Issue link: https://read.uberflip.com/i/1428308
TR007 Developing LoRaWAN® Devices © 2021 LoRa Alliance® Page 23 of 26 The authors reserve the right to change specifications without notice. 3.18 Transmit Power 721 3.18.1 Description 722 To efficiently support the greatest variety of operating conditions it is useful for the end- 723 device to implement transmit power control across the widest reasonable range of power 724 levels which are specified in [RP002]. 725 Different regulatory regions support a variety of maximum transmit power levels. These may 726 be specified as antenna port conducted power, EIRP, power-spectral-density or other 727 measured values. 728 3.18.2 Recommended Practice 729 End-devices SHOULD support the highest practical transmit power in the region they are 730 certified to operate in. 731 End-devices SHOULD support the full range of power control specified in [RP002]. 732 End-device manufacturers designing devices targeted (or which may be targeted in future) 733 for multiple regulatory regions SHOULD design them to support the maximum practical 734 transmit power across those regions. 735 From version [TS001-1.0.4], a minimum power control range is mandatory. An end-device 736 SHALL support a minimum power control range of 14dB, or support a minimum transmit 737 power of 2dBm. 738 3.19 Class B/C Cell Update 739 3.19.1 Description 740 End-devices operating in Class B or Class C mode may need to occasionally inform the 741 network of which gateway (cell) to use for downlinks. While Class A uplinks continuously 742 inform the network as to which gateways are best used for downlinks, end-devices receive 743 Class B/C downlinks without an immediately preceding uplink. As the RF conditions or 744 network change or if the end-device moves, it is necessary for the end-device to send an 745 uplink to inform the network that a new set of gateways may need to be selected for 746 downlinks, however, it is best to minimize the number of uplinks used solely for this purpose. 747 If the network is not informed of the end-device's new cell location, Class B and Class C 748 downlinks may be transmitted by gateways which are not within range of the end-device. 749 3.19.2 Recommended practice 750 End-devices MAY use Class B beacons (regardless of the end-device Class) to detect 751 changes in the set of gateways connecting it to the network. Class B beacons MAY contain 752 gateway specific fields, including GPS coordinates of the gateway, a NetID and GatewayID 753 or other proprietary extensions. If this technique is used to detect cell changes, the end- 754 device SHOULD keep a list of recent gateway identifiers. This list SHOULD be sized to 755 track a reasonable number of local gateways. If a new gateway identifier is added to the list 756 the end-device SHOULD send an uplink frame to allow the network to update its cell 757 location. The end-device SHOULD age entries out of this list if no beacon containing the 758 entry's gateway id has been received in a long period of time. 759