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HandoverBy Mina Adly

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HANDOVER .

M.Adly

Why we need HO

What are the types of HO What is Soft HO

..

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Handover types

We can classify HO in many ways below is examples

Based on technology we have Inter RAT and Intra RAT

Based on frequency we have Inter Frequency and Intra Freq

Based on sites we have sites we have intra site and inter site

Based on connection and process we have soft softer and h

Too many too connected but too simple

For us we will use the general classification InterRat, InterFreq

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Intra Frequency HO

Intra frequency is the most common type, it is soft HO (or som

within the same site or with different sites and for sure is Intra R

The whole process is controlled through the events reported b

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Intra Frequency HO

Triggering of Event 1A

Parameters to control:

IntraRelThdFor1ACSNVP

IntraRelThdFor1ACSVP

IntraRelThdFor1APS

CIO (cell level)

CIOOffset (relation level)

HystFor1A

TrigTime1A

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Intra Frequency HO

Triggering of Event 1B


IntraRelThdFor1BCSNVP

IntraRelThdFor1BCSVP

IntraRelThdFor1BPS

CIO (cell level)


HystFor1B

TrigTime1B

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Intra Frequency HO

Triggering of Event 1C


CIO (cell level)


HystFor1C

TrigTime1C

MaxCellInActiveSet

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Intra Frequency HO

Triggering of Event 1D


CIO (cell level)


HystFor1D

TrigTime1D

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Inter Frequency or Inter Rat HO

They are the second type of handover, in this case they are h

can happen due to the below reasons

1. Coverage based

2. QOS (in case of degraded quality scenario quality of service triggered)

3. LDR

4. Service HO

5. HCS HO

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But in order for all of this to start first we need to introduce whCompressed mode

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2D triggering 2F triggering

Inte

rFreq

InterFreqCSThd2DEcN0 InterFreqCSThd2FEcN0

InterFreqR99PsThd2DEcN0 InterFreqCSThd2FRSCP

InterFreqHThd2DEcN0 InterFreqR99PsThd2FEcN0

InterFreqCSThd2DRSCP

InterFreqR99PsThd2FRSCP

InterFreqR99PsThd2DRSCP InterFreqHThd2FEcN0

InterFreqHThd2DRSCP InterFreqHThd2FRSCP

InterRat

InterRATCSThd2DEcN0 InterRATCSThd2FEcN0

InterRATR99PsThd2DEcN0 InterRATR99PsThd2FEcN0

InterRATHThd2DEcN0 InterRATHThd2FEcN0

InterRATCSThd2DRSCP InterRATCSThd2FRSCP

InterRATR99PsThd2DRSCP InterRATR99PsThd2FRSCP

InterRATHThd2DRSCP InterRATHThd2FRSCP

TimeToTrig2D TimeToTrig2F

HystFor2D HystFor2F

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Coverage or QoS Handover Measurement Report Modes

The coverage-based and QoS-based handover use event-triggered or perioreport mode.

InterFreqReportMode: The measurement report mode of inter-frequency han

InterRatReportMode: The measurement report mode of inter-RAT handover.

PrdReportInterval: The periodical measurement report interval of inter-freque

InterRATPeriodReportInterval: The periodical measurement report interval of i

The advantage of periodical measurement report is that if the handover failsreattempts the handover to the same cell after receiving the periodical meafrom the UE. This increases the probability of the success of inter-frequency ha

Based on the measurement control message received from the RNC, the UE the measurement quality of the target cell. Then, based on the measuremenmakes the handover decision and performs handover

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Inter Frequency or Inter Rat HO Inter freq HO decision

After receiving the periodical measurement report of the inter-frequency cell, the target cells based on the below equation

Mother_Freq + CIOother_Freq Tother_Freq + H/2

Where Tother is defined as in the below parameters as per the MeasQuantity settin

TargetFreqCsThdEcN0

TargetFreqCsThdRscp

TargetFreqR99PsThdEcN0

TargetFreqR99PsThdRscp

TargetFreqHThdEcN0

TargetFreqHThdRscp

And the H is the HystForPrdInterFreq, considering the time to trigger criteria definedTimeToTrigForPrdInterFreq.

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Inter-Frequency LDR Handover Inter freq HO decision

One of the LDR actions is the interfreq HO, which can be done ethe measurements or based on Blind HO which works as in below

1. For LDR interFreq Blind HO:

If LDR is triggered then the UE will perform inter frequency HOblindly with no measuring to the target cell, for this to work theparameters in the relation level definition should be enabled

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ADD UINTERFREQNCELL

BlindHoFlag turn on the blind HO

BlindHOQualityConditionRSCP threshold on the source cHO

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Inter-Frequency LDR Handover Inter freq HO decision

One of the LDR actions is the interfreq HO, which can be done ethe measurements or based on Blind HO which works as in below

2. For LDR interFreq measured based HO:

The RNC selects the target cell based on the measurement reperiod is specified by the parameter PrdReportInterval.

The target cell must meet the following conditions:

1. The CPICH RSCP value of the target cell is larger than TargetF

2. The CPICH Ec/No value of the target cell is larger than Target

3. The target cell is not in the basic congestion state.

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Inter-RAT LDR Handover InterRat Ho is also one of the actions of LDR, it only works thro

triggering process in which 3C event need to be reported, it c

reported if the below equation is validMOtherRAT + CIOOtherRAT TOtherRAT + H3c/2

TotherRAT is InterRATNCovHOCSThd OR InterRATNCovHOPSTh

H3c is HYSTFOR3C

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Inter-RAT service HO To perform the service-based 3G-to-2G handover, the RNC m

related switches for services in the CS and PS domains.

When a single CS service is initially set up by the UE, the RNC to-2G service-based handover if CSServiceHOSwitch is set to

When a single PS service is initially set up by the UE, the RNC aservice-based 3G-to-2G handover if PSServiceHOSwitch is set

For the combined services, no service-based handover is trig

For target selection and execution same as the LDR interrat H

M.Adly

03HO

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