Performance evaluation of an efficient fault tolerant service discovery protocol for vehicular networks

A Modified Fault Tolerant Location-Based Service Discovery Protocol for Vehicular Networks

“…We assume that each RR can be aware of its adjacent RR or its link failure by using a failure detection algorithm which is proposed in [7]. Each RR that detects failure in its adjacent and wants to forward a service request sets a force to broadcast flag high.…”

“…Any road component that receives a message, checks its "force to broadcast" flag, if it is in high state, it broadcast the message without even its distance to RI is larger than the sender. It guaranties that the service request message reaches the associated service provider [7].…”

“…In other words when a RR detects a failure it sets the flag high and broadcast it. The other road components receiving this message check this flag if it is high, they broadcast it, otherwise they do as they supposed with respect to distance to RI [7]. This phase of this algorithm which is proposed in [7] fails in this scenario: assume that a RR in the RI is elected as leader because it is the nearest RR to the center of the RI.…”

“…The other road components receiving this message check this flag if it is high, they broadcast it, otherwise they do as they supposed with respect to distance to RI [7]. This phase of this algorithm which is proposed in [7] fails in this scenario: assume that a RR in the RI is elected as leader because it is the nearest RR to the center of the RI. The other RRs in the RI send their local service replies to their parents and they add their local reply to it and forward it to the leader.…”

“…Our proposed protocol is based on FTLocVSDP [7] which is proposed by Abrougui et al, recently. They have considered fault tolerance features in their work and it has a good performance at most of conditions.…”