UMTS Multi-carrier Deployment Strategy

8/9/2019 UMTS Multi-carrier Deployment Strategy

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UMTS Multi-carrierDeployment Strategy

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Multi-Carriers ScenariosMulti-Carriers Scenarios11

Scenario 1: Two carriersScenario 1: Two carriers

22

Scenario 2: Three carriersScenario 2: Three carriers33

Special Case StudySpecial Case Study55

G900/U900 cooperation planningG900/U900 cooperation planning44



Multi-Carrier Deployment Scenarios

Scenario 1 Scenario 2





22






Strategy A : Randomly Camping

F 2

R99+HSPAR99+HSPA

R99+HSPA R99+HSPA

R99+HSPAF 1

Cell reselection

R99+HSPA

R99+HSPA

UE make cellreselection between F1

and F2

2 Carriers scenario

Randomly camping

Service bearer strategy

F1 support R99+HSPA

F2 support R99+HSPA

Service priority are same for both

carriers

Camping Strategy

Camp on F1 an F2 randomly

UE makes cell selection andreselection between F1 and F2

cells



Mobility of Strategy A

F 2

R99+HSPA

Inter-freq. HHO uni-directional

R99+HSPA

R99+HSPA R99+HSPA

R99+HSPAF 1

Intra-freq. SHO bi-directional

R99+HSPA

R99+HSPA

2 Carriers scenario

Randomly camping

Blind handover bi-directional

Allow intra-frequency handover based on coverage both for F1 & F2;

Allow handover based on coverage only from F2 to F1 at the coverage edge of F2, no

handover based on coverage from F1 to F2;

Configure blind handover neighboring relationships between F1 and F2 cells within thesame coverage range, allow bi-directional blind handover between F1 and F2 in the area

both F1 and F2 covered.



Loading Balancing For Strategy A

F 2

R99+HSPAR99+HSPA

R99+HSPA R99+HSPA

R99+HSPAF 1 R99+HSPA

R99+HSPA

DRD based on Loading balancing

Inter-freq. Handover based on LDR

Loadin Balancin

2 Carriers scenario

Randomly camping

LDR is activated for both F1 and F2 carriers. LDR

action are:

UL: BE reduction Inter-freq. HHO CS inter-

RAT handover

DL: Codes reshuffling BE reduction Inter-freq.

HHO CS inter-RAT handover

Bi-directional DRD based on loading balancing

(HSDPA users Number) between F1 and F2 is

activated.

To improve the user experiences of R99, DRD for

R99 services are not recommended.

Users will try F1 if rejected by F2, users will try

F2 if rejected by F1.

How to improve the

service success rate of

DRD between F1&F2

cells and improve user

experiences?

Decrease the DRD request times

between two carrier cells are main

solution:

a. Set 5% as the offset of HSPA

users between two carriercells (or higher), thus DRDwill happen only if differenceof HSDPA users between twocarrier cells are larger than5%;

b. Target network for DRD,Ec/No>-12dB;

a enges o u ons

Strategy



Strategy A Summary

R99+HSPA R99+HSPAR99+HSPA

R99+HSPA

F1

F2 Service bearer strategy

F1 support R99+HSPA

F2 support R99+HSPA

Service priority are same

on both carriers

2 Carriers scenario

Randomly camping

vantages o t s trategy ：：：：

Good user experiences of HSPA,

access delay is small, HSPA servicesetup success rate is high.

Big capacity space for HSPA services.

sa vantages o t s trategy ：：：：

Ping-pong cell reselection may exist

between F1 and F2 cells if cellselection and reselection parameters

are not set appropriately. Voice user experiences is not as good

as strategy B.



Strategy B: Prefer to Camp on F1

Cell reselection

UE back to F1 afterfinishing service on F2

by cell reselection

DRD based on Service

F 2

R99+HSPAR99+HSPA

HSPA+R99 HSPA+R99

R99+HSPAF 1

HSPA+R99

2 Carriers scenario

Prefer to camp on F1


F1 support R99+HSPA,

mainly for R99

F2 support R99+HSPA,

HSPA service is prior

Camping and Access Strategy

Force UE to camp on F1 only, F2 is barred, or configure cell

reselection parameters to make F1 as the first priority to camp

on.

Accept R99 service request on F1, DRD HSPA service to F2.

All the services will access on F1 in the area with F1 coverage

only.



Mobility of Strategy B2 Carriers scenario


F 2

R99+HSPAR99+HSPA

HSPA+R99 HSPA+R99

R99+HSPAF 1

HSPA+R99


Intra-freq. SHO


Allow intra-frequency handover based on coverage both for F1 & F2;

Allow inter-freq HHO based on coverage only from F2 to F1 at the coverage edge of F2, no


Configure blind handover neighboring relationships between F1 and F2 cells within same coveragerange, allow bi-directional blind handover between F1 and F2 within the area both F1&F2 covered.



Loading Balancing for Strategy B

F 2

R99+HSPAR99+HSPA

HSPA+R99 HSPA+R99

R99+HSPAF 1

HSPA+R99

Challenges SolutionsLoading Balancing Strategy

2 Carriers scenario


DRD based on service will split HSPA

users and R99 users on F2 and F1 carrier.

LDR activated for F1 and F2 carriers

actions of LDR are

UL: BE service reduction inter freq.

HHO CS Inter-RAT Handover

DL: Codes re-shufflingBE reduction

inter freq. HHO CS Inter-RAT Handover

Users with R99 service failured on F1 will

try F2;

How to guarantee the user

experiences in inter-freq.

handover triggered by

LDR?

Ping-pong handover is the main

problem here, ways to solve it:

a. Set 20% as the inter-freq. HHO

loading margin to avoid

the ping-pong handover.

b. Set 200Kbps as the maximum

throughput of users trying inter-freq.

HHO to avoid the big loading

fluctuate in the target cells.

This solution issuitable for all

inter-freq. HHOtriggered by

LDR.



Strategy B Summary

R99+HSPA

HSPA+R99

F1

F2 Service bearer strategy

R99 prior on F1;

HSPA prior on F2;

Advantages of this Strategy ：：：： Disadvantages of this Strategy ：：：：

2 Carriers scenario


Development of HSPA service wouldn’thave any impact on R99 services;

No ping-pong cell reselection riskbetween F1 and F2 cells;

setup, HSPA RAB setup success rate islower than strategy a. Will have negativeimpact on Call drop rate.

Normally R99 and H have the differentbusy hour, so frequency resources are not

fully used in most of the time.



Comparison of two Strategy

Advantages Disadvantages

Randomly Camping

(Strategy )

1. DRD is less, accessibility

KPIs are better;

2. Frequency resources are fully

used.

1. If F2 is not continuously covered, then

inter-freq. hard handover is introduced

for CS services, which has a impact on

the CS users experiences.

2. HSPA service has interference on R99

services.

A

orce o amp on

F1 carrier

(Strategy )

. ess n er erence rom

services to R99 services; No

impact on R99 services with

the introduction of HSPA.

2. No inter-freq. hard handover

for R99 services to improve

the users experiences.

. serv ces nee us serv ce

setup success rate could be lower;

2. Hard handover for HSPA services has

impact on HSPA service experiences.

3. If R99 traffic is too much to bear on

one carrier, then user experiences may

not good.

B



Strategies Summary

F1 is continuously covered;F2 is also continuously covered;

Randomly CampingWith loading Balancing

AStrategySuggested

F1 is continuously covered;F2 is NOT continuously covered;

Force to camp on F1With service delaminating

BStrategy

Suggested

R99 traffic is less, HSPA traffic isdominated

Randomly CampingWith loading Balancing

AStrategySuggested

R99 traffic can not be influenced Force to camp on F1With service delaminating

StrategySuggested





22






Strategy :Prefer to Camp on F1

F 2

F 1

UE back to F1 by cellreselection after service

on F2&F3

F 3

Cell reselection

DRD based onService

+R99

R99+HSPAR99+HSPA

+R99 +R99

R99+HSPA

+R99

3 Carriers scenario


+R99

Load balance


F1 support R99+HSPA, mainly

for R99

F2 and F3 support HSPA+

R99, HSPA is prior

Camping Strategy

Force UE camp on F1 only, F2&F3 are barred, or

configure cell reselection parameters to make F1 as the

first priority to camp on.

Accept R99 service request on F1, DRD HSPA service

to F2 and F3.



Mobility Strategy3 Carriers scenario


F 2

F 1

F 3

HSPA+R99

R99+HSPAR99+HSPA

HSPA+R99 HSPA+R99

R99+HSPA

HSPA+R99


Intra-freq. SHO


Allow intra-frequency handover based on coverage for all F1, F2 and F3 cells;

Allow inter-freq HHO based on coverage only from F2 to F1 at the coverage edge of F2, no


Allow inter-freq HHO based on coverage from F3 to F1 and F2 carrier cells, configure higher

priority for F2 compare to F1; No handover based on coverage from F1 to F3&F2;

Allow bi-directional blind handover for all F1, F2 and F3 carrier cells in the same coverage

range.

Configure GSM as neighboring cell both for F1, F2 and F3, only configure F1 as neighboring

cell for GSM.



Loading Balancing Strategy

F 2

F 1

F 3HSPA+R99

R99+HSPAR99+HSPA

HSPA+R99 HSPA+R99

R99+HSPA

HSPA+R99

3 Carriers scenario


In the access phase, accept R99 services on F1,

DRD HSPA services to F2 and F3;

R99 service will DRD to F2 or F3 carriers if service

requests rejected on F1; HSDPA users will setup on

F1 carriers if rejected both by F2&F3.

Set same LDR strategy for all F1, F2&F3 carriers:

UL LDR actions: BE service reduction Inter-freq.

Handover based on LDR CS Inter-RAT handover

DL LDR actions: Codes reshuffling BE reduction

Inter-freq. Handover based on LDR CS Inter-RAT

handover

Challenges Solutions

How to balance the

HSDPA users number onF2 and F3 in access phase?

Step 1: Set same SPG ID for F2 and F3

for HSDPA services

Step 2: Set loading based DRD withHSDPA users number, set the H

users number offset between the

F2 and F3 to be 5%

Strategy



Strategy Summary


F1 is mainly for R99;

HSPA prior on F2 and F3;

R99+HSPA

HSPA+R99 HSPA+R99

HSPA+ R99F3

F2

F1

3 Carriers scenario


：：：：

Development of HSPA service wouldn’thave any impact on R99 services;

No ping-pong cell reselection risk

between F1 and F2&F3 cells;

：：：：

DRD are needed for the HSPA servicesetup, HSPA RAB setup success ratewill be lower.

Frequency utilization efficiency is not

high, loading between F1 and F2&F3may not balanced.




Scenario 1: Two carriersScenario 1: Two carriers22






Coverage capability

Cell Coverage Comparison

Cell Coverage : UMTS 900Mhz 2.5~3 times larger than UMTS 2.1Ghz Radio planning U900 vs G900: Linkbudget +6~9dB, Better receiver sensitivity



Interference Varies from Site Deployment Pattern

Best mode

G/U Co-Site G/U on different Site

Least Interference High Interference

G/U Co-site solution is preferred regarding interference and TCO

Worst mode

G 900 BTS

U 900 NodeB



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Multi-carrier Strategy in T operator

1900 F2(H+DC)

1900 F1(R99H+DC)

1900 F2(H+DC)

1900 F1(R99H+DC)

1900 F2(H+DC)

1900 F1(R99H+DC)

850 F2(H+DC)

850 F1(R99H+DC)

850 F2(H+DC)

850 F1(R99H+DC) 850 F1(R99H+DC)



1900 F2(H+DC)

1900 F1(R99H+DC)

850 F1(R99H+DC)

1900 F2(H+DC)

1900 F1(R99H+DC)

850 F1(R99H+DC)

1900 F2(H+DC)

1900 F1(R99H+DC)

850 F1(R99H+DC)

Cell Reselection

Camp on

Not Camp on

Camping Strategy

850 F2(H+DC) 850 F2(H+DC)

User camp on the 850F1/1900F1 in idle mode.

User reselect back to 850F1/1900F1 after the dedicated mode in 850 F2/1900F2





1900 F2(H+DC)

1900 F1(R99H+DC)

850 F1(R99H+DC)

1900 F2(H+DC)

1900 F1(R99H+DC)

850 F1(R99H+DC)

1900 F2(H+DC)

1900 F1(R99H+DC)

850 F1(R99H+DC)

Intra-FHO

Inter-FHO

Mobility Strategy

850 F2(H+DC) 850 F2(H+DC)



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UMTS Multi-carrier Deployment Strategy