Low iatency transmission protocols for IEEE 802.15.4 multi-hop networks over unreliable wireless links = 불안정한 무선 링크 상의 IEEE 802.15.4 멀티 홉 네트워크를 위한 저지연 통신 기법

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For many years, IEEE 802.15.4 standard has been used for various multi-hop networks such as wireless sensor networks (WSNs) and internet of things (IoT). Recently, many applications in IEEE 802.15.4 multi-hop networks have required supporting low delivery latency, and then low latency transmission protocols have been also proposed. In these transmission protocols, nodes synchronize time slots to forward data packets sequentially over multiple hos, so the data packets can be transmitted with low delay. However, they have shown limited performance over unreliable wireless links. Since the nodes tightly synchronize the time slot for the sequential transmissions, drooped packets cannot be retransmitted immediately. It will lead to not only delayed retransmissions but also the additional delay caused by end-to-end retransmissions. Furthermore, this limitation has become serious over multi-hop transmission because packets are dropped more frequently. To maintain lower delivery latency with unreliable and multihop transmissions, this dissertation proposes the enhanced low latency transmission protocols. In the proposed protocols, nodes adjust the synchronized time slots by considering unreliable wireless links and channels. Then, nodes can retransmit dropped data packets immediately, and thus they can avoid the delayed retransmissions. Moreover, it helps to improve the transmission reliability, so additional delay caused by end-to-end retransmissions can be also prevented. The enhancements are veri ed through theoretical and simulation-based analysis. The analysis shows that that the proposed protocols can maintain much lower delivery latency regardless of various channel/link conditions and other network environments.
Advisors
Yoon, Hyun Sooresearcher윤현수researcher
Description
한국과학기술원 :전산학부,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전산학부, 2018.2,[iv, 67 p. :]

Keywords

IEEE 802.15.4 standard▼amulti-hop networks▼awireless sensor networks▼ainternet of things▼areservation mechanism▼achannel condition measurement▼abulk data transfer▼apipeline transmissions▼amulti-path transmissions▼alink quality measurement; IEEE 802.15.4 표준▼a멀티홉 네트워크▼a무선 센서 네트워크▼a사물 인터넷▼a예약 기법▼a채널 상태 측정▼a대용량 데이터 전송▼a파이프라인 전송▼a다중경로 전송▼a링크 상태 측정

URI
http://hdl.handle.net/10203/265341
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734425&flag=dissertation
Appears in Collection
CS-Theses_Ph.D.(박사논문)
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