3/29/20141
Project IEEE 802.20 Working Group on Mobile Broadband Wireless Access
<http://grouper.ieee.org/groups/802/20/>
...
1. Introduction
The channel model document [1] has recommended the path loss model to be used. But
in terms of the frequen...
pp 27[1]
“
1. The microcell NLOS pathloss is based on the COST 231 Walfish-Ikegami NLOS
model with the following parameter...
Path Gain
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-80
-60
-40
-20
0
35
135
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335
435
535
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735
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1.) Adopt the proposed categories of path loss and the corresponding formulation
2.) When FDMA is used in any form in a pr...
1.) Adopt the proposed categories of path loss and the corresponding formulation
2.) When FDMA is used in any form in a pr...
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Ieee 802.20 working group on mobile broadband wireless access

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Ieee 802.20 working group on mobile broadband wireless access

  1. 1. 3/29/20141 Project IEEE 802.20 Working Group on Mobile Broadband Wireless Access <http://grouper.ieee.org/groups/802/20/> Title Issues on Path Loss Model Date Submitted 2005-05-16 Source(s) David Huo 67 Whippany Road Whippany, NJ 07981 Voice: +1 973 428 7787 Fax: +1 973 386 4555 Email: dhuo@lucent.com Re: Evaluation Criteria Abstract This document points out the inconsistency of the path loss models with regard to the frequency dependence. Purpose Discuss and adopt Notice This document has been prepared to assist the IEEE 802.20 Working Group to accomplish the simulator calibration process. Release The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.20. Patent Policy The contributor is familiar with IEEE patent policy, as outlined in Section 6.3 of the IEEE- SA Standards Board Operations Manual <http://standards.ieee.org/guides/opman/sect6.html#6.3> and in Understanding Patent Issues During IEEE Standards Development <http://standards.ieee.org/board/pat/guide.html>.
  2. 2. 1. Introduction The channel model document [1] has recommended the path loss model to be used. But in terms of the frequency dependence the requirement is not consistent. Considering the potential bandwidth of MBWA (up to 3.5 GHz), the frequency dependence of the path loss is an important issue and deserves being clarified, so that evaluation can be performed pertinent to the operating frequency and bandwidth of the proposed systems. We start we some text change for the channel model document in the following. 2. Concerned Text and Proposed Addition Addition of a new section titled Path Loss Models The rational is the following: Pp 26[1] “ 1. The macrocell pathloss is based on the modified COST231 Hata urban propagation model: ( ) ( ) 10 10 10 10 [ ] 44.9 6.55log log ( ) 45.5 1000 35.46 1.1 log ( ) 13.82log ( ) 0.7 bs ms c bs ms d PL dB h h f h h C = − + + − − + + where bsh is the BS antenna height in meters, msh the MS antenna height in meters, cf is the carrier frequency in MHz, d is the distance between the BS and MS in meters, and C is a constant factor (C = 0dB for suburban macro and C = 3dB for urban macro). Setting these parameters to bsh = 32m, msh = 1.5m, and cf =1900MHz, the path-losses for suburban and urban macro environments become, respectively, 1031.5 35log ( )PL d= + and 1034.5 35log ( )PL d= + . The distance d is required to be at least 35m. “ Assume 32 meters for base station antenna and 1.5 meter for the mobile antenna for the macrocell environments and use [macrocell.suburban] PL(dB) =33.81*log10(fc)-79.4+ 35.04log10(d); [macrocell.urban] PL(dB) =33.81*log10(fc)-79.4+3+35.04*log10(d) 2
  3. 3. pp 27[1] “ 1. The microcell NLOS pathloss is based on the COST 231 Walfish-Ikegami NLOS model with the following parameters: BS antenna height 12.5m, building height 12m, building to building distance 50m, street width 25m, MS antenna height 1.5m, orientation 30deg for all paths, and selection of metropolitan center. With these parameters, the equation simplifies to: PL(dB) = -55.9 + 38*log10(d) + (24.5 + 1.5*fc/925)*log10(fc). The resulting pathloss at 1900 MHz is: PL(dB) = 34.53 + 38*log10(d), where d is in meters. The distance d is at least 20m. A bulk log normal shadowing applying to all sub-paths has a standard deviation of 10dB. The microcell LOS pathloss is based on the COST 231 Walfish-Ikegami street canyon model with the same parameters as in the NLOS case. The pathloss is PL(dB) = -35.4 + 26*log10(d) + 20*log10(fc) The resulting pathloss at 1900 MHz is PL(dB) = 30.18 + 26*log10(d), where d is in meters. The distance d is at least 20m. A bulk log normal shadowing applying to all sub-paths has a standard deviation of 4dB.” Assume base station antenna 12.5 meters and mobile station 1.5 meter for microcell environments and use [microcell.los] PL(dB)= -35.4 + 20*log10(fc)+26.0*log10(d) [microcell.nlos ] PL(dB)= -55.9 + (24.5 + 1.5*fc/925.)*log10(fc)+ 38.0*log10(d) Pp27 [1] “ The following assumptions are made for the indoor pico-cell environment. 1. The indoor path loss is based on the COST 231 model: 2 0.46 1 10( ) 37 30log 18.3 n n PL dB R n +  − ÷ +  = + + where R is the distance between BS and MS in meters, n is the number of penetrated floors (n=4 is an average for indoor office environment).” No specification of heights for the base station and mobile station for indoor environment and use [indoor] PL(dB) =37+18.3+30.0*log10(d) 3
  4. 4. Path Gain -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 35 135 235 335 435 535 635 735 835 935 1035 1135 1235 1335 1435 1535 1635 1735 1835 1935 distance (meter) gain(dB) free space micro.nlos micro.los macro.suburban macro.urban indoor Figure: Path gains for different environments as compared with free space for fc=2 .0 GHz 3.Further Issues All reference to path loss should be made to the new section. Remove path loss models that does not contain frequency as parameter. As 4 of the five models are continuous functions of carrier frequency, it is important to specify the applied bandwidth to ensure a fair comparison of the simulation results. This is not only necessary for the path loss but also for the fading process, where the Doppler spectrum depends on the frequency, too. 4. Recommendation 4
  5. 5. 1.) Adopt the proposed categories of path loss and the corresponding formulation 2.) When FDMA is used in any form in a proposal, the corresponding evaluation shall use the correct central frequency for each channel. 3.) When FDMA is not used, the simulation shall use central frequency for channel with bandwidth less than 5 MHz to compute the path loss and Doppler frequency. For proposal deploying frequency band wider than 5 MHz, methods of modeling the path loss and fading need be proposed to and reviewed by IEEE 802.20 5. Reference [1] Channel Models for IEEE 802.20 MBWA System Simulations – Rev 08r1 5
  6. 6. 1.) Adopt the proposed categories of path loss and the corresponding formulation 2.) When FDMA is used in any form in a proposal, the corresponding evaluation shall use the correct central frequency for each channel. 3.) When FDMA is not used, the simulation shall use central frequency for channel with bandwidth less than 5 MHz to compute the path loss and Doppler frequency. For proposal deploying frequency band wider than 5 MHz, methods of modeling the path loss and fading need be proposed to and reviewed by IEEE 802.20 5. Reference [1] Channel Models for IEEE 802.20 MBWA System Simulations – Rev 08r1 5

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