Resource allocation strategies for new connections in QoS multi-domain networks with signaling capabilities

Before accepting a new connection in QoS networks we need to check if the amount of required resources is available on the path from the source to the destination. In the case of QoS multi-domain networks, we need to make resource reservations in each domain on that path, as it has a place e.g. in EuQoS system. Choosing optimal strategy for resource reservations in such a network is a very important issue since it has great impact on the system effectiveness. In this paper we are going to present, evaluate and compare three strategies for resource allocations for new connections that are based on: (1) per flow treatment by each domain, (2) per flow treatment only by ending domains while using resource pre-reservations in transit domains, and (3) an intermediate approach that is based on partitioning the resources in transit domains into two separate pools - each pool is fully booked for the connections that are handled according to (1) and (2), respectively. For comparative studies of the above-mentioned strategies we are going to present the simulation results corresponding to such parameters as link utilization, probability of call blocking as well as required signaling in transit domains. Finally, we argue that the strategy (3) overcomes the strategies (1) and (2).