This document outlines an approach for seamless handover between DVB-H broadcast networks and Wi-Fi networks for mobile devices. It discusses the need to integrate heterogeneous networks to enhance coverage and addresses challenges like network and service discovery, selection algorithms, and a prototype implementation. The approach involves a network selection process using the Analytic Hierarchy Process to evaluate available networks and trigger handovers, with the goal of testing and validating an integrated system to enable continuous multimedia experiences across different access networks.

1. An approach to handover
between DVB-H and Wi-Fi
network...
Adrian Hornsby
Tampere University of Technology
Multimedia Group

2. Outline
• Short on DVB-H
• Motivations
• Issues to be solved
• Prototype for integrated broadcast system
• Implementation
• Universal Network and Service Discovery
• Network Selection Algorithm – AHP
• Execution timeline
• Trial Results
• In action
• The future ...

3. DVB-H
• Provides digital TV to mobile devices
• Combines traditional TV broadcast
standards with elements specific to
handheld devices
• mobility, smaller screens and antennas, indoor
coverage and battery consumption.
• Transmission of Data mainly as IP frames
• Bridging Digital world with IP world
• New video compression scheme (H.264)
with lower bitrate and for smaller screen
size
• approx. 390 Kbit/s per stream (MPEG2 34Mbit/s)

4. DVB-H
RF
signal
DVB-H modulator
MPEG2
MPEG2
MPEG2
8K
QPSK
UHF
TS
MU
DVB-H codec
amplifi
TPS
16
X 4K
IP er
QAM bits
streams MPE MPE Time-
IP 64
2K
-FEC Slicing QAM

5. Motivation (1)
The Future of Broadcasting
DVB,
Wifi, 3G GPS,
DMB,
S-DMB, S-DVB
WiMax MBMS Galileo
MediaFlo
w
In the park,
Before leaving his In the street, In the Tram, To find his way waiting for his
office, Bob checks walking to the he watchs the to the park friends, he
the latest Music tram, he lastest news where the pick receives an alert
News. and he continues report and the nick is, Bob uses that he can
downloads the listening to the lastest movie is GPS watch his
last Podcast from concert and trailers. navigation favourite band´s
his favorite radio. send some SMS Tonight he system. live concert. His
His favourite band to his friends to goes to the
mobile phone
´s last concert is arrange a pick- cinema.
saves the video
broadcasted live nick later on.
stream so he can
on the radio. He
watch it later,
listens to it.
after the pick-
nick.
HETEROGENEOUS NETWORK

6. Motivation (2)
Gap fillers, repeters ...
Cheap and widely deployed Wi-Fi
Technology
ENHANCING COVERAGE

7. Issues to be solved ...
• Factor to consider for Heterogeneous
Networking
– Network & Service Discovery
– Network Characteristics & Performances
– Terminal & Application Requirements
– User Profiles & Preferences
– Handover & Network Selection Algorithm
– User & Operators agreements

8. Prototype for Integrated Broadcast
System
Content
DVB transmitter Visualisation
DVB Serveur
IP Network
UNSD
Serve
Wifi 802.11b/
r
g base station
IP Network
Media
Router
Network, Application
Content and Availibility
Application
Content Service [FLUTE]
Provide Provider [FLUTE] Description
r

9. Implementation – Software Design
Network Infrastructure
Content Provider
Network &
Service
Streaming DVB-H playout
Discovery
Server Sytem
Wi-Fi DVB-H
Parameters
IEEE802.11b/g transmitter
Acquisition
User
Wi-Fi Frontend DVB-H Frontend Service Profile
Interactio
Selection Selection
n
IP stream filter
Network
Handover
Selection
Daemon
Media Player
Handover
Mobile Terminal Execution

10. Universal Network & Service Discovery
• Universal Network & Service Discovery
DVB-T/
H
3G
Universal MBMS
Network
&
Service
Wi-Fi
Discovery
WiMax

11. Universal Network & Service Discovery
Network
Service Service
Content Content
Original Proposed
ESG model ESG model

12. Network Selection
AHP – Analytic Hierarchy Process

13. AHP – Analytic Hierarchy Process

14. Execution - Timeline
Param. Network UNSD Service Handov Media
Fronten Evaluati Selectio Aquisiti Selectio er Playbac
ds Init. on n on n Managt. k

15. Trial Results
1
Building A
2
DVB-H
Transmitt
er
3
Building B
4

16. in action ...

17. The future ...
• Algorithm optimization
• Towards Cooperative Networking
• Valitated 3G integration
• Complete Integration of the different
components
• Investigate bandwidth optimization
• re-broadcating on demand

18. Thank You !!!
questions ??