Replica Distribution and Retrieval

Scenarios

We extensively simulated the behavior of REDMAN RD and RR protocols over wide-scale deployment scenarios. In fact, to validate the scalability of the proposal, it is necessary to evaluate RR in challenging wide-scale provisioning environments with several hundreds of mobile nodes, which we have simulated on top of ns-2.

Scenario: Square deployment area 400 nodes (side=1.7km) with 400 randomly positioned nodes. The dense MANET diameter, i.e., the longest minimum path between two nodes belonging to the dense region, is in most cases equal to 12.

The simulations presented in the following have three main goals: i) to evaluate the accuracy of the SID RR strategy depending on different parameter tuning; ii) to determine SID network overhead and compare it with the other discussed RR solutions; iii) to assess the SID robustness in the case of node mobility.

Parameters
Parameters were set as follows (for parameters related to other protocols refer to the protocols' pages):

Paramter	Value
Discovery Delay	3 s
Participant Advertisement Interval	20 s
Participant Advertisement Delay	3 s
Hello Period	100 s
Check Hello Period	110 s

If not differently specified, we have used default ns-2 values for all simulation parameters, e.g., constant 250m circular transmission ranges, 802.11b MAC layer and bi-directional connectivity.