Abstract: Time Slotted Channel Hopping (TSCH) is one of the access behavior techniques defined in the IEEE 802.15.4e standard.In TSCH mode,new nodes that want to join the network must listen to EBs containing network information,but the IEEE 802.15.4e standard does not give a broadcast policy related to EBs,and the broadcast policy of EBs isa key technology for new node quickly joining the network.For the decisive technology,although the current academic community has proposed many solutions,it relies heavily on network density,and does not consider the actual interference.To this end,the paper mainly studied the network formation process of TSCH in severe interference environment,and proposed a fast access scheme based on channel estimation (HSJCE).By designing a new slot frame structure and evaluating the channel quality,The new join node and synchronizer mechanisms were used to increase the number of EBs sent and select the best quality channel to send and listen to EBs.Experimental data and analysis have fully shown that the new join and synchronization mechanism greatly increases the probability for joining nodes successfully detecting EBs and does not depend on network density.Even in the case of severe congestion,HSJCE can provide shorter join time.

Key words: IEEE 802.15.4e, Internet of things, Network formation, Synchronization, Time-slotted channel hopping