• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2010.10a
• /
• pp.377-380
• /
• 2010

MANET(Mobile Ad-hoc Network) has been proposed as a infrastructure-less network using distributed algorithm for remote environment monitoring and control. The mobility of MANET would make the topology change frequently compared with a static network and a node is resource-constrained. Hence, to improve the routing protocol in MANET, energy efficient routing protocol is required as well as considering the mobility would be needed. In this paper, we extend RODMRP(Resilient Ontology-based Dynamic Multicast Routing Protocol) structure by a modifying the level of cluster. We call this network protocol CACH-RODMRP. Our contribution consists estimating the optimal level of clustering depth with considering node position and reducing the network residual energy. The simulation results of proposal algorithm show that the energy is significantly reduced compared with the previous clustering based routing algorithm for the MANET.

• Journal of information and communication convergence engineering
• /
• v.6 no.3
• /
• pp.255-260
• /
• 2008

In the recently years, there has been a big interest in ad hoc wireless network as they have tremendous military and commercial potential. An Ad hoc wireless network is composed of mobile computing devices that use having no fixed infrastructure of a multi-hop wireless network formed. So, the fact that limited resource could support the network of robust, simple framework and energy conserving etc. In this paper, we propose a new ad hoc multicast routing protocol for based on the ontology scheme called inference network. Ontology knowledge-based is one of the structure of context-aware. And the ontology clustering adopts a tree structure to enhance resilient against mobility and routing complexity. This proposed multicast routing protocol utilizes node locality to be improve the flexible connectivity and stable mobility on local discovery routing and flooding discovery routing. Also attempts to improve route recovery efficiency and reduce data transmissions of context-awareness. We also provide simulation results to validate the model complexity. We have developed that proposed an algorithm have design multi-hierarchy layered networks to simulate a desired system.

• The KIPS Transactions:PartC
• /
• v.15C no.4
• /
• pp.263-272
• /
• 2008

Recently, WiBro has been developed to efficiently support real-time broadcasting with wireless system. MBS (Multicast Broadcast Service) based on WiBro has numerous applications such as DMB. Since the current MBS uses only common channel managed by scheduling, it cannot effectively support many users at the same time. This paper proposes a new counting scheme with which the channel mode can be properly switched between common channel and dedicated channel. It thus allows efficient use of limited radio resource in WiBro for the MBS.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.13 no.2
• /
• pp.275-280
• /
• 2013

With rapidly growing mobile wireless services, the existing copper-based mobile backhaul technologies suffer from reaching the capacity limits. PON technologies is drawing attention as a key solution to replace the existing mobile backhaul technologies due to not only providing innovative network capacity but also cost-effective maintenance caused by the bandwidth gain from optical fibers. With a PON-based mobile backhaul, broadband wireless multimedia services such as a video conference and IPTV can be seamlessly provided. In this paper, we first introduce overview of the PON-based mobile backhaul technology. For a example of practical integration, three types of EPON-WiMAX integrated architectures are proposed and comparatively analyzed in term of costs and network performance. Then, applicable plan and anticipated effects are presented when applying network coding on the PON-based mobile backhaul to improve the performance of delivering multicast traffic.

• The KIPS Transactions:PartC
• /
• v.8C no.5
• /
• pp.637-646
• /
• 2001

The multicasting telecommunication is an important research as an applicable technique in the development of adaptable technique for modern mobile computing and mobile IP, because that is supposed to be a solution for transferring the large-size information on the mobile and wireless network with the narrow bandwidth. This paper will suggest one solution for the bidirectional tunneling and the local re-registration problems to support transferring mobile multicasting datagram by the partitioned network. The bidirectional tunneling technique is in use for mobile host moving around in a region and the local re-registration technique for crossing regions to reduce traffic load caused by transferring datagram along a long distance, and we compare those models with our suggested model by simulation.

• Journal of KIISE:Information Networking
• /
• v.27 no.4
• /
• pp.418-428
• /
• 2000

이동호스트를 지원하는 네트워크에서의 멀티캐스트 라우팅은 그룹 멤버의 빈번한 위치 변화를 가져와서 기존의 고정 호스트를 기본으로 설계된 멀티캐스트 라우팅 프로토콜을 적용할 경우 많은 문제점을 발생시킨다. 이런점에서 Mobile-IP를 유니캐스트 라우팅 방식으로 사용하는 이동환경에서의 이동호스트를 위한 몇가지 멀티캐스팅 방법이 제시되었으나 이 방법들 또한 비최적 경로로의 데이터 전송, 비효율적인 데이터 중복 전송, 그리고 빈번한 멀티캐스트 트리의 재구성으로 인한 오버헤드 등의 문제점을 가지고 있다. 따라서 본 논문에서는 이런 문제점들을 구찰하고 이 문제점들을 보와하는 효과적인 멀티캐스트 라우팅 프로토콜을 제안하고자 한다. 제시하는 프로토콜은 Mobile-IP를 사용하는 이동호스트에게 멀티캐스트 서비스를 지원하는 멀티캐스트 에이전트와 이들 멀티캐스트 에이전트들 중에서 선택된 멀티캐스트 포워더를 이용하여 동작한다 이동호스트는 이웃한 멀티캐스트 포워더로부터 데이터를 터널링받거나 또는 로컬네트워크에 위치한 멀티캐스트 라우터로부터 멀티캐스트 데이터를 직접전송받게 된다. 따라서 멀티캐스트 데이터의 전송 경로를 단축시키고 중복되는 데이터 및 터널링으로 전송되는 데이터를 감소시킴으로써 전체 네트워크 트래픽량을 줄이는 효과를 얻을 수 있다. 제시하는 프로토콜의 성능은 다양한 환경의 시뮬레이션을 통하여 확인해 본다.

• Journal of Electrical Engineering and Technology
• /
• v.9 no.6
• /
• pp.2025-2035
• /
• 2014

The read range of UHF mobile readers can be extended by a booster for mobile RFID readers (BoMR). But in an environment where multiple BoMRs are installed, the read success rate may be decreased due to signal interference. This paper proposes three arbitration methods based on interference estimation with the purpose of enhancing the read success rate. A central arbitration server manages global information in centralized arbitration method (CAM) without broadcast/multicast communication facility. In fully distributed arbitration method (FDAM), all the arbitration messages are broadcasted from a BoMR to every BoMR, and each BoMR decides with broadcasted global information. Events in FDAM are serialized naturally with broadcasted messages. Cluster Distributed Arbitration Method (CDAM) forms clusters with multicasted BoMRs and a selected BoMR acts as an arbiter in the cluster. Such effects as lengthened read range, improved the read success rates of readers can be obtained by the proposed methods without any hardware modification. In order to evaluate the arbitration methods, the RFID system is modeled by using the DEVS formalism and simulated by using the DEVSim++.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.05b
• /
• pp.1149-1152
• /
• 2003

최근 인터넷 멀티미디어 트래픽 증가 및 IP 이동성에 대한 요구의 증가로 인하여 모바일 환경에서 효율적인 멀티미디어 서비스에 대한 필요성이 증가하고 있다. 이동 사용자에게 무선단말을 통해 인터넷 방송과 같은 멀티미디어를 제공하는 서비스는 차세대 네트워크에서 보다 일반적인 서비스형태가 될 것이며 이를 위해 무선 대역폭의 효율적인 활용을 위한 멀티캐스트 기술은 현재보다 활발히 사용될 것으로 예상된다. 이와 같은 점을 고려할 때 모바일 환경에서의 효율적인 멀티캐스트 프로토콜의 개발은 필수적인 요소이며 특히 방대한 멀티캐스트의 개념을 채택하고 있는 IPv6 환경에서 더욱 중요한 의미를 갖는다 할 것이다 현재 IETF 에서 Mobile IPv4와 IPv6를 위해 두 가지 이동 멀티캐스팅 방법을 제시하고 있으나, 각 방식은 많은 개선의 여지를 보이고 있을 뿐 아니라 IPv6의 멀티캐스트 개념을 적절히 반영하지 못하고 있다. 따라서, 본 논문에서는 Mobile IPv6 환경에서 새로운 이동 멀티캐스트 스킴을 제안한다. 제안된 방법은 IETF 의 두 방식에 대한 단점을 보완함과 동시에 이동 호스트가 방문하는 포린 링크에 어떠한 추가적인 기능을 요구하지 않으며 MIPv6 설계 요구사항을 최대한 반영하므로 최소한의 수정만으로 구현 가능한 장점을 가진다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.11b
• /
• pp.883-886
• /
• 2003

호스트의 위치를 동적으로 관리해야 하는 이동 통신망 환경에서 멀티캐스트 서비스 지원을 위하여 기존 고정 통신망 환경에서 사용되는 멀티캐스트 프로토콜의 사용은 부적합하다. 이동 호스트의 이동성을 보장하기 위하여 IETF에서는 원격 가입(remote subscription)과 양방향 터널링(bidirectional tunneling)을 제안하였다. 하지만, 이 방법들 또한 경로 비최적화 문제, 멀티캐스트 트리의 빈번한 재구성 등의 문제점을 가지고 있다. 본 논문에서는 Mobile IPv4 지역 등록 기법을 이용함으로써 이동 호스트의 이동 후 등록 절차에서 나타나는 지연을 줄였다. 그리고, 멀티캐스트 트리의 빈번한 재구성을 줄이기 위해서 로컬 네트워크의 GFA(gateway foreign agent)가 실제 트리에 가입한다. 그러므로 로컬 네트워크 내의 움직임은 트리 재구성에 영향을 미치지 않도록 하였다. 또한 이동 호스트는 이전 DFA에게 멀티캐스트 데이터를 포워딩 받을 수도 있고, 현재의 GFA가 직접 멀티캐스트 트리에 가입하여 데이터를 받을 수 있다. 이러한 기법들을 사용하여 경로 비최적화 문제를 해결하고, 트리 재구성 빈도를 줄일 수 있는 방안을 제시하였다.

• International Journal of Computer Science & Network Security
• /
• v.21 no.7
• /
• pp.341-349
• /
• 2021

Many emerging mobile ad-hoc network application communications are group-oriented. Multicast supports group-oriented applications efficiently, particularly in a mobile environment that has a limited bandwidth and limited power. Energy effectiveness along with safety are 2 key problem in MANET design. Within this paper, MANET is presented with a stable, energy-efficient clustering technique. In this proposed work advanced clustering in the networks with ticket ID cluster manager (TID-CMGR) has formed in MANET. The proposed routing scheme makes secure networking the shortest route possible. In this article, we propose a Cluster manager approach based on TICKET-ID to address energy consumption issues and reduce CH workload. TID-CMGR includes two mechanism including ticket ID controller, ticketing pool, route planning and other components. The CA (cluster agent) shall control and supervise the functions of nodes and inform to TID-CMGR. The CH conducts and transfers packets to the network nodes. As the CH energy level is depleted, CA elects the corresponding node with elevated energy values, and all new and old operations are simultaneously stored by CA at this time. A simulation trial for 20 to 100 nodes was performed to show the proposed scheme performance. The suggested approach is used to do experimental work using the NS- simulator. TIDCMGR is compared with TID BRM and PSO to calculate the utility of the work proposed. The assessment shows that the proposed TICKET-ID scheme achieves 90 percent more than other current systems.