How to Deploy MOCN for T Project

How to deploy MOCN for T P r o ec t

HUAWEI TECHNOLOGIES CO., LTD.

Content 

Performance Performance Risk Risk in RAN Sharing Sharing-->MOCN ->MOCN Process    

Intra-frequency Intra-frequency interference issue of 99,00 boundary Load balance of 00 commercial strategy Risk in Swap Process KPI Moni Monitor tor in MOCN MOCN

HUAWEI TECHNOLOGIES CO., LTD. HISILICON SEMICONDUCTOR

Page 22 Page

MOCN Architecture Common PLMN XXXX TMV CN 52099

MSC

。。。

SGSN

RMV CN 52000 MSC

MSC

SGSN

SGSN

Iu interface

RNC



The shared RAN is connected to multi-operators’ core network;



In MOCN, frequency and baseband resources are shared;



Each operator can deploy Iu-flex independently;

Iub interface NodeB

。。。

f1 f2

99+00 00 HUAWEI TECHNOLOGIES CO., LTD. HISILICON SEMICONDUCTOR

Shared RAN

00 00

MOCN cell Dedicated cell

Page 3

Configuration Discussion BMA

LAC

3G F1

99+00

00

3G F2

00

00

00

00 00

F2’

GSM 99

There are not roaming relationship between 3G of 99 and 00; 

1, F1/F2 configure in the same LAC; different LAC with GSM 2, Neihboring configuration between F1/F2/GSM 3, ePLMN configure for 52000 user only. Configure in GSM 99/ 3G 00 core network.


Page 4

Mobility of 99 99’s ’s user Handover

BMA 3G F1

99+00

Cell Reselection A

X

00

B

00

00

X 3G F2

00

00

00

F2’

GSM 99

3G<->3G

99 From F1 to F2, not allowed;F2 reject 99 user by PLMN(PLMN not allowed) From Cell A to B, not allowed, 99 user drop to GSM;Cell B reject 99 user by PLMN(PLMN not allowed)

3G ->2G

Coverage based inter PLMN inter-RAT handover;

2G<->3G

Cell reselect back to F1(No ePLMN, will not select F2); HPLMN reselect;


Page 5

Issue： When 99 user in BMA boundary move outside BMA area, it can only hand over to GSM 99, due to BMA outside F1/00 can not support the handover.

intraintra-frequency interference 00user

The RTWP of outside F1/00 cell may rise, the RTWP of F1/99+00 cell may rise little.

99 user F1 F2 F1 F2

F1 F2

99+00 00 99+ 99+00 00 99+00 00 BMA

99+00 00 99+ 99+00 00 99+00 00 BMA boundary

00 00 00 00

Impact Object

Impact

Reason

boundary F1/99 user

Accessibility Ratio maybe worse

1)When UE access the side to outside can not do soft handover , Accessibility Ratio decrease ue o r se o +

Call Drop Rate maybe worse

1)More Inter-RAT handover may cause CDR worse 2)Due to RTWP rise of F1/99+00

Inter-RAT handover time increase

If the GSM capacity is not enough ,more use rs handover to GSM may cause GSM congestion will cause handover success ratio decrease


Due to RTWP rise of F1/00


Due to RTWP rise of F1/00

00 00 outside

GSM 99 outside F1/00 user


Page 66 Page

intraintra-frequency interference analysis(1) Outside

Boundary 99+ 99+00

To simply the model , Couple Loss is defined as the loss between the Base TX and UE, including the antenna gain and path loss

00 B Couple Loss2

Couple Loss1 99 GSM 99

Analysis ： 2D trigger at -100dBm，CPICH is 33dBm ，the couple loss is 133dB From the link budget, in some scenarios, 99 user will cause the RTWP rise of outside F1/00 B cell. This is relevant with service and UE position. Solution： 99 user should be able to handover to GSM asap.00 user should keep intra-frequency handover. HUAWEI TECHNOLOGIES CO., LTD. HISILICON SEMICONDUCTOR

Page 77 Page

intraintra-frequency interference analysis(2) Outside

Boundary 99+00

00 B Couple Loss2

Couple Loss1 00 GSM 99

1A threshold is 3dB Assume RTWP of outside F1/00 is -98dBm,before 1A event triggered, the interference to F1/99+00 is calculated above. This kind of interference is temporary for after 1A triggered, F1/99+00 can control the UE TX power.


Page 88 Page

Solution1 00user

Impact Object

Impact

Effect

boundary F1/99 user


N/A


N/A


N/A


Improved


Improved

99 user F1 F2 F1 F2

F2

99+00 00

99+00 00

99+00 00 99+00 00 BMA

00 00

99+00 00

00 00

+ 00

00 00

BMA boundary

boundary F1/99 user

Reason BMA 99+00

99+00 capacity loss

Block boundary

Boundary 00

Bearing more capacity

Block boundary F1/99+00 cell

outside

GSM 99

Solution: Block boundary F1/99+00 cell as buffer zone

99+00

Impact：Buffer Zone is simple to deploy ，but there is some capacity loss.


Page 99 Page

Blocked for Buffer Zone

Solution 2 UE TX (dBm)

00 Boundary

Cell A

Outside

Handover area

Cell B

00 B

99+00 Couple Loss1

Couple Loss2

20

99

99 Handover area

GSM 99

00

-20 distance When 00 user leave Cell A to Cell B, 00 user UE TX power is less after handover to Cell B When 99 user leave Cell A to Cell B , the UE TX power increased until the RSCP or Ec/No 2D event trigger coverage handover to GSM The UE TX power of two users is depicted in the figure.


Page 10 10 Page

2D trigger

Solution 2 UE TX (dBm)

Cell A

Handover area

20

Cell B

99

2D trigger UE Tx power limited

00

-20

Solution: Switch on the handover based on UE TX power to make F1/99 user more early handover to GSM Impact: If the UE Tx power limited trigger threshold set too high, the effect is not obvious. If the UE Tx power limited trigger threshold set too lower,F1/00 user may trigger handover to GSM HUAWEI TECHNOLOGIES CO., LTD. HISILICON SEMICONDUCTOR

Impact Object

Impact

Effect

boundary F1/99 user


some improved


some improved

Inter-RAT handover times may increase

Times increase


Improved


Improved

threshold

distance

boundary F1/99 user

Reason boundary F1/00 user

Inter-RAT handover times may increase Call Drop Rate maybe worse

Page 11 11 Page

UE Tx power limited trigger threshold too small

Solution 2(The Rule of setting threshold)

UE TX (dBm)

Cell A

Handover area

20

The rule of setting UE Tx Power limited trigger threshold.

Cell B

When 00 user leave Cell A to Cell B, we choose the maximal 00 UE Tx power as the threshold.

99

00

-20

UE Tx power limited trigger threshold

distance

So 00 user will soft handover to Cell B. Otherwise 99 user will trigger handover to 2G.

The maximal 00 UE Tx power


Page 12 12 Page

Solution 3（Modified in Product）

Impact Object

Impact

Effect

boundary F1/99 user


Improved


Some improved


Not improved


Improved


Improved

Outside

Boundary 99+00

00 B Couple Loss2

Couple Loss1

boundary F1/99 user

99 GSM 99

Solution: When 99 user move to F1/00 B cell, firstly active set is added, then trigger Inter-RAT handover process. Due to this mechanism, the UE TX Power of 99 user can be controlled by F1/00 B cell. So the Uplink interference can be eliminated some. Impact: Some Product code should be modified. Some resource of F1/00 B cell is used.


Page 13 13 Page

00 Commercial dual carriers strategy After 00 Commercial launched, Two strategy can be used 1.Free camping / Load balancing strategy 2.Preferred camping/Service steering strategy


Page 14 14 Page

Free camping / Load balancing strategy Cell Reselection

BMA 3G F1

3G F2

99+00

00

A

00

B

00

00

Idle

00 can choose better Ec/Io cell to camp on

Access

00 user start services where the carrier camp on

00

00

F2’

MOD UCELLSELRESEL: CellId=, QualMeas=CPICH_ECNO, QrxlevminExtSup=FALSE, IdleSintrasearch=127, IdleSintersearch=127, NonhcsInd=NOT_CONFIGURED;


Page 15

Real Network Application(Canada Bell free camping strategy analysis)

RRC request times

AMR Erlang

HSDPA user number

In the 24 hours, RRC request times and traffic traffic of three three carriers carriers is is almost almost the same. same. So free camping strategy is fit for load balance.


Page 16 16 Page

Preferred camping/Service steering strategy Cell Reselection

BMA 99+00

3G F1

3G F2

00

A

00

B

00

00

00

00

Idle

00 prefer to camp on F1

Access

00 user start R99 services where the carrier camp on 00 user start H services DRD to F2/cell based on service steering

PriorityServiceFor F1 F2

R99RT R99NRT 1 1 1 1


HSDPA 2 1

HSUPA 2 1

Page 17

Service Steering DRD

F2’

Mobility of 00’s user Handover

BMA 3G F1

99+00

3G F2

00

Cell Reselection A

00

B

00

00

00 00

F2’

GSM 99

00 3G->2G

Coverage based inter PLMN inter-RAT handover; （PS service reselect to GSM ）

2G<->3G

Cell reselect back to F1/F2; (PS PS service can’t reselect to 3G 3G)

3G<->3G

Handover between F1/F2 and Cell A/B


Page 18

Strategy Comparison F1/99+00 F2/00

Free camping / Load balancing strategy 99 User R99+H 00 User R99+H

Preferred camping/Service steering strategy 99 User R99+H 00 User R99

00 User R99+H

00 User H

Free camping / Load balancing strategy

Preferred camping/Service steering strategy If 00 user is too many,F2/00 can not bear the R99 user of F2/00.The F1/99+00 may congestion.

99 User

user s oo many, can a sor more 00 User.99 User will not affected.

00 User

If 99 User is too many, the load of If 99 User is too many,00 user can not F1/99+00 is heavier. The EcIo of F1/00+99 offload to F2/00 this may cause KPI is worse, The 00 user can reselect to F2/00 worse. to offload the traffic.

Free camping strategy is good for load balancing. Preferred camping may cause traffic unbalanced which cause KPI degradation.


Page 19 19 Page

How to get the target network RMV(PLMN2)

RMV(PLMN2)’

TMV(PLMN1)

Core Living CN for TMV

New CN pool for RMV

Test bed CN for RMV

RNC RNC1

RNCn

RNC1

•New

RNCn

BMA

UPC

•New

RAN Sharing

F1

PLMN1

PLMN2

F2

PLMN2


RNC

•Rehoming

PLMN2

Page 20

NodeB

How to get the target network RMV(PLMN2)

TMV(PLMN1)

RMV(PLMN2)’

C o re

New CN pool for RMV

Test bed CN for RMV

Living CN for TMV

RNC RNC1

RNCn

RNC1

New CN pool Rehoming RNC • Change to MOCN •

RNCn

•

BMA

UPC

MOCN RAN Sharing

F1

PLMN2+PLMN1 PLMN1

PLMN2

F2

PLMN2


PLMN2

Page 21

Risk in Swap Process 1.Inter-PLMN 3G to 2G handover has been used in many other projects.

2.Except the intra-frequency interference issue, there is no special risk in swap process.


Page 22 22 Page

KPI Monitor Item RTWP TCP CS CDR PS CDR RRC

KPI Reference VS.MeanRTWP VS.MeanTCP.NonHS CS Service Drop Ratio (Cell) PS Call Drop Ratio (Cell) RRC Setup Success Ratio (Cell.Service) RRC Setup Success Ratio (Cell.Other)

CS W2G Inter-RAT Handover Out Success Ratio (Cell) Inter-RAT PS W2G Inter-RAT Handover Out Success Ratio (Cell)

Except regular KPI monitor, RTWP RRC CDR Inter-RAT success ratio should be monitored carefully.


Page 23 23 Page

How to Deploy MOCN for T Project

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