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8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
shari
Channel Allocation Based on
Interference (IBCA)
www.huawei.co
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
IBCA Principle
IBCA Implementation
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
• IBCA Overview
• IBCA Estimation Process• IBCA Example
• Test Result of IBCA Capacity Gain
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
IBCA Overview
IBCAEstimating the CIR(C/I) of each available channel based on interference
measurement;
Select a channel of best CIR for newly establishing call to guarantee
good quality;
Pre-requirement:synchronization at air interface
IBCA is used for a new channel be allocated.
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
• IBCA Overview
•IBCA Estimation Process
• IBCA Example
• Test Result of IBCA Capacity Gain
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
IBCA Estimation Process
main implementation process of IBCA
Finding available channels(slots) in the service cell;Finding all interference MSs from IBCA neighbor cell;
Calculating CIR of each available{TS, MAIO}
main sub process of CIR calculation
Path loss estimation
Interference signal estimation
CIR calculation;
Selecting MAIO of best CIR (Minimal interference)
IBCA estimation process of uplink and downlink is similar.
8/10/2019 Principle and Implementation of IBCA.ppt
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IBCA OverviewIBCA Estimation ProcessIBCA ExampleTest Result of IBCA Capacity Gain
8/10/2019 Principle and Implementation of IBCA.ppt
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Example: step1 Find available slots
TRX
T i m e sl o
t
(0,20)
Service cell A
0
1
23
4
5
67
0 1
(2,16 )
(1,18)
(0,18)
\
(4,30)
(2,20)
(1,12)
(2,23)
(1,3)
\
(2,14)
(4,20)
(0,3)
(0,17)
(0,15)
(MAIO,CIR)
Step1:Find available slots!TS0 and TS6 is available.
MA={668, 669, 670, 671, 672,673}MAIO={0,1,2,3,4,5}
Take TS0 for example in following PPT.
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
TRX
T i m
e sl o
t
(0,20)
Service cell
0
1
2
3
4
5
67
0 1
(2,16)
(1,18)
(0,18)
\
(4,30)
(3,20)
(1,12)
(2,23)
(1,13)
\
(2,14)
(4,20)
(3,20)
(0,17)
(0,15)
TRX
T i m e
sl o
t
(1,18)
IBCA NC A
0
1
2
3
4
5
67
0 1
(0,15)
\
(2,18)
(4,21)
(2,12)
\
\
(1,23)
\
(1,16)
(1,23)
(0,33)
(2,19)
(2,31)
\
Newcall
.....…..
IBCA NC …..
old
call
This channel is only interfered bythe same TS
Example: Step 2 Find interference MSs
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
Example : step3 Calculating CIR
Available MAIO of Slot 0:MAIO=0, CIR = - ∞ MAIO=1, CIR = ?MAIO=2, CIR = ?MAIO=3, CIR = ?
MAIO=4, CIR = ?MAIO=5, CIR = ?
Take {TS=0,MAIO=3}for example.MR
Severing Cell:-75dBm
Ncell1(IBCA NC A):-85dBm
Ncell2:-80dBm…………………..
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Huawei Confidential
Example : step3-1 Pathloss Estimation
PathLoss (dB) = TRX_PWR_BCCH(dBm) - RxLevDL BCCH (dBm)
TRX_PWR_BCCH: Transmission power of BCCH TRX;
RxLevDLBCCH : Signal strength of BCCH TRX measured by MS
SCELL IBCA NC ANew Call Old Call
BS_PWR BBS_PWR A
RxLevDL B(-85dBm) RxLevDL A(-90dBm)
Pathloss(B->A)= 46dBm - (-85dBm) = 131dB
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Huawei Confidential
Example : step3-2 Interference Estimation
SS_INTF: interference signal strength
BS_PWR: interference BS transmission power, have considered the
power control reduction
PathLoss: Pathloss between current MS and interfering BTS
IntfType: 0dB if co-channel interference, or 18dB if adjacent
interference
IntfTypedB PathLossdBm PWR BS dBm INTF SS
)()( _ )( _
SS_INTF_DL(dBm) = (46dBm - PC level *2) - 131dB – 18dB=46dBm – 1*2 – 131dB -18dB = -105dBm
8/10/2019 Principle and Implementation of IBCA.ppt
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8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
Example : step4 Selecting MAIO of best CIR
Caculate CIR of all {TS,MAIO}
Slot 0:MAIO=0, CIR = - ∞ MAIO=1, CIR = 20MAIO=2, CIR = 18MAIO=3, CIR = 30MAIO=4, CIR = 15MAIO=5, CIR = 22
Slot 6:MAIO=0, CIR = - ∞ MAIO=1, CIR = 22MAIO=2, CIR = 18MAIO=3, CIR = 20MAIO=4, CIR = 15MAIO=5, CIR = 20
TRX
T i m
e sl o
t
(0,20)
Service cell
0
1
2
3
4
56
7
0 1
(2,16)
(1,18)
(0,18)
\
(4,30)
(3,20)
(2,12)
(2,23)
(1,3)
\
(2,14)
(0,20)
(3,30)
(0,17)
(0,15)
MAIO=3, CIR = 30
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Huawei Confidential
IBCA Principle
IBCA Implementation
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
Main parameters of IBCA
index Name Description Value
1 IBCA Allowed IBCA switch Yes
2 IBCA ICDM Switch Whether to open ICDM Yes
3 IBCA Dynamic Measure
Neighbor Cell Allowed
Dynamic Measure Switch Yes
4 IBCA Neighbor Cell Flag Set IBCA Neighbor Cell Flag to Yes if the neighbor cellshave Co-Channel or Adjacent Channel interference.
Yes
5 IBCA Dynamic Measure
Flag
Set IBCA Dynamic Measure Flag to Yes if IBCADynamic Measure Neighbor Cell is Allowed.
Yes
6 IBCA Neighbor Cell
Group
The IBCA cell Group is used for ICDM to memorize the
path loss of each location in the service cell.
Yes
8/10/2019 Principle and Implementation of IBCA.ppt
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Step 1 - Configure HSN of Cell
HSN set equal to 0.
If HSN is not equal to 0,
the Collision
probability is random.
When HSN is 0, the
probability is fixed,
then we can choose a
slot with minimum
interference.
Set Cell Properties > Frequency Hopping > Configure MA Group
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Step 2 - Configure IBCA Parameter
Turn on the IBCASwitch in Channel
Management
Advanced parameters.
Set cell attributes -> Channel Management-> Set Channel Parameters -> advanced -
> HW II Channel Assignment and Radio Resource Control
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Step 3 - Configure IBCA Neighbor cell
Set IBCA NeighborCell Flag to Yes if theneighbor cells haveCo-Channel orAdjacent Channelinterference.
The interference willbe calculated toallocate the channel.
Set IBCA DynamicMeasure Flag to Yes
if IBCA DynamicMeasure NeighborCell is Allowed.
How to Configure IBCA Neighbor cell Go to next slide
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Step 3 - Principle of Configuring IBCA NeighborCell
The following cells are configured as IBCA Neighbor cell.
Co-frequency interference neighbor cells of first layer BTS
[Primary]
Adj-frequency interference neighbor cells of Same BTS
[Secondary]
8/10/2019 Principle and Implementation of IBCA.ppt
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Huawei Confidential
BTS Name Cell Name
Kalindi CHSL MB6MMBAI0473G@1
Fortune Plaza MB_TURBE_384@1
City Mall MB6MMBAI0440G_10
@1Ram Laxman MB_TURBE_175_10@1
Shiv Center MB_TURBE_546_10@1
CentralFacility Bldg
MB_TURBE_496@2
CentralFacility Bldg
MB_TURBE_496@3
IBCA neighbor cell list
Step 3 - Example: Configuring IBCA Neighbor Cell
Service cell: MB_TURBE_496@1
Co-interference cell Adj-inference cell of same BTS
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Huawei Confidential
Step 4 - IBCA Neighbor Cell Group
The IBCA cell Group is
used for ICDM to
memorize the path loss of
each location in the
service cell.
If we couldn’t get the path
loss through the
measurement report, then
the history path loss from
ICDM matrix can be used.
Set Adjacent cells Set IBCA Cell Group
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Huawei Confidential
Step 4 - Principle of IBCA Neighbor Cell Group
Central FacilityBldg
MB_TURBE_496@3 Shiv Center MB_TURBE_546_10@2
Shiv Center MB_TURBE_546_10@2
Kalindi CHSL MB6MMBAI0473G@3
Kalindi CHSL MB6MMBAI0473G@3 Kalindi CHSL MB6MMBAI0473G@2
Kalindi CHSL MB6MMBAI0473G@2 Fortune Plaza MB_TURBE_384@3
Fortune Plaza MB_TURBE_384@3 Central FacilityBldg
MB_TURBE_496@2
Central FacilityBldg
MB_TURBE_496@2 Central FacilityBldg
MB_TURBE_496@3
Principle: Pare two adjacent neighborcell in One layer of service cell.
neighbor cell in One layer
IBCA neighbor cell Group list of MB_TURBE_496@1
Service cell
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Thank You !
www.huawei.com