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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: Complex EM Environment in Chinese Hospitals Date Submitted: July 12, 2012 Source: WeiXia Zou, Guiye Wang, Zhenyu Wang, BUPT ; Liang Li, Vinno;

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title:Complex EM Environment in Chinese Hospitals Date Submitted: July 12, 2012 Source: WeiXia Zou, Guiye Wang, Zhenyu Wang, BUPT ; Liang Li, Vinno; Suite 202, Building D, No.2 Xinxi Lu, Beijing, China, Voice: 1-914-333-9687, FAX: 1-914-332-0615, E-Mail: liangli@vinnotech.com Abstract: Opening report for TG4n(MBAN) Task Group Purpose: Outline accomplishments from the March 2012 meeting and planned tasks for this meeting. 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. Liang Li Vinno

  2. Spectrum allocation (China & 15.6 NB) • Transmit power limits(China): • 174-216MHz, 407-425MHz, 608-630MHz: 10mW • 402-405MHz: 25μW (limit bandwidth to 300kHz) 2014/10/30 2

  3. Crowded Chinese Hospital • Due to differences on healthcare system, Chinese intent to hospitals and ask helps from doctors. Chinese hospitals are overcrowded terribly. • Such as Beijing hospitals, patients from all of China are crowded in lobby, halls, waiting areas, garden, and anywhere. 2014/10/30 3

  4. Characteristics of MABN • Therefore, MBAN is intensive in Chinese hospital, and inter-network interferences are serious, and there also exists relative motion among BANs 2014/10/30 4

  5. Pathloss Model(1/2) Pathloss=-Pl0-10*n*lg(d/d0)-L_nw; d0=1m; Pl0（attenuation of d0）=20*lg(4*pi*f/c); 40.5dB(2.4Ghz)/30.6dB（780Mhz） 28.6dB(610Mhz)/25dB(410Mhz)/19.3dB(210Mhz); Pathloss coefficient: n=3.0 ； L_nw(penetrate loss)=n1*L1+n2*L2 (number of concrete wall:n1;concrete attenuation:L1; number of human body:n2;human body attenuation:L2)

  6. Conditions Transmit power:1mw （0dBm） Preceiver = Ptransimmiter*10^(Pathloss/10)

  7. Attenuation Coefficients • The attenuation of penetrating the concrete(200mm depth): • 2.4GHz L1= 13dB • 780Mhz L1=14dB • 610MHz L1= 15.5dB • 410MHz L1= 17dB • 210MHz L1= 18dB

  8. Attenuation Coefficients • According to Rec. ITU-R P.1406-1 The attenuation of penetrating the human body: • 2.4GHz L2= 20dB • 780Mhz L2=16dB • 610MHz L2= 14dB • 410MHz L2= 13.5dB • 210MHz L2= 15.5dB Liang Li , Vinno

  9. The signal power after penetrating one layer of the concrete wall(200mm) x-axis: distance that the signal spread after penetrating one layer of concrete wall y-axis : the signal power after spreading n meters 9

  10. The signal power after penetrating one human body x-axis : distance that the signal spread after penetrating one human body y-axis : the signal power after spreading n meters

  11. The ability to penetrate the human bodies Depth of human body: 0.2m 0.2m-0.4m:penetrate one human body; 0.8m-1.0m:penetrate one human body; 1.5m-1.7m:penetrate one human body; others:free space.

  12. Signal power of freefade and NLOS(penetrate one human body and one layer of concrete wall) x-axis : spreading distance after penetrating nothing/ one human body and one layer of concrete wall y-axis : the signal power after spreading n meters

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