• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.12B
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• pp.719-727
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• 2007

The Wireless Mesh Network technology is able to provide an infrastructure for isolated islands, in which it is difficult to install cables or wide area such as battlefield of armed forces. Therefore, Wireless Mesh Network is frequently used to satisfy needs for internet connection and active studies and research on them are in progress However, as a result of increase in number of hops under hop-by-hop communication environment has caused a significant decrease in throughput and an increase in delay. Considering the heavy traffic of real-time data, such as voice or moving pictures to adaptive WMN, in a military environment, it is restricted for remote units to have their Mesh Node to get real-time services. Such phenomenon might cause an issue in fairness. In order to resolve this issue, the Location-based Packet Scheduling Scheme, which can provide an fair QoS to each mesh node that is connected to each echelon's AP and operates based on WRR method that gives a priority to emergency message and control packet. The performance of this scheme is validated.

• 한국정보통신설비학회:학술대회논문집
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• 2004.08a
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• pp.90-94
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• 2004

본 고에서는 지금까지의 통신 서비스의 주류를 형성했던 접속 중심의 서비스가 한계상황에 도달함에 따라 사업자 또는 네트워크 장비측면에서 그 대안으로 부각되고 있는 응용 및 솔루션 기반의 멀티서비스를 제공하기 위한 액세스네트워크 차원의 구축 방안을 살펴보고자 한다. 즉, 지금까지의 액세스네트워크는 음성 서비스면 음성 서비스에 적합하게, 데이터 서비스면 데이터 서비스에 적합한 구도로 구축되어 왔지만 향후에는 멀티서비스를 효과적으로 처리하기 위해 망 구조를 단순화하고 트래픽을 집선하며 가입자에 대한 인증 및 개별 과금 등과 연계될 수 있도록 하며, 서비스에 따라 QoS 및 라우팅할 수 있는 기능이 요구된다. 이러한 요구사항을 제공할 수 있는 방안으로 기존 네트워크 상에 별도 시스템을 통해 구축하는 방안과 시스템 내부 기능을 통해 구축하는 방안의 두 가지를 비교하고 향후의 바람직한 구축 방향을 살펴보고자 한다. 본 고의 구성은 다음과 같다. 2장에서는 현재 국내 액세스네트워크의 구축 연혁 및 구조를, 3장에서는 멀티서비스 중심의 서비스 체계로의 전환의 당위성과 멀티서비스를 제공하기 위한 요구사항, 기능을 구체화하고 현재 및 신규 액세스네트워크를 위한 구조를 비교한다. 그리고 마지막 4장에서는 바람직한 액세스네트워크의 구조의 방향을 제안하고 결론을 맺는다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.39 no.7
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• pp.22-29
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• 2002

The Gauranteed Frame Rate service category was proposed by the ATM Forum as an enhancement to the UBR service. This service aims to support minimum cell rate gaurantee for each virtual connection and allow any excess bandwidth in the network to be shared among the contending VCs in a fair manner. We propose a new buffer management algorithm for GFR service through FIFO queuing discipline. Proposed scheme can provide minimum bandwidth guarantee for GFR VCs as well as improve the fairness among the competing GFR VCs on a single FIFO queue. From simulation results, we demonstrate the proposed scheme fulfills the requirement of GFR service as well as improves the TCP throughput.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.3
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• pp.22-33
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• 2014

As a standard of WMNs, IEEE 802.11s supports two kinds of MAC algorithm: a mandatory EDCA used by IEEE 802.11e and an optional MCCA. While EDCA classifies traffic according to four Access Categories (AC) and offer differentiated service using a classified priority, MCCA can guarantee the specific bandwidth of users with a TDMA-style bandwidth reservation scheme between mesh routers. In case that a flow is VBR traffic of a multimedia application, MCCA has disadvantage that the reserved bandwidth does not be used entirely, though it guarantees required bandwidth of users and fairness using bandwidth reservation with neighbors' node. In this paper, we showed a problem that is wastes the reserved bandwidth when MCCA is enabled and proposed a new scheduling algorithm to prevent waste of bandwidth and to improve network utilization effectively, named Resource Sharing Round Robin (RSRR) scheduling. Finally we showed simulation results that performance of a proposed RSRR is better than the legacy MCCA through NS-2 simulation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.145-148
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• 2003

MPLS is one of the most important technics for the growth of the next generation network. MPLS is a kind of third layers switching technics which is combined with second layers switching speed and third layers routing ability. And a simple label switching paradigm which uses short and fired lengths of lables is available in MPLS, too. Like this way, MPLS not only can keep its competitive price but also keep its merits such as second layers speed, third layers expansion, and compatibility with existing protocols. That means the traffic engineering, VPN, QoS ran be supported easily in MPLS. In this thesis, therefore, we will implement a small inter-networking based on MPLS and analyze its performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.1C
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• pp.76-88
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• 2012

Traffic classification for application services in military communication networks is one of the core requirements to provide efficient resource management for NCW operations. Though several standards and organizations provided their own traffic classification methods, the methods have been mainly focused on commercial services, but not reflected military specifics. In addition, though various military application services have been emerged, some of those services have been classified into different traffic classes due to implicit criteria for the classification among organizations. In this paper, we propose a methodology to classify traffic classes and to determine delivery requirements for military application services based on various standards by DoD as well as several commercial standards based on Y.1541. The validation of the proposed methodology was carried out by comparing the results by proposed one with the traffic classification suggestions by existing commercial standards, DoD and FCS. We expect that the proposed methodology can contribute to achieve efficient operations of limited military network resources, since the proposed method can provide systematic and consistent way to assign traffic classes for new and existing military applications services.

• Journal of Korea Multimedia Society
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• v.11 no.7
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• pp.966-976
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• 2008

Providing Quality-of-Service(QoS) guarantee requires the reservation of resource needed to accommodate the traffic flow of service for which resource reservation protocol(RSVP) was introduced. However, if any RSVP-capable router on the path fails to accommodate the traffic flow due to lack of resource, the flow is not allowed no matter how much surplus resources other routers on the path have. In order to solve this problem, this paper proposes a resource reservation method that can adjust adaptively the delay budget of traffic flow allocated to each RSVP-capable router in which the router uses the recently developed general-time fair queuing scheduler. The results of the simulation applying the proposed method to an evaluation network show that it may yield the gain of up to 90% compared to that in the original one in terms of the number of admitted flows.

• Journal of KIISE:Information Networking
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• v.31 no.1
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• pp.70-80
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• 2004

In order to reduce the increasing packet loss rates caused by an exponential increase in network traffic, the IETF(Internet Engineering Task Force) is considering the deployment of active queue management techniques such as RED(Random Early Detection). But, RED configuration has been a problem since its first proposal. This problem is that proposed configuration is only good for the particular traffic conditions studied, but may have detrimental effects if used in other conditions. While active queue management in routers and gateways can potentially reduce packet loss rates in the Internet, this paper has demonstrated the inherent weakness of current techniques and shows that they are unstable for tile various traffic conditions. The inherent problem with these queue management algorithms is that they all use static parameter setting. In this paper, in order to solve this problem, a new active queue management algorithm called SQM(Stabilized Queue Management) is proposed. This paper shows that it is easy to parameterize SQM algorithm to perform well under different congestion scenarios. This algorithm can effectively reduce packet loss while maintaining high link utilizations and is good for the various traffic conditions.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.2
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• pp.1-7
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• 2019

Recently, multimedia streaming service has been activated, and the demand for high-quality multimedia convergence contents services is predicted to increase significantly in the future. The issues of the increasing network load due to the rise of multimedia streaming traffic must be addressed in order to provide QoS guaranteed services. To do this, an efficient network resource management and mobility support technologies are needed through seamless mobility support for heterogeneous networks. Therefore, in this paper, an MIH technology was used to recognize the network situation information in advance and reduce packet loss due to handover delays, and an ACLMIH-FHPMIPv6 is designed that can provide an intelligent interface through introducing a hierarchical mobility management technique in FPMIPv6 integrated network.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.26 no.4
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• pp.51-54
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• 2015

많은 무선 스마트 단말의 보급으로 무선 데이터 트래픽이 폭발적으로 증가해 왔고, 이로 인한 주파수 자원의 부족은 피할 수 없는 문제가 되었다. 본 과제에서는 획득한 인지정보를 기반으로 하여 다중 라디오 환경에서 주파수 스펙트럼 감지, 동적 스펙트럼 할당, 다중 라디오 선택 및 다중화, 최적 자원 할당, 적응형 전송 기술을 개발하였고, 이 기술들의 개발로 추가적인 주파수 사용 없이 주파수 사용 효율을 최대화함으로써 네트워크 성능 향상을 이끌어 내었다. 본 기술은 고유 주파수 대역 접속, 공통 주파수 대역 접속, 고유/공통 주파수 대역 동시 접속의 경우로 나누어 개발되었다. 개발된 기술은 사용자의 QoS(Quality of Service)를 만족하는 동시에 네트워크 성능 향상을 이끌어낼 수 있음을 모의실험을 통해 검증하였다. 따라서 본 연구의 결과는 4G뿐만 아니라, 5G에서 핵심적인 기술 개발의 중요한 역할을 담당할 것이며, 앞으로도 추가적인 연구가 필요하다.