IBS Strategy

VMS Project

Selection the IBS carriers

• Purpose: Selection IBS carrier for 2nd layering

• Currently, VMS under using IBS in F3 (10612), this solution is very good due to use separate frequency with other sites, so the less interference.

• In order to increasing capacity for IBS, upgrade to 2nd carrier for all IBS and all sites neighbor upgrade to 3/3/3. in this case we propose to change change frequency IBS from F3 to the F1/F2 or F1/F3 , with2 carriers, Therefore IBS will operation like 2nd Carriers macro site but in Neighbor strategy need to define to limited the over shooting and interference from outdoor sites by one way neighbors

Option 1: F1 & F2: in case all sites neighbur operation with 3 carrier, same load and coverage so the Ec/No and CQI, RSCP are the same between 3 layers, this option is simple for setting and operating like as macro site, the interference and HSDPA throughput is not difference F2 and F3.

Option 2: F1&F3: in case in IBS area uses only 2nd carrier (F1&F2), therefore F3 will be better Ec/No and CQI, due to very low interference UL and DL. The HSDPA throughput is better in F3.

For VMS2 case with IBS NSN area in down town and most of sites will be upgrade to 3 layers so we proposal F1 & F2 for IBS. In case using F1 & F3 is same setting but have lightly differ in neighbor strategy to reduce overshooting RSCP. In this propose we present the case F1 & F2.

IBS Strategy – 2RF Carriers Mobility

F2

F1

GSM 2G Layer2G

Layer

Cell reselection

ISHO

IFHOCell

reselection

DRRC for HSDPA Layer

Connected mode

Idle mode

Service Type Setting EcNo (dB) RSCP (dBm) Remarks

R99 VoiceThreshold -15 -105

IFHO/ISHOCancellation -12 -102

R99 PSThreshold -15 -105

ISHOCancellation -12 -102

HSDPAThreshold -15 -105

IFHOCancellation -12 -102

AMR+HSDPAThreshold -15 -105

IFHOCancellation -12 -102

Parameter Value UnitSintrasearch 12 dBSinterseach 18 dB

Ssearch_RAT 2 dBQqualmin -19 dBQrxlevmin -99 dBm

F1 – HSPA+R99F1 – HSPA+R99

F2 – HSPAF2 – HSPA

ptxprimaryCPICH=300 (30dBm)

Cell weight=1

Cell weight=0.5

AdjiOffset 2=-50 for RT

UMTS F3

Mobility Parameters

SsearchRAT: 2 dB (-16 dB)

RT / NRTRSCP: -105Ec/No: -15

UMTS F2

SinterSearch: 18 dB (0 dB)

Qhyst2: 2 dB

AdjiQqualmin = -18dB

AdjiQrxlevmin = -105dBm

HHoRscpThreshold: -100

AdjiMinRSCP: -99dBm

UMTS F1

2G

HHoEcNoThreshold: -15 AdjiMinEcNo = - 13 dBAdjiSIB = 1

AdjiQoffset2 = -50 dB(for RT)

HHoRscpThreshold: -100

AdjiMinRSCP: -99dBm

HHoEcNoThreshold: -12

AdjiMinEcNo = - 13 dB

IFCR (F2→F1)IFCR (F2→F1)

ISCR (F1→GSM)ISCR (F1→GSM)

IFHO (F2→F1)IFHO (F2→F1)

ISHO (F1→GSM)ISHO (F1→GSM)

Connected mode

Idle mode

IFHO (F3→F1)IFHO (F3→F1)CellWeightForHSDPALayering:Weight : F1= 0.5Weight: F2= 1

IBS Neighbors Planning

Intra IBS

• ADJI : F1<-> F2

• ADJS : cells within same carrier

• ADJG : F1->GSM

Inter BTS

Macro to IBS

• ADJI : F3 F1

• ADJS : F2<->F2, F1<->F1

ADJI

IBS including 3G and GSM co-sites, we just need define ADJG for intra-IBS

One way

two way

F3

F1

GSM

F2

F1

GSM

Intra IBS

ADJG

ADJS

ADJS

ADJI

F3ADJI

F1: 10562F2: 10587F3: 10612

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Mobility – Idle mode

In idle mode, UE can be forced to camp certain carrier or allow UE to camp to any layer by nature of signal quality, With IBS site we propose to use Idle mode in F1 and DRRC to F2 with HSDPA

Cell Reselection parameters

• Negative AdjiQoffset in RT HOPI (RT HOPI parameter set is used for all idle mode UEs) can be used to force idle mode UEs to certain frequency

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Radio features

DRRC connection setup features works between layers (with equal coverage areas) within same BTS and under common sector id

• Directed RRC Connection Setup – DirectedRRCEnabled

• Directed RRC Connection setup for HSDPA layer

– Basic – DirectedRRCForHSDPAEnabled

– Enhanced – DirectedRRCForHSDPALayerEnhanc

• HSDPA layering for UEs in common channels HSDPALayeringCommonChEnabled

  Config 1 Config 2 Config 3 Config 4 Config 5

Number of carriers Single Multiple Max 2 Multiple Multiple

HSDPA enabled NO NO YES YES YES

Load Balancing for R99 traffic NO YES NO NO YES

Load Balancing for HSDPA traffic NO NO NO YES YES

Establishment cause NO NO NO YES YES

DirectedRRCEnabled Disabled Enabled Disabled Disable Enabled

DirectedRRCForHSDPAEnabled Disabled Disabled Enabled Enabled Enabled

DirectedRRCForHSDPALayerEnhanc* Disabled Disabled Disabled Enabled Enabled

Radio features

• DRRC for HSDPA Layer– UEs are directed to correct layer based on UE category only

▪ R5 or newer UEs stay on HS(D)PA support layer▪ R99 or R4 UEs remain on the R99 layer

– Not applicable in our case

• DRRC for HSDPA Layer Enhanced– DRRC load sharing between layers to balance the HSDPA loading, based on cell weight

and power

• HSPA layering for UEs in Common Channels– HS(D)PA UE in CELL_FACH state on R99 layer will be redirected to HS layer– Only PS RAB type is allowed (ServicesToHSDPALayer=1)– Not applicable in our case

F3

F1

F2

• convention for 2/2 configuration:

Cell ID = 1: xxxx1

Cell ID = 2: xxxx2

Cell ID = 4: xxxx4

Cell ID = 5: xxxx5

IBS Site ID Planning

UARFCN Allocation (DL):Carrier 1: 10562Carrier 2: 10587Carrier 3: 10612

Tcell Grouping and LCG

System Module

2 HSDPA cells1HSDPA schedulers activated

RF modules

f1

Scheduler

f2

f2

f1

Local Cell Grouping

Option: LCG1: cell1 cell4 simple config, but cannot allocate BB resources to each group of cells

Use only one Scheduler for both layers

2 sector ID

f1

Scheduler

f2

1 sector ID