Context-Aware Converged Communications B.H. Juang

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1 Context-Aware Converged Communications B.H. Juang Motorola Foundation Chair Professor & Georgia Research Alliance Eminent Scholar School of Electrical & Computer Engineering Georgia Institute of Technology

2 Communication Services Today IN Perspective Billing Mngmt SCE SMS Web Server App Server IP / Data Network Internet SIP ISP SN/IP VMS INAP SS7 Network ISUP INAP SCP HLR Freephone * Prepaid / Card Call Center * LNP, LTF/LIDB Call Screening * Messaging * VPN Call Routing * Web based Provisioning *... Circuit Switch Transport Access After Kozik

3 Towards Converged Voice/Internet Services Billing Mngmt SCE SMS VoiceXML, WML, HTML, SIP,... Web Server App Server IP / Data Network Internet SIP SCP HLR INAP SS7 Network Application Server ISUP INAP SIP, LDAP, XML, IN, SCTP/TALI, Corba, Jain, Parlay Packet Call Center * Online Comm. Center * Virtual Kiosk * Mediation Voice Portals * Message Gateway * Voice / Data VPN *... ISP SN/IP VMS Only an intermediate solution!! Circuit Switch Transport Access After Kozik

4 Example Multiparty Communication Services Business model: Service provider = IP server + feature server Call Cont. Server ISP site Interest group Chat Room Call Session MGCP MEGACO RTP Media Bridge Controller Media Bridge server RTP RTP client MPC Applet Suite Control MPC Applet Suite Whiteboard, Text, Audio (EC/Codec), Video, Signaling/directory MPC Applet Suite MPC Applet Suite RTP Peer-to-peer (side-bar) audio whisper, copy files Stream file, share files Media data

5 NTT s Resonant Communication Networks mostly IN

6 Context-Aware Communications Context Sensing Context Inference Context Representation and Translation User/Application Context Determination Media Communication Chain Information Management Content Processing Network Architecture Communication & Networking

7 Architectural Evolution AIN Service Adjunct Operations Systems SM Intelligent Peripheral SSP: Service switching point SCP CCS (SS7) Network Service management systems STP CCN (Context-sensitive Converged Networks) Digital Terminal Context-Sensitive Information Management Systems Multimedia Service Complex Wired or wireless CSC CSC (Context & Service Control) Network CSSP: Converged Service switching point Service Management Systems To other CSCs Digital Terminal

Network Architecture for CCN Application Layer Session Control Flow Registration Address Authentication Authentication for Other Party Authentication Status Check Connection Negotiation Connection

8 Network Architecture for CCN Application Layer Session Control Flow Registration Address Authentication Authentication for Other Party Authentication Status Check Connection Negotiation Connection Processing Context Service Control Layer Access Control Network Control Layer Encryption Control Quality Control Context Control CSC IP Transport Layer session End-to-end Session Control Modified from Tachimoto & Morita of NTT

9 Dimensions of Context CONTEXT user environment applications Personal Attributes Preferences Local Resources Physical Information Service Agreements Expectations & Goals Spatial Temporal/history Activity-Related Network Computing Display Physiological

10 Sensors in the Labs at Gatech Video Audio Wireless

11 Devices for Aging in Place EKG from Control EKG from GTWM

12 Multi-channel Hi-Fi Telecommunication Traditional telephony switch trunk switch New multi-channel network for information sharing Mic s Cameras Multichannel Aggregate Processor MIMO Packet Network Multichannel Aggregate Processor MIMO Spkr s Projectors or for intelligent assistance

13 Spatialization & The Perceptual Dimension Sound spatialization makes talker-tracking easier in multi-party conferencing environments, resulting in improved effectiveness in communication Binaural Hearing & Cocktail Party Effect Spatial separation plays a role. Compare mono with stereo Stream segregation also plays a role. Compare one talker (m1+m2) with two (m1+f2) (m1 m2 f2 ) Stereophonic Conferencing Demonstration

14 Multi-channel Communications Human communication is a spatial-temporal event. It is important to track the source objects.

15 Stereophonic Acoustic Echo Cancellation NL NL h 2 ~ ~ g h 1 h 1 h 2 2 g 1 talker - + ROOM 1 ROOM 2

16 Multi-channel Source Separation s 1 h11 + s2 h21 s 1 H 11 x 1 W 11 s 1 H 12 W 12 H 21 W 21 s 2 H 22 x 2 W 22 s 2 mixing (room impulse responses) s 1 h12 + s2 h22 un-mixing One possible approach (Ikram of Gatech and Morgan of Bell Labs): x = H s R = <x x H > s = Wx Find un-mixing filter matrix W such that Λ s = W R W H is diagonalized by minimizing the squared Frobenius norm of the off-diagonal matrix of Λ s

17 Sound Source Localization 1. Time Delay Estimation 2. Source Location Estimation Various methods: triangulation - solve a set of hyperbolic equations spherical intersection - solve a set of linearized spherical equations spherical interpolation - similar to SI, but with reduced constraint one-step-least-squares transforms the problem into an estimation/minimization problem; works the best Applications: Developed at Bell Labs & Georgia Tech Conferencing with participant tracking Improved sound and sight pickup talker Further challenge

18 The Content Processing Chain CONTENT CONTENT ACQUISITION & RETRIEVAL CONTENT ENCODING USER INTERFACE Context Determination CONTENT DISTRIBUTION CONTENT PRESENTATTION CONTENT DECODING

19 Managing Content for CAC Semantic Metadata Back End Applications Produce Aggregate Catalog/ Index Integrate Syndicate Personalize Interactive Marketing Where is the content? Whose is it? What is this content about? What other content is it related to? What is the right content for this user? What is the best way to utilize and interact with this content? Semantic Metadata Broadcast, Wireline, Wireless, Interactive TV

20 Communication with Region-of-Interest ROI Algorithms for: Lossless Coding Progressive Transmission Electronic Zooming Integration with VoIP, VUI, TIVO and Array Processing Technologies

selective retransmission Over-provisioning / Packet Loss

21 Context-Aware Content Distribution Multimedia Transport Protocol - MMTP UDP + FEC+ error concealment UDP+ MMTP + selective retransmission Over-provisioning / Packet Loss Rate for Perfect Q: 7 for UDP 2 for MMTP [Theoretical Limit is 1]

22 Embedded and Layered Coding telephone NETWORK Voice packet 3 2 Switch 1 Switch 2 Switch 4 Switch 3 Cell site Layered bitstream cell-phone Channel coding

23 Information Management & Support Layers MetaServices Adaptive and Customized Information Services Context Management

24 Context-Aware Convergent Communications Research Vision Imbue Converging Digital Services with the attributes and perception of personalization, flexibility, richness and privacy; Incorporate Context, broadly defined, into the deep fabric of wired and wireless networks for information, transactions and entertainment; Harness the capabilities of multimedia processing, embedded computing and pervasive broadband for Context-Aware Telecommunications; Spawn a new generation of applications of interest to the end user, the communications industry and society, using the exemplary test domains of tele-health, distributed education and entertainment.

25 Summary Convergent & Converged Communication Networks need research advances in: Infrastructure for User-Centric Converged Services Context-Aware Media Processing Context-Aware Information Management The Science and Engineering of Context

Signaling System 7 (SS7) By : Ali Mustafa

Signaling System 7 (SS7) By : Ali Mustafa Contents Types of Signaling SS7 Signaling SS7 Protocol Architecture SS7 Network Architecture Basic Call Setup SS7 Applications SS7/IP Inter-working VoIP Network