Principle and Implementation of IBCA.ppt

8/10/2019 Principle and Implementation of IBCA.ppt

http://slidepdf.com/reader/full/principle-and-implementation-of-ibcappt 1/24

Huawei Confidential

shari

Channel Allocation Based on

Interference (IBCA)

www.huawei.co



Huawei Confidential

IBCA Principle

IBCA Implementation



Huawei Confidential

• IBCA Overview

• IBCA Estimation Process• IBCA Example

• Test Result of IBCA Capacity Gain



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.



Huawei Confidential

• IBCA Overview

•IBCA Estimation Process

• IBCA Example

• Test Result of IBCA Capacity Gain



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.


http://slidepdf.com/reader/full/principle-and-implementation-of-ibcappt 7/24Huawei Confidential

IBCA OverviewIBCA Estimation ProcessIBCA ExampleTest Result of IBCA Capacity Gain


http://slidepdf.com/reader/full/principle-and-implementation-of-ibcappt 8/24Huawei Confidential

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.



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



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…………………..



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



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





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



Huawei Confidential

IBCA Principle

IBCA Implementation



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



Huawei Confidential

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



Huawei Confidential

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



Huawei Confidential

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



Huawei Confidential

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]



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



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



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



Huawei Confidential

Thank You !

www.huawei.com

Documents

Principle and Implementation of IBCA.ppt