handover ii algorithm

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Handover II algorithm

Huawei Egypt RNO

HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential

Handover II algorithm

•Handover II Process difference

•Handover II algorithm optimization


Content

1 Handover II summarization

2 Handover II algorithm flow

3 Algorithm optimization



Handover II sorting

Handover algorithm flow


1.1 Handover II sorting

Handover type Handover algorithm

Emergency handover

Quick handover (High speed railway)

TA handover

BQ handover

Edge handover

Normal handover

Intra cell handover

Interference handover

Concentric handover

F-H&H-F

Tight BCCH handover

Inter cell handover

Enhanced dual band

Better cell handover

Load handover (in 11th bit)

MS fast moving handover (Micro-

Macro)

3G Better cell handover


1.2 Handover I algorithm flow

Processing of MR

Penalty processing: cut down the priority of the

penalty cell.

Basic rank

Network feature adjustment(16bit)

HO decision

Emergency HO: TA HO

Emergency HO: BQ HO

Emergency HO: Rx_Level_Drop HO

Emergency HO: Interference HO

Load HO

Normal HO: edge HO

Normal HO: Layer HO

Normal HO: PBGT HO

3G better cell handover

Forced HO (direct retry, Manual)

IUO HO

Fast Moving HO (Micro-Macro)

Quick handover (High railway)

Enhanced dual band HO

AMR HO

Tight BCCH HO

Emergency HO: No DL MR handover


1.3 Handover II algorithm flow


Content






MR processing

Penalty

Ranking

Handover judgment flow optimization


2.1 Handover II MR processing

MR Interpolation MR Interpolation

Select the protocol worst value(-110dBm) to interpolate (remark)

Serving cell MR power control compensation Serving cell MR power control compensation

For all the inter cell handover, the serving cell MR will be compensated. (remark)

For the intra cell handover (except concentric handover), serving cell MR will not be

compensated.


New added penaltyNew added penalty

2.2 Handover II penalty

1. After load handover, punish the initial cell

level from [penalty level on load HO] during

[Penalty time on load HO]

2. Add [Penalty Time on Interfere HO] after

interference HO (No matter success or failure)


2.3 Basic Cell Ranking and Network Feature Adjustment

Cell basic ranking

M Criterion

K Rank

Network feature adjustment

16 bits

In handover II, the Basic cell ranking and network feature adjustment is

divided. After the Basic cell ranking(bit1~bit4), the emergency handover

will trigger, then the network feature adjustment(bit5~bit16) will start.

Finally, the Forced handover and normal handover will triggered based on

the network feature adjustment result.

Note: the emergency handover just consider the level, so after basic

ranking, it will trigger.


2.4 Handover Judgment flow optimization

The handover II consider all the handover type judgment result.

According to the integrated ranking result to decide the target cell.

According to the target cell define the handover reason

Emergency handover add the P/N judgment.


Cell0 Cell1 Cell2 Cell3 Cel4 Cell5

Cell0

TA

Cell1

TA

Cell2 Cell3 Cel4 Cell5

Cell2 Cell3 Cell0

TA

Cell1

TA

Cel4 Cell5

Cell2

BC

Cell3 Cell0

TA 、 BC

Cell1

TA

Cel4 Cell5

After level ranking (Bit1~Bit4):

After Emergency handover judgment:

After network feature adjustment (Bit5~Bit16):

After Normal handover judgment:

Cell0

TA

Cell1

TA

Cell2

BC

Final result:

Case:


Content





The 11th bit optimization adjustment (Remark)

Load handover Margin change ：

“A” maximum is [Load HO bandwidth], suggest [Load HO bandwidth] is 2* K_Hyst

“Period” is [Load HO Step Period], “Step” is [Load HO step Level]

The 11th bit adjustment change:

If the candidate neighbor cell suffice the load margin, then:

* Serving cell 11 bit

Suffice the following condition set 0, or else set 1

* Neighbor cell 11 bit

Suffice the following condition set 0, or else set 1

SS_DLi_f – SS_DLs_f <= K_Hyst i SS_DLi_f – SS_DLs_f > K_Hyst i – A

1T

A StepPeriod

_s s lL T

_i i lL T


The 14th bit optimization adjustment (Remark)Serving cell ： Suffice the following condition is set “0”,or else is set to “1” ：

Neighbor cell ：

1 ） If Neighbor cell is in the same layer as serving cell: (No need same priorit

y)

A 、 When serving cell 14bit is set to 0, if neighbor cell suffice the following con

dition, it is set to “0” , or else is set to “1” ：

B 、 When serving cell 14bit is set to 1, if neighbor cell suffice the following co

ndition, it is set to “0” , or else it is set to “1” ：

“Hi” is inter-cell handover hysteresis

2 ） If Neighbor cell is in the different layer from serving cell:

if neighbor cell suffice the following condition, it is set to “0” ,or else it is set to “1”

__ s f layer layerSS DL T H

SSi_f >= Tlayer - (Hlayer - 64)

SSi_f >= Tlayer - ( Hlayer - 64 ) + Hi

SSi_f >= Tlayer + ( Hlayer – 64 )


BQ handover

Candidate cell condition change (remark)

Neighbor P/N

Delete serving cell from candidate list, no intra cell HO.

Load handover

The load handover is triggered from better cell handover, the independent load handover

algorithm is deleted.

Suffice better cell handover cause and load handover cause, the load handover can be

triggered.

After load handover, punish the initial cell level from [penalty level on load HO] during

[Penalty time on load HO]


Interference handover

Intra cell handover switch should be open.

Add [Penalty Time on Interfere HO]

Triggering condition and target choice (remark)

MS fast moving handover (Micro-Macro)

The candidate Macro cell is not only 1 in handover II

candidate list.

EDGE handover

EDGE handover is sorted in emergency handover


Level rapid Drop handover

It is deleted from handover IIDirect retry judgment condition optimization

Delete the neighbor judgment condition [Directed Retry Load Access Threshold] and [Min Power Level For Direct Try]

The [Min Power Level For Direct Try] effect is replaced by the judgment::

Neighbor BCCH DL level after filter > serving cell DL level after filter + Inter cell HO hysteresis – (Direct retry HO

level range - 64)

The [Directed Retry Load Access Threshold] effect is replaced by the 11 bits. That means the Direct retry and load

handover conception is integrated.

Note: Suggest the Direct retry and load handover are enabled together.

Concentric handover

Both Intra cell handover and concentric handover switch are open.

The load handover from underlaid to another cell


F-H&H-F (remark)

AMRF-AMRH

AMRH-AMRF

FR-HR

HR-FR

Better cell handover

Delete the co layer co priority limitation

The neighbor cell use neighbor P/N judgment

We can choose the pass loss mode for better cell handover (Pathlo

ss Ho. Enable)

Inter Layer handover

It is deleted

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handover ii algorithm

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