• Title, Summary, Keyword: LTE distribution

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A Study on Improvement of LTE-WiFi Vertical Handover Efficiency (LTE-WiFi Vertical 핸드오버 효율향상 방안 연구)

  • Joo, Young-Hwan;Lim, Seung-Cheol
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.2
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    • pp.127-134
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    • 2017
  • In this paper, we try to solve the frequency shortage due to the increase of LTE terminals and the traffic jam caused by the inefficient WiFi connection method. The proposed LTE-WIFI Vertical Handover method uses a pre-authentication method of the AP through LTE and a method of controlling the access AP of the terminal using the RADIUS server. Through the simulation, the proposed method shows that the access speed of the AP is improved by about 95% compared to the conventional connection method, and the connection speed is improved by about 18% compared to the conventional method. Providing seamless AP through pre-authentication system and improving wireless network speed through AP access distribution can solve LTE frequency shortage problem and improve wireless network usage satisfaction.

Introducing the Latest 3GPP Specifications and their Potential for Future AMI Applications

  • Koumadi, Koudjo M.;Park, Byong-seok;Myoung, Nogil
    • KEPCO Journal on Electric Power and Energy
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    • v.2 no.2
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    • pp.245-251
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    • 2016
  • Despite the exponential throughput improvement in mobile communications systems, their ability to satisfy requirements of state-of-the-art and future applications of advanced metering infrastructure (AMI) is still under investigation. Challenges are mainly due to the inadequacy of third generation partnership project (3GPP) networks to support large amounts of devices simultaneously, while the number of AMI end-devices and the frequency of their data transmission increase with new AMI-based applications. In this introductory survey, innovative and future AMI applications and their communication requirements are first reviewed. Then, we identify challenges of 3GPP long term evolution (LTE) in enabling future AMI applications. More importantly, the latest improvements to LTE-A standard release 12 and 13 are reviewed and analyzed with regards to their potential to improve the quality of LTE-enabled AMI. It is found that 3GPP enhancements on machine type communications (MTC) standards will significantly enhance AMI communications. Beyond MTC specifications, non-MTC-specific enhancements such as carrier aggregation and multi-connectivity for user equipment will also contribute greatly to improving reliability and availability of AMI devices. The paper's focus is towards improved backhaul support for innovative and future AMI applications, beyond traditional automatic meter reading.

Performance Analysis of Coordinated Multi-Point with Scheduling and Precoding schemes in LTE-Advanced System (LTE-Advanced 시스템에서 스케줄링 및 프리코딩을 결합한 다중 포인트 협력 통신 기법의 성능 분석)

  • Kim, Bora;Moon, Sangmi;Malik, Saransh;Kim, Cheolsung;Hwang, Intae
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.7
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    • pp.27-33
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    • 2013
  • In this paper, we design and analyze the performance of Coordinated Multi-Point (CoMP) techniques to the number of users for next-generation cellular systems. We perform Monte Carlo simulations with Long Term Evolution-Advanced (LTE-Advanced) and confirm the performance from the graph of the Cumulative Distribution Function (CDF). From simulation results, we show the significant performance gain when CoMP technique is used and also show better performance when we apply the various schemes additionally as scheduling and precoding.

A Certificate Revocation List Distribution Scheme over the eMBMS for Vehicular Networks

  • Kim, Hyun-Gon
    • Journal of the Korea Society of Computer and Information
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    • v.21 no.10
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    • pp.77-83
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    • 2016
  • To verify the trustworthiness of messages, public key certificates and certificate revocation list(CRL) has been standardized for vehicular networks. However, timely distribution of large CRLs to vehicles should be more elaborated with low bandwidth utilization from a practical point of view. To address this concern, we propose a CRL distribution scheme using long term evolution(LTE) point-to-multicast transmission, namely the enhanced multimedia broadcast multicast service(eMBMS). The schem is much more resource efficient than the existing unicast CRL distribution schemes for vehicular networks and it allows realizing the regional CRL distribution schemes efficiently in LTE network. By means of ns-3 simulation, we analyze the performance, latency, and execution time of the scheme in terms of varying coverage of the multimedia broadcast multicast service over single frequency network (MBFSN).

Reducing of Authentication Signaling Traffic in LTE Networks (LTE 네트워크에서 인증 시그널링의 감소 기법)

  • Kim, Seonho;Jeong, Jongpil
    • KIPS Transactions on Computer and Communication Systems
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    • v.1 no.2
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    • pp.109-118
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    • 2012
  • As a result of the prevalence of smartphone, various mobile services became faster by LTE networks. Because many mobile devices are used more wireless services, heavy signaling traffic for authentication could be generated. Authentication is an important factor in wireless networks to identify devices; it is the start of wireless networks. This paper analyzes previous patterns for more effective authentication in accessing of another external networks. We propose a fast authentication scheme for minimizing of signaling cost between the authentication server and external networks. And we calculate the rate of authentication occurrence in LTE networks using mathematical modeling as well as the change of signaling cost for authentication in various network environments. Finally, we calculate the optimized number of authentication data and show the effectiveness for authentication signaling costs.

Performance Analysis of CoMP with Scheduling and Precoding Techniques in the HetNet System (이종 네트워크에서 스케줄링 및 프리코딩을 결합한 다중 포인트 협력 통신 기술의 성능 분석)

  • Kim, Bora;Moon, Sangmi;Malik, Saransh;Kim, Cheolsung;Hwang, Intae
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.8
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    • pp.45-52
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    • 2013
  • Coordinated Multi-Point (CoMP) is considered as a technology in the 3rd Generation Partnership Project(3GPP) Long Term Evolution-Advanced (LTE-A) system. In this paper, we design and analyze the performance of the Coordinated Beamforming (CB) technique, which is one major category of CoMP. We perform Monte Carlo simulations with a Heterogeneous Network (HetNet) in LTE-A, and confirm the performance through a graph of the Cumulative Distribution Function (CDF). From the simulation results, we show significant performance gain with the CoMP technique, and better performance when we apply various schemes of scheduling and precoding.

An Optimal Resource Distribution Scheme for P2P Streaming Service over Centralized DU Environment in LTE (LTE에서 집중화된 DU 환경에서 P2P 스트리밍 서비스를 위한 최적의 자원 배분 방안)

  • Kim, Yangjung;Chong, Ilyoung
    • KIPS Transactions on Computer and Communication Systems
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    • v.3 no.3
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    • pp.81-86
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    • 2014
  • According to the development of streaming services with P2P and mobile network technologies, researches to enhance the service quality in mobile environment have been proposed. However, streaming services considering high-speed mobile environment and characteristics of heterogenous terminals have been hindered from being provided with the required quality from user because of bandwidth congestion between selfish peers of existing P2P system. It is also prone to long delay and loss in accordance with the repeated traffic amounts because there are no optimized solution for traffic localization. The structure to enhance peer contribution for service differentiation and peer selection with clustering scheme with location information of terminal can satisfy both users and service providers with service quality and efficiency. In this paper, we propose an incentive mechanism and resource distribution scheme with user contribution and traffic cost information based on user location, which make mobile users increase the satisfaction of service quality in LTE environments.

A Study on Distribution Processing of eNodeB Messages in EPC System of LTE Networks (LTE/EPC시스템의 eNodeB 메시지 분산 처리에 대한 연구)

  • Choi, Wan-Kyu
    • The Journal of Korean Institute of Information Technology
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    • v.15 no.9
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    • pp.71-79
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    • 2017
  • Recently, due to the rapid explosion of smartphones, traffic trends in mobile networks are changing from voice services to packet data services. In order to corporate with such changes in mobile services, most mobile companies are completing the transition to the LTE E-UTRAN network, which is a next generation radio access network. The MME, which is one of LTE EPC nodes for providing E-UTRAN service, is a main body for processing signals of the control plane and performs functions related to data call control for mobility management, security, paging and IP connectivity. MME is designed to perform call control of many subscribers in terms of performance. So, the multi-processors constituting the MME system should be able to distribute the message and load with the eNB. This paper proposes load balancing method of a message delivering and message inter-working between eNB and MME in LTE network.

Novel User Offloading Scheme for Small Cell Enhancement in LTE-Advanced System (LTE-Advanced 시스템에서 소형셀 향상을 위한 새로운 사용자 오프로딩 기법)

  • Moon, Sangmi;Chu, Myeonghun;Lee, Jihye;Kwon, Soonho;Kim, Hanjong;Kim, Cheolsung;Hwang, Intae
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.5
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    • pp.19-24
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    • 2016
  • In Long Term Evolution-Advanced (LTE-A), small cell enhancement(SCE) has been developed as a cost-effective way of supporting exponentially increasing demand of wireless data services and satisfying the user quality of service(QoS). However, due to the dense and irregular distribution of a large number of small cells, the offloading scheme should be applied in the small cell network. In this paper, we propose an user offloading scheme for SCE in LTE-Advanced system. We divide the small cells into different clusters according to the reference signal received power(RSRP) from user equipment(UE). Within a cluster, We apply the user offloading scheme with the consideration of the number of users and interference conditions. Simulation results show that proposed scheme can improve the throughput, and spectral efficiency of small cell users. Eventually, proposed scheme can improve overall cell performance.

Performance Analysis of A Hybrid Codebook for LTE Downlink Relay Systems (LTE 하향 링크 중계기 시스템에서 새로운 하이브리드 코드북 성능 분석)

  • Kim, Hyung-Jun;Park, Noe-Yoon;Kim, Young-Ju
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.4
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    • pp.462-469
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    • 2011
  • In this paper, we propose a novel hybrid codebook design method which combines DFT matrix based codebook for Rayleigh fading and LOS codebook for direct path. Link-level performances employing hybrid codebook outperform the ones employing the conventional codebooks when K-factor of Rician distribution is 0.28 to 0.99. Moreover hybrid codebook shows good performances over not only Rayleigh channel but also high K's Rician channels.