Pathloss and Channel Model Considerations for P802.11ah Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Pathloss and Channel Model Considerations for P802.11ah Date: July 15th 2011 Authors: Klaus Doppler, Nokia John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Abstract Currently proposed channel and pathloss models (doc.: IEEE 802.11-11/0883r0) 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

Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Outdoor deployments Pathloss model for AP-STA link in (doc.: IEEE 802.11-11/0883r0) 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

STA-STA measurements in urban environment Month Year doc.: IEEE 802.11-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. 2006. Klaus Doppler, Nokia John Doe, Some Company

Pathloss considerations Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Pathloss considerations [1] PL_NLOS = 4.01+ 10*5.86 log10 (d in m) (f=2GHz) PL_LOS = 31.48 + 10*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 802.11-11/0883r0) Klaus Doppler, Nokia John Doe, Some Company

Frequency scaling 2GHz  900MHz Month Year doc.: IEEE 802.11-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

Pathloss model comparison Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Pathloss model comparison AP-STA (doc.: IEEE 802.11-11/0883r0) 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

Proposal Use as pathloss model for outdoor simulations (f = 900MHz) Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Proposal Use as pathloss model for outdoor simulations (f = 900MHz) PL_NLOS = -6.17 + 10*5.86 log10 (d in m) PL_LOS = 31.48 + 10*2 log10(d in m) Klaus Doppler, Nokia John Doe, Some Company

Proposal to obtain LOS probability Month Year doc.: IEEE 802.11-yy/xxxxr0 July. 2011 Proposal to obtain LOS probability Derived from measurements About 15% @100m Close to 0@200m Read LOS probability from 2G MS-MS curve in left figure Klaus Doppler, Nokia John Doe, Some Company

Month Year doc.: IEEE 802.11-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. 2006. WINNER+ D5., WINNER+ Final Channel Models, June 2010 Klaus Doppler, Nokia John Doe, Some Company