IBBT Tr@ins

WP6: Interworking

Daan Pareit

IBBT – IBCN – Ghent University

2

Interworking

NAT

DHCP

AAA

Train management

NOC

Internet

Local content

Mobility Management

Mobility Management

NAT

DHCP

AAA

Train management

NOC

Internet

Local content

Mobility Management

Mobility Management

Mobility Management Central Mobility Management Train

Tunnel management

QoS management

Monitoring

Tunnel management

PDF

Monitoring

QoS management

GatewayAggregation

unitBuffer

QoS-scheduler

Data analysis

GatewayAggregation

unitBuffer

QoS-scheduler

Data analysis

Handover protocol Handover protocol

Handover protocol

Two alternatives

Mobile IP (MIP)

Mobile Multi-Path SCTP (MMP-SCTP)

Train = a mobile router

Passengers = a mobile network

User devices don’t need to be

MMP-SCTP or MIP-aware

Handover protocol

MMP-SCTP vs MIP

MMP-SCTP has multihoming

MMP-SCTP has built-in reliability

MMP-SCTP has a higher overhead than MIP,

but a higher throughput in WLAN

IP

SCTP

CH

UN

K

TCP/

UD

P Passengerdata

IP

TCP/

UD

P Passengerdata

IP

CH

UN

K

TCP/

UD

P Passengerdata

IP

TCP/

UD

P Passengerdata

IP …

…

IN

MMP-SCTP

IPIP TCP/

UD

P Passengerdata

IP

TCP/

UD

P Passengerdata

IP …

OUT

MIP

Handover protocol

Handover protocol

0,0

5,0

10,0

15,0

20,0

25,0

30,0

35,0

40,0

0 500 1000 1500

Throughput(Mbps)

Passenger IP packet size (bytes)

L2 Throughput in a WLAN

mSCTP

MIP

Mobility Management Central Mobility Management Train

Handover protocol

Tunnel management

QoS management

Monitoring

Handover protocol

Tunnel management

Monitoring

QoS management

GatewayAggregation

unitBuffer

QoS-scheduler

Data analysis

GatewayAggregation

unitBuffer

QoS-scheduler

Data analysis

PDF

Policy Decision Function

Decides on interfaces to be used

Decision based on:

SNR, packet loss, traffic measurements

GPS, speed & management info

IEEE 802.21 MIH events and triggers

Load balancing, cost

Mobility Management Central Mobility Management Train

Handover protocol

Tunnel management

Monitoring

Handover protocol

Tunnel management

PDF

Monitoring

GatewayAggregation

unit

GatewayAggregation

unitBuffer

QoS-scheduler

Data analysis

QoS management

BufferQoS-

schedulerData

analysis

QoS management

Data analysis

buffer acceptors

Mappingmanager

schedulers

QoS

QoS-scheduler Buffer

shaper

shaper

5 QoS-classes:• Background: FTP• Best effort: Surfing, Email• Streaming: Video stream• Interactive: VoIP call• Priority: Crew Comm.

QoS classes are mapped on outgoing links(Load balancing)

Demo & questions

14