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12_OMF000603 Traffic Statistics Analysis
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HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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www.huawei.com
G –Huawei CoBCCH Optimization Proposal
HUAWEI TECHNOLOGIES
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 2
Parameter Configuration and Adjustment Strategies
• Initial Configuration Cell/TRX configuration Open the enhanced concentric cell
• Overview of Common Adjustments Two sets of strategies
Thresholds
AssignmentHandover
Assign optimum levelOL<->UL HO received levelsOL/UL TCH traffic Thrsh
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 3
Parameter Configuration (1)
• Initial Configuration for activing Cell/TRX configuration Open the enhanced concentric cell
Parameter s Recommended Value Location note
Frequency Band GSM900&DCS1800 Add Cell
BCCH IUO Attribute Underlaid Subcell Cell AttributesIn Help Documents is in the Bsic Handover Parameter
ECSC Yes Basic Call Control Parameters
Flag to enable or disable the early classmark sending: that is this flagenables or disables the Multiband Handovers (from GSM900 toDCS1800 and vice versa).
Concentric Circles HO Allowed
Yes Bsic Handover Parameter
The parameter indicates whether a concentric cell handover is allowed.A concentric cell handover is implemented to achieve mass coverage in the underlaid subcell and tight frequency reuse in the overlaid subcell, thus improving the system capability and service performance.A concentric cell handover consists of inward handover and outward handover.
Enhanced Concentric Allowed
Yes Bsic Handover Parameter
This parameter indicates whether the enhanced concentric circle handover is allowed in concentric cell.While the Enhanced Concentric Cell Allowed is set as "Yes", compare the receive level of the MS with OtoU HO Receive Level Threshold and UtoO HO Receive Level Threshold to decide whether to trigger an OtoU HO or a UtoO HO.While the Enhanced Concentric Cell Allowed is set as "No", compare the receive level of the MS with RX_LEV Threshold so as to decide whether to trigger an enhanced concentric cell HO. It is required to consider the load of the UL when deciding whether to trigger a UtoO HO
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 4
Parameter Configuration (2)
• Initial Configuration for Concentric Data
Parameter Recommended Value
Location note
UL to OL HO Allowed Yes Concentric Data
OL to UL HO Allowed Yes Concentric Data
RX_LEV for UO HO Allowed Yes Concentric Data
RX_QUAL for UO HO Allowed No Concentric Data
TA for UO HO Allowed No Concentric DataTA note accurate enough
Assign Optimum LayerSystem
OptimizationConcentric Data
Assign-optimum-level Threshold 40 Concentric Data
Pref. Subcell in HO of Intra-BSC Underlaid Subcell Concentric Data
Incoming-to-BSC HO Optimum Layer Underlaid Subcell Concentric Data
OtoU HO Received Level Threshold 25 Concentric Data
UtoO HO Received Level Threshold 35 Concentric Data
UtoO Traffic HO Allowed Yes Concentric Data UL to OL and OL to UL
En Iuo Out Cell Low Load Thred 20 Concentric DataNeed to be tuned base
on the actual traffic load.
En Iuo Out Cell General OverLoad Thred 85 Concentric Data
En Iuo Out Cell Serious OverLoad Thred 90 Concentric Data
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 5
Implementation & Tuning - Common Parameters and Adjustment Strategies 1
• Assignment Control Parameters
Key Parameter Recommended Value Configuration Description
Assign Optimum Layer
System Optimization*
1. Underlaid Subcell means to assign all calls to the underlaid subcell.2. Overlaid Subcell has a risk of assigning a call beyond the converge of the overlaid subcell.3. System Optimization can achieve a loads balance between the overlaid and underlaid subcells, but needs precise adjustment of the parameters. See the relevant appendix for details.
Assign-optimum-level Threshold
40
1. Valid when Assign Optimum Layer is set to System Optimization, with a default value of -80dBm.2. If this value is changed to 25 or so, more calls will be assigned to the overlaid subcell, but the number of failure in utilizing OL TCH may increase as well.
TA Thrsh. Of Assignment Pref.
63
1. Valid when Assign Optimum Layer is set to System Optimization.2. Generally, CoBCCH cell has a limited coverage scope, that is, the difference between the coverage of overlaid and underlaid subcells does not exceed one or two TAs. Therefore, the error will be large if TA threshold is adopted. The default value is recommended to invalidate this parameter.
* Underlaid Subcell maybe selected for the first phase, for only 1 TRX in overlay in Aden BSC.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 6
Implementation & Tuning - Common Parameters and Adjustment Strategies 1
Symptom of CoBCCH Cell
Assignment Strategy Options
Influence of adjustmentUnderlaid Subcell
Overlaid Subcell
Assign Optimum
Layer
Assign-optimum-
level Threshold
Congested Idle System Optimization
Congestion rate Assignment success rate possibly Handover success rate
Fairly idle Fairly congested
System Optimization
Congestion rate Assignment success rate Handover success ratio
Idle Congested Underlaid subcell －
Congestion rate Assignment success rate Handover success ratio
• Assignment Optimization Strategies
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 7
Implementation & Tuning - Common Parameters and Adjustment Strategies 2
• Handover Control ParametersKey Parameter Recommend
ed Value Configuration Description
Concentric Circles HO Allowed Yes The parameter indicates whether a concentric cell handover is
allowed.
Enhanced Concentric Cell Allowed Yes The parameters provided by the enhanced concentric cell can be
used and configured only when this option is ticked.
Incoming-to-BSC HO Optimum Layer
Underlaid Subcell
1. Underlaid Subcell means to assign all calls to the underlay, with a high rate of success. 2. Overlaid Subcell has a risk of assigning a call beyond the converge of the overlay.
Pref. Subcell in HO of Intra-BSC
Underlaid Subcell
1. Underlaid Subcell means to assign all calls to the underlay , with a high rate of success. 2. Overlaid Subcell has a risk of assigning a call beyond the converge of the overlay.3. System Optimization can achieve a balance between the load on overlay and underlay base on accurate adjustments.
TA for UO HO Allowed NoGenerally, 1800M has a limited coverage scope, that is, the difference between the coverage of the overlaid and underlaid subcells does not exceed 1 or 2 TAs, but the error of TA is big. It is recommended to use the default value to invalidate this parameter
RX_LEV for UO HO Allowed Yes Reception level can serve as a precise handover judgment condition.
RX_QUAL for UO HO Allowed No Reception quality can serve only as an indirect handover judgment condition.
UtoO Traffic HO Allowed Yes This parameter indicates whether the traffic in the underlaid subcell determines the underlaid <> overlaid (UL <> OL) handover.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 8
Implementation & Tuning - Common Parameters and Adjustment Strategies 2
• Handover Strategy Adjustment
Symptom CoBCCH CellStrategy for
Pref. Subcell in HO of Intra-BSC
Influence of adjustmentUnderlaid Subcell
Overlaid Subcell
Congested Idle System Optimization
Congestion rate Assignment success rate possibly Handover success ratio
Idle Congested Underlaid Subcell
Congestion rate Assignment success rate possibly Handover success ratio
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 9
Implementation & Tuning - Common Parameters and Adjustment Strategies 3
• Handover Threshold Parameters
Key Parameter Recommended Value Configuration Description
OtoU HO Received Level Threshold 25
1. It is recommended that the difference between this value and the “UtoO HO Received Level Threshold” not be less than 10dB, so as to avoid Ping-Pong handover between UL and OL.
UtoO HO Received Level Threshold 35
This is one of the parameters that determine the regions of overlaid
and underlaid subcells.
En Iuo Out Cell Low Load Thred 20*
If the ratio of the underlaid subcell channel occupancy is smaller than the value of this parameter, some calls in the overlaid subcell will handover to the underlaid subcell.
En Iuo Out Cell General OverLoad Thred
85If the ratio of the underlaid subcell channel occupancy is greater than the value of this parameter, some calls in the underlaid subcell will handover to the overlaid subcell.
UtoO HO REn Iuo Out Cell Serious OverLoad Thredeceived Level Threshold
90 If the load of underlay is higher than this value, the handover from underlaid subcell to the overlaid subcell will speed up.
* At the beginning, the overlay in Aden BSC only 1 TRX, but underlay is with 3 or 4 TRX, so this threshold can be more higher.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 10
Implementation & Tuning - Common Parameters and Adjustment Strategies 3
• Handover Threshold Adjustment
Symptom of CoBCCH Cell Assignment Threshold Adjustment
Modification InfluenceUnderlaid Subcell
Overlaid Subcell Handover
UtoO HO Received Level Threshold
OtoU HO Received Level Threshold
Congested Idle － Congestion rate Handover
success rate Call drop rate
－ －
There are few OL -> UL handovers, but many losses of cell RF signal in overlay.
－ Congestion rate Handover success rate Call drop rate
－ Congested
The rate of success of UL -> OL handover is low.
－ Congestion rate Handover success rate Call drop rate
Idle Congested － Congestion rate Handover success rate Call drop rate
－ －The rate of OL <-> UL handover are low.
Congestion rate Handover success rate Call drop rate
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 11
Appendix 1: IUO Handover Judgment Flow
• IUO HO Judgment – U to O To avoid UL congestion and maximize handover efficiency, only level-
based handover is recommended. The actual effect of load handover is: to keep maximum traffic on UL in
non-busy hours.
DL Rx-Lev >= U to O HO received level Thrsh.
DL Rx-Qual < Receiving Quality Thrsh.
TA < (TA Thrsh. - TA Hysteresis)
Traffic in Underlay > Traffic Thrsh. of underlay
AND
HO will be performed from U to O
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 12
Appendix 1: IUO Handover Judgment Flow
• IUO HO Judgment – O to U Usually we think the Underlay is with the better signal.
DL Rx-Lev < O to U HO received level Thrsh.
DL Rx-Qual >= Receiving Quality Thrsh.
TA > (TA Thrsh. + TA Hysteresis)
OR
HO will be performed from O to U.
Service cell is top rank cell ?
HO will be performed from O to other cell.
Y N
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 13
Appendix 2: Implementation & Tuning – Overview of CoBCCH Traffic Statistics
1).Measurement of MRs upon Handover Initiation per Cell AS330A:CELL_HO_UL_LEV_OLCELL_ULCELL_AVGAS332A:CELL_HO_DL_LEV_OLCELL_ULCELL_AVGAS330B:CELL_HO_UL_LEV_OLCELL_ULCELL_AVGAS332B:CELL_HO_DL_LEV_OLCELL_ULCELL_AVGAS334A:CELL_HO_TA_OLCELL_ULCELL_AVGAS334B:CELL_HO_TA_OLCELL_ULCELL_AVG
2).Intra-Cell Handover MeasurementH3002:CELL_INTRACELL_HO_REQ_ULCELL_OLCELLH3001:CELL_INTRACELL_HO_REQ_OLCELL_ULCELLH3012:CELL_INTRACELL_HO_CMD_ULCELL_OLCELLH3011:CELL_INTRACELL_HO_CMD_OLCELL_ULCELLH3022A:CELL_INTRACELL_HO_FAIL_CONG_ULCELL_OLCELLH3021A:CELL_INTRACELL_HO_FAIL_CONG_OLCELL_ULCELLH3022M:CELL_INTRACELL_HO_FAIL_OTHERS_ULCELL_OLCELLH3021M:CELL_INTRACELL_HO_FAIL_OTHERS_OLCELL_ULCELLTH3032:CELL_INTRACELL_HO_SUCC_RATE_ULCELL_OLCELLTH3031:CELL_INTRACELL_HO_SUCC_RATE_OLCELL_ULCELL
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
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The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 14
3).Number of MRs per CellS3012:CELL_SIG_CH_MR_NUM_ULCELLS3011:CELL_SIG_CH_MR_NUM_OLCELLS3002:CELL_TRAF_CH_MR_NUM_ULCELLS3001:CELL_TRAF_CH_MR_NUM_OLCELLCR3557:CELL_TRAF_CH_TRAF_ULCELLCR3558:CELL_TRAF_CH_TRAF_OLCELL
4).Channel Assignment Concentric Cell Measurement per CellR3200:CELL_CH_ALLOC_REQ_TIMES_ONLY_ULCELLR3201:CELL_CH_ALLOC_REQ_TIMES_ONLY_OLCELLR3202:CELL_CH_ALLOC_REQ_TIMES_PREF_ULCELLR3203:CELL_CH_ALLOC_REQ_TIMES_PREF_OLCELLR3202B:CELL_ASS_TRAF_CH_ALLOC_REQ_TIMES_PREF_ULCELLR3203B:CELL_ASS_TRAF_CH_ALLOC_REQ_TIMES_PREF_OLCELLR3202D:CELL_INTRABSC_INCELL_HO_CH_ALLOC_REQ_TIMES_TCH_PREF_ULCELLR3203D:CELL_INTRABSC_INCELL_HO_CH_ALLOC_REQ_TIMES_TCH_PREF_OLCELLR3202E:CELL_INTERBSC_INCELL_HO_CH_ALLOC_REQ_TIMES_TCH_PREF_ULCELLR3203E:CELL_INTERBSC_INCELL_HO_CH_ALLOC_REQ_TIMES_TCH_PREF_OLCELL
Appendix 2: Implementation & Tuning – Overview of CoBCCH Traffic Statistics
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Top right corner for field-mark, customer or partner logotypes.
----------------
The following nine groups of colors are an example of how our design colors can be used, please take note that you should only use one design color group per slide. For specific usage details, refer to the “Typesetting Standard”.
Page 15
4).Channel Assignment Concentric Cell Measurement per CellR3222B:CELL_ASS_CH_OVERFLOW_TIMES_TCH_PREF_ULCELLR3223B:CELL_ASS_CH_OVERFLOW_TIMES_TCH_PREF_OLCELLR3222D:CELL_INTRABSC_INCELL_HO_CH_OVERFLOW_TIMES_TCH_PREF_ULCELLR3223D:CELL_INTRABSC_INCELL_HO_CH_OVERFLOW_TIMES_TCH_PREF_OLCELLR3222E:CELL_INTERBSC_INCELL_HO_CH_OVERFLOW_TIMES_TCH_PREF_ULCELLR3223E:CELL_INTERBSC_INCELL_HO_CH_OVERFLOW_TIMES_TCH_PREF_OLCELLR3225J:CELL_CH_OVERFLOW_TIMES_ULCELL_TRAF_CHR3224J:CELL_CH_OVERFLOW_TIMES_OLCELL_TRAF_CHR3225G:CELL_CH_OVERFLOW_TIMES_ULCELL_SIG_CHR3224G:CELL_CH_OVERFLOW_TIMES_OLCELL_SIG_CHR3225H:CELL_CH_OVERFLOW_TIMES_ULCELL_FRR3224H:CELL_CH_OVERFLOW_TIMES_OLCELL_FRR3225I:CELL_CH_OVERFLOW_TIMES_ULCELL_HRR3224I:CELL_CH_OVERFLOW_TIMES_OLCELL_HRR3224K:CELL_ULCELL_TO_OLCELL_HO_OLCELL_OVERFLOW_TIMESR3225K:CELL_OLCELL_TO_ULCELL_HO_ULCELL_OVERFLOW_TIMES
Appendix 2: Implementation & Tuning – Overview of CoBCCH Traffic Statistics
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