALUES
ULRexLevHighThred
18 (Rxlev > -92dBm)
DLRexLevHighThred
25 (Rxlev > -85dBm)
ULRexLevLowThred
18 (Rxlev < -92dBm)
DLRexLevLowthred
25 (Rxlev < -85dBm)
ULFSRexQualHighThred
16 (C/I >16dB)
DLFSRexQualHighThred
16 (C/I >16dB)
ULFSRexQualLowThred
16 (C/I <16dB)
DLFSRexQualLowThred
16 (C/I <16dB)
ULHSRexQualHighThred
18 (C/I >18dB)
DLHSRexQualHighThred
18 (C/I >18dB)
ULHSRexQualLowThred
18 (C/I <18dB)
DLHSRexQualLowThred
18 (C/I <18dB)
ULAFSRexQualHighThred
14 (C/I >14dB)
DLAFSRexQualHighThred
14 (C/I >14dB)
ULAFSRexQualLowThred
14 (C/I <14dB)
DLAFSRexQualLowThred
14 (C/I <14dB)
ULAHSRexQualHighThred
16 (C/I >16dB)
DLAHSRexQualHighThred
16 (C/I >16dB)
ULAHSRexQualLowThred
16 (C/I <16dB)
DLAHSRexQualLowThred
16 (C/I <16dB)
ULMAXDOWNSTEP
6 dB
DLMAXDOWNSTEP
4 dB
ULMAXUPSTEP
8 dB
DLMAXUPSTEP
8 dB
ULREXLEVADJFCTR
3
DLREXLEVADJFCTR
3
ULREXQUALADJFCTR
4
DLREXQUALADJFCTR
4
DLRXLEVPROTECTFACTOR
10
ULRXLEVPROTECTFACTOR
10
DLRXQUALPROTECTFACTOR
60
ULRXQUALPROTECTFACTOR
60
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