• Journal of Communications and Networks
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• 제14권5호
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• pp.554-565
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• 2012

In this paper, we study a cross-layer and end-to-end optimization problem for the integrated wireless and wireline network that consists of one wireline core network and multiple wireless access networks. We consider joint end-to-end flow control/distribution at the transport and network layers and opportunistic scheduling at the data link and physical layers. We formulate a single stochastic optimization problem and solve it by using a dual approach and a stochastic sub-gradient algorithm. The developed algorithm can be implemented in a distributed way, vertically among communication layers and horizontally among all entities in the network, clearly showing what should be done at each layer and each entity and what parameters should be exchanged between layers and between entities. Numerical results show that our cross-layer and end-to-end optimization approach provides more efficient resource allocation than the conventional layered and separated optimization approach.

• ETRI Journal
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• 제40권1호
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• pp.72-88
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• 2018

In the fifth generation (5G) era, the radio internet protocol capacity is expected to reach 20 Gb/s per sector, and ultralarge content traffic will travel across a faster wireless/wireline access network and packet core network. Moreover, the massive and mission-critical Internet of Things is the main differentiator of 5G services. These types of real-time and large-bandwidth-consuming services require a radio latency of less than 1 ms and an end-to-end latency of less than a few milliseconds. By distributing 5G core nodes closer to cell sites, the backhaul traffic volume and latency can be significantly reduced by having mobile devices download content immediately from a closer content server. In this paper, we propose a novel solution based on software-defined network and network function virtualization technologies in order to achieve agile management of 5G core network functionalities with a proof-of-concept implementation targeted for the PyeongChang Winter Olympics and describe the results of interoperability testing experiences between two core networks.

• 한국전자통신학회논문지
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• 제14권6호
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• pp.1069-1076
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• 2019

정보통신기술의 발달로 군의 무기체계가 네트워크로 연결되어 실시간으로 데이터를 주고받아 작전을 수행하는 네트워크 중심전으로 전장 환경이 크게 변하고 있는 추세이다. 네트워크 중심전의 핵심 시스템은 전술데이터 링크이며, 전술데이터링크 가입자는 유선, 무선, 위성 네트워크를 통해 실시간으로 전술정보를 주고받아 전장상황을 공유한다. 시간이 지날수록 전술데이터링크 시스템을 탑재한 군의 무기체계가 증가하고, 통신장비의 성능이 개선되는 상황에서 전술데이터링크를 통해 주고받는 데이터의 양도 증가할 수밖에 없다. 본 연구에서는 전술데이터링크의 데이터를 처리하는 데이터링크 처리기의 전술자료 송신 메커니즘을 개선하여 전술데이터링크 시스템의 전송속도 및 처리 용량을 향상시킬 수 있는 방법을 제안한다.