access analysis

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1

CSV Access BBH & NBH Trend

95 of cells (20%) are not meeting the CSV access in BBH. Average CSV access at NBH is 95%


2

CSV Access Failure Rate - BBH

CategoryLCV< 50 Attempts

Inconsistent

UtilityTransport RF BSS

BB Issue DG Issue Misc

CSV Access Failure Reasons

73 5 3 7 1 4 1 1

% Of CSV Access Failure Reasons

76.84 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.


3

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.


4

HSDPA+HSUPA+PS Access Trend BBH & NBH

Average 14% of cells are not meeting the HSDPA+HSUPA+PS access success rate in BBH


5

PS Access Failure Rate - DBBH

CategoryLCV< 50 Attempts

Inconsistent

Utility

Transport RF BSS RCOM

BB Issue DG Issue Misc

PS Access Failure Reasons

8 6 19 15 2 10 2 3 7

% of PS Access Failure Reasons

11.11 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.


6

PS RAB Failure

PS RAB failures due to RI Setup or Reconfig timeout, Radio Interface Synch Procedure & timeout of 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.


7

IRAT BBH & NBH Trend

Average 91% of cells are not meeting IRAT in BBH. Average IRAT failure rate is 10% at NBH


8

IRAT - NBH

GSM Sites

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 .


9

RRC FailureRRC 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


10

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


11

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) donein RNC-33 of WB, on 24th showing reduction in failures, due to RI interface synch & RI setup expiry


12

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.


13

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 & timeoutOf UU rb setup


14

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


15

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 & timeoutOf UU rb setup

Weekly Progress Report #1


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