next generation wireless networks · 2010. 11. 5. · 3g, hsdpa, evdo, wi-fi ... optim. content...
TRANSCRIPT
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Next Generation Wireless Networks: Bringing Mass Appeal to 4G+
Constantine D. PolychronopoulosBytemobile, Inc., and
University of Illinois at Urbana-Champaign
Onassis Foundation Science Lecture Series 2008ITE – CreteJuly 2008
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Mobility + Wireless = Technology Innovation
2007-2010 may be to Ubiquitous Multimedia what 1993-1996 was to the Internet
- 2007: the beginning of the main phase of the next revolution:
- Ubiquitous Multimedia through converged networks
- 2010 and beyond: The Global Medianet- Instantaneous, ubiquitous multimedia communications- High-speed connectivity is omnipresent- Focus on services and applications
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The Silent Revolution• Unification of two separate worlds:
– Data applications (Internet)– Telecommunications
• The key tactical ingredients of the new revolution: – Wireless broadband is coming of age– Mobility– Convergence– Device evolution (embedded systems)
• The strategic ingredient of the new revolution: – Embedded Intelligence: Intelligent access networks
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What is Convergence?
Network Identity
Application Identity
Device & User Identity
User
Multiple Devices
One User
A “Single” Global Access Network
802.11a
GPRS
PSTN
LAN
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The Global Medianet
“One” global, transparent network,
same rich multimedia services
any time, anywhere
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Overview of Wireless Network Architecture
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Internet
Smart, Next-Generation Networks: Focus on service
3G, HSDPA, EVDO, Wi-FiWi-Max, …
. . .Interactive, integrated multimedia
Filtering and security
Monitoring and charging
Optimization and QoSLocation awareness
Customized user experience
Mobility and roaming
Intelligent IP Core
From simple connectivity to networks that sense, locate, react, customize, filter, charge, unify, simplify: Toward a global service network
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Internet
3G 4G
Wi-Fi
Wi-Max
DSL, dial-up, other
wired
Intelligent IP Content Delivery
OptimizationQoS - Traffic Management
Charging
Content Filtering
Security
Location GTWIMS
MGCP
MMSIPTV Games
Streaming Video InternetEmail/IM
Premium ContentVoIP
IP Services Core
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Internet
2G2.5G3G3.5G 4G
IP Services Core
Wi-Fi
WiMAX
DSL, cable, dial-up,
other wired
Roaming
Optimization as a network requirement
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Many limitations: Wide range of mobile devices
• Wireless Workers• Infotainment Elites
• Fun Fanatics• Utility Workers• Infotainment Consumers
• Mobile Masses• Information Deniers
Smart-phones
Full-HTML Browser
Mid-Range Feature PhonesLimited-HTML Browser
Low-End Handsets
WAP 2.0
Consumer SegmentsDevice by Market Size
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Users Get:
Limited Access to the Internet
• Low end browsers – cannot support most websites
• Limited open access – majority of accessible content is on the ‘mobile Internet’
• Limited video or multimedia support
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• ‘Dial-up like’ network speeds• Series of links/directories on
many mobile sites – difficult to navigate, extra loading time
• Non-qwerty keyboard handsets slow down browsing
Slow, Cumbersome Experience
Users Get:
High cost of access to the same content they get for free on their PCs
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Intelligent IP Core Networks • Can address most, if not all, client, server and
bearer layer limitations:– Optimization– Content adaptation – Security – Video optimization (transcoding & transrating)– Multimedia adaptation – Location based services– Traffic monitoring and flow throttling– QoE
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Performance
Usability
Content Accessibility
Intelligent Content Adaptation: Open Internet for all devices
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Examples
• Handling frames• Content translation• Server side rendering execution (e.g. Javascript)• Page splitting• Ad Insertion
Content Modifying
• Device Database Aware• Data Streamlining• Image Resizing, Compression• Dynamic Multipart Packaging• Content Tagging (Caching Enhancement)• Enhanced Browser Rendering (e.g. Fit-to-screen)
Content Transparent
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Content Adaptation Architecture
Content from Origin Server Content & Adaptation Rules
Adapted Content
Final Content to device
Decision EngineAdaptation Engine
Presentation Engine
Configuration &
Static Rules
Device Profile
Network Profile
Subsc
riber
Profile
Content Insertion (Ads, Promotions)
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Example: Content FoldingMenu links are folded into a drop down menu User clicks the menu to expand the content
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Example: Click-to-Call Control
Automatically replace phone numbers with hyperlinksUsers can place a call directly by clicking on the linkClick-to-Call links use native phone functionalityIf phone does not support any click-to-talk format, no conversion is performedSimilar adaptation for Click-to-Email
Just dial 1 800 123-4567 and say
Calling...
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Multimedia Optimization – Functional Architecture
Deep Packet Inspection – Packet Classification
Intelligent Caching
Media Gateway and Codec Optimization
Frame Composition – Dynamic Bit/Frame-rateApplication QoS Optimization
Channel Monitoring (Players/prot) – Traffic Shaping – QoSRTSP & RTP/RTCP Optimization
Media Proxy
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Downloadable Media vs. Embedded Media
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Optimizing Downloadable Media
User can be presented with an option to• Stream the media (RTSP), or• Download the media (via
HTTP)
MIG
HTML Page with embedded links(e.g., HTTP://....filename.wmv)
When user clicks URL, redirected to RTSP://....unique_token
Multimedia Transcoding
Mapping between token and URL
Adjust bandwidth to network and phone capabilitiesEnsure codec compatibilityRTSP more appropriate for dynamic wireless environment
Progressive Download to Streaming Conversion
Download or Stream?
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Dynamic Discovery for Embedded Media
Original YouTube video encoded in Flash (450x370)
and downloaded via HTTP at 300 kbps
New video format is QCIF (176x144) and 3GPP/MPEG4 downloaded via RTSP/RTP at
120 kbps
Dynamic Media Discovery of Flash, Windows (WMV, WMA),
MPEG-2, MPEG-4, MP3
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Bring Multimedia to Your Mobile Phone
Embedded player is replaced with• Configurable icon, or
• Still image of first video frame, or
• Animated GIF of first few seconds
Multimedia Transcoding
Mapping between token and URL
ContentAdaptation
HTML Page with embedded code(e.g., EMBED SRC= “application.swf”)
Embedded links replaced with(e.g., RTSP://....unique_token)
MIG
With Discovery of Embedded Media
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Media OptimizationRe-sizing• To fit the screen useCodec selection• Codec supported by the device• Most efficient codecBit rate reduction• Lossy compression / Frame reduction• Based on device capabilities, RTSP feedback, and
operator settingsDynamic bandwidth shaping• Recursive feedback control models
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Dynamic Bandwidth Shaping
Media function constantly monitors the network connection with the client and shapes the multimedia stream to adapt to current network conditions.
Ensures uninterrupted streams at optimal rates.
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Real-Time Constraints for Communication Apps
Playback Buffer
Packet generation
Networkdelay
Buffer Playback
T
Seq
uenc
e nu
mbe
r
ime
Packetarrival
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Optimization
The Mobile Internet Gateway (MIG) Architecture
New or3rd partyServices
Security Traffic Shaping Charging Other….
FlowSwitching
FlowCategorization
Deep Packet Inspection Tunneling QoS
PolicyEnforcement
Point
Integration APIs Load Balancing & Chaining
Management & Reporting Signaling APIs Low level
Stats Generation
IBM BladeCenter Sun Blade ServersHP e-series Platforms ATCA Platform
DeviceOptim.
Content Adaptation
Next Gen WAP
Content Filtering
Media Optimization ISNAd
Insertion
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Next Generation Network Elements (NGNE): The big challenge
Virus detectionemail attchms Spam detection Content Filtering Content
transcoding…
Packet Inspection – Service Tagging – Service Sellection
Network traffic monitoring
Flow-level traffic management
Tunneling – Policy Routing – Traffic Aggregation & Management
Socket layer
Policy enforcement
Other
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NGNE Performance Limitations
BackplaneInterconnect
(switching fabric)
NP 0
NP 1
NP k-1 CPUm-1 Mem
CPU0 Mem
CPU1 Mem
Contr
Basic requirements
- 10Gbps real-time switching and application level servicing
- 1<= k <= 16, and 1<= m <= 32
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Rich, high impact research problemsTraffic Engineering• Deep packet inspection • Flow classification (stateful?)• QoS and QoE (policy enforcement, user centric QoS)Dynamic Media Optimization • Media discovery• Video optimization Convergence • Mobility support• Transparent adaptation Next Generation Network Elements• New massively scalable architectures