KTS LR14.2W Fast Return to LTE improvement Sep 8th 2015 NEA/TIS Jean-Noël CHARNEAU/Boubacar COULIBALY/Sophie PIEKAREC

Transcription

1 KTS LR14.2W Fast Return to LTE improvement Sep 8th 2015 NEA/TIS Jean-Noël CHARNEAU/Boubacar COULIBALY/Sophie PIEKAREC 1

2 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 - AR analysis 2

3 1 Feature Description 3

4 Feature Objectives 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 4

5 is based on UA Purpose of UA8.1 PM 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 3GPP 9.4+ : UE shall not include «Pre-redirection Info» in RRC CONNECTION REQUEST if redirected by LTE CSFB detection is based on the absence of «Pre-Redirection info» IE at RRC connection If UE is LTE capable: CsfbDetection is set to TRUE VS.CsfbDetectionInRrcConn++ Detection of fake CSFB If UE redirected by LTE for radio or load reason Side effect: UE Fast Returned to LTE if CS call is setup 5

6 added value CSFB is detected by RNC if optional «CSFB Indication» IE is present in RRC CONNECTION REQUEST 3GPP 9.11+: UE should include «CSFB Indication» in RRC CONNECTION REQUEST if redirected by LTE for CSFB UE CSFB detection is based on the presence of «CSFB Indication» IE at RRC connection If UE is LTE capable: Risk of non detection of true CSFB if UE not supporting «CSFB Indication» CsfbDetection is set to TRUE Side effect: UE not Fast Returned to LTE at CS call release VS.CsfbDetectionInRrcConn++ 6

7 Impact on CSFB Detection at RNC LTE -> 3G redirections CSFB Non-CSFB (radio, offload) LTE 3G No Pre-redirection Pre-redirection Info CSFB Indication CSFB Indication (C) No CSFB Indication (B) No CSFB Indication No Pre-redirection Info Pre-redirection Info CS Speech call (A) No CS Speech call CSFB Detection based on «Pre-redirection Info» not present «CSFB Indication» present Call is not a CS fallback, and feature mistakenly fast returns the UE UE does not support CSFB Indication, and does not fast return the UE UE provides both Pre-redirection Info & CSFB Indication, and fast returns the UE where does not 7

8 Feature Pros & Cons Gain UE Types [1] Pre CSFB Redirectio (csfbdetectionm Indication n Info ethod= presence present CsfbDeduction) 1 Yes (csfbdetectionm Comments ethod= CsfbIndication) No Redirect Redirect Common CSFB scenario of R9 UE. Most of R8 UE performs also this CSFB scenario. Yes No Redirect Redirect Few cases observed for both R8 and R9 UE CSFB. 3 supports CSFB indication 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. Yes No Redirect No Redirect Not a CSFB scenario. Speech call setup scenario for UE camping on 3G. No Pros does not support CSFB indication No Redirect No Redirect Yes No Redirect No Redirect No 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. Not a normal CSFB scenario. Speech call setup scenario for UE camping on 3G. Can correspond to a CSFB performed in poor radiio conditions. Cons Gain is expected if feature is activated for R9 UE only (csfbdeductionandindication). [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. 8

9 Two steps activation of the feature 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) New parameter 1st step 2nd step CSFB Detection at RNC R8 UE R9+ UE "Pre-redirection "Pre-redirection csfbdeduction Info" not present Info" not present csfbdeductionandind "Pre-redirection "CSFB Indication" ication Info" not present present "CSFB Indication" "CSFB Indication" csfbindication present present csfbdetectionmethod 9

10 2 Interactions with other features and Upgrade rules 10

11 PM interactions with other features UA Fast Return to LTE at CS call completion Introduces the capability to redirect LTE capable UE at the end of a CSFB that was detected either as an RRCbased 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 PM adds supplementary options on top of it. Required Feature. Strong interaction. UA LTE to UMTS PS HO and cell reselection enhancements Introduces 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 is less when is enabled as most of the CSFB scenario will be PS HO-based and brings improvement for RRC-based CSFB only. UA imcta Enhanced - Redirection to LTE sub-feature Introduces 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 was not triggered due to non-detection of CSFB. UA imcra Step 2 Introduces the capability to redirect to LTE an LTE capable UE at RRC CONNECTION with UE providing the Preredirection Info IE. Recommended Feature for LTE capable UE camping on 3G and connecting from Idle mode for PS service. Interaction with in the sense that in LR14.2W RNC does not trigger redirection to LTE if UE provides 11 CSFB Indication IE in RRC CONNECTION REQUEST

12 At upgrade to LR14.2W, the new parameter will get the following value : RadioAccessService::csfbDetectionMethod = CsfbDeduction 12

13 3 Activation Strategy in ORF Network 13

14 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 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 ORLEANSV 1 enodeb CHATEAUROUX_OMELON CHATEAUROUX_MADRON Release LR14.2W LR14.2W LR14.2W CHATEAUROUX_ZI_EST CHATEAUROUX_CHRISTOP LR14.2W HE CHATEAUROUX_ETATS_UNI LR14.2W S CHATEAUROUX_DEOLS MONTS_RIPAULT LR14.2W LR14.2W ORLEANSV1 CHATEAUROUX_CENTRE CHATEAUROUX_CITE_GD_CH ORLEANSV1 AMPS CHATEAUROUX_CITE_ST_JEA ORLEANSV1 N ORLEANSV1 CHATEAUROUX_FT ORLEANSV1 ISSOUDUN_BASQUE_SFR ORLEANSV1 ISSOUDUN_BEL_AIR LR14.2W ISSOUDUN_HOPITAL CHATEAUROUX_PINGAUDIE LR14.2W 14 RE LR13.3W LR13.3W LR13.3W LR13.3W LR13.3W LR13.3W

15 UA8 feature «Fast Return to LTE at CS call completion» was already activated at LR14.2W upgrade on the FA cluster. Activation of «Fast Return to LTE improvement» was performed by changing the csfbdetectionmethod RNC parameter Object RNC FDDCell Instance ORLEANSV1 Cluster cells Parameter Old value New value csfbdetectionmethod (class 3) CsfbDeduction CsfbDeductionAndIndi cation issib19allowed true isreleaseandredirectionforcsfballowe true d sib19enable true Object Instance Parameter FDDCell Cluster cells CellSelectionWithPriorityProfileId true true true CellSelectionWithPriorityProfiles/ eutratargetdlcarrierfrequencyarfcn 0 eutratargetfrequencymeasurementba EUtranFrequencyAndPriorityInfoL ndwidth EUtranFrequencyAndPriorityI ist/0 nfolist CellSelectionWithPriorityProfiles/ eutratargetdlcarrierfrequencyarfcn 15 0 eutratargetfrequencymeasurementba Old value CellProfiles/0 CellSelection WithPriorityPr ofile/ New value CellProfiles/0 CellSelection WithPriorityPr ofile/

16 4 Assessment Fast Return Time 16

17 Fast Return Time check (1/3) 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 LTE Network perspective, preferred by ALU, time between last RRC Connection Release message on 3G and Tracking Are Update Request on LTE 17

18 Fast Return Time check (2/3) Fast Return Time ALU Fast Return Time ORF 18

19 Fast Return Time check (3/3) All tests were compliant with the commited ORF Fast Return Time of max 2s : Results Activate d FR Tests UE NodeB SW Redirection FR Time ORANGE (s) Redirection FR Time ALU(s) 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 19

20 5 Assessment - Performance 20

21 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 21

22 Fast Rate improvement is correlated with difference between CSFB Detected and Fast Return 22

23 New screenings of CSFB Detected from CSFB Indication IE are pegged (R9 UE CSFB) 23

24 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 24

25 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 25

26 First CS RRC Connection Success Rate globally stable with more variations after activation 26

27 CS Call Setup Success Rate globally stable with more variations after activation 27

28 First PS RRC Connection Success Rate globally stable with a temporary degradation on march period 28

29 PS Call Setup Success Rate globally stable with less variations after activation 29

30 CS Call Drop globally stable with more variations after activation 30

31 PS Call Drop globally stable 31

32 DL PS Traffic globally stable the week after activation and increased after vacation (march 9) 32

33 UL PS Traffic globally stable the week after activation and increased after vacation (march 9) 33

34 HSDPA Throughput globally stable after activation with more stability and an increase after vacation time (march 10) 34

35 HSUPA Throughput globally stable 35

36 7 Lessons learned from Call Trace 36

37 RNC call trace 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 37

38 Distribution of R8/R9 LTE capable UE From all LTE capable UE speech calls : 87% R9-13% R R8 (86.78%) R8 UE (86.78%) 178 R9 (13.22%) R9 UE (13.22%) 1346 calls Assumption for R8/R9 distribution of LTE->3G redirections 38

39 Percentage of R9 UE not supporting «CSFB Indication» IE 2% of R9 UE not supporting «CSFB Indication» (2/92) corresponding to 1.5% of CSFB detected (2/146) 1346 calls R9 UE 178 calls 109 IMSI CSFB Detection based on Pre-redirection Info 146 calls 92 IMSI «Pre-redirection Info» not present CSFB Indication 144 calls 90 IMSI CSFB Indication 2 calls 2 IMSI -2 «CSFB Indication» present Non-detection of the 2 CSFB above is mitigated by the new detection of some other CSFB scenario (see next page) 39

40 R9 UE calls where both IE are provided by UE 4 calls observed with «Pre-redirection Info» and «CSFB Indication» IE provided by UE these 4 calls mitigate the 2 non-csfb detections 32 Pre-redirection Info 1346 calls «Pre-redirection Info» not present R9 UE 178 calls 146 Pre-redirection Info «CSFB Indication» present 4 CSFB Indication 28 CSFB Indication CSFB Indication 2 CSFB Indication -2 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 40

41 R8 UE supporting «CSFB Indication» IE Lots of R8 UE do support R9 «CSFB Indication» IE : 75% of Detected CSFB still 25% or R8 UE do not (243/990) 178 Pre-redirection Info 1346 calls «Pre-redirection Info» not present R8 UE 1168 calls 990 Pre-redirection Info «CSFB Indication» present 4 CSFB Indication CSFB Indication 747 CSFB Indication 243 CSFB Indication Network is not mature enough to activate feature for R8 UE as well 41

42 8 Limitations 42

43 Feature limitations Poor LTE coverage 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 43

44 Feature limitations Non global activation of Fast Return 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 mobility o Inter-RNS Primary Cell Change o SRNS relocation scenario These two scenarios will be covered by LR15.3W feature Fast Return to LTE Enhancements 44

45 9 Conclusion 45

46 Conclusion UE traces have shown that feature behaves as expected New counters were pegged Feature 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 46

47 ANNEX Tests 47

48 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 used o Two Pre-Rel9 UE SAMSUNG S4 during Lab Tests SAMSUNG S3 during Live Tests Those UE are not supporting the optional «CSFB Indication» IE o One Rel9 UE SAMSUNG Note4 during Lab/Live Tests This 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 sites Second time with LR13.3W NodeB sites 48

49 Test List (1/2) Test Objective Verify that csfbdetectionmethod parameter can be set to different values via WO and online modification CSFB-Release-FR-To-LTE when csfbdetectionmethod = csfbdeduction -> Pre-Rel9 MS Test2 Start a CS call from 4g, UE will fallback to 3G, then when releasing CS call, UE Fast Returns to LTE CSFB-Release-FR-To-LTE when csfbdetectionmethod = csfbdeductionandindication -> Pre-Rel9 MS Test3 Start a CS call from 4g, UE will fallback to 3G, then when releasing CS call, UE Fast Returns to LTE Test4 Verify that Pre-REL9 UE does not FR to LTE after CSFB when csfbdetectionmethod=csfbindication verify that all non-csfbindication UE can not be identified as CSFB and will not fast return to LTE CSFB Test5 when csfbdetectionmethod=csfbindication and a PS call is added on UMTS verify that all non-csfbindication UE can not be identified as CSFB and will not fast return to LTE CSFB Test6 when csfbdetectionmethod=csfbindication and PS relocation is performed. PS-then-CSFB-Release-FR-To-LTE when csfbdetectionmethod = csfbdeductionandindication -> Pre-Rel9 MS Start 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 Test7 ongoing on LTE CSFB-PS-Release-FR-To-LTE when csfbdetectionmethod = csfbdeduction -> Pre-Rel9 MS Start a CS call from 4G, UE will fallback to 3G, start a PS call, release CS call, UE Fast Returns to LTE Test8 while PS traffic is ongoing on LTE CSFB-PS-Release-FR-To-LTE when csfbdetectionmethod = csfbdeductionandindication -> Rel9 MS Start a CS call from 4G, UE will fallback to 3G, start a PS call, release CS call, UE Fast Returns to LTE Test9 while PS traffic is ongoing on LTE CSFB-PS-Release-FR-To-LTE when csfbdetectionmethod = csfbdeductionandindication -> Pre-Rel9 MS Start a CS call from 4G, UE will fallback to 3G, start a PS call, release CS call, UE Fast Returns to LTE Test9 bis while PS traffic is ongoing on LTE Test10 Verify that Post-REL9 UE always redirects to LTE after CSFB when csfbdetectionmethod=csfbdeduction CSFB-Release-FR-To-LTE when csfbdetectionmethod = csfbdeductionandindication -> Rel9 MS Test11 Start a CS call on 4G, UE will fallback to 3G, when releasing the CS the UE Fast Returns to LTE Test1 49 LAB OK LIVE OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK

50 Test List (2/2) Test Objective Verify that Post-REL9 UE always redirects to LTE after CSFB when csfbdetectionmethod=csfbindication CSFB-PS-Release-FR-To-LTE when csfbdetectionmethod=csfbdeduction -> Rel9 MS Start a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE Test13 while PS traffic is ongoing on LTE CSFB-PS-Release-FR-To-LTE when csfbdetectionmethod=csfbdeductionandindication -> Rel9 MS Start a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE Test14 while PS traffic is ongoing on LTE CSFB-PS-Release-FR-To-LTE when csfbdetectionmethod=csfbindication -> Rel9 MS Start a CS call on 4G, UE will fallback to 3G, add a PS call on 3G, release CS, UE Fast Returns to LTE Test15 while PS traffic is ongoing on LTE PS-CSFB-Release-FR-To-LTE when csfbdetectionmethod=csfbdeductionandindication -> Rel9 MS Start with a PS call on 4G, then make a CS call as well, UE will fallback to 3G, when releasing this CS, UE Fast Test16 Returns to LTE while PS traffic is ongoing on LTE PS-CSFB-Release-FR-To-LTE when csfbdetectionmethod=csfbindication -> Rel9 MS Start with a PS call on 4G, then make a CS call as well, UE will fallback to 3G, when releasing this CS, UE Fast Test17 Returns to LTE while PS traffic is ongoing on LTE PS-CSFB-Release-FR-To-LTE when csfbdetectionmethod=csfbdeduction -> Rel9 MS Start with a PS call on 4G, then make a CS call as well, UE will fallback to 3G, when releasing this CS, UE Fast Test18 Returns to LTE while PS traffic is ongoing on LTE Verify that Post-REL9 UE does not FR to LTE when a PS call is redirected to 3G due to lost of Test19 radio contact with LTE cause and CS call is then made Verify that Pre-REL9 UE does not FR to LTE when a PS call is redirected to 3G due to lost of Test20 radio contact with LTE cause and CS call is then made 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 FR_Time_C2 Compute the Fast Return To LTE Time: Repeat 7 times the test TC11 and do the test TC14 12 times SAMSUNG S3 Test12 50 LAB OK LIVE OK OK OK OK OK OK OK OK OK OK OK OK

51 Test on Live Network Live tests objectives were to o Execute some functional test cases on the live context o 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 LTE Network perspective, preferred by ALU, time between last RRC Connection Release message on 3G and Tracking Are Update Request on LTE LR14.2W NodeB tests have been done on Chateauroux Christophe site LR13.3W NodeB tests have been done on Chateauroux FT site Several roaming drives have been done in Chateauroux with both Samsung N4 and S3 51

52 Local Field Configuration Impacts 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 detected o the number of Fast Return triggered 52

53 Fast Return Time Computation SAMSUNG 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 Activate d FR Tests Time "Disconnect" Time"TAU Complete" Redirection FR Time Time last "RRC Redirection FR Time Time"TAU Request" ORANGE (s) Connection Release" ALU(s) TC11 - Try1 15:07:37:390 15:07:38: :07:38:095 15:07:38: TC11- Try2 15:09:23:351 15:09:24: :09:24:077 15:09:24: TC11- Try3 15:15:11:126 15:15:12: :15:11:729 15:15:12: TC11- Try4 15:17:22:676 15:17:24: :17:23:228 15:17:23: TC11- Try5 15:19:25:260 15:19:26: :19:25:702 15:19:25: TC11- Try6 15:21:15:086 15:21:16: :21:15:665 15:21:15: TC11- Try7 15:23:13:190 15:23:14: :23:13:737 15:23:13: Moyenne TC

54 Fast Return Time Computation SAMSUNG Note4 on LR14.2W NodeB Sites (2/2) Results Activat ed FR Tests Time "Disconnect" Time"TAU Complete" Time"TAU Request" Redirection FR Time ALU(s) TC14- Try1 15:34:00:076 15:34:01: :34:00:921 15:34:01: TC14- Try2 15:34:29:261 15:34:30: :34:29:868 15:34:30: TC14- Try3 15:35:33:961 15:35:35: :35:34:599 15:35:35: TC14- Try4 15:37:28:125 15:37:29: :37:28:696 15:37:28: TC14- Try5 15:38:22:327 15:38:23: :38:22:913 15:38:23: TC14- Try6 15:38:57:903 15:38:59: :38:58:424 15:38:58: TC14- Try7 15:39:32:045 15:39:34: :39:33:444 15:39:33: TC14- Try8 15:40:15:007 15:40:16: :40:15:491 15:40:15: TC14- Try9 15:40:46:342 15:40:47: :40:46:970 15:40:47: TC14- Try10 15:41:30:649 15:41:31: :41:31:139 15:41:31: TC14- Try11 15:42:23:426 15:42:24: :42:23:996 15:42:24: TC14- Try12 15:43:47:443 15:43:48: :43:47:993 15:43:48: Moyenne TC14-12 Redirection FR Time Time last "RRC ORANGE (s) Connection Release"

55 Fast Return Time Computation SAMSUNG Note4 on LR13.3W NodeB Sites Results Activat ed FR Tests Time "Disconnect" Time"TAU Complete" Time"TAU Request" Redirection FR Time ALU(s) TC11 - Try1 12:57:09:291 12:57:10: :57:09:858 12:57:10: TC11- Try2 13:00:24:352 13:00:25: :00:24:886 13:00:25: TC11- Try3 13:03:29:806 13:03:31: :03:30:302 13:03:30: TC11- Try6 13:11:49:983 13:11:51: :11:50:533 13:11:51: TC11- Try7 13:14:32:405 13:14:33: :14:32:995 13:14:33: Moyenne TC11-5 Redirection FR Time Time last "RRC ORANGE (s) Connection Release" TC14- Try1 13:18:37:336 13:18:38: :18:37:935 13:18:38: TC14- Try8 13:26:45:856 13:26:47: :26:46:358 13:26:46: TC14- Try9 13:27:10:283 13:27:11: :27:10:966 13:27:11: TC14- Try10 13:27:42:534 13:27:43: :27:43:219 13:27:43: Moyenne TC

56 Fast Return Time Computation SAMSUNG S3 on LR14.2W NodeB Sites (1/2) Results Activate d FR Tests Time "Disconnect" Time"TAU Complete" Redirection FR Time Time last "RRC Redirection FR Time Time"TAU Request" ORANGE (s) Connection Release" ALU(s) TC11 - Try1 11:12:37:633 11:12:39: :12:38:394 11:12:38: TC11- Try2 11:19:14:977 11:19:16: :19:15:674 11:19:15: TC11- Try3 11:21:51:712 11:21:53: :21:52:498 11:21:52: TC11- Try4 11:25:00:761 11:25:02: :25:01:671 11:25:01: TC11- Try5 11:27:55:954 11:27:57: :27:56:643 11:27:56: TC11- Try6 11:31:26:034 11:31:27: :31:26:874 11:31:27: TC11- Try7 11:34:24:288 11:34:25: :34:25:226 11:34:25: Moyenne TC

57 Fast Return Time Computation SAMSUNG S3 on LR14.2W NodeB Sites (2/2) Results Activat ed FR Tests Time "Disconnect" Time"TAU Complete" Time"TAU Request" Redirection FR Time ALU(s) TC14- Try1 11:42:07:336 11:42:08: :42:08:051 11:42:08: TC14- Try2 11:42:42:247 11:42:43: :42:43:034 11:42:43: TC14- Try4 12:13:14:348 12:13:15: :13:15:120 12:13:15: TC14- Try5 12:13:26:881 12:13:28: :13:28:334 12:13:28: TC14- Try6 12:13:52:177 12:13:53: :13:52:870 12:13:53: TC14- Try7 12:14:20:498 12:14:21: :14:21:306 12:14:21: TC14- Try8 12:14:45:525 12:14:46: :14:46:263 12:14:46: TC14- Try9 12:15:10:973 12:15:12: :15:11:695 12:15:11: TC14- Try10 12:15:36:052 12:15:37: :15:36:980 12:15:37: TC14- Try11 12:15:59:829 12:16:01: :16:00:550 12:16:00: TC14- Try12 12:16:38:296 12:16:39: :16:38:884 12:16:39: Moyenne TC14-12 Redirection FR Time Time last "RRC ORANGE (s) Connection Release"

58 TC14 Call Flow QXDM trace in Lab (1/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UE starts CSFB 58

59 TC14 Call Flow QXDM trace in Lab (2/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE enodeb redirects UE to 3G carrier

60 TC14 Call Flow QXDM trace in Lab (3/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UE connects to 3G cell and provides «CSFB Indication» IE in RRC CONNECTION REQUEST 60

61 TC14 Call Flow QXDM trace in Lab (4/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UE sending CM Service Request for CS speech call setup 61

62 TC14 Call Flow QXDM trace in Lab (5/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE End-to-end voice path is setup 62

63 TC14 Call Flow QXDM trace in Lab (6/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE PDP Ctx activation request for PS call to be setup 63

64 TC14 Call Flow QXDM trace in Lab (7/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE PDP Ctx activated 64

65 TC14 Call Flow QXDM trace in Lab (8/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UE releases the speech call 65

66 TC14 Call Flow QXDM trace in Lab (9/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UTRAN Fast Returns the UE to LTE through an RRC Redirection procedure 66

67 TC14 Call Flow QXDM trace in Lab (10/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UE registers at connection to LTE 67

68 TC14 Call Flow QXDM trace in Lab (11/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE UE connects to LTE for Originating Call setup 68

69 TC14 Call Flow QXDM trace in Lab (12/12) Using R9 UE SAMSUNG N4 supporting CSFB Indication IE Resumption of suspended EPS bearers 69

70 ANNEX AR analysis 70

71 71