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LoRaWAN® Gateways: Radio Coexistence Issues and Solutions

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LoRa Alliance ® Whitepaper Page 29 of 49 LoRaWAN ® Gateways Radio Coexistence Issues and Solutions Copyright ©2021 LoRa Alliance, Inc. All rights reserved. www.lora-alliance.org F1 F2 IM3 Left IM3 Right IM3 at LTE BS Receiver Port IM3 at GW LTE Receiver Port 923–928MHz 852 – 869MHz (LTE SMR DL) SMR UL 700c UL -78dBm/100KHz -34dBm/100KHz SMR UL -123dBm/100KHz 700c UL -123dBm/100KHz N/A 807 – 824MHz (LTE SMR UL) 700c UL -112dBm/100KHz -51dBm/100KHz 700c UL -157dBm/100KHz N/A 869-894MHz (LTE 850 DL) SMR UL/DL LTE 850 UL -78dBm/100KHz -34dBm/100KHz SMR UL -123dBm/100KHz LTE 850 UL -123dBm/100KHz SMR DL -113dBm/100KHz 824 – 849MHz (LTE 850 UL) SMR UL LTE 850 UL -112dBm/100KHz -51dBm/100KHz SMR UL -157dBm/100KHz LTE 850 UL -157dBm/100KHz N/A 777 – 787MHz (LTE 700c UL) 700a UL -112dBm/100KHz -51dBm/100KHz 700a UL -157dBm/100KHz N/A IMD3 products due to LTE BS in bands 27, 5, 12, and 13 may not cause any degradation of the LTE BS and LTE backhaul. IMD3 right product may be somewhat high (-34dBm/100KHz) but is compliant with 47 CFR FCC Part 15 specification. 3.7.3 APAC AND LATAM USE CASES We consider in this use case mixing of the 915 – 928MHz LoRa band with LTE bands 8, 5, and 28. The IMD3 products are generated in B27 UL/DL, B13 UL, and B5 UL/DL bands. The estimated IM3 products at the receiver port are: F1 F2 IM3 Left IM3 Right IM3 at LTE BS Receiver Port IM3 at GW LTE Receiver Port 915 – 928MHz 935 – 960MHz (LTE 900 DL) LTE 850 DL LTE 900 UL LoRa -78dBm/100KHz -34dBm/100KHz LTE 900 UL -123dBm/100KHz LTE 850 DL -113dBm/100KHz 890 – 915MHz (LTE 900 UL) LTE 850 UL/DL LTE900 UL -112dBm/100KHz LTE 900 DL -51dBm/100KHz LTE 850 UL -157dBm/100KHz LTE 850 DL -147dBm/100KHz LTE 900 DL -86dBm/100KHz 860 – 890MHz (LTE 850 DL) LTE 850 UL LTE 700 DL -78dBm/100KHz LTE 900 DL -34dBm/100KHz LTE 850 UL -123dBm/100KHz LTE 700 DL -113dBm/100KHz LTE 900 DL -69dBm/100KHz IMD3 products due to LTE BS in bands 8, 5, and 28 may not cause any degradation of the LTE BS but may impact LTE backhaul in LTE B8 DL. Also, IMD3 right product may be somewhat high (-34dBm/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 UL/DL and LTE 850 DL bands. 3.8 TOTAL POWER RECEIVED BY A LoRaWAN GATEWAY In urban areas, the LoRaWAN gateway may be surrounded by many LTE or high- speed packet access (HSPA) base stations. For example, three or four operators may

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