| Presentation | 2011-10-28 A CSMA/CA Based MAC Protocol to Improve TCP Performance in Multi-hop Cognitive Network Takamasa KIMURA, Takeo FUJII, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In this paper, we have proposed a novel MAC protocol to improve the TCP (Transmission Control Protocol) performance in a cognitive radio mobile ad hoc network (CR MANET) with wireless LAN system. In particular, we consider the legacy wireless LAN as primary user (PU) and the spectrum is shared with other users (SU: Secondary User) of MANET to increase the spectrum efficiency. In order to realize such spectrum sharing system, the SU should protect the primary system during data sending. In general, the TCP performance of SU dramatically decreases in CR MANET environment. In particular, the congestion control mechanism of TCP miss-detects much congestion due to packet loss and time out caused by PU transmission even if congestion is not appeared. As a result, since TCP of transmitter over-decreases a amount of sending data, TCP performance degrades. In this paper, in order to resolve such problem, we propose an adaptive contention widow size control method to correspond with TCP behavior. In the proposed method, the contention window size is controlled according to the TCP cwnd (congestion window) size at a MAC layer of each secondary transmitter. The performance of the proposed method is evaluated by using computer simulations and we confirm the effectiveness of the proposed method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Cognitive Radio / MANET / MAC protocol / TCP |
| Paper # | SR2011-75 |
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| Committee | SR |
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| Conference Date | 2011/10/19(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Software Radio(SR) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A CSMA/CA Based MAC Protocol to Improve TCP Performance in Multi-hop Cognitive Network |
| Sub Title (in English) | |
| Keyword(1) | Cognitive Radio |
| Keyword(2) | MANET |
| Keyword(3) | MAC protocol |
| Keyword(4) | TCP |
| 1st Author's Name | Takamasa KIMURA |
| 1st Author's Affiliation | Advanced Wireless Communication Research Center (AWCC), The University of Electro-Communications() |
| 2nd Author's Name | Takeo FUJII |
| 2nd Author's Affiliation | Advanced Wireless Communication Research Center (AWCC), The University of Electro-Communications |
| Date | 2011-10-28 |
| Paper # | SR2011-75 |
| Volume (vol) | vol.111 |
| Number (no) | 261 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |