lower layer implementation measurements
TRANSCRIPT
MPTCP
Lower Layer Implementation &
Measurements
Georg Hampel, Anil Rana, Thierry Klein Bell Labs, Alcatel-Lucent
Host + L4 MPTCP Impl
TCP
Application
MPTCP
Subflow
L1/L2 L1/L2
TCP
IP
Relay
IP
Subflow
IP
Application
IP
MPTCP
Host + LL MPTCP Impl
Packet in New Packets Packet out
Filter rules
Sequential processing à No payload buffering!
Priorities 1. Mobility across middle-boxes (MBB & BBM)
2. Incremental deployment (MPTCP Proxy)
3. (Limited) Multipath support
Handover Trials • Lab Wi-Fi ó Lab LTE
• Wi-Fi + Corporate Nwk (NJ) ó Carrier LTE
• Wi-Fi + ISP (Manhattan Apt) ó Carrier LTE
• Wi-Fi + ISP (Manhattan Café) ó Carrier LTE
Middle-box traversal
client server
LTE
Wi-Fi
NJ Lab NJ Lab
client server
LTE
Wi-Fi
1. NJ Lab 2. NY Apt
3. NY Cafe NJ Lab
Carrier
1. Corp Nwk 2. ISP 2 3. ISP 3
ISP1
client server
LTE
Wi-Fi
NJ Lab NJ Lab
Lab Trial
0.00E+00
2.00E+06
4.00E+06
6.00E+06
8.00E+06
1.00E+07
1.20E+07
1.40E+07
1.60E+07
1.80E+07
2.00E+07
5 6 7 8 9 10 11 12 13Time (sec)
TCP
SEQ
No
(nor
mal
ized
)
Handover
Handover
MPTCP-based Mobility - Make before Break -
Wi-Fi
LTE(~12.5Mbps)
Wi-Fi(~50Mbps)
LTE
Handover
0.00E+00
2.00E+06
4.00E+06
6.00E+06
8.00E+06
1.00E+07
1.20E+07
1.40E+07
1.60E+07
1.80E+07
2.00E+07
18 20 22 24 26 28 30 32 34 36 38 40Time (sec)
TCP
SEQ
No
(nor
mal
ized
)
Handover
Handover
Handover
MPTCP-based Mobility - Make before Break -
Corporate Wi-Fi
Carrier LTE(~8Mbps)
Corporate Wi-Fi(~8Mbps)
Carrier LTE
client server
LTE
Wi-Fi
Carrier
Corp ISP 1
Corporate Nwk
On TELNET ü
client server
LTE
Wi-Fi
Carrier
ISP 2 ISP 1
0.00E+00
2.00E+06
4.00E+06
6.00E+06
8.00E+06
1.00E+07
1.20E+07
1.40E+07
1.60E+07
1.80E+07
2.00E+07
0 10 20 30 40 50 60 70 80 90 100 110 120Time (sec)
TCP
SEQ
No
(nor
mal
ized
)
Handover
Handover
MPTCP-based Mobility - Make before Break -
IPS-2 Wi-Fi
Carrier LTE(~0.6 Mbps)
ISP-2 Wi-Fi(~6.5 Mbps)
Carrier LTE
Handover
Manhattan Apartment
client server
LTE
Wi-Fi
Carrier
ISP 3 ISP 1
Manhattan Cafe
0.00E+00
2.00E+06
4.00E+06
6.00E+06
8.00E+06
1.00E+07
1.20E+07
1.40E+07
1.60E+07
1.80E+07
0 10 20 30 40 50 60 70Time (sec)
TCP
SEQ
No
(nor
mal
ized
)
Handover
Handover
MPTCP-based Mobility - Make before Break -
ISP-3 Wi-Fi
Carrier LTE(~ 1.3 - 5 Mbps)
ISP-3 Wi-Fi(~1.4 Mbps)
Carrier LTE
Handover
client server
LTE
Wi-Fi
Carrier
Corp ISP 1
Corporate Environment
Make before Break
9.04E+06
9.08E+06
9.12E+06
9.16E+06
9.20E+06
9.24E+06
9.28E+06
9.32E+06
29.4 29.45 29.5 29.55 29.6 29.65 29.7Time (sec)
TCP
SEQ
/AC
K N
o (n
orm
aliz
ed)
SEQ No - Wi-Fi ACK No - Wi-Fi SEQ No - LTE ACK No - LTE
Wi-Fi Subflow ACK with MP_PRIO option
MPTCP-based Mobility - Make before Break -
Carrier LTE
Corporate Wi-Fi
~150msec
client server
LTE
Wi-Fi
Carrier
Corp ISP 1
Corporate Environment
Make before Break
4.50E+06
4.55E+06
4.60E+06
4.65E+06
4.70E+06
4.75E+06
4.80E+06
4.85E+06
4.90E+06
25.1 25.15 25.2 25.25 25.3 25.35 25.4Time (sec)
TCP
SEQ
/AC
K N
o (n
orm
aliz
ed)
SEQ No - Wi-Fi ACK No - Wi-Fi SEQ No - LTE ACK No - LTE
LTE Subflow ACK with MP_PRIO option
MPTCP-based Mobility - Make before Break -
Corporate Wi-Fi
Carrier LTE
~ 80msec
1.38E+07
1.39E+07
1.39E+07
1.40E+07
1.40E+07
1.41E+07
1.41E+07
1.42E+07
1.42E+07
44.5 45 45.5 46 46.5 47 47.5 48 48.5 49 49.5 50
Time (sec)
TCP
SEQ
/AC
K N
o (n
orm
aliz
ed)
SEQ No - Wi-Fi ACK No - Wi-Fi SEQ No - LTE ACK No - LTE
MPTCP-based Mobility - Break before Make -
Corporate Wi-Fi
Carrier LTE
3 sec delay without SACK !
client server
LTE
Wi-Fi
Carrier
Corp ISP 1
Corporate Environment
Break before Make
Cross-Subflow Retransmissions Packet
Loss
Problems with present MPTCP design
1. No inference from subflow ACK to data ACK:
à Should work if only one active subflow
2. Unnecessary overhead when only 1 active subflow
Conclusion: Enhance MPTCP design for mobility use cases