the present invention provides a method for operating a network system and a network system operated correspondingly for improving network resource reservations and allocations . information included in signaling messages of a given protocol , like the resource reservation protocol , which do not provide information about the actual communications status in the network . according to the invention , information concerning the communications / service quality of the network are collected from all over the network . in particular , such information is collected from all network domains and their routers , respectively . the collected information is communicated in the network by extending the signaling messages obtained on the basis of the given protocol . utilizing the collected information , service quality negotiations between a server and its client are improved . this improvement can be achieved for network systems comprising a network domain serving a single client , and multicasting networks . furthermore , the present invention provides a solution for pre - reservation of network resources which avoids an unnecessary reservation of network resources and a waste of network resources for subsequent resource allocations .