NDLI: Opportunistic Link Scheduling for Multihop Wireless Networks

Content Provider	IEEE Xplore Digital Library
Author	Min Shen Dongmei Zhao
Copyright Year	2007
Description	Author affiliation: McMaster Univ., Hamilton (Min Shen; Dongmei Zhao)
Abstract	One of the reasons that cause low transmission throughput in IEEE 802.11-based multihop networks is packet losses. Compared to transmitting a new packet, retransmitting a packet in 802.11-based networks has a lower priority in accessing the channel and requires a longer channel idle time for backoffs. When the number of retransmissions exceeds a certain threshold, a packet is dropped at the link layer. For TCP traffic, this will eventually result in TCP timeout, and the lost packet will be retransmitted at the transport layer, causing end- to-end throughput degradation. Furthermore, the mechanism that TCP adjusts its congestion window size negatively affects the transmission throughput in 802.11-based multihop networks. In this paper we propose an opportunistic link scheduling (OLS) protocol, which schedules transmissions of the links based on their channel conditions, including both channel fading and co-channel interference. Links with good channel conditions are given a higher priority to access the channel and allowed to transmit a limited number of packets consecutively without repeatedly competing the channel. OLS also includes mechanisms to avoid buffer overflow and prevent starving links with poor channel conditions. Our results show that OLS can significantly improve the end-to-end transmission throughput, while keeping reasonably low transmission delay. The protocol is easy to implement, and requires minor changes to the 802.11 protocol.
Starting Page	5064
Ending Page	5069
File Size	143216
Page Count	6
File Format	PDF
ISBN	9781424410422
DOI	10.1109/GLOCOM.2007.960
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-11-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spread spectrum communication Wireless networks Throughput Propagation losses Telecommunication traffic Degradation Access protocols Fading Interchannel interference Buffer overflow
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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