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 Layer
Cell reselection ISHO
IFHO
Cell reselection
DRRC for
HSDPA
Layer
Connected modeIdle mode
Service Type Setting EcNo (dB) RSCP (dBm) Remarks
R99 Voice
Threshold -15 -105
IFHO/ISHOCancellation -12 -102
R99 PS
Threshold -15 -105
ISHOCancellation -12 -102
HSDPA
Threshold -15 -105
IFHOCancellation -12 -102
AMR+HSDPA
Threshold -15 -105
IFHOCancellation -12 -102
Parameter Value Unit
Sintrasearch 12 dB
Sinterseach 18 dB
Ssearch_RAT 2 dB
Qqualmin -19 dB
Qrxlevmin -99 dBm
F1 – HSPA+R99
F2 – 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 / NRT
RSCP: -105
Ec/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)
ISCR (F1→GSM)
IFHO (F2→F1)
ISHO (F1→GSM)
Connected modeIdle mode
IFHO (F3→F1)
CellWeightForHSDPALayering:
Weight : F1= 0.5
Weight: 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
F3
ADJI
F1: 10562
F2: 10587
F3: 10612

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

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: 10562
Carrier 2: 10587
Carrier 3: 10612

Tcell Grouping and LCG
System Module
2 HSDPA cells1HSDPA schedulers activated
RF
modules
Tcell =
1
Tcell =
0
f1
Scheduler
Tcell =
7
Tcell =
6
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
Tcell = 0f1
Scheduler
Tcell = 6f2
1 sector ID