LTE HO Strategy. Features. KPIs

1.

LTE HO Strategy
Features
KPIs
Yossi Verona
1

2.

LTE HO Strategy
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2

3.

LTE Idle Mode Camping
▪
Two main parameters for camping:
✓
✓
qRxLevMin (RSRP) = -140dBm
qQualMin (RSRQ) = -33dB
RSRP = -140dBm
RSRQ = -33dB
LTE
f1/f2/f3
BTS
Yossi Verona
f1/f2/f3
BTS
3

4.

Cell Selection/Reselection and PLMN Selection
Yossi Verona
4

5.

Intra LTE HO – Interfaces Involved In Intra-LTE HO
▪
Three types of Intra-LTE HO:
✓
✓
✓
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Intra-RBS
X2 Inter-RBS
S1 Inter-RBS
5

6.

Intra LTE HO – Interfaces Involved In Intra-LTE HO
▪
No need to define Intra frequency neighbors:
✓
By default, UE in the LTE network detects suitable neighbor cells, without the
assistance of a list of neighbor cells sent by the serving RBS.
= Both
= RSRP
=3dB
=0
=1dB
=480ms
=40ms
=0
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6

7.

Intra LTE HO Related Features
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7

8.

Inter RAT LTE Mobility To WCDMA Concept
▪
In order to allow LTE to WCDMA mobility the following feature
should be activated in the eNB:
✓
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Coverage-Triggered WCDMA Session Continuity
8

9.

Inter RAT LTE Cell Reselection To WCDMA – Idle Mode
▪
▪
▪
▪
By activating the feature “Coverage-Triggered WCDMA Session Continuity” the
creation and transmission of SIB6 in the eNB is enabled.
SIB6 contains information and parameters required by the UE to
perform idle mode reselection to the WCDMA network.
No need to define specific WCDMA cells Neighbor List.
The following information is provided in SIB6:
✓
✓
✓
✓
✓
✓
✓
arfcnValueUtranDl
cellReselectionPriority
threshXHigh
threshXLow
tReselectionUtra
tReselectionUtraSfMedium
tReselectionUtraSfHigh
SIB6
LTE
f1/f2/f3
BTS
Yossi Verona
f1/f2/f3
BTS
9

10.

Inter RAT LTE Session Continuity To WCDMA – Conn. Mode
▪
Poor coverage evaluation process using primary threshold:
= Both
= RSRP
=1dB
=-120dBm
=-20dB
=480ms
=640ms
=0
Yossi Verona
10

11.

Inter RAT LTE Session Continuity To WCDMA – Conn. Mode
▪
Poor coverage evaluation process using primary threshold:
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11

12.

Inter RAT LTE Session Continuity To WCDMA – Conn. Mode
▪
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Poor coverage UE handling
12

13.

WCDMA To LTE Cell Reselection – Idle Mode
▪
In order to allow WCDMA to LTE cell reselection (idle mode) the
following feature should be activated in the RNC:
✓
▪
▪
▪
▪
▪
LTE Cell Reselection (FAJ 121 1474) - ‘eutran detection’, EutranFreqRelation
MO parameters.
By activating the feature creation and transmission of SIB19 in the
WCDMA nodeB is enabled.
SIB19 contains information and parameters required by the UE to
perform idle mode reselection to the LTE network.
No need to define specific LTE cells Neighbor List and no need to
reconsider WCDMA already existing neighbors.
Cell reselection to LTE is supported by E-UTRA capable UEs in Idle
Mode and in URA_PCH.
The following information is provided in SIB19:
✓
✓
✓
LTE DL EARFCN (Max 8)
cellReselectionPriority
More…
LTE
f1/f2/f3
Yossi Verona
BTS
f1/f2/f3
BTS
13

14.

SIBs Scheduling Change to Contain SIB19
Recommended to
be changed
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14

15.

WCDMA To LTE Release With Re-Direct – Connected Mode
▪
In order to allow WCDMA to LTE release with redirection in connected
mode, the following feature should be activated in the RNC:
✓
▪
▪
▪
▪
Release with Redirect to LTE (FAJ 121 2174) – ’releaseRedirect’ Parameter.
Release with Redirect to LTE (FAJ 121 2174) is a complement to LTE
Cell Reselection.
It ensures mobility to LTE for an active UE that spends little time in
Idle Mode or in state URA_PCH where LTE Cell Reselection can be
performed.
It is a blind redirection, fast and without compressed mode.
There is no pre-allocation of resources in the target LTE system.
Release with Redirect to LTE is not supported when the best cell is
located in DRNC.
LTE
f1/f2/f3
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BTS
If UE State:
• Idle
• Ura (FD)
• Then - > ‘RRC Connection
Release with redirection
information (e-Utra Freq)
f1/f2/f3
BTS
15

16.

Features
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16

17.

KPIs
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17

18.

LTE Initial Selected KPIs
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18

19.

Yossef Verona
19

20.

LTE DL Resource Grid With 5M BW
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20

21.

Yossi Verona
21