Project: IEEE P802.15 Working Group for Wireless Personal Area - PowerPoint PPT Presentation

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Presentation on Spectrum Issues at THz Frequencies to IEEE 802.18 Date Submitted: 12 November 2012 Source: Thomas Kürner (Editor) Company: TU Braunschweig, Institut für Nachrichtentechnik Address: Schleinitzstr. 22, D-38092 Braunschweig, Germany Voice: +495313912416 FAX: +495313915192, E-Mail: t.kuerner@tu-bs.de Re: doc. IEEE 802.15-320r1, IEEE 802.15-322, IEEE 802.15-416 Re: doc. IEEE 802.15 320r1, IEEE 802.15 322, IEEE 802.15 416 Abstract: The document summarizes the current status on spectrum availability for THz communications in the frequency band beyond 300 GHz. Purpose: Information to IEEE 802.18 form IEEE 802.15 IG THz p 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. 13.11.2012 Slide 1 Thomas Kürner, TU Braunschweig/Germany

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Outline • Summary on possible applications for THz communcations communcations • Analysis on potential interference with passive services services • Dialogue with representatives from passive services • Current discussion relevant for THz communications • Current discussion relevant for THz communications at ITU-R • Next steps Next steps 13.11.2012 Slide 2 Thomas Kürner, TU Braunschweig/Germany

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Possible Applications and Complexity of P ibl A li ti d C l it f the Techncial Solutions Application Operational Typical Range Specific Propagation Requirements for Environment Conditions Antenna Alignment • xxx Fixed Wireless Links Links of the backbone A few hundred meters LOS; Atmospheric Highly directive network; static use; up to several kilometers attenuation becomes antennas; alignment outdoor outdoor important important during the installation during the installation process by radio engineers THz Nano Cells Part of a hierarchical < 100m LOS/NLOS; dynamically automatic beam cellular network; changing conditions steering required potentially mobile users; potentially mobile users; indoor as well as outdoor WLAN/WPAN Connection to access < 100m (mostly < 10m) LOS/NLOS; dynamically automatic beam points; nomadic users; changing conditions steering required mainly indoor mainly indoor Kiosk Downloading indoor, nomadic use A few meters (a few cm) LOS, multiple reflections automatic beam steering from Tx and Rx ( manual alignment may be possible ) Connecting Devices on indoor (typically on a a few cm LOS, multipaths from ideally by automatic Short Ranges g desktop), nomadic use p), nearby objects and y j beam steering, but g, multiple reflections from manual alignment may Tx and Rx be possible Board-to-Board inside computers, fixed a few cm LOS/NLOS, potentially fixed alignment during Communication use strong multipaths design process possible (automatic beam steering as an option) Source: based on https://mentor.ieee.org/802.15/dcn/11/15-11-0749-00-0thz-scenarios-for-the-application-of-thz-communications.pdf 13.11.2012 Slide 3 Thomas Kürner, TU Braunschweig

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Si Situation Radio Regulations after WRC 2012 i R di R l i f WRC 2012 ITU Radio Regulations Footnote 5 565: ITU Radio Regulations Footnote 5.565: The frequency band 275-1000 GHz may be used by administrations for experimentation with, and development of, various active and passive services. services. - Radio astronomy service: 275-323 GHz, 327-371 GHz, 388-424 GHz, [...] - Earth exploration satellite service and space research service 275 Earth exploration-satellite service and space research service 275- 277 GHz, 294-306 GHz, 316-334 GHz, [...] Administrations are urged to take all practicable steps to protect these passive services from harmful interference. i i f h f l i t f  Two options for THz communications: 1 Transmission in remaining free parts of the THz 1. Transmission in remaining free parts of the THz spectrum 2. Coexistent spectrum usage with radio astronomy/earth exploration astronomy/earth exploration Source: https://mentor.ieee.org/802.15/dcn/12/15-12-0320-02-0thz-what-s-next-wireless-communication-beyond-60-ghz-tutorial-ig-thz.pdf 13.11.2012 Slide 4 Thomas Kürner, TU Braunschweig

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Bands not used by EESS B d t d b EESS 1. Transmission in remaining bands only 1 Transmission in remaining bands only R Remaining i i T t l Total available il bl Frequency Bandwidth • Very small bandwidths Bands • Distributed over entire THz range 286-294 GHz 286 294 GHz 8 GHz 8 GHz  Not feasible for data rates >> 10 Gbit/s 307-313 GHz 6 GHz 356-361 GHz 5 GHz 2. 2 Coexistent spectrum usage Coexistent spectrum usage 366-369 GHz 366-369 GHz 3 GHz 3 GHz • Potential interference of active THz 392-397 GHz 5 GHz systems with 399-409 GHz 10 GHz   radio astronomy radio astronomy 411-416 GHz 411 416 GHz 5 GHz 5 GHz  spaceborn THz sensors 434-439 GHz 5 GHz  Interference investigations inevitable 467-477 GHz 10 GHz f for standardization to comply with the t d di ti t l ith th 502-523 GHz 502 523 GH 21 GHz 21 GH ITU Radio Regulations 527-538 GHz 11 GHz 581-611 GHz 30 GHz Source: https://mentor.ieee.org/802.15/dcn/12/15-12-0320-02-0thz-what-s-next-wireless-communication-beyond-60-ghz-tutorial-ig-thz.pdf 13.11.2012 Slide 5 Thomas Kürner, TU Braunschweig

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum I t f Interference with Radio Astronomy ith R di A t • • Studies available by the National Science Foundation Studies available by the National Science Foundation • Distance of THz transmitter from telescope for interference-free conditions in accordance with ITU protection criteria RA.769: • Worst case : TX pointed directly in direction of telescope at same altitude 60 00- 15-10-0829-0 50 50 40 km) 30 d (k doc. 802.15- 20 Several km height 10 IEEE 0thz 0  Interference in practice extremely unlikely due high telescope  Interference in practice extremely unlikely due high telescope locations on mountains 13.11.2012 Slide 6 Thomas Kürner, TU Braunschweig Source: https://mentor.ieee.org/802.15/dcn/12/15-12-0320-02-0thz-what-s-next-wireless-communication-beyond-60-ghz-tutorial-ig-thz.pdf

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Interference with Earth Exploration (1) I t f ith E th E l ti (1) • • THz transmitters operated outdoor may be pointed skyward: THz transmitters operated outdoor may be pointed skyward: Reflection at rooftop 4.) Multiple 2.) Fixed 3.) Airborne 1.) Nomadic transmitters links systems devices  Which is the maximum tolerable interference power?  How much power will be received by the satellite in the worst case? p y 13.11.2012 Slide 7 Thomas Kürner, TU Braunschweig Source: https://mentor.ieee.org/802.15/dcn/12/15-12-0320-02-0thz-what-s-next-wireless-communication-beyond-60-ghz-tutorial-ig-thz.pdf

November 2012 doc.: IEEE 802.15-12-0619-01-0000-THz_Spectrum Interference with Earth Exploration (2) I t f ith E th E l ti (2) • • Determination of maximum allowed TX output powers for Determination of maximum allowed TX output powers for interference-free conditions: 3.) Allowed TX powers for inter- 1.) Allowed interference powers 2.) Modeling of path losses from ference avoidance at any rate according to ITU Rec. 1092 TX to satellite (worst case) r [dBm] -115 550 150 MHz] Nomadic Device um TX Power [dBm/M Reflecting Object Reflecting Object m Interference Power Airborne TX -130 450 100 Path Loss [dB] -145 350 50 -160 -160 250 250 0 0 Maximum Maximu Simulation Approximation -175 150 -50 300 475 650 825 1000 300 475 650 825 1000 300 475 650 825 1000 f [GHz] f [GHz] f [GHz]  Interference possible under worst case assumptions  Definition of transmit power masks  Limitation of output powers to several 10 dBm 13.11.2012 Slide 8 Thomas Kürner, TU Braunschweig Source: https://mentor.ieee.org/802.15/dcn/12/15-12-0320-02-0thz-what-s-next-wireless-communication-beyond-60-ghz-tutorial-ig-thz.pdf