Transcript Design and Implementation of ESG Server

Design and Implementation of an Electronic Service Guide
for Mobile Video Systems
Kaushik Choudhary
Simon Fraser University
Master’s Project Defense ● July 12, 2012
Outline
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Introduction
Background
Design and Implementation of ESG Server
Validation
Conclusion
Future Work
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Introduction – Why Mobile Video?
• In recent years, smartphones have been enhanced with
powerful hardware and sophisticated operating systems.
• Forecasts suggest that mobile devices will dominate
internet data traffic contributing as much as 48% of all
traffic. [Cisco 12]
• Video data contributed about 52% of all mobile data
traffic. This number is expected to grow to 69% by 2016.
[Cisco 12]
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Introduction – Why Mobile Video?
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Introduction – Why Mobile Video?
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Introduction – Why Mobile Video?
• To support this explosive growth in video
traffic, service providers need to make
massive investments to increase network
capacity.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Introduction – Why Mobile Video?
• A possible solution would be to use mobile broadcast
networks (e.g. DMB, DVB-H, CMMB, ISDB-T, ATSCM/H).
• Theoretically, broadcast networks support unlimited
number of users in a given network area.
• Using broadcast networks reduces video traffic load
by 60% in a given area during high-demand video
programs. [BMCO 09]
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Introduction – Problem Statement
Problem: Design and implement a service layer,
configurable, electronic service guide server.
Validate the server in a real mobile TV testbed.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Outline
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Introduction
Background
Design and Implementation of ESG Server
Validation
Conclusion
Future Work
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Background – DVB-H Standard
• Widely used, open, international standard.
• It provisions for reducing energy consumption on
mobile devices by broadcasting multimedia data
in bursts.
• Defines Physical and Link Layer protocols and
uses IP to interface with higher layer protocols
such as RTP and UDP.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Background – Electronic Service Guide
• To complete an end-to-end mobile TV system,
a set of service layer specification standards,
DVB-IPDC have been defined. [ETSI 06]
• The DVB-IPDC standard
– Defines higher layer protocols
– Enables cooperation with cellular networks such as UMTS.
– Enables bi-directional communication and supports
services like Electronic Service Guide(ESG).
– Defines XML based ESG
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Background – Electronic Service Guide
• ESG contains human readable information on the available
multimedia services.
• ESG also contains media initialization information used by the
mobile terminal to tune into the service selected by the user.
• From an implementation perspective, ESG operations require
encoding of XML files containing program listings, descriptions
and schedules and tuning information for transmission.
• These encoded XML files are transported over the FLUTE/IP
protocol.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Background – ESG Operations
• We implemented ESG Server on top of the mobile TV testbed
developed in Network Systems Lab.
• To support transmission of ESG files we also developed the
link layer signaling mechanism for DVB-H.
• The signaling mechanism is implemented through PSI/SI
tables – structures segmented into sections and inserted into
MPEG-2 Transport Stream (TS) packets periodically.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Background – DVB-IPDC Stack
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Outline
•
•
•
•
•
•
Introduction
Background
Design and Implementation of ESG Server
Validation
Conclusion
Future Work
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Design and Implementation – PSI/SI Tables
• We implement six essential PSI/SI tables configured
through an XML configuration file.
• There are two types of tables
– PSI tables - information about available services and
programs
– SI tables - network and tuning information for the
available services.
• Each of these tables are abstracted by the Table class
which stores the tables in a TS packet format generated
by the corresponding Pack function for each table.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Design and Implementation – PSI/SI Tables
• Sample code for population of Network
Information Table using configuration file
5 languageCode = ((lgI = lg.find(mtv.cfg_mgr->getLanguage()))
->second); // en
6 platformName = mtv.cfg_mgr->getPlatformName(); //SYTE-MTV-5
7 frequency = mtv.cfg_mgr -> getCarrierFrequency ();//690 MHz
8 bandwidth = (Bandwidth)mtv.cfg_mgr->getBandwidth();//MHZ8
• The Transmitter module of the testbed pops
and transmits the next PSI/SI table from a priority
queue on next broadcast time.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Design and Implementation – ESG Server
• ESG Operations
– ESG Bootstrap – ESG available, acquire them
– ESG Acquisition – Acquire and process ESG
– ESG Update – Update to latest versions
Kaushik Choudhary | Electronic Service Guide for Mobile Video
ESG Operations - Bootstrap
• The IP/MAC notification table signals
announces well known IP address for an ESG
Bootstrap stream.
• The stream contains the two descriptors
required for tuning into an ESG session
– ESGProviderDiscovery descriptor (XML file)
– ESGAccessDescriptor (binary file)
Kaushik Choudhary | Electronic Service Guide for Mobile Video
ESG Operations - Bootstrap
1 <?xml version ="1.0" encoding =" UTF -8" standalone =" no"?>
2 < ESGProviderDiscovery xmlns ="urn :dvb : ipdc : esgbs :2005
" xmlns :
mpeg7 ="urn : mpeg : mpeg7 : schema :2001 ">
3 < ServiceProvider format ="urn :oma :xml : bcast :sg:
fragments :1.0 ">
4 < ProviderURI >NSL Broadcast Service </ ProviderURI >
5 < ProviderName >NSL Broadcast Service </ ProviderName >
6 <ProviderID >1</ ProviderID >
7 </ ServiceProvider >
8 </ ESGProviderDiscovery >
Kaushik Choudhary | Electronic Service Guide for Mobile Video
ESG Operations - Acquisition
• To transport ESG acquisition information, the
server implements two processing operations
– ESG Representation
– ESG Encapsulation
• ESG Representation describes which ESG
fragments are transported in the current
session and in what format.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
ESG Operations - Acquisition
• ESG information is constitutes of independent
XML fragments.
• In the ESG Encapsulation process the XML
fragments are encapsulated in aggregated
containers for efficient transport.
• Each container structure has a header
indicating number and type of structures and
a body.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
ESG Operations - Update
• ESG information transported in containers can
be updated in two ways
– Update the container with a modification of the
Transport Object Identifier value of the File
Delivery Table (FLUTE).
– Update an ESG XML fragment version individually
(more efficient).
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Outline
•
•
•
•
•
•
Introduction
Background
Design and Implementation of ESG Server
Validation
Conclusion
Future Work
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation
• We use two different type of tools to validate
our implementation
– Offline TS file analyzers
– Online TS stream analyzers
• We use dvbSAM and DVBInspector offline TS
packet analyzers to verify our TS files.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation
• We also use a real mobile TV testbed
transmitting DVB-H signals with a real mobile
device receiving those signals.
• In the testbed, aside from manual inspection
of the mobile device, we use an online TS
analyzer software to verify our
implementation.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation – Experimental Setup
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation – Offline analysis
Offline TS packet analyzer DVBInspector
Online TS stream analyzer DiviCatch
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation – Online analysis
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation – Online analysis
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Validation – ESG
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Outline
•
•
•
•
•
•
Introduction
Background
Design and Implementation of ESG Server
Validation
Conclusion
Future Work
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Conclusion
• We implemented a C++ based, open source
ESG server for mobile TV testbed based on
DVB-H.
• We chose DVB-IPDC standard for ESG as it has
provisions to interoperate with cellular
technologies like 3G/UMTS.
• We validated our implementation on a real
mobile TV testbed.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Outline
•
•
•
•
•
•
Introduction
Background
Design and Implementation of ESG Server
Validation
Conclusion
Future Work
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Future Work
• Ratification of DVB-IPDC 2.0 standard will allow
us to extend this project to implement interactive
services like video on demand.
• We could implement a hybrid delivery
mechanism for using DVB-H along with 3G/UMTS,
LTE, WiMAX or other network technologies.
• We could also implement a multiple technology
multimedia testbed as an extension to this
project.
Kaushik Choudhary | Electronic Service Guide for Mobile Video
Thank you!