Upload
phenom1979
View
493
Download
10
Embed Size (px)
Citation preview
3G to 2G Handover Presentation
July 10, 2006
Page 2
Current Setting
GSM
UMTS
IdleQsearch_I = AlwaysFDD Qmin = -13
DedicatedNot Allowed
IdleEcIoSsearchRAT = 4 (-14)
DedicatedRSCPthrown_3a = -100 dBmthrooth_3a = -100 dBmthruf_2dug = -97 dBmthruf_2f = -94 dBm
Page 3
Makati-Mandaluyong-Pioneer
Poor Coverage &No Dominant Server.
Need to improve coverage
In Dedicated Mode, UE fall below -100 dBm in 2 sample. Trigger point from 3G to 2G <
-100 dBm.
In Idle Mode, EcIo still better than -14 even in low RSCP.
Hence no 3G to 2G cell reselection
Page 4
Makati- Mandaluyong Bridge
No Handover from 3G to 2G. Served by Rockwell2Missing 3G to 2G neighbors
Page 5
Makati- Mandaluyong Bridge (DT Logs)
UE already verified BSIC and Trigger Event 3a, however no reply from network.Need to perform IMSI trace for troubleshooting. Suspect similar problem with BPI
Page 6
Buendia Avenue
Page 7
Flyover Bridge from The Fort to Edsa
Page 8
Burgos Street Makati
Page 9
Poor Inter-RAT Handover SR
From statistics, 100% PS inter-RAT handover failure rateBPI, SAMAT, CUPANG – chosen for troubleshootingSAMAT – KPI : InterRAT HOSR CS = 75%, PS = 0%
Page 10
Drive Test Result - SAMAT
From DT, PS Inter-RAT HO is successfulReply from TAC3 Munich -------- > Suspect Statistics Counter Problem
Page 11
BPI Buendia
100% inter-RAT HO Failure CSDrive Test and IMSI Trace was conducted for troubleshootingResults of Trace : Core Network sending RANAP relocation failure with cause value o&minterventionEscalated to Core for troubleshootingVery Poor 3G Coverage.
No Outdoor Sites, current serve by BPI indoor.
Outdoor 3G node B required.NO 3G to 2G handover
Page 12
BPI Buendia IMSI Trace
Page 13
Action Plan
CS Inter-RAT HO- Define additional 3G to 2G neighbors list ( Done-
pending database execution)- Perform K12 & IMSI trace for Rockwell &
Mckinley- Re-verify with Drive Test and Statistics - Coordinate with Core on the signaling issue (BPI
Buendia)PS Inter-RAT HO
- Iu (RNC-SGSN) and Iub signaling trace will be conducted this week
- Issue escalated to Siemens TAC3- From DT, the result is ok- Suspect KPI counter problem (TAC3)
Page 14
Propose New Setting
GSM
UMTS
IdleQsearch_I = AlwaysFDD Qmin = -13 -> -11
DedicatedNot Allowed
IdleEcIoSsearchRAT = 4 (-14) -> 6 (-12)
DedicatedRSCPthrown_3a = -100 dBm -> - 97throoth_3a = -100 dBm -> - 95thruf_2dug = -97 dBm -> -94thruf_2f = -94 dBm -> -90
Page 15
Pro & Con
PRO : - Faster Handover/Cell reselection from 3G to 2G- Reduce missing neighbors problem due to
overshoot serving of 3G- Better 3G KPI
CON : - 3G coverage shrink- Non Continuous 3G coverage