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7/30/2019 Csv Access Analysis
http://slidepdf.com/reader/full/csv-access-analysis 1/17
COPYRIGHT © 2011 ALCATEL-LUCENT. ALL RIGHTS RESERVED.
ALCATEL-LUCENT — INTERNAL PROPRIETARY — USE PURSUANT TO COMPANY INSTRUCTION
1
MANAGED
SERVICESDELIVERY
Access & IRAT Analysis-NE2nd August, 2013
July. 2013
7/30/2019 Csv Access Analysis
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COPYRIGHT © 2011 ALCATEL-LUCENT. ALL RIGHTS RESERVED.
ALCATEL-LUCENT — INTERNAL PROPRIETARY — USE PURSUANT TO COMPANY INSTRUCTION
2
CSV Access BBH & NBH Trend
95 of cells (20%) are not meeting the CSV access in BBH. Average CSV access at NBH is 95%
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3
CSV Access Failure Rate - BBH
CategoryLCV< 50
AttemptsInconsistent
UtilityTransport RF BSS
BB Issue DG Issue Misc
CSV Access Failure Reasons 73 5 3 7 1 4 1 1
% Of CSV Access Failure
Reasons76.84 5.26 3.16 7.37 1.05 4.21 1.05 1.05
95 cells (20%) are not meeting the CSV access in BBH. 35 cells having less than 20 Call
attempts in BBH.
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COPYRIGHT © 2011 ALCATEL-LUCENT. ALL RIGHTS RESERVED.
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4
CSV RRC & RAB Failure
RRC failures due to Radio Interface Synch, RI setup expiry, & time out of UU Interfaceand CS RAB failures due to radio Interface procedure, timeout of UU rb setup & RI
Setup or reconfig timeout are caused by BW congestion.
RRC failures due to RI setup fail & RAB failures due to RI setup or reconfig fail are
caused by high CE utlization. Case study shown In further slides.
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5
HSDPA+HSUPA+PS Access Trend BBH & NBH
Average 14% of cells are not meeting the HSDPA+HSUPA+PS access success rate in BBH
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6
PS Access Failure Rate - DBBH
CategoryLCV< 50
Attempts
Inconsisten
t
Utility
Transport RF BSS RCOMBB Issue DG Issue Misc
PS Access Failure Reasons 8 6 19 15 2 10 2 3 7
% of PS Access Failure
Reasons11.11 8.33 26.39 20.83 2.78 13.89 2.78 4.17 9.72
72 cells (18%) are not meeting the PS access in DBBH.
7/30/2019 Csv Access Analysis
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7
PS RAB Failure
PS RAB failures due to RI Setup or Reconfig timeout, Radio Interface Synch Procedure & timeoutof UU rb setup are caused by BW congestion.
PS RAB failures due to RI setup or reconfig fail & UE send rb setup failed are caused by high
CE utlization.Case study shown In further slides.
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8
IRAT BBH & NBH Trend
Average 91% of cells are not meeting IRAT in BBH. Average IRAT failure rate is 10% at NBH
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9
IRAT - NBH
GSMSites
3G Sites
CSV Call
Attempts
IRAT Attempts% of Call going in
IRAT
CSV Call
Attempts
IRAT Attempts% of Call going in
IRAT
24hrs 24hrs 24hrs NBH NBH NBH
722 161 202605 10574 5.2 11034 762 6.9
93% of cells having at most 5 IRAT attemtps in NBH. The maximum IRAT attempt is in a cell in
NBH is 23 .
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10
RRC Failure
RRC ACC FAIL DUE TO RADIO INT SYNCH
Description: The number of RRC access failures caused by radio interface synchronisation failure
When the RNC does not receive the RRC: RRC CONNECTION SETUP COMPLETE message from the
UE within 6 seconds, and the RNC has not received the NBAP message which indicates that L1
synchronisation has been established between UE and BTS. This counter is updated also in case of
inter-system handovers and inter-RNC hard handovers.
RRC ACC FAIL DUE TO RI SETUP FAIL
Description: The number of RRC access failures caused by radio interface setup fail
The major reasons for RRC access failures caused by radio interface setup fail is Black of HW
resources at NodeB, eg BPC (CE) card.
RRC ACC FAIL DUE TO RI SETUP EXPIRY
Description: The number of RRC access failures caused by radio interface setup expiry
The major reasons for RRC access failures caused by radio interface setup expiry is BW congestion &
Packetloss
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11
RRC Failure
RRC ACC FAIL DUE TO UU INT
Description: The number of RRC access failures caused by UE.
When the RNC does not receive the RRC: RRC CONNECTION SETUP COMPLETE message from the
UE within 6 seconds, and the RNC has received the NBAP message which indicates that L1
synchronisation has been established between UE and BTS. This counter is updated also in case of
incoming SRNS relocations, inter-system handovers, and inter-RNC hard handovers
RRC ACC FAIL DUE TO RNC INTER REASONS
Description: The number of RRC access failures caused by RNC internal reason.
When an RNC internal failure occurs before receiving the RRC: RRC CONNECTION SETUP
COMPLETE message from the UE. This counter is updated also in case of incoming SRNS relocations,
inter-system handovers, and inter-RNC hard handovers
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12
RRC Failure Due to RI Interface Synch
Case Study: To show the impact of BW congestion on RRC failures, due to Radio
Interface Synch & RI setup expiry
BW augumention (Asansol to Durgapur 3G Backhaul from 1xSTM1 to 2xSTM1) done
in RNC-33 of WB, on 24th showing reduction in failures, due to RI interface synch
& RI setup expiry
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13
RRC Failure Due To RI Setup Fail
Case Study: To show the impact of high CE utlization on RRC failures due to RI setup fail
Bangalipara site of WB was added with one additional BPC (CE) card on 28 th, after that
the number of failed RRC connection preparation,Due To Rl setup FAIL, has become
zero.
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14
RAB Failure in CS Domain
Case Study: To show the impact of BW congestion on RAB failures, due to Radio
Interface procedure & timeout of UU rb setup
RNC-33 of WB, BW augumention (Asansol to Durgapur 3G Backhaul from 1xSTM1 to 2xSTM1)
done on 24th after that, showing reduction in failures due to RI interface procedure & timeout
Of UU rb setup
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15
RAB Failure in CS Domain(CE Upgrdation)
Case Study: To show the impact of high CE utlization on RAB failure due to RL setup or reconfig
fail
CE (Card) upgrdation showing decrement in failures, due to RL setup or Rconfig Fail
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16
RAB Failure in PS Domain (BW Agumentation)
RNC-33 of WB, BW augumention (Asansol to Durgapur 3G Backhaul from 1xSTM1 to 2xSTM1)
done on 24th after that, showing reduction in failures due to RI interface procedure & timeout
Of UU rb setup
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Weekly Progress Report #1
COPYRIGHT © 2011 ALCATEL-LUCENT. ALL RIGHTS RESERVED.