| VAA in source nodes |
| Input: State ; ACK; NACK; time |
| 1: Send bundle ; Set the retransmission timer according to equation (22); |
| 2: if Receive ACK of then |
| 3: Delete from the cache; |
| 4: Delete the retransmission timer ; |
| 5: end if |
| 6: if Receive NACK of OR then |
| 7: Retransmission ; |
| 8: Reset the retransmission timer ; |
| 9: end if |
| VAA in relay nodes |
| Input: State ; ACK; NACK; time |
| 1: Forward the bundle ; Set the retransmission timer according to equation (22); |
| 2: if Received ACK of then |
| 3: Replace with ; Start timer ; |
| 4: Delete the retransmission timer ; |
| 5: Calculate by (17); ACK; |
| 6: Forward ACK; |
| 7: end if |
| 8: if or Received //note: and were sent from the same source node. then |
| 9: Delete ; |
| 10: end if |
| 11: if Received NACK of OR =0 then |
| 12: Calculate by equation (17); |
| 13: Check whether decoded in the cache is correct; |
| 14: if decoded correctly then |
| 15: ACK; //note: Put into the ACK package. |
| 16: Retransmission ; Forward ACK; Reset the retransmission timer ; |
| 17: else |
| 18: NACK; //note: Put into the NACK package. |
| 19: Delete ; Forward NACK to source node ; |
| 20: end if |
| 21: end if |
