1. Pathloss and Channel Model Considerations for P802.11ah
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Pathloss and Channel Model Considerations for P802.11ah
Date: July 15th 2011
Authors:
Klaus Doppler, Nokia
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Abstract
Currently proposed channel and pathloss models (doc.: IEEE /0883r0) do not include a pathloss and channel model between stations for outdoor deployments
Review of pathloss models in literature
Pathloss model proposal
John Doe, Some Company

3. Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Outdoor deployments
Pathloss model for AP-STA link in (doc.: IEEE /0883r0)
Pathloss models in 3GPP typically do not include STA-STA links (no STA-STA interference in FDD and synchronized TDD)
Link is very different for AP-STA and STA-STA link (see illustration on right)
AP-STA
AP-STA
15m
STA-STA
Klaus Doppler, Nokia
John Doe, Some Company

4. STA-STA measurements in urban environment
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
STA-STA measurements in urban environment
Very few measurement results for STA-STA link in urban available
Z. Wang, E.K. Tameh, A. R. Nix, “Statistical Peer-to-Peer Channel Models for Outdoor Urban Environments at 2GHz and 5GHz”, VTC Fall, 2004
J. R. Hampton, N. M. Merheb, W. L. Lain, D. E. Paunil, R. M. Shuford,and W. T. Kasch, “Urban propagation measurements for ground based communication in the military UHF band,” IEEE Trans. Antennas and Propagat., vol. 54, no. 2, pp. 644–654, Feb
Klaus Doppler, Nokia
John Doe, Some Company

5. Pathloss considerations
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Pathloss considerations
[1] PL_NLOS = *5.86 log10 (d in m) (f=2GHz) PL_LOS = *2 log10(d in m) (f=900MHz)
[2] Model needs explicit modeling of streets and fewer measurements compared to 1. However, their measurements also suggest a pathloss exponent of 6-7 in NLOS case (only few measurements)
TGn models (including case F, outdoor hotspot) suggest a pathloss exponent of 3.5 which is clearly too low(doc.: IEEE /0883r0)
Klaus Doppler, Nokia
John Doe, Some Company

6. Frequency scaling 2GHz  900MHz
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Frequency scaling 2GHz  900MHz
[3] Path-loss can be converted to frequency range 450 – 900 MHz by applying different frequency dependence coefficients in the range 20 – 35 dB per decade specified for frequency ranges 0.45 – 1.5, 1.5 –2.0 and 2.0 – 6.0 GHz separately. (See Table 4-1. in [3])
Pathloss for urban scenario decreases 10.18dB from 2GHz to 900MHz
Klaus Doppler, Nokia
John Doe, Some Company

7. Pathloss model comparison
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Pathloss model comparison
AP-STA (doc.: IEEE /0883r0) for pico/hotspot deployment
Significant difference when using AP-STA or .11n F pathloss model compared to P2P measurements in urban scenario
Klaus Doppler, Nokia
John Doe, Some Company

8. Proposal Use as pathloss model for outdoor simulations (f = 900MHz)
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Proposal
Use as pathloss model for outdoor simulations (f = 900MHz)
PL_NLOS = *5.86 log10 (d in m)
PL_LOS = *2 log10(d in m)
Klaus Doppler, Nokia
John Doe, Some Company

9. Proposal to obtain LOS probability
Month Year
doc.: IEEE yy/xxxxr0
July. 2011
Proposal to obtain LOS probability
Derived from measurements
About
Close to
Read LOS probability from 2G MS-MS curve in left figure
Klaus Doppler, Nokia
John Doe, Some Company

10. Month Year
doc.: IEEE yy/xxxxr0
July. 2011
References
Z. Wang, E.K. Tameh, A. R. Nix, “Statistical Peer-to-Peer Channel Models for Outdoor Urban Environments at 2GHz and 5GHz”, VTC Fall, 2004
J. R. Hampton, N. M. Merheb, W. L. Lain, D. E. Paunil, R. M. Shuford,and W. T. Kasch, “Urban propagation measurements for ground based communication in the military UHF band,” IEEE Trans. Antennas and Propagat., vol. 54, no. 2, pp. 644–654, Feb
WINNER+ D5., WINNER+ Final Channel Models, June 2010
Klaus Doppler, Nokia
John Doe, Some Company