• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.242-245
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• 2008

Exchange System for mobile communication operator is very important for providing continuous services to customers. However traditional solution is too expensive for choosing in the real environment. In this paper, we suggest cost-effective auto backup monitoring solution, which is robust for system failure. And this suggested solution will also can be adopted to the $4^{th}$ generation of IP core network.

• Journal of Information Processing Systems
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• 제19권4호
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• pp.450-464
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• 2023

To address the problems of large system overhead and low timeliness when dealing with task scheduling in mobile edge cloud computing, a task scheduling and resource management strategy for edge cloud computing based on an improved genetic algorithm was proposed. First, a user task scheduling system model based on edge cloud computing was constructed using the Shannon theorem, including calculation, communication, and network models. In addition, a multi-objective optimization model, including delay and energy consumption, was constructed to minimize the sum of two weights. Finally, the selection, crossover, and mutation operations of the genetic algorithm were improved using the best reservation selection algorithm and normal distribution crossover operator. Furthermore, an improved legacy algorithm was selected to deal with the multi-objective problem and acquire the optimal solution, that is, the best computing task scheduling scheme. The experimental analysis of the proposed strategy based on the MATLAB simulation platform shows that its energy loss does not exceed 50 J, and the time delay is 23.2 ms, which are better than those of other comparison strategies.

• 정보처리학회논문지C
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• 제10C권1호
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• pp.111-118
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• 2003

정보화 시대가 도래하면서 통신망의 장애에 의한 서비스 단절은 사회 각 분야에 치명적인 영향을 끼치게 된다. 통신망 장애에 의한 피해를 계량적으로 평가할 때 서비스를 이용하는 가입자 측면에서 살펴보면 얼마나 많은 장비가 장애에 의해 피해를 입었는가 하는 것보다는 얼마나 많은 가입자가 얼마나 오랫동안 서비스를 이용하지 못하였는지가 더 중요할 것이다. 따라서, 본 논문에서는 국내 무선통신망의 장애발생시 가입자에 대한 충격정도를 정량적으로 산출하여 장애영향을 평가할 수 있는 장애영향 평가 모델에 대하여 제안하였다. 이때, 국내 무선통신망 환경에 적합한 장애영향 평가 모델을 제안하기 위하여 국내 무선통신망의 가입자수, 무선서비스 유형별 중요도에 따른 가중치를 고려하였고 장애에 의해 영향 받은 가입자수를 계량화하는 크기 비중 값 계산식을 개발, 적용하였다. 장애영향 평가 모델의 적용결과를 살펴보면 PCS 네트워크에서 30,000명의 가입자가 30분 동안 "Mobile to Land" 서비스를 제공받지 못했을 경우 장애지수는 2.5로서 10,000명의 가입자가 서비스를 제공받지 못한 경우의 0.5 보다 5배 정도 가입자에게 충격을 주는 것으로 나타났으며, 30,000명의 가입자가 30분 동안 "Mobile to Land" 및 "Local Mobile to Mobile"의 서비스를 동시에 제공받지 못했을 경우는 3.75 이었다.비스를 동시에 제공받지 못했을 경우는 3.75 이었다.

• 한국통신학회논문지
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• 제36권4A호
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• pp.380-387
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• 2011

While mobile IPTV services are supported through the mobile WiMAX networks, there must need some guaranteed bandwidth for the IPTV services especially if IPTV and non-IPTV services are simultaneously supported by the mobile WiMAX networks. The quality of an IPTV service definitely depends on the allocated bandwidth for that channel. However, due to the high quality IPTV services and to support of huge non-IPTV traffic over mobile WiMAX networks, it is not possible to guarantee the sufficient amount of the limited mobile WiMAX bandwidth for the mobile IPTV services every time. A Service Level Agreement (SLA) between the mobile IPTV service provider and mobile WiMAX network operator to reserve sufficient bandwidth for the IPTV calls can increase the satisfaction level of the mobile IPTV users. In this paper, we propose a SLA negotiation procedure for mobile IPTV users over mobile WiMAX networks. The Bandwidth Broker controls the allocated bandwidth for IPTV and non-IPTV users. The proposed dynamically reserved bandwidth for the IPTV services increases the IPTV user's satisfaction level. The simulation results state that, our proposed scheme is able to provide better user satisfaction level for the IPTV users.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2006년도 하계학술대회
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• pp.47-52
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• 2006

In this paper, we suggested new network architecture to provide seamless service between the cellular system and new wireless broadband network such as IEEE 802.16e, called WiBro. The interworking technologies are very important issue because mobile operator should provide service connectivity between various wireless networks based on different access technologies. Moreover a change and modification on legacy network should be minimized for providing interworking with new wireless broad-band network. We implemented proposed interworking architecture between 3G cellular network and 802.16e network to provide seamless service including interworking unit in real test environment. Also, we performed performance evaluation in hybrid network environments.

• 제어로봇시스템학회논문지
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• 제11권12호
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• pp.977-983
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• 2005

In this paper, novel ubiquitous concept of real reality robot game controlled by a mobile server robot is proposed. Real reality robot game means that two real robots controlled by humans/computers through the internet are playing a boxing game. The mobile server robot captures playing images of the boxing game and sends them to GUI on the screen of human operators' PC. The human operator can login to the boxing game from any computer in any place if he/she is permitted. Remote control of a boxing robot by a motion capture system through network is implemented. Successful motion control of a boxing robot remotely controlled by a motion capture system through network can be achieved. In addition, real boxing games between a human and a computer are demonstrated.

• 전자통신동향분석
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• 제16권2호통권68호
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• pp.63-72
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• 2001

이동전화시장에 경쟁된 이후 국내 이동전화시장은 사업자간의 치열한 경쟁으로 인해 보급률이 58%에 달하는 등 급격한 성장을 이룩하여 왔다. 그러나 이러한 외형적인 성장에 비추어 이용자 입장에서의 경쟁 활성화 효과는 극히 미미한 실정이다. 오히려 이동전화서비스에 대한 소비자들의 불만이 갈수록 높아지고 있는 것으로 나타났다. 이러한 문제의 근본 원인은 이동망을 운영하고 있는 사업자들이 일단 가입자가 확보되면 확보된 가입자에게는 거의 독점적인 권한을 행사할 수 있는 시장구조에서 비롯되고 있다. 본 고에서는 이러한 이동망의 배타적 사용문제를 해결하고 경쟁을 활성화하기 위한 수단으로써 가상이동망사업자(Mobile Virtual Network Operator: MVNO) 제도를 검토하고 그 구체적 운영방안을 외국사례를 중심으로 살펴보고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권12호
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• pp.3133-3151
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• 2012

The optimal price strategy selection of two bounded rational cognitive mobile virtual network operators (MVNOs) in a duopoly spectrum sharing market is investigated. The bounded rational operators dynamically compete to sell the leased spectrum to secondary users in order to maximize their profits. Meanwhile, the secondary users' heterogeneous preferences to rate and price are taken into consideration. The evolutionary game theory (EGT) is employed to model the dynamic price strategy selection of the MVNOs taking into account the response of the secondary users. The behavior dynamics and the evolutionary stable strategy (ESS) of the operators are derived via replicated dynamics. Furthermore, a reward and punishment mechanism is developed to optimize the performance of the operators. Numerical results show that the proposed evolutionary algorithm is convergent to the ESS, and the incentive mechanism increases the profits of the operators. It may provide some insight about the optimal price strategy selection for MVNOs in the next generation cognitive wireless networks.

• ETRI Journal
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• 제19권3호
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• pp.141-168
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• 1997

The base station (BS) in the CDMA Mobile System (CMS) connects calls through the radio interface and is designed to provide mobile subscribers with high quality service in spite of mobile subscribers motions. The BS consists of multiple base station transceiver subsystems (BTSs), a base station controller (BSC) and a base station manager (BSM). This paper is concerned with the BSC and the BSM. The BSC is located between the BTSs and the mobile switching center (MSC) connected with the public network, and to mobile subscribers via the BTSs. The BSM provides operator-interfaces per the BS and takes responsibility of operation and maintenance (OAM) of the BS. Design of the BSC is based on two module types: functional module and unit module. The functional module is used to support new services easily and the unit module to increase the system capacity economically. Both modular types are easily achieved by inserting the corresponding modules to the system. Particularly, in order to efficiently support the soft handover which is one of CDMA superior advantages, the BSC adopts a large high-speed Packet switch connecting up to 512 BTSs, and thus mobile subscribers can be provided with soft handover in high probability. The BSM is based on a commercial workstation to support OAM functions efficiently and guarantee high reliability of the functions. The BSM uses graphical user interface (GUI) for efficient OAM functions of the BS.

• 한국IT서비스학회지
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• 제15권1호
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• pp.81-96
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• 2016

This study analyzes how breach fee under long-term contract and/or cap regulation on the breach fee can affect the impacts of "Mobile Device Distribution Improvement Act" on handset bundle price, average revenue per unit (ARPU), and social welfare. We conduct comparative analysis with an economic model of duopoly competition in price when users are under long-term contract and the breach fee can be regulated. The results show that the Act lowers the equilibrium prices, lower than incumbent price without the Act. Price of non-dominant Mobile Network Operator (MNO) can be lower than poaching price without the Act if significant portion of switching cost is breach fee or the market is significantly asymmetric. Under the significant circumstances, the Act can raise ARPU even though it improves social welfare. By contrast, the Act increases consumer surplus without affecting social welfare if breach fee is the only source of user's switching cost and is capped by the regulation, and more symmetric market and the stronger cap leads to higher consumer surplus.