Impact of Node Density on the QoS Parameters of Routing Protocols in Opportunistic Networks for Smart Spaces

Table 3

Performance metrics used in OppNet simulation.

S. no.	QoS parameters	Mathematical notations	Brief description
1	Number of participating nodes	n	Involves the total number of participating nodes in the network including those nodes also which are not participating in communication at any instance.
2	Message delivered		The total number of messages successfully delivered by the sender node to the destination node via the intermediate node. The number of intermediate nodes may vary following network topology and the distance between sender and receiver end.
3	Message dropped		The total number of messages lost due to any reason during communication between the sender node and receiver node in opportunistic networks.
4	Delivery probability		It is the probability of successful delivery of a data packet originated from source node directed towards destination node via intermediate nodes and is a pointer of how solid the network is as far as message delivery.
5	Overhead ratio		The overhead ratio suggests the utilization of network resources and buffer space because of the utilization of different duplicates of a similar message to expand delivery possibilities.
6	Average latency		The average time is taken by a data to be completely disseminated from a source node to the destination node. Less average latency denotes a good characteristic of a good routing protocol.
7	Average hop count		The average number of an intermediate number of nodes traveled by data from source to destination in a predefined duration of time.
8	Average buffer time		It is the average time brought about by all messages that are delivered relinquished/stranded at the intermediate node buffers.