View
4.838
Download
34
Category
Preview:
Citation preview
www.huawei.com
www.huawei.com
Inter Frequency Hand Over Optimization
Author/ Email: Ray Khastur
Version: V1.0 (20131121)
2
Overview
F1:20 MHz
F2:10 MHzF2:10 MHz
When UE located inside the Building UE will handle by 20 MHzUE will start A2 when serving cell became worst than thresholdUE will start A4 when neighbor better than threshold,
UE on 10 MHz when out side the Building
UE will start A3 when neighbor offset become better than
threshold,
InterFreq HO Success IntraFreq HO Success
Note : Please see in full screen mode for the simulation
Inter Frequency Handover Observation-1
4
Change Configuration A1
Triggering condition: Ms Hys > Thresh
Exiting condition: Ms + Hys < Thresh
A2
Triggering condition: Ms + Hys < Thresh
Exiting condition: Ms Hys > Thresh
A4
Triggering condition: Mn + Ofn + Ocn Hys > Thresh
Exiting condition: Mn + Ofn + Ocn + Hys < Thresh A1 & A2
Ms = Measurement Serving
Hys = Hysteresis A1A2
Thresh = A1 or A2 RSRP Threshold
A4
Mn = Measurement Neighbor
Ofn = Frequency-specific offset for Neighbor
Ocn = Cell-specific offset for Neighbor
Hys = Interfreq HO Hysteresis
Thresh = A4 RSRP Threshold
5
Default Configuration (10MHz to 20MHz)
1) When UE serving from 10
MHz with default threshold
Threshold A1 : -105
Threshold A2 : -109
Our UE will not doing any
measurement due to 10 MHz
RSRP still higher than A1
Threshold
2) We need to mapping in which
level RSRP we can start to
search other frequency.
3) A1 threshold change to
(-90dBm) and A1A2 hys
change to 2 dBm.
A1 (interfreq stop
measurement) will happen
when RSRP Ms-2>-90
Ms>-88
4) Change A2 Threshold to (-93
dBm). A2 (start interfreq
measurement report to eNB)
will happen when RSRP
Ms+2
6
Default Configuration (20MHz to 10MHz)
When UE serving from 20 MHz
with default threshold Interfreq
HO can happen smoothly
Threshold A1 : -105
Threshold A2 : -109
7
Event A2 Monitored (10MHz to 20MHz)
When UE serving from 10 MHz
UE measurement @ -97 dBm
Threshold A2 : -93
-97+2 < -93 event A2 trigger
RSRP = -105 dBm
8
Default Configuration (10MHz to 20MHz)
5) In another Band (20 MHz) the
signal strength -94 dBm.
Threshold A4 was set to -97
dBm. Hys = 2
Mn+Ocn+Ofn-Hys > Thresh
Mn+0+0-2 > -97
Mn > -95 dBm
Event A4 will happen
9
Event A4 Monitored
When UE serving from 10 MHz
UE measurement @ -92 dBm
Threshold A4 : -97
-92+0+0-2 > -97 event A4 trigger
happen
RSRPn = -92 dBm
RSRPs = -95 dBm
10
Test Result after modification
Test Result show interfreq HO can run smoothly
11
Test Result after modification
Test Result show interfreq HO can run smoothly
12
Test Result after modification
Test Result show interfreq HO can run smoothly
Inter Frequency Handover Observation-2
14
From Last Configuration The Test taken from Outside to Inside
via back lobby.
When UE move from Outside to Inside via front lobby, we need
to adjust
A1 = -67 dBm
A2 = -69 dBm
Proposed to Modification
A1
A2
1) Event A1 will happen when
Ms-2>-67
Ms>-65
2) Event A2 wil happen when
Ms+2
15
From Last Configuration The Test taken from Outside to Inside
via back lobby.
When UE move from Outside to Inside via front lobby, we need
to adjust
A4 = -113
Proposed to Modification
A4
3) Event A4 will happen when
Mn-Ofn-Ocn+Hys > -113
Mn > -115 dBm
16
Interfreq HO from 10M to 20M Front Gateway
17
Interfreq HO from 10M to 20M Front Gateway
18
Interfreq HO from 10M to 20M Back Gateway
19
Interfreq HO from 10M to 20M Back Gateway
Recommended