A method of allocating energy resources in a network signalling node during an interval of time the network signalling node having internal processing components for maintaining operation of the node and relaying components for relaying data between other nodes in the network. The method comprises determining an amount of energy available for use by the node during the interval, determining a willingness parameter that defines the willingness of the node to supply energy to the relaying components during the time interval, determining, based on the willingness parameter, a portion of the available energy to allocate to the internal processing components during the time interval; and allocating the remainder of the available energy to the relaying components.