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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
HUAWEI Confidential
Security Level:
UMTS statistics KPI Training
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 2
Performance measurement defn. of
3GPP
Accessibility KPI
Retainability KPI
Mobility KPI
Traffic (erlang / data
volume/throughput)
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 3
Performance measurement & KPI in 3GPP
Performance measurements are collected by network elements throughout
the network and 3GPP has defined many (hundreds) of standardized
measurements in the TS 52.402 and 32.4xx series specifications.
To date KPIs have not been standardized across equipment vendors, this
makes it difficult for operators with multiple vendors to easily calculate
network wide KPIs.
Typically equipment vendors/operators will aggregate and combines some
of the measurement and use them to compute some KPIs.
A generalized KPI formula is available in technical report of 3GPP which
uses measurements specified in technical specifications.
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 4
Performance measurement defn. of 3GPP TS
3GPP has not defined any Key Performance Indicators
However there are definitions of performance related data
They cover two major groups of performance related data
1.Radio related measurement
2 .Protocol events counter
Performance measurement definition in 3GPP TS defines all tasks for measurement job administration
1.e.g. the start and stop of measurement procedures and how the measurement jobs are intialised,modified & terminated.
2.Max/min/average value of response time measurements & when cumulative counter need to reset
All in all, the standard document gives a good overview on how to store and transport performance data that is already available, but it says nothing about how to compute and analyze it.
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 5
UTRAN KPIs described in 3GPP TR 32.814
The below KPIs are formulated as a cooperative effort by eight equipment vendor for 3GGP technical report 32.814 V.7.0.0
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 6
User experience
What do user recognize when they use network services?
It is a fact that the subscribers experience – often called user perceived
quality of service is a key factor of business success.
Negative user perceived impression
1. Subscribers are not able to register to the network.
2. Subscribers are not able to setup calls.
3. The calls made are dropped before the called or calling party hangs up.
4. Poor information transmission speed.
5. The quality of transmitted information is bad.
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 7
Accessibility KPI
KPI:
RRC setup success ratio
RAB setup success ratio
Granularity could be on each type of service of CS and PS:
Conversational (e.g. voice and video)
Streaming (e.g. streaming video or audio)
Interactive (e.g. browsing)
Background (e.g. emails or file download)
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 8
Forward
In WCDMA Signaling procedure, a complete access process
contains following steps:
RRC Establishment
Initial DT
Authentication
Security mode
RAB Assignment
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 9
Definition:
RRC Connection Setup Success Rate = RRC connection Success / RRC
Connection Request ×100%
RRC setup request mainly have the following causes 1 ) ( Originating Conversational Call ) 2 ) ( Originating Streaming Call ) 3 ) ( Originating Interactive Call ) 4 ) ( Originating Background Call ) 5 ) ( Originating Subscribed traffic Call ) 6 ) ( Terminating Conversational Call ) 7 ) ( Terminating Streaming Call ) 8 ) ( Terminating Interactive Call ) 9 ) ( Terminating Background Call ) 10 ) ( Emergency Call ) 11 ) ( Call re-establishment )
RRC Connection setup success rate
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 10
RRC Connection attempts & Success rate
WE use the below KPI’s with respect to RRC connection
Total RRC connection attempts & Success rate
Speech RRC attempts & Success rate
Vp RRC Attempts & Success rate
PS interactive RRC attempts & Success Rate
Note: For Speech & Vp RRC connection Attempts & Success rate is not possible
instead we can provide Conversational class RRC attempts & Success rate as
per standards as it is not possible to distinguish video & voice attempts in RRC
connection request phase as we get the establishment cause value for both
voice and video as Conversation class.
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 11
RRC setup success ratio
UE SRNCNodeB
RRC RRCRRC Connection Request
RRC
RRC
Assign RNTI, L1, L2 Parameter
RRC
AAL2 Setup and FP synchronization
RRC Connection Setup
RRCRRC Connection Setup Complete
RRC setup procedure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 12
RRC setup success ratio Possible failure causes:
UE does not receive the RRC setup message from RNC
RNC does not receive the RRC setup complete message
RRC rejected due to congestion
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 13
RAB Establishment KPI
We have got two KPI with respect RAB Establishment for different scenario like
speech,CS64,PS interactive & PS streaming,
RAB attempts
RAB Establishment success rate
RAB Attempts:
Measurement point: received numbers of RABs to be setup for service “X” in message
RANAP RAB ASSIGNMENT REQUEST.
RAB Establishment Success Rate:
− Measurement point: the numbers of successful RABs setup for service “X”
in message RANAP RAB ASSIGNMENT RESPONSE
Service type:
− Conversional, streaming, interactive, background
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 14
RAB setup success ratio
UE SRNCNodeB CN
RANAP RANAPRAB Assignment Request
ALCAP Iu Data Transport Bearer Setup
RRCRRC
RRC
RB Setup
RRCRB Setup Complete
RANAP RANAPRAB Assignment Response
NBAP RRCRL Reconfig Prepare
NBAP NBAP
NBAP NBAP
ALCAP Iub Data Transport Bearer Setup
RL Reconfig Ready
RL Reconfig Commit
RAB setup procedure ( DCH-DCH, synchronized )
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 15
RAB setup success ratio
Formula :
RAB Setup success rate (Service “X”) = RAB Setup success(Service
“X”)/RAB Setup attempts Service “X”)
Service “X” can be of different Qos & service rate namely
Conversational( Voice & video)
Streaming services with rates of 32K,64K,144K,384K
interactive services with rate of 32K,64K,144K,384K
Background services with rates of 32K,64K,144K,384K
HSDPA & HSUPA.
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 16
RAB setup success ratio Possible failure causes:
CN send RAB assignment req, but UE does not receive RB setup
message (due to congestion, high BLER, etc)
UE recieves RB Setup but RNC does not receive RB setup
complete
Resource unavailable
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 17
Accessibility
Call drop
Congestion
Handover
Traffic erlang / throughput
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 18
Call drop rate & Retainability KPI
Definition:
Call drop ratio = A/(A+B)
A= Number RAB released Abnormally
B = Number of RAB released Normally
Retainability of “X” service = (1- call drop ratio of “X” service)*100
Speech minutes per drop =GP in minute *Erl_Speech/Number of RAB released
abnormally
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 19
Call drop analysis procedureNormal RAB Release scenario’s
Generally the release of RAB or Iu is triggered by CN,However in the following conditions the RNC triggers the RAB or Iu release,
RNC may trigger RAB release after “PS inactive detecting timer” expires
RNC may trigger Iu release after an inter RNC handover
UE request RNC to release RRC,then RNC may trigger Iu release (Blackberry UE)
Abnormal RAB Release Procedure can subdivided into
RF reasons
Non RF reason
RF Reason:
If RNC send Iu release request message with release cause “Radio connection with UE lost” or Failure in the Radio interface procedure”
Non RF reason:
If RNC sends Iu release request message with cause value of “abnormal release” which could have happened due AAL2 link failure or Iu link failure or abnormal UE
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 20
Signaling plane call drop
SRNC CN
RANAP RANAP
RANAP RANAP
RANAP RANAP
Iu Release Request
Iu Release Command
Iu Release Complete
Signaling procedure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 21
Signaling plane call drop
Possible causes for Iu Release Request message:
O&M interfere
User inactivity
Integrity protection failure
Radio link failure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 22
User plane call drop
UE SRNC CN
RANAP
RANAP RANAP
SRNC Identities that the RAB need to be released
RANAPRANAP
RRC
RANAP
RAB Release Request
Iu Release Command
ALCAP Iu Bearer Release
RANAP Iu Release Complete
RRC
RRC RRC
RRC Connection Release
RRC Connection Release Complete
Signaling procedure:
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 23
User plane call drop
Possible causes:
L2 resource abnormal, (e.g.: DSP failure)
Transport resource unavailable
RLC reset due to bad radio link
RL failure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 24
Accessibility
Call drop
Congestion
Mobility
Traffic erlang / throughput
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 25
SHO success ratio
Definition:
A : Numbers of ActiveSet Update Complete message
RNC received
B : Number of ActiveSet Update Command RNC send
%100B
AerSuccRateSoftHandov
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 26
SHO success ratio
UE New NodeB SRNC
NBAP NBAP
Decide to setup new RL
ALCAP Iub Data Transport Bearer Setup
NBAP NBAP
RRC RRC
RRCRRC DCCH : Active Set Update Complete
Radio Link Addition Request
DCCH : Active Set Update Command
Radio Link Addition Response
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 27
SHO success ratio
UE New NodeB SRNC
NBAP NBAP
Decide to setup new RL
ALCAP Iub Data Transport Bearer Setup
NBAP NBAP
RRC RRC
RRCRRC DCCH : Active Set Update Failure
Radio Link Addition Request
DCCH : Active Set Update Command
Radio Link Addition Response
Failure procedure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 28
SHO success ratio
Possible causes of SHO failure:
Active set update failure: :
− UE does not receive Active set update message
− UE does not send Active set update complete message
− RNC does not receive Active set update complete message
− RNC received Active set update failure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 29
HHO success ratio
Definition:
A : successful HHO
B : total numbers of HHO
%100B
AerSuccRateHardHandov
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 30
HHO success ratio
UE Target NodeBSource NodeB SRNC
Decide to handover
RRC
NBAPNBAP Radio Link Setup Request
ALCAP Iub Data Transport Bearer Setup
NBAP NBAPRadio Link Setup Reponse
RRCDCCH : Physical Channel Reconfiguration
NBAPNBAP Radio Link Failure Indication
RRC RRCDCCH : Physical Channel Reconfiguration Complete
NBAP NBAPRadio Link Deletion Request
NBAP NBAPRadio Link Delete Response
ALCAP Iub Data Transport Bearer Release
Successful procedure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 31
HHO success ratio
UETarget NodeB
(Incoming the Cell)Source NodeB
(Outgoing the Cell)
SRNC
Decide to handover
RRC
NBAPNBAP Radio Link Setup Request
ALCAP Iub Data Transport Bearer Setup
NBAP NBAPRadio Link Setup Reponse
RRCDCCH : Physical Channel Reconfiguration
NBAPNBAP Radio Link Failure Indication
RRC RRCDCCH : Physical Channel Reconfiguration Failure
NBAP NBAPRadio Link Deletion Request
NBAP NBAPRadio Link Delete Response
ALCAP Iub Data Transport Bearer Release
failure procedure
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 32
Accessibility
Call drop
Congestion
Handover
Traffic erlang / throughput
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 33
CS Traffic
CS traffic is measured in Erlang ( one12.2k CS AMR connection in one
hour is one erlang), other service should change to equivalent AMR
erlangs
CS service has 2 types:
CS conversational (for example: voice and video)
CS streaming (for example : streaming video /audio)
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 34
PS data throughput
We got traffic statistics indexes in our OSS reports for
Data volume for R99 services in DL & UL
HSDPA services
Services Throughput for R99 in DL & UL
HSDPA & HSUPA Services throughput
HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 35
Thank you