Telkomsel LTE FDD Interworking Strategy_V1.1

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Telkomsel LTE Interworking Strategy (LTE900 + UMTS + GSM) www.huawei.com

HUAWEI TECHNOLOGIES Co., Ltd.

Document Revision Record Date

Versio n

22/8/2014

1.0

Description

Remark

Initial Version

Yeoh Yee Chin (HW)

Remark: 1. 2.

All the parameters and MML commands in this document are based on eRAN6.0 Parameters may require fine tune according to live network environment during optimization stage

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Author

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Overview of Interworking Strategy Idle Mode • L900  L900: Intra-frequency reselection based on coverage • L900  U2100/G1800/G900: Reselection based on coverage • U2100/G1800/G900  L900: Reselection based on priority

LTE 900

L900

LTE 900

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

F1 U2100 F2 U2100

F3 U2100

G1800/900

GSM 1800/900 Cell A

GSM 1800/900 Cell B

GSM 1800/900 Coverage Trigger

Cell C

Priority Trigger

• Note: LTE DCS1800 relationship will be defined in Inner City and LTE GSM900 will be defined in outer city. HUAWEI TECHNOLOGIES CO., LTD.

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Overview of Interworking Strategy Connected Mode • L900  L900: Intra-frequency handover based on coverage • L900  U2100/G1800/G900: Inter-RAT PS Handover/redirection for PS service, CSFB by redirection for CS service • U2100/G1800/G900 L900: Redirection for PS Service LTE 900

L900

LTE 900

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

UMTS 2100

F1 U2100 F2 U2100 F3 U2100

GSM 1800/900*

GSM 1800/900*

G1800/900

GSM 1800/900*

Coverage Based

Cell A

Cell B

U->L Fast Return (SRAN8.0 above)

Cell C

G->L Fast Return (SRAN7.0 above)

⃰ Note: LTE DCS1800 relationship will be defined in Inner City and LTE GSM900 will be defined in outer city.

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CSFB

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LTELTE Intra-Freq – Idle Mode Cell Reselection • Intra-frequency cell reselection is triggered when UE moves out of the serving cell coverage area. • UE starts intra-frequency measurements if:  SServingCell ≤ SIntraSearch

• Condition of cell-ranking for the serving cell and neighboring cells:  Rs = Qmeas,s + Qhyst  Rn = Qmeas,n – CellQoffset

LTE 900

LTE 900

LTE 900

RSRP

• Condition of cell reselection:  The new cell is ranked higher than the serving cell, Rn > Rs for a time period of TReselEutran.  The UE has camped on the serving cell for more than 1second.

L900

TReselEutran

Qmeas,s Qmeas,n

- 70dBm

●

Qmeas,s+Qhyst

Cell A

Cell B

Cell C

Coverage Trigger

SIntraSearch QRxLevMin -128dBm

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Rn > Rs Trigger cell reselection

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Time

LTELTE Intra-Freq – Idle Mode Cell Reselection Default value

Recommend value

SIntraSearchCfgI nd

CFG Range: NOT_CFG, CFG

CFG (configure)

SIntraSearch

29 Range: 0~31 Unit: 2dB

29 [2dB] (-70dBm)

4 Range: 0~24 Unit:dB

DB4_Q_HYST

QRxLevMin

-64 Range: -70~-22 Unit: 2dBm

-64 [2dBm] (-128dBm)

TReselEutran

1 Range: 0~7 Unit: s

1 [s]

-64 Range: -70~-22 Unit: 2dBm

-64 [2dBm] (-128dBm)

LTE Parameter

Qhyst

QRxLevMin

MML Command

MOD CELLRESEL

MOD CELLSEL

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Comments Enable the measurement triggering threshold for intrafrequency cell search Measurement triggering threshold for intra-frequency cell reselection Absolute value = 2*QRxLevMin + 2*SIntraSearch (=2*-64 + 2*29 = -128+58= -70dBm) Hysteresis value for ranking criteria

Minimum required RSRP level

Timer value for EUTRAN cell reselection

Minimum required RSRP level for the cell to become a candidate for cell selection

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Inter-RAT – Idle Mode Cell Reselection • Propose to set L900 to higher reselection priority than U2100 & GSM1800/900. • LTE capable UE always prefer to camp on LTE due to higher cell priority than UMTS/GSM. • UE performs cell reselection to F1 U2100 only when LTE signal is low and UMTS signal fulfill the cell reselection triggering threshold. • Absolute priority will be set for both LTE and UMTS network to facilitate cell reselection preference to LTE network. It is not possible to set the same priority for LTE and UMTS network. Absolute priority is broadcasted in the SIB message and it affects cell reselection process. • Absolute priority ranges from 0 to 7, where 7 indicate the highest priority and 0 indicate the lowest priority. Priority

Telkomsel System

7 6

LTE

Range use for LTE/Future Use

5 4

UMTS Range use for UMTS

3 2 1

GSM Range use for GSM

0

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Inter-RAT – Idle Mode Cell Reselection Reselection from L900 to U2100 Lower Priority Cell • UE starts inter-RAT measurements if :  SServingCell ≤ SNonIntraSearch • UE performs cell reselection to U2100 lower priority inter-RAT cell when all the following conditions are met:  No cell meets the criteria for reselection to higher priority cells  SServingCell < Threshserving,Low for a time period of TReselUTRAN.  SNonServingCell,x > Threshx,Low for a time period of TReselUTRAN.  The UE has camped on the serving cell for more than 1second. RSRP

TReselUTRAN

SNonServingCell,x U2100 (RSCP)

SServingCell LTE - 103dBm - 114dBm - 114dBm

Threshx,Low SNonIntraSearch

●

Threshserving,Low

QRxLevMin -128dBm Trigger cell reselection

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Time

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Inter-RAT – Idle Mode Cell Reselection Reselection from U2100 to L900 Higher Priority Cell

• If different reselection priority are set for different LTE frequency, then UE will search for the highest priority frequency, if no suitable cell then select second priority frequency.

RSRP

• UE performs cell reselection to a higher priority inter-frequency cell when all the following conditions are met:  SNonServingCell,x > ThdToHigh for a time period of TResel.  The UE has camped on the serving cell for more than 1second.

- 110dBm

TResel

SServingCell U2100

SNonServingCell,x L900

ThdToHigh

●

QRxLevMin -128dBm

Trigger cell reselection

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Time

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LTE -> UMTS Inter-RAT – Idle Mode Cell Reselection Default value

Recommend value

CellReselPriority

1 Range: 0~7

6 for L900

Cell reselection priority of the serving frequency. L900 has higher priority than U2100.

SNonIntraSearch CfgInd

CFG Range: NOT_CFG, CFG

CFG (configure)

Enable the measurement triggering threshold for inter-frequency or interRAT cell reselection

10 Range: 0~31 Unit: 2dB

7 [2dB] (-114dBm)

Measurement triggering threshold for inter-frequency or inter-RAT cell search Absolute value = 2*QRxLevMin + 2*SNonIntraSearch (=2*-64+2*7 = -128+ 14= -114dBm)

ThreshServLow

10 Range: 0~31 Unit: 2dB

7 [2dB] (-114dBm)

Triggering threshold for inter-frequency or inter-RAT cell reselection to a cell on lower priority frequency Absolute value = 2*QRxLevMin + 2*ThreshServLow (=2*-64+2*7 = -128 + 14= -114dBm)

QRxLevMin

-64 Range: -70~-22 Unit: 2dBm

-64 [2dBm] (-128dBm)

Minimum required RSRP level for the LTE cell to become a candidate for cell selection

LTE Parameter

SNonIntraSearch

MML Command

MOD CELLRESEL

MOD CELLSEL

Comments

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LTE -> UMTS Inter-RAT – Idle Mode Cell Reselection LTE Parameter

MML Command Default value

Recommend value

Comments

CellReselPriorityC fgInd

NOT CFG Range: NOT_CFG, CFG

CFG (configure)

Enable the inter-RAT cell reselection priority

CellReselPriority

1 Range: 0~7

4 for UMTS

Cell reselection priority of the neighboring UTRAN frequency.

ThreshXLow

6 Range: 0~31 Unit: 2dB

6 [2dB] (-103dBm)

Minimum RSCP level required for neighboring UTRAN cell to become a candidate for reselection if the priority of the UTRAN frequency is lower than or equal to that of the serving frequency Absolute value = (2*QRxLevMin + 1) + 2*ThreshXLow [((2*-58+1)+2*6)= -115 + 12= -103dBm]

PmaxUTRAN

33 Range: -50~33 Unit: dBm

24 [dBm]

QRxLevMin

-58 Range: -60~-13 Unit: 2dBm

-58 [2dBm] (-115dBm)

1 Range: 0~7 Unit: s

1 [s]

TReselUTRAN

ADD UTRANNFREQ

ADD CELLRESELUT RAN

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Maximum allowed UE transmission power in UTRAN

Minimum required RSCP level Absolute value = 2*QRxLevMin + 1 (2*-58+1= -116+1= -115dBm) Timer value for LTE to UTRAN cell reselection

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UMTS -> LTE Inter-RAT – Idle Mode Cell Reselection UMTS Parameter

MML Command

Default value

Recommend value

SPriority

MOD UCELLSELRESEL

4

4 for U2100

SibCfgBitMap

ADD UCELLSIBSWITC H

SIB19-0

SIB19-1

NodeBProtclVer

MOD UNODEB

NA

R9

NA Range: 0~7

6

NPriority

ThdToHigh

EQrxlevmin

2 ADD Range: 0~31 UCELLNFREQPRI Unit: 2dB OINFO -70 Range: -70~22 Unit: 2dBm

Comments U2100 has lower priority than L900 Enable UTRAN send SIB19 messages to UE for UMTS to LTE reselection Set NodeB protocol version to R9. If lower than R8, then U2L interworking feature may not working

LTE cell reselection priority

9 [2dB] (-110dBm)

RSRP level required for LTE neighboring cell to become a candidate for reselection if the priority of the frequency is higher than that of the serving frequency Absolute value = 2*EQrxlevmin + 2*ThdToHigh (-128 +18= 110dbm)

-64 [dBm] (-128dBm)

Minimum required RSRP level

• In the UMTS network, SIB19 includes the absolute priority of the serving cell and the absolute priority of each LTE frequency. When an LTE frequency has a higher absolute priority than the serving cell, the UE reselects an LTE cell on this frequency if other additional conditions for LTE cell reselection are also met. When the absolute priority of each LTE frequency is lower than that of the serving cell, the UE reselects another UMTS cell if other additional conditions for UMTS cell reselection are also met.

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LTE -> GSM Inter-RAT – Idle Mode Cell Reselection LTE Parameter

MML Command

CellReselPriorityCfgI nd CellReselPriority

ThreshXLow

QRxLevMin

TReselGeran

Default value 1

ADD CFG GERANNFREQ GROUP(All 7 GERAN Range: 0~31 carriers within Unit: 2dB LTE coverage area) 0 Range: 0~45 Unit: 2dBm ADD CELLRESELG ERAN

1 Range: 0~7 Unit: s

Recommend value

Comments

1 for Enable the cell reselection priority configuration GSM1800/900 CFG (configure)

GERAN priority is the lowest

7 [2dB] (-99dBm)

Rx signal level threshold used in reselection to neighboring cells on a lower priority GERAN frequency 2*QRxLevMin+2*ThreshXLow (-113 + 7*2 = -99dBm)

1 [2dB] (-113dBm)

Minimum RSSI level to camp on GERAN 2*QRxLevMin-min QRxLevMin(1*2 -115+= -113dBm)

1s

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Cell reselection duration of GERAN cell reselection

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GSM -> LTE Inter-RAT – Idle Mode Cell Reselection Default value

Recommend value

GERANPRI

1 Range: 0~7

1

GERAN priority is the lowest (Always look for LTE)

EUTRANPRI

6 Range: 0~7

6

LTE cell reselection priority

6 Range: -78~-140

6 (-128dBm)

Minimum RSRP level to camp on LTE

20 Range: 0~31

9 [2dB] (-110dBm)

If the measured RSRP value of one or more neighboring EUTRAN cells is higher than the value of this parameter, the MS is allowed to reselect a neighboring cell in EUTRAN whose priority is higher than the GERAN priority.

Support

Support

GERAN Parameter

MML Command

SET GCELLPRIEUTRAN SYS (All GERAN EUTRANQRXLEVM carriers within LTE IN coverage area) THREUTRANHIGH

SPTRESEL

ADD GLTENCELL(All GERAN carriers)

Comments

Support cell reselection to LTE cell

All GSM cells within LTE coverage area need to enable GSM to LTE reselection.

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LTE Event for handover/redirection Event

Meaning

A1

Serving becomes better than threshold

A2

Serving becomes worse than threshold

A3

Neighbor becomes offset better than serving

A4

Neighbor becomes better than serving

B1

Inter RAT neighbor becomes better than threshold

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LTELTE Intra-Freq Handover • Intra-frequency handovers are triggered by event A3. • When the signal quality in at least one intra-frequency neighboring cell meets the configured triggering condition of event A3, the UE sends the measurement result to the eNodeB. • Event A3 entering condition:  Mn + Ofn + Ocn – Hys > Ms + Ofs + Ocs + Off

LTE 900

• Event A3 leaving condition:  Mn + Ofn + Ocn + Hys < Ms + Ofs + Ocs + Off

LTE 900

LTE 900

Coverage Based

RSRP

TimeToTrigger

Cell A Ms ●

Mn

Event A3 is triggered Time

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L900

Cell B

Parameter Mn

Value N/A

Ofn

0

Ocn Hys

0 4

Ms

N/A

Ofs

0

Ocs

0

Off

2

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Cell C

Description Obtained from UE’s RSRP Measurement of neighbouring intrafreq LTE cells Frequency specific offset of the frequency of the neighbour cell Cell specific offset of the neighbour cell Hysteresis parameter for this event. Actual value = IE value * 0.5 (dB) Obtained from UE’s RSRP Measurement of serving LTE cell Frequency specific offset of the serving frequency Cell specific offset of the serving cell Offset parameter for this event, i.e. a3-Offset. Actual value = IE value * 0.5 (dB)

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LTELTE Intra-Freq Handover MML Command

Default value

Recommend value

2 Range: 0~30 Unit: 0.5dB

2 (1dB)

Intra-frequency handover hysteresis for event A3

2 Range: -30~30 Unit: 0.5dB

2 (1dB)

Intra-frequency handover offset for event A3

IntraFreqHoA3TimeToTrig

320 Range: 0~5120ms

320 [ms]

IntraFreqHoA3TrigQuan

RSRP Range: RSRP, RSRQ

RSRP

A3 measurement trigger quantity

RSRP

A3 measurement report quantity

LTE Parameter

IntraFreqHoA3Hyst MOD INTRAFREQ HOGROUP

IntraFreqHoA3Offset

IntraFreqHoA3RprtQuan

IntraFreqHoRprtInterval

RSRP MOD Range: INTRARATH SAME_AS_TRIG_ OCOMM QUAN(Same as Trig Quan) 240 Range:120ms60min

240 [ms]

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Comments

Intra-frequency handover time-to-trigger for event A3

Intra-frequency measurement report interval

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LTE -> UMTS Inter-RAT – PS Connected • In a coverage-based inter-RAT redirection, event A2 triggers inter-RAT measurements:  Entering condition: Ms + Hys < Thresh  Leaving condition: Ms – Hys > Thresh • In a coverage-based inter-RAT redirection, event A1 stops inter-RAT measurements:  Entering condition: Ms – Hys > Thresh  Leaving condition: Ms + Hys < Thresh • The triggering of event B1 indicates that at least one neighboring cell signal quality is higher than specified threshold:  Entering condition: Mn + Ofn – Hys > Thresh  Leaving condition: Mn + Ofn + Hys < Thresh Parameter

Value

Ms

N/A

Thresh

-116 dBm (RSRP)

Hys InterFreqHoA1 A2TimeToTrig

Description Obtained from UE Measurement. RSRP Threshold for A2 event A1A2 Hysteresis. Actual value = IE value * 0.5 (dB) Actual value = 1 dB

2 640 ms

Time To Trigger

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Parameter

Mn

Value -103 dBm N/A

Ofn

0

Hys

2

InterRatHoUtra nB1TimeToTrig

640 ms

Thresh

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Description Threshold for B1 event trigger Obtained from UE Measurement Frequency specific offset of the frequency of the neighbour cell B1 Hysteresis。 Actual value = IE value * 0.5 (dB) Actual value = 1 dB Time To Trigger

LTE -> UMTS Inter-RAT – PS Redirection Default value

Recommend value

LTE Parameter

MML Command

HoModeSwitch

UtranRedirectS UtranRedirectS Enable redirection from LTE to UTRAN switch MOD witch:Off witch:On ENODEBALGOS UtranPsHoSwitc UtranPsHoSwitc WITCH Enable PS handover from LTE to UTRAN switch h:Off h:Off RSRP Range: RSRP, RSRQ, BOTH

InterRatHoA1A2TrigQuan

MOD INTERRATHOCO UTRAN_RSCP MM InterRatHoUtranB1Meas Range: RSCP, Quan ECN0, BOTH

Comments

RSRP

Inter-RAT A1/A2 measurement trigger quantity

RSCP

UTRAN measurement trigger quantity

InterRatHoA1ThdRsrp

-111 Range: -141~-43 Unit: dBm

-111 [dBm]

RSRP threshold for inter-RAT measurement event A1

InterRatHoA2ThdRsrp

-115 Range: -141~-43 Unit: dBm

-115 [dBm]

RSRP threshold for inter-RAT measurement event A2

2 Range: 0~30 Unit: 0.5dB

2 (1dB)

640 Range: 0ms~5120ms

640 [ms]

InterRatHoA1A2Hyst

InterRatHoA1A2TimeToT rig

ADD INTERRATHOCO MMGROUP

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Hysteresis for inter-RAT measurement event A1/A2

Time-to-trigger for inter-RAT measurement event A1/A2

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LTE -> UMTS Inter-RAT – PS Redirection LTE Parameter

MML Command

InterRatHoUtranB1Thd Rscp ADD INTERRATHOU InterRatHoUtranB1Hyst TRANGROUP

InterRatHoUtranB1Time ToTrig

BlindHoPriority

ADD UTRANNCELL

Default value

Recommend value

-103 Range: -120~25 Unit: dBm

-103 [dBm]

2 Range: -120~25 Unit: dBm

2 [0.5dB] (1dB)

Hysteresis for inter-RAT HO event B1

640 Range: 0ms5120ms

640 [ms]

Time-to-trigger for inter-RAT HO event B1

0 Range: 0~32

Comments

RSCP threshold for event B1 related to coveragebased inter-RAT HO to UTRAN

32 for co-locate Configure co-locate U2100 F1 cell as blind HO U2100 cell neighboring cell to comply the UE that do not support 0 for other cells UTRAN measurement.

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LTE -> GSM Inter-RAT – PS Redirection LTE Parameter

HoModeSwitch

MML Command

Default value

Recommend value

GeranRedirect Switch-0

GeranRedirect Enable Redirection to GERAN switch Switch-1

Comments

MOD ENODEBALGOSW GeranPsHoSwi GeranPsHoSwi Enable PS handover to GERAN switch only in future ITCH tch-0 tch-0 if UE support L2G HO BlindHoSwitch- BlindHoSwitch- Disable blind handover switch, take L2G redirection 0 0 based on measurement

BlindHoPriority

ADD GERANNCELL

InterRatHoGeranB1T hd ADD InterRatHoGeranB1Ti INTERRATHOGER meToTrig ANGROUP

InterRatGeranB1Hyst

0 Range: 0~32

32 for co-locate G1800/900 cell, Configure GERAN as blind handover neighboring 0 for other cell neighbor cell

-95dBm Range: -110~48 Unit: dBm

-95dBm

RSSI threshold for event B1 that is used in HO to GERAN

640ms Range: 0ms~5120ms

640ms

Time to trigger for event B1 related to inter-RAT handover to GERAN

1dB Range: 0~30 Unit: 0.5dB

1dB

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Hysteresis for event B1 related to inter-RAT handover to GERAN

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CS Fallback (CSFB) • CSFB (CS Fallback Function) is specified by ETSI TS 123 272 v10.6.0 and is a mandatory requirement which supports “traditional” CS voice in LTE networks prior to IMS (IP Multimedia Subsystem) deployment. • In the overlaid coverage of LTE and UMTS, UMTS provides voice service for the multi-mode UE. When CSFB voice service is initiated, the LTE data service will be handed / redirected over to UMTS network. • The benefit of having CSFB is that voice service can be deployed quickly reusing traditional UMTS core with no additional equipment, thus saving on cost and minimizing new investment. • In addition, it also guarantees users data service continuity when re-direction or handover of the PS service occurs.

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CSFB to UMTS (PS RRC Redirection) MO call (R9: with RIM, Flash CSFB) (RIM: RAN Information Management)

MO call (R8: without RIM) UE

eNodeB

RNC

MME

MSC

SGSN

UE

1.Extended Service Request (containing a CS Fallback Indicator)

eNodeB

RNC

MME

MSC

SGSN

1.Extended Service Request (containing a CS Fallback Indicator) 2.S1-AP Message with CS Fallback Indicator

2.S1-AP Message with CS Fallback Indicator S1-AP Reponse Message

S1-AP Reponse Message 3.Optional measurement report

3.Optional measurement report 4. RRC Connection Release with UTRAN frequency

4. RRC Connection Release with UTRAN frequency\cell id\cell System information

S1 UE context release

S1 UE context release

5. LAU, combined RAU/LAU, or RAU and LAU PS Suspend

5. LAU, combined RAU/LAU, or RAU and LAU PS Suspend

6.CS call establishment procedure

6.CS call establishment procedure

* MT call’s procedure is similar. * R8 CSFB is adapted in Telkomsel LTE network

* If the handover switch is turned from E-UTRAN to UTRAN, and UE support the handover, then LOFD-001052 Flash CS Fallback to UTRAN for the UE will be disabled. That is, all Inter-RAT procedures to the UTRAN including CSFB will preferentially be performed based on handovers if handovers to the UTRAN is enabled and UEs are capable of such handovers.

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LTE -> UMTS Inter-RAT – CSFB by Redirection LTE Parameter HoAlgoSwitch

HoModeSwitch

MML Command

Default value

Recommend value

Comments

UtranCsfbSwitch UtranCsfbSwitch:Off Enable CSFB to UTRAN switch MOD :On ENODEBALG BlindHoSwitch:O OSWITCH BlindHoSwitch:Off Enable blind HO switch to perform CSFB ff

CsfbHoUtranB1ThdR scp

MOD CSFALLBACK HO CsfbHoUtranTimeToT rig

-106 Range: -120~-25 Unit: dBm

-100 [dBm]

RSCP threshold for event B1 that is used in CSFB to UTRAN

40 Range: 0ms~5120ms

40 [ms]

Time-to-trigger for event B1 that is used in CSFB to UTRAN

LTE -> GSM Inter-RAT – CSFB by Redirection LTE Parameter HoAlgoSwitch HoModeSwitch

CsfbHoGeranB1Thd

MML Command

Default value

Recommend value

Comments

GeranCsfbSwitch: GeranCsfbSwit Enable CSFB to Geran switch MOD Off ch:On ENODEBALGO BlindHoSwitch: SWITCH BlindHoSwitch:Off Enable blind HO switch to perform CSFB to Geran Off

MOD CSFALLBACKH O CsfbHoGeranTimeTo Trig

-95 Range: -110~-48 Unit: dBm

-95 [dBm]

RSSI threshold for event B1 that is used in CSFB to Geran

320 Range: 0ms~5120ms

320 [ms]

Time-to-trigger for event B1 that is used in CSFB to Geran (Higher than Utran to do CSFB to Utran first)

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UMTS/GSM to LTE Fast Return 

Huawei Fast Return from UMTS/GSM to LTE feature enables a UE that moves from an LTE cell to a UMTS cell through CSFB to quickly return to the LTE network after the CS service ended, by eNodeB sending target LTE frequency from UMTS/GSM when UE release the CS call, in the RRC release/Channel release message, not waiting for PS service disconnected.



This feature will help user to return to LTE in time, to utilize LTE network for PS services.



Recommended implementation to UMTS/GSM cells with co-located LTE cells or within fully continuous LTE coverage area, to avoid UE fail to go back to LTE in areas that LTE coverage is not enough for UE to register then cause UE lost service before UE reselect back to UMTS. 

Since now Telkomsel LTE network is just started, LTE cannot provide fully continuous coverage, so fast return is only enabled in co-located 3G/2G cells.



Thus in case if UE make CSFB call to 3G/2G, but UE move to another neighboring cell without co-located LTE site, then Fast Return wouldn’t trigger, thus UE have to wait all background PS service release (if any), especially for smartphone user with many background PS connections. Thus user might experience relatively “slow” back to LTE (typically 1~2 minutes if user is not intended to access internet).

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UMTS -> LTE Fast Return UMTS Parameter

MML Command

Default value

Recommend value

Comments

FastReturnToL TESwitch

HO_UMTS_TO_LTE HO_UMTS_TO_LTE_F MOD UCELLHOCO _FAST_RETURN_S AST_RETURN_SWITC Enable UMTS to LTE Fast Return WITCH=0 H=1 MM

FastReturnToL TESwitch

(all carriers of the UMTS cell which co-site with LTE)

PERFENH_PS_FAS PERFENH_PS_FAST_ T_RETURN_LTE_S RETURN_LTE_SWITC Enable UMTS to LTE Fast Return WITCH=0 H=1

GSM ->LTE Fast Return GSM Parameter

MML Command

Default value

ADD GLTENCELL SPTRAPIDSEL (all carriers of the NOT_SUPPORT GSM cell which co-site with LTE)

Recommend value

SUPPORT

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Comments

Enable GSM to LTE Fast Return

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