Earticle

Named data networking (NDN) treats content/data as a “first class citizen” of the network by giving it a “name”. This content “name” is used to retrieve any information, unlike in device-centric networks (i.e., the current Internet), which depend on physical IP addresses. Meanwhile, the smart home concept has been gaining attention in academia and industries; various low-cost embedded devices are considered that can sense, process, store, and communicate data autonomously. In this paper, we study NDN in the context of smart-home communications, discuss the preliminary evaluations, and describe the future challenges of applying NDN in smart-home applications.

In-network caching is an important feature of Information Centric Networking (ICN). All routers in ICN will maintain caching ability, and, for each request, contents are cached at routers along the delivery path. This kind of on-path caching can reduce overall retrieval time. However, the same contents may end up to be cached all over the network causing wastes of caching space and decrease content diversity. Coordinated caching policy decides which contents to be stored at which routers cooperatively for better utilizing cache space. Nevertheless, with limited storage, most of coordinated caching policies use all the caching capacity to store popular contents. It may raise a fairness issue in which unpopular contents can not access caching space and thus lower overall performance. In this paper we propose a hybrid coordinated caching algorithm. By splitting cache space into two parts running different mechanisms respectively, it provides accessibility for both popular and unpopular contents. The evaluation results show that fairness is uplifted while maintaining high hit ratio and minimized latency.

DDoS(Distributed Denial of Service) 공격은 현재의 인터넷 환경뿐만 아니라 NDN에서도 정상적인 서비스를 저해시키는 주요 문제이며 이에 관련된 다양한 연구들이 진행되고 있다. 본 논문에서는 DDoS 공격이 가해질 때 NDN 라우터의 PIT(Pending Interest Table) 가용성 저해로 인해 발생하는 문제 해결에 중점을 둔다. 이를 위한 방안으로 RED(Random Early Detection) 알고리즘을 기반으로 하는 기법을 적용하고, 시뮬레이션을 통한 측정 결과를 보여준다.