GUL Inter-working Strategy MBF LTE 530 Project
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LTE Spectrum 1800MHz band:
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2600MHz band: - Band width : 20MHz UL from 2530 – 2550 MHz DL from 2650 – 2670 MHz
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Two ways One way
Inter-working Overview Idle Mode- Cell Reselection
Connected Mode- Voice
Connected Mode- Data
LTE with higher priority
Prefer 4G
Fast Return
CSFB
U2100 F1/U900 Prefer 4G
Prefer 3G
G900/G1800 • •
L1800/L2600
L1800/L2600
L1800/L2600
L->U Coverage Handover
L->U reselection in IDLE or PCH states
U2100 F1/ U900
U2100 F1/ U900
Prefer 3G
Coverage/Load based
G900/G1800
G900/G1800
In idle mode, UE prefer camping on 4G, otherwise prefer camping on 3G U2100 or U900, last to 2G. UE in 3G will always try to reselect to 4G, and UE in 2G will always try to reselect to 3G or 4G ( if UE support). UE reselect from 4G to 3G, UE on 4G setup CS service will CSFB to 3G U2100 F1 or U900. (LTE Macro cell CSFB to UMTS F1/ U900,
LTE IBS cell CSFB to UMTS F3) HUAWEI TECHNOLOGIES CO., LTD.
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LTE Parameter - Idle Mode Cell Reselection (LTE coverage center) Priority
RAT
7
Reserved
6
L2600
5
L1800
4
Reserved
3
U2100
2
U900
Reselection from LTE to UMTS: (Coverage based) UE will start to measure UMTS signal when: LTE signal < -110dBm UE will reselect to UMTS when: LTE signal < -114dBm & UMTS signal > -103dBm, The signal conditions need to maintenance for 1 second. Reselection from LTE to GSM: (Coverage based) UE will start to measure UMTS signal when: LTE signal < -110dBm UE will reselect to UMTS when: LTE signal < -114dBm & GSM signal > -101dBm, The signal conditions need to maintenance for 1 second.
1
G900\1800
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LTE Parameter - Idle Mode Cell Reselection (LTE coverage border) Priority
RAT
7
Reserved
6
L2600
5
L1800
4
Reserved
3
U2100
2
U900
Reselection from LTE to UMTS: (Coverage based) UE will start to measure UMTS signal when: LTE signal < -102dBm UE will reselect to UMTS when: LTE signal < -106dBm & UMTS signal > -100dBm, The signal conditions need to maintenance for 1 second. Reselection from LTE to GSM: (Coverage based) UE will start to measure UMTS signal when: LTE signal < -102dBm UE will reselect to UMTS when: LTE signal < -106dBm & GSM signal > -101dBm, The signal conditions need to maintenance for 1 second.
1
G900\1800
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LTE Parameter - Idle Mode Cell Reselection Scenario
L2GU
Parameter
MML
CellReselPriority
5/6
SNonIntraSearchCfgInd
CFG
SNonIntraSearch
CELLRESEL
QRxLevMin QQualMin
CELLSEL
CellReselPriority
3 UTRANNFREQ
-58
ThreshXLow
6, border cell 8
PmaxUtran
24 CELLRESELUTRAN
CellReselPriorityCfgInd CellReselPriority QRxLevMin
Cell reselection priority -115dBm
UE maximum power
1 CFG
GERANNFREQGROUP
ThreshXlow TReselGeran
Start measurement, QRxLevMin*2+SNonIntraSearch*2=-128+9*2=-110
-18 CFG
QRxLevMin
Cell reselection priority(L1800-5/L2600-6)
-64
CellReselPriorityCfgInd
TreselUtran
L2G Reselection
9, border cell 13
Remark
7, border cell 11
ThrshServLow
L2U Reselection
Setting
CELLRESELGERAN
1
Cell reselection priority
0
-115dBm
7
14dB
1
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LTE Parameter - Connected Mode - Voice CSFB Scenario
CSFB Common
Parameter
MML
Setting
HoModeSwitch:BlindHoSwitch
ENODEBALGOSWITCH
1
HoModeSwitch:BlindHoSwitch
CELLHOPARACFG
1
CsfbHoPolicyCfg
CSFALLBACKPOLICYCF G
REDIRECTION1&CCO_HO0&PS_HO-0
HoAlgoSwitch:UtranCsfbSwitch
ENODEBALGOSWITCH
1
LTE2600/1800 1. Redirect to LTE (fast return) 1. When RSCP >-103dBm redirection to U2100 F1/ U900 (INTERRATHIGHESTPRI = UTRAN)
2. Redirect to LTE (fast return)
UMTS F1 L2U CSFB
CsfbHoUtranB1ThdRscp
-103dBm CSFALLBACKHO
CsfbHoUtranTimeToTrig HoAlgoSwitch:GeranCsfbSwitch L2G CSFB
40ms ENODEBALGOSWITCH
CsfbHoGeranTimeToTrig
UMTS U900
3. Reselect to LTE
2. Blind redirection to GSM, if there are no B1 report from UMTS cell (InterRatSecondPri=GERAN)
1
GSM
40ms CSFALLBACKHO
CsfbHoGeranB1Thd
-95dBm
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LTE Parameter - Connected Mode Handover PS L2U: 1) UE will start to measure UMTS signal when: LTE signal < (InterRatHoA2ThdRSRP - InterRatHoA1A2Hyst) = -115 - 2*0.5 = -116dBm The signal condition need to maintain for InterRatHoA1A2TimeToTrig:640ms 2) UE will redirection to UMTS when: UMTS RSCP > (InterRatHoUtranB1ThdRscp-InterRatHoUtranB1Hyst) = -103+2*0.5 = -102dBm The signal condition need to maintain for InterRatHoUtranB1TimeToTrig :320ms
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LTE Parameter - Connected Mode Data Service(Configuration) L2600/1800: Neighbor cell RSRP greater than serving by 4dB
When RSRP >-111dBm, stop measuring IRAT & inter frequency When RSRP<-115dBm, start measuring UMTS & GSM& inter frequency When RSRP<-121dBm, starting the blind redirection.
LTE2600
When RSCP of UMTS >-102dBm, redirect to Utran
When RSRP of L1800 >-105dBm, hanodver to L1800
When Rxlev of GSM >-103dBm,redirect to GERAN
When UE in idle, Reselect to L2600 (RSCP > -108dBm)
LTE1800 When RSCP of UMTS > -102dBm, redirect to Utran
When Rxlev of GSM >-103dBm,redirect to GERAN
When UE in idle, Reselect to L2600 (RSCP > -108dBm)
When UE in idle, Reselect to L1800 (RSCP > 108dBm)
UMTS F1 When UE in idle, Reselect to L1800 (RSCP > -108dBm)
GSM
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LTE Parameter - Connected Mode Data Service(Configuration) Scenario
Parameter InterRatHoA1A2TrigQuan InterRatHoEventType
MML INTERRATHOCOMM
INTERRATHOA1A2HYST
L2U Common
INTERRATHOA1A2TIMETOTRIG INTERRATHOA1THDRSRP
RSRP EventB1
INTERRATHOCOMMG ROUP
640ms -111dBm -115dBm
BlindHoA1A2ThdRsrp
CELLHOPARACFG
-121dBm
HoModeSwitch:UtranRedirectSwitch
ENODEBALGOSWITCH
1
UtranPsHoSwitch
ENODEBALGOSWITCH
1
InterRATHoUtranB1MeasQuan
INTERRATHOCOMM
RSCP
INTERRATHOUTRANB1THDRSCP InterRatHoUtranB1Hyst INTERRATHOUTRANB1TIMETOTRIG
Remark
2
INTERRATHOA2THDRSRP
L2U Connect ed
Setting
PS Handover switch
-103dBm INTERRATHOUTRANG ROUP
2 320ms
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UMTS Side Requirement o Parameter setting Configure UMTS network priority as 3, Reselection from UMTS to LTE: (Priority based) UE will always measure LTE signal when camping on UMTS UE will reselect to LTE when:
U2L: LTE signal > -108dBm
o Feature Below list Huawei UMTS for reference, detail UMTS feature requirement depend on UMTS network vendor. Feature ID
Feature Name
Remark
WRFD-020126
Mobility Between UMTS and LTE Phase 1
UL interworking
WRFD-140226
Fast Return from UMTS to LTE
U2L fast return
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GSM Side Requirement o Reselection from GSM to LTE: (Priority based) Configure GSM network priority as 1, UE will always measure LTE signal when camping on GSM. UE will reselect to LTE when:
G2L: LTE signal > -108dBm
The signal conditions need to maintenance for 0
seconds.
o Feature Below list Huawei UMTS for reference, detail UMTS feature requirement depend on UMTS network vendor. Feature ID
Feature Name
Remark
GBFD-511301 GBFD-511312
Cell Reselection Between GSM and LTE Fast LTE Reselection at 2G CS Call Release
G2L reselection G2L fast return
GBFD-511313
CSFB
Support CSFB
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LTE Intra-Frequency Reselection and Handover LTE Intra Reselection NE
MML
eNodeB MOD CELLRESEL
LTE Parameter
Recommended value
Comments
SIntraSearchCfgInd
CFG
Configure
SIntraSearch
29
TReselEutran
1
1 second
LTE Parameter
Recommended value
Comments
IntraFreqHoA3Hyst
6
3db
IntraFreqHoA3Offset
2
1db
IntraFreqHoA3TimeToTrig
480ms
480ms
LTE Intra HO NE
MML
eNodeB ADD INTRAFREQHOGROUP
eNodeB MOD INTRARATHOCOMM
IntraFreqHoA3TrigQuan=RSRP;
eNodeB MOD ENODEBALGOSWITCH
IntraRatEventAnrSwitch-1&UtranEventAnrSwitch-1;
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LTE 1800 and LTE2600 Inter-working L2600-20M
L1800-10M
L1800-10M
L1800-10M
Network Information: 1. Frequency band：L1800 as coverage layer, L2600 as capacity layer. 2. Coverage：L1800 continue coverage, L2600 only cover hotspot. 3. Site status：L1800 and L2600 co-located, (L2600 not ready)
Network Strategy Idle Mode
LTE UE camp on L2600 on higher priority than L1800
Connected Mode
Enable L2600 -> L1800 coverage based HO
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Remark L1800 as coverage layer don’t HO to L2600
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LTE 1800 and LTE2600 Inter-working: Reselection LTE Parameter
MML
QRxLevMin
Setting
Remark
-64
-128dBm
QQualMin
-18
-18dB
QRxLevMin
-64
-128dBm
QQualMin
-18
-18dB
MOD CELLSEL
SNonIntraSearchCfgInd
CFG InterFreq/InterRAT use same
MOD CELLRESEL SNonIntraSearch
Start measurement,
9
QRxLevMin*2+SNonIntraSearch*2 =-128+18=-110dBm
CellReselPriority
Cell reselection priority(L18005/L2600-6)
5/6 0
QoffsetFreq CellReselPriority
Cell reselection priority(L18005/L2600-6)
5/6 MOD EUTRANINTERNFREQ
ThreshXHigh
11
ThreshXLow
11
-128+11*2=-106dBm
Reselection Priority：L2600 > L1800 HUAWEI TECHNOLOGIES CO., LTD.
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LTE 1800 and LTE2600 Inter-working: InterFreq Handover LTE Parameter
MML
Setting
InterFreqHoA2ThdRsrp
-109dBm
InterFreqHoA1A2Hyst
2 [0.5dB]
InterFreqHoA1A2TimeToTrig
Remark Start Inter-Freq measurement
320ms
MOD INTERFREQHOGROUP
InterFreqHoA1ThdRsrp
-105dBm
Stop Inter-Freq measurement
InterFreqHoA4ThdRsrp
-105dBm
Target signal
InterFreqHOA4Hyst
2（Unit:0.5dB）
InterFreqHoA4TimeToTrig
320ms
InterFreqHoEventType
EventA4 EUTRANINTERNFREQ
QoffsetFreqConn InterFreqHoA1A2TrigQuan
dB0 INTRARATHOCOMM
RSRP
One-way L2600 -> L1800（Coverage based）
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