In view of future dense and complex space network topologies, the management of congestion control is a prominent issue that deserves a particular attention. Given the challenging peculiarities of the interplanetary environment, this paper focused on the advantages offered by storage-based routing and on potentials of implementing Random Early Detection (RED) and Explicit Notification (ECN) mechanisms within the Delay Tolerant Network (DTN) architecture. In this light, solutions relying upon the aforementioned concepts have been designed and tested. Preliminary results show that combination of RED and ECN schemes with network-selection strategies for storage-based routing is really promising and outperform other solutions in terms of reliability, network resource utilisation and power consumption.