23 results on '"Hyung-Kun Park"'
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2. Multi-Channel Allocation Scheme for Multi-Hop Transmission in Ad-hoc Cognitive Radio Networks
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Hyung-Kun Park and Young-Min Kwon
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Scheme (programming language) ,Cognitive radio ,General Computer Science ,Transmission (telecommunications) ,business.industry ,Computer science ,Hop (telecommunications) ,Radio resource management ,business ,computer ,Multi channel ,computer.programming_language ,Computer network - Published
- 2017
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Catalog
3. CHANNEL SELECTION SCHEME IN MULTI-HOP AND MULTI-CHANNEL COGNITIVE RADIO NETWORKS
- Author
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Hyung-Kun Park and Young-Min Kwon
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Scheme (programming language) ,General Computer Science ,Computer science ,business.industry ,Cognitive radio ,Channel (broadcasting) ,Electrical and Electronic Engineering ,Hop (telecommunications) ,Radio resource management ,business ,computer ,Multi channel ,Selection (genetic algorithm) ,computer.programming_language ,Computer network - Published
- 2016
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4. Distributed Channel Allocation for Ad-hoc Multichannel Cognitive Radio Networks
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Hyung-Kun Park and Young-Min Kwon
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Scheme (programming language) ,Channel allocation schemes ,business.industry ,Computer science ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,05 social sciences ,Probabilistic logic ,050801 communication & media studies ,020206 networking & telecommunications ,02 engineering and technology ,Interference (wave propagation) ,Channel scheduling ,Airfield traffic pattern ,0508 media and communications ,Cognitive radio ,Resource (project management) ,Control and Systems Engineering ,Computer Science::Networking and Internet Architecture ,0202 electrical engineering, electronic engineering, information engineering ,business ,computer ,computer.programming_language ,Computer network - Abstract
Cognitive radio network was proposed to use the spectrum resource more efficiently. In a multichannel ad-hoc cognitive radio network, there is no central station and requires distributed channel scheduling. An important requirement of the cognitive radio network is to avoid interference to primary networks. In this paper, the authors propose the distributed packet scheduling scheme for ad-hoc multichannel cognitive radio networks. Each secondary user calculates independently its own priority with probabilistic manner and selects one of multi channels considering the primary user’s traffic pattern to minimize interference to the primary networks. more...
- Published
- 2016
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5. Distributed Cognitive Radio MAC Protocol Considering User Fairness and Channel Quality
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Young-Min Kwon and Hyung-Kun Park
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General Computer Science ,Computer science ,business.industry ,Wireless ad hoc network ,media_common.quotation_subject ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,020206 networking & telecommunications ,02 engineering and technology ,Proportionally fair ,Cognitive radio ,0202 electrical engineering, electronic engineering, information engineering ,Fairness measure ,020201 artificial intelligence & image processing ,Quality (business) ,business ,Protocol (object-oriented programming) ,media_common ,Computer network ,Communication channel - Abstract
It is important that using of efficient radio resource because of deficiency spectrum problem, so that related to this problem many researches are have proceeded. To solve this problem, Cognitive Radio(CR) was suggested. The channels are allocated to the secondary users when the primary users don`t use the channels, and unfairness of secondary users can be serious problem and channel quality of multichannel can be different due to the different traffic pattern of primary users. In this paper, we propose MAC prtocol both of the user`s fairness and channel quality in CR networks. Simulation results show the comparison with CR MAC protocols. more...
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- 2016
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6. Channel Allocation Scheme considering Inter-Link Interference for Cognitive Radio Networks
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Hyung-Kun Park and Young-Min Kwon
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Scheme (programming language) ,Channel allocation schemes ,Computer science ,business.industry ,MIMO ,Co-channel interference ,Cognitive radio ,Interference (communication) ,Electrical and Electronic Engineering ,Radio resource management ,Link (knot theory) ,business ,computer ,computer.programming_language ,Computer network - Published
- 2016
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7. Handoff Scheme based on Adaptive Channel Prediction in Cognitive Radio Networks
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Hyung-Kun Park and Juhyeon Lee
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Scheme (programming language) ,General Computer Science ,business.industry ,Computer science ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Real-time computing ,Process (computing) ,Latency (audio) ,Data_CODINGANDINFORMATIONTHEORY ,Cognitive radio ,Transmission (telecommunications) ,Handover ,business ,computer ,Data transmission ,Communication channel ,Computer network ,computer.programming_language - Abstract
Spectrum handoff is the process of exchanging progressing data transmission from the current channel to another idle channel. The essential goal of spectrum handoff in CR(Cognitive Radio) networks is to perform consistent data transmission while sustaining performance of ongoing transmission of secondary users. This handoff procedure can cause additional latency that eventually affects on the performance of CR transmission. Channel prediction method is expected to avoid the disruption to primary users and to reduce the handoff latency. In this paper, adaptive channel prediction is proposed to cope with time-varying channel and an adaptive channel prediction based proactive handoff procedure is designed to enhance data transmission performance. more...
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- 2014
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8. Channel prediction-based channel allocation scheme for multichannel cognitive radio networks
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Hyung-Kun Park and Juhyeon Lee
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Channel allocation schemes ,Computer Networks and Communications ,business.industry ,Network packet ,Computer science ,Channel capacity ,Cognitive radio ,Interference (communication) ,Limit (music) ,Electronic engineering ,business ,Selection algorithm ,Computer Science::Information Theory ,Information Systems ,Computer network ,Communication channel - Abstract
Cognitive radio (CR) has been proposed to solve the spectrum utilization problem by dynamically exploiting the unused spectrum. In CR networks, a spectrum selection scheme is an important process to efficiently exploit the spectrum holes, and an efficient channel allocation scheme must be designed to minimize interference to the primary network as well as to achieve better spectrum utilization. In this paper, we propose a multichannel selection algorithm that uses spectrum hole prediction to limit the interference to the primary network and to exploit channel characteristics in order to enhance channel utilization. The proposed scheme considers both the interference length and the channel capacity to limit the interference to primary users and to enhance system performance. By using the proposed scheme, channel utilization is improved whereas the system limits the collision rate of the CR packets. more...
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- 2014
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9. Cooperative Node Selection for the Cognitive Radio Networks
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Xiang Gao, Juhyeon Lee, and Hyung-Kun Park
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Cognitive radio ,General Computer Science ,Computer science ,Frequency band ,business.industry ,Node (networking) ,Maximal-ratio combining ,Interference (wave propagation) ,business ,Selection (genetic algorithm) ,Computer network ,Cooperative diversity - Abstract
Cognitive radio has been recently proposed to dynamically access unused-spectrum. The CR users can share the same frequency band with the primary user without interference to each other. Usually each CR user needs to determine spectrum availability by itself depending only on its local observations. But uncertainty communication environment effects can be mitigated so that the detection probability is improved in a heavily shadowed environment. Soft detection is a primary user detection method of cooperative cognitive radio networks. In our research, we will improve system detection probability by using optimal cooperative node selection algorithm. New algorithm can find optimal number of cooperative sensing nodes for cooperative soft detection by using maximum ratio combining (MRC) method. Through analysis, proposed cooperative node selection algorithm can select optimal node for cooperative sensing according to the system requirement and improve the system detection probability. more...
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- 2013
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10. Cognitive Radio Channel Allocation using the Proportional Fair Scheduling
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Hyung-Kun Park and Juhyeon Lee
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General Computer Science ,Channel allocation schemes ,Computer science ,business.industry ,Throughput ,Proportionally fair ,Round-robin scheduling ,Frequency allocation ,Scheduling (computing) ,Cognitive radio ,Max-min fairness ,Fairness measure ,Maximum throughput scheduling ,Radio resource management ,business ,Computer Science::Information Theory ,Communication channel ,Computer network - Abstract
Cognitive radio technology enables us to utilize the extra spectrum which is not used by the primary users by sensing the channel condition. To use such an extra spectrum, spectrum allocation is one of the important issues in the cognitive radio networks. The network is dynamic and the available channels are changeable, and the opportunistic channel allocation is required to use the resource efficiently without interference to the primary networks. In this paper, modified proportional fairness scheduling is proposed for cognitive radio networks to satisfy the both fairness and system throughput, and the modified scheduling was designed to reduce the interference to the primary users. more...
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- 2012
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11. Novel Channel Allocation Scheme for the Multi-Channel Cognitive wireless Networks
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Hyung-Kun Park
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Scheme (programming language) ,General Computer Science ,Channel allocation schemes ,Computer science ,business.industry ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Data_CODINGANDINFORMATIONTHEORY ,Spectral efficiency ,Cognitive radio ,Transmission (telecommunications) ,Interference (communication) ,Radio resource management ,business ,computer ,Computer Science::Information Theory ,computer.programming_language ,Communication channel ,Computer network - Abstract
Channel allocation is one of the important issues in the multichannel transmission. In the cognitive radio networks, channel allocation scheme should be designed to improve spectrum efficiency without interfering with the transmission of licensed users. In this paper, we propose a spectrum hole prediction based channel allocation scheme. The proposed channel allocation scheme, predicts spectrum hole by using the channel success rate, and limit the transmission of secondary user`s data, and it reduces the interference to the primary user. The performance of proposed channel allocation scheme is evaluated by the computer simulation. more...
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- 2011
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12. Channel Statistical MAC Protocol for Cognitive Radio
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Wen-Min Zhu, Hyung-Kun Park, and Gao Xiang
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Computer Networks and Communications ,business.industry ,Computer science ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Transmitter ,Throughput ,Data_CODINGANDINFORMATIONTHEORY ,Link Access Procedures, D channel ,Cognitive radio ,Transmission (telecommunications) ,Control channel ,Computer Science::Networking and Internet Architecture ,Media Technology ,Electrical and Electronic Engineering ,business ,Computer Science::Information Theory ,Information Systems ,Computer network ,Data transmission ,Communication channel - Abstract
opportunistic spectrum access (OSA) allows unlicensed users to share licensed spectrum in space and time with no or little interference to primary users, with bring new research challenges in MAC design. We propose a cognitive MAC protocol using statistical channel information and selecting appropriate idle channel for transmission. The protocol based on the CSMA/CA, exploits statistics of spectrum usage for decision making on channel access. Idle channel availability, spectrum hole sufficiency and available channel condition will be included in algorithm statistical information. The model include the control channel and data channel, the transmitter negotiates with receiver on transmission parameters through control channel, statistical decision results (successful rate of transmission) from exchanged transmission parameters of control channel should pass the threshold and decide the data transmission with spectrum hole on data channel. A dynamical sensing range as a important parameter introduced to maintain the our protocol performance. The proposed protocol"s simulation will show that proposed protocol does improve the throughput performance via traditional opportunistic spectrum access MAC protocol. more...
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- 2010
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13. Channel Capacity-Based Multi-Channel Allocation in Cognitive Radio Networks
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Hyung-Kun Park and Juhyeon Lee
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Scheme (programming language) ,Engineering ,Channel allocation schemes ,business.industry ,Throughput ,Channel capacity ,Cognitive radio ,Interference (communication) ,Limit (music) ,Electronic engineering ,Electrical and Electronic Engineering ,Radio resource management ,business ,computer ,Computer Science::Information Theory ,computer.programming_language - Abstract
Dynamically exploiting unused-spectrum, cognitive radio has been proposed to solve spectrum utilization problem. In cognitive radio, it is important to minimize the interference to primary service as well as to provide efficient channel allocation. In this paper, we propose a multi-channel allocation scheme based on spectrum hole prediction. Proposed scheme considered both interference length and channel capacity to limit the interference to primary user as well as to enhance system performance. Simulation results show the proposed scheme improves the system throughput. more...
- Published
- 2013
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14. Chaotic Prediction Based Channel Sensing in CR System
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Xiang Gao, Juhyeon Lee, and Hyung-Kun Park
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Engineering ,Cognitive radio ,Transmission (telecommunications) ,business.industry ,Quality of service ,Process (computing) ,Chaotic ,Electronic engineering ,Sense (electronics) ,Electrical and Electronic Engineering ,business ,Focus (optics) ,Communication channel - Abstract
Cognitive radio (CR) has been recently proposed to dynamically access unused-spectrum. Since the spectrum availability for opportunistic access is determined by spectrum sensing, sensing control is identified as one of the most crucial issues of cognitive radio networks. Out-of-band sensing to find an available channels to sense. Sensing is also required in case of spectrum hand-off. Sensing process needs to be done very fast in order to enhance the quality of service (QoS) of the CR nodes, and transmission not to be cut for longer time. During the sensing, the PU(primary user) detection probability condition should be satisfied. We adopt a channel prediction method to find target channels. Proposed prediction method combines chaotic global method and chaotic local method for channel idle probability prediction. Global method focus on channel history information length and order number of prediction model. Local method focus on local prediction trend. Through making simulation, Proposed method can find an available channel with very high probability, total sensing time is minimized, detection probability of PU`s are satisfied. more...
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- 2013
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15. Channel Scheduling for Cognitive Radio Networks
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Hyung-Kun Park and Juhyeon Lee
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Engineering ,Schedule ,Cognitive radio ,business.industry ,Telecommunications link ,Fairness measure ,Throughput ,Proportionally fair ,Electrical and Electronic Engineering ,Radio resource management ,business ,Computer network ,Communication channel - Abstract
In Cognitive Radio network, spectrum selection scheme is one of a important part to manage idle spectrums efficiently. However, in CR networks, they have to adopt time-varying channel availability to minimize the interference to primary users (PU), and be able to manage spectrum resources efficiently. In this paper, we proposed a modified PF scheduler which can be appropriate to schedule downlink CR users and channels, by considering the fairness and the throughput as well as the primary user characteristics of each channel. more...
- Published
- 2012
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16. Sensing Period Adaptation using the Cost Function in the Cognitive Radio Networks
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Xiang Gao and Hyung-Kun Park
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Cognitive radio ,Computer science ,Spectrum availability ,media_common.quotation_subject ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Electronic engineering ,Electrical and Electronic Engineering ,Function (engineering) ,Adaptation (computer science) ,Communication channel ,media_common ,Data transmission - Abstract
Cognitive radio has been recently proposed to dynamically access unused-spectrum. Since the spectrum availability for opportunistic access is determined by spectrum sensing, sensing is identified as one of the most crucial issues of cognitive radio networks. The PHY-layer sensing, as a part of spectrum sensing in cognitive radio, concerns the sensing mechanism to determine channel to be sensed and to access. One of the important issues in the PHY-layer sensing control is to find an available sensing period and trade-off between spectrum sensing and data transmission. In this paper, we show the relationship between spectrum sensing and data transmission according to the sensing period. We analyze and propose the new scheme to evaluate optimal sensing period. more...
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- 2012
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17. Channel Selection Scheme using Statistical Properties in the Cognitive Radio Networks
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Hyung-Kun Park
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Scheme (programming language) ,Engineering ,business.industry ,Cognitive radio ,Interference (communication) ,Electronic engineering ,Electrical and Electronic Engineering ,business ,computer ,Statistic ,Selection (genetic algorithm) ,Computer Science::Information Theory ,Communication channel ,computer.programming_language - Abstract
In a CR (cognitive radio) network, channel selection is one of the important issues for the efficient channel utilization. When the CR user exploits the spectrum of primary network, the interference to the primary network should be minimized. In this paper, we propose a spectrum hole prediction based channel selection scheme to minimize the interference to the primary network. To predict spectrum hole, statistic properties of primary user`s traffic is used. By using the predicted spectrum hole, channel is selected and it can reduce the possibility of interference to the primary user and increase the efficiency of spectrum utilization. The performance of proposed channel selection scheme is evaluated by the computer simulation. more...
- Published
- 2011
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18. In-Band MAC-Layer Sensing for the Cognitive Radio Networks
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Hyung-Kun Park and Xiang Gao
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Cognitive radio ,Computer science ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Real-time computing ,Key (cryptography) ,Throughput ,Layer (object-oriented design) ,Interference (wave propagation) ,Collision ,Communication channel ,Data transmission - Abstract
Channel sensing in the cognitive radio networks is a very important function to avoid collision with primary users. MAC-layer sensing determines key parameters for channel sensing such as available sensing period and sensing duration. The sensing period and sensing duration affect on the data transmission. The shorter sensing period increases the sensing accuracy and reduces the possibility of packet collision with primary users. However, it can reduce the data transmission time and decrease the system throughput. Therefore, one of the important roles of MAC-layer sensing is to determine the sensing period. In this paper, we evaluate the sensing period to minimize the missing probability and interference probability to the primary users. more...
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- 2013
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19. Modified proportional fair scheduling for Cognitive Radio networks
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Nam-Ho Kim, Yun Seop Yu, Hyung-Kun Park, and Juhyeon Lee
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Base station ,Cognitive radio ,Channel allocation schemes ,Computer science ,business.industry ,Fairness measure ,Proportionally fair ,Maximum throughput scheduling ,Round-robin scheduling ,business ,Computer Science::Information Theory ,Scheduling (computing) ,Computer network - Abstract
Channel selection is one of important issues in Cognitive Radio (CR) networks and it is closely related to the channel characteristics and primary user's behavior. In this paper, we proposed a modified proportional fairness scheduling which not only consider the fairness and the throughput but also take the primary user characteristics of each channel into account. more...
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- 2012
- Full Text
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20. Channel allocation using spectrum hole prediction in CR networks
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Hyung-Kun Park
- Subjects
Channel allocation schemes ,Computer science ,business.industry ,Throughput ,Spectral efficiency ,Cognitive radio ,Transmission (telecommunications) ,Interference (communication) ,Electronic engineering ,Transceiver ,business ,Computer Science::Information Theory ,Communication channel ,Computer network - Abstract
To minimize interference in the primary network is the most important requirement in CR (Cognitive Radio) networks. Channel allocation algorithm should be designed to improve spectrum efficiency without interfering in the transmission of licensed users. In this paper, we propose a spectrum-hole prediction based channel allocation scheme. To predict spectrum hole, statistic properties of primary user's traffic is used. By using the predicted spectrum hole, channel can be selected opportunistically and it can reduce the possibility of interference with the primary user and increase the efficiency of spectrum utilization. The performance of proposed channel allocation scheme is evaluated by the computer simulation. more...
- Published
- 2012
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21. Optimal sensing period for the cognitive radio networks.
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Gao Xiang and Hyung-Kun Park
- Abstract
The PHY-layer sensing, as a key component of spectrum sensing in cognitive radio, concerns the sensing mechanism to determine when to sense channel for detection and which channel to access. One of the important issues in the PHY-layer sensing control is to find an available sensing period and trade-off between spectrum sensing and data transmission. The larger sensing time leads to higher sensing accuracy, less interference but shorter transmission time. Oppositely if we want hold much more transmission time, the sensing time should be decreased, and the interference to primary user will increase. In this paper, we show the relationship between spectrum sensing and data transmission according to the sensing period. We analyze and propose the new scheme to evaluate optimal sensing period. [ABSTRACT FROM PUBLISHER] more...
- Published
- 2012
22. Interference-Aware Channel Selection for Cognitive Radio Networks.
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Young-Min Kwon and Hyung-Kun Park
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ELECTRIC interference ,RADIO networks ,COGNITIVE radio ,RADIO frequency allocation ,PROBABILITY theory - Published
- 2016
23. Modified proportional fair scheduling for Cognitive Radio networks.
- Author
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Juhyeon Lee, Hyung-Kun Park, Nam Ho Kim, and Yun Seop Yu
- Abstract
Channel selection is one of important issues in Cognitive Radio (CR) networks and it is closely related to the channel characteristics and primary user's behavior. In this paper, we proposed a modified proportional fairness scheduling which not only consider the fairness and the throughput but also take the primary user characteristics of each channel into account. [ABSTRACT FROM PUBLISHER] more...
- Published
- 2012
- Full Text
- View/download PDF
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