Quality-of-Service Support for Mobile Users using...

Institut für Telematik

Quality-of-Service Support for Mobile Users using NSIS

Roland Bless, Martin RöhrichtNetworking 2009, Aachen

R. Bless, M. Röhricht Institut für TelematikUniversität Karlsruhe (TH) www.tm.uka.de

1

Networking 2009, Aachen

Motivation

More and more resource demanding Internet applications and multimedia streams

video broadcasts, Voice-over-IP, IPTVInherent need for Quality-of-Service guarantees

across administrative domainssignaling protocol needed RSVP, NSIS

lacking mobility support of earlier signaling protocols like RSVP

Increasing popularity of mobile Internet devicesLaptops, mobile phones (iPhone), PDAsMobileIP allows for mobility in IP-based networks

adjusts data path transparently

Goal: Enable Quality-of-Service in mobile environments


2


Main Challenges

Resource reservations need to be setup on the new path

as quickly as possibleby using same/adapted QoS parametersrelease resource reservations on old path

Tight interworking needed between mobility management and signaling protocol

QoS signaling should work seamlessly with handovers across access nodes


3


MobileIP – Overview

MNHoA

LogicalFlow

LogicalFlow

TunnelFlow

TunnelFlow Path before

movementPath beforemovement

Route-optimizedflows

Route-optimizedflows

TunneledFlow

TunneledFlow

Handover

Non-Route Optimized

Flow

Non-Route Optimized

Flow

Cross-overnode

Cross-overnode

Foreign Network A Foreign

Network B

CNCN

MN New CoA

MN New CoA

MNOld CoA

MNOld CoA

HAHA AR1 AR1

AR3 AR3

Home Network

AR2 AR2

Correspondent Network


4


Next Steps in Signaling – Overview

Two-layer approachQoS NSLPNTLP, i.e. GIST

path-coupled signalingsignaling node discoverymessage transport (unreliable, reliable, secure)

TLS

UDPUDP TCPTCP SCTPSCTP DCCPDCCP

IPsec

IPv4/IPv6IPv4/IPv6

Signaling Application 1

(QoS)

Signaling Application 1

(QoS)

SignalingApplication 2

(NAT FW)

SignalingApplication 2

(NAT FW)

NSIS Signaling Layer(NSLP)

NSIS Transport Layer(NTLP)

General Internet Signalling Transport (GIST)

General Internet Signalling Transport (GIST)

Data flowQoS NSLP Signaling

http://www.preisvergleich.de/produkte/p,Fujitsu_Siemens_LIFEBOOK_S7020_(VFYS7020BT30DE)_Notebook,25897288.html

http://www.preisvergleich.de/produkte/p,Fujitsu_Siemens_LIFEBOOK_S7020_(VFYS7020BT30DE)_Notebook,25897288.html


5


Problems

NSIS protocol suite providesBasic mobility support: Session-ID remains constant even if a flow’s addresses changeRe-establishment of a reservation along a new path

Main problems to solveget triggers from mobility eventsget the current addressing informationprovide internal interfaces required to provide the necessary information

Solution focuses on MobileIPv6 as mobility management solution


6


Mobility Scenarios

Mobile node is sender and initiator/respondermobility events may trigger QoS NSLP actions

emit new RESERVE or QUERY messageQSPEC may be adapted, constant Session ID

Mobile node is receiver and initiator/responderdifficult to notify sender (CN), i.e. to signal in upstream direction

path not known in advancedifficult to determine cross-over node

flow address may changeprofile in first-hop router must be updated at sender side

available QoS at new Access Router may differre-negotiation along whole path required


7


Solutions to Mobility Problems

Mobility-aware applications (e.g., SIP) could provide the necessary triggersAssumption: MobileIPv6 as mobility management protocol

Provides transparent support for transport protocols/applications

Flow descriptor in QoS NSLP requires knowledge of current Care-of Address

contradicts use of Mobile IP that hides mobilityMobility is not transparent to QoS NSLP, e.g., must also consider

overhead added by MobileIP for QoS reservations (additional headers)source address selection

Main problem: notification of mobility events to QoS NSLP


8


FlowInfoService Module

New approach: add FlowInfoService moduleallows to request information about flows, e.g., current care-of-addresses, sizes of additional headers

must get updates if addresses change

TCPTCPSCTPSCTPUDPUDP

NSIS Protocols

MIPv6dMIPv6d

Flow Information

Service

Flow Information

Service

QoS NSLPQoS NSLP

GISTGIST

ApplicationApplicationFlow Info Request:(source addr, dest. addr)Flow Info Request:(source addr, dest. addr)

Reply/Notification:• Original flow=

(source addr, dest. addr) • Flow status= {none, tunneled,

routeopt.} • New flow= (source addr, dest. addr)• Overhead [bytes]

Reply/Notification:• Original flow=

(source addr, dest. addr)• Flow status= {none, tunneled,

routeopt.}• New flow= (source addr, dest. addr)• Overhead [bytes]


9


Evaluation – Setup

V 5 HAHA AR1 AR1

Home Network

AR1 Network

V 4 V 7 V 8

AR2 Network

AR3 Network

V 1

MNMN

Movement

AR2 AR2

V 13

V 14

V 15

V 16

V 17

CNCN

V 10

Virtual Environmenton PC 1

PC 2

Physical Gigabit Ethernet Link

VLANs

Smart Switch(FreeBSD 7)

PacketDumps

AR3 AR3


10


Evaluation – Performance Benchmarks I

50 consecutive movements of the MN between AR3 to AR2 to AR1 and backReservation setup and tear down of old path

Testcase AR1 Setup AR2 Setup AR3 Setup Tear downMN sender, sender- initiated

11.8 ms 26.9 ms 37.5 ms 20600 ms

CN sender, sender- initiated

13.3 ms 27.4 ms 40.3 ms 26.8 ms

MN sender, receiver- initiated

11.3 ms 29.0 ms 43.1 ms 28.0 ms

CN sender, receiver- initiated

12.5 ms 33.4 ms 42.2 ms 31.9 ms


11


Evaluation – Performance Benchmarks II

Receiver-initiated Reservationsetup delay for reservation from Access Router 1


12


Evaluation – Performance Benchmarks III

Delay for tear down of old reservation


13


Evaluation – Performance Benchmarks IV

Added additional delay between AR1/AR2 (50ms) and AR2/AR3 (25ms)Setup Delay Overhead ≤ 10%


14


Conclusion & Outlook

QoS support for mobile users viableNSIS QoS NSLP is prepared for mobilityMobility triggers requiredFlow Information ServiceLow additional overheadCode freely available: http://nsis-ka.org

OutlookRepeating measurements in real testbedSeamless QoS support: Anticipated HandoverRequires protocol extensionsOngoing implementation effort

http://nsis-ka.org/

Institut für Telematik

Thanks! Questions?

www.tm.uka.de/itm

Quality-of-Service Support for Mobile Users using...

Documents

Transcript of Quality-of-Service Support for Mobile Users using...