Whitepapers

LoRaWAN® Gateways: Radio Coexistence Issues and Solutions

Issue link: https://read.uberflip.com/i/1423190

Contents of this Issue

Navigation

Page 28 of 49

LoRa Alliance ® Whitepaper Page 28 of 49 LoRaWAN ® Gateways Radio Coexistence Issues and Solutions Copyright ©2021 LoRa Alliance, Inc. All rights reserved. www.lora-alliance.org 3.7.1 EUROPEAN USE CASE We consider in this use case the mixing of the 863 – 870MHz LoRa band with LTE bands 8 and 20. IMD3 products are generated in B20 UL/DL and B8 UL/DL bands. The estimated IMD3 products at the receiver's ports are: F1 F2 IM3 Left IM3 Right IM3 at LTE BS Receiver Port IM3 at GW LTE Receiver Port 869.525MHz (27dBm) 925 – 960MHz (LTE 900 DL) LTE 800 DL -40dBm/100KHz -81dBm/100KHz N/A LTE 800 DL -75dBm/100KHz 880 – 915MHz (LTE 900 UL) LTE 800 UL/DL -57dBm/100KHz LTE 900 UL -115dBm/100KHz LTE 800 UL -102dBm/100KHz LTE 900 UL -150dBm/100KHz LTE 800 DL -92dBm/100KHz 832 – 862MHz (LTE 800 UL) LTE 800 UL/DL -115dBm/100KHz LTE 900 UL -57dBm/100KHz LTE 800 UL -150dBm/100KHz LTE 900 UL -102dBm/100KHz LTE 900 DL -140dBm/100KHz 791 – 821MHz (LTE 800 DL) -81dBm/100KHz LTE 900 UL/DL -40dBm/100KHz LTE900 UL -85dBm/100KHz LTE900 DL -75dBm/100KHz 863-870MHz (14dBm) 925 – 960MHz (LTE 900 DL) LTE 800 DL -66dBm/100KHz -94dBm/100KHz N/A LTE 800 DL -101dBm/100KHz 880 – 915MHz (LTE 900 UL) LTE 800 UL/DL -83dBm/100KHz LTE900 UL -128dBm/100KHz LTE 800 UL -128dBm/100KHz LTE 900 UL -173dBm/100KHz LTE 800 DL -118dBm/100KHz 832 – 862MHz (LTE 800 UL) LTE 800 UL/DL -128dBm/100KHz LTE900 UL -83dBm/100KHz LTE 800 UL -173dBm/100KHz LTE 900 UL -128dBm/100KHz LTE 900 DL -163dBm/100KHz 791 – 821MHz (LTE 800 DL) -94dBm/100KHz LTE 900 UL/DL -66dBm/100KHz LTE900 UL -111dBm/100KHz LTE900 DL -101dBm/100KHz IMD3 products due to LTE BS in bands 8 and 20 may significantly desensitize the LTE BS in bands 8 and 20. The LTE backhaul of the gateway may be also impacted. Therefore, a band-pass filter is required on the gateway Tx path to attenuate LTE 900 DL (B8) and LTE 800 DL (B20) signals. The IMD products at the LoRa RF port can reach up to -40dBm/100KHz, which is very marginal to ETSI EN 300 200 specification (-36dBm/100KHz). A cavity filter is therefore required in this case. It must provide 40dB or more attenuation in the LTE 900 DL and LTE 800 DL bands. 3.7.2 NORTH AMERICA USE CASE We consider in this use case mixing of the 923 – 928MHz LoRa band with LTE bands 27, 5, 12, and 13. The IMD3 products are generated in the B27 UL/DL, B13 UL, and B5 UL/DL bands. The estimated IMD3 products at the receiver's ports are:

Articles in this issue

Links on this page

view archives of Whitepapers - LoRaWAN® Gateways: Radio Coexistence Issues and Solutions