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

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Interfreq HO from 10M to 20M Back Gateway