Method for the routing of data packets, among a plurality of network nodes (140, 150, 151, 152, 160) of a telecommunications network, while taking into account energy intensity regarding the transmission of such data packets among the plurality of network nodes (140, 150, 151, 152, 160), wherein at least one specific data packet is transmitted from a source network node of the telecommunications network to a destination network node of the telecommunications network, wherein this transmission involves a plurality of transmission hops between a preceding network node and a subsequent network node of the telecommunications network, respectively, wherein, regarding a specific transmission hop, the transmission of the at least one specific data packet from a specific preceding network node to a specific subsequent network node requires the at least one specific data packet to be routed wherein the method comprises the following steps: -- in a first step, an energy budget indication information is associated or applied to the at least one specific data packet, wherein the energy budget indication information or its information content is related to the energy intensity of the transmission of the at least one specific data packet, wherein the energy budget indication information comprises an energy-related indication, or a delay-related indication and an energy-related indication, comprising at least one of the following: -- an information indicative of the total energy budget, or the total delay budget and the total energy budget, associated to the at least one specific data packet, -- an information indicative of the energy budget, or the delay budget and the energy budget, taken by or associated to the considered transmission hop, -- an information indicative of the remaining energy budget, or the remaining delay budget and energy budget, after the considered transmission hop, -- an information indicative of the energy budget, or the delay budget and energy budget, per hop after the considered transmission hop, -- in a second step, subsequent to the first step, a routing and/or scheduling decision regarding the next hop is taken by the specific preceding network node in dependency on the energy budget indication information or its information content, indicating the available and/or residual energy budget, or the available and/or residual energy budget and delay budget, wherein the transmission of the at least one specific data packet is performed by the specific preceding network node, wherein the transmission of the at least one specific data packet from the specific preceding network node to the specific subsequent network node requires the at least one specific data packet to be -- routed by a router entity or functionality or -- scheduled by a scheduler entity or functionality, wherein the router entity or functionality and/or the scheduler entity or functionality is or are part of or associated to the specific preceding network node. -- in a first step, an energy budget indication information is associated or applied to the at least one specific data packet, wherein the energy budget indication information or its information content is related to the energy intensity of the transmission of the at least one specific data packet, wherein the energy budget indication information comprises an energy-related indication, or a delay-related indication and an energy-related indication, comprising at least one of the following: -- an information indicative of the total energy budget, or the total delay budget and the total energy budget, associated to the at least one specific data packet, -- an information indicative of the energy budget, or the delay budget and the energy budget, taken by or associated to the considered transmission hop, -- an information indicative of the remaining energy budget, or the remaining delay budget and energy budget, after the considered transmission hop, -- an information indicative of the energy budget, or the delay budget and energy budget, per hop after the considered transmission hop, -- in a second step, subsequent to the first step, a routing and/or scheduling decision regarding the next hop is taken by the specific preceding network node in dependency on the energy budget indication information or its information content, indicating the available and/or residual energy budget, or the available and/or residual energy budget and delay budget, wherein the transmission of the at least one specific data packet is performed by the specific preceding network node, wherein the transmission of the at least one specific data packet from the specific preceding network node to the specific subsequent network node requires the at least one specific data packet to be -- routed by a router entity or functionality or -- scheduled by a scheduler entity or functionality,