AN INVESTIGATION ON MOBILITY

MANAGEMENT IN LTE-A INTER-HENB;

NETWORK OF FEMTOCELLS.

UNIVERSITY OF JYVÄSKYLÄ,

DEPARTMENT OF MATHEMATICAL INFORMATION TECHNOLOGY.

03 December 2013

Abouck Opu Narcisse, Student: Mobile Technology,

Thesis Presentation.

Prof. Timo Hämäläinen, Thesis Supervisor.

PRESENTATION - OUTLINE

Background

Long Term Evolution Advanced

Femtocell

Mobility Management – Handover

Research Questions and Methodology

Research Related research conducted

Inter HeNB handover

Simulation with ns3

Network of Femtocells

Further Research

References

KEYWORDS

Handover – HO

Long Term Evolution Advanced – LTE-A

Network of Femtocells – NoFs

Discrete Network simulator 3 – ns3

Evolved Node B - eNB

Home eNB - HeNB

Third Generation Partnership Project - 3GPP

Mobile Network Operator – MNO

Self optimizing Network – SON

Mobility Management – MM

RSRP – received signal power

RSRQ – receive signal quality

FEMTOCELL - HENB

Small base station

Low transmission

power & capacity

2 – 6 users

SON properties

Good RSRP & RSRQ

RAN in E-UTRAN

femtocells in E-UTRAN architecture (3GPP)

Femtocells architecture (Lan et ., 2009)

PURPOSE OF RESEARCH

HeNB, better data rates

UE moving into HeNB for better data rates

UE moving for better QoS of calls

MNO spend less on operations

60% of mobile data originates from HeNB

MM and HO become important in Femtocells

No standardized solution for HO in Femtocells

eNB -> HeNB is very slow

3GPP specification – traffic offload

RESEARCH PROBLEMS

How is HO from HeNB -> HeNB completed

autonomously without signalling leaving for the

Femtocell?

How can a HO from HeNB -> HeNB which is

connected to another NoFs be completed without

the involving the MME and S-GW?

Is the HO algorithm for inter-HeNB efficient

enough to enhance mobility?

RESEARCH METHODOLOGY

Constructive Research Methodology is employed

Commonly used in computer science research

Employs systematic five stages and check at

arrive at goal:

1. Practical problem – inter-HeNB HO lack

2. Understanding Research Problem – related work

3. Improved \ Novel solution – inter-HeNB HO

improvements

4. Demonstrate solution – ns3 simulation

5. Applicability – confirm to 3GPP specs

RELATED WORK 1

Lan, Yongsheng & Zhenrong (2009) “Mobility

Management Schemes at Radio Network Layer for LTE

Femtocells”

Proposed solutions for HeNB HO

Introduce the HeNB gateway to control HeNB

Their first proposal used HeNB GW to restrict

HeNB traffic

Their second proposal did not limit traffic nor

aligned with 3GPP specs.

RELATED WORK 2

Kwak, Lee, Kim, Saxena & Shin (2008).

“Mobility Management Survey for Home-eNB Based

3GPP LTE Systems”.

They explained factors affecting HeNB HO

They identified RSSI as main determinant

Load balancing

Lack of Automatic Neighbour Relation (ANR)

Lack X2 interface in HeNB

UE mobility speed

RELATED WORK 3

Haijun, Wenmin, Wei, Wei, Xiangming &

Chunxiao (2011), “Signalling Cost Evaluation of

Handover Management Schemes in LTE-Advanced

Femtocell”

Proposed algorithm for HO based on mobility

HO at low mobility for better QoS

Time to stay was also considered

HO discourage at high mobility

Assumed cells had clear boundaries

Considered only mobility for HO

RELATED WORK 3-B

Old – HO increased with

high mobility

More HO and less data

transferred

New – less Ho at high

mobility

No HO at very high

mobility.

signalling overhead versus high speed user proportion (Haijun,

Wenmin, Wei, Wei, Xiangming & Chunxiao, 2011)

HO ENB – HENB

eNB -> HeNB HO sequence (Lan, Yongsheng & Zhenrong, 2009)

SIMULATION – NS3

LTE module - No support for HeNB HO

Scenario – HO eNB – HeNB in densely deployed

HeNB in eNB coverage

NS3 HO parameters

Parameters Values Descriptions --nBlocks 6 Number of femtocell blocks (HeNB) --nFloors 1 Number of floors in building --nMacroEnbSites 7 Number of eNodeB --interSiteDistance 500 m Distance between eNodeB --macroUeDensity 0.0001 Density in eNodeB m --useUdp 0 UDP protocol not used --homeEnbDeploymentRatio 0.2 HeNB Deployed ratio in macro --homeEnbActivationRatio 0.5 HeNB active radio in macro --simTime 30 s Duration of simulation --epc 1 --macroEnbTxPowerDbm 46 dBm Transmission power of eNodeB --homeEnbTxPowerDbm 20 dBm Transmission power of HeNB --homeUesHomeEnbRatio 1 Average UE per HeNB --macroEnbBandwidth 25 MHz Bandwidth of eNodeB --homeEnbBandwidth 25 MHz Bandwidth of HeNB

RADIO ENVIRONMENT MAP

eNBs with 3 cells each before HO trigger

HeNB – Green

Building - Yellow

UE - White

TRIGGER HO

4 UE used

1 successful HO

RADIO ENVIRONMENT MAP

After HO trigger

1 HeNB; green arrow

DATA RATES

Before and after HO

NETWORK OF FEMTOCELLS (NOFS)

BeFEMTO Project

LFGW

Local IP Access (LIPA)

Select IP Traffic

Offload (SIPTO)

Peer-peer routing

S-rat Interface

BeFEMTO EPS architecture (Jaime, Josep, Jose &

Frank, 2012).

HO IN NOFS

Proxy MME

Proxy S-GW

Signal offloaded

HO delays

HeNB -> HeNB HO sequence, BeFEMTO

LIMITATIONS & FURTHER RESEARCH

Inter-HeNB HO

Manually trigged

Few HeNBs, UEs &

eNBs.

Calls quality

Many UEs, eNBs &

HeNBs

Dynamic triggers

Radio readings

HeNB – eNB HO

Limitations Further Research

QUESTIONS, PLEASE

Thanks you for

listening

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