Transcript IEEE 802.21 WG Presentation Template

IEEE 802.21 MEDIA INDEPENDENT HANDOVER
DCN: 21-08-0089-00-0000
Title: DVB-H Integration
Date Submitted: March, 2008
Presented at IEEE 802.21 session #25 in Orlando
Authors or Source(s):
Burak Simsek (Fraunhofer Institute)
Juan Carlos Zuniga (InterDigital)
Peter Pogrzeba (Deutsche Telekom)
Teodor Buburuzan (Technical University of Braunschweig)
Patrick Stupar (NEC)
Michelle Wetterwald (Eurecom)
Michael Grigat (Deutsche Telekom)
Jens Mödeker (Fraunhofer Institute)
Andreas Sieber (IRT)
Abstract: This presentation summarizes DVB-H characteristics and describes
the service discovery procedure of DVB-H.
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Summary
• DVB … A broadcast dedicated technology
• DVB-H is based on DVB-T standard but designed for small,
portable devices like Mobile Phones.
•
•
Optimized reception in mobile environments through new modulation
and error correction mechanisms (better signal quality)
By the use of time-slices it is perfect suited for small, battery-powered
devices
• Advantages
•
•
•
•
•
Unlimited number of receivers
Up to 40 km coverage per transmitter
Around 20 AV streams with 300kbps
Hence an efficient technology for popular multimedia services
More than 80 manufacturers
•
Intel, Nokia, Motorola, Samsung, Alcatel-Lucent,…
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Summary
• DVB supports IP since 2006 with IP Datacast
• DVB IP Datacast is a Service Provisioning Framework designed to provide IP
based services over DVB-H
•
Purchase and billing, service description, schedule and acquisition…
• Developed by the DVB CBMS (Convergence of Broadcast and Mobile
Services ) Working Group
•
•
•
•
This is the group IEEE 802.21 should cooperate with
Chairman: Georges Martinez (Motorola)
Most active partners: Nokia, Motorola, Philips, Samsung, France Telecom,
Siemens, Thomson, Expway, NDS…
There is a liasion to OMA BCAST
• Prof. Reimers:
“In my capacity as Chairman of the Technical Module of the International DVB Project, I strongly support the
inclusion of DVB-H in IEEE 802.21… It is clear that numerous companies are working on the integration of 3G
networks and this additional DVB-H broadcast downstream into "hybrid" network structures. The IEEE would
therefore be well advised to incorporate certain broadcast technologies in IEEE 802.21.”
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SUMMARY
Interim target scenario
Berlin
 Should be realized until
2011
 To cover 36 regions of
Germany and some smaller
areas
 About 45% population
coverage (36 Mio people)
Frankfurt
Munich
 A nation wide DVB-H
coverage is not planned
(Source Deutshce Telekom)
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SUMMARY
Require bidirectional channels
Mobile TV/Radio
 TV/radio
transmission
 FTA (free-to-air) or
encrypted
transmission
 H.264 streaming
Mobile TV with synchronized,
auxialiary data stream
 TV with auxiliary
data i.e. text or
data elements for
interaction
 No synchronization
of data elements
with A/V stream
 Time shifting
Interactive
mobile TV
File Download
 Rich media services
with advanced
interactivity
 A/V stream includes
additional data
streams
 Synchronization of
data streams with
A/V stream
User triggered
download of any kind
of content via
broadcast
 Ring Tones
 Music
 Maps
 A/V clips
 Games…
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Src: Télédiffusion de France (media&broadcast)
Content
Provider
Content
Aggregator
Mobile Broadcast Service Provider
TV Guide
Content Creation
File Content
Service
Meta Data
Content Creation
OMA BCAST
Mobile Terminal
IEEE
Network
Shop
Front End
Service Application
Management
DVB-H
Broadcast
Network
Live Content
Mobile Network Operator
DRM
Broadcast
Platform
Playout
Management
IPTV
Platform
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IPDatacast
Management
Broadcast Operator
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DVB-H Interest and Timeline
• Initial presentation to 802.21 WG made in November’s 07
meeting
•
•
•
•
Hybrid Broadcast/Mobile Networks composed of 3GPP and IEEE
technologies have significant financial advantages for all mobile
network operators
Initial mobile TV services using hybrid networks in different
countries have shown that customer acceptance is very high
European Commission declared DVB-H as the official standard of
Europe for mobile broadcasting
IEEE 802.21 is well in the place of enabling optimized cooperation
of hybrid networks
• Second presentation to 802.21 WG made in January’s 08
meeting
•
•
•
Use cases for 802.21 with DVB-H
DVB-H as all the other wireless technologies has Cos and Pros
necessitating handovers
There are only minimal changes needed to integrate
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DVB-H Interest and Timeline
• Straw poll in January 08 meeting showed there is relevant work to be done
in 802.21 for DVB Handovers
• 21 yes, 1 no, 1 abstain
• Motion accepted in January 08 to appoint Burak Simsek as the liaison
between 802.21 WG and the DVB Forum
• Teleconference held in with Prof. Reimers (DVB Chair Technical Module )
in February 08
• DVB Forum has assigned agenda time in June’s meeting for 802.21
presentation
 Technical Module (Chair Prof. Reimers … TU Braunschweig)
 CBMS (Chair Georges Martinez … Motorola)
 Mobility Task Group (Chair Gunther May … TU Braunschweig)
 Juan Carlos Zuniga will be making the presentation
 Liaison follows the presentation
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Future Work
• Create a Study Group
• Purpose
• To determine what work, if any, is necessary to enable
DVB-H Handovers to other wireless technologies
• Study group will consider
• Handset, network and service provider input
• Specific requirements in 802.21 to support DVB-H
handovers
• Existing work in this area
• Goals and Timeframe
•
•
Keep agenda time to a minimum and hold most discussions over
email and teleconferences
2 plenary cycles
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Straw Poll
• Would you like to see the creation of an IEEE 802.21 Study
Group for supporting broadcast handovers?
Yes 27
No 0
Abstain 8
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Thanks For Your Attention
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Back up slides
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Service Discovery in DVB-H
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Handover from X to DVB-H
• Popular Multimedia Services, hence
unidirectional
• Handover is triggered by some means from
X to DVB-H
•
What kind of information do we need in order
to switch to the same IP Stream?
• Without any prior information it is possible
to have this information but takes too
long…
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DVB-H Transport Structure
DVB-H Network
Providers
Broadcasters
TV Channels
Here are the IP
streams
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Scanning / Tuning
Finding the network
• Worst case: Whole Frequency
scanning (e.g. 470MHz – 862MHz)
•
NIT_actual – NIT_other
•
•
•
•
Reduces the frequencies to be scanned to a
specific list
If does not exits, either found
frequencies are used or whole scan is
carried on
For each found network, accomplish
tuning
Search within transport stream if the
service exits or not…
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How to Locate Service
Identify IP Streams
• We should know what we are looking for in DVB-H
language…
•
•
IP Platform: A set of IP/MAC streams and/or receiver devices
managed by an organization
The IP/MAC platform concept allows for the coexistence of several
non-harmonized IP/MAC address spaces on the same DVB
network.
• Two IP streams carry the same IP datagram stream if all
the following conditions are true:
•
•
•
•
Source IP addresses are identical.
Destination IP addresses are identical.
IP streams are associated with the same IP platform.
Destination IP address is not in unicast range,
•
Multicast Addresses in DVB-H are globally defined
• Need IP matching since IP addresses are different in IP
Platforms…
•
From unicast/multicast to multicast
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How to Locate IP Streams
Elementary Stream Structure
188 bytes
4 bytes
Header
Payload
Header
Payload
Header
Payload
Packet
IDentifier
Sync
byte
Transport
error
indicator
Payload
unit start
indicator
Transport
priority
PID
8
1
1
1
13
Transport
scrambling
control
2
Adaptation
field
control
Continuity Adaptation
counter
field
2
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How to Locate IP Streams
Finding True PID
Program Association Table
Multiplex
PAT (pid=0)
1 100
Program Map Table
Service
Component
PMT (for pid=200)
elementary_stream (pid=1000)
2 200
10 A 1000
3 300
11 V 1100
VJDGHDGHKGHKFGHKFGRTUWRTZWWRZ
4 400
12 D 1200
HGJDGHNVBNRSTHWRTHWRTHWRTHRTH
13 D 1300
GHSHGJJJFGDDDDDDDDDDDDDDDDDDD
pmt_pid
AAAGASDGJHGHMHSHAGAAAAAAAAAAA
elementary_pid
Service_id
stream_type
component_tag
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1.
2.
3.
4.
5.
6.
7.
Find NIT_actual of the tuned
network
Find NIT_actual of the new network
which includes INT link_descriptor
Find service ID of INT table of the
platform we are interested in
Find the PID of the INT table for the
PMT
Find the PID of the IP service
(based on the IP Address) from INT
Find the PID of the IP Service for
the PMT
Find PID of the elementary stream
(IP Stream)
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Parameters for Optimum Handovers with
DVB-H
Parameters
Source
Remark
cell_id
cell_list_descriptor
TPS bits
Uniquely cell identifier for DVB-T/H
NIT
To announce cells and sub-cells of the DVB-H network
cell_frequency_link_descriptor
NIT
To announce all frequencies used to transmit the TS within the
DVB network
original_network_id
network_id
transport_stream_id
linkage_descriptor
service_id
component_tag
NIT
typically allocated by DVB on a per country basis
Platform_id
IP source/destination address
PID
INT
identifies an IP platform
INT
Identifies a single IP stream
PAT/PMT
Identifier for component_tag
NIT
PAT
Identifies uniquely an TS within an “original” DVB network
NIT
to announce INT
PMT
Identifies a DVB service
Identifier for a component of a DVB service
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IP Matching
• Platform_id and IP source/destination addresses
must be available in case there is no PID
available
•
•
•
Multicast IP addresses are uniquely defined, hence IP
addresses can be saved before
ESG (Electronic Service Guide) of DVB-H provides
IP Platform ID and IP Address of all available
service…
MIIS can provide with the ESG similar data enabling
faster IP Platform ID – IP address information
acquisition
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Handover Overview XDVB-H
• In case service exists over DVB-H make handover
decision
•
•
Else DAIDALOS could consider creating the service in case of
demand, but currently DVB-H would not…(no .21 problem)
They target customized services as the next steps…
• No resource availability check (avoid this)
• Inform DVB Network about the handover complete
(optional)
• Inform WLAN Network about handover complete
(optional)
•
Multicast leave can be synchronized with this information
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