Extension of Interframe Space for Long Distance Wireless Transmission Support
Explore the proposal to adjust the Interframe space timing parameter in the IEEE 802.15.3 specification to facilitate long-distance transmission in wireless networks. The document highlights challenges faced in maintaining data transmission integrity over several kilometers and presents solutions to address propagation delays. It aims to enhance the current standard to enable successful data transmission even at extended distances with maintained signal quality.
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July 2021 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) doc.: IEEE 802.1515-21--0398-00-0thz Submission Title: Extension of Interframe Space for supporting long distance transmission Date Submitted: 20 July, 2021 Source: Keitarou Kondou Company HRCP Research & Development Partnership Address: 1-24-2, Taito, Taito-ku, Tokyo, 110-0016 Japan Voice: +81-3-6806-0236, FAX: +81-3-6806-0206, E-Mail: Keitarou.Kondou@hrcp.jp Re: Abstract: When 802.15.3d is employed for several-killometer wireless link, even SNR of the signal is maintained, data transmission might not be established due to huge propagation delay. Showing maximum distance supported with current spec and suggesting extension of the parameter Purpose: Change timing parameter of Interframe space in the next version of the 802.15.3 specification. Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Submission Slide 1 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz Extension of Interframe Space for supporting long distance transmission Keitarou Kondou HRCP R&D Partnership Submission Slide 2 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz Introduction of ThoR ThoR is EU-japan project for developing THz radio link for beyond 5G network The scope of the project is supporting > 100 Gbps over 1 Km at 300 GHz implementing the IEEE 802.15.3d Standard Technische Universit t Braunschweig (EU-Koordinator, Deutschland), Waseda University (Japan-Koordinator, Japan), Chiba Institute of Technology (Japan), Gifu University (Japan), Universit t Stuttgart (Deutschland), Fraunhofer-Institut f r Angewandte Festk rperphysik IAF (Deutschland), University of Lille (Frankreich), HRCP (Japan) ,Vivid Components Ltd. (Gro britannien), Siklu Communication Ltd. (Israel), NEC Corporation (Japan) and Deutsche Telekom (Deutschland/Tschechien). Submission Slide 3 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz System Overview Employing plural modems compliant with 802.15.3e for converting user data to IF signal THz standard, 15.3d, shares most of PHY/MAC specification with 15.3e except for center frequency. Several CMOS implementation of 60GHz modems are currently available and can handle Gbps data in real time. 802.15.3e V-band Modem Network Interfac e Baseba nd Modem User Data IF RF Combiner/Splitter 300-GHz RF Network Interfac e Baseba nd Modem IF RF I F antenna Network Interfac e Baseba nd Modem IF RF Submission Slide 4 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz Channel Access on 15.3d/e As 802.15.3d only supports P2P topology, two devices, PRC and DEV, transmit data alternatively. SIFS Header with ACK Data PRC DEV time Normal case RIFS PRC DEV time Retransmission case Submission Slide 5 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz Concerns on long distance transmission When transmission distance is getting longer, we may have to consider propagation delay Device A Device B time (a) Short distance 2 times of propagation delay is added before receiving ACK send receive send Device A Device B receive send receive time (b) Long distance Submission Slide 6 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz Distance covered with 15.3d standard up to 2.5 us of SIFS duration (?????) is supported and RIFS is defined as below (for PRC) 2 ?????+ 3.01 (us) Then, Maximum RIFS allowed is 8.01 us. Normal operation, ACK is received after 2 ??+ ????? , where ?? is propagation delay Only 1 Km distance causes 3.3 us of delay, 2 3.3 + 2.5 > 8.01 This initiates unexpected retransmission ! Submission Slide 7 Keitarou Kondou, HRCP R&D Partnership
July 2021 doc.: IEEE 802.1515-21--0398-00-0thz Suggested Change The modem employed in the ThoR supports 40ms of RIFS, which results in 2800 Km in length. Apparently, too much At least we have to extend RIFS 10 times of current RIFS value We also need another equation for RIFS for supporting both short/long distance Submission Slide 8 Keitarou Kondou, HRCP R&D Partnership
