Huawei:
CDR = (Call Drops on Radio Interface in Stable State (Traffic
Channel) + Call Drops on Radio Interface in Handover State (Traffic
Channel) + Call Drops due to No MRs from MS for a Long Time
(Traffic Channel) + Call Drops due to Abis Terrestrial Link Failure
(Traffic Channel) + Call Drops due to Equipment Failure (Traffic
Channel) + Call Drops due to Forced Handover (Traffic Channel)) /
(Successful TCH Seizures (Traffic Channel)) * 100CSSR = (Success
Rate of TCH Assignment*Success Rate of Call Setup (Immediate
Assignment)/10000)*100
ALCATEL:
CDR = Total TCH Drops / [Total TCH Seizures - (Successful HO
Out) - (Successful Intracell HO)]= MC736+MC621+MC14c+MC739+MC921c)
/ ((MC717a + MC717b) + (MC718) - (MC712))
CSSR= SDCCH Assignment Success Rate * TCH Assignment Success
Rate or =(1-SDCCH drop rate)*(1-TCH congestion rate)*(1-TCH
assignment failure rate)= [1-([(MC138+MC07+MC137)] /
[(MC01+MC02)])] * [1-([(MC140a- (MC142e+MC142f)- MC718] / [MC140a-
(MC142e+MC142f)])]
ZTE:CDR=Total TCH Drops / [Total TCH Seizures - (Successful HO
Out) - (Successful Intracell HO)]=
C11615/[(C11657+C11659+C11921+C11923+C11667)-(C11669)]CSSR= SDCCH
Assignment Success Rate * TCH Assignment Success Rate or =(1-SDCCH
drop rate)*(1-TCH congestion rate)*(1-TCH assignment failure
rate)=(1-C11605*100/(C11625+C11696))(1-(C11610-C11697)*100/(C11609-C11696))(1-C11657*100/(C11657+C11658))
ERICSSON:
For CDR forlmula for TCH Drops is given below.
Description:This gives percentage TCH dropped Connections of
total no of TCH connections terminated in a cell.
CSSR as single KPI is not available for Ericsson, though
constituents are available.
Similar Threads: poor CSSR in Huawei Bsc sts user-formulas High
gap CSSR between 1st and 2nd carrier Telecom market comparison: Why
equipment vendors prefer U.S. and not India Formulas for db
conversions
-------------------------------------------------------------------------------------------------------------------------------TCH
assignment success rate is low for network, all of sudden we are
facing problem for all the BSC can anyone help regarding
thisIntelecommunications, thecall setup success rate(CSSR) is the
fraction of the attempts to make acallthat result in aconnectionto
the dialled number (due to various reasons not all call attempts
end with a connection to the dialled number). This fraction is
usually measured as a percentage of all call attempts made.In
telecommunications acall attemptinvokes acall setupprocedure,
which, if successful, results in aconnected call. A call setup
procedure may fail due to a number of technical reasons. Such calls
are classified asfailed call attempts. In many practical cases this
definition needs to be further expanded with a number of detailed
specifications describing which calls exactly are counted as
successfully set up and which not. This is determined to a great
degree by the stage of the call setup procedure at which a call is
counted as connected. In moderntelecommunication systems, such
ascellular (mobile) networks, the call setup procedure maybe very
complex and the point at which a call is considered successfully
connected may be defined in a number of ways, thus influencing the
way the call setup success rate is calculated. If a call is
connected successfully but the dialled number is busy, the call is
counted as successful.Another term, used to denote call attempts
which fail during the call setup procedure, isblocked calls.The
call setup success rate in conventional (so-calledland-line)
networks is extremely high and is significantly above 99.9%. In
mobile communication systems using radio channels the call setup
success rate is lower and may range for commercial networks between
90% and 98% or higher. The main reasons for unsuccessful call
setups in mobile networks are lack ofradio coverage(either in
thedownlinkor theuplink),radio interferencebetween different
subscribers, imperfections in the functioning of the network (such
as failed call setup redirect procedures), overload of the
different elements of the network (such as cells), etc.The call
setup success rate is one of the key performance indicators (KPI)
used by the network operators to assess the performance of their
networks. It is assumed to have direct influence on the customer
satisfaction with the service provided by the network and its
operator. The call setup success rate is usually included, together
with other technical parameters of the network, in a key
performance indicator known asservice accessibility.The operators
of telecommunication networks aim at increasing the call setup
success rate as much as practical and affordable. In mobile
networks this is achieved by improving radio coverage, expanding
the capacity of the network and optimising the performance of its
elements, all of which may require considerable effort and
significant investments on the part of the network operator.This
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