U900 Deployment Considerations_v

U900 DEPLOYMENT CONSIDERATIONSOptimization - Central

BACKGROUND This is the UMTS 900 deployment scenario proposed by Optimization

Central Team.

This proposal addressed idle mode and connected mode UE behavior without the RU30 MBLB feature.

This proposal is drafted based on the required behavior from the network. Settings may need to be fine tuned based on the pilot cluster performance/behavior.

IDLE MODE BEHAVIOUR

IDLE MODE BEHAVIOUR - INTRAFREQUENCY (1/1)

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F4 – 900 F4 - 900

Replicate the existing ADJS on F1 layer for U900.

U2100Parameter GUI Value

Qhyst1 2dBQhyst2 2dB

QqualMin -18dBQrxlevMin -18dB

Sintersearch 6dBSintrasearch 10dBSsearch_RAT 2dBTreselection 1sec





IDLE MODE BEHAVIOUR – INTERFREQUENCY (1/4)

Inter-frequency measurements restrictions on UE in FDD mode based on 3GPP specs. UE can measure only two UARFCNs in FDD mode.

Needs confirmation on what is stated in NED. Also need to verify IDLE

Mode behavior.

IDLE MODE BEHAVIOUR – INTERFREQUENCY 2/4

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F4 – 900 F4 - 900

Start inter-frequency measurements at EcNo = -12dB [QqualMin = -18dB (-18), Sintersearch=6dB (4)], Qrxlevmin=-115 dBm (-58)].

Measurement Offsets used for EcNo & RSCP (AdjiQoffset2 = AdjiQoffset2 = 3dB).

AdjiQqualMin = -16dB to enable reselection to U900 & AdjiQrxlevmin=-110 dBm -> to prevent reselecting to U900 cell with good Ec/No but poor RSCP.

Qhyst1=Qhyts2=2db.

HOPI 21 to be used for NrtHopiIdentifier & RTHopiIdentifier for ADJI defined in U2100 F1/F2/F3 Cells towards U900 Cells

Start inter-frequency measurements EcNo = -4 dB [QqualMin = -18dB (-18), Sintersearch=14dB (6), Qrxlevmin=-115 dBm (-58).

Measurement Offset used for EcNo to favor U2100 (AdjiQoffset2 = -10dB)

Measurement Offset used for RSCP to favor U2100 (AdjiQoffset1 = -10dB)

To ensure minimum coverage and quality at U2100 cell edge and no ping pong AdjiQqualMin = -12 dB & AdjiQrxlevmin = -95dBm

HOPI20 to be used for NrtHopiIdentifier & RTHopiIdentifier for ADJI defined in U900 towards U2100 F1/F2/F3 Cells

U2100 U900

U900 U2100

Source Layer

Neighbour Layers

U900 F1, F3F1 U900, F3F2 F1, U900F3 F1, U900

UARFCNEcNo < -18 dB

-18 dB <= EcNo < -14 dB

-14 dB <= EcNo < -10 dB

-10 dB <= EcNo < -6 dB

-6 dB <= EcNo < 0 dB

10648 1.87% 17.75% 27.21% 34.02% 19.15%10673 1.77% 12.62% 41.14% 28.86% 15.60%10698 1.65% 11.76% 39.75% 30.35% 16.48%

UARFCN -18 dB <= CPICH EcNo < -10

dB -10 dB <= CPICH EcNo < 0 dB10648 44.96% 53.17%10673 53.77% 44.47%10698 51.51% 46.84%

M1033 BASED EC/NO DISTRIBUTION FOR UARFCNS

F1 is the best.F3 is second best.F2 is worst.

IDLE MODE BEHAVIOUR – INTERFREQUENCY (3/4)

IDLE MODE BEHAVIOUR – INTERFREQUENCY 4/4

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F4 – 900 F4 - 900U2100

Parameter GUI ValueQhyst1 2dBQhyst2 2dB







HOPIIdAdjiQoffse

t1AdjiQoffset2

AdjiQqualMin

AdjiQrxlevMin

Current HOPI used among U2100

5 0dBm 0dB -18dB -115dBm

HOPI: From U2100 to U900 21 3dBm 3dB -16dB -104dBmHOPI: From U900 to U2100 20 10dBm 10dB -12dB -95dBm

IDLE MODE BEHAVIOUR – INTERSYSTEM

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F2 - 2100

F1 - 2100

F3 - 2100

F4 – 900 F4 - 900

GSM GSM GSM

Max number of UTRAN Idle mode reselection neighbours that can be defined per cell for Ericsson 2G is 64. NSN 2G supports 32 ADJW neighbours only per GSM cell.

So replicate the existing 3G->2G ADJGs as ADJW. 3G-2G (ADJG) Neighbours should be defined for collocated sector + Tier1 neighbours.

CONNECTED MODE(WITHOUT MBLB)

CONNECTED MODE BEHAVIOUR RT

F3 - 2100

F4 - 900

F2 - 2100

F3 - 2100

F2 - 2100 F2 - 2100

F3 - 2100

F1 - 2100F1 – 2100 F1 - 2100

F4 - 900

GSM GSM GSM

Legend

IFHO

ISHO

SHO

In case Interfrequency Cell Found Ratio remains very low with high speech drop on U2100 layer, we can define more ADJIs by keeping AdjiSIB to 0 so that these neighbours will only be used in connected mode and at the same time limit the size of SIB11.

Source Layer

Neighbour Layers

U900 F1, F3F1 U900, F3F2 F1, U900F3 F1, U900

CONNECTED MODE BEHAVIOUR NRT HSDPA (2/2)

F3 - 2100

F4 - 900

F2 - 2100

F3 - 2100

F2 - 2100 F2 - 2100

F3 - 2100

F1 - 2100F1 – 2100 F1 - 2100

F4 - 900

GSM GSM GSM

LegendIFHO for HSDPA (Ec/No & RSCP)

BTSSupportForHSPACM = 1

Source Layer

Neighbour Layers

U900 F1, F3F1 U900, F3F2 F1, U900F3 F1, U900

DC CapaHO

HOPIId

AdjiEcNoMarg

in

AdjiMinEcNo

AdjiMinEcNoNCHO

AdjiMinRSCP

AdjiMinRscpNCHO

AdjiPenaltyTi

me

AdjiPenaltyTimeNCHO

AdjiPlossMarg

in

AdjiPriorityCoverage

AdjiPriorityDCellCAHO

AdjiPriorityHSCAHO

AdjiPriorityMIMOCAHO

AdjiPriorityQuality

AdjiPrioritySLHO

Current HOPI used among U2100

5 1dB -16dB -14dB -105dBm -100dBm 0secs 10secs 2dB 0 0 0 0 0 0

HOPI: From U2100 to U900 21 1dB -16dB -14dB -105dBm -100dBm 0secs 10secs 2dB 0 0 0 0 0 0

HOPI: From U900 to U2100 20 1dB -16dB -14dB -105dBm -100dBm 0secs 10secs 2dB 0 0 0 0 0 0

RncId

WBTSId

LcrId AdjiCIAdjiNCHOHSPASupport

XX XXU900 Cell

F1/F2 U2100 Cell 1

XX XX

F1/F2/F3

U2100 Cell U900 Cell 0

With Frequency Based

LCG Grouping

DC HSDPA

FMCI FMCSFMCG

RT+RTwithHSDPA

Parameter Object F1 F2 F3 U900

IFHOcauseCPICHEcNo FMCI 1 1 1 0

IFHOcauseCPICHrscp FMCI 1 1 1 0

IFHOcauseTxPwrDL FMCI 0 0 0 0

IFHOcauseTxPwrUL FMCI 0 0 0 0

IFHOcauseUplinkQuality FMCI 0 0 0 0

NRT







HSDPA







RT

ParameterObjec

t F1 F2 F3 u900

GSMcauseCPICHEcNo FMCG 1 1 1 1

GSMcauseCPICHrscp FMCG 1 1 1 1

GSMcauseTxPwrDL FMCG 1 1 1 1

GSMcauseTxPwrUL FMCG 1 1 1 1GSMcauseUplinkQualit

y FMCG 1 1 1 1NRT

ParameterObjec

t F1 F2 F3U90

0





y FMCG 0 0 0 0RTwithHSDPA

Parameter Object F1 F2 F3U90

0





y FMCG 0 0 0 0HSDPA

ParameterObjec

t F1 F2 F3U90

0





y FMCG 0 0 0 0

RT + RTwithHSDPA + RTwithHSPA

Parameter Object F1 F2 F3 u900

HHoEcNoThreshold FMCS -14 -14 -14 -14

HHoEcNoCancel FMCS -11 -11 -11 -11

HHoRscpThreshold FMCS -105 -105 -105 -105

HHoRscpCancel FMCS -102 -102 -102 -102

NRT + HSDPA + HSPA + DCellHSDPA


HHoEcNoThreshold FMCS -18 -18 -18 -24

HHoEcNoCancel FMCS -13 -13 -13 -21

HHoRscpThreshold FMCS -112 -112 -112 -115

HHoRscpCancel FMCS -109 -109 -109 -112

CONNECTED MODE BEHAVIOUR FMCX PARAMETERS

SECTOR BASED VS FREQUENCY BASED LCG GROUPING FOR U900

Most Optimum Scenario

Sector BasedaccessBbCapacity

(LCG1/LCG2)Total Baseband Sub units available for traffic(4+4+4 with 2 FSMEs)

35 N/A

Total HSDPA Schedulers 4 (2 per FSM) -

Number of DCHSDPA capable cells

3 -

HSDPA Scheduler users limitation vs cell user capacity

Yes (4HSDPA Cells = 72*4 = 288 Users while 1 HSDPA Scheduler supports 240

users) --> 48users capacity lost

-

Other KPIs impact

Higher SHO overhead because of Soft rather than

softer handover between the LCGs

-

Most Optimum Scenario

Frequency Based

accessBbCapacity

(LCG1/LCG2)

Total Baseband Sub units available for traffic(4+4+4 with 2 FSMEs)

36 50/50

Total HSDPA Schedulers 4 (2 per FSM) -

Number of DCHSDPA capable cells

2 -

HSDPA Scheduler users limitation vs cell user capacity

No -

Other KPIs impact DCHSDPA limited to F1/F2 -

Sector Based

Frequency Based

* Additional subunit for CCCH resources needed if one System Module and more than 6 cells/10km cell range/2way Rx div.

Documents

U900 Deployment Considerations_v