This document discusses testing of CSFB (Circuit Switched Fallback) from LTE with and without DMCR (Deferred Measurement Control Reading). DMCR aims to decrease CSFB call setup time by allowing the UE to take certain actions before fully reading system information. The tests show that with DMCR enabled, CSFB call setup time is reduced by around 1 second compared to without DMCR. Parameters are configured on the RNC to enable CSFB and DMCR, and different test cases measure CSFB time in idle and active LTE states with and without DMCR.

1. Abhijeet Kumar NAK 2014 - PRESENTATION TITLE - DEPARTMENT AUTHOR - 2014-04-26
CSFB FROM LTE WITH DMCR &
Without DMCR

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CSFB subscribers roam with preference on LTE access, no CS-voice service available (only
PS based services)
Fallback triggered to overlapping CS domain whenever voice services are requested and
resumed LTE access for PS services after call completion.
CSFB is enhanced with support for DMCR to decrease the call set up time. If
the DMCR capability is on and the DMCR is activated in SIB3 then the UE is allowed to send
message on RACH or act on received message on FACH before complete reading of
SIB11/SIB12/SIB19.
The feature Deferred Measurement Control Reading provides faster call setup time
for CS Fallback from LTE with release with redirect.
1. Introduction
1. Purpose
This instruction is used for the CSFB From LTE with DMCR (FAJ 121 1610 ) activation
procedure by MOS Script on software level W12B in RNC side.

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The following Feature/parameter
Node Mo Parameter Required
RNC RncFeature CsFallbackLte 1
RNC UtranCell dmcrEnabled 1
DMCR Feature

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Node Mo Parameter New
RNC Rnc Feature LteCellReselection.featureState 1 (Activate)
RNC Sid schedulingBlockEnabled 1
RNC Sid sib19.sib19RepPeriod 256
RNC UtranCell AbsPrioCellRes.cellReselectionPriority 2
RNC Sid SIB11 12
RNC Sid sib5RepPeriod 32
RNC RncFunction loadSharingRrcEnabled TRUE
RNC UtranRelation loadSharingCandidate define
RNC UtranRelation loadSharingThreshold 0
RNC UtranCell interFreqFddMeasIndicator 0
Parameter at RNC

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DESCRIPTION
CS fallback triggered UE release to WCDMA - Idle Mode.
1.PRECONDITION
•Enable licence key file CsFallbackLte (CXC 403 0106) in the RNC
•The timer on the eNodeB to control user inactivity is “tInactivity Timer” which is set to 10 sec. UE performs the
normal attach and goes into idle state due to user inactivity.
set rcs tinactivitytimer 10
•The deactivation of DMCR feature done at the Utrancell level.
set Utrancell=x dmcrenabled 0
1.CSFB triggered UE release to WDCMA while user is Idle Mode due to inactivity - Mobile
originating without DMCR.
1.TEST INSTRUCTION
Action: Attach relevant WCDMA UE and LTE UE.
Action: Make LTE UE IDLE Mode
Action: Make call from WCDMA UE to LTE UE

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CSFB Procedure
6

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CSFB Delay
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CSFB call setup time standards
MT：Extend service request To Alerting.
Delay 2.2 s from extended service request to CC Alerting
Delay 3.6 s from CC alerting to CC connect.
Total CSFB time is 5.8 s

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1.DESCRIPTION
1.Verify the gain of 1 second in CS call setup using CSFB with DMCR in WCDMA/LTE test environment.
2.PRECONDITION
.
• Enable licence key file CsFallbackLte (CXC 403 0106) in the RNC
• The timer on the eNodeB to control user inactivity is “tInactivity Timer” which is set to 10 sec. UE performs the normal attach and goes into idle
state due to user inactivity
• The activation of DMCR feature done at the Utrancell level.
set Utrancell=x dmcrenabled 1
We should see SIB3 message to notify about feature activation
CSFB triggered UE release to WDCMA while user is Idle Mode due to inactivity - Mobile
originating with DMCR
1.TEST INSTRUCTION
Action: Attach relevant WCDMA UE and LTE UE.
Action: Make LTE UE IDLE mode
Action: Make call from WCDMA UE to LTE UE

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CSFB Delay
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CSFB call setup time standards
MT：Extend service request To Alerting.
Delay 2.6 s from extended service request to CC Alerting
Delay 3.9 s from CC alerting to CC connect.
Total CSFB time is 6.5 s

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DESCRIPTION
While PS call on LTE UE, CS fallback triggered UE release to WCDMA.
PRECONDITION
•Enable licence key file CsFallbackLte (CXC 403 0106) in the RNC
•The deactivation of DMCR feature done at the Utrancell level.
set Utrancell=x dmcrenabled 0
TC-3 CSFB triggered UE release to WDCMA while PS call is happening - Mobile originating without DMCR.
Action: Attach relevant WCDMA UE and LTE UE.
Action: Make PS call on LTE UE
Action: Make call from WCDMA UE to LTE UE

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CSFB Procedure
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1.MT CSFB call attempt with extend service request.
The UTRAN frequency is included in RRC Connection Release message.

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CSFB Procedure
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2. Routing Area Update

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3. Authentication, call proceeding and radio bearer setup.

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. Call alerting and setup success

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2nd call from WCDMA UE to LTE UE in PS mode
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CSFB Time : 6.4 S

21. Abhijeet Kumar NAK 2014 - PRESENTATION TITLE - DEPARTMENT AUTHOR - 2014-04-26
CSFB Delay
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CSFB call setup time standards
MT：Extend service request To Alerting.
Delay 2.6 s from extended service request to CC Alerting
Delay 3.8 s from CC alerting to CC connect.
Total CSFB time is 6.4 s

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1.Verify the gain of 1 second in CS call setup using CSFB with DMCR in WCDMA/LTE test
environment.
2.PRECONDITION
•Ensure that the preconditions as tested in 3.1 are followed for the appropriate frequency
eNodeB/eUtranCell being tested.
•Enable licence key file CsFallbackLte (CXC 403 0106) in the RNC
•The activation of DMCR feature done at the Utrancell level.
set Utrancell=x dmcrenabled 1
1.CSFB triggered UE release to WDCMA while PS call is happening - Mobile originating with DMCR.
Action: Attach relevant WCDMA UE and LTE UE.
Action: Make PS call on LTE UE
Action: Make call from WCDMA UE to LTE UE

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CSFB Delay
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CSFB call setup time standards
MT：Extend service request To Alerting.
Delay 2.47 s from extended service request to CC Alerting
Delay 3.23 s from CC alerting to CC connect.
Total CSFB time is 5.7 s

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Result
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IDLE: DMCE Disabled total CSFB time 5.8 s
IDLE : DMCR enabled Total CSFB time 6.5 s
PS: DMCR disabled Total CSFB time 6.4
PS: DMCR enabled Total CSFB time 5.7 s

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THANKS