Search results for: Kyuho Son

Items from 1 to 20 out of 26 results

article

Dynamic cell reconfiguration framework for energy conservation in cellular wireless networks

Kyuho Son, Ranjini Guruprasad, Santosh Nagaraj, Mahasweta Sarkar, more

Journal of Communications and Networks > 2016 > 18 > 4 > 567 - 579

Several energy saving techniques in cellular wireless networks such as active base station (BS) selection, transmit power budget adaptation and user association have been studied independently or only part of these aspects have been considered together in literature. In this paper, we jointly tackle these three problems and propose an integrated framework, called dynamic cell reconfiguration (DCR)...

article

A Unified Base Station Switching Framework Considering Both Uplink and Downlink Traffic

Eunsung Oh, Kyuho Son

IEEE Wireless Communications Letters > 2017 > 6 > 1 > 30 - 33

This letter studies the dynamic operation of macro base stations (BSs) for potential energy savings. Unlike existing work in literature, most of which overlooked the importance of uplink (UL) traffic, we develop a generalized framework for a dynamic BS operation that not only considers the downlink (DL) traffic load but also the UL traffic load. The proposed BS switching sequential algorithm, which...

chapter

A congestion avoidance algorithm in SDN environment

Seungbeom Song, Jaiyong Lee, Kyuho Son, Hangyong Jung, more

2016 International Conference on Information Networking (ICOIN) > 420 - 423

2016 International Conference on Information Networking (ICOIN)

It is expected that large number of IoT devices and IoT network will be connected to the Internet. In these environments, congestion of network links could be rapidly increased due to the bust IoT traffic especially related with video devices. To avoid the congestion, currently, End-devices control the congestion links by using congestion control scheme on TCP stack such as Tahoe, Reno, NewReno, and...

chapter

Power-efficient base station operation through user QoS-aware adaptive RF chain switching technique

Ranjini Guruprasad, Kyuho Son, Sujit Dey

2015 IEEE International Conference on Communications (ICC) > 244 - 250

ICC 2015 - 2015 IEEE International Conference on Communications

In this paper, we develop a user Quality of Service (QoS) aware adaptive Radio Frequency (RF) chain switching technique that dynamically adapts the number of active RF chains to minimize the total power consumption of the base station (BS). Specifically, we first formulate an optimization problem to minimize the total power consumption under the throughput and Block Error Rate (BLER) requirements...

article

Energy-efficient design of heterogeneous cellular networks from deployment to operation

Kyuho Son, Eunsung Oh, Bhaskar Krishnamachari

Computer Networks > 2015 > 78 > Complete > 95-106

The ever-increasing traffic demand has motivated mobile operators to explore how they can boost their network capacity with a minimal increase in their capital and operating expenditures. In order to tackle this problem, we investigate the energy-efficient design of heterogeneous cellular network (or simply HetNet), especially with a focus on deployment and operation strategies. We first formulate...

chapter

QoS-aware dynamic cell reconfiguration for energy conservation in cellular networks

Kyuho Son, Santosh Nagaraj, Mahasweta Sarkar, Sujit Dey

2013 IEEE Wireless Communications and Networking Conference (WCNC) > 2022 - 2027

2013 IEEE Wireless Communications and Networking Conference (WCNC)

Given the significant energy consumption in operating base stations (BSs), improving their energy efficiency is an important problem in cellular networks. To this end, this paper proposes a novel framework, called DCR (dynamic cell reconfiguration) that dynamically adjust the set of active BSs and user association according to user traffic demand for energy conservation. In order to overcome prohibitive...

article

Dynamic Base Station Switching-On/Off Strategies for Green Cellular Networks

Eunsung Oh, Kyuho Son, Bhaskar Krishnamachari

IEEE Transactions on Wireless Communications > 2013 > 12 > 5 > 2126 - 2136

In this paper, we investigate dynamic base station (BS) switching to reduce energy consumption in wireless cellular networks. Specifically, we formulate a general energy minimization problem pertaining to BS switching that is known to be a difficult combinatorial problem and requires high computational complexity as well as large signaling overhead. We propose a practically implementable switching-on/off...

article

Power allocation policies with full and partial inter-system channel state information for cognitive radio networks

Kyuho Son, Bang Chul Jung, Song Chong, Dan Keun Sung

Wireless Networks > 2013 > 19 > 1 > 99-113

This paper investigates several power allocation policies in orthogonal frequency division multiplexing -based cognitive radio networks under the different availability of inter-system channel state information (CSI) and the different capability of licensed primary users (PUs). Specifically, we deal with two types of PUs having different capabilities: a dumb (peak interference-power tolerable) PU...

chapter

SpeedBalance: Speed-scaling-aware optimal load balancing for green cellular networks

Kyuho Son, Bhaskar Krishnamachari

2012 Proceedings IEEE INFOCOM > 2816 - 2820

IEEE INFOCOM 2012 - IEEE Conference on Computer Communications

This paper considers a component-level deceleration technique in BS operation, called speed-scaling, that is more conservative than entirely shutting down BSs, yet can conserve dynamic power effectively during periods of low load while ensuring full coverage at all times. By formulating a total cost minimization that allows for a flexible tradeoff between delay and energy, we first study how to adaptively...

article

Base Station Association in Wireless Cellular Networks: An Emulation Based Approach

Soohwan Lee, Kyuho Son, Huazhi Gong, Yung Yi

IEEE Transactions on Wireless Communications > 2012 > 11 > 8 > 2720 - 2729

In order to utilize network resources efficiently and reduce regional congestion, associating mobile stations (MSs) with proper base stations (BSs) is of crucial importance in wireless cellular networks. There have been several load-aware proposals in literature, where most are classified into so-called closed-form approaches. In such approaches, each MS independently and deterministically selects...

article

Greening Effect of Spatio-Temporal Power Sharing Policies in Cellular Networks with Energy Constraints

Jeongho Kwak, Kyuho Son, Yung Yi, Song Chong

IEEE Transactions on Wireless Communications > 2012 > 11 > 12 > 4405 - 4415

Greening effect in interference management (IM), a way of enhancing spectrum sharing via intelligent transmit power control, can be achieved by the fact that as BSs moderately reduce their transmit powers, the performance degradation decreases slower than linearly, yet a considerable overall energy saving is expected due to transmit powers' exerting influence on operational power. This paper investigates...

article

Two-Hop Opportunistic Scheduling in Cooperative Cellular Networks

Jihwan Kim, Joohyun Lee, Kyuho Son, Seungho Song, more

IEEE Transactions on Vehicular Technology > 2012 > 61 > 9 > 4194 - 4199

Due to the tradeoff between capacity and fairness in a wide variety of networks, increasing one objective may deteriorate the other. This paper investigates the possibility of improving capacity and fairness at the same time, specifically in two-hop cellular networks. First, we prove that an achievable capacity region can be enlarged by using relay, i.e., the capacity and fairness tradeoff relationship...

chapter

Impact of spatio-temporal power sharing policies on cellular network greening

Jeongho Kwak, Kyuho Son, Yung Yi, Song Chong

2011 International Symposium of Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks > 167 - 174

2011 International Symposium of Modeling and Optimization of Mobile, Ad Hoc, and Wireless Networks (WiOpt)

Greening effect in interference management (IM), which is a technology to enhance spectrum sharing via intelligent BS transmit power control, can be achieved by the fact that even small reduction in BS transmit powers enables considerable saving in overall energy consumption due to their exerting influence on operational powers. In this paper, we study the impact of power sharing policies in IM schemes...

chapter

Energy-aware hierarchical cell configuration: From deployment to operation

Kyuho Son, Eunsung Oh, Bhaskar Krishnamachari

2011 IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS) > 289 - 294

IEEE INFOCOM 2011 - IEEE Conference on Computer Communications Workshops

This paper develops an energy-aware hierarchical cell configuration framework that encompasses both deployment and operation in downlink cellular networks. Specifically, we first formulate a general problem pertaining to total energy consumption minimization while satisfying the requirement of area spectral efficiency (ASE), and then decompose it into deployment problem at peak time and operation...

article

Utility-Optimal Multi-Pattern Reuse in Multi-Cell Networks

Kyuho Son, Yung Yi, Song Chong

IEEE Transactions on Wireless Communications > 2011 > 10 > 1 > 142 - 153

Achieving sufficient spatial capacity gain through the use of small cells requires careful consideration of inter-cell interference (ICI) management via BS power coordination coupled with user scheduling inside cells. Optimal algorithms are known to be difficult to implement due to high computation and signaling overhead. This study proposes joint pattern-based ICI management and user scheduling algorithms...

article

Base Station Operation and User Association Mechanisms for Energy-Delay Tradeoffs in Green Cellular Networks

Kyuho Son, Hongseok Kim, Yung Yi, Bhaskar Krishnamachari

IEEE Journal on Selected Areas in Communications > 2011 > 29 > 8 > 1525 - 1536

Energy-efficiency, one of the major design goals in wireless cellular networks, has received much attention lately, due to increased awareness of environmental and economic issues for network operators. In this paper, we develop a theoretical framework for BS energy saving that encompasses dynamic BS operation and the related problem of user association together. Specifically, we formulate a total...

article

REFIM: A Practical Interference Management in Heterogeneous Wireless Access Networks

Kyuho Son, Soohwan Lee, Yung Yi, Song Chong

IEEE Journal on Selected Areas in Communications > 2011 > 29 > 6 > 1260 - 1272

Due to the increasing demand of capacity in wireless cellular networks, the small cells such as pico and femto cells are becoming more popular to enjoy a spatial reuse gain, and thus cells with different sizes are expected to coexist in a complex manner. In such a heterogeneous environment, the role of interference management (IM) becomes of more importance, but technical challenges also increase,...

chapter

Practical dynamic interference management in multi-carrier multi-cell wireless networks: A reference user based approach

Kyuho Son, Soohwan Lee, Yung Yi, Song Chong

8th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks > 186 - 195

2010 8th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt)

In order to overcome low performance of conventional static interference management algorithms and high complexity of existing dynamic interference management algorithms, this paper proposes an efficient, low-complex and fully distributed power control and user scheduling algorithm in downlink multi-carrier multi-cell wireless networks. We decompose the original optimization problem, which requires...

article

Feedback Reduction for Multiuser OFDM Systems

Jeongho Jeon, Kyuho Son, Hyang-Won Lee, Song Chong

IEEE Transactions on Vehicular Technology > 2010 > 59 > 1 > 160 - 169

Feedback reduction in multiuser orthogonal frequency-division multiplexing (OFDM) systems has become an important issue due to the excessive amount of feedback required to use opportunistic scheduling, particularly when the number of users and carriers is large. In this paper, we propose a novel feedback-reduction scheme for efficient downlink scheduling. In the proposed scheme, each user determines...

chapter

QoS Scheduling for Heterogeneous Traffic in OFDMA-Based Wireless Systems

Youngki Kim, Kyuho Son, Song Chong

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference > 1 - 6

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

In this paper, we propose a scheduling framework for heterogeneous traffic in OFDMA-based wireless systems. The proposed scheduling algorithm not only satisfies the QoS requirements of the real-time traffic but also maximizes the utility of the non real-time traffic. Step-by-step approach is used to achieve these two objectives simultaneously with low complexity and traffic class prioritization. A...

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HEURISTIC ALGORITHMS (8)
INTERFERENCE (8)
THROUGHPUT (7)
RESOURCE MANAGEMENT (6)
SCHEDULING (6)
ALGORITHM DESIGN AND ANALYSIS (5)
CELLULAR RADIO (5)
MULTICELL NETWORKS (4)
RADIOFREQUENCY INTERFERENCE (4)
WIRELESS COMMUNICATION (4)
COMPLEXITY THEORY (3)
OFDM MODULATION (3)
POWER CONTROL (3)
POWER DEMAND (3)
QUALITY OF SERVICE (3)
TELECOMMUNICATION NETWORK MANAGEMENT (3)
USER SCHEDULING (3)
CELLULAR NETWORKS (2)
COGNITIVE RADIO (2)
DELAY (2)
DOWNLINK (2)
ENERGY CONSERVATION (2)
ENERGY CONSUMPTION (2)
ENERGY EFFICIENCY (2)
ENERGY SAVING (2)
ENERGY-EFFICIENT (2)
FREQUENCY DIVISION MULTIPLE ACCESS (2)
GREEN CELLULAR NETWORKS (2)
INTERCELL INTERFERENCE (2)
INTERFERENCE AVOIDANCE (2)
JOINTS (2)
LOAD BALANCING (2)
LOAD MANAGEMENT (2)
MOBILE COMMUNICATION (2)
NETWORK TOPOLOGY (2)
OFDM (2)
OPPORTUNISTIC SCHEDULING (2)
OPTIMISATION (2)
POWER ALLOCATION (2)
RADIO NETWORKS (2)
SCHEDULING ALGORITHM (2)
SIGNAL TO NOISE RATIO (2)
USER ASSOCIATION (2)
USER SCHEDULING ALGORITHM (2)
ACTIVE BASE STATION (BS) SELECTION (1)
ADAPTIVE MULTIPATTERN REUSE (1)
APPROXIMATION ALGORITHMS (1)
AVERAGE THROUGHPUT (1)
BASE STATION (1)
BASE STATION ASSOCIATION (1)
BASE STATION OPERATION (1)
BASE STATION POWER COORDINATION (1)
BASE STATION SWITCHING ON/OFF (1)
BASE STATIONS (1)
BETA DEADLINE PARAMETER (1)
BIPARTITE MATCHING ALGORITHM (1)
BS POWER COORDINATION (1)
BS SWITCHING ON/OFF (1)
CAPACITY (1)
CELL SITE SELECTION MECHANISMS (1)
CELL-EDGE USERS (1)
CELLULAR SYSTEM (1)
CHANNEL QUALITY INDICATOR (CQI) FEEDBACK (1)
CHROMIUM (1)
COMPUTATIONAL COMPLEXITY (1)
COMPUTER SCIENCE (1)
CONGESTION AVOIDANCE ALGORITHM (1)
CONTRACTS (1)
CONTROL SYSTEMS (1)
COOPERATIVE RELAYING (1)
DATA MINING (1)
DELAYS (1)
DEPLOYMENT (1)
DIFFERENT CELL SIZE (1)
DISTRIBUTED ALGORITHM (1)
DIVERSITY RECEPTION (1)
DOWNLINK SCHEDULING (1)
DOWNLINK SIGNALS (1)
DYNAMIC ASSOCIATION (1)
DYNAMIC BS OPERATION (1)
DYNAMIC IM ALGORITHM (1)
EFFICIENCY BASED FEEDBACK REDUCTION (1)
EMULATION-BASED (1)
ENERGY-EFFICIENCY (1)
ENERGY-SAVING REGULATIONS (1)
EQUATIONS (1)
ESTIMATION (1)
FAIRNESS (1)
FEEDBACK (1)
FEEDBACK EFFICIENCY (1)
FEEDBACK REDUCTION (1)
FEEDBACK REDUCTION SCHEME (1)
FEMTO CELLS (1)
FLOW-LEVEL DYNAMICS (1)
FREQUENCY ALLOCATION (1)
FREQUENCY DIVISION MULTIPLEXING (1)
FREQUENCY-SELECTIVE CHANNELS (1)
GAIN (1)
GREEDY ALGORITHM (1)
GREEDY ALGORITHMS (1)
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INFONA - science communication portal

Search results for: Kyuho Son

Dynamic cell reconfiguration framework for energy conservation in cellular wireless networks

A Unified Base Station Switching Framework Considering Both Uplink and Downlink Traffic

A congestion avoidance algorithm in SDN environment

Power-efficient base station operation through user QoS-aware adaptive RF chain switching technique

Energy-efficient design of heterogeneous cellular networks from deployment to operation

QoS-aware dynamic cell reconfiguration for energy conservation in cellular networks

Dynamic Base Station Switching-On/Off Strategies for Green Cellular Networks

Power allocation policies with full and partial inter-system channel state information for cognitive radio networks

SpeedBalance: Speed-scaling-aware optimal load balancing for green cellular networks

Base Station Association in Wireless Cellular Networks: An Emulation Based Approach

Greening Effect of Spatio-Temporal Power Sharing Policies in Cellular Networks with Energy Constraints

Two-Hop Opportunistic Scheduling in Cooperative Cellular Networks

Impact of spatio-temporal power sharing policies on cellular network greening

Energy-aware hierarchical cell configuration: From deployment to operation

Utility-Optimal Multi-Pattern Reuse in Multi-Cell Networks

Base Station Operation and User Association Mechanisms for Energy-Delay Tradeoffs in Green Cellular Networks

REFIM: A Practical Interference Management in Heterogeneous Wireless Access Networks

Practical dynamic interference management in multi-carrier multi-cell wireless networks: A reference user based approach

Feedback Reduction for Multiuser OFDM Systems

QoS Scheduling for Heterogeneous Traffic in OFDMA-Based Wireless Systems

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