Ad-hoc networks

1. Course Title: Adhoc & Sensor Based Networks
Code: ECE752
Made By :
Name :Jasleen Kaur
Class: M.Tech (E&C)
Enroll. No . A2315320007
Topic : ATCP (Ad-Hoc Transport Layer
Protocol)

3. 1. Packet loss due to high BER or
collision
2. Route changes due to node
mobility
3. Network partitions
4. Out-of-order packets
5. Congestion
6. Congestion window size
adjustment
2
3
Issues Addressed by ATCP

4. • ATCP is a thin layer that is layered between TCP and IP Sender’s
• ATCP States: Normal, Disconnected, Congested, and Loss
• TCP Sender states: persist state, congestion control state and retransmission state.
• Standard TCP is maintained on receiving a ICMP “Destination Unreachable”
messages, the sender enters the persist state.
ATCP : Ad-Hoc Transport Layer Protocol

5. 1. Loss State

6. 2. Congestion State

7. 3. Disconnected State

8. ATCP Diagram

9. Pros :
• Maintenance of end-to-end TCP semantics
• Compatibility with traditional TCP
• Invisibility to TCP
Cons:
• Dependency on the network layer protocol to detect route
changes and partitions
• Addition of a thin ATCP layer to TCP
Pros and Cons of ATCP