Telecommunication Key Performance Indicators

1. KPI
Key Performance Indicator
In
Telecommunication

2. ERLANG
 The amount of traffic is expressed in ERALNG, which is the magnitude of the
telecom traffic.

3. INTERFERENCE
 The dilemma of frequency planning is provide the needed capacity/coverage
within a limited band.The frequency channels therefore need to be re used but it
is wise not to increase the interference level. Interference is cause when two
network cells use the same channel too close to each other.
 Inference can be-
 Internal interference: with same network
 External Interference: with other network
 Other interference: with other devices

4. RADIO ACCESS NETWORK QUALITY
IMPROVEMENT AND GUIDELINES

5. ACCESSIBILITY
 Service accessibility is:The ability of a service to be obtained, requested by the
user.
 Listed below are the KPIs connected to accessibility.

6. PAGING SUCCESS RATE
 The paging success rate measures the percentage of how many paging attempts
that have been answered, either as a result of the first or the second repeated
page.
Possible reasons for poor paging performance could be:
 Paging congestion in MSC, BSC and MSC/MSS
 Poor paging strategy
 Poor parameter setting
 Poor coverage or High interference

7. SDCCH ACCESS SUCCESS RATE
SDCCH Access success rate is a percentage of all SDCCH accesses received in the
BSC.
Possible reasons for poor SDCCH access performance could be
 Too high timing advance( MHT)
 Access burst from another co-channel, co-BSIC Cell
 Congestion
 False accesses due to high noise floor
 Unknown access cause code

8. SDCCH DROP RATE
The SDCCH drop rate statistic compares the total number of RF losses(While using
an SDCCH), as a percentage of the total number of call attempts for SDCCH
channels.
Possible reasons for SDCCH Drop rate could be
 Low signal strength on downlink or uplink
 Poor quality on downlink or uplink
 Too high timing advance
 Congestion onTCH

9. CALL SETUP SUCCESS RATE(CSSR)
 The call setup success rate measures successfulTCH assignments of total number
ofTCH assignment attempts.
* CR is congestion rate
*ASR is assignment success rate
Reason for low call setup success rate (CSSR)
 TCH Congestion
 Interference or poor coverage

10. CALL SETUPTCH CONGESTION RATE
 The call setupTCH congestion rate statistic provides the percentage of attempts to allocate aTCH call
setup that was blocked in a cell.
Possible reasons for call setup Block could be
 IncreasingTraffic demand
 Bad dimensioning
 HighAntenna Position
 High Mean HoldingTime (MHT)
 Low Handover Activity
 Congestion in surrounding cell

11. RETAINABILITY
 The service retains ability is “The ability of a service, once obtained, to continue
to be provided under given conditions for a requested durations.
 Listed below are the KPIs connected to retain the ability.

12. CALL DROP RATE (CDR)
 This KPI gives the rate of drop call. Percent ofTCH dropped afterTCH assignment
complete.
 DR is directed retry (paging from HLR to MS)
 AS is assignment success

13. CDR
Possible reason for Call Drop Rate
 Low signal strength on uplink or downlink
 Lack of best server
 Congestion on neighboring cells
 Battery flaws
 Poor quality on downlink or uplink
 Too high timing advance
 Antenna problems
 Low BTS output power
 Missing neighboring cell definitions
 Unsuccessful outgoing and/or incoming handover

14. HOSR (HANDOVER SUCCESS RATE)
 The handover success rate shows the percentage of successful handover of all
handover attempts.A handover attempts is when a handover command is sent to
the mobile.
 Possible reasons for the poor handover success rate could be-
 Congestion
 Link connection
 Bad antenna installation
 The MS measures signal strength of another co-or adjacent cell than presumed
 Incorrect handover relations

15. HOSR
 Incorrect locating parameter settings
 Bad radio coverage
 High interference, co-channel or adjacent
There are two type of HOSR Failure
1. Incoming Handover Failure- Incoming hand over failure observed.There is
problem at main site.
2. Outgoing Handover Failure- Outgoing handover calls failure, means there are
problem with the neighboring cells.