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8/3/2019 QCES_UMTS_1
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CASE STUDY
ENGINEERING
SERVICES
GROUP
www.qualcomm.com/esg
Delivering technical evaluations and services to network
operators worldwide
The following case documents how
Qualcomm ESG used its proprietary QUEST
network simulation tool and novel parameter
optimization techniques at special event venues
(sports arenas, convention centers, concert
amphitheatres) to maximize network capacity
and maintain a high quality user experience.
AT ISSUE
Maintaining a consistent, high quality user experience at special events
The performance of 3G wireless networks during special events poses a unique
problem. The large concentration of smartphones with a usage profile of frequent,
short data connections reduces network efficiency and lowers downlink and uplink
capacity. This causes low call completion rates, frequent dropped calls, suboptimal
response times, and low throughputs. The degraded user experience can lead to
subscriber churn and often visible, public backlash.
THE CHALLENGE
Effectively dimensioning & maximizing UMTS network capacity during
special eventsOperators need a solution to accurately dimension their network resources and to
maximize network capacity for the unique RF conditions of special events.
Accurately estimating voice and data traffic demand during a special event, and
properly modeling the estimation to predict user experience with the deployed
capacity is quite complex. This is compounded by the capacity lost due to large
amounts of Radio Resource Control (RRC) signaling generated by the always
connected smartphone devices, a factor which traditional network dimensioning
techniques often overlook. Figure 1 illustrates the impact of excessive signaling at an
under-dimensioned venue: very low voice and R99 data traffic with very high
non-HS power consumption due to signaling that impacts connection accessibility
and retainability.
With inputs such as accurate data usage, device mix, traffic patterns andapplication type, the network resources can be adequately dimensioned and then
optimized for an improved user experience during special events.
SITUATION
u Large concentrations of subscribers
simultaneously access the 3G network
during special events.
u The typical smartphone usage patternof frequent, short data connections
increases network load, causing a
degraded user experience.
u Estimating user experience, particularly
for data traffic, during special events
is very challenging with the currently
available commercial tools.
SOLUTION
u Used QUEST simulation tool to
estimate data traffic demand and
validate user experience based on the
deployed capacity.
u Recommended specific networkparameter optimization settings to
reduce RRC connections.
RESULTS FROM SELECTED VENUES
u 90% reduction in inter-RAT related
RRC connections.
u 30% reduction in number of PS
connections.
u 50% reduction in number of FACH-to-
HS transitions.
u Optimized data throughput and
capacity management.
UMTS NETWORK OPTIMIZATION AT SPECIAL EVENT VENUES
Optimizing major stadiums for the
2010 FIFA World Cup with MTN
South Africa
The growth of 3G-capable smart phone
is allowing more people to enjoy wireless
data services while attending sporting
events, says Sameer Dave, chief technol
gy officer of MTN South Africa. This tren
brings unique network demands in
supporting large groups of subscribers i
a relatively small geographic area.Qualcomms engineering support was in
strumental in helping us ensure that spe
tators received the reliable, high-speed
voice and data services they have come
expect from MTN South Africa.
- Aug 17, 2010 www.qualcomm.com/pres
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8/3/2019 QCES_UMTS_1
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ENGINEERING
SERVICES
GROUP
www.qualcomm.com/esg
Cell0
0
200
400
600
800
1000
QUEST
ACTUAL
HSDPA
Throughputin
kbps
1200
Cell1Cell2
Cell3
THE SOLUTION
Partnering with Qualcomm to achieve maximum
network capacity
Qualcomm ESG optimized special event venues for several
tier-one operators to improve connection performance and
maximize system capacity using its QUEST simulation tool
and implementing novel parameter optimization techniques.
The goal was to estimate the capacity demand, accurately
dimension the network resources, develop the best possible
network design, and optimize the system parameters to maximize the capacity.
Qualcomm ESG employed QUEST to estimate the user experience for the forecasted
traffic and the deployed capacity at the special event venues. This validated the
deployed distributed antennae systems (DAS) design for the venues. QUEST used real-world network data for a given mix of inputs such as morphology, device mix, traffic
patterns, and application type. With this, QUEST accurately simulated the smartphone
traffic typically seen during special events and predicted the resulting traffic signaling.
Qualcomm ESG also analyzed the performance counters from prior special events at
each of the venues. The analysis revealed ping-pongs between WCDMA and underlying
GSM networks, inefficient usage of RRC states in data calls, and a significant number
of registrations. The excessive traffic generated due to registrations was minimized by
streamlining the periodic registration timers and inter-RAT cell reselection parameters
(both WCDMA to GSM and GSM to WCDMA). The PS connections were reduced, thereby
maximizing system capacity, by optimizing the (Forward Access Channel) FACH-Idle
inactivity timer, FACH buffer thresholds, and HSDPA cell change timer parameters.
RESULTSIncreasing capacity, providing uniform coverage and improving user
experience
Qualcomm ESG delivered comprehensive reports to the operators detailing the issues,
root causes and specific recommendations. Recommendations were tested at various
special event venues to achieve the below results.
u Actual user throughput estimated within 10% accuracy by using QUEST simulation
tool. See Figure 2.
u 90% reduction in registration and inter-RAT related RRC connections by increasing
the periodic registration timer from 1 hour to 3 hours and aggressively setting inter-
RAT cell reselections.
u 10% reduction in number of PS connections by increasing FACH-Idle inactivity
timer from 10 to 30 seconds.
u >30% reduction in number of PS connections by increasing FACH-Idle inactivity
timer from 10 to 300 seconds.
u Approximately 50% reduction in number of FACH-to-HS transitions by increasing
FACH to DCH/HS up-switch thresholds.
UMTS NETWORK OPTIMIZATION AT SPECIAL EVENT VENUES | CASE STUDY
2011.01 .V0
FIGURE 1: DL Power Utilization vs. Traffic
FIGURE 2: QUEST estimates actual user
throughput within 10% accuracy
FIGURE 3: Results from selected venues
About Qualcomm ESG
Qualcomm Engineering Services Group(ESG) provides technical consultation and
educational services for mobile technologi
from launching a mobile technology to
optimizing and troubleshooting mature
technologies.
16 17 18 19 20 21 22 23
0
20%
40%
60%
80%
100%
NonHSPowerUTotalPowerUtilErlang
Uti
lization
Erlangs
14
12
10
8
6
4
2
0Hours
Inter-RATrelatedRRCconnections
0
20%
40%
60%
80%
100%
PercentReduc
tion
NumberofPSconnectionsNumberofFACHtoHStransitions