Umts Radio Network Kpi

8/10/2019 Umts Radio Network Kpi

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UMTS Radio Network KPI

Content

KPI Classification

RAN KPI Definition and MeasurementKPI OptimizationKPI monitor

KPI Classification

KPI Overview (RAN) Mobile Network Element Management System is Element Management System ofoperation and management for one or more NEs. (FM, PM, CM)

Performance Monitor (according to the importance and usage):

KPI

PI: Performance Indicator

SPI: statistical performance indicator: with statistical rule such as call completion rategreater than 95%.

Customized performance index

KPI Monitor Tools:

Performance management

Fault Management

Configuration Management

RAN KPI Category
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RAN KPI Definition and Measurement

Coverage Probability
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Coverage Probability

RRC Establishment Success Rate
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Radio Access Success Rate

Radio access success rate = RRC establishment success rate RAB establishment successrate

This formula indicates that RRC establishment rate and RAB establishment rate need to beconsidered in the background statistics.
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RRC establishment success rate = Number of successful RRC connection setup times of each

cell / Number of RRC connection request times of each cell 100

Note: related with services (RRC connection)

RAB establishment success rate = Number of successful RAB establishment times / Number ofRAB establishment attempts 100%

RAB establishment success rate is categorized by service.

Access Success Rate Analysis Process

Access Failure Caused by RAB Establishment Failure There are two restraints in RAB establishment process. One is RB establishment which is the UEconfiguration process (usually no problems occur in this process); and the other is radio link re-configuration process in which NodeB links are configured. Failures often occur in the latter process. Theusual causes for these failures include radio link re-configuration preparation failure (it occurs whenproblems occur in NodeB resources.), and radio link re-configuration cancellation (it occurs when
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problems occur in RNC internal resources or process). Another factor may also cause RAB failures, thatis, when the load of a cell is relatively heavy, RNC sends out a reject command via admission control.

Call Drop Optimization

Handover Success Rate Optimization

Factors affecting handover success rate

Handover area is too small, so that UEs have not enough time to complete handover.

Handover parameters are wrongly set, so that neighbor cells cannot be added or deletedtimely, or causing ping-pong handover.

Neighbor cells are not configured. This may cause damage to the network, not onlydirectly causing call drop, but also brings extra interference towards the network.
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KPI monitorResource KPI monitor

One reason for resource limitation is number of 3G user increase, and operator changing feedecrease also lead to the increase of average erlang. The other reason is the strategy for design is focuson user feeling and KPI but not system capacity. For example HK user average Erl cold be up to 0.5E.

Single user erlang could be 0.45erl on BH
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Resource KPI and threshold.

Resource KPI mainly include DL power, UL capacity, code resource and CE resource.

DL power monitor
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DL power monitor

Modify reserve HSDPA power according to system algorithm.

MinHsdpaPowerMinHspaPwrRto+NoHsPower >Node B admission threshold

MinHsdpaPower stands for HSDPA reserved power DL congestion control will start (downgrade DL

DCH rate)MinHspaPwrRto default value is 20%.
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DL power monitor

Because high load cell often be with high admission failure, normally we should fast downgradeto release radio resource ASAP. Avoid handover user could not handover in the cell then call

dropped.(this action is only take effect in cell with much more PS users, if all users in the cell is in CSservice. It will not take effect).

Through decrease DL Eb/No could lead to reduced congestion. While we need detailed

evaluation to avoid some other bad effect. Table showed record for the modification, and can be consideras the reference. ZTE engineering experience showed downgrade Eb/No for 13.6K signaling channelcould reduce TCP limitation effectively, while the performance of access will not be affect so much.

UL capacity monitor

Call drop rate increasing not means UL capacity limitation, but call drop increasing is the mostcommon scene for limitation. Because call drop rate is most cared KPI, and be observed every day.
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RTWP increasing is the most directly representation for UL limitation, while sometimes reason forRTWP increasing could be external interference. And its hard to eliminate this reason.

Erlang is determining factor for UL limitation either. There are many factors related to the erlangof a cell. Normally we should care for cell capacity, if erlang in a cell exceed 20 erlang in BH.
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UL Power control parameter modification. The quality of users will be down as a consequent ofcapacity increasing. Optimization will do trade-off between capacity and quality.

Through UL power control parameter optimization we can improve RTWP increasing, but somecells will be in trouble for user increasing. And further modification to SIRtarget will affect subscriberfeeling. For this case ZTE suggest to define another set of power control parameter which is special forthese high load cells. The following table is comparison of parameters for special site and parameters fornormal site.
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Code resource monitor

Through observing "Number of rejected services, DCH no code we could know cell is in codelimitation. Also average code resource usage and HSDPA user number could be factor for

determination and optimization. We could modify the code allocation to reduce code limitation. OcuRateNoHspdsch+OcuRateHspdsch+DpchCodeHy+32512 formula 2

OcuRateHspdsch is the number of code (SF=512) which is blocked by the codeoccupied by HS-PDSCH channel.

OcuRateNoHspdsch is the number of code (SF=512) which is blocked by the codeoccupied by not HS-PDSCH channel.

DpchCodeHy is the number of code (SF=512) reserved for DPCH channel.

CodeUptHyA is the threshold to determine if we need decrease HS-PDSCH channelnumber.

When formula1 is fulfilled NO. of HS-PDSCH +1.

When formula 2 is fulfilled NO. of HS-PDSCH -1. To assure R99 user accessibility, the modification is apply.
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Umts Radio Network Kpi

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