| Presentation | 2005-05-27 Avoiding Asymmetric Link and Link Break by Using RSSI Information Suhua TANG, Bing ZHANG, Masahiro WATANABE, Hisato IWAI, Sadao OBANA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | Asymmetric link / link break / RSSI / antenna gain / prediction / link state |
| Paper # | RCS2005-22 |
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| Committee | RCS |
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| Conference Date | 2005/5/19(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Avoiding Asymmetric Link and Link Break 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() |
| 2nd Author's Name | Bing ZHANG |
| 2nd Author's Affiliation | ATR Adaptive Communications Research Laboratories |
| 3rd Author's Name | Masahiro WATANABE |
| 3rd Author's Affiliation | ATR Adaptive Communications Research Laboratories |
| 4th Author's Name | Hisato IWAI |
| 4th Author's Affiliation | ATR Adaptive Communications Research Laboratories |
| 5th Author's Name | Sadao OBANA |
| 5th Author's Affiliation | ATR Adaptive Communications Research Laboratories |
| Date | 2005-05-27 |
| Paper # | RCS2005-22 |
| Volume (vol) | vol.105 |
| Number (no) | 88 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |