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

2. January 2010
doc.: IEEE /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

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

4. When We Set Wall Penetration Loss,
January 2010
doc.: IEEE /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 5GHz band)
Slide 4

5. Measurement by USC (2002) [1]
January 2010
doc.: IEEE /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

6. Measurement by Lund Univ. (1999) [2]
January 2010
doc.: IEEE /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

7. January 2010
doc.: IEEE /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

8. January 2010
doc.: IEEE /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

9. January 2010
doc.: IEEE /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

10. Applying Double-Walled Structure
January 2010
doc.: IEEE /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

11. Applying Double-Walled Structure
January 2010
doc.: IEEE /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

12. January 2010
doc.: IEEE /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

13. January 2010
doc.: IEEE /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