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In detail, each node scans SCH 1 through SCH 6 and allocates the channel with the lowest RSSI value as the receiving channel. To avoid overlapping of channels with nearby nodes, the node generates a noise through the selected receiving channel until channel allocation of other nodes is completed. After that, control messages of RBMRP are transmitted in the CCH period. The information of the node including receiving channel is delivered by a Hello message. And the route discovery to the gateway starts with PREQ due to RANN. When the PREQ is transmitted, each node adds RSSI of the receiving channel for downlink routing and uplink routing. The node received PREQ selects the downlink route to the best path with the least RSSI. When the gateway receives PREQ message, it compares the uplink metrics and transmits the PREP to the best path with the least RSSI. Like downlink routing, the node received PREP add the uplink route to the gateway. And through the Hello message, the RSSI of the neighbor node and the routing metric to the gateway is updated. If the updated routing metric exceeds the threshold, the node sends PERR and re-discover the route to the gateway
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IEEE/ICACT20210196 Slide.12
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