1. MPTCP Lower Layer Implementation & Measurements
Georg Hampel, Anil Rana, Thierry Klein
Bell Labs, Alcatel-Lucent

2. Host + LL MPTCP Impl Host + L4 MPTCP Impl Application Application
Relay
TCP
TCP
MPTCP
MPTCP
Subflow
Subflow IP IP IP IP
L1/L2
L1/L2
Packet in
Packet out
New Packets
Filter rules
Sequential processing  No payload buffering!

3. Priorities Handover Trials Mobility across middle-boxes (MBB & BBM)
Incremental deployment (MPTCP Proxy)
(Limited) Multipath support
Handover Trials
Lab Wi-Fi  Lab LTE
Wi-Fi + Corporate Nwk (NJ)  Carrier LTE
Wi-Fi + ISP (Manhattan Apt)  Carrier LTE
Wi-Fi + ISP (Manhattan Café)  Carrier LTE
Middle-box
traversal

4. LTE client Wi-Fi Carrier LTE ISP1 client Wi-Fi Corp Nwk ISP 2 ISP 3
NJ Lab
client
server
NJ Lab
Wi-Fi
Carrier
LTE
ISP1
NJ Lab
NY Apt
NY Cafe
client
server
NJ Lab
Wi-Fi
Corp Nwk
ISP 2
ISP 3

5. Lab Trial
LTE
NJ Lab
client
server
NJ Lab
Wi-Fi

6. Corporate Nwk
LTE
Carrier
client
ISP 1
server
Corp
Wi-Fi
On TELNET 

7. Manhattan Apartment
LTE
Carrier
client
ISP 1
server
ISP 2
Wi-Fi

8. Manhattan Cafe
LTE
Carrier
client
ISP 1
server
ISP 3
Wi-Fi

9. Corporate Environment
LTE
Carrier
client
ISP 1
server
Corp
Wi-Fi
Make before Break

10. Corporate Environment
LTE
Carrier
client
ISP 1
server
Corp
Wi-Fi
Make before Break

11. Corporate Environment
LTE
Carrier
client
ISP 1
server
Corp
Wi-Fi
Break before Make
Packet
Loss
Cross-Subflow Retransmissions

12. Problems with present MPTCP design
No inference from subflow ACK to data ACK:
 Should work if only one active subflow
Unnecessary overhead when only 1 active subflow
Conclusion: Enhance MPTCP design for mobility use cases