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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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Capacity Expansion Strategies
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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Capacity Expansion Strategies
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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