| Presentation | 2019-05-30 [Invited Lecture] A study on frequency utilization efficiency improvement for Unlicensed LPWA Takahiro Chiba, Masanori Taira, Mikio Kuwahara, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently, a lot of IoT devices are connecting to network and rapid glowth of unlicensed LPWA, such as using 920MHz, is expected. There are three issues in practical use of Unlicensed LPWA, for one reason is the packet collision caused by autonomous uplink transmission of IoT devices, and for one reason is the inefficiency for an ACK transmission, and for another is the retransmission method intended for immobile devices. To address these issues, we propose three techniques: 1. The uplink transmission control method in Unlicensed LPWA, 2. The downlink transmission reduction method related to ACK transmission, 3. The retransmission method adequate for IoT use cases. We show the performance evaluation and the simulation results to prove the proposed method improves frequency utilization efficiency. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Unlicensed / LPWA / LoRaWAN / IoT |
| Paper # | SR2019-9 |
| Date of Issue | 2019-05-23 (SR) |
| Conference Information | |
| Committee | SR |
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| Conference Date | 2019/5/30(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tokyo Big Sight |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Technical Exhibition, LPWA, General |
| Chair | Kenta Umebayashi(Tokyo Univ. of Agric. and Tech.) |
| Vice Chair | Masayuki Ariyoshi(NEC) / Suguru Kameda(Tohoku Univ.) |
| Secretary | Masayuki Ariyoshi(NICT) / Suguru Kameda(ATR) |
| Assistant | Gia Khanh Tran(Tokyo Inst. of Tech.) / Syusuke Narieda(Mie Univ.) / Koji Ohshima(Kozo Keikaku Engineering) / Mai Ohta(Fukuoka Univ.) / Teppei Oyama(Fujitsu Lab.) |
| Paper Information | |
| Registration To | Technical Committee on Smart Radio |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | [Invited Lecture] A study on frequency utilization efficiency improvement for Unlicensed LPWA |
| Sub Title (in English) | |
| Keyword(1) | Unlicensed |
| Keyword(2) | LPWA |
| Keyword(3) | LoRaWAN |
| Keyword(4) | IoT |
| 1st Author's Name | Takahiro Chiba |
| 1st Author's Affiliation | Hitachi Ltd.(Hitachi) |
| 2nd Author's Name | Masanori Taira |
| 2nd Author's Affiliation | Hitachi Ltd.(Hitachi) |
| 3rd Author's Name | Mikio Kuwahara |
| 3rd Author's Affiliation | Hitachi Ltd.(Hitachi) |
| Date | 2019-05-30 |
| Paper # | SR2019-9 |
| Volume (vol) | vol.119 |
| Number (no) | SR-62 |
| Page | pp.pp.57-62(SR), |
| #Pages | 6 |
| Date of Issue | 2019-05-23 (SR) |