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Introduction
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AWE
offers detailed full dynamic simulation modules. These simulations
offers
a variety of different outputs. Time variant effects like the fast
power control, cell changes, and UE mobility are taken into account
and their impact on system performance can be studied in a very
detailed
manner.
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Basic
Simulation Principles
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Generation
of discrete mobile stations according to arrival
and ending processes and simulation of the network behavior over time
with
slot resolution. This enables to consider the fast power control
algorithm,
the movement of the mobile terminals and cell changes.
According to the traffic settings mobile terminals are generated
randomly.
If there are enough radio ressources available to serve the new mobile
station,
the initial transmission power is determined and the closed loop fast
power
control process is started. Considering all transmission links from all
mobiles
in uplink and downlink direction with its corresponding transmission
powers,
the interference levels can be determined for each mobile in uplink and
downlink,
repectively. The resulting SNIR levels can be compared with the target
levels
specified within the service definition, and the required power control
command
is send back to update the transmission power in the next slot. For
each mobile
the active set is controlled continuously by adding and removing links.
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Key
Features
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Some
of the key features of the dynamic WCDMA simulator are:
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Common
Channels (e.g. CPICH)
(freely configurable)
-
Different
services (e.g. Speech, Data)
-
Different
Mobile Types (speed, antenna, noise figure,
...)
-
Configurable
Traffic Generator
-
Mobility
Model
-
Fast
Power Control
(incl. error model)
-
Configurable
Active Set Control Algorithms
(Add-, Drop-, Replace-Window)
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Packet
Switched Services
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A
packet generator can be freely configured to produce a sequence of
packets
that have to be transmitted over the network. The packet generator
operates
on three levels: session level (UE lifetime), page level and packet
level.
Several parameters can be used adapt the packet source according to the
service
to be simulated: number of pages, page size, page reading time, packet
size,
packet interarrival time, ... The parameters can be given by a standard
distribution
or any user specified distribution.
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Outputs
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The
simulator offers a rich variety of output facilities. One class of
output is gathered during the dynamic simulation process for the
generated
mobile terminals. This allows a statistical evaluation of the
simulation
run:
-
Offered
Traffic, Carried Traffic
-
Blocking
and Dropping Rate
-
Transmission
Power Distribution
Another
important opportunity is the generation of output maps with the
information covering the whole simulation area. To generate these maps
a
scan mobiles is passed over the the simulation area and tries to
connect
to the network at each possible receiver pixel. During this scan the
state
of the dynamic simulation is frozen. The possible outputs include:
-
Resulting
Cell Footprints
-
Required
Transmission Power
-
Service
Coverage
-
Soft/Softer
Handover Areas
-
Common
Channel SNIR
To get an overview about the different outputs that can be generated
with the simulator, please have a look at the results from a sample project.
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