A method for measuring interference on a channel of a wireless communication network in a node (104, 106, 108, 110, 112, 114) of the wireless communication network, said wireless communication network being a network where data and control packages flow along paths determined based on routing graphs, the routing graphs being used to determine routes for propagating the packets from node to node through the wireless communication network, the method comprising steps of: causing a receiver of the node (104, 106, 108, 110, 112, 114) to listen to a selected channel of the wireless communication network during a guard time period starting from a start of a listen/receive period; determining whether a packet transmitted across the wireless communication network is received on the selected channel during the guard time period starting from the start of the listen/receive period; and upon determining that no packet transmitted across the wireless communication network is received on the selected channel during the guard time period starting from the start of the listen/receive period, measuring a received signal strength on the selected channel at an end of the guard time period starting from the start of the listen/receive period, wherein: the node (104, 106, 108, 110, 112, 114) is synchronized with the wireless communication network and is scheduled, in accordance with a schedule of the wireless communication network, to listen to the selected channel during the guard time period; and the node (104, 106, 108, 110, 112, 114) is not scheduled, in accordance with a schedule of the wireless communication network, to listen to the selected channel during the listen/receive period, and the listen/receive period begins at a time at which another node (104, 106, 108, 110, 112, 114) of the wireless communication network is scheduled to listen to the selected channel in accordance with the schedule of the wireless communication network. causing a receiver of the node (104, 106, 108, 110, 112, 114) to listen to a selected channel of the wireless communication network during a guard time period starting from a start of a listen/receive period; determining whether a packet transmitted across the wireless communication network is received on the selected channel during the guard time period starting from the start of the listen/receive period; and upon determining that no packet transmitted across the wireless communication network is received on the selected channel during the guard time period starting from the start of the listen/receive period, measuring a received signal strength on the selected channel at an end of the guard time period starting from the start of the listen/receive period, wherein: the node (104, 106, 108, 110, 112, 114) is synchronized with the wireless communication network and is scheduled, in accordance with a schedule of the wireless communication network, to listen to the selected channel during the guard time period; and the node (104, 106, 108, 110, 112, 114) is not scheduled, in accordance with a schedule of the wireless communication network, to listen to the selected channel during the listen/receive period, and the listen/receive period begins at a time at which another node (104, 106, 108, 110, 112, 114) of the wireless communication network is scheduled to listen to the selected channel in accordance with the schedule of the wireless communication network. the node (104, 106, 108, 110, 112, 114) is synchronized with the wireless communication network and is scheduled, in accordance with a schedule of the wireless communication network, to listen to the selected channel during the guard time period; and the node (104, 106, 108, 110, 112, 114) is not scheduled, in accordance with a schedule of the wireless communication network, to listen to the selected channel during the listen/receive period, and the listen/receive period begins at a time at which another node (104, 106, 108, 110, 112, 114) of the wireless communication network is scheduled to listen to the selected channel in accordance with the schedule of the wireless communication network.