LTE1196 RIM for WCDMA
RAN3086 CSFB with RIM
06-Sep-2020
1
© 2016 Nokia
Brief Introduction of LTE1196, RAN3086 and their parameters
Brief Description:
 RAN3086: CSFB with RIM feature introduces RAN Information Management (RIM) signalling support for circuit-switched call fallback (CSFB). With the
RIM procedure, LTE eNode B is able to retrieve 3G System Information (SI) from RNC. This improves the overall end-user experience by accelerating a
voice call setup time.
 LTE1196: Feature introduces possibility to define “UTRA SI” RIM application to transfer up-to-date System Information of WCDMA neighbor cells from
remote RNC to local eNB. After reception to eNB, they can be used to populate WCDMA System Information for redirection to WCDMA procedure.
Below 1 sites considered for trial (on both 3G and LTE):
 Performance Summary:
 Trial implemented on 9-Nov on 1 sites.
 Feature is activated and working, RIM container is visible
from L3 messages.
 Testing performed on 1 sites at same location during pre
and post.
Following parameter set modified:
MO
RNFC
WCEL_SIB
LNBTS
Core
Proposed Value
1
1
1
On
Parameter ID
Parameter name
Default
002:2306
CSFB_WITH_RIM
0000H
Remarks
SIB11 never included in System Information Container to LTE
Maximum number of simultaneous RIM messages sent out from
RNC .is 400
0H
-100 dBm : UL interference value that RNC uses in RIM procedure
as a fixed value Access Class Restriction Information is included in
System Information Container to LTE.
002:2152
2
Parameter Name
RIMUtraSIEnab
DefMeasCtrlReading
actRIMforUTRAN
rim_transfer
© 2016 Nokia
RU40_MAINT_56
 Average 0.7 ms CSFB time reduced on site.
 CSFB attempts on LTE and CSFB RRC setup SR on 3G are
stable.
Feature verification from Drive Test
Pre
Post
Post enabling feature, its is
observed from post drive test
that after Extended Service
Request and during RRC
connection Release, UE is being
sent 3G SIB in utra-BCCHContainer.
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© 2016 Nokia
CSFB setup time results from Drive Test
Pre
Message
Date
1
2
3
4
5
6
7
8
9
10
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Dec/10/19
Time
8:41:18 PM
8:43:06 PM
8:44:56 PM
8:46:47 PM
8:47:29 PM
8:48:36 PM
8:50:26 PM
8:52:17 PM
8:54:46 PM
8:55:56 PM
Post
Longitude Latitude Voice_Call_SetupTime
25.85597
25.85593
25.85602
25.85603
25.85603
25.85604
25.85604
25.85602
25.85604
25.85608
-17.8483
-17.8483
-17.8483
-17.8482
-17.8482
-17.8482
-17.8482
-17.8482
-17.8482
-17.8483
Message
Date
1Dec/09/2019
2Dec/09/2019
3Dec/09/2019
4Dec/09/2019
5Dec/09/2019
6Dec/09/2019
7Dec/09/2019
8Dec/09/2019
9Dec/09/2019
10Dec/09/2019
8039
2033
6116
2273
2235
6580
2033
6858
1901
6543
4461.1
Average Call Setp Time
Site Name
Pre
Post
Improvement
ZM-0121 Livingstone Rlf
4.4
3.7
0.7
Average 0.7 ms CSFB time reduced on ZM0121 Livingstone Rlf
4
© 2016 Nokia
Time
Longitude
9:54:35 PM 25.8562
9:56:25 PM 25.85621
9:58:14 PM 25.85623
10:01:19 PM 25.8556
10:03:11 PM 25.85542
10:05:00 PM 25.85511
10:06:49 PM 25.8554
10:08:37 PM 25.85545
10:10:27 PM 25.85589
10:12:15 PM 25.85636
Latitude
-17.8486
-17.84861
-17.84853
-17.84848
-17.84866
-17.84912
-17.8498
-17.84977
-17.84964
-17.84914
Average Time
Voice_Call_SetupTi
me
5712
2969
3539
3194
5281
3638
3247
3281
3479
3639
3797.9
Thanks
5
© 2016 Nokia