International Telecommunication Union
Provision of
Multimedia Service Mobility
within the NGN
ITU-D/ITU-T Seminar on Standardization and
Development of Next Generation Networks for
the Arab Region (29 April – 2 May 2007)
Dr. Leo Lehmann
Rapporteur Q.29/16
Federal Office of Communication (OFCOM)
Switzerland
Content
ITU-D/
ITU-T
• Considered Scenario
• Multimedia Service
•
•
•
•
•
•
April/May 2007
Architecture
Mobility Management Terms
System Configuration
Service Mobility Handler
Service Handover Scenarios
Realization of Service Control
Summary
2
Considered Scenario
ITU-D/
ITU-T
NGN deployment enables (continuous) service
usage within different personal context involving
different types of access and devices
Office
Home
9
17
13
10
20
Z-Z-Z-Z-Z
Cable/DSL
mobile
Ethernet
Wi-Fi
22
Entertain
8
Presence
7
Leisure/Home
Ethernet
mobile
Cable/DSL
examples: video call, video conferencing via fix
and/or mobile access
April/May 2007
3
Multimedia Service Architecture
ITU-D/
ITU-T
Level
Service
Factors
Service:
Multimedia
Conversation
Communication
Conversing
Task:
Media
Component:
Audio
Sending
Video
Text
Overall Delay
Differential Delay/
Lip Synchronism
Receiving
Graphics
Frame Rate
Frame Resolution
Bandwidth
Dynamic
Distortion
Corrupted Char.
Optional
Mandatory
April/May 2007
ITU-T F700 series
4
Mobility Management Terms
General
Mobility
ITU-D/
ITU-T
Terminal
Mobility
Service
Continuity
Seamless
HO
Movement
Mobility
Access
Technology
Change
User
Mobility
Network
Mobility
Service
Mobility
Service
Discontinuity
Non Seamless
HO
Source: ITU-T
April/May 2007
5
Mobility Management Terms
(cont.)
ITU-D/
ITU-T
Service mobility (ITU-T Y.2801)
This is the mobility, applied for a specific service,
i.e. the ability of a moving object to use the
particular (subscribed) service irrespective of the
location of the user and the terminal that is used for
that purpose.
Note:
Service mobility also implies the possibility to
suspend any running service on one device and to
pick it up on another one
Service Mobility
requires
User Mobility
April/May 2007
Terminal Mobility
6
Mobility Management Terms
(cont.)
ITU-D/
ITU-T
Personal mobility (ITU-T Y.2801)
This is the mobility for those scenarios where the
user changes the terminal used for network access
at different locations. The ability of a user to access
telecommunication services at any terminal on the
basis of a personal identifier, and the capability of
the network to provide those services delineated in
the user's service profile.
Terminal mobility (ITU-T Y.2801)
This is the mobility for those scenarios where the
same terminal equipment is moving or is used at
different locations. The ability of a terminal to
access telecommunication services from different
locations and while in motion, and the capability of
the network to identify and locate that terminal.
April/May 2007
7
System Configuration
AS
AS
ITU-D/
ITU-T
Core Network
IMS
Home
LM
SMH
SMH
HM
Local
LM
HM
Local
LM
Access Network
AP
Access Network
AP
AP
AP
UE
ITU-T Draft Rec. MMF (Generic Framework of
Mobility Management for Next Generation Networks)
UE
Location Manager (LM): Used to provide the location registration and
location update (tracking)
Handover Manager (HM): Used to support seamless handover (change of
IP address possible)
April/May 2007
Service Mobility Handler (SMH): Control of media components, QoS
adaptation for each media component, Control of switching of media
streams (handover) between AP’s in cooperation with HM (separated or colocated to HM)
8
Service Mobility Handler
initialisation during
service initiation
User
Profile
ITU-D/
ITU-T
Service Profile
Device
Profile
Access
Profile
SMH
Possible Service
Performance
Correspondent
Result
:=Adaptation/ Adjustment
Possible Service Performance
Determination of the available service variants under the
given constraints of user preferences and contractual
agreements, current device and network access restrictions
(e.g. available performance, codec’s, bandwidth etc.) as well
as the communication partner’s service performance.
April/May 2007
9
Service Mobility Handler (cont.)
Example: Adaptation/ adjustment audio/video codec’s
ITU-D/
ITU-T
Service
Profile
Audio
G.728
Video
MPEG
User
Profile
Audio
AMR
Video
H.261
Audio
µLaw PCM
Device
Profile
User Profile: Translation into technical expressions:
• minimum videophone quality => SQCIF – QCIF
• basic videoconferencing quality =>CIF
April/May 2007
10
Handover Scenarios
Correspondent User
AS
AS
ITU-D/
ITU-T
Core Network
IMS
AP1-1
(video)
SMH
Access Network
Mobile
AP1-2
(voice only)
SMH
Access Network
Fix
AP2-1 (video)
AP2-2
WLAN/BWA
xDSL
UE 1
(mobile) AP Change
1.
2.
3.
4.
5.
6.
April/May 2007
UE 1
(mobile)
AP & Device
Change
UE 2
(fix)
Setup of a video call from UE1 via AP1-1
Movement of UE1 requires handover to AP1-2 (only voice streams)
If the user profile of one of the communication partners mandatory
requires video the call has to be terminated. Otherwise the video stream
component of the conversation is terminated
Handover to AP1-2 is executed
The user forces a handover from mobile device UE1 to fix device UE2
UE2 connected to AP2-1 enables video stream functionality, thus video call
can be resumed between communication partners
11
Objectives with regard to NGN
ITU-D/
ITU-T
• Recognition that service mobility
considerations are for the future, not
for legacy services
• application layer controlled service
mobility could be also feasible
especially in case of best effort
scenarios
April/May 2007
12
Service Control
ITU-D/
ITU-T
Home centric service control for roamers: services are
only accessible via the user’s home network
Visited
Network
user
Service
Request
Results
Home
Network
Proxy
Service
Request
Service
Controller
Service
Execution
Results
• Visited network acts as
•
•
April/May 2007
proxy
basic capabilities
required by visited
network (bandwidth)
supported by IMS and to
be integrated into the
NGN (S-CSCF of home
network)
13
Service Control (cont.)
ITU-D/
ITU-T
Visited centric service control for roamers: service
control is handled by the visited network (break out
service)
Visited
Network
user
Service
Request
Home
Network
Local Service
Controller
Mobility
Controller
Inquiry
Permission
Results
Service
Execution
Logic Transfer (option)
• lower dependency from
•
•
April/May 2007
home service provider
logic transfer requires
hardware compatibility
appropriate roaming
agreements and SLA’s
14
Service Control (cont.)
ITU-D/
ITU-T
April/May 2007
Comparison Home/ Visited Centric Control
Home Centric
Visited Centric
NGN Support
+
(availability)
Complexity
O
-
Delays
-
+
RFID Suitability
O
+
Accounting & billing
+
o
(prepaid)
Profile Handling
o
o
15
Summary
• ITU-T Standardization
¾ Draft TP.MMSM (Service Mobility for New Multimedia
ITU-D/
ITU-T
•
•
April/May 2007
Service Architecture)
¾ Draft Rec. MMF (Framework of Mobility Management
for NGN)
¾ Draft Rec. LMF (Framework of Location Management
for NGN)
¾ Draft Rec. HMF (Framework of Handover
Management for NGN)
¾ Y.2801 (Mobility Management Requirements for
NGN)
4 closely related co-operating Questions (Q.6/13,
Q.2/19,Q5/19, Q.29/16)
Interest are welcome to
contribute to standardization
of service mobility
16
ITU-D/
ITU-T
Thank you !
April/May 2007
17