• IE interfaces
• /
• v.20 no.4
• /
• pp.427-437
• /
• 2007

As increasing the Internet traffic, many researches on access network are reported for end-to-end highspeed broadband network, where E-PON (Ethernet-Passive Optical Network) is one of reasonable candidates for the network with respect to cost and bandwidth utilization. For the high-speed access network, E-PON needs an efficient bandwidth allocation method. This paper describes a WFBA (Water-Filling Bandwidth Allocation) algorithm for the efficient bandwidth allocation with various simulation test. Based upon the simulation test, we suggest several ways to improve performance of E-PON.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2005.10a
• /
• pp.361-364
• /
• 2005

As increasing the Internet traffic, many researches on access network are reported for end-to-end high-speed broadband network, where E-PON(Ethernet-Passive Active Network) is one of reasonable candidate fur the network with respect to cost and bandwidth utilization. For the high-speed access network, E-PON need an efficient bandwidth allocation method. This paper suggests a WFA(Water-Filling Allocation) algorithm for the efficient bandwidth allocation with various simulation test.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.11 no.1
• /
• pp.199-204
• /
• 2011

This paper evaluates on the feasibility of MIL-STD-188-220 protocol as a medium access protocol over WNW(Wideband Network Waveform) by simulating and comparing with IEEE 802.11e-based protocol. WNW is newly designed waveform for next-generation broadband tactical communication system. This paper shows the feasibility of using the MIL-STD-188-220 protocol that shows better performance than IEEE 802.11e-based protocol on the particular environment.

• Proceedings of the IEEK Conference
• /
• 1998.10a
• /
• pp.11-14
• /
• 1998

Recently, the users of internet are increasing yearly with the rapid spread of internet. So, the shortage of IPv4 address is important issue to ISP. Many ISP is searching for efficient method to use IP address in ATM Network. Korea Telecom has constructed ATM Network test-bed to verify available technologies necessary for ATM Network. This paper, concerning with the configuration of subscribers in ATM Network test bed, analyze the available usage of IP address.

• Journal of Internet Computing and Services
• /
• v.21 no.5
• /
• pp.9-20
• /
• 2020

This study redefines the networks' connection behaviors and the terms confusion over the settlement in Netflix-SK Broadband's dispute through domestic and foreign legal references. Conflict parties, academics and the media use the terms "interconnection fee" or "Access fee" without uniformity, and in some cases mixes for strategic purposes. The use of different terms for the same phenomenon (or vice versa) has a high need for research in that it makes it difficult to reach a unified approach to the problem, to discuss it productively and rationally, and, moreover, to resolve disputes. Therefore, this study cross-referenced/analyzed terms related to network utilization and connectivity, namely "Use", "Access", "Interconnection" and thus cost-related terms as a counter-pay. In addition, it suggests that interconnection fees and access fees should be used separately, and allows them to function as a starting point in resolving future ICT sector issues. As a result of this study, the price against the network access/use between Netflix and SK Broadband is access fee or retail price, and proposes to be used uniformly in the term "interconnection fee" only for fees incurred in interconnection between ISPs that possess or operate networks.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.4C
• /
• pp.461-471
• /
• 2004

Recently, subscribers have strong desire to get QoS based personalized services in high-speed Internet access. Service providers have been rapidly replacing ADSL, cable broadband access networks with Metro-Ethernet based VDSL. But, it is difficult for Motto-Ethernet based broadband access networks to provide QoS based personalized services, because already deployed network elements cannot distinguish subscribers by specific traffic characteristics. In this paper, when the access network has tree topology, we show that it is possible to provide QoS for each downstream flow with only per flow traffic shaping at the edge node without QoS functions in access networks. In order to show that our suggested scheduling algorithm at the edge node can support the assured service in tree topology access networks, we evaluated its performance by simulation. The suggested scheduling algorithm can shape per-flow traffic based on the maximum bandwidth, and guarantees minimum bandwidth per flow by modifying the DRR scheduler. Simulation results show that congestion and loss in the access network elements are greatly reduced, TCP performance is highly enhanced and loss for assured CBR service flows is reduced by only shaping per-flow traffic at the edge node using our proposed scheduling algorithm.

• Information and Communications Magazine
• /
• v.15 no.11
• /
• pp.124-142
• /
• 1998

ETSI BRAN (Broadband Radio Access Network)는 고속 무선 LAN 또는 고정 광대역 무선액세스 네트워크에서의 무선 접촉 계층과 ATM 및 IP(Internet Protocol) 코어 네트워크와의 연동을 위한 일부 기능을 표준화하기 위한 과제이다. 특히, BRAN의 HIPERLAN type-2(HIPERLAN/2)의 경우에는 과제의 범위는 무선 접속면, 무선 부시스템에서의 서비스 인터페이스, 서비스 구현에서 요구되는 연동 및 각종 지원 기능을 표준화하며, 무선 접속면의 경우에는 다수 벤더간의 상호 호환성을 제공할 수 있는 인터페이스를 구현하는 것이다. HIPERLAN/2의 기술 규격은 코어 네트워크와 독립적인 물리계층 및 데이터 링크 제어 (DATA Link Control: DLC) 계층과 서로 상이한 코어 네트워크와의 연동을 위한 네트워크 수렴 부계층을 다루게 될 것이며, 초기 단계에서는 ATM과 IP 코어 네트워크와의 연동 기능을 제시하게 될 것이다. 따라서 HIPERLAN/2기반의 시스템 규격을 제시하기 위해서는 네트워크 계층 및 기타 상위 계층에 대한 규격이 요규되며, 이는 ATM Forum에서의 무선 ATM 신호 방식 규격, IETF(Internet Engineering Task Force)의 IP규격, 그리고 ETSI의 SMG (Special Mobile Group) 프로젝트에서 표준화되고 있는 UMTS (Universal Mobile Telecommunication Service) 규격 등과 접목될 것이다. 결과적으로 무선 ATM 관점에서는 완전한 시스템 규격 작성은 ETSI BRAN과 ATM Forum에서 무선 접속 규격과 이동성 관리 및 신호 방식으로 각각 이원화되어 진행되고 있다. 현재 물리 계층에서의 전송 방식은 OFDM(Orthogonal Frequency Division Multiplexing)으로 확정되었으며, DLC 계층에서는 고정 길이의 TDD (Time Division Duplexing) TDMA 프레임 구조를 기반으로 AP (Access Point)에 의해 동적으로 상향 링크 자원을 예약 할당하는 매체 접근 제어 (Medium Access Control: MAC) 프로토콜이 고려되고 있다. 이와 같은 DLC 계층에서는 기본적으로 짧은 길이의 패킷을 통해 다양한 대역폭의 멀티미디어 트래픽을 효율적으로 수용하면서 ATM 네트워크뿐만 아니라 향후 IP 네트워크에서 요구하는 각 서비스별 QoS (Quality of Service)를 개별적으로 보장할 수 있는 기능을 구현하고자 한다. 향후 이 부문에 대한 표준화가 본격적으로 진행될 것으로 예상되며 HIPERLAN/2의 경우에는 1999년 중반까지 1차 기능 규격을 완료할 예정이며, BRAN 전반에 대한 완전한 규격을 2002년까지 완성하는 것을 목표로 하고 있다.

• Asia Pacific Journal of Business Review
• /
• v.1 no.1
• /
• pp.67-88
• /
• 2016

This study aims to help address concerns about the growing demand of wider bandwidth Internet connection in the Philippines. Using articles and research of international organizations and content from official websites of the Philippine government, this paper has carefully examined the slow Internet connectivity and the high cost that the end-users pay for it. This paper suggests that this inefficiency hampers the motivation of users to innovate in a way that could contribute to inclusive growth and the development of an inclusive information society. Through a comparison of the current global ICT situation with the current situation in the Philippines, this paper shows that the country's Internet infrastructure lags behind among those of contemporary developing countries in Asia, particularly in terms of Internet connectivity. In 2015, Thailand had an average Internet speed of 7.4 Mbps, Sri Lanka 7.4, and Malaysia 4.3. Meanwhile, the Philippines had a meager average Internet speed of 2.8 Mbps, placing the country at 104 among 160 countries, with developed countries in Asia such as South Korea (23.6 Mbps) and Singapore (12.9 Mbps) ranking 1 and 12, respectively. Findings show that the lack of competition in the Internet connectivity market, among other reasons, is at the root of the dilemma of slow and costly Internet connection. Assessing the accomplishments of the Republic of Korea and other broadband-leading countries has provided practical insights and recommendations that can promote competitiveness. Furthermore, related literature argues how ISP practices may affect Internet speed and cost. This study offers an approach in improving Internet connectivity in the Philippines by bridging the gap between the Internet infrastructure market and government policies.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.7 no.2
• /
• pp.386-404
• /
• 2013

In broadband satellite multimedia (BSM) system, burst time plan (BTP) is always periodically generated. We find that this method can have a great effect on the system response ability to bandwidth requests. A general analysis model of BTP generation method is given. An optimized BTP generation (O-BTPG) method is presented by deducing the optimal bandwidth allocation period (BAP) and bandwidth allocation latency (BAL) without considering the signaling overhead caused by BTP. Then a novel asynchronous BTP generation (A-BTPG) method in which the BTP is generated asynchronously according to the traffic load from users' bandwidth requests is proposed. Simulation results show that A-BTPG can flexibly realize a trade-off between the system response ability and BTP signaling overhead. What's more, it can be widely used in various regenerative onboard switching BSM systems.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.14 no.10
• /
• pp.2247-2253
• /
• 2010

WiBro(Wireless Broadband Internet) is the standard of high-speed portable internet based on OFDMA/TDD (Orthogonal frequency division multiple access / Time division duplexing) techniques, and the subset of consolidated version of IEEE802.16e Wireless MAN standard. In this paper, we propose performance improvements of WiBro system using the LVQ(Learning Vector Quantization) blind equalization. Proposed method used the prefiltering LVQ neural network blind equalization in the Broadband WiBro system receiver. The prefiltering LVQ neural network constellates 16QAM that is transmitter data shape and the blind equalization removes ICI(Inter Carrier Interference). To verificate the proposed method usability, the MSE(Mean Square Error) and the BER(Bit Error Rate) are simulated. The simulation results shown that is improved the performances of the proposed WiBro system using the LVQ blind equalization than the existing WiBro system.