Issue link: https://read.uberflip.com/i/1423190
LoRa Alliance ® Whitepaper Page 16 of 49 LoRaWAN ® Gateways Radio Coexistence Issues and Solutions Copyright ©2021 LoRa Alliance, Inc. All rights reserved. www.lora-alliance.org • Home base stations are characterized by requirements derived from femto-cell scenarios. Home BS are used in residential settings to improve mobile network coverage and quality of service. This document focuses on the wide-area BS (rural and suburban areas) and medium- range BS (urban areas), which inherently cause more coexistence issues with LoRaWAN gateways. 3.3.2 OUTPUT POWER/EIRP The output power of LTE BS depends on the BS class, as follows: Figure 13: LTE Base station rated output power As indicated in the note, there is no upper limit for the wide-area BS. However, it is generally considered that 48dBm is the maximum output power. As stated in §3.2.1, the LTE antenna gain may vary from 15dB to 20dB, so EIRP may reach up to 48 + 20 = 68dBm for wide-area BS. For medium-range BS, the EIRP is limited to +58dBm. 3.3.3. ADJACENT CHANNEL LEAKAGE RATIO According to [5], the adjacent channel leakage power ratio (ACLR) minimum requirement is: • For Category A wide-area BS, either 45dB or the absolute limit of -13dBm/MHz shall apply, whichever is less stringent. • For Category B wide-area BS, either 45dB or the absolute limit of -15dBm/MHz shall apply, whichever is less stringent. • For medium-range BS, either 45dB or the absolute limit of -25 dBm/MHz shall apply. Considering a wide-area BS, the output power generated in the adjacent channel is therefore: 48dBm - 10*Log(10MHz/1MHz) - 45dB = -7dBm in 1MHz RBW = -17dBm in 100KHz RBW