service encapsulation in iceberg bhaskaran raman iceberg, eecs, u.c.berkeley presentation at...
TRANSCRIPT
Service Encapsulation in ICEBERG
Bhaskaran RamanICEBERG, EECS, U.C.Berkeley
Presentation at Ericsson, Sweden, June 2001
The Case for Services
"Service and content providers play an increasing role in the value chain. The dominant part of the revenues moves from the
network operator to the content provider. It is expected that value-added data services and content provisioning will create
the main growth."
Subscriber user
Servicebroker
Servicemgt.
Accessnetworkoperator
Corenetworkoperator
Value addedservice
providers
Value addedservice
providers
Value addedservice
providers
Contentproviders
Contentproviders
Contentproviders
Access NetworksAccess Networks
Cellular systemsCellular systemsCordless (DECT)Cordless (DECT)
BluetoothBluetoothDECT dataDECT data
Wireless LANWireless LANWireless local loopWireless local loop
SatelliteSatelliteCableCable
DSLDSL
ICEBERG’s Goal: Potentially Any Network Service (PANS)
TextTexttoto
speechspeech
CellularPhone
Emailrepository
Devices Services
Extensibility is Important
• New device: should be able to access existing services
• New service: should accessible from existing devices
• Any-to-any capability:– Unique to ICEBERG– Existing commercial
products for service integration do not talk about this
ICEBERG: A Middleware Approach
• Middleware components: Naming service, APC, IAPs, Preference Registry
• Naming service: provides device/service name independence
• APC: device/service data type independence• IAPs: provide network independence• Preference Registry: for personalization of
incoming communication (for a end user)
Two kinds fo services
• Communication services (personal mobility)• Service end-points (service mobility)
Personal Mobility
• Person is the communication end-point, not the device
• Enabled through the preference registry (acts as a redirection agent)
• Example services built:– Redirection– Filtering– Service handoff
Preference Registry GUI
Preference Registry GUI
Service Mobility: Devices and Services in ICEBERG
• Devices– GSM cellular phones– Desktop phones (VAT)
• Using GSM audio• Using PCM audio
– PSTN phones
• Services– MediaManager (for
access to email)– MP3 Jukebox (from
Ninja)– Instant messaging (from
Ninja)– Voice-mail service
PANS and Extensibility
• All services accessible from all devices• All devices can communicate with one another• Extensibility: services and devices were added
incrementally, not all at once
Illustrating Extensibility
Instant Messaging Service
674
PCM-ULAW Sun au Text
GSM PCM-ULAW Sun au Text
Illustrating Extensibility
529
PCM-ULAW PCM-UB MP3
GSM PCM-ULAW PCM-UB MP3
Jukebox Service
Adding a new device/service end-point
• Add an IAP• Add entries to the
Naming Service• Add operators
(transformation agents) to the APC service
IAP
IAP
IAP
IAP
IP-Addrs
Tel. No:s
Email-addrsPager no:s
Adding a service end-point: Example
• Jukebox service– IAP: interface to the Ninja Jukebox service
• 800 lines of Java code
– Adding naming entries for the Jukebox service: trivial– Operators added:
• MP3 PCM-UB (mpg123)• PCM-UB PCM-ULAW (sox)
Adding a device end-point: Example
• PSTN phones– Interface through a H.323 gateway– Device specific part of IAP: 15,000 lines– ICEBERG specific part of IAP: 900 lines– Adding naming entries: simple– Operators added:
• PCM-UB PCM-SW (sox)• PCM-SW G.723 (lbccodec)• G.723 PCM-SW (lbccodec)
Adding new IAPs
• Device specific part may be very complex– H.323 gateway, GSM cellular-phones
• ICEBERG specific part is quite simple – a few days of coding
• Importantly, once the IAP is implemented and deployed, it can be used for all services
Adding new operators
• Operator itself could be very complex– G.723 codec, GSM codec, Text-to-speech
• But, once they have been implemented and deployed, they can be reused for multiple purposes– E.g., the MP3 PCM-UB operator
Future Directions
• Service composition in the Wide-Area• Examples:
– Email to voice– Video-on-demand over PDA– Ad insertion in video stream– Others: storage, redirection…
• Independent service providers deploy services: portal providers compose them
• Issues:– Performance sensitive choice of service instances– Fault-tolerant maintenance of session when service
instances fail
Conclusions
• ICEBERG: Middleware approach to enabling services
• Extensible PANS through– Network independence (IAP)– Name independence (Distributed naming service)– Data type independence (APC)
• Implementation of several device and service end-points in our testbed has shown the flexibility of our architecture
• See the demo in the afternoon!