Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
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1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Title: [Considerations of frequency resources for fast moving mobile backhaul] Date Submitted: [7 JAN, 2015] Source: [Minsoo KANG and Woojin Byun] Company [ETRI] Address [218 Gajeong-ro, Yuseong-gu, Daejeon, , KOREA] Voice:[ ], FAX: [ ], Abstract: [Considerations of frequency resources for fast moving mobile backhaul] Purpose: [To consider frequency resources for mobile wireless backhaul system of fast moving cells] Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P Slide 1
2 Considerations of frequency resources for fast moving mobile backhaul Slide 2
3 Outline Mobile backhaul for fast moving cells Frequency allocations Path losses System Link-budget for candidate frequencies Propagation characteristics in KTX(Korea Train express) Slide 3
4 Mobile backhaul for fast moving cells(1/2) Backhaul Link between RU and TE Access Link (inside vehicle) GW : Gateway DU : Digital Unit RU : Radio Unit TE : Terminal Equipment Wireless Backhaul Link Wireless Backhaul Link TE RU TE RU DU Public Internet GW Slide 4
5 Mobile backhaul for fast moving cells(2/2) Features New RAT for Mobile Wireless Backhaul Wireless Backhaul Link (Outside Vehicle) Data throughput (DL) OFDM based on mmwave 1 Gbps using 250-MHz bandwidth Spectral efficiency 4 bps/hz Mobility User Access Link (Inside Vehicle) 400 km/h Small Cell (WiFi or Femto) Slide 5
6 Frequency Allocations (1/2) Frequency allocations in USA and Europe FWS/DFRS Mobile backhaul Slide 6. FWS : Fixed Wireless Services. DFRS : Digital Fixed Radio Systems
7 Frequency Allocations (2/2) Frequency allocations in KOREA (Republic of) Wireless Transmission Link Other bands Frequency GHz 57-64GHz 71-76/81-86GHz. MSIP : Ministry of Science, ICT and Future Planning Drawback Large Antenna Oxygen & Precipitation Attenuation Precipitation(Rain, Snow etc) Attenuation Slide 7
8 Path Loss (1/4) Propagation Characteristics - Loss, Reflection, Refraction, Scattering Free-space Loss - ITU-R P.525.2, Calculation of Free-space Attenuation L æ 4pd ö 20logç = log fghz 20log dkm[ db] è l ø s = + Free Space Path Loss (@1.0 Km) 18 GHz db 27 GHz db 43 GHz db 80 GHz db Slide 8
9 Atmospheric Loss Path Loss (2/4) - ITU-R REC.676-7, Attenuation by Atmospheric Gases 15dB/km@60GHz 0.4dB/km@80GHz 0.3dB/km@43GHz 0.2dB/km@27GHz 0.1dB/km@18GHz. Pressure : hpa. Temp. : 15 o C. Water vapor density : 7.5g/m 3 Slide 9
10 Path Loss (3/4) Precipitation(Rain, Snow) Loss - ITU-R P.837-5, Characteristics of precipitation for propagation modeling Probability of rainfall in K-region (Units : mm/hour) Precipitation condition Frequency (GHz) Precipitation Loss (db/km) Slide 10
11 Rain climatic zones Path Loss (4/4) Slide 11
12 System Link Budget (1/2) Calculation of System link budget - 250MHz Bandwidth of noise power - Required C/N of 10.5dB for 16QAM - Link distance of over 1Km - Implementation margin of 3dB Freq. (GHz) Tx PWR (dbm) Tx Antenna Gain(dBi) Freespace Loss(dB) Gas Loss (db) Rain Loss (db) Rx Antenna Gain(dBi) Rx NF (db) RX PWR (dbm) Sensitivity (dbm) margin (db) Slide 12
13 System Link Budget (2/2) RX power vs. link distance GHz 27GHz 42GHz 80GHz sensitivity of 27GHz sensitivity of 43GHz RX Power(dBm) Link Distance(Km) Slide 13
14 Propagation characteristics in KTX(1/4) Simulation for Railroad with steel-frame structure in KTX - Ray tracing method - TX PWR of 20dBm, Antenna : 27GHz, 24dBi, 8x8 patch array type - RX Antenna is located center-line with 3.2m height RU_antenna(TX) Center-line 1000m 31m H D 9m 0m 3.2m 2.2m Zoom in scenario RU antenna location A Inside H : 5m, D :15m B Upside H : 10m, D : 0/15m C Beside H : 5/10m, D : 30/50/100m Slide 14 TX/RX Antenna pattern
15 Propagation characteristics in KTX(2/4) Scenario A (H=5m, D=15m) Slide 15
16 Propagation characteristics in KTX(3/4) Scenario B - Case 1 : H=10m, D=0m - Case 2 : H=10m, D=15m Slide 16
17 Propagation characteristics in KTX(4/4) Scenario C - Case 1 : H=5m, D=30m - Case 2 : H=5m, D=50m - Case 3 : H=5m, D=100m Slide 17
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