BS ISO/IEC 17821:2015 pdf download-Information technology — Specification of low power wireless mesh network over channel-hopped TDMA links.
6.1 Starting the LPWMN 6.1.1 Starting a link network The gateway router which is not currently joined to a link network shall attempt to establish a new LPWMN. When the next higher layer of the device issues the DLN-START-NETWORK.request primitive, the procedure to establish a new LPWMN is initiated. If the device is not the gateway router or is joined to a link network, the DLNE shall terminate the procedure and notify the next higher layer of the illegal request by issuing the DLN-START-NETWORK.confirm primitive with the Status parameter set to INVALID_ REQUEST. The DLNE shall reset the MAC sublayer by issuing the MLME-RESET.request primitive with the SetDefaultPIB parameter set to TRUE. The DLNE shall collect the data on the wireless environments and neighbour networks by requesting that the MAC sublayer performs an energy detection scan and an active scan in succession. The DLNE issues the MLME-SCAN.request primitive with the ScanType parameter set to ED and the ScanChannels parameter set to the ScanChannels parameter of the DLN- START-NETWORK.request primitive. On receipt of the results via MLME-SCAN.confirm primitive, the DLNE shall select the channels, whose energy levels are beyond an acceptable level, at most the number of channels specified in the HoppingSequenceLength parameter of the DLN-START-NETWORK. request primitive. The DLNE issues the MLME-SCAN.request primitive with the ScanType parameter set to ACTIVE and the ScanChannels parameter set to the ScanChannels parameter of the DLN-START- NETWORK.request primitive. On receipt of the results via MLME-SCAN.confirm primitive, the DLNE shall review the PANDescriptorList parameter. The DLNE collects the information on the neighbour IEEE 802.15.4-2011 PANs: the PAN identifier, channel number and channel page, superframe specification, and the time at which the beacon frame was received.