Self Configuring Networks: Flexible Spectrum Sharing for

Home Base Stationin

Next Generation Mobile Telecommunication Systems

Soumen Mitra (SRF)Prabhu Chandhar (RS)

Dr. Suvra Sekhar Das (PI)

G. S. Sanyal School of TelecommunicationsIIT Kharagpur

• Project Status

• Project Objectives

• Work done after Q6 review

• Overall work progress and future plan

4/21/2011 2GSSST, IIT Kharagpur

Agenda

Project Status

• Date of Inception: 01/04/2009

• Researcher’s involved:

– Tuhin Subhra Chakraborty• Sep’ 2009 to Nov’ 2009 : As RC

– Prabhu Chandhar• Jan’ 2010 to – Jul’ 2010 : As SRF

– Soumen Mitra• 26th Oct 2010 – till date : As SRF

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Objectives

Initial Objective: (as mentioned in the project proposal)

• To provide guidelines for HeNB (Femtocell) Deployment

• To develop methods for self-organized network deployment

Current focus:• Preparation of algorithms and procedure for deployment of

HeNB (inline with the 1st objective)– Self Organization– Development of Multi-Objective Optimization Framework

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Internet

PDN-GW

MME

BBRouter

BBRouter

BBRouter

HeNB GW

S-GW

Media GW

EPC

Internet

PDN-GW

MME

BBRouter

BBRouter

BBRouter

HeNB GW Media

GW

EPC

HeNB

Enterprise HeNB

UEs attached to HeNB

MeNB

UEs attached to MeNB

MME S-GW

How it fits into big picture ?• Advantages for Operator in Deployment of Femtocells (HeNB)

– Area Spectral Efficiency & Coverage Improvement– Traffic Offload to HeNB

• Beat Wifi Competition• Same hardware & AI

• Challenges– Interference

• Femtocell Macrocell• Macrocell Femtocell• Femtocell Femtocell

– Deployment Methods

• Probable Approaches– Self Configuration

• Auto–Configuration of Radio Parameters

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HeNB deployment Objectives

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• Objective 1:

– Maximize: [ Σ Thptmacrocell + Σ Thptfemtocell ](bps)• Objective 2:

– Maximize: No of Active Femtocell– Minimize: Interference …..

• Controllable Parameters• Femtocell parameter adjustment (Degrees of Freedom)

• Macrocell Condition (Given / Changeable )

Femto-Power Femto-Load# Active

Femtocell

Macro-Load # Macro-user

Any other inputs from Vodafone ?

Femtocell Network Control Methods

• Centralized Control Methods– HeNB–MeNB co-ordination

• Hybrid Control Methods– Distributed + Centralized

4/21/2011 7GSSST, IIT Kharagpur

Suitable solution for commercialization of

femtocell was requested in Q6

• Distributed Control Methods– Only HeNB–HUE co-ordination– No MeNB co-ordination

Internet

BBRouter

BBRouter

BBRouter

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Distributed Control Methods

Presented in Q6

Internet

PDN-GW

MME

BBRouter

BBRouter

BBRouter

S-GW

EPC

Internet

MME

BBRouter

BBRouter

BBRouter

HeNB GW

EPC

HeNB

Enterprise HeNB

UEs attached to HeNB

MeNB

UEs attached to MeNB

MME S-GW

HeNBMgmt

System

MeNBMgmt

System

Centralized Control Methods

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Internet

PDN-GW

MME

BBRouter

BBRouter

BBRouter

S-GW

EPC

Internet

MME

BBRouter

BBRouter

BBRouter

HeNB GW

EPC

HeNB

Enterprise HeNB

UEs attached to HeNB

MeNB

UEs attached to MeNB

MME S-GW

HeNBMgmt

System

MeNBMgmt

System

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Hybrid Control Methods

Simulation Parameters

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Results

Maximize: ΣSystem Capacity

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Total System Capacity Evaluation

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Maximum Achievable Mean System Throughput for various Macrocell conditions

Maximum 613 Mbps system throughput

achievable

Offload Traffic

Results

Maximize: No of active femtocell

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Evaluation of allowable no of femtocell

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Maximum Allowable Femtocells for various Macrocell conditions

Comparison of the two objectives

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Objective 1:Maximizing total

mean system throughput

Objective 2: Maximizing number

of active femtocell

Number of Active Femtocell

10 25

Total mean system throughput (Mbps)

211.27 184.22

Macro-load = 25% and No of Macro-user = 40

150% increase in objective 2

12.8% decrease in objective 1

Improvement with Hybrid Control

• With Hybrid control, individual femto-load is adjusted (10%) if the corresponding femtocell mean throughput is ≥ 5Mbps.

• For macro-load = 100% & macro-user = 85, there is 19% improvement in the 5% macrocell throughput with Hybrid control.

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Key Achievements

• Guidelines for femtocell deployment with the objectives:– Maximizing total mean system throughput– Maximizing number of active femtocells

• Femtocell radio parameters adjustment through:– Methods of distributed control– Methods of centralized control – Methods of hybrid control

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Potential impact of the results

• Feasibility of deployment of femtocell in 4G network

• Femto Deployment Analysis Framework– Maximize: Total system throughput– Maximize: No of active femtocell

• Femtocell Deployment Guidelines– Transmit Power limit of Femtocell: 2dBm to 5dBm– Need for Coordination between Macro/Micro and Femto Cell layers– Load Adaptation in Macro & Femto Cell

• Possible IPR– Control Architecture for successful femtocell deployment– Signaling methods for coordination

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For Deploying Agency

Operators

Industry Alignment of the work

Use of System Model specified by ITU [ITU M-2135] , 3GPP LTE-A– Cellular layout– Propagation environment – Transmission Technology

INDUSTRY ( Operators and Equipment Manufacturers)• Guidelines for deployment of femtocells 3GPP – LTE Release 8/10 networks

– Network capacity maximization– Network optimization

• Enhancement of the standards are per requirement of operators

Govt. of India through proper representation– Policy Making

TCOE (India , VEICET)

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Key Issues

• Proposal for Data collection :– Call Statistics– Propagation conditions– Energy Consumption

• Meeting held with Vodafone Kolkata – 2 times

• Unable to start activity– Vodafone Personnel engaged with 3G deployment

– NEED RE-SOLUTION

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Any other inputs from Vodafone ?

21 April 2011

SINR & Capacity Analysis

Downlink

Uplink

Enterprise femtocellsCapacity improvement

Self configuration &optimization

Solution for Hand Over issues

MIMO processing

Distributed Control

Centralized Control

Hybrid Control

Creating Model for Capacity Analysis

Signalling issues

Idle state

Active state

Done

Ongoing

To Be Done

Status-Last Review

Jan 2010 - May 2010

Jan 2011

Jul 2010 - Mar 2011

GSSST, IIT Kharagpur

Adaptive power control

RRM Techniques

21 April 2011

SINR & Capacity Analysis

Downlink

Uplink

Enterprise femtocellsCapacity improvement

Self configuration &optimization

Solution for Hand Over issues

MIMO processing

Distributed Control

Centralized Control

Hybrid Control

Creating Model for Capacity Analysis

Signalling issues

Idle state

Active state

Done

Ongoing

To Be Done

Current Status

Jan 2010 - May 2010

Jan 2011

GSSST, IIT Kharagpur

Adaptive power control

Multi-objective optimization framework

RRM TechniquesJul 2010 - Mar 2011

Adaptive Power Control for 3G

In 4G, adaptive power control is done based on target SINR value as follows:Target SINR (γ) = [RSRPdesired/(RSSI - RSRPdesired)]

RSSI: Received Signal Strength Indicator = Total Wide Band Power (Signal + Interference + Noise Power)

RSRPdesired: Desired Reference Signal Received Power

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Application of solution to 3G femtocell was requested in Q6

APC Parameters

• 4G parameters– RSSI (Received Signal Strength Indicator): E-UTRA carrier RSSI– RSRP (Reference Signal Received Power)

• Equivalent 3G parameters– RSSI (Received Signal Strength Indicator) : UTRA carrier RSSI– RSCP (Reference Signal Code Power): CPICH RSCP

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Conclusion

Distributed power control was presented in previous meeting

Centralized and Hybrid control Architecture and methods for HeNB are presented.

Deployment guidelines for HeNB for:

1. Maximization of total system capacity

2. Maximization of allowable no of HeNB

Parameter Mapping for 3G identified

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Status of the work: Future plan

Work Item Estimated TimelineMulti-objective optimization framework for

HeNB deploymentMay’11 – Dec’11

Uplink Analysis Jan’12 – Aug’12MIMO femtocells Sep’12 – Mar’13

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Future Work & proposed timeline:

Other Work Items:

Work Item if possibleCoordinated Scheduling for HeNB deployment

Solution for signaling issuesSolution of Hand over issues

THANK YOU