Electronics and Telecommunications ICRAMET 2014
Batam – Indonesia | 7 – 8 May 2014
ICRAMET
108 specifications with better speed than before, until now that is
introduced in LTE Release 8 with downlink speeds of up to 150 Mbps, and Uplink 75 Mbps. As seen in Figure 2.1
Figure 2.1 Flow Evolution Towards HSPA
[1]
Not only on the downlink and uplink speeds are increasing, UMTS technology also has some changes on the network
device technologies in terms of architecture.This course aims to support the improvement of the quality of mobile
communications. Figure 2.2 is a HSPA network architecture that is used by mobile network operators in Indonesia.
Figure 2.2 Network Architecture Release 6
[2]
2.2. Performance Measurement UMTS HSPA
Performance measurement is a new phase of the monitoring data.Earlier network monitoring is done by decoding
messages and filter out messages that originate from the same call. One call that has been analyzed and the failures that
occur only when certain common. Performance measurement is an effective way to observe the entire network at any time
and can systematically find errors, bottlenecks and conditions unusual in the network. Performance measures is quite unique,
there are many parameters and events that can be measured also many measurements that can be correlated with each
other, with an unlimited number of permutations. Performance measures and data collection is done by doing a test drive.
The data obtained from the test drive is useful in: • Obtain the actual condition after parameter optimization
HSPA+ • Test data rates for HSDPA and HSUPA services
• Test the throughput of HSPA+ HSDPA and HSUPA • Ensure all the normal state of the network after optimization
HSPA+ In addition to the data drive test, also making observations
and collecting data from the RNC before and after activation is done. Data RNC, is useful to look at the values of the
parameters KPI accessability, retainability, and mobility that existed at the RNC. In addition to KPI parameter values
observed increase in throughput resulting from the activation of the feature.Not only the data from the KPI parameters
considered, the parameters that exist in the NodeB congestion also need to be considered, such as power congestion, CE
congestion, congestion code, and Iub congestion.The question is: Why do the observation and data collection of KPI?
general answer to this question proper, are: A network operator shall determine that the business targets based on the
economic value of Key Performance Indicators KPI. Target business provides guidelines for determining network
optimization targets, and these targets are technically derived from the KPI targets.
2.3. Key Performance Indicators KPI
KPI is an indicator that shows the performance of a cellular network. Determination of KPI values used for planning and
network optimization. Starting with a target KPI to be used in the design, the formula used, the identification of the network
output, as well as formulate and calculate KPIs for network optimization. The main objective of the optimization is to get
close to or the same KPIs with KPIs targets have been set while the initial planning.
2.4. Parameter KPI
[3]
KPI parameters used in the planning and optimization of cell and RNC consists of:
Electronics and Telecommunications ICRAMET 2014
Batam – Indonesia | 7 – 8 May 2014
ICRAMET
109 Accessebility
Retainability Mobility
2.4.1Accessebility
Accessebility is the user s ability to obtain appropriate services with the services provided by the system. These
parameters were obtained from the existing counter value on the site and be a value calculated at the RNC parameters -
parameters that exist on accessability. The parameters included in the category of accessibility is the RRC SR Radio
Research Control Success Rate, CSSR CS Call Setup Success Rate Circuit switch, CSSR PS Call Setup Success
Rate Packet Switch, CSSR HSDPA Call Setup Success Rate High Speed Downlink Packet Access.
• Radio Control Research Success Rate RRC SR, this parameter can be used to evaluate the success of signaling that
the user is done . • Call Setup Success Rate Circuit Switch CSSR CS, this
parameter is used to evaluate the success of the user occupying channel for circuit-switched services until the user
terminates the conversation . • Call Setup Success Rate Packet Switch CSSR PS, this
parameter is used to evaluate the success of the user occupying channel for packet switch services to the user to
terminate the call . • Call Setup Success Rate High Speed Downlink Access
CSSR HSDPA, this parameter is used to evaluate the success of a user in a channel occupied by the HSDPA service
user to terminate a call on the services used . 2.4.2. Retainability
Retainability is the users ability to maintain the service after the service successfully obtained until the time of service
is terminated by the user.These parameters were obtained from the existing counter value on the site and be a value
calculated at the RNC parameters - parameters that exist in the retainability. The parameters included in the category of
retainability is Call Drop Rate CS CDR CS, CDR PS, CDR HSDPA
• Call Drop Rate Circuit Switch CS CDR, this parameter is used to evaluate the call failed on circuit switched services in
one RNC. • Call Drop Rate Packet Switch CDR PS, this parameter can
be used to evaluate the ratio of failed calls that exist in the service packet switch in the RNC.
• Call Drop Rate HSDPA CDRHSDPA, this parameter can be used to evaluate the ratio of calls that failed in service on
HSDPA packet switch in the RNC. 2.4.3 Mobilty
Mobility is a measurement of the degree of success obtained in spite of the current service users in motion. Some
of the parameters that fall into the category of mobility is the Soft Handover Success Rate SHO SR, Inter System
Handover Circuit Switch ISHO CS, Inter System Handover Packet Switch ISHO PS.
• SHO Success Rate, this KPI parameters can be used to evaluate the success rate of the Soft Handover in a different
site, including softer handover. • ISHO CS, this KPI parameters can be used to evaluate the
success rate of service handover circuit switch for 2 different technologies.
• ISHO PS, this KPI parameters can be used to evaluate the success rate of service handover packet switch for 2 different
technologies. 2.5. Congestion parameter analysis
Congestion is an excess capacity of a data communication path or a telecommunications service. This condition occurs
when packets are transmitted through the network approaches the packet handling capacity of the network. When had
indicated there is congestion, then this will affect the decline in the value of the parameter associated with the KPI
accessability capacity of a system. For the capacity of the system, can be seen by power, code, channel element, and
IUB. There are several parameters that will dianalasis congestion on UMTS networks, namely:
Power Congestion Power congestion is excess capacity allocation system that
occurs in the power supplied. Power congestion can be seen from both directions, ie for downlink and uplink. Power
