Transcript SIP Mobility - Columbia University

Implementing a Testbed for Mobile Multimedia
Authors: A.Dutta, J.C Chen, S. Das, M. Elaoud, D. Famolari,
S. Madhani, A McAuley, M. Tauil
Telcordia Technologies
S. Baba, T.Maeda, N. Nakajima, Y. Ohba
Toshiba America Research Inc.
Henning Schulzrinne
Columbia University
Presenter: Ashutosh Dutta
ITSUMO Project
Internet Technology Supporting Universal Mobile Operations
( Joint Research of Toshiba and Telcordia Technologies)
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 2
Outline
 Motivation
 Architecture Components
 Protocol Galaxy
 Prototype/Signal Flows
 Demo (Internal & External)
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 3
Issue
–The New York Times (Aug. 23, 1999, “Multimedia
Transmissions Drive Net Toward Gridlock”)
–Multimedia streaming is going to be a killer application
for the Internet.
–Multimedia traffic is RTP/UDP based, applications
include
 IP telephony
 Broadcasting multimedia content
 Multi-party conferences, collaborations
 Multi-player games
–We need a mobility management scheme for multimedia traffic in the wireless Internet
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 4
Motivation
 To realize Wireless Internet Telephony and Mobile
multimedia in an internal and external Test-bed to
help deployment
 Components
– Signaling
– Configuration
– Binding - Session Continuity
– Security - BURP/AAA
– QoS
– Media Delivery - Wireless Multicast
– IP-PSTN
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 5
MGCP
Signaling
SAP
SIP
SDP
(H.261. MPEG)
RSVP
RTSP
LDAP
Network
TCP
CIP
MIP
PPP
DNS
RTCP
RTP
UDP
MIPv6
MIP variant IPv4, IPv6, IP Multicast ICMP
AAL3/4
AAL5
IGMP
PPP
Kernel
H.323
Quality of Service
Media Transport
media encaps
Application Daemon
Internet Multimedia Protocol Stack
Physical
CDMA
SONET
ATM
802.11
Ethernet
Telcordia Technologies, TARI and Toshiba Internal Use Only
V.34
Globecom 2001 – 6
Service Profile for all IP wireless network user
Services
Requirements
Delay
Loss/error
Bit rate (outdoor)
Bit rate (indoor)
Example
applications
Multimedia
Voice
Data
Stringent
Tolerant - Stringent
Pedestrian  384 kb/s
Vehicular  144 kb/s
 2 Mb/s
Video streaming, video
conferencing
Stringent
Tolerant
 64 kb/s
Tolerant
Stringent
Pedestrian  384 kb/s
Vehicular  144 kb/s
 2Mb/s
File Transfer (e.g., ftp)
to mobile
 64kb/s
Mobile telephony
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 7
ITSUMO’s Principles
 End-to-end wireless/wireline IP platform
Reduce wireless infrastructure cost
 Global roaming
Enable seamless communication anywhere
 Wireless “technology-independence”
Common middleware for any wireless interface
 Support of real-time and non-real time multimedia services
using IP
Simplify implementation & reduce cost (e.g.VoIP)
 Smooth/seamless interworking with PSTN and today’s mobile
telephony
Enable communication with existing network
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 8
The ITSUMO All-IP Network Architecture
Control messages
(i.e..., signaling)
IDCA
Visited Network
Inter-Domain
Control Agent
DCA
DCA
Domain
Control Agent
MS
Home Network
Domain
Control Agent
ERC
BS
ERC
Regional IP
network
Internet
BS
Regional IP
network
IP
BS
Radio Access Network
(RAN)
Wireline IP backbone network
BS
Radio Access Network
(RAN)
MS: Mobile Station
BS: Base Station
ERC: Edge Router & Controller
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 9
Wireless Internet Roaming
SIP: Session Initiation Protocol
DCA: Domain Control Agent
ERC: Edge Router & Controller
MAAAQ: Mobility, AAA, Quality of Service
Visiting Registrar
VR
Visiting Network
Home Network
SLA/SA
Home Registrar
AAAQ
MAAAQ
RTP
Translator
HR
SIP Server
SIP Server
SIP
SIP
DRCP
Corresponding Host
IPch
DRCP
ERC 1
ERC 3
Internet
BS
BSC 3
BSC 1
ERC 2
BS
BSC 2
A
128.59.11.6
207.3.232.10
BS
BS
207.3.240.10
D
128.59.10.6
207.3.232.10
B
BS
INVITE
C
• SIP UA in mobiles and hosts.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 10
2G + 3G Wireless Access, Packet Switched Backbone
VLR
HLR
SS7
TCAP, ISUP
MAAAQ
A Interface
Call Agent SIP Server
MGCP
MGCP
2G
Access
WG2
SIP
2G
Access
WG2
IP Network
SIP
3G
Access
Telcordia Technologies, TARI and Toshiba Internal Use Only
3G
Access
Globecom 2001 – 11
Wireless Internet Telephony Test-bed Protocols
Functionality
Signaling
Protocols
SIP/MGCP
Configuration
DRCP - aka
Fast
(wireless)DHCP
BURP
(Basic User
Registration
Protocol)
Diameter
Local
Authentication
Inter-Domain
(AAA)
Location
Management
SIP Registration
Dynamic DNS for
non SIP- sessions
QoS
DSNP
Multicast
PIM/DVMRP
Application layer
(RTP/RTCP)
Binding
SIP based mobility
management for
real-time
application, MIP
for TCP based
Details/Remarks/usage
SIP was used for IP end-points.
MGCP was used with Call Agent
Faster registration protocol for
wireless roaming users - a variant of
fast DHCP
User registration protocol similar to
PPP is for dialup environment for
roaming within a domain.
SIP-AAA interaction before the
registration is successful
Inter AAA interaction during domain
handoff
Re-registration upon subnet change
AAA is involved only after it changes
a domain.
Dynamically allocates QoS during the
subnet handoff
Localized Multicast application
QoS experiments for Multicast
application
Intra-domain mobility with fasthandoff
Supports audio/video/white board as
part of mobility application.
(indoor/outdoor)
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 12
ITSUMO Technology Suites (1/2)
 DRCP (Dynamic Rapid Configuration Protocol) *1
– Light weight (i.e., short message length, less number of exchanging
messages) network-node configuration protocol suitable for the wireless
environment
 SIP Mobility *1
– Mobility Management Framework that is realized at the message level of SIP
(IETF signaling protocol for VoIP) and fits well with the VoIP and Multimedia
application
 QoS Architecture
*1
– Architecture based on Diffserv (Differentiated Service), that supports wireless
user’s free roaming.
– Realizing dynamic SLS negotiation between user and network by the original
QoS signaling protocol (DSNP).
DSNP: Dynamic SLS Negotiation Protocol
SLS: Service Level Specification
*1: Refer to Appendixes for more information
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 13
ITSUMO Technology Suites (2/2)
 Wireless Multicast
– Localized Advertisement using RTCP feedback
– Scope-based multicast
 AAA Architecture
*1
– Based on Diameter (Network-network AAA protocol developing in IETF)
framework.
– Supporting wireless user’s handoff by the local authentication using temporal
“session key”.
– Increasing flexibility by designing original protocol, BURP, that is used
between user and the network independent of Diameter.
 IP-PSTN integration
– SIP and MGCP Protocol Suite
– Call-Agent
 IP based Wireless Access Point
– IP centric wireless access point to support a hot spot.
– Realization of the soft-handoff in the radio access network consisting of the IP
network.
AAA: Authentication, Authorization and Accounting
BURP: Basic User Registration Protocol
*1: Refer to Appendix for more information
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 14
Configuration - DRCP Principles
 Shrink message size
 Minimize messages in transactions
 Minimize use of Broadcast
– In wireless technologies, e.g., cdma2000, broadcast
bandwidth is a scarce resource.
One Possible Solution:
– Server Advertisement
 It gives deterministic use of broadcast.
 Client can use link layer unicast.
 Tradeoff with latency of configuration.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 15
Message Size (in bytes)
DRCP vs DHCP Messages
250
200
150
100
50
0
DHCP



DHCP - 236 bytes
DRCP - 14 bytes
94 % improvement
Telcordia Technologies, TARI and Toshiba Internal Use Only
DRCP
Globecom 2001 – 16
Signaling/Binding - SIP Mobility - Handoff
Corresponding
Host at
IP0
SIP signaling
Mobile Host at
IP1
RTP
Invite user@domain
SIP UA
IP2
RAT/VIC
Contact user@IP2
Mobile Host
-> IP2
SIP signaling
RTP
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 17
SIP Mobility - Handoff 3. Send Data to
New Address
2. re-INVITE
BS
BS
Correspondent
Host (CH)
By sending SIP re-INVITE message
from new location, CH starts sending its
voice packets to the new location and
Communication continues seamlessly
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 18
ITSUMO QoS Architecture
Domain 1
QGS
DHCP
server
Domain 2
Global IP Network
QGS
AAA
server
DHCP
server
QLN
2
QLN
QLN
AAA
server
QLN
QLN
QLN
1
RAN
RAN
RAN
RAN
RAN
RAN
QGS: QoS Global Server
QLN: QoS Local Node
MS: Mobile Station
MS
RAN: Radio Access Network
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 19
ITSUMO AAA Architecture
Domain2 (Foreign network)
Domain1 (Home network)
DIAMETER Server
DIAMETER Server
(AAA Foreign)
(AAA Home)
Pre-shared key
for alice@domain1
Temporary key for alice@domain1
DIAMETER Client
BURP Server
DIAMETER Client
BURP Server
w/Firewall
w/Firewall
Correspondent Host
RAN2
RAN1
RAN in
Home Net
Mobile Station
BURP Client
NAI=alice@domain1
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 20
Security
–

Providing IP-based security mechanism for access networks
especially for WLAN
Methods
–
User authentication (with roaming support)
–
UNAP (User-Network AAA Protocol)
•
•
•
•
Runs between user device and Authentication Agent as a front-end AAA
protocol such as Diameter/RADIUS
Supports periodical re-authentication for logoff detection and connection
hijacking protection
•
Re-authentication is performed locally between user device and AA
Supports distribution of site-specific security information such as IKE
credentials (see below)
Per-packet message encryption and integrity check (with roaming
support)
–
IPsec tunnel between client device and IPsec gateway
•
•
Less overhead than PPP-based VPN solution
No pre-configration is needed for IPsec (IKE) parameters in the client device
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 21
Session Establishment
Host
password
UNAPserver with IPsec gateway
AAA server
IKE-credential
IKE-credential
session key
session key
UNAP Hello[username=''[email protected]'']
password
for user xxx
UNAP Hello_ACK[challenge,username]
UNAP Open[challenge, response,username]
UNAP Open_ACK
[ E[session-key], IKE-credential ]
If check is OK,
Diameter Request
create a session-ke
[challenge, response, username]
and encrypt it
using the password
Diameter Answer
[username, session-key, E[session-key]]
Access Control Status
Internet/Intranet
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 23
Next Step: IPsec Tunnel Creation
Host
IKE-credential
UNAP server with IPsec gateway
AAA server
IKE message exchange
IKE-credential
:
:
Access Control Status
IPsec tunne1
Telcordia Technologies, TARI and Toshiba Internal Use Only
Internet/Intranet
Globecom 2001 – 24
A Global Streaming Network
Inter ACN
Links
IAL
Internet
in-the
Sky
Global
Station
Broadband LEOs
IP I/F
Up link
Traditional
Radio/TV
Up link
Down Link
with
spot-beam
IP I/F
Individual
Broadcaster
Terrestrial
INTERNET
Wireless
IP I/F
Local Ad
Server
Local
Server A
Local Ad
Server
Local Subnet
Local
Server B
Local Subnet
Telcordia Technologies, TARI and Toshiba Internal Use Only
Local
Server C
Local Subnet
Globecom 2001 – 25
Localized Multicast with Multiple Servers
IETF protocols
SAP- Session Announcement Protocol
SDP - Session Description Protocol
RTP/RTCP - Real-Time Transport Protocol
RTSP – RealTime Streaming Protocol
Sources
p1
S1
S2
p2
M-Proxy
Backbone
S1
m1
S0
Local
Server
m1
m2
Local
Server
RTSP
Local
Program
Ad server
m2
RTSP
Local
Program
Ad server
(a1,a2)
(a3)
BS1
BS0
(P1,a1)
(P2,a2)
BS2
P2,a3
P2,a2
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 26
Call Agent/RGW- IP- PSTN integration
Solaris/NT
CA/SIP server
CA/SIP server
Solaris/NT
MCAP/SIP-BCPT
Backbone Network
Access
Gateway
Access
Gateway
FX board
FX board
Residential
Non-IP Phone
HA/DRCP
server
Residential
Gateway
Gateway
DRCP
server
Non-IP Phone
Base
Station
IP Phone
Base
Station
Non-IP Phone
Mini
RGW
Mini
RGW
SIP
UA
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 27
SIP User to analog phone (SIP-MGCP)
PC A
Call
Connection
Agent/SIP server
SIP Agent A
CGW
Dials
Ringing
Tone
INVITE
CGW
PC B
Call Processing
CRCX+RQNT
Resp. 180
Ringing
ACK
Notify
ACK
Offhook
RQNT
Resp. 200 OK
ACK
ACK
Call Established
Notify
On hook
ACK
No suspension
message
RQNT
ACK
Hangup detected
BYE
DLCX+RQNT
Performance Data
Call Terminates
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 28
ITSUMO Testbed Architecture
Domain 1
Domain 2
Backbone
Border Router
Border Router
3600
3600
SIP
Server/Call
Agent
Multicast
Proxy
R1
AAA
Server
AAA
Server
BURP
ERC1
HA/DRCP
Server
QOS
VLAN Switch
Micro
DRCP
Server
BURP
R2
SIP
Server/Call
Agent
SIP
Server
DRCP
Server
ERC2
ERC4
QOS
QOS
Macro
DRCP
Server
BURP
ERC3
VLAN Switch
R3
VLAN Switch
Domain
Telcordia Technologies, TARI and Toshiba Internal Use Only
QOS
External
Omni
Antenna
VLAN Switch
External Demo
Globecom 2001 – 29
BEA Server
207.3.232.64/26
backbone
207.3.232.82
DCA1
10.1.5.3
207.3.232.112
toshi16
10.2.1.121
10.2.1.1
netmeeting
10.1.5.152
10.2.1.122
Indoor
Outdoor
AP
Outdoor
10.2.2.152
Outdoor
AP
10.2.2.1
onboard
router
10.2.1.201
EC
10.2.2.151
netmeeting
GPS client
Outdoor
AP
network name
= “ITSUMO outdoor”
GPS Receiver
onboard
network
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 30
Unified Mobility Solution
Micro
Mobility
MS
Macro
Domain
Mobility
Mobility
Detect a change in
the point of
attachment (from
Layer-3 perspective)
Detect a change in
the point of
attachment (from
Layer-3 perspective)
DRCP
IP Level
Configuration
IP Level
Configuration
BURP
Do Local AAA
Do Global AAA
Detect a change in
the point of
attachment (from
Layer-2 perspective)
SLS negotiation
DSNP
SIP
Mobility
Re-invite CH
and send
Register Msg
Telcordia Technologies, TARI and Toshiba Internal Use Only
Re-invite CH
and send
Register Msg
Globecom 2001 – 31
tari.toshiba.com
Public
SIP
Server
Research.telcordia.com
Broker
AAA
Diameter
Client
Home AAA
Diameter
Server
Diameter
Client
Diameter
Client
Home SIP
Server
1
BURP
Server
2
3
2
1
4
DRCP BURP SIP
Client Client UA
Home SIP
Server
Intra-domain subnet handoff
Diameter Client
D
R
C
P
BURP
Server
Server
Diameter Client
D
R
C
P
Server
visited AAA
Diameter
Server
3 4
Inter-domain subnet handoff
MH moves
MH
DRCP BURPSIP
Client ClientUA
Telcordia Technologies, TARI and Toshiba Internal Use Only
MH
D
R
C
P
Server
1
Diameter Client
BURP Server
2
DRCP BURP SIP
Client Client UA
Globecom 2001 – 32
MH
Demonstration using the outdoor extension
ITSUMO Testbed (Outdoor Portion）
•Performance evaluation under the
environment of Outdoor and/or fast
moving.
•802.11b (WaveLAN)
•Area in a few thousand feet away
from the building is covered by
several Base Stations (BSs).
•Each BS forms a sub-area. The type
of inter-sub-area handoff is assigned
freely.
•It is available to experiment with a
car moving at the speed less than
around 45MPH.
•Service experiment:
•IP based Terminal Authentication
and/or Handoff
•IP based Phone, Video and File
share services.
IntraSubnet
(Micro)
InterSubnet (Macro)
InterDomain
IP based Real-time handoff
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 34
Demonstration using the outdoor extension
SIP Indoor Mobility Demonstration
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 36
Thank You !

Q and A
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 37
Backup Slides
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 38
ITSUMO Outdoor Experiment
Base Station
-Emulating cdma2000 by using WaveLAN
-Mobility test by using the eight radio cells
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 39
ITSUMO Outdoor Experiment
Driving route
300 m
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 40
Protocol Integration Demonstration
 DRCP (terminal config.)
 SIP Mobility
 Unified Mobility
Management
– Handoff
– Location Update
 AAA for mobile users
– BURP
 QoS for mobile
– DSNP
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 41
1. Unified Mobility Management
ITSUMO approach
 Unified Mobility
– Each function (i.e. terminal configuration, user registration
and location update) must be adapted to the state of handoff,
i.e., Micro-, Macro- and Domain Handoff.
 Security based on a single framework
– Single AAA framework supports both user registration and
signaling message authentication (e.g., SIP message
authentication using AAA).
 QoS with Mobile
– Use Diffserv as a foundation to support a mobile user.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 42
SIP-AAA Interaction
MH
Subnet
changes
Home
SIP server/Diameter
AAA Server
Client
SIP Register
Time
SIP Server/Challenge (401)
SIP
Registration
SIP Register with/Challenge-Response
Diameter Request
SIP Register OK
Diameter Reply
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 43
Localized Multicast Application with mobility
R
Multicast
Agent
Stream
Server
R1
R2
Multicast
proxy
Mapping:
M1 ---> m1 (Cell 1)
M1 ----> n1 (Cell 2)
M1
Ia
Ib
CGMP/IGMP
snooping
Mx
M1
Local
content
S2
Local
content
lm1
m1
ia
m1
lm1
ib
m1 Lmx
ib
Case1
m1 = n1
Case 2
m1=! n1
Mx
S3
Same subnet
Id
Sharing multicast
address
M1
Multicast Switch
S1
Ic
Msx
S5
S4
n1
Lmx
ic
Telcordia Technologies, TARI and Toshiba Internal Use Only
id
Globecom 2001 – 44
ITSUMO Value Proposition
 ITSUMO offers end users seamless IP connectivity
across various wireless/wireline networks.
 ITSUMO enables end users to select the best access
network in terms of speed, cost and services.
 ITSUMO enables network operators to manage a
single network for various services and to reduce the
cost for maintenance and modifications.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 45
What is All IP Wireless and What for?
(Research Background)
Data becomes dominant even in “wireless” world
Data is most efficiently carried by “IP(Internet Protocol)”
However, present IP technology cannot carry realtime
voice/video in wireless world
This causes high infrastructure cost and difficulty in
sharing wireline Internet application in wireless world
We will first solve this problem by developing
- Wireless VoIP, IP signaling, Security, Unified addressing
- Evolution scenario from current wireless to IP wireless
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 46
DRCP Message Flow
Server
Client
ADVERTISEMENT
REQUEST
Client
Server
REQUEST/RELEASE
REPLY
ACK
Time axis
a) Client moves to new Subnet
b) Extending the lease
 Send DISCOVER when new server ADVERTISEMENT
 OFFER tells if need new IP address, re-register, ...
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 47
On going work and Future Direction
 Multiple Radio Support
– Introducing Bluetooth
– Shadow MAC addressing
 Network management
– Monitoring Network in real time
– Automatic entity configuration ( i.e. Plug and Play)
 IPv6
– Evolution of ITSUMO solution to IPv6
 VoIP
– SIP-MGCP-H.323 inter-work with Call Agent
– Supporting “Services”, e.g. conference calls, voice mail,
 Outdoor Extension / Service Application
– Unified Mobility at the Renovated Outdoor Extension
– IP paging (DMHA: Dormant Mode Host Alerting)
– Location base service
– IP Multicast
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 48
SIP Mobility
BS
BS
Correspondent
Host (CH)
Mobile Host (MH)
1. Move
Established voice
communication
with SIP
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 49
ITSUMO Major Achievement
 Established basic wireless IP network architecture
– IP signaling / IP based base station / Evolution scenario
 Proposed original wireless IP protocol suites
– 4 original protocols (DRCP,HMMP,DSNP,BURP) created
– 21 contributions submitted to IETF/ MWIF/ 3GPP2
 Created patents
– 18 patents ongoing application (out of 38 patent ideas)
 Developed testbed
– Realistic demos for wireless IP network (micro/macro/domain
handoff)
 Exhibited at major trade shows
– PCS 99, CTIA 2000, COMDEX Fall 2000
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 50
Testbed Network Configuration
Correspondent
Host (CH)
Home
SIP Server
(Registrar)
DCA2
(AAAf)
DCA1
(AAAh)
Click to
edit
Master
title
style
ERC1
(DRCP,QLN,
BURP,FW)
10.1.1.x
10.1.4.x
10.1.3.x
MS
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 51
Basic idea of BURP
 BURP uses EAP(Extensible Authentication Protocol) for flexibility
of the authentication mean.
– Complete authentication of MS with Home AAA (Diameter)
Server by using Pre-shared Key for Inter-domain handoff (i.e.,
Global AAA).
– Local authentication by using the Session Key which is
temporally generated by the Home AAA server and shared
between MS and a server in the foreign network for Intradomain handoff (i.e., Local AAA).
– Periodical authentication (challenge-response) of MS in order
to detect its movement or power-off.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 52
ITSUMO QoS Framework
 Use diffserv as the foundation in the backbone
 Major components
– QGS (QoS Global Server)
 Retain global information of the whole domain
 Make QoS related decision and instruct QLNs what to do
– QLN (QoS Local Node)
 Retain local information of the resource available in the
local domain
 Ingress node of the diffserv domain
 Architecture characteristics:
– A central authority per domain with global information, and
several local ingress nodes with local information
– QoS signaling and transport are separated
 Central server deals with the QoS signaling (DSNP)
 Local nodes handle the actual transport traffic
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 53
SIP Mobility
BS
BS
Correspondent
Host (CH)
Mobile Host (MH)
1. Move
Established voice
communication
with SIP
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 54
SIP Mobility - Handoff 3. Send Data to
New Address
2. re-INVITE
BS
BS
Correspondent
Host (CH)
By sending SIP re-INVITE message
from new location, CH starts sending its
voice packets to the new location and
Communication continues seamlessly
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 55
Merits of SIP Mobility
Direct and Optimized Communication
 One single and simple protocol for signaling and
mobility management.
 End-to-end mobility management support from the
terminal  no state in the network.
 No need for interception and forwarding agents in
the network.
 No triangular routing of information, i.e., lower delay.
- Provide mobility with route optimization in the absence of
Mobile IP (no home and foreign agents).
 Support real-time and non-real-time applications.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 56
Security for the Mobile User
 BURP: offers user registration/authentication at the
application level with a AAA (Diameter) framework.
BURP opens the firewall for authorized users.
 BURP: supports local authentication for quick handoff
as well as strong security, even in a visiting network.
 SIP: “Register” message is authenticated by using
AAA framework. Thus, a mobile’s location is updated
more securely.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 57
2. Localized Multicast Service
 Multicast streaming traffic (audio/video) that is
managed by the local server.
 The local server can insert local program,
information, advertisement into the global streaming
program.
 Timing for the local control is based on the
information carried by RTCP from the streaming
server.
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 60
Architecture of Localized Multicast for
Advertisement
IETF protocols
SAP- Session Announcement Protocol
SDP - Session Description Protocol
RTP/RTCP - Real-Time Transport Protocol
RTSP – RealTime Streaming Protocol
(Audio/Video)
p1 Station 1 p2 Station 2
RTP/RTCP
M2
M1
SAP
Channel
monitor
Channel
database
P1,a1
m1
Backbone
Scope 1
Local
Server
Local
SAP
Scope 2
m2
P2,a1
Local
Program
lm
IRC
Wireless Clients
Ad server
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 61
3. Outdoor extension
•Performance evaluation under the
environment of Outdoor and/or fast
moving.
•802.11b (WaveLAN)
•It is available to experiment with a
car moving at the speed less than
around 45MPH.
•Service experiment:
•IP based Terminal Authentication
and/or Handoff
•IP based Phone, Video and File
share services.
IntraSubnet
(Micro)
InterSubnet (Macro)
InterDomain
IP based Real-time handoff
Telcordia Technologies, TARI and Toshiba Internal Use Only
Globecom 2001 – 62