kts lr14.2w 170715 fast return to lte improvement sep...

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KTS LR14.2W 170715 Fast Return to LTE improvementSep 8th 2015

NEA/TIS – Jean-Noël CHARNEAU/Boubacar COULIBALY/Sophie PIEKAREC


Agenda

1. Feature Description

2. Interactions with other features and Upgrade rules

3. Activation Strategy in ORF Network

4. Assessment – Fast Return Time

5. Assessment - Performance

6. Lessons learned from Call Trace

7. Limitations

8. Conclusion

ANNEX – Tests

ANNEX - AR1-5624148 analysis


Feature Description1


Avoid detecting CSFB when UE is redirected by eNodeB to UTRAN for another reason than CSFB

o Radio problem (entering coverage alarm, below serving floor)o Offload reason (reactive load control, preventive load control)

Detect CSFB when UE provides both “Pre-redirection Info” and “CSFB Indication” IE in RRC CONNECTION REQUEST

Feature Objectives


• Purpose of UA8.1 PM134661 is to send UE back to LTE at CS call completion after RNC has detected that UE has connected for a CSFB reason• CSFB is detected by RNC if « Pre-redirection Info » is not present in RRC CONNECTION REQUEST

170715 is based on UA8.1 134661

If UE is LTE capable:

CsfbDetection is set to TRUE

CSFB detection is based on the absence of

« Pre-Redirection info » IE at RRC connection

Detection of fake CSFB If UE redirected by LTE for radio or load

reason

3GPP 9.4+ : UE shall not include « Pre-redirection Info »

in RRC CONNECTION REQUEST if redirected by LTE

Side effect: UE Fast Returned to LTE if CS call is setup

VS.CsfbDetectionInRrcConn++


• CSFB is detected by RNC if optional « CSFB Indication » IE is present in RRC CONNECTION REQUEST

170715 added value

UE CSFB detection is based on the presence of « CSFB Indication » IE at RRC connection

Risk of non detection of true CSFB if UE not supporting « CSFB Indication »

3GPP 9.11+: UE should include « CSFB Indication » in RRC CONNECTION REQUEST if redirected by LTE for

CSFB

Side effect: UE not Fast Returned to LTE at CS call release

If UE is LTE capable:

CsfbDetection is set to TRUE

VS.CsfbDetectionInRrcConn++


Impact on CSFB Detection at RNC LTE -> 3G redirections

CSFB Non-CSFB (radio, offload)

No Pre-redirection Pre-redirection Info

No Pre-redirection Info Pre-redirection Info

CSFB Indication

No CSFB IndicationNo CSFB Indication (B)

CSFB Indication (C)

CSFB Detection based on« Pre-redirection Info » not present

« CSFB Indication » present

LTE

3G

CS Speech call (A)

No CS Speech call

A- Call is not a CS fallback, and 134661 feature mistakenly fast returns the UEB- UE does not support“CSFB Indication”, and 170715 does not fast return the UEC- UE provides both “Pre-redirection Info” & “CSFB Indication”, and 170715 fast returns the UE where 134661 does not


GainFeature Pros & Cons

[1] Actual Support of “CSFB Indication” IE is not know by RNC since it is an Optional R9 IE. Field observation showed that some R9 UE don’t support it but also some R8 UE support it.

UE Types [1]CSFB Indication presence

Pre-Redirection Info present

134661(csfbDetectionMethod= CsfbDeduction)

170715(csfbDetectionMethod= CsfbIndication)

Comments

1

supports CSFB indication

Yes No Redirect Redirect Common CSFB scenario of R9 UE.

Most of R8 UE performs also this CSFB scenario.

2 Yes No Redirect Redirect Few cases observed for both R8 and R9 UE CSFB.

3

No

No Redirect No Redirect

Not a CSFB scenario. Common scenario for non-CSFB redirections.Rare cases of speech call setup after a redirection from LTE has been performed for a non-CSFB cause (radio, ofload). Main improvement is regarding interpretation of CSFB detection counter.

4Yes No Redirect No Redirect Not a CSFB scenario.

Speech call setup scenario for UE camping on 3G.

5

does not support CSFB indication No

No Redirect No Redirect

Common scenario for non-CSFB redirections of R8 UE not supporting CSFB indication IE.Rare cases of R9 UE CSFB.Still observed for a significant part of R8 UE CSFB.

6Yes No Redirect No Redirect

Not a normal CSFB scenario. Speech call setup scenario for UE camping on 3G.Can correspond to a CSFB performed in poor radiio conditions.

Pros ConsGain is expected if feature is activated for R9 UE only (csfbDeductionAndIndication).


• “CSFB Indication” optional IE has been introduced in R9 version 11 therefore lots of R8 UE currently on the field don’t support it• Feature is designed to be able to activate feature in two steps

for R9+ UE only in a 1st step (the only step assessed in ORF FA) for any UE in a 2nd step (all UE supporting CSFB Indication IE)

Two steps activation of the feature

1st step

csfbDetectionMethodCSFB Detection at RNC

R8 UE R9+ UE

csfbDeduction "Pre-redirection Info" not present

"Pre-redirection Info" not present

csfbDeductionAndIndication

"Pre-redirection Info" not present

"CSFB Indication" present

csfbIndication "CSFB Indication" present

"CSFB Indication" present

2nd step

New parameter


Interactions with other features and Upgrade rules2


UA8 134661 Fast Return to LTE at CS call completionIntroduces the capability to redirect LTE capable UE at the end of a CSFB that was detected either as an RRC-based CSFB (at RRC CONNECTION without UE providing the Pre-redirection Info IE) or as a PS HO-based CSFB (at incoming 4G->3G RELOCATION REQUEST with Radio Network Layer Cause Extension IE = “CS Fallback triggered”).The PM170715 adds supplementary options on top of it. Required Feature. Strong interaction.

UA8 108661 LTE to UMTS PS HO and cell reselection enhancementsIntroduces the capability to detect an incoming PS HO-based CSFB call as a CS speech call that is setup in a TmaxDelayForCsCallEstablishment time period after an incoming 4G->3G RELOCATION REQUEST with Radio Network Layer Cause Extension IE = “CS Fallback triggered” has been successfully performed. Recommended Feature. No interaction but gain of 170715 is less when 108661 is enabled as most of the CSFB scenario will be PS HO-based and 170715 brings improvement for RRC-based CSFB only.

UA8 89858 iMCTA Enhanced - Redirection to LTE sub-featureIntroduces the capability to trigger a redirection to LTE on AO downsize from DCH to FACH or xPCH. Recommended Feature. No interaction but of interest if 134661 was not triggered due to non-detection of CSFB.

UA8 89857 iMCRA Step 2Introduces the capability to redirect to LTE an LTE capable UE at RRC CONNECTION with UE providing the Pre-redirection Info IE. Recommended Feature for LTE capable UE camping on 3G and connecting from Idle mode for PS service. Interaction with 170715 in the sense that in LR14.2W RNC does not trigger redirection to LTE if UE provides CSFB Indication IE in RRC CONNECTION REQUEST

PM170715 interactions with other features


Upgrade rules

At upgrade to LR14.2W, the new parameter will get the following value :

RadioAccessService::csfbDetectionMethod = CsfbDeduction


Activation Strategy in ORF Network3


FA Cluster

The NodeB cluster included 13 sites upgraded in LR14.2W and 6 sites that were still in LR13.3W but feature was activated on these 19 sites as it is managed at RNC level.

# RNC eNodeB Release

1ORLEANSV

1 CHATEAUROUX_OMELONLR14.2W

2ORLEANSV

1 CHATEAUROUX_MADRONLR14.2W

3ORLEANSV

1 CHATEAUROUX_ZI_ESTLR14.2W

4ORLEANSV

1CHATEAUROUX_CHRISTOPHE

LR14.2W

5ORLEANSV

1CHATEAUROUX_ETATS_UNIS

LR14.2W

6ORLEANSV

1 CHATEAUROUX_DEOLSLR14.2W

7ORLEANSV

1 MONTS_RIPAULTLR14.2W

8ORLEANSV

1 ISSOUDUN_HOPITALLR14.2W

9ORLEANSV

1CHATEAUROUX_PINGAUDIERE

LR14.2W

10ORLEANSV

1 ARGENTON_VERGERLR14.2W

11ORLEANSV

1 CHEDIGNYLR14.2W

12ORLEANSV

1 PERRUSSONLR14.2W

13ORLEANSV

1 ST_GAULTIERLR14.2W

14 ORLEANSV1 CHATEAUROUX_CENTRE LR13.3W

15 ORLEANSV1CHATEAUROUX_CITE_GD_CHAMPS

LR13.3W

16 ORLEANSV1CHATEAUROUX_CITE_ST_JEAN

LR13.3W

17 ORLEANSV1 CHATEAUROUX_FT LR13.3W18 ORLEANSV1 ISSOUDUN_BASQUE_SFR LR13.3W19 ORLEANSV1 ISSOUDUN_BEL_AIR LR13.3W


Feature activation

UA8 feature 134661 « Fast Return to LTE at CS call completion » was already activated at LR14.2W upgrade on the FA cluster.

Activation of 170715 « Fast Return to LTE improvement » was performed by changing the csfbDetectionMethod RNC parameter

Object Instance Parameter Old value New value

RNC ORLEANSV1 csfbDetectionMethod (class 3) CsfbDeductionCsfbDeductionAndIndication

isSib19Allowed true true

FDDCell Cluster cellsisReleaseAndRedirectionForCsFbAllowed

true true

sib19Enable true true

Object Instance Parameter Old value New value

FDDCell Cluster cells CellSelectionWithPriorityProfileId

CellProfiles/0 CellSelectionWithPriorityProfile/0

CellProfiles/0 CellSelectionWithPriorityProfile/0

EUtranFrequencyAndPriorityInfoList

CellSelectionWithPriorityProfiles/0 EUtranFrequencyAndPriorityInfoList/0

eUtraTargetDlCarrierFrequencyArfcn 3000 3000

eUtraTargetFrequencyMeasurementBandwidth 100 100

CellSelectionWithPriorityProfiles/0 EUtranFrequencyAndPriorityInfoList/0

eUtraTargetDlCarrierFrequencyArfcn 6400 6400

eUtraTargetFrequencyMeasurementBandwidth 50 50


Assessment – Fast Return Time4


Live tests were performed in order to compute the 3G->LTE Fast Return Time and compare it to the value commited with ORF.

Two kinds of tests were performed :• TC11:CSFB-Release-FR-To-LTE when csfbDetectionMethod = csfbDeductionAndIndication Start a CS call on 4G, UE will fallback to 3G, when releasing the CS the UE Fast Returns to LTE

• TC14:CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod=csfbDeductionAndIndication Start a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE

Two kinds of UE were used :−Samsung N4 : R9 supporting CSFB Indication IE

−Samsung S3 : R8 not supporting CSFB Indication IE

Fast Return time were measured from two different perspectives:User perspective, preferred by ORF, time between Disconnect message on 3G and

Tracking Area Update Complete on LTENetwork perspective, preferred by ALU, time between last RRC Connection Release

message on 3G and Tracking Are Update Request on LTE

Fast Return Time check (1/3)



Fast Return TimeORF

Fast Return TimeALU



Results FR Tests UE NodeB SW Redirection FR Time ORANGE (s)

Redirection FR Time ALU(s)

134661+170715 Activate

d

TC11 Samsung N4 LR14.2W 1,341 0,253

TC14 Samsung N4 LR14.2W 1,422 0,302

TC11 Samsung N4 LR13.3W 1,351 0,332

TC14 Samsung N4 LR13.3W 1,410 0,319

TC11 Samsung S3 LR14.2W 1,425 0,208

TC14 Samsung S3 LR14.2W 1,417 0,240

All tests were compliant with the commited ORF Fast Return Time of max 2s :


Assessment - Performance5


Fast Return performance (1/2)

• Improvement of Fast Return rate thanks to the decrease of the difference between number of CSFB detected and number of Fast Return trigerred, because LTE->3G redirections of R9+ UE for non-CSFB causes are not anymore detected as CSFB by RNC


Fast Return performance (2/2)

• Fast Rate improvement is correlated with difference between CSFB Detected and Fast Return


CSFB detected ratio Deduction vs Indication

• New screenings of CSFB Detected from “CSFB Indication” IE are pegged (R9 UE CSFB)


CS Voice RAB Setup Success Rate on CSFB

• New counters are pegged, CS Voice RAB Setup Success Rate is very good

• No CS Voice RAB setup for CSFB in Relocation as PS HO LTE->3G is not activated


CS Voice RAB Drop Rate on CSFB

• New counters are pegged, CS Voice RAB Drop Rate is very good

• No CS Voice RAB drop for CSFB in Relocation as PS HO LTE->3G is not activated


Accessibility – CS (1/2)

• First CS RRC Connection Success Rate globally stable with more variations after activation


Accessibility – CS (2/2)

• CS Call Setup Success Rate globally stable with more variations after activation


Accessibility – PS (1/2)

• First PS RRC Connection Success Rate globally stable with a temporary degradation on march 12-15 period


Accessibility – PS (2/2)

• PS Call Setup Success Rate globally stable with less variations after activation


Retainability – CS

• CS Call Drop globally stable with more variations after activation


Retainability – PS

• PS Call Drop globally stable


Traffic – PS DL

• DL PS Traffic globally stable the week after activation and increased after vacation (march 9)


Traffic – PS UL

• UL PS Traffic globally stable the week after activation and increased after vacation (march 9)


Quality – HSDPA Throughput

• HSDPA Throughput globally stable after activation with more stability and an increase after vacation time (march 10)


Quality – HSUPA Throughput

• HSUPA Throughput globally stable


Lessons learned from Call Trace7


CTg trace on RNC ORLEANSV1 on Thursday 12th March evening (8pm)

CS Speech calls traced for any UE type

Focus on the 1346 LTE capable UE speech calls

Analysis of these calls based on the combination of o “Pre-redirection Info” IE

o “CSFB Indication” IE

Goals were to assess : Distribution of R8/R9 LTE capable UE Percentage of R9 UE not supporting « CSFB Indication » IE Percentage of R9 UE calls where both IE are provided by UE Percentage of R8 UE supporting « CSFB Indication » IE

RNC call trace


From all LTE capable UE speech calls : 87% R9 - 13% R8Distribution of R8/R9 LTE capable UE

1346calls

1168R8

(86.78%)

Assumption for R8/R9 distribution of LTE->3G redirections

R8 UE(86.78%)

R9 UE(13.22%)

178R9

(13.22%)


2% of R9 UE not supporting « CSFB Indication » (2/92)• corresponding to 1.5% of CSFB detected (2/146)

Non-detection of the 2 CSFB above is mitigated by the new detection of some other CSFB scenario (see next page)

• also can be non-CSFB LTE->3G redirections followed by a CS speech call setup

Percentage of R9 UE not supporting « CSFB Indication » IE

1346calls

- 2

R9 UE178 calls109 IMSI

Pre-redirection Info

146 calls 92 IMSI

CSFB Indication144 calls 90 IMSI

CSFB Indication2 calls 2 IMSI

CSFB Detection based on« Pre-redirection Info » not present



4 calls observed with « Pre-redirection Info » and « CSFB Indication » IE provided by UE

• these 4 calls mitigate the 2 non-CSFB detections

This call scenario is probably due to engaged CSFB as per UE perspective but for which the LTE->3G redirection is not properly completed

• RRC CONNECTION RELEASE with « redirectedCarrierInfo » not received by UE

• UE getting out of coverage during engaged CSFB

R9 UE calls where both IE are provided by UE

1346calls

R9 UE178 calls

« Pre-redirection Info » not present


4CSFB Indication

28CSFB Indication

144CSFB Indication

2CSFB Indication

32Pre-redirection Info


- 2

+ 4


Lots of R8 UE do support R9 « CSFB Indication » IE : 75% of Detected CSFB • still 25% or R8 UE do not (243/990)

Network is not mature enough to activate 170715 feature for R8 UE as well

R8 UE supporting « CSFB Indication » IE

1346calls

R8 UE1168 calls

4CSFB Indication

174CSFB Indication

747CSFB Indication

243CSFB Indication



- 243

+ 4

« Pre-redirection Info » not present



Limitations8


In case of poor LTE coverage or LTE cells loaded, probability of a failure during the redirection to LTE may increase

o 3G->LTE RRC redirection being triggered in blind mode (not measurement based) o If no suitable cell on indicated LTE frequency(ies) is found within 10s, an attempt to camp on any suitable cell on any other available LTE frequencies is applicable.o If no LTE coverage is available, UE can spend up to 20s searching for LTE, before coming back to 3G.For such areas, reselection should be preferred, avoiding a potential 20s period when UE cannot be paged nor perform traffic.

A way to avoid this would be to deactivate the feature on 3G cells in areas with poor LTE coverage

« Redirection to LTE on AO Downsize » can also be disabled on those cells

Feature limitations – Poor LTE coverage


In case Fast Return to LTE feature (134661) is not activated on the whole RNS, some UE, the ones having performed a CSFB, will not be redirected to LTE if CS call completion takes place after a Primary Cell Change to a cell where FRtoLTE is not activated

This will degrade the Fast Return Success Rate

A way to avoid this would be to activate the feature on all 3G cells of same RNS for which we know that LTE coverage is good enough on the same serving area

As for LR13.3W, FRtoLTE is still not triggered after Iur mobilityo Inter-RNS Primary Cell Changeo SRNS relocation scenario

These two scenarios will be covered by LR15.3W feature 179215 Fast Return to LTE Enhancements

Feature limitations – Non global activation of Fast Return


Conclusion9


UE traces have shown that feature behaves as expectedNew counters were peggedFeature Pros & Cons :

+ no CSFB detection for non-CSFB LTE->3G redirection => no Fast Return if subsequent non-CSFB CS call ends on 3G

+ Fast Return if both « Pre-redirection Info » & « CSFB Indication » are provided by UE

- CSFB not detected and Fast Return not triggered if UE does not provide « CSFB Indication » :

• R8 UE : mitigated by choosing CsfbDeductionAndIndication instead of CsfbIndication• R9 UE : limited by the low quantity of such UE and availability of « Redirection to LTE on AO Downsize » feature

Conclusion


ANNEX – Tests


Test Activities•Lab Tests at CEVENNES from 5th to 19th February 2015

•Live Tests at CHATEAUROUX from 2nd to 14th March 2015

•Three mobiles have been usedo Two Pre-Rel9 UE

SAMSUNG S4 during Lab TestsSAMSUNG S3 during Live TestsThose UE are not supporting the optional « CSFB Indication » IE

o One Rel9 UESAMSUNG Note4 during Lab/Live TestsThis UE is supporting the « CSFB Indication » IE

•Note about the live tests number :o Tests 3, 7, 11, 14 and 16 have been executed 2 times

First time with LR14.2W NodeB sitesSecond time with LR13.3W NodeB sites


Test List (1/2)

Test Objective LAB LIVETest1 Verify that csfbDetectionMethod parameter can be set to different values via WO and online modification OK

Test2CSFB-Release-FR-To-LTE when csfbDetectionMethod = csfbDeduction -> Pre-Rel9 MSStart a CS call from 4g, UE will fallback to 3G, then when releasing CS call, UE Fast Returns to LTE OK

Test3CSFB-Release-FR-To-LTE when csfbDetectionMethod = csfbDeductionAndIndication -> Pre-Rel9 MSStart a CS call from 4g, UE will fallback to 3G, then when releasing CS call, UE Fast Returns to LTE OK OK

Test4 Verify that Pre-REL9 UE does not FR to LTE after CSFB when csfbDetectionMethod=csfbIndication OK

Test5verify that all non-cSFBIndication UE can not be identified as CSFB and will not fast return to LTE CSFB when csfbDetectionMethod=csfbIndication and a PS call is added on UMTS OK

Test6verify that all non-cSFBIndication UE can not be identified as CSFB and will not fast return to LTE CSFBwhen csfbDetectionMethod=csfbIndication and PS relocation is performed. OK

Test7

PS-then-CSFB-Release-FR-To-LTE when csfbDetectionMethod = csfbDeductionAndIndication -> Pre-Rel9 MSStart a PS call from 4G, add a CS call, UE will fallback to 3G, release CS call, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK OK

Test8

CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod = csfbDeduction -> Pre-Rel9 MSStart a CS call from 4G, UE will fallback to 3G, start a PS call, release CS call, UE Fast Returns to LTEwhile PS traffic is ongoing on LTE OK

Test9

CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod = csfbDeductionAndIndication -> Rel9 MSStart a CS call from 4G, UE will fallback to 3G, start a PS call, release CS call, UE Fast Returns to LTEwhile PS traffic is ongoing on LTE OK OK

Test9 bis

CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod = csfbDeductionAndIndication -> Pre-Rel9 MSStart a CS call from 4G, UE will fallback to 3G, start a PS call, release CS call, UE Fast Returns to LTEwhile PS traffic is ongoing on LTE OK

Test10 Verify that Post-REL9 UE always redirects to LTE after CSFB when csfbDetectionMethod=csfbDeduction OK

Test11CSFB-Release-FR-To-LTE when csfbDetectionMethod = csfbDeductionAndIndication -> Rel9 MSStart a CS call on 4G, UE will fallback to 3G, when releasing the CS the UE Fast Returns to LTE OK OK


Test Objective LAB LIVETest12 Verify that Post-REL9 UE always redirects to LTE after CSFB when csfbDetectionMethod=csfbIndication OK

Test13

CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod=csfbDeduction -> Rel9 MSStart a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK

Test14

CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod=csfbDeductionAndIndication -> Rel9 MSStart a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK OK

Test15

CSFB-PS-Release-FR-To-LTE when csfbDetectionMethod=csfbIndication -> Rel9 MSStart a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK

Test16

PS-CSFB-Release-FR-To-LTE when csfbDetectionMethod=csfbDeductionAndIndication -> Rel9 MSStart with a PS call on 4G, then make a CS call as well, UE will fallback to 3G, when releasing this CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK OK

Test17

PS-CSFB-Release-FR-To-LTE when csfbDetectionMethod=csfbIndication -> Rel9 MSStart with a PS call on 4G, then make a CS call as well, UE will fallback to 3G, when releasing this CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK

Test18

PS-CSFB-Release-FR-To-LTE when csfbDetectionMethod=csfbDeduction -> Rel9 MSStart with a PS call on 4G, then make a CS call as well, UE will fallback to 3G, when releasing this CS, UE Fast Returns to LTE while PS traffic is ongoing on LTE OK

Test19Verify that Post-REL9 UE does not FR to LTE when a PS call is redirected to 3G due to lost of radio contact with LTE cause and CS call is then made OK

Test20Verify that Pre-REL9 UE does not FR to LTE when a PS call is redirected to 3G due to lost of radio contact with LTE cause and CS call is then made OK

FR_Time_C1 Compute the Fast Return To LTE Time: Repeat 7 times the test TC11 and do the test TC14 12 times SAMSUNG Note4 OKFR_Time_C2 Compute the Fast Return To LTE Time: Repeat 7 times the test TC11 and do the test TC14 12 times SAMSUNG S3 OK

Test List (2/2)


•Live tests objectives were too Execute some functional test cases on the live contexto Compute the Fast Return Time

•The Fast Return Time Computation has been done with the following hypothesis:

Test11 & 14 were repeated several times, UE logs collected and information on 3G-4G transition time was extracted

•Fast Return time were measured from two different perspectives:User perspective, preferred by ORF, time between Disconnect message on 3G and

Tracking Area Update Complete on LTENetwork perspective, preferred by ALU, time between last RRC Connection Release

message on 3G and Tracking Are Update Request on LTELR14.2W NodeB tests have been done on Chateauroux Christophe siteLR13.3W NodeB tests have been done on Chateauroux FT siteSeveral roaming drives have been done in Chateauroux with both Samsung N4 and S3

Test on Live Network


•It has been observed on the FA area that some FRtoLTE were not triggered after CSFB in the following scenario : LTE to 3G CSFB was performed on a 3G site A CSFB was detected and counted as such on site A UE moved to another site when connected to 3G CS call was completed on a 3G site B where FRtoLTE was not triggered

•FRtoLTE was not triggered due to one of the following causes : 3G site B coverage was not overlapped by sufficient LTE coverage Fast Return feature was not activated on 3G site B

•Consequence was a bigger difference at NodeB cluster level between o the number of CSFB detectedo the number of Fast Return triggered

Local Field Configuration Impacts


Results FR Tests Time "Disconnect" Time"TAU Complete"Redirection FR Time

ORANGE (s)Time last "RRC

Connection Release"Time"TAU Request"


170715 Activate

d

TC11 - Try1 15:07:37:390 15:07:38:933 1.443 15:07:38:095 15:07:38:351 0.256

TC11- Try2 15:09:23:351 15:09:24:729 1.378 15:09:24:077 15:09:24:346 0.269

TC11- Try3 15:15:11:126 15:15:12:500 1.374 15:15:11:729 15:15:12:013 0.284

TC11- Try4 15:17:22:676 15:17:24:047 1.371 15:17:23:228 15:17:23:493 0.265

TC11- Try5 15:19:25:260 15:19:26:446 1.186 15:19:25:702 15:19:25:941 0.239

TC11- Try6 15:21:15:086 15:21:16:387 1.301 15:21:15:665 15:21:15:926 0.261

TC11- Try7 15:23:13:190 15:23:14:524 1.334 15:23:13:737 15:23:13:985 0.198

Moyenne TC11-7 1.341 0.253

Fast Return Time ComputationSAMSUNG Note4 on LR14.2W NodeB Sites (1/2)

• Fast Return time ORF commitment of maximum 2 seconds has been met for each particular test case.


Results FR TestsTime

"Disconnect" Time"TAU Complete"Redirection FR Time




170715 Activat

ed

TC14- Try1 15:34:00:076 15:34:01:832 1.756 15:34:00:921 15:34:01:148 0.227

TC14- Try2 15:34:29:261 15:34:30:510 1.249 15:34:29:868 15:34:30:100 0.232

TC14- Try3 15:35:33:961 15:35:35:711 1.75 15:35:34:599 15:35:35:269 0.67

TC14- Try4 15:37:28:125 15:37:29:390 1.265 15:37:28:696 15:37:28:975 0.279

TC14- Try5 15:38:22:327 15:38:23:774 1.447 15:38:22:913 15:38:23:292 0.379

TC14- Try6 15:38:57:903 15:38:59:294 1.391 15:38:58:424 15:38:58:750 0.326

TC14- Try7 15:39:32:045 15:39:34:114 2.069 15:39:33:444 15:39:33:730 0.286

TC14- Try8 15:40:15:007 15:40:16:151 1.144 15:40:15:491 15:40:15:723 0.232

TC14- Try9 15:40:46:342 15:40:47:688 1.346 15:40:46:970 15:40:47:244 0.274

TC14- Try10 15:41:30:649 15:41:31:783 1.134 15:41:31:139 15:41:31:350 0.211

TC14- Try11 15:42:23:426 15:42:24:592 1.166 15:42:23:996 15:42:24:227 0.231

TC14- Try12 15:43:47:443 15:43:48:794 1.351 15:43:47:993 15:43:48:264 0.271

Moyenne TC14-12 1.422 0.302

Fast Return Time ComputationSAMSUNG Note4 on LR14.2W NodeB Sites (2/2)







170715 Activat

ed

TC11 - Try1 12:57:09:291 12:57:10:503 1.212 12:57:09:858 12:57:10:091 0.243

TC11- Try2 13:00:24:352 13:00:25:688 1.436 13:00:24:886 13:00:25:238 0.352

TC11- Try3 13:03:29:806 13:03:31:087 1.281 13:03:30:302 13:03:30:561 0.259

TC11- Try6 13:11:49:983 13:11:51:445 1.462 13:11:50:533 13:11:51:017 0.484

TC11- Try7 13:14:32:405 13:14:33:769 1.364 13:14:32:995 13:14:33:315 0.32

Moyenne TC11-5 1.351 0.332

TC14- Try1 13:18:37:336 13:18:38:593 1.157 13:18:37:935 13:18:38:168 0.235

TC14- Try8 13:26:45:856 13:26:47:589 1.733 13:26:46:358 13:26:46:833 0.475

TC14- Try9 13:27:10:283 13:27:11:696 1.413 13:27:10:966 13:27:11:286 0.32

TC14- Try10 13:27:42:534 13:27:43:871 1.337 13:27:43:219 13:27:43:465 0.246

Moyenne TC14-4 1.41 0.319

Fast Return Time ComputationSAMSUNG Note4 on LR13.3W NodeB Sites


Results FR Tests Time "Disconnect" Time"TAU Complete"Redirection FR Time




170715 Activate

d

TC11 - Try1 11:12:37:633 11:12:39:045 1.412 11:12:38:394 11:12:38:647 0.253

TC11- Try2 11:19:14:977 11:19:16:089 1.112 11:19:15:674 11:19:15:780 0.106

TC11- Try3 11:21:51:712 11:21:53:320 1.608 11:21:52:498 11:21:52:692 0.194

TC11- Try4 11:25:00:761 11:25:02:291 1.53 11:25:01:671 11:25:01:838 0.167

TC11- Try5 11:27:55:954 11:27:57:256 1.302 11:27:56:643 11:27:56:857 0.214

TC11- Try6 11:31:26:034 11:31:27:472 1.438 11:31:26:874 11:31:27:048 0.274

TC11- Try7 11:34:24:288 11:34:25:862 1.574 11:34:25:226 11:34:25:474 0.248

Moyenne TC11-7 1.425 0.208

Fast Return Time ComputationSAMSUNG S3 on LR14.2W NodeB Sites (1/2)







170715 Activat

ed

TC14- Try1 11:42:07:336 11:42:08:786 1.45 11:42:08:051 11:42:08:339 0.288

TC14- Try2 11:42:42:247 11:42:43:578 1.331 11:42:43:034 11:42:43:251 0.217

TC14- Try4 12:13:14:348 12:13:15:833 1.485 12:13:15:120 12:13:15:283 0.163

TC14- Try5 12:13:26:881 12:13:28:789 1.908 12:13:28:334 12:13:28:420 0.086

TC14- Try6 12:13:52:177 12:13:53:539 1.362 12:13:52:870 12:13:53:117 0.86

TC14- Try7 12:14:20:498 12:14:21:923 1.425 12:14:21:306 12:14:21:531 0.225

TC14- Try8 12:14:45:525 12:14:46:918 1.393 12:14:46:263 12:14:46:428 0.165

TC14- Try9 12:15:10:973 12:15:12:365 1.392 12:15:11:695 12:15:11:958 0.263

TC14- Try10 12:15:36:052 12:15:37:434 1.382 12:15:36:980 12:15:37:034 0.054

TC14- Try11 12:15:59:829 12:16:01:132 1.303 12:16:00:550 12:16:00:716 0.166

TC14- Try12 12:16:38:296 12:16:39:452 1.156 12:16:38:884 12:16:39:041 0.157

Moyenne TC14-12 1.417 0.24

Fast Return Time ComputationSAMSUNG S3 on LR14.2W NodeB Sites (2/2)


TC14 Call Flow – QXDM trace in Lab (1/12)Using R9 UE SAMSUNG N4 supporting “CSFB Indication” IE

UE starts CSFB



eNodeB redirects UE to 3G carrier 10786



UE connects to 3G cell and provides « CSFB Indication » IE in RRC CONNECTION REQUEST



UE sending CM Service Request for CS speech call setup



End-to-end voice path is setup



PDP Ctx activation requestfor PS call to be setup



PDP Ctx activated



UE releases the speech call



UTRAN Fast Returns the UE to LTEthrough an RRC Redirection procedure



UE registers at connection to LTE



UE connects to LTE for Originating Call setup



Resumption of suspended EPS bearers


ANNEX – AR1-5624148 analysis

kts lr14.2w 170715 fast return to lte improvement sep...

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