Multi-Carrier Deployment Strategies.ppt

7/27/2019 Multi-Carrier Deployment Strategies.ppt

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WCDMA

Multi-Carrier Deployment Strategies


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AGENDA

Introduction Capacity Expansion Strategies

- Hot Spot Deployment

- One to One Overlay Deployment

Multi-carrier traffic Type Separation Strategies Parameter setting for Hot Spot deployment

IFHO for Coverage in Hot Spot deployment

Parameter setting for one-on-one deployment

WCDMA Boundary Case


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Introduction As the deployment of UMTS/WCDMA systems continuous to grow

all over the world, new capabilities are being added to the system,

and new services and applications, such as high speed data, video

streaming, video broadcasting, push to talk, and voice over IP, are

being provided or evaluated by 3G operators.

In order to provide 3G services in a most economical way, 3G

operators have also been considering or deploying multiple carriers

in their networks to meet these ever increasing demands.


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Capacity Expansion Strategies

Depending on business considerations, many different multi-carrier

strategies can be considered for expanding or deploying a WCDMAnetwork. Each approach has its own pros and cons.

This section lists three basic types of strategies :

- The hierarchical configuration for a balanced mobility and

capacity support,

- The capacity expansion for handling high traffic volumes, and

- service separation for improving system efficiencies.


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Hierarchical Cell Configuration:

Figure : A HCS deployment with 2 layers of macro cells and 1 layer of pico cells

Capacity Expansion Strategies (1)


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Capacity Expansion Strategies (2)

As wireless traffic increases a single-carrier deployment may become

insufficient and enforce network operators consider adding additionalcarriers to increase air interface capacity to attend the larger traffic demand.

Depending on network planning, potential traffic increase distribution, and

financial planning, the deployment strategy of the second or third carrier

varies. In general, there are two types of deployments of the

additional carriers to accommodate capacity expansions .

Hot spot deployment

One-to-one overlay deployment


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Hot spot: single cell or small cluster of border cells only (i.e. no cell is totally embedded by intra

frequency neighbors).

One-to-One Deployment : at least one cell is totally surrounded by intra frequency neighbors, i.e.UEs can rely on soft handover on the cell border. A cluster can therefore be anything from a few

sites to a complete one to one co-location with the other carriers.


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Deployment Benefits Drawbacks Suited for

Hot spot Lower costdeployment with

high capacity.

Performance, not fully utilizing the

coverage of the additional

WCDMA carrier (if same

frequency band). Higher

inter-frequency activity inhigh mobility areas.

High capacity areas with

low mobility, special

event like sports

stadiums and

concerts.

One-to-One High capacity.Addresses mid

and long termgrowth of traffic.

Higher initial efforts, more

additional carrier cells.

High traffic growth areas

and high mobility, like

business districts.


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Multi-carrier traffic type separation strategies

Considering the availability of HSDPA/HSUPA (a.k.a. HSPA) support in Rel-5/Rel-6,some network operators may consider an additional strategy of using the multiplefrequency deployment to separate different traffic types in a per-carrier basis. Inparticular, the following multi-carrier traffic type separation strategies are expected:

- HSPA (F2) overlaid on R99 (F1)

- HSPA+R99 (F2) overlaid on R99 (F1)

- HSPA (F2) overlaid on HSPA +R99 (F1)

Per-carrier traffic separation strategies can be applied to both capacity expansion

schemes (One-on-one and hot spot)


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Hot spot deployment without traffic separation In this approach, operators selectively add a second carrier at hot spots where the capacity

increase is most needed . As the traffic in the network increases, the second carrier coverage is

then expanded gradually; possible up to a fully-overlapped network . Parameter setting for Inter-Frequency Cell Reselection in hot spot overlay

deployment:


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IFHO For Coverage

Inter-frequency Handover Parameter Setting for Deploying HSPA Hot Spots

RSCP Ec/No


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One-on-one deployment without traffic separation

In this deployment, the second carrier is deployed covering the entire network in a

one-to-one cell overlay scheme. The network operation can also be made simpler by

disabling the inter-frequency handover and inter-frequency cell reselection at theprice of relatively lower system capacity. Given the fact the coverage is almost the

same between the two carriers.

Parameter Setting:


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Parameter settings for the fully overlapped 2-carrier network (Ec/No)


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Parameter Setting for the WCDMA Boundary Case


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Documents

Multi-Carrier Deployment Strategies.ppt