• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.4
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• pp.678-691
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• 2015

Internet and mobile traffic continues to surge exponentially in recent years due to popularization of smart devices, the appearance of various internet services carrying large amount of traffic from richer content and applications. This phenomenon leaded to various network problems such as the congestion delay, the non-balanced traffic ratio between ISPs, the continuous network investment cost and the Internet access problems. In light of changed data-driven communication ecosystem, There are growing concerns by both academia and industry that settlement-free peering and full transit regime have the limitations such as not only difficulties in maintaining mutual benefits but also difficulties in securing investment incentives for upgrading network performance and quality. Thus, it becomes more necessary for introducing the evolved internet interconnection regime which can fulfill the All-IP network environment. This study derives core issues regarding internet interconnection regime in Korea and suggest new evolved alternatives based on three point of view(traffic optimization, cost optimization, network investment optimization) through the empirical analysis.

• The KIPS Transactions:PartC
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• v.9C no.2
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• pp.267-276
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• 2002

By using wireless terminal, User that want to transmit multimedia traffic as well as simple text and voice have a tendency to increase. This paper proposes a fast handoff protocol that is suitable transmission for real-tim of multimedia traffic by using modified local registration. The proposed protocol solves the Triangle Routing Protocol that is one of existing opened issues without modifying protocol of CN, and we propose the method that MN is able to received a packet by real-time, even if MN is being handoff. We compare fast handoff protocol proposed in this paper with existing method n the registration cost and data packet transmission cost. As a result, we showed that fast handoff protocol proposed in this paper outperforms existing method.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.3
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• pp.151-161
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• 2022

As Internet traffic surges due to global CPs, a request to share network investment costs has emerged in the industry. This has significantly changed the issue of the principle of network neutrality from accessibility to network fee. Some of the academic researchers had a negative view to network fees in the Internet space. However, in the industry, a number of disputes have occurred and some have escalated into court battles, and attention has been focused on the court's decision. The courts began to accept fee-for-service under network neutrality, and the government responded quickly by revising regulations. However, it still focuses on service stability, and there is no regulation that directly stipulates payment of network fee. In the study, changes in network neutrality were verified by analyzing cases of disputes between operators, court judgments, and improvement of regulations. And referring to the tragedy of the commons, the restoration of the correct price signal based on the principle of beneficiary pays was suggested as the most important solution. The payment of network fee by CP is one of the solutions.

• Journal of IKEEE
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• v.18 no.3
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• pp.435-441
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• 2014

The V2X cooperative communication system is fusion technology which makes vehicle manuver safer. To evaluate and anticipate effect of these kind of technology, it requires real-car based road construction, implementation of communication devices, hiring inspection specialized personnel. For this reason, many laboratories and universities experience difficulties to test their technology results. Also, the need of implementing reliable testbed for testing vehicle safety applications and V2X communication technology is increasing as V2X device development is being accelerated. In this paper, we implemented a system which synchronizes traffic and network simulators via developing External interface to set simulation based testing environment in order to solve the difficulties.

• The KIPS Transactions:PartC
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• v.8C no.5
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• pp.677-682
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• 2001

In a microcell environment having frequent inter-cell movement of a subscriber, the amount of signalling traffic rapidly increases due to the treatment of location update and other necessary actions. As a way to reduce such an overhead, this paper presents an algorithm that dynamically allocates subscribers paging and location areas each of which has a different size and shape, depending on the characteristics of subscriber mobility. Mathematical analysis results show that this algorithm allows reduced area management cost, compared to conventional algorithms.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1383-1386
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• 2001

Internet 이용자의 급격한 증가와 광대역 통신망(B-ISDN) 구축의 확산에 따라 ATM(Asynchronous Transfer Mode)망 접속장치의 큰 수요가 기대되며, 또한 ATM망 접속장치의 성능 향상도 요구되고 있다. 기존의 연구들은 컴퓨터 프로그램의 메모리에 대한 참조가 지역적이라는 특성을 이용한 가상 메모리의 효율적인 페이지 교체 알고리즘 및 캐쉬 처리 방안들이 진행되어 왔다. 본 논문은 ATM 프로토콜 프로세서를 설계하는데 있어 네트워크 트래픽의 지역성(Locality of Reference)을 고려한 캐쉬 메모리 구조를 적용하여 보다 향상된 ATM 셀 수신이 가능하도록 한다. ATM 셀의 가상 패스 식별자/가상 채널 식별자(VPI/VCI)를 캐쉬 처리함으로써, 패킷을 분해, 재조립(Segmentation and Reassembly)할 때 관련 테이블의 검색 시간을 줄일 수 있다. 캐쉬 메모리 적용으로 인한 성능 향상을 평가하기 위해 ATM NIC 프로세서와 내부 캐시 메모리 그리고, 외부 SRAM 사이에 셀 수신 정보의 Read 와 Write에 드는 시간 비용(System Clock Cycle)을 캐시의 Hit 또는 Miss 등에 따라 구분하고, 이를 기반으로 한 시뮬레이터에 3 종류의 ATM 셀 스트림을 가하여 각각에 대해 평균 셀 처리시간, 데이터 버스의 트래픽 비율 그리고, 히트율의 3가지 평가요소를 측정하고, 비교하였다.

• The Journal of the Korea Contents Association
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• v.3 no.3
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• pp.63-73
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• 2003

Today, in exponential growth of internet, the importance of file caching which could reduce the sun load, the volume of network traffic, and the latency of response has emerged. Actually, in one network, the traffic has reduced by using the cache and this means that file caching can improve the internet environment by cost a fraction of link upgrades. In this paper, we address a dynamic cache group configuration policy, to solve the scalable problem. The simulation result shows that the cache group using our proposal policy reduces the latency of response time and it means that out cache group configuration is more scalable than the static cache configuration.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.9
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• pp.849-858
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• 2012

We proposed a scheme to accurately detect elephant flows. Along the ever increasing traffic trend, certain flows occupy the network heavily in terms of time and network bandwidth. These flows are called elephant flows. Elephant flows raises complicated issues to manage for Internet traffics and services. One of the methods to identify elephant flows is the Landmark LRU cache scheme, which improved the previous method of Least Recently Used scheme. We proposed a cache update algorithm, to further improve the existing Landmark LRU. The proposed scheme improves the accuracy to detect elephant flow while maintaining efficiency of Landmark LRU. We verified our algorithm by simulating on Sangmyung University's wireless real network traces and evaluated the improvement.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.3
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• pp.32-38
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• 2015

In this paper, we propose a smallcell local caching algorithm under user's context in smallcell environment. The proposed system reduces traffic to core network and the network cost, but increases it's performance. The proposed algorithm precache suitable files using smallcell's regional characteristics and target's personality. It can adjusts a storage allocation to make effective usage of our limited cache storage capacity. In order to evaluate the performance of the proposed cache algorithm, we define the cache efficiency, the decrement of core network traffic. The simulation results show that the proposed algorithm can improve performance by about 200% compared to existing web cache scheme.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.58-62
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• 2007

Recnetly, the demands of QoS(Quality of Service) and the traffic in network is increased. So, H-MPLS(Hierarchical MPLS) network research what guarantees the scalability is in progress. But, the H-MPLS has a problem of increasing of groups and the links of these group's nodes. It happens a problem that is increasing of H-MPLS setup cost. In this paper, We setup the H-MPLS groups. We use NS simulator in order to analyze the performance and traffic transfer times of each H-MPLS groups. In conclusion, we can find out the elevation of the traffic performance, by increasing a amount of links.