| Presentation | 2019-06-20 Low Latency Hybrid ARQ Method Using Early Retransmission Before Channel Decoding with Multistage Decision Kentarou Taniyama, Yoshihisa Kishiyama, Kenichi Higuchi, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper extends our previously reported low latency hybrid automatic repeat request (HARQ) using early retransmission before channel decoding to perform multistage judgement at the early-retransmission decision. The low latency HARQ method can mitigate the increased transmission latency resulting mainly from the delay time required for the channel decoding in HARQ by requesting early retransmission before channel decoding process is completed based on the channel state information obtained before channel decoding. However, the early-retransmission decision may include error, which results in unnecessary retransmission and consequently throughput loss. To address the potential throughput loss due to the decision error in early-retransmission request, we use the multistage decision in which the number of bits conveyed by the early-retransmission packet is controlled dependent on the measured channel state information before channel decoding. By setting the number of retransmit bits small when the observed channel state seems borderline to perform the early retransmission, we can reduce the throughput loss when the early retransmission is not necessary, as the initial packet is eventually channel decoded correctly. Simulation results show that the proposed method further improves the achievable tradeoff between the transmission latency and throughput, which contributes to realize the ultra-reliable low latency communications (URLLC). |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | 5G / hybrid ARQ / URLLC / retransmission |
| Paper # | RCS2019-65 |
| Date of Issue | 2019-06-12 (RCS) |
| Conference Information | |
| Committee | RCS |
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| Conference Date | 2019/6/19(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Miyakojima Hirara Port Terminal Building |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. |
| Chair | Tomoaki Otsuki(Keio Univ.) |
| Vice Chair | Satoshi Suyama(NTT DoCoMo) / Fumiaki Maehara(Waseda Univ.) / Toshihiko Nishimura(Hokkaido Univ.) |
| Secretary | Satoshi Suyama(NTT) / Fumiaki Maehara(Kyushu Univ.) / Toshihiko Nishimura |
| Assistant | Kazushi Muraoka(NTT DOCOMO) / Shinsuke Ibi(Doshisha Univ.) / Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Shinya Kumagai(Fujitsu Labs.) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Low Latency Hybrid ARQ Method Using Early Retransmission Before Channel Decoding with Multistage Decision |
| Sub Title (in English) | |
| Keyword(1) | 5G |
| Keyword(2) | hybrid ARQ |
| Keyword(3) | URLLC |
| Keyword(4) | retransmission |
| 1st Author's Name | Kentarou Taniyama |
| 1st Author's Affiliation | Tokyo University of Science(Tokyo Univ. of Science) |
| 2nd Author's Name | Yoshihisa Kishiyama |
| 2nd Author's Affiliation | NTT DOCOMO, INC.(NTT DOCOMO) |
| 3rd Author's Name | Kenichi Higuchi |
| 3rd Author's Affiliation | Tokyo University of Science(Tokyo Univ. of Science) |
| Date | 2019-06-20 |
| Paper # | RCS2019-65 |
| Volume (vol) | vol.119 |
| Number (no) | RCS-90 |
| Page | pp.pp.169-174(RCS), |
| #Pages | 6 |
| Date of Issue | 2019-06-12 (RCS) |