• 제목/요약/키워드: Cellular network

검색결과 905건 처리시간 0.035초

Energy Efficiency Analysis of Cellular Downlink Transmission with Network Coding over Rayleigh Fading Channels

  • Zhu, Jia
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제7권3호
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    • pp.446-458
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    • 2013
  • Recently, energy-efficient cellular transmission has received considerable research attention to improve the energy efficiency of wireless communication. In this paper, we consider a cellular network consisting of one base station (BS) and multiple user terminals and explore the network coding for enhancing the energy efficiency of cellular downlink transmission from BS to users. We propose the network coded cellular transmission scheme and conduct its energy consumption analysis with target outage probability and data rate requirements in Rayleigh fading environments. Then, the energy efficiency in Bits-per-Joule is further defined and analyzed to evaluate the number of bits delivered per Joule of energy cost. Numerical results show that the network coded cellular transmission significantly outperforms the traditional cellular transmission in terms of energy efficiency, implying that given a Joule of energy cost, the network coded cellular transmission scheme can deliver more bits than the traditional cellular transmission.

그래픽 처리장치 기반 클라우드 컴퓨팅의 셀룰러 네트워크 응용 (Applying the Graphic Processing Unit Based Cloud Computing in Cellular Network)

  • 김준;최승원
    • 디지털산업정보학회논문지
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    • 제8권3호
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    • pp.75-85
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    • 2012
  • In general, cellular network is deployed as distributed network architecture, so network equipment is spread out all over the coverage area. This case causes high cost. Recently, centralized network architecture has been deployable at cellular network since base station was able to be virtualized due to advance in computing power. The centralized network architecture in cellular network adjusts its cell radius dynamically and minimizes power consumption of the network. This paper introduces a new centralized deployment way of cellular network using SDR and cloud computing technology. Then, advantage and feasibility of the new network will be reviewed by implementing this novel network.

셀룰러 망에서 SIP 재전송 간격조절에 의한 성능 개선과 이를 이용한 홈 네트워크 구현 (Improving the Performance of Cellular Network by Controlling SIP Retransmission Time Interval and Implementing Home Network)

  • 권경희;김진희;고윤미
    • 한국콘텐츠학회논문지
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    • 제8권2호
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    • pp.67-73
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    • 2008
  • 최근 이동통신의 급격한 발전으로 인해 IP를 기반으로 한 네트워크에서 제공되던 멀티미디어 서비스가 이동단말기에서도 가능케 되고 있다. 셀룰러 망에서는 다양한 멀티미디어 서비스를 제공하기 위해 SIP(Session initiation Protocol)를 호 설정 프로토콜로 사용하는 추세이다. 그러나 높은 비트 에러율, 좁은 대역폭을 사용하는 셀룰러 망에서 기존 SIP RTI(Retransmission Time Interval : 재전송 타임 간격) 값은 오히려 네트워크 성능을 저하시키고 호 설정 시간을 지연시킨다. 본 논문에서는 시뮬레이터 NS-2를 이용하여 셀룰러 망에서의 호 설정 시간을 최소화하는 적합한 SIP RTI 값을 찾아 성능을 향상하였고 그 값을 적용하여 SIP를 이용한 홈 네트워크를 설계, 구현하였다.

Capacity Enhancement of Uni-directional In-band Full-Duplex Cellular Networks through Co-channel Interference Cancellation

  • Ju, Hyungsik;Gwak, Donghyuk;Kim, Sun-Ae;Lee, Yuro;Kim, Tae-Joong
    • ETRI Journal
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    • 제40권2호
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    • pp.207-217
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    • 2018
  • As implementation of the in-band full duplex (IFD) transceiver becomes feasible, research interest is growing with respect to using IFD communication with cellular networks. However, the cellular network in which the IFD communication is applied inevitably suffers from an increase of the co-channel interference (CCI) due to IFD simultaneous transmission and reception. In this paper, we analyze the performance of a cellular network based on uni-directional IFD (UD-IFD) communication, wherein an IFD base station simultaneously supports downlink and uplink transmissions of half-duplex (HD) users. In addition, a multi-pair CCI cancellation (MP-CCIC) method combining CCIC and user pairing is proposed to improve the performance of the UD-IFD network. Simulation results showed that, compared to a conventional HD cellular network without using CCIC, capacity gain was not obtained in the UD-IFD cellular network. On the other hand, when applying the proposed MP-CCIC, the capacity of the UD-IFD cellular network greatly improved compared to that of an HD cellular network.

Interference Mitigation Scheme for Device-to-Device MIMO Communications Underlaying a Cellular Network

  • Nam, Yujin;So, Jaewoo;Kim, Jinsung
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제11권4호
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    • pp.1841-1865
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    • 2017
  • This paper proposes a new interference mitigation scheme for device-to-device (D2D) communications underlaying a cellular network. The object of the proposed scheme is to determine the number of data streams, a precoding matrix, and a decoding matrix of D2D networks so as to maximize the system capacity given the number of data streams of a cellular network while satisfying the constraint of the inter-system interference from D2D networks to the cellular network. Unlike existing interference mitigation schemes based on the interference alignment technique, the proposed scheme operates properly regardless of the number of data streams of a cellular network and moreover it does not require changing the precoding and decoding matrices of a cellular network. The simulation results demonstrate that the proposed scheme significantly increases the system capacity by mitigating the intra- and inter-system interference.

A D2D communication architecture under full control using SDN

  • Ngo, Thanh-Hai;Kim, Younghan
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제10권8호
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    • pp.3435-3454
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    • 2016
  • Device-to-device (D2D) communication is a potential solution to the incessant increase in data traffic on cellular networks. The greatest problem is how to control the interference between D2D users and cellular mobile users, and between D2D users themselves. This paper proposes a solution for this issue by putting the full control privilege in cellular network using the software-defined networking (SDN) concept. A software virtual switch called Open vSwitch and several components are integrated into mobile devices for data forwarding and radio resource mapping, whereas the control functions are executed in the cellular network via a SDN controller. This allows the network to assign radio resources for D2D communication directly, thus reducing interference. This solution also brings out many benefits, including resource efficiency, energy saving, topology flexibility, etc. The advantages and disadvantages of this architecture are analyzed by both a mathematical method and a simple implementation. The result shows that implementation of this solution in the next generation of cellular networks is feasible.

진화하는 셀룰라 오토마타 신경망의 하드웨어 구현에 관한 연구 (A Study on Implementation of Evolving Cellular Automata Neural System)

  • 반창봉;곽상영;이동욱;심귀보
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2001년도 추계학술대회 학술발표 논문집
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    • pp.255-258
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    • 2001
  • This paper is implementation of cellular automata neural network system which is a living creatures' brain using evolving hardware concept. Cellular automata neural network system is based on the development and the evolution, in other words, it is modeled on the ontogeny and phylogeny of natural living things. The proposed system developes each cell's state in neural network by CA. And it regards code of CA rule as individual of genetic algorithm, and evolved by genetic algorithm. In this paper we implement this system using evolving hardware concept Evolving hardware is reconfigurable hardware whose configuration is under the control of an evolutionary algorithm. We design genetic algorithm process for evolutionary algorithm and cells in cellular automata neural network for the construction of reconfigurable system. The effectiveness of the proposed system is verified by applying it to time-series prediction.

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A Distributed Power Optimization Method for CDMA Cellular Mobile Systems Using an Adaptive Search Scheme

  • Lee, Young-Dae
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.1982-1985
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    • 2003
  • Future cellular networks will mainly be driven by, high quality channels, high band with utilization, low power consumption and efficient network management. For a given channel allocation, the capacity and quality of communication of cellular radio systems using CDMA(Code Division Multiple Access) can be increased by using a transmitter power control scheme to combat the near-far problem. Centralized power control schemes or distributed ones to maximize the minimum signal-to-interference in each user of CDMA wireless network have been investigated. This paper has proposed a distributed power control algorithm, which employs an adaptive search scheme, in order to solve quickly the linear systems of equations for power update in CDMA cellular radio systems. The simulation results show that the proposed scheme has faster convergence rate than the typical bang-bang type of distributed power control algorithm, which has been much used as a reference algorithm in IS-95A and W-CDMA communication network.

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라그랑지안 기반의 휴리스틱 기법을 이용한 셀룰러 모바일 네트워크의 설계 (Designing Cellular Mobile Network Using Lagrangian Based Heuristic)

  • 홍정만;이종협
    • 대한산업공학회지
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    • 제37권1호
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    • pp.19-29
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    • 2011
  • Cellular network is comprised of several base stations which serve cellular shaped service area and each base station (BS) is connected to the mobile switching center (MSC). In this paper, the configuration modeling and algorithm of a cellular mobile network with the aim of minimizing the overall cost of operation (handover) and network installation cost (cabling cost and installing cost of mobile switching center) are considered. Handover and cabling cost is one of the key considerations in designing cellular telecommunication networks. For real-world applications, this configuration study covers in an integrated framework for two major decisions: locating MSC and assigning BS to MSC. The problem is expressed in an integer programming model and a heuristic algorithm based on Lagrangian relaxation is proposed to resolve the problem. Searching for the optimum solution through exact algorithm to this problem appears to be unrealistic considering the large scale nature and NP-Completeness of the problem. The suggested algorithm computes both the bound for the objective value of the problem and the feasible solution for the problem. A Lagrangian heuristics is developed to find the feasible solution. Numerical tests are performed for the effectiveness and efficiency of the proposed heuristic algorithm. Computational experiments show that the performance of the proposed heuristics is satisfactory in the quality of the generated solution.

유전자 알고리즘을 이용한 다중계층 채널할당 셀룰러 네트워크 설계 (Hierarchical Cellular Network Design with Channel Allocation Using Genetic Algorithm)

  • 이상헌;박현수
    • 한국경영과학회:학술대회논문집
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    • 한국경영과학회 2005년도 추계학술대회 및 정기총회
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    • pp.321-333
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    • 2005
  • With the limited frequency spectrum and an increasing demand for cellular communication services, the problem of channel assignment becomes increasingly important. However, finding a conflict free channel assignment with the minimum channel span is NP hard. As demand for services has expanded in the cellular segment, sever innovations have been made in order to increase the utilization of bandwidth. The innovations are cellular concept, dynamic channel assignment and hierarchical network design. Hierarchical network design holds the public eye because of increasing demand and quality of service to mobile users. We consider the frequency assignment problem and the base station placement simultaneously. Our model takes the candidate locations emanating from this process and the cost of assigning a frequency, operating and maintaining equipment as an input. In addition, we know the avenue and demand as an assumption. We propose the network about the profit maximization. This study can apply to GSM(Global System for Mobile Communication) which has 70% portion in the world. Hierarchical network design using GA(Genetic Algorithm) is the first three-tier (Macro, Micro, Pico) model, We increase the reality through applying to EMC (Electromagnetic Compatibility Constraints). Computational experiments on 72 problem instances which have 15${\sim}$40 candidate locations demonstrate the computational viability of our procedure. The result of experiments increases the reality and covers more than 90% of the demand.

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