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doc.: IEEE 11-14/0113r1
Submission
Mar. 2014
Minho Cheong (NEWRACOM)Slide 1
Modeling of additional channel loss in dense WLAN environments
Date: 2014-03-17
Authors:Name Affiliations Address Phone emailMinho Cheong NEWRACOM 193 Moonjiro,
Yuseong-Gu, Daejeon, Korea
+82-42-860-5635 [email protected]
Hyoung Jin Kwon NEWRACOM 193 Moonjiro, Yuseong-Gu, Daejeon, Korea
+82-42-860-1698 [email protected]
Jae Seung Lee ETRI [email protected]
doc.: IEEE 11-14/0113r1
Submission
Abstract
• This presentation gives set of considerations on how to model additional channel loss due to human-body blockage we could experience especially in super-dense Wi-Fi environments.
Mar. 2014
Slide 2 Minho Cheong (NEWRACOM)
doc.: IEEE 11-14/0113r1
Submission
Need of Supplements to Current Model
• High density of STAs [1]– such as usage model 4a “Super-dense Urban Street - public access
and cellular offload”
Slide 3 Minho Cheong (NEWRACOM)
Street Supporting in Word Cup 2002 PSY’s Performance Outdoor Man. United’s Street Parade
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Need of Supplements to Current Model
• High density scenarios [2]
– 1a-Stadium: High density of users (0.5users/m²), inter-AP distance between 12 and
20 meters.
– 1b-Airport/trains: Each AP serves 120 users in a 200m2 area (0.6 users/m²). The
inter-AP distance is in the range of 15~20m. Single/multiple operators.
– 1c- Exhibition halls: Each AP serves 100 users in a 100m2 (1.0 user/ m²) area. The
inter-AP distance is in the range of 5~10m.
– 1d- Shopping malls: High density of users and high density of APs (undefined user/
m², but similar to “1c-Exhibition hall”)
– 1e-Education: Dense STAs (40~60 STAs) in one classroom with one AP. Class
room size is ~ 300 m² (0.2 user/ m²).
Slide 4 Minho Cheong (NEWRACOM)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Need of Supplements to Current Model
• High density scenarios [2]
– 2a-Wireless office: Typical distances between STAs and AP in the room are <
50m. 20-30 STAs per AP . Max. user/ m² =30/(3.14*50^2)= 0.04 user/ m²
– 3a-Dense apartment building: Building with 100 apartments. One AP in each
apartment of 10mx10m randomly positioned. 5 STA per AP randomly positioned
in the apartment. Max. user/ m² = 0.01 user/ m²
– 4a-Super-dense urban street: The inter-AP distance is in the range of 20-50m.
STA distribution density is about 0.5 user/ m2. In specific city squares, public
events gather even higher densities 1.0 user/m² and inter-AP distance is in the
range of 10-20m.
Slide 5 Minho Cheong (NEWRACOM)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Additional Path-loss due to Human Body Blockage [2]
• In super-dense scenarios, in addition to general indoor (from 802.11n/ac channel model) or outdoor (from WINNER or ITU model), we need to consider the following environments as well
Slide 6 Minho Cheong (NEWRACOM)
AP
My STA(smart phone)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Additional Path-loss due to Human Body Blockage [2]
• Blockage effect due to head-to-hand (purple in slide 6)– Whenever a person watches his smart-phone in super-dense
environments, his own head is likely to block the link to AP many times, which has been a problem even in nowadays
• Blockage effect due to other people (red in slide 6)– In most of HEW usage models, many people are very crowded
within a limited area with super high density more than 0.5 person/m2 or 1.0 person/m2.
– In these environments, we can hardly expect an LOS link between AP and STA due to blockage effect from other human bodies, which seems to require additional path loss
Slide 7 Minho Cheong (NEWRACOM)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Additional Path-loss due to Human Body Blockage [2]
• Possible Supplements originally suggested before – Path loss = Path loss (current model) + delta (constant)– Add an additive (delta) due to human blockage to the current indoor
& outdoor channel model specifically in super-dense environments
• Work to do in the future– Need to measure & investigate the statistics of increased path loss
due to human body blockage in Wi-Fi super-dense environments• According to indoor or outdoor• According to density of STAs • According to location of AP (3 dimensional)
Slide 8 Minho Cheong (NEWRACOM)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Measurement of Signal Strength Variation
Slide 9 Minho Cheong (NEWRACOM)
• Measurement spot: Seoul Express Bus terminal (indoor)– According to population density (all the other conditions same)
• at 0.05 people/m2, 0.25 people/m2, 0.5 people/m2
– Measured signal power, noise power and SNR in a time-average• During several seconds (a population density can be preserved)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Observations from the Measurement
• Differently from our original expectations,– Additional channel loss in super-dense environments seems to be
logarithm-linearly proportional to the population density
Slide 10 Minho Cheong (NEWRACOM)
Mar. 2014
doc.: IEEE 11-14/0113r1
Submission
Observations from the Measurement (2)
Mar. 2014
Slide 11 Minho Cheong (NEWRACOM)
doc.: IEEE 11-14/0113r1
Submission
Temporary Conclusions
• Supplements to additional channel loss due to human-blockage effect in super dense Wi-Fi environments– Logarithmic-linearly proposal to the population density with a
threshold as in slide 11.– For values of α, β and γ , enough number of measurements
campaigns & related statistical analysis (such as linear regression) may be needed.
– Values of α, β and γ may be dependent on indoor/outdoor, 3-dimensional deployment directions of AP
• We expect more measurement campaigns by other companies (for multiple Wi-Fi environments) to check the conclusions
Mar. 2014
Slide 12 Minho Cheong (NEWRACOM)
doc.: IEEE 11-14/0113r1
Submission
References
• [1] 11-09-0161-02-00ac-802-11ac-usage-model-document[2] 11-13-1113-00-0hew-channel-modeling-for-dense-Wi-Fi-environments
Mar. 2014
Slide 13 Minho Cheong (NEWRACOM)