Issue link: https://read.uberflip.com/i/1539840
Developing LoRaWAN Devices Technical Recommendation TR007-1.1 ©2021-2025 LoRa Alliance ® Page 22 of 28 The authors reserve the right to change documents without notice. 4.17.2 Recommended Practice 701 The end-device SHALL respect the lower of the two duty cycle limitations (LoRaWAN or 702 Regulatory). Most often, a LoRaWAN network will not set a duty cycle limitation, and the end- 703 device SHALL respect the regulatory duty cycle limitations. 704 4.18 Transmit Power 705 4.18.1 Description 706 To efficiently support the greatest variety of operating conditions, it is useful for the end-device 707 to implement transmit power control across the widest reasonable range of power levels, 708 which are specified in [RP002]. 709 Different regulatory regions support a variety of maximum transmit power levels. These may 710 be specified as antenna port conducted power, EIRP, power-spectral-density, or other 711 measured values. 712 4.18.2 Recommended Practice 713 End-devices SHOULD support the highest practical transmit power in the region they are 714 certified to operate in. 715 End-devices SHOULD support the full range of power control specified in [RP002]. 716 End-device manufacturers designing devices targeted (or which may be targeted in future), 717 for multiple regulatory regions SHOULD design them to support the maximum practical 718 transmit power across those regions. 719 In LoRaWAN 1.0.4+, a minimum power control range is mandatory. An end-device SHALL 720 support a minimum power control range of 14dB, or support a minimum transmit power of 721 2dBm. 722 4.19 Class B/C Cell Update 723 4.19.1 Description 724 End-devices operating in Class B or Class C mode MAY need to occasionally inform the 725 network about which gateway (cell) to use for downlinks. While Class A uplinks continuously 726 inform the network as to which gateways are best used for downlinks, end-devices receive 727 Class B/C downlinks without an immediately preceding uplink. As the RF conditions or network 728 change, or if the end-device moves, it is necessary for the end-device to send an uplink to 729 inform the network that a new set of gateways may need to be selected for downlinks, 730 however, it is best to minimize the number of uplinks used solely for this purpose. 731 If the network is not informed of the end-device's new cell location, Class B and Class C 732 downlinks may be transmitted by gateways that are not within range of the end-device. 733