UMTS Multi-carrier Deployment Strategy

UMTS Multi-carrier

Deployment Strategy

www.huawei

.com

1

1

Scenario 1: Two carriers

Scenario 1: Two carriers

2

2

Scenario 2: Three carriers

Scenario 2: Three carriers

3

3

Special Case Study

Special Case Study

5

5

G900/U900 cooperation planning

G900/U900 cooperation planning

4

4

Multi-Carrier Deployment Scenarios

1

1

Scenario 1: Two carriers

Scenario 1: Two carriers

2

2

Scenario 2: Three carriers

Scenario 2: Three carriers

3

3

Special Case Study

Special Case Study

5

5

G900/U900 cooperation planning

G900/U900 cooperation planning

4

4

Strategy A : 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 and

reselection 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+HSPA F 1

Intra-freq. SHO bi-directional

R99+HSPA R99+HSPA

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 the same coverage range, allow bi-directional blind handover between F1 and F2 in the area both F1 and F2 covered.

Loading Balancing For Strategy A

DRD based on Loading balancing

Inter-freq. Handover based on LDR

Challenges Solutions Loading Balancing

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 carrier cells (or higher), thus DRD will happen only if difference of HSDPA users between two carrier cells are larger than 5%;

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

Challenges Solutions Loading Balancing

Strategy A Summary

R99+HSPA R99+HSPA R99+HSPA

R99+HSPA

F1 F2

Service bearer strategy

F1 support R99+HSPA F2 support R99+HSPA Service priority are same on both carriers

Advantages of this Strategy

：

：

：

：

Disadvantages of this Strategy

：

：

：

：

Randomly camping

Advantages of this Strategy

：

：

：

：

Good user experiences of HSPA,

access delay is small, HSPA service

setup success rate is high.

Big capacity space for HSPA services.

Disadvantages of this Strategy

：

：

：

：

Ping-pong cell reselection may exist

between F1 and F2 cells if cell

selection and reselection parameters

are not set appropriately.

Voice user experiences is not as good

as strategy B.

Strategy B: Prefer to Camp on F1

Service bearer strategy

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 B

Inter-freq. HHO uni-directional Intra-freq. SHO

Blind handover bi-directional

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 handover based on coverage from F1 to F2;

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

Loading Balancing for Strategy B

Prefer to camp on F1

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-shuffling BE 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 is

suitable for all inter-freq. HHO

triggered 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

：

：

：

：

DRD are needed for the HSPA service

Prefer to camp on F1

Development of HSPA service wouldn’t have any impact on R99 services;

No ping-pong cell reselection risk between F1 and F2 cells;

DRD are needed for the HSPA service setup, HSPA RAB setup success rate is lower than strategy a. Will have negative impact on Call drop rate.

Normally R99 and H have the different busy 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.

Force to Camp on

A

Force to Camp on

F1 carrier

(Strategy )

1. Less interference from HSPA 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.

1. HSPA services need DRD thus service 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.

Strategies Summary

F1 is continuously covered;

F2 is also continuously covered;

Randomly Camping

With loading Balancing

A

Strategy

Suggested

F1 is continuously covered;

F2 is NOT continuously covered;

Force to camp on F1

With service delaminating

B

Strategy

Suggested

B

R99 traffic is less, HSPA traffic is

dominated

Randomly Camping

With loading Balancing

A

Strategy

Suggested

R99 traffic can not be influenced

_{Force to camp on F1}

With service delaminating

B

Strategy

1

1

Scenario 1: Two carriers

Scenario 1: Two carriers

2

2

Scenario 2: Three carriers

Scenario 2: Three carriers

3

3

Special Case Study

Special Case Study

5

5

G900/U900 cooperation planning

G900/U900 cooperation planning

4

4

Strategy :Prefer to Camp on F1

F 2

F 1

UE back to F1 by cell reselection after service

on F2&F3 F 3 Cell reselection DRD based on Service +R99 R99+HSPA R99+HSPA +R99 +R99 R99+HSPA +R99 Prefer to camp on F1 +R99 Load balance

Service bearer strategy

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 Strategy

Inter-freq. HHO uni-directional Intra-freq. SHO

Blind handover bi-directional

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 handover based on coverage from F1 to F2;

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

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 on F2 and F3 in access phase?

Step 1: Set same SPG ID for F2 and F3 for HSDPA services

Step 2: Set loading based DRD with HSDPA users number, set the H users number offset between the F2 and F3 to be 5%

Loading Balancing Strategy

Strategy Summary

Service bearer strategy

F1 is mainly for R99; HSPA prior on F2 and F3;

Advantages of this Strategy

：

：

：

：

Disadvantages of this Strategy

：

：

：

：

R99+HSPA HSPA+R99 HSPA+R99 HSPA+ R99 F3 F2 F1 Prefer to camp on F1

Advantages of this Strategy

：

：

：

：

Development of HSPA service wouldn’t have any impact on R99 services;

No ping-pong cell reselection risk between F1 and F2&F3 cells;

Disadvantages of this Strategy

：

：

：

：

DRD are needed for the HSPA service setup, HSPA RAB setup success rate will be lower.

Frequency utilization efficiency is not high, loading between F1 and F2&F3 may not balanced.

1

1

Scenario 1: Two carriers

Scenario 1: Two carriers

2

2

Scenario 2: Three carriers

Scenario 2: Three carriers

3

3

Special Case Study

Special Case Study

5

5

G900/U900 cooperation planning

G900/U900 cooperation planning

4

4

Cell Coverage Comparison

Cell Coverage : UMTS 900Mhz 2.5~3 times larger than UMTS 2.1Ghz

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

!

!

!

!""""

#

#

#

#

$ % ! &

$ % ! &

$ % ! &

$ % ! &

' (

' (

' (

' (

$ )(#

$ )(#

$ )(#

$ )(#

* !% + * , )(# $-$ $ % ! ' . ' $ ! --* -- $+/ * --+ - ' !% & +0 !" 1 !% + * -- + -! -- * 2!$ ! ' * -- + )(# * -- + ' )(# --' (3--'

--) $ !

-

$ % ! 4!

)(# ' (

5 $ !

-

$ % ! &

)(#

$ ' (

1

1

Scenario 1: Two carriers, same freq. band

Scenario 1: Two carriers, same freq. band

2

2

!#

Scenario 2: Two carriers, different freq. band

Scenario 2: Two carriers, different freq. band

3

3

Special Case Study

Special Case Study

5

5

G900/U900 cooperation planning

G900/U900 cooperation planning

4

4

Multi-carrier Strategy in T operator

1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) 1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) 1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) Cell Reselection Camp on Not Camp on

Camping Strategy

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

1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) 1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) 1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC)

H user num balancing

Service Bearer Strategy

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

All of carriers support R99+HSPA, same band carrier as DC carrier group support DC.

R99 service initiated in camping cell;

1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) 1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) 1900 F2(H+DC) 1900 F1(R99 H+DC) 850 F1(R99 H+DC) Intra-FHO Inter-FHO

Mobility Strategy

#

1 6

!!! "# !

$

www.huawei

.com