Self-organizing and Self-healing Mechanismsin Cooperative Small-cell Networks

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Eunmi Chu, Inkyu Bang, and Seong Hwan Kim

{emchu, ikbang, shkim}@cnr.kaist.ac.kr

Advisor : Prof. Dan Keun Sung

Sep. 9, 2013

Communication Networks Research Lab.

Department of Electrical Engineering

College of Information Science & Technology, KAIST

Background

What is future communication system ?

Objective : High speed data rate + seamless service

Solution : Transition to small cells + Self-Organizing & Self-healing network

Issues of small cells environments

Objective : Inter-cell interference Enhance Capcity

Solution : radio resource management , Cooperative clusters

Antenna technology issues of small cells

Communication Networks Research Lab.Communication Networks Research Lab.

Antenna technology issues of small cells

Omni-directional antenna Fixed switched beam antenna Adaptive beam

antenna

Future communication network

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Self-healingSmall Cells

Advanced Antenna

High Interference

ClusterCooperation

Complex Management

Organic Topology Network

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Environment densely deploying small cells + self-healing network + cooperative clusters among small cells

Component : Organic Topology Manger (OTM), DNs , ANs

OTM : Mgt. of cooperative cluster (Physical cluster, Logical cluster)

physical cluster based on location of small cells

Logical cluster to increase SINR while users sending or receiving

DN : antenna part with 2-layer function

AN : 3 layer function-Resource Mgt., routing

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System Model - Structure of Cooperative DNs

Femto Cells vs Proposed DNs in Normal Condition

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System Model - Types of Cooperative Clusters

Type of Cooperative Clusters

Physical cluster : maximum cooperative cluster

Logical cluster : clusters for sending and Receiving

Ex ) What is physical cluster and logical cluster of user k in DN n ?

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System Model - 3-step Self-healing Process

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System Model - 2 Schemes in Fault Condition

When Fault DN occurs,

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Simulation Model

Reference Model(a) fault (b) recovery

Proposed Model(c) fault (d) scheme-I(e) scheme-II

Reference Model

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System parameters

Proposed Model

Numerical Results

Subchannel efficiency

At normal and fault situation At recovery situation

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Conclusions

Self-Organizing Network

Components : Distributed Node, Anchor Node, Organic Topology Manger

Cluster Types : Physical Cluster, Logical Cluster

Physical cluster : maximum cooperative cluster

Logical cluster : clusters for sending and Receiving

Propose Self-healing process based cooperative clusters

3 Step- self healing mechanism

Communication Networks Research Lab.Communication Networks Research Lab.

3 Step- self healing mechanism

Step 1: The OTM selects neighbor DNs within a given cooperative distance from the failed DN as the members of a new physical cluster.

Step 2. Adjust the direction of beam of all DNs in the new physical cluster toward the failed DN and the beam width, by considering the location information of neighbor DNs in the new physical cluster.

Step 3. Adjust the transmit power of DNs in the new physical cluster applying new beam direction and beam width

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