• Title/Summary/Keyword: Adaptive OLSR

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Adaptive OLSR Protocol Based on Average Node Distance in Airdropped Distributed Mobility Model (분산 낙하 이동 모델에서의 평균 노드 거리 기반 적응적 OLSR 프로토콜)

  • Lee, Taekmin;Lee, Jinhae;Wang, Jihyeun;Yoo, Joonhyuk;Yoo, Seong-eun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.13 no.2
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    • pp.83-91
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    • 2018
  • With the development of IT (Information Technology) technology, embedded system and network technology are combined and used in various environments such as military environment as well as everyday life. In this paper, we propose a new airdropped distributed mobility model (ADMM) modeling the dispersion falling of the direct shot of a cluster bomb, and we compare and analyze some representative MANET routing protocols in ADMM in ns-3 simulator. As a result of the analysis, we show OLSR routing protocol is promising in ADMM environment in the view points of packet delivery ratio (PDR), end to end delay, and jitter. In addition, we propose a new adaptation scheme for OLSR, AND-OLSR (Average Node Distance based adaptive-OLSR) to improve the original OLSR in ADMM environment. The new protocol calculates the average node distance, adapts the period of the control message based on the average node distance increasing rate. Through the simulation study, we show that the proposed AND-OLSR outperforms the original OLSR in PDR and control message overhead.

Internetworking strategy between MANET and WLAN for Extending Hot-Spot of WLAN based on HMIPv6 (HMIPv6를 기반으로 한 무선 랜과 이동 애드 혹 네트워크 간의 인터네트워킹 기법)

  • Lee Hyewon K.;Mun Youngsong
    • Journal of KIISE:Information Networking
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    • v.33 no.1
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    • pp.38-48
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    • 2006
  • For extending of hot-spot of WLAN, (2) proposes internetworking scheme between wireless LAN (WLAN) and mobile ad-hoc network (MANET), which employ the same layer-2 protocol with different mode. Compared to internetworking schemes between UMTS (Universal Mobile Telecommunications Systems) and WLAN (3-4), the scheme from (2) has relatively low overhead and latencies because WLAN and MANET are physically and logically similar to each other. However, the mode switching algorithm proposed in r2] for internetworking between WLAN and MANET only considers signal strength and determines handoff, and mobile nodes following a zigzag course in pollution area may perform handoff at short intervals. Furthermore, (2) employs mobile IPv6 (MIPv6) at base, which brings still high delay on handoff and overhead due to signal message exchange. In this paper, we present optimized internetworking scheme between WLAN and MANET, modified from (2). To settle ping-pong handoff from (2), we propose adaptive mode switching algorithm. HMIPv6 is employed for IP connectivity and mobility service in WLAN, which solves some shortcomings, such as high handoff overhead and vulnerable security. For routing in MANET, OLSR is employed, which is a proactive Protocol and has optimally reduced signal broadcasting overhead. OLSR operates with current P protocol compatibly with no change or modification. The proposed internetworking scheme based on adaptive mode switching algorithm shows better performance than scheme from (2).

A Study of Mobile Ad-hoc Network Protocols for Ultra Narrowband Video Streaming over Tactical Combat Radio Networks (초협대역 영상전송 전투무선망을 위한 Mobile Ad-hoc Network 프로토콜 연구)

  • Seo, Myunghwan;Kim, Kihun;Ko, Yun-Soo;Kim, Kyungwoo;Kim, Donghyun;Choi, Jeung Won
    • Journal of the Korea Institute of Military Science and Technology
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    • v.23 no.4
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    • pp.371-380
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    • 2020
  • Video is principal information that facilitates commander's immediate command decision. Due to fading characteristics of radio link, however, it is difficult to stably transmit video in a multi-hop wireless environment. In this paper, we propose a MANET structure composed of a link adaptive routing protocol and a TDMA MAC protocol to stably transmit video traffic in a ultra-narrowband video streaming network. The routing protocol can adapt to link state change and select a stable route. The TDMA protocol enables collision-free video transmission to a destination using multi-hop dynamic resource allocation. As a result of simulation, the proposed MANET structure shows better video transmission performance than proposed MANET structure without link quality adaption, AODV with CSMA/CA, and OLSR with CSMA/CA structures.