【正文】 Actuators Active Routers: Active work routers Soft state Interchangeable Bases: Scalable, available servers Persistent state Service discovery Publickey infrastructure Databases Home Base User state Email User tracking ―Smart Spaces‖ 65 ProActive Infrastructure (Brewer, PI。 Delivery Classes ? Extend Testbed ?With Ericsson’s assistance, integrate GSM widearea connectivity ? GloMoWide ―Eye Watering Demo‖ ? Extensive use of proxies, distribution of VHO code 53 Original Research Plan Y e ar 1 Y e ar 2 Y e ar 3T 1: O v er la y Int e r ne t w or kM a na g e m e nt S e r vi c e sT 2: M obi l e A ppl i c a t i onS upp or t S e r vi c e sO 1: W i de A r e a D e pl o ym e nta nd D e m ons t r a t i onO 2: P i l ot A ppl i c a t i onD e m on s t r a t i onsMeas u r e amp。 Performance discovery – Network: meeting performance ―promises‖ for classes of users and types of data 187。 Transport over Satellites Tom Henderson 187。 A/V Data Types over Wireless – ProxyAware API, Kerberos Integration – Delivery Class Abstraction – Scalable Wireline Processing for Mobiles Impact ? Fundamental technology for 21st century battlefield munications: support for wide diversity of hybrid amp。 Beyond Third Generation, Randy Katz 1000 1030 Break 1030 1200 New Directions, Continued 187。 ELN。 Eval Wireless Ovrly Technologies Initial Architectural Specification Early Prototype Proxies (110 users) Scaled Architectural Specification Proto Scaled Proxies (1001000 Users) Large Scale Scalability Demonstrations Demo inbuilding ovrlys amp。 Bases: large centers of storage amp。 TCP over high error rate links (snoop) ? Support services for mobile applications – Data type specific pression (proxy distillation) and progressive transmission – Dynamic applications partitioning across wireless links (service discovery and adaptation。 WingMan Browser, MASH MediaBoard/Proxy integration, many new aggregation and annotation services ? Overlay Networks – Satellite Transport Protocol – Multicast over Satellite (Hughes) – TCP enhancements: support for asymmetric connections, integrated congestion control and loss recovery, short transaction transport connections, sessionorientation ? ApplicationNetwork Interaction – Shared Passive Network Performance Discovery – Mobility Service Architecture and Service Discovery in MASH CoLab 47 Wingman Browser ? Proxyenabled web browser for thin clients – Page layout determined on proxy side – Full distillation, refinement support – Thin drawing layer on PDA side Unwired Pla (HDML) 48 Satellite Transport Protocol (collaboration with Hughes) ? Most of our work done in the concept of TCP, but … ? Satellite links are not like WLANs – Very high latency, well protected link, high bandwidth ? Strategies borrowed from ATM SSCOP – Poll/Stat handshake 187。 Heterogeneous Access – Command Post – Disaster Relief – Remote Clinic – Organization w/poor Inter connectivity High Bandwidth Low Bandwidth 15 Battlefield Rear Area ATM Backbone XXI Century Battlefield Architecture Radio Access Point Packet Radio Network 16 DARTNet II CAIRN BARWAN Testbed Metri DirecPC DBS (1 mbps) LOS Wireless Cable (6 mbps) Cellular Modem Cellular Packet Data Packet Radio 1030 kbps Vertical HandOff 17 ClientPROXYServer Architecture Proxy Well Connected Poorly Connected ? Proxy – Mediates between wireless and wireline environment – Ideally executes at ―wellconnected‖ boundary of interwork – Manages caches and chooses transport data representations onthefly – Trade transcoding time against munications time 18 Overlay Network Challenge T y p e o fN e t w o r kB a n d w i d t h L a t e n c y M o b i l i t y T y p V i d e oP e r f o r m a n c eT y p A u d i oP e r f o r m a n c eI n B u i l d i n g 1 M b p sC o m m ’ l R F : 2 M b p sR e s e a r c h I R : 5 0 M b p s 3 m s P e d e s t r i a n 2 W a y ’ r a c t i v eF u l l F r a m e R a t e( C o m p )H i g h Q u a l i t y1 6 b i t S a m p l e s2 2 K H z R a t eC a m p u s A r e aP a c k e t R e l a yN e t w o r k 6 4 K b p s 1 0 0 m s P e d e s t r i a n M e d . Q u a l i t yS l o w S c a nM e d . Q u a l i t yR e d u c e d R a t eM e t r o A r e a( W i r e l e s sC a b l e )1 0 3 0 m b p s( o n e w a y , L O S ) 1 0 m s S t a t i o n a r y 2 W a y 39。 h/os with dynamic b/w alloc Scaled Proxies (100010000 Users) Demo widearea ovrlys amp。 Eval Wireless Ovrly Technologies Initial Architectural Specification Early Prototype Proxies (110 users) Scaled Architectural Specification Proto Scaled Proxies (1001000 Users) Large Scale Scalability Demonstrations Demo inbuilding ovrlys amp。 Checkout 1030 1200 Sponsor Feedback Session, Randy Katz 1200 1300 Lunch 1300 Depart Granlibakkan 11 Presentation Outline ? Retreat Purpose and Agenda ? Project Objectives, Motivation, and Approach ? Project and Testbed Status ? Technology Developments ? Review Project Plan ? New Directions ? Summary and Conclusions 12 Heterogeneous Mobile Computing ? Access ? Anytime, Anywhere – WideArea Coverage – Scalable Processing – Highly Available Operation ? Easily – Transparent Access – Localized Service ? Securely – Global Authentication ? Any Medium – Multimedia: Audio/Video/Graphics ? Timely – Performance ? Cost Effective