Supporting Document for Wall Penetration Loss Month Year doc.: IEEE 802.11-yy/xxxxr0 January 2010 doc.: IEEE 802.11-10/0078r0 Supporting Document for Wall Penetration Loss Authors: Submission Slide 1 Minho Cheong, ETRI and Peter Loc, Ralink Page 1 John Doe, Some Company

January 2010 doc.: IEEE 802.11-10/0078r0 Background In TGac simulation scenario #4 (in-home entertainment with OBSS), there are two types of walls. (room walls, outside walls) It is needed to define its wall penetration loss for realistic network simulation. Submission Slide 2 Minho Cheong, ETRI and Peter Loc, Ralink

AP and STA Locations in Scenario #4 January 2010 doc.: IEEE 802.11-10/0078r0 AP and STA Locations in Scenario #4 Room walls are introduced at x=-39 and x=41. Slide 3

When We Set Wall Penetration Loss, January 2010 doc.: IEEE 802.11-10/0078r0 When We Set Wall Penetration Loss, It depends quite a lot upon several factors such as Frequency Structure of wall (& number of layers in the structure) Materials of wall (& mixing or not) Wet or dry Window or not (& size of window) And so on It is not possible to set a typical value covering all cases. Instead, we try to pick an acceptable one which can be roughly applied to general case. From several references (measurements @ 5GHz band) Slide 4

Measurement by USC (2002) [1] January 2010 doc.: IEEE 802.11-10/0078r0 Measurement by USC (2002) [1] < 0.01dB (blinds) ~ 15dB (brick) according to various materials Submission Slide 5 Minho Cheong, ETRI and Peter Loc, Ralink

Measurement by Lund Univ. (1999) [2] January 2010 doc.: IEEE 802.11-10/0078r0 Measurement by Lund Univ. (1999) [2] For a mixture wall 1 dB ~ 10 dB loss variation according to frequency (5~6GHz) Submission Slide 6 Minho Cheong, ETRI and Peter Loc, Ralink

January 2010 doc.: IEEE 802.11-10/0078r0 Document by UK Government (1997) [3] Radio Comm. Agency in Department of Trade & Industry This document concluded that - 10 dB would be a practical figure for outside wall - based upon 9 other references. Submission Slide 7 Minho Cheong, ETRI and Peter Loc, Ralink

January 2010 doc.: IEEE 802.11-10/0078r0 Measurement by ERC (1999) [4] ERC : European Radio-communications Committee Typical interior materials : 0.4 dB ~ 3.4 dB loss Typical exterior materials : 6.9 dB ~ 11.7 dB loss Submission Slide 8 Minho Cheong, ETRI and Peter Loc, Ralink

January 2010 doc.: IEEE 802.11-10/0078r0 Measurement Results 10 dB per an outside wall can be an acceptable figure at 5GHz band for wall penetration loss based on various references. 3 dB per a room wall can be an acceptable figure at 5GHz band for wall penetration loss based on various references. Submission Slide 9 Minho Cheong, ETRI and Peter Loc, Ralink

Applying Double-Walled Structure January 2010 doc.: IEEE 802.11-10/0078r0 Applying Double-Walled Structure Nowadays, double-walled structure becomes more and more popular thanks to Good prevention of noises Good preserving of heat in a room Wall penetration loss of double-walled structure is two time that of an outside wall So, it is not a bad idea to apply a double-walled structure to one or two of outside walls in scenario #4. Submission Slide 10 Minho Cheong, ETRI and Peter Loc, Ralink

Applying Double-Walled Structure January 2010 doc.: IEEE 802.11-10/0078r0 Applying Double-Walled Structure When we apply double-walled structure, link budget calculations for one of most distant pairs of STAs (between STA17 in BSS B and STA20 in BSS C) are Max tx power is assumed : +23 dBm Thermal noise is assumed : -90 dBm Path Loss & SNR Double-wall structure is applied to one outside wall (btw. B and A) Path Loss = 113 dB SNR = 0dB Double-wall structure is applied to two outside walls Path Loss = 123 dB SNR = -10dB I think it is more desirable to apply double-walled structure to two outside walls. Submission Slide 11 Minho Cheong, ETRI and Peter Loc, Ralink

January 2010 doc.: IEEE 802.11-10/0078r0 Conclusion So, it can be described in simulation scenario #4 of Functional Requirements and Evaluation Methodology Document “Attenuation factor of each room wall is set to 3 dB” “Attenuation factor of outside wall is set to 20 dB”.  Submission Slide 12 Minho Cheong, ETRI and Peter Loc, Ralink

January 2010 doc.: IEEE 802.11-10/0078r0 References [1] Propagation losses through common building materials: 2.4GHz vs. 5GHz, 2002. [2] Wideband measurement and analysis of penetration loss in the 5GHz band, 1999. [3] Building shielding loss at 5GHz, 1997. [4] Compatibility studies related to the possible extension band for HIPERLAN at 5GHz, 1999. Submission Slide 13 Minho Cheong, ETRI and Peter Loc, Ralink