1. Deployable Multipath TCP
Designing and Implementing a
Deployable Multipath TCP
Taolei Wang, Chang Liu, Siyuan Feng

2. 01
Motivation & Goals
CONTENT 02
Design 03
Implementing

3. 01
Motivation & Goals

4. Cellular Network Mobile Device Server Wi-Fi
Multipath Network in Mobile Devices
Cellular Network
Mobile Device
Server
Wi-Fi

5. Multipath Network in Datacenter

6. 02
Design

7. Multipath TCP in the Stack
Application
Application
Socket
Transport
Multipath TCP
Network
Datalink
TCP1
TCP2
TCPn …
Physical

8. Connection Setup
SYN, MPTCP
SYN + ACK, MPTCP
ACK, MPTCP

9. Adding Subflow SYN, MP_JOIN(TokenB, RA) SYN/ACK, MP_JOIN(HMACB, RB)
ACK, MP_JOIN(HMACA)
ACK
HMACA = HMAC(Key=(KeyA+KeyB), Msg=(RA+RB))
HMACB = HMAC(Key=(KeyB+KeyA), Msg=(RB+RA))

10. Flow Control Subflow: 101 Data: 3 Subflow: 100 Data: 1 Subflow: 200

11. Loss! Flow Control Subflow: 101 Data: 3 Subflow: 102 Data: 2

12. Encoding

13. 03
Implementing

14. Implementing

15. Implementing
Why?

16. MPTCP over WiFi/3G
Packet-3
Packet-4
Packet-2
Packet-1

17. MPTCP over WiFi/3G
Packet-2
Packet-1
Packet-3
Packet-4

18. MPTCP over WiFi/3G
Packet-1
Packet-2
Packet-1
Packet-3
Packet-4

19. MPTCP over WiFi/3G
Packet-1
Packet-1
Packet-2
Packet-3
Packet-4

20. MPTCP over WiFi/3G

21. Taolei Wang, Chang Liu, Siyuan Feng
Thanks
Taolei Wang, Chang Liu, Siyuan Feng