Transcript Towards Wireless Overlay Network Architectures

NINJA:
A Service
Architecture for
Internet-Scale
Systems
Randy H. Katz
UMC Distinguished Professor
and Chair, EECS Department
University of California, Berkeley
Berkeley, CA 94720-1776
[email protected]
Ninjutsu is a stealth and espionage-oriented art which saw its greatest development in the 13th to early 17th centuries in
Japan. Its practitioners, the ninja, were warrior-assassin-spies; most belonged to the Iga and Koga mountain clans. They
were the supreme reconnaissance experts and saboteurs of their day.
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Presentation Outline
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Internet-Scale Systems
A New Service Architecture
Integration of Computing and Communications
Opportunity for Cooperation
Summary and Conclusion
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Presentation Outline
•
•
•
•
•
Internet-Scale Systems
A New Service Architecture
Integration of Computing and Communications
Opportunity for Cooperation
Summary and Conclusion
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Internet-Scale Systems
• Extremely large, complex, distributed,
heterogeneous, with continuous and rapid
introduction of new technologies
• Feasible architectures
– Decentralized, scalable algorithms
– Dynamically deployed agents where they are needed;
“Big infrastructure, small clients”
– Incremental processing/communications growth
– Careful violation of traditional layering
• Implementation approach based on incremental
prototyping, deployment, evaluation,
experimentation
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Emerging Communications
Infrastructure of the Future
• The Challenge
– Network-based applications becoming increasingly service
intensive
– Computational resources embedded in the switching fabric
– Dealing with heterogeneity, true utility functionality, security &
service discovery, in an open, extensible network environment
• Computing
– Legacy servers
– Partition functionality for “small” clients
• Communications
– High bandwidth backbones plus diverse access networks
» Third generation cellular systems
» Home networking
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“From POTS to PANS:
Telecommunications in Transition”
“Today, the telecommunications sector is beginning to
reshape itself, from a vertically to a horizontally
structured industry. … [I]t used to be that new
capabilities were driven primarily by the carriers.
Now, they are beginning to be driven by the users. …
There’s a universe of people out there who have a
much better idea than we do of what key applications
are, so why not give those folks the opportunity to
realize them. … The smarts have to be buried in the
‘middleware’ of the network, but that is going to
change as more-capable user equipment is
distributed throughout the network. When it does, the
economics of this industry may also change.”
George Heilmeier, Chairman Emeritus, Bellcore
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Motivation: Why Can’t We ...
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Control the A/V equipment in this room
Get driving directions over the phone
Affect other’s calendars directly
Screen our calls based on the caller
Control things with the interface we want
Manage/sort/search our e-mail/v-mail/fax/news
intelligently
Needed: Ubiquitous connectivity and
intelligent processing supported by the
network
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NINJA: A Service Architecture
that Provides ...
• Tinkertoy wide-area components
• Automatic discovery, composition, and use
• Powerful operators: clusters, databases, and
agents
• Viable component economics: subscription, pay
per use
• Supports great devices, sensors, actuators
• Connects everything: ubiquitous support for
access and mobility
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NINJA Computing Platform
Units
Active
routers
• Information
Devices
(~10
Billion)
• Connected
Stationary
Computers
(~100 Million)
Bases
• Scalable
Servers
(~Million)
“Small Devices, Big Infrastructure”
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NINJA Computing
Infrastructure
Server
Client
Proxy
Router
Compute
Node
• Computing resources
inside the routing topology,
not just at the leaves
• Paths chosen for location
of operators as much as for
shortest # of hops
• Mobile code that
specializes the services
provided by servers
• Mobility, management of
bottleneck links,
“integration” services,
service handoff
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NINJA Builds on Berkeley’s Systems
Building Expertise
BARWAN
Wireless Overlay Networks
Scalable Proxies
vic, vat,
wb
TranSend
TACC Model
Wireless Access
NINJA
Scalable, Secure Services
Computation in the Network
“Smart Spaces” as an app
Event-Response
Programmable Access
RTPGateway
Service Discovery
MASH
Collaboration Applications
Active Services
MASH Toolkit
Active Services
Model
NOW/Millennium
Computing Platform
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BARWAN Wireless Overlays:
Ubiquitous Connectivity
Satellite
Regional Area
Low-tier
High-tier
Local Area
Wide Area
High Mobility
Low Mobility
Seamless mobility among local and wide-area
wireless networks via vertical handoff
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$
$
$
Cache control
BARWAN Proxies: Scalable Support
for Heterogeneous Clients
To Internet
NOW Cluster
SAN (high speed)
Utility (10baseT)
Coordination bus
html
Front
End
gif
PTM
jpg
Control
Panel
$
Cache partition
...
Datatype-specific distiller
BARWAN: Support for Thin Clients
• Top Gun Wingman
– World’s only graphical browser
for PalmPilot
– Greater than 10,000 users
worldwide
• Top Gun MediaBoard
– Combines MASH tools with
proxy
– Interoperates with laptops,
workstations
Superiority of proxy-based approach to enabling
“thin” clients successfully demonstrated
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Presentation Outline
•
•
•
•
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Internet-Scale Systems
A New Service Architecture
Integration of Computing and Communications
Opportunity for Cooperation
Summary and Conclusion
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Vertically Integrated Services vs.
Component Services
Vertically Integrated Services
Component Services
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Fixed composition
Static deployment
No reuse
Mixed presentation/data
Fixed UI
Worse pieces
Dynamic composition
Rapid deployment
Reuse
Data only
UI defined dynamically -based on device/connection
• Competition at every level
NINJA Service Architecture:
Basic Elements of the Model
Units:
–
–
–
–
sensors/actuators
PDAs/SmartPhones
Laptops, PCs, NCs
heterogeneous
Active Routers:
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soft-state
basestations
localization
local mobility support
Bases:
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highly available
persistent state
databases
computing
agents
“home” base per user
“global” mobility support
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NINJA Active Infrastructure
“Smart Spaces”
Active Routers:
Active network routers
Soft state
Interchangeable
Bases:
Scalable, available servers
Persistent state
Service discovery
Public-key infrastructure
Databases
Home Base
Units:
Client Devices
Sensors & Actuators
User state
E-mail
User tracking
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Example: Thin Client Access to
Legacy Server
PDA
AR
Legacy
Server
Personalization
AR
Base
Base
Home
Base
AR
AR
Unit
Sensor
Unit
Sensor
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Example: Sensor Aggregation
PDA
AR
Legacy
Server
AR
Base
Base
Agent
Aggregator
AR
AR
Unit
Sensor
Unit
Sensor
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Example: TopGun
WingMan/Mediaboard Operation
PDA
Legacy
Server
Image Converter
AR
PDA Proxy
Base
MediaBoard
Un-Zip
Multicast
Connector
Aggregator
PC
AR
Mic
Camera
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NINJA Service Architecture
• Operators/Connectors/Interfaces
• Paths
– Wide-Area Paths
– Interface Interconnection
– Path Optimization
• Services
– Service Discovery
– Automatic Path Generation
• Example Applications
– Universal remote control/smart spaces
– Universal In-Box/Personal Information Management
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Operators/Connectors
Operators:
– transformation
– aggregation
– agents
Connectors:
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abstract wires
ADUs
varying semantics
uni/multicast
Interfaces:
–
–
–
–
strongly typed
language independent
set of AM handlers
Leverage all COM objects
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Wide-Area Paths
• Path is a first-class entity
• Explicit or automatic creation
• Can change dynamically
– change path or operators
• Unit of authentication: delegate along the path
• Unit of resource allocation
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WAN Paths: Economics
• Key Idea: securely delegate authority to any
path component
– access your e-mail remotely
– authorized services (subscriptions)
– authenticated sensor data
• Digicash:
– Pay-per-use services
– Can be one-time (or subscription)
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WAN Paths: Optimization
• Insert operators into the path:
– forward error-correction,
e.g., for error-prone wireless links
– compression/decompression,
e.g., bandwidth constrained links
• Change parameters
– retransmission windows
– settings for wireless or satellites
• Reroute path dynamically
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Connecting Interfaces
• Goal: trivial to connect
– can be automated
• Connectors are polymorphic
– wires carry a generic ADU of type T
– automatic marshall/unmarshall
» code must be created at instantiation
• Enables automated connection and use
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Interoperability
• Wrapper operators for legacy servers
– HotBot, Zip2, Patent server
– Generic wrappers for each MIME type
• Connectors use TCP, UDP, multicast
• Leverage COM objects as operators
– Control Excel remotely
– Lots of third party components
• ODBC/JDBC databases
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Services
• Service
– Highly available program with fixed interface at a fixed
location
• Strongly Typed Interfaces
– Multiple services of a given type compete
– Compete on location, price, robustness, “quality”, brand
name
• Service Discovery
– Find “best” service of given type
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Automatic Path Creation
• Query goal is path creation
• Find logical path of operators
– Path must type check
• Place operators on nodes
– Some operators have affinity
– Place them first
• Add connectors as needed
• Create any authentication keys
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Service Discovery and Use
Four basic steps:
• Find a local Active Router
• Query Service-discovery service
• Automatic path creation, including transformations
• Generate UI from interface specification
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Application: Universal Remote Control
• Adapt device functionality to
services in new environment
– Beacon augmentation
– Adaptive user interfaces
– Composed behaviors
• Deployment within our building
Universal Interaction?
– Light, video, slide projector, VCR,
audio receiver, camera, monitor, A/V
switcher control
– Local DNS/NTP/SMTP servers, HTTP
proxies, RTP/multicast gateways
– Audited printer access
– Interactive floor maps, protocols for
advertising object locations
– Coarse-grained user tracking
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Generalization: Smart Spaces
• Walk into a A/V room and control everything
with your own wireless PDA
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Services for each device
Automated discovery and use
Automated UI generation
Composite behaviors
Local scope, no authentication (yet)
• Phones as well as PalmPilots
– Speech-enabled control
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Experimental Testbed
Fax
IBM
WorkPad
Image/OCR
Text
Speech
MC-16
Ericsson
CF788
306 Soda
Motorola
Pagewriter 2000
WLAN
405 Soda
326 Soda “Colab”
Pager
GSM BTS
Network
Infrastructure
Millennium Cluster
Smart Spaces
Personal Information Management
Millennium Cluster
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Target Applications:
Personal Information Management
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Universal Inbox: e-mail, news, fax, voice mail
Notification: e-mail, pager
Priorities, Folders, Search
Access: internet or telephone
Peer-to-peer calendar
Control of environment
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Personal Information
Management
Speech-to-Voice Mail
Speech-to-Voice Attached-Email
Call-to-Pager/Email Notification
Email-to-Speech
All compositions
of the above!
Universal In-box
Policy-based
Location-based
Activity-based
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Presentation Outline
•
•
•
•
•
Internet-Scale Systems
A New Service Architecture
Integration of Computing and Communications
Opportunity for Cooperation
Summary and Conclusion
37
Current Vision of 3rd Generation Cellular
PSTN
ISDN
Circuit-Sw itched
64 kbit/s trunks
Internet
Direct IP-Access
for CS Data
CS-based
"core-GSM
network"
SS7-based
Signalling
GSM BSS
Circuit-Sw itched
Voice
Circuit-Sw itched
Data (HSCSD)
GPRS IP-Backbone
UMTS BSS
Packet-Sw itched
Data (GPRS)
3rd Generation Radio
Circuit-Switching (CS)
Paket-Switching /
IP-Routing
Vision for Beyond 3rd Generation Cellular
PSTN
ISDN
CS / IP
Gatew ay
Internet
High Bandw idth
Trunks
IP-based
"core-GSM
network"
IP-Sw itching
Backbone
Mobile-IP & RSVPbased Signalling
Voice & Data
ov er IP ov er GPRS
GSM BSS
QoS Support
in GPRS
IP-Multicast
Proxies
(Security, Transcoding)
UMTS BSS
3rd Generation Radio
ICEBERG
Vision
• How far can we go
with a packetswitched cellular
core network?
• How do you
provision an IP
network for large
numbers of voice
users?
• What new kinds of
data-oriented
services can be
deployed?
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Mobility Management
• Mobile IP-GSM Mobility Interworking
– Mobile IP-GSM authentication interworking
– GSM HLR/VLR interaction in an Internet signaling context
– Scalability of Mobile IP/hierarchical agents
• Multicast support for mobility
– Alternative approach for mobility based on M/C addresses
– Exploit multicast routing to reach mobile nodes without explicit
handoff
– Combine with real-time delivery of voice and video
• Generalized redirection agents
– Policy-based redirection: e.g., 1-800 service, email to pagers, etc.
– Redirection agents collocated with multicast tree branching
points
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Packet Scheduling
• Validated VINT modeling suite for GSM media
access, link layer, routing, and transport layers
– GSM channel error models
– Better understanding of sources of latency in cellular link and
methods to circumvent this
• QoS-aware High Speed Circuit Switched Data
(HSCSD), General Packet Radio System (GPRS),
and Wideband CDMA (W-CDMA) link scheduling
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RSVP signaling integration with bottleneck link scheduling
Fairness and utilization for TCP and RTP flows
Delay bound scheduling for R/T streams
Exploiting asymmetries in downstream/upstream slot
assignment, CDMA self-interference
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New Services
• Proxies for Telephony-Computing Integration
– GSM-vat-RTP interworking: handset-computer integration
– Encapsulating complex data transformations
» Speech-to-text, text-to-speech
– Composition of services
» Voice mail-to-email, email-to-voice mail
– Location-aware information services
» E.g., traffic reports
– Multicast-enabled information services
» Multilayered multicast: increasing level of detail as number
of subscribed layers increase
• Demonstrate the speed and ease with which new
services can be developed
• Develop innovative new services at the intersection
of voice and data
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Potentially Any Network Service (PANS)
Same service in different networks
Service handoff between networks
2-way Paging
GSM
PSTN
IAP
IAP
IAP
E.g., “follow me” service
e.g., any-to-any service
IP
IAP
WIP
IAP
Iceberg Access Points
(Beyond H.323 gateways)
• Provide policy engine
• Handle routing, security
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PANS Issues
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Entities: What are the endpoints?
Naming: “What’s in a name?”
Authentication: Entity to Entity authentication
Billing: Charging entities, not “lines”
Routing: QoS and cost issues
Source conversion: Text-to-Speech, etc.
Network management: Monitoring, provisioning
Intelligent terminals: Services at the terminal
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Service Mobility as a
First-Class Object
“Randy@Berkeley”
Universal Names: Globally unique IDs
An Entity has a universal
name and a profile;
Entities are people or
processes
OfficePSTN (Teaching): 510-642-8778
OfficePSTN (Chair): 510-642-0253
DeskIP: dreadnaught.cs.berkeley.edu:555
LaptopIP: polo.cs.berkeley.edu:555
PCS: 510-388-8778
Cellular: 510-409-6040
E-mail: [email protected]
Home: 415-777-3382
Profile: set of
domain-specific names
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Iceberg Inter-Domain Naming
Protocol
• Naming:
– Reuse network’s local naming services
– Single resolution point for universal names
• Routing:
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Handles inter-network signaling
Users provide policies
IDNP gatekeepers provide policy engine
IDNP provides replication and consistency control
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IDNP Issues
IAP
Call(Randy@Berkeley,
Caller’s network,
Interactive,
CallerID certificate)
IDNP
Server
Profile weeks/months
Replicated Information:
System
• Real-time?
State
• Lazy?
minutes/hours
• Epidemic?
Policy days/weeks
IDNP
Server
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Authentication and Billing
• Networks uses different mechanisms
– PSTN autheticates “on-line”
– GSM uses SIM card (Carrier-carrier agreement)
» Original cellular networks used personal agreements
– IP uses host address, X.509, etc.
• Iceberg certificates - two versions
– Online verification by home network (Carrier)
– Offline verification by local network (Personal/Visa)
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Call-Forwarding Example
• Called party can change policy and profiles
from any network
– Secure identification of entities
– IDNP handles propagation of changes
• IDNP can expose domain-specific addresses
or hide them for privacy
• Domain-specific information exposed to apps
– Interactive?
– Billing policies
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Presentation Outline
•
•
•
•
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Internet-Scale Systems
A New Service Architecture
Integration of Computing and Communications
Opportunity for Cooperation
Summary and Conclusion
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Berkeley Tradition of Experimental
Computing Systems Research
Evaluate
existing technology
to understand
its weaknesses
Time Travel
using today’s too
expensive technology
to prototype
tomorrow’s systems
Design
new computing
systems
architectures
Deploy
understand implementation
complexities and sources of
performance gain/loss
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Internet-Scale Systems Research Group
Lead the evolution of the Internet through long-term
research combined with the deployment of novel realworld large-scale systems and protocols
– Unify on-going and future research projects in distributed
computing, network protocols, services, access, new applications
– Facilitate technology transfer and standardization
– Work closely with industrial partners in an open laboratory
environment
We would like AT&T
to be a charter member
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Benefits of Sponsorship
• Involvement with outstanding Berkeley graduate
students
• Participation in large-scale, inter-disciplinary, precompetitive research efforts with only modest
investment, leveraging investment of other
industrial partners
• Access to all ISRG-developed software, prototypes,
simulation tools, and testbeds
• Early access to group’s research results through
on-campus participation and retreats
• Support the expansion of cadre of researchers with
expertise in Internet-scale systems
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Presentation Outline
•
•
•
•
•
Internet-Scale Systems
A New Service Architecture
Integration of Computing and Communications
Opportunity for Cooperation
Summary and Conclusion
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Emerging Distributed System
Architecture Spanning
Processing and Access
Personal Information Management and “Smart Spaces”
Distributed Videoconferencing
Room-scale Collaboration
Speech and Location
Aware Applications
ICEBERG
Computer-Telephony Services
MASH Media Processing Services
Active Services Architecture
TranSend Extensible
Proxy Services
Distributed Computing Services: NINJA
Computing and Communications Platform: Millennium/NOW
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NINJA and ICEBERG
• NINJA: Distributed Service Architecture
– Service model based on Operators, Paths, Services
– Platform model based on Units, Active Routers, Bases
• ICEBERG: Computer-Telephony Integration
– IP-based backbone for cellular networks
» Mobility and service interoperability in the context of
diverse access networks
» Performance issues: GPRS scheduling and IP scaling
for mobile telephony applications
» New services: Smart Spaces and PIM
• Internet Systems Research Group
– “Lucent establishes research wing at Stanford” !?!?!?
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