| Presentation | 2023-09-08 Analysis and Evaluation of TCP Communication Quality in Low Earth Orbit Satellite Constellations Akane Suzuki, Kenji Kanai, Akihiro Nakao, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Because Low Earth Orbit (LEO) satellite has characteristics of low latency and high coverage communication, integration of LEO and 5G communication is expected to offer high-speed communication in weak terrestrial network areas and disaster areas. For effective integration, it is necessary to grasp the communication quality differences. However, a detailed analysis of the communication quality characteristics of Starlink, which LEO represents, has yet to be fully discussed. Although we revealed that Starlink’s UDP throughput fluctuates periodically in our previous study, we still need to analyze and evaluate TCP throughputs, including CUBIC-TCP. We must investigate why Starlink’s TCP throughput significantly degraded compared to UDP. Therefore, in this paper, we newly evaluate TCP throughput, RTT, TCP packet-level traces, and TCP congestion window parameters to analyze TCP congestion behaviors. From the analysis, the results confirm that Starlink’s TCP throughput fluctuates periodically due to Starlink’s communication control mechanism as well as UDP. In addition, congestion windows are decreased not only because of the packet losses of wireless transmission links but also the packet losses of Starlink’s periodic available bandwidth fluctuation. For quantitative evaluations, we show degradation of TCP throughput due to the unnecessary congestion window reduction and demonstrate the expected improvement of TCP throughput when TCP does not decrease the congestion window even if Starlink drops the packets. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Low Earth Orbit Satellite Constellations / TCP / Congestion Control |
| Paper # | NS2023-66 |
| Date of Issue | 2023-08-31 (NS) |
| Conference Information | |
| Committee | NS / IN / CS |
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| Conference Date | 2023/9/7(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tohoku University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Session management (SIP/IMS), Interoperability/Standardization, NGN/NwGN/Future networks, Cloud/Data center networks, SDN (OpenFlow, etc.)/NFV, IPv6, Machine learning, etc. |
| Chair | Tetsuya Oishi(NTT) / Kunio Hato(NTT) / Daisuke Umehara(Kyoto Inst. of Tech.) |
| Vice Chair | Takumi Miyoshi(Shibaura Inst. of Tech.) / Tsutomu Murase(Nagoya Univ.) / Seiji Kozaki(Mitsubishi Electric) |
| Secretary | Takumi Miyoshi(NTT) / Tsutomu Murase(Kogakuin Univ.) / Seiji Kozaki(NTT) |
| Assistant | Hiroshi Yamamoto(NTT) / / Hikaru Kawasaki(NICT) / Takeshi Suehiro(Mitsubishi Electric) |
| Paper Information | |
| Registration To | Technical Committee on Network Systems / Technical Committee on Information Networks / Technical Committee on Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Analysis and Evaluation of TCP Communication Quality in Low Earth Orbit Satellite Constellations |
| Sub Title (in English) | |
| Keyword(1) | Low Earth Orbit Satellite Constellations |
| Keyword(2) | TCP |
| Keyword(3) | Congestion Control |
| 1st Author's Name | Akane Suzuki |
| 1st Author's Affiliation | The University of Tokyo(UTokyo) |
| 2nd Author's Name | Kenji Kanai |
| 2nd Author's Affiliation | The University of Tokyo(UTokyo) |
| 3rd Author's Name | Akihiro Nakao |
| 3rd Author's Affiliation | The University of Tokyo(UTokyo) |
| Date | 2023-09-08 |
| Paper # | NS2023-66 |
| Volume (vol) | vol.123 |
| Number (no) | NS-177 |
| Page | pp.pp.83-88(NS), |
| #Pages | 6 |
| Date of Issue | 2023-08-31 (NS) |