| if round == 1 then |
| BS broadcasts Level-Msg containing routing_level = 1. |
| if SN receives the broadcasting message then |
| if Message is Level-Msg then |
| if routing_level of node != 0 then |
| if routing_level of node > routing_level within received message then |
| Update routing_level of SN |
| if Node is CH then |
| routing_level routing_level + 1 |
| Broadcast new Level-Msg (ID, routing_level) |
| end if |
| end if |
| Else |
| Update routing_level of SN with routing_level within received message |
| end if |
| else if Message is Level-Request-Msg then |
| if routing_level of node != 0 then |
| Send Reply-Request-Msg (ID, routing_level) to the requested SN |
| end if |
| End |
| else |
| Waiting for Level-Msg when T1 is expired |
| if Node is CH then |
| Broadcast Level-Request-Msg (ID) |
| Waiting for Level-Reply-Msg when T2 is expired |
| if Node receive Level-Reply-Msg then |
| if Node is CH then |
| Update routing_level of SN with routing_level within received message |
| routing_level routing_level + 1 |
| Broadcast new Level-Msg (ID, routing_level) |
| end if |
| Else |
| Waiting for Level-Reply-Msg when T3 is expired |
| routing_level 100 |
| end if |
| Else |
| Waiting for Level-Msg when is expired |
| routing_level 100 |
| end if |
| end if |
| end if |
