CSFB & IRAT Drive Test Methodology

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T01 IRAT Mobility Test... T01-01 CS Fallback to UTRAN...

CSFB & IRAT

Drive test Case

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1. LTE to UMTS CSFB by using measurement-based PS handover for an idle UE making a mobile-originated call... 2. LTE to UMTS CSFB by using measurement-based PS handover for an idle UE

making a mobile-terminated call... 3. LTE to UMTS CSFB by using measurement-based PS handover for a connected

UE making a mobile-originated call... 4. LTE to UMTS CSFB by using measurement-based PS handover for a connected

UE making a mobile-terminated call... 5. LTE to UMTS CSFB by using measurement-based PS handover for LTE UE in idle

mode calling LTE UE in Connected mode ………12 6. LTE to UMTS CSFB by using measurement-based PS handover for LTE UE in

connected mode calling LTE UE in Idle mode ………14 7. LTE to UMTS CSFB by using measurement-based redirection for an idle UE

making a mobile-originated call... 8. LTE to UMTS CSFB by using measurement-based redirection for an idle UE

making a mobile-terminated call... 9. LTE to UMTS CSFB by using measurement-based redirection for a connected UE

making a mobile-originated call... 10. LTE to UMTS CSFB by using measurement-based redirection for a connected UE

making a mobile-terminated call... 11. LTE to UMTS CSFB by using measurement-based redirection for LTE UE in idle

mode calling LTE UE in Connected mode ………26 12. LTE to UMTS CSFB by using measurement-based redirection for LTE UE in

connected mode calling LTE UE in Idle mode ………..29

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1. LTE to UMTS PS handover based on coverage with measurement ………32 2. LTE to UMTS redirection based on coverage with measurement ………34

T01-03 LTE to UTRAN & UTRAN to LTE Reselection

1. LTE to UMTS & UMTS to LTE Reselection based on coverage with measurement …36

1. IRAT Mobility Test

1.1.1 LOFD-001033 CS Fallback to UTRAN

1. LTE to UMTS CSFB by using measurement-based PS handover for an idle UE making a mobile-originated call

Test Preparation

Please backup configurations before test execution.

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in idle mode by using PS handover when the UE makes a mobile-originated CS call.

Tools:

1 UMTS&LTE smartphone UE … Example: (Huawei LTE P1 U9202L-1) 1 UMTS Smartphone UE … Example : (Huawei U8800)

HUAWEI GENEX Probe for HUAWEI terminals

Test Condition :

put static with LTE RSRP>=-85dBm, SINR>=15dB, 3G RSCP>=-85dBm, Ec/Io>= -10dB)

Test Count : 20 times

Prerequisites

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QCI = 9 (by default), , ARP = 11, UL and DL AMBRs = 150 Mbit/s

Configuration :

To enable CSFB to UTRAN and PS handover to UTRAN and disable blind handover, turn on the related switches by running the following MML command on the eNodeB:

MOD ENODEBALGOSWITCH: HoAlgoSwitch=UtranCsfbSwitch-1, HoModeSwitch=UtranPsHoSwitch-1 & BlindHoSwitch-0;

Procedure Excepted Result

1. Powers on UE1 so that it initiates the combined attach procedure to LTE CELL1.

The messages INITIAL UE MSG and the last UL UE MESSAGE (UL NAS TRANS) appear in the S1 tracing result, indicating that the attach procedure is successful.

The UE camps on CELL1.

Note that the UL NAS TRANS message is encrypted. Therefore, to verify that the combined attach is successful, you need to observe the Initial Context Setup Request message in the UE logs or MME tracing result. If EPS attach result contained in this message is combined EPS attach, the attach procedure is successful.

2. Wait 10s and verify that UE1 is in idle

mode. The message RRC Connection Release _{indicates that UE1 has entered idle mode.}

3. Enable UE1 to make a CS call to UE2.

Wait for UE2 to ring. The eNodeB delivers the inter-RAT _{measurement configuration to the UE. The UE} performs inter-RAT measurements. If the signal quality of CELL2 meets the threshold for reporting event B1, the UE reports event B1 to the eNodeB. Then, the eNodeB sends a handover command to the UE.

RRC_MOBIL_FROM_EURAN_CMD message can be seen in the LTE Uu interface tracing log and the PS Handover Complete message can be seen in the RNC Iu interface tracing log indicate that the UE is handed over to the UMTS cell to establish CS call.

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4. After UE2 rings, answer the CS call. _{The CS call is successfully established and the} communication is normal.

5. After Call is finished , then make sure UE1 is disconnected from the UMTS network and reselected to the LTE

6. Repeat Step 2, 3 ,4 & 5 for 20 times

OutPut:

CSSR, Call setup time and DCR (only the call dropped within 10S after call established in 3G will be consider as drop call due to CSFB and will be analyzed).

- Monitor the S1 & UU trace

Remark

Please resume the configuration of the eNodeB after this test. Time required: 1 hour

2. LTE to UMTS CSFB by using measurement-based PS handover for

an idle UE making a mobile-terminated call

Please backup the configuration of the eNodeB before this test.

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in idle mode by using measurement-based PS handover when the UE makes a mobile-terminated CS call.

Tools

1 UMTS&LTE smartphone UE … Example (Huawei LTE P1 U9202L-1) 1 UMTS Smartphone UE … Example (Huawei U8800)

Prerequisites

UE1 is subscribed on the HSS as follows:

Test Condition :

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Configuration :

Note that the message is encrypted.

Therefore, to verify that the combined attach is successful, you need to observe the Initial Context Setup Request message in the UE logs or MME tracing result. If EPS attach result contained in this message is combined eps attach, the attach procedure is

successful.

Wait for UE1 to ring. RRC_MOBIL_FROM_EURAN_CMD _{message can be seen in the LTE Uu interface} tracing log and the PS Handover Complete message can be seen in the RNC Iu interface tracing log indicate that the UE is handed over to the UMTS cell to establish CS call.

4. After UE1 rings, answer the CS call. _{The CS call is successfully established and} the communication is normal.

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6. Repeat Step 2 , 3 , 4 & 5

OutPut:

CSSR, Call setup time and DCR (only the call dropped within 10S after call

established in 3G will be consider as drop call due to CSFB and will be analyzed).

Remark

3. LTE to UMTS CSFB by using measurement-based PS handover for

a connected UE making a mobile-originated call

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in connected mode by using measurement-based PS handover when the UE makes a mobile-originated CS call.

Tools

Prerequisites

Test Condition :

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Configuration :

successful.

2. Make Data application to make UE1 in

Connected mode Open streaming website or do any data _{application to make UE in connected mode}

Wait for UE2 to ring. RRC_MOBIL_FROM_EURAN_CMD _{message can be seen in the LTE Uu interface} tracing log and the PS Handover Complete message can be seen in the RNC Iu interface tracing log indicate that the UE is handed over to the UMTS cell to establish CS call.

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4. After UE2 rings, answer the CS call. The CS call is successfully established and the communication is normal.

5.

After Call is finished , make sure UE1 is disconnected from the UMTS Network and reselected to the LTE network

6. Repeat Step 2 , 3 , 4 & 5

OutPut:

Remark

4. LTE to UMTS CSFB by using measurement-based PS handover for

a connected UE making a mobile-terminated call

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in connected mode by using measurement-based PS handover when the UE makes a mobile-terminated CS call.

Tools

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Prerequisites

Test Condition :

put static with LTE RSRP>=-85dBm , SINR>=15dB, 3G RSCP>=-85dBm , Ec/Io>= -10dB)

Configuration :

successful.

Wait for UE1 to ring. RRC_MOBIL_FROM_EURAN_CMD _{message can be seen in the LTE Uu interface} tracing log and the PS Handover Complete message can be seen in the RNC Iu interface tracing log indicate that the UE is handed

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over to the UMTS cell to establish CS call.

5. After Call is finished , make sure UE1 is disconnected from the UMTS Network and reselected to the LTE network

6. Repeat Step 2 , 3 , 4 & 5 for 20 times

OutPut:

Remark

5. LTE to UMTS CSFB by using measurement-based PS handover for

LTE UE in idle mode calling LTE UE in Connected mode

Objective

This test case aims to verify that the eNodeB performs CS fallback for 2 LTE UEs , One is in idle mode Calling to lte UE in Connected Mode

Tools

2 UMTS & LTE smartphone UE … Example (Huawei LTE P1 U9202L-1)

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Test Condition :

put static with LTE RSRP>=-85dBm, SINR>=15dB

Configuration :

1. Powers on UE1 & UE2 so that it initiates the combined attach

procedure to LTE CELL1.

Note that the UL NAS TRANS message is encrypted. Therefore, to verify that the combined attach is successful, you need to observe the Initial Context Setup Request message in the UE logs or MME tracing result. If EPS attach result contained in this message is combined eps attach, the attach procedure is successful.

Wait for UE2 to ring. RRC_MOBIL_FROM_EURAN_CMD _{message can be seen in the LTE Uu interface} tracing log and the PS Handover Complete message can be seen in the RNC Iu interface tracing log indicate that the UE is handed

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over to the UMTS cell to establish CS call. UE1 is successfully PS handover to UMTS CELL2 to establish a CS call.

UE2 is successfully PS handover to UMTS CELL2 to establish a CS call.

6. After Call is finished , then make Sure UE1 & UE2 are disconnected from the UMTS Network and reselected to the LTE Network

7. Repeat Step 2, 3 , 4 , 5 & 6 for 20 times

OutPut:

Remark

6. LTE to UMTS CSFB by using measurement-based PS handover for

LTE UE in connected mode calling LTE UE in Idle mode

Objective

This test case aims to verify that the eNodeB performs CS fallback for 2 LTE UEs , One is in Connected Calling to lte UE in idle mode

Tools :

2 UMTS&LTE smartphone UE … Example (Huawei LTE P1 U9202L-1)

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Prerequisites

Test Condition :

put static with LTE RSRP>=-85dBm, SINR>=15dB,

Configuration :

1. Powers on UE1 & UE2 so that it initiates the combined attach procedure to LTE CELL1.

Wait for UE2 to ring. RRC_MOBIL_FROM_EURAN_CMD _{message can be seen in the LTE Uu interface} tracing log and the PS Handover Complete message can be seen in the RNC Iu interface

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tracing log indicate that the UE is handed over to the UMTS cell to establish CS call. UE1 is successfully PS handover to UMTS CELL2 to establish a CS call.

UE2 is successfully PS handover to UMTS CELL2 to establish a CS call.

5. After UE2 rings, answer the CS call. The CS call is successfully established and the communication is normal.

7. Repeat Step 2 , 3 , 4 , 5 & 6

OutPut:

Remark

7. LTE to UMTS CSFB by using measurement-based redirection for an

idle UE making a mobile-originated call

Terminal: At least 1 UMTS&LTE smartphone UE and 1 UMTS smartphone UE

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in idle mode by using measurement-beased redirection when the UE makes a mobile-originated CS call.

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Prerequisites

QCI = 9 (by default), ARP = 11, UL and DL AMBRs = 150 Mbit/s

Test Condition :

Configuration :

Enable PS redirection to UTRAN in the obtained inter-RAT handover policy group by running the following MML command on the eNodeB:

MOD INTERRATPOLICYCFGGROUP: InterRatPolicyCfgGroupId=3, UtranHoCfg=PS_HO-0&SRVCC-0&REDIRECTION-1;

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Wait for UE2 to ring. The eNB sends RRC Connection _{Reconfiguration with B1 measurement control} message to UE and receive B1 measurement from UE.

The redirected carrierInfo IE in the RRC_CONN_REL message on the Uu interface and the Routing Area Update Request message in the Initial UE message on the Iu interface indicate that the redirection successfully.

UE1 is successfully redirected to UMTS CELL2 to establish a CS call.

6. Repeat Step 2, 3 ,4 & 5 for 20 times

OutPut:

CSSR, Call setup time and DCR (only the call

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dropped within 10S after call

Remark

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8.LTE to UMTS CSFB by using measurement-based redirection for

an idle UE making a mobile-terminated call

Please backup configurations before test execution. Terminal: At least 1 UMTS&LTE UE and 1 UMTS UE

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in idle mode by using measurement-beased redirection when the UE makes a mobile-terminated CS call.

Tools :

Prerequisites

Test Condition :

Configuration :

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6. Repeat Step 2 , 3 , 4 & 5

OutPut:

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Remark

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9. LTE to UMTS CSFB by using measurement-based redirection for a

connected UE making a mobile-originated call

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in connected mode by using measurement-beased redirection when the UE makes a mobile-originated CS call.

Tools :

Prerequisites

Test Condition :

Configuration :

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5. Repeat Step 2 , 3 , 4 & 5

OutPut:

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Remark

7. LTE to UMTS CSFB by using measurement-based redirection for a

connected UE making a mobile-terminated call

Objective

This test case aims to verify that the eNodeB performs CS fallback for a UE in connected mode by using measurement-beased redirection when the UE makes a mobile-terminated CS call.

Tools :

Test Condition :

Prerequisites

Configuration :

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4. fter UE1 rings, answer the CS call. _{The CS call is successfully established and} the communication is normal.

6. Repeat Step 2 , 3 , 4 & 5 for 20 times

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Remark

8. LTE to UMTS CSFB by using measurement-based redirection for

LTE UE in idle mode calling LTE UE in Connected mode

Objective

This test case aims to verify that the eNodeB performs CS fallback for 2 LTE UEs by using measurement-beased redirection when LTE UE in idle mode calling LTE UE in Connected mode

Tools :

Prerequisites

UE1 and UE2 are subscribed on the HSS as follows:

QCI (by default), = 9, ARP = 11, UL and DL AMBRs = 150 Mbit/s

Test Condition :

put static with LTE RSRP>=-85dBm, SINR>=15dB,

Test Count : 20 times Configuration :

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3. Make Data application to make

UE2 in Connected mode Open streaming website or do any data _{application to make UE in connected mode}

Enable UE1 to make a CS call to UE2. Wait

for UE2 to ring. The eNB sends RRC Connection _{Reconfiguration with B1 measurement control} message to UE and receive B1 measurement from UE.

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the communication is normal.

4. Repeat Step 2, 3 , 4 , 5 & 6 for 20 times

OutPut:

Remark

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9. LTE to UMTS CSFB by using measurement-based redirection for

LTE UE in connected mode calling LTE UE in Idle mode

Objective

This test case aims to verify that the eNodeB performs CS fallback for This test case aims to verify that the eNodeB performs CS fallback for 2 LTE UEs by using measurement-beased redirection when LTE UE in Connected mode calling LTE UE in idle mode

Tools :

Prerequisites

UE1 and UE2 are subscribed on the HSS as follows:

QCI = 9(by default),, ARP = 11, UL and DL AMBRs = 150 Mbit/s

Test Condition :

put static with LTE RSRP>=-85dBm, SINR>=15dB

Test Count : 20 times Configuration :

The messages INITIAL UE MSG and the last UL UE MESSAGE (UL NAS TRANS) appear in the S1 tracing result, indicating that the

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attach procedure is successful. The UE camps on CELL1.

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7. Repeat Step 2 , 3 , 4 , 5 & 6

OutPut:

Remark

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T01-02 L2U IRAT

.1 LTE to UMTS PS handover based on coverage with measurement Objective

This test case aims to verify that the eNodeB supports inter-RAT PS handovers due to coverage changes.

Tools :

Test Condition :

Perform downlink data transmission from the FTP Server ,Select One Point at the LTE Cell edge at RSRP<= -110 , then Start to move from the lte coverage to the UMTS Coverage till Handover occur from LTE to UMTS

Prerequisites

The UE is subscribed on the HSS as follows:

QCI = 9 (by default),, ARP = 11, UL and DL AMBRs = 150 Mbit/s

Procedure Expected Result

Power on the UE so that it initiates the attach

procedure. The UE attaches to CELL1.

Use FTP tool or Iperf to perform downlink

data transmission. Data is transmitted properly.

Enable the UE to leave the LTE cell and approach the UMTS cell until a handover is triggered.

The UE reports event A2 to the eNodeB. After receiving the report, the eNodeB delivers the inter-RAT measurement configuration to the UE. The UE performs inter-RAT

measurements. If the signal quality of the UMTS cell meets the threshold for reporting event B1, the UE reports event B1 to the

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eNodeB. Then, the eNodeB sends a handover command to the UE.

The RRC_MOBIL_FROM_EURAN_CMD message in the LTE Uu interface tracing log and the Handover to UTRAN Complete in Uu interface and PS Handover Complete

messages in the RNC Iu interface tracing log indicate that the UE is handed over to the UMTS cell.

The data transmission in UMTS side is normal.

Disconnect the UE and save the logs. Operation succeeded.

Output :

Inter-RAT Handover Success Rate Time Latency

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.2 LTE to UMTS redirection based on coverage with measurement Objective

This test case aims to verify that the eNodeB supports inter-RAT redirections due to coverage changes.

Tools :

1 UMTS&LTE smartphone UE … Example (Huawei LTE P1 U9202L-1) HUAWEI GENEX Probe for HUAWEI terminals

Test Condition :

Perform downlink data transmission from the FTP Server ,Select One Point at the LTE Cell edge at RSRP<= -110 , then Start to move from the lte coverage to the UMTS Coverage till Redirection occur from LTE to UMTS

Test Count : 20 times Prerequisites

QCI = 9 (by default),, ARP = 11, UL and DL AMBRs = 150 Mbit/s

Power on the UE so that it initiates the attach

procedure. The messages INITIAL UE MSG and the last _{UL UE MESSAGE (UL NAS TRANS) appear} in the S1 tracing result, indicating that the attach procedure is successful.

The UE attaches to CELL1.

Use FTP tool or Iperf to perform downlink

data transmission. Data is transmitted properly.

Enable the UE to leave the LTE cell and approach the UMTS cell until a redirection is triggered.

The UE reports event A2 to the eNodeB. After receiving the report, the eNodeB delivers the inter-RAT measurement configuration to the UE. The UE performs inter-RAT

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measurements. If the signal quality of the UMTS cell meets the threshold for reporting event B1, the UE reports event B1 to the eNodeB. Then, the eNodeB sends a redirection command to the UE. The redirected carrierInfo IE in the RRC_CONN_REL message on the Uu interface indicates that the redirection is triggered successfully.

The Routing Area Update Request message in the Initial UE message on the Iu interface indicates that the redirection procedure is successful.

The data transmission in UMTS side is normal.

Disconnect the UE and save the logs. _{Operation succeeded.}

Output:

Redirection Attempt Success Rate Time Latency

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T01-03 LTE to UTRAN & UTRAN to LTE Reselection

1. LTE to UMTS & UMTS to LTE Reselction based on coverage with measurement

Objective

This test case aims to verify that the eNodeB supports reselection due to coverage changes.

Tools :

Test Condition :

Make Sure UE are in idle mode , then Select One Point at the LTE Cell edge at RSRP<= -110 , then Start to move from the lte coverage to the UMTS Coverage till reselection from LTE to UMTS occur , then return back from the UMTS Coverage to the LTE Coverage till reselection from UMTS to LTE is done

Prerequisites

QCI = 9 (by default),, ARP = 11, UL and DL AMBRs = 150 Mbit/s

1. Power on the UE so that it initiates

the attach procedure. The UE attaches to CELL1.

3. Enable the UE to leave the LTE cell and approach the UMTS cell until a reselection is happened

4. Return back moving from the UMTS towards the LTE Coverage , till Reselection from UMTS to LTE is happened

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5. Repeat Step 2 , 4 & 4 for 20 times

Output : Time Latency