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Paper Abstract and Keywords
Presentation 2005-05-27 11:40
Avoiding asymmetric links and link breaks by using RSSI information
Suhua Tang, Bing Zhang, Masahiro Watanabe, Hisato Iwai, Sadao Obana (ATR)
Abstract (in Japanese) (See Japanese page) 
(in English) Most of the existing routing protocols treat the wireless links as symmetric and periodic beacons are employed to detect the link connectivity. However, in the ubiquitous communication environment, different transmitting power due to power control or different capability of the batteries, or different antenna gain between the sender and the receiver, may result in asymmetric links over which one node can hear its neighbors, but not vice versa. Of the currently proposed protocols, the reactive routing protocols have much trouble in the presence of asymmetric links. In this paper, we propose to detect and avoid asymmetric links, and enhance the well-known on-demand routing protocol AODV. The hello packets, appended with optimized link states, are used to detect and avoid the asymmetric links both during the route discovery and in the communication. Received Signal Strength Indicator (RSSI) is contained in the link state, and used to predict the RSSI for either direction of the link when a data packet is to be forwarded. In this way, the asymmetric or broken links can be detected quickly. When the predicted RSSI is near the receivable threshold, the node may temporarily increase its transmitting power so that its neighbors can hear clearly. Hence, the links that are not seriously asymmetric can still be used and unnecessary route discovery can be avoided. Simulation results show that our protocol achieves higher packet delivery ratio and throughput while keeping almost the same packet overhead as the original AODV protocol.
Keyword (in Japanese) (See Japanese page) 
(in English) Asymmetric link / link break / RSSI / antenna gain / prediction / link state / /  
Reference Info. IEICE Tech. Rep., vol. 105, no. 88, RCS2005-22, pp. 35-40, May 2005.
Paper # RCS2005-22 
Date of Issue 2005-05-19 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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Conference Information
Committee RCS IN  
Conference Date 2005-05-26 - 2005-05-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2005-05-RCS-IN 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Avoiding asymmetric links and link breaks by using RSSI information 
Sub Title (in English)  
Keyword(1) Asymmetric link  
Keyword(2) link break  
Keyword(3) RSSI  
Keyword(4) antenna gain  
Keyword(5) prediction  
Keyword(6) link state  
1st Author's Name Suhua Tang  
1st Author's Affiliation ATR Adaptive Communications Research Laboratories (ATR)
2nd Author's Name Bing Zhang  
2nd Author's Affiliation ATR Adaptive Communications Research Laboratories (ATR)
3rd Author's Name Masahiro Watanabe  
3rd Author's Affiliation ATR Adaptive Communications Research Laboratories (ATR)
4th Author's Name Hisato Iwai  
4th Author's Affiliation ATR Adaptive Communications Research Laboratories (ATR)
5th Author's Name Sadao Obana  
5th Author's Affiliation ATR Adaptive Communications Research Laboratories (ATR)
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Date Time 2005-05-27 11:40:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2005-22 
Volume (vol) IEICE-105 
Number (no) no.88 
Page pp.35-40 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2005-05-19 

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