• Title/Summary/Keyword: 다중-홉 무선 네트워크

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Clustering Algorithm for a Traffic Control of Wireless Ad Hoc Networks multi-hop (무선 에드혹 망 다중홉 트래픽제어를 위한 Clustering 알고리즘에 관한 연구)

  • 이동철;김기문;김동일
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.7 no.6
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    • pp.1161-1167
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    • 2003
  • The nodes of Ad hoc network are made up of location registration for sending informations and a great number of packet transmissions to maintain routing route among the nodes. Under this environment, a huge number of traffics would be generated as mobility variable occurs more than in physical network. Hence, in this paper, focused on to study the relationship of nodes to analyze the extent of the traffic in order to control the traffics of the multi-hop in Ad hoc.

A Novel Geographical Routing Protocol for Multi-Rate Mobile Ad Hoc Networks (다중전송률 지원 이동 Ad Hoc 네트워크를 위한 위치 정보 기반 라우팅 프로토콜)

  • Hwang Jee-Na;Ko Young-Bae
    • Proceedings of the Korean Information Science Society Conference
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    • 2006.06d
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    • pp.109-111
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    • 2006
  • 이동 Ad Hoc 네트워크(MANET)에서 많은 영역에 걸쳐 다양한 라우팅 프로토콜들이 제안되어 왔다. 다중전송률은 현재 많은 무선 랜 카드에 의해 지원되고 있고, 그 효과에 관한 라우팅 프로토콜 알고리즘들이 연구되고 있다. 다중전송률에서의 high-rate을 이용한 데이터 전송은 일정한 시간 내에 더 많은 데이터를 전송할 수 있기 때문에 높은 throughput을 기대 할 수 있다. 그러나 high-rate을 이용한 데이터 전송의 경우 전송이 가능한 거리가 짧아져 목적노드까지 도달하는 데에 더 많은 홉을 거쳐야 한다. 그로 인해 패킷을 전달하는데 걸리는 시간이 늘어나 전교 네트워크의 성능을 저하시킬 수도 있다. 본 논문에서는 노드들의 이동으로 인한 네트워크의 토폴로지 변화나 채널의 상태에 따라 어떤 전송 속도로 데이터를 전송할 것인가를 결정하기 위해 다중전송률을 고려한 위치 정보 기반의 라우팅 프로토콜을 제안한다.

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Interference-Free Multipath Routing Protocol for M2M Wireless Network to Enhance Packet Delay Performance (M2M 무선 네트워크에서 패킷 지연 성능 향상을 위한 간섭 회피 다중 경로 라우팅 기법)

  • Heo, Hyeong-Min;Hwang, Jun-Ho;Yoo, Myung-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.12B
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    • pp.1259-1266
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    • 2010
  • M2M communication is considered as a key enabling technology to monitor the status of objects, vehicles, humans through auto-configuring wireless networks. In M2M network, there are active research activities to enhance the reliability on data while being collected from wireless sensor network. The reliability issue becomes more important as wireless sensor networks carry multimedia data, which is delay sensitive. The interference caused by the adjacent neighbor sensor nodes is a major factor in network performance degradation, which becomes more severe in multi-hop routing environment. In this paper, we propose inerfernce-free multipath routing protocol for M2M wireless network for enhancement of packet delay performance. The simulation results show that the proposed routing algorithm outperforms the existing routing protocols in terms of packet delay and throughput.

Analysis of Power-Saving Protocols through Beacon Interval in Multi-hop Ad Hoc Networks based on IEEE 802.11 (IEEE 802.11기반 다중 홉 Ad Hoc 망에서 Beacon 간격에 따른 Power-Saving 프로토콜의 성능분석)

  • 김동일;김동현
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2003.10a
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    • pp.141-144
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    • 2003
  • The mobile radio networks can be divided into networks that has the base station or the infrastructures like AP(Access Point) and Ad Hoc network that hasn't any infrastructures. As there aren't any fixed infrastructures in Ad Hoc Networks, mobile nodes should transmit the data only among mobile nodes themselves. To supplement these weakpoints of the two networks, many studies about Ad Hocs based on the 802.11 are in progress. In this thesis, we try to propose the efficiency of the suggested protocols by comparing and analyzing power saving protocols according to the Beacon intervals in multi hop Ad Hoc Networks based on IEEE 802.11.

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Analysis of Power-Saving Protocols through Beacon Interval in Multi-hop Ad Hoc Networks based on IEEE 802.11 (IEEE 802.11기반 다중 홉 Ad Hoc 망에서 Beacon 간격에 따른 Power-Saving 프로토콜의 성능분석)

  • 김동일;김동현
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.7 no.7
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    • pp.1415-1420
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    • 2003
  • The mobile radio networks can be divided into networks that has the base station or the infrastructures like AP(Access Point) and Ad Hoc network that hasn't any infrastructures. As there aren't any fixed infrastructures in Ad Hoc Networks, mobile nodes should transmit the data oかy among mobile nodes themselves. To supplement these weakpoints of the two networks, many studies about Ad Hon based on the 802.11 are in progress. In this thesis, we try to propose the efficiency of the suggested protocols by comparing and analyzing power saving protocols according to the Beacon intervals in multi hop Ad Hoc Networks based on IEEE 802.11.

Throughput Capacity of a Wireless Multi-hop Relay Network using Cognitive Radio (Cognitive Radio 무선 다중홉 릴레이 네트워크의 Throughput 용량)

  • Hassan, Md. Imrul;Song, Ju-Bin;Kim, Young-Il
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.5
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    • pp.33-39
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    • 2007
  • In this paper, we investigate the throughput capacity of a multi-hop relay with cognitive radio (CR) enabled relay stations (RS). We suggest a TDMA/FDMA based frame structure where RSs dynamically select unused channels to communicate with the base station (BS) using CR techniques to analyze the throughput capacity. We develop the throughput capacity model for the proposed system based on utilization factor. The analytical results based on those equations show significant improvement in throughput capacity for CR enabled multi-hop relay system.

A Robust Disjoint Multipath Scheme based on Geographic Routing in Irregular Wireless Sensor Networks (불규칙적 무선센서네트워크에 강한 위치기반 다중경로 제공 방안)

  • Kim, Sung-Hwi;Park, Ho-Sung;Lee, Jeong-Cheol;Oh, Seung-Min;Kim, Sang-Ha
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.1B
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    • pp.21-30
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    • 2012
  • Sensor networks are composed of a great number of sensor nodes with constrained battery. Disjoint multipath scheme based flooding method has a merit that efficiently construct multipath in irregular networks, but causes lots of energy consumption in networks. Flooding method is not a suitable technology in wireless sensor networks with constrained battery. We introduce energy-efficient geographic routing scheme considered as an efficient, simple, and scalable routing protocol for wireless sensor networks. The geographic routing scheme on multipath generates a problem with a congestion. So we introduce the concept of multipath pipeline as a congestion avoidance strategy. But multipath pipelines have a big problem on the boundary of holes under irregular networks. We propose a novel disjoint multipath scheme as combined method with geographic routing scheme and hole detouring algorithm on multipath. A novel disjoint multipath scheme constructs disjoint multipath pipelines efficiently for reliability without a collision in irregular wireless sensor networks. Simulation results are provided to validate the claims.

Centralized Downlink Scheduling using Directional Antennas in IEEE 802.16 based Wireless Mesh Networks (IEEE 802.16 기반의 무선 메쉬 네트워크에서 지향성 안테나를 사용하는 중앙 집중형 하향링크 스케줄링)

  • Lee, Sang-Joon;Lee, Hyong-Woo;Cho, Choong-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.2A
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    • pp.134-141
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    • 2010
  • In this paper, we propose a scheduling algorithm to improve the performance of IEEE 802.16 based wireless mesh networks using directional antenna. The performance is presented in terms of throughput of system and delay between each node by varying number of users. The result show that proposed scheduling algorithm improving the performance by reducing the delay of mesh network system. Our work may be useful as a guideline to control the fairness between SSs for multi-hop systems such as multi-hop relay and mesh networks.

A Multi-Channel Scheduling MAC (MCS-MAC) Protocol for Wi-Fi Mesh Networks (Wi-Fi 메쉬 네트워크를 위한 다중 채널 스케줄링 MAC (MCS-MAC) 프로토콜)

  • Wu, Ledan;Yang, Jae-Young;Zhou, Yafeng;Jeong, Han-You
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.1C
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    • pp.54-62
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    • 2012
  • A Wi-Fi mesh network providing multi-hop wireless connections based on IEEE 802.11 PHY/MAC technology has recently received a significant attention as a network infrastructure that interconnects RFID systems and wireless sensor networks (WSNs). However, the current IEEE 802.11 contention-based MAC protocol cannot fully utilize the network capacity due to eithor frame collisions or unused network resources. In this paper, we propose a novel multi-channel scheduling MAC (MCS-MAC) protocol for Wi-Fi mesh networks. Under the secondary interference model of Wi-Fi mesh networks, the MCS-MAC protocol can maximize the network throughput via activation of collision-free links that has a maximal link weight. Through the simulations, we show that the throughput of the MCS-MAC protocol is at least three times higher than that of existing MAC protocols in Wi-Fi mesh networks.