| Initialization |
| : The sensor node to be congested |
| : The predecessor node 1-hop away from |
| : The forwarding node of |
| : A set of sensor nodes on an active route |
| TTL: Time to live value |
| BID: Broadcast Identifier of the Route Request |
| : Neighbours of sensor node, |
| : Source and Destination nodes |
| Ripple-Based Search Mechanism |
| () IF receives notification from then |
| () It sends notification to |
| () IF receives notification then |
| () broadcasts the Request with S, D, BID, and Till TTL = 4-hops |
| () FOR each sensor node , in |
| () IF () OR () AND TTL ! = 0 then |
| () Discard the request |
| () ELSE IF () && () && () && (TTL! = 0) then |
| () Add reverse route entry |
| () Add forward route entry |
| () Send Reply towards |
| () ELSE IF () then |
| () Add reverse route entry |
| () Add forward route entry |
| () Broadcast Notification Message |
| () ELSE IF () then |
| () Send a Unicast message to to re-discover the route |
| () END IF |
| () Decrement TTL by 1 |
| () END FOR |
| () END IF |
| () END IF |
