Table of Contents
Background
Defined
- Service
- “Contribution to the welfare of others”, Merriam-Webster
- intent to ease someone' life/task/duties
- Act of helpful activity - public / military / civil service
- Wireless
- Having no wire / wires
- Operated by or actuated by electromagnetic waves
- Relating to radiotelegraphy / radio telephony / radio
- Wireless service
- Service utilising wireless communication technology
Background
- Compactness / shrinking of computing devices
- But with more powerful CPUs
- Efficiencies of memory, storage & battery
- Proliferation of mobile devices
- Most people in developed countries have a mobile phone(s)
- 1.15B phones sold in 2007, 1.28B in 2008 (Gartner market research)
- Emergence of new wireless comm technos
- Built into new devices
- Inter-connected future?
- Paradigm challenges
- P2P. Ad-hoc, Client-Server
- Local communication increasingly popular
Layers on service use
- Different types of users
- Different knowledge / background / interest
- Several access devices
- Different capabilities
- Numerous comm technologies & protocols
- Different challenges
- Multiple types of services
Layers on service use ...
Devices
- Desktops
- Laptops, notebooks, netbooks
- Tablets, touchpads, ipads
- PDA's
- Mobile phones (dumb / smart phones)
- Small widgets / gadgets
RF comm technos
- PAN technos (IEEE 802.15x)
- Bluetooth
- ZigBee
- UWB (> 500 MHz)
- Wireless USB
- Bluetooth
- LAN technos
- Wi-Fi (IEEE 802.11x)
- HiperLAN (ETSI)
RF comm technos ...
- Cellular technos
- GSM, GPRS, EDGE, UMTS
- Touch Zone
- RFID
- NFC
- Others
- Zensys
- WiMAX
- Many smaller ones (sensor nodes)
Non RF comm technos
- Optical
- Infrared (IR) - IrDA, Remote controllers
- Laser
- LED based
- Visible light
- Accoustic technos
- Ultra sonic transmitter & receivers
Protocols & protocol stacks
- TCP/IP
- WAP
- OBEX
- VOIP
- Web services (SOAP, WSDL, …)
- SyncML
- Comm techno specific protocols
- propriety protocols
Manners of service use
- Fixed use
- Access device is in a fixed location
- Nomadic use
- User wanders from location A to B
- Stops at location B to access service
- Mobile use
- Service consumed while the accessing device is moving
General service use
- Service discovery
- Service access / initiation
- By user or service provider
- Authentication
- Service &/or user authentication
- Authorisation
- Service consumption
- Accounting & charging / billing
- Order of event may vary
- E.g. pay before use (pre-paid) / pay after use
Service discovery
- 2 approaches
- Find specific service
- Where is a certain service?
- E.g. where is a printer
- Find available services
- What services are offered to me?
- What services exist around here?
Service discovery in the Internet
- IP address & dedicated port, URL
- Service location protocol (SLP), IETF
- UDDI (web services)
- Google
Wireless service discovery
- 2 common phases
- Device discovery
- What devices exist within my comm range
- Service discovery
- What services the found devices offer?
- Does any of found devices offer the service am looking for?
Service access
Service access ...
- a - Access from desktop PC to Internet service
- b - Access to Internet service from wireless device
- c - Access to local service from wireless device
- d - Access of telecom service from mobile phone
- e - P2P access between 2 mobile devices
- (a, b, c, d, e) service pushed to customer
AAA
- Authentication
- Establish/confirm a claim
- Device authentication
- User authentication
- Authorisation
- What is the device/user permitted to do
- Accounting
- What this device/user has done?
- How much to we charge/bill from it?
Service categorisation
- Different ways to categorise services:
- Access methonds (P2P, telcom, Ad-hoc, ..)
- How it looks to the user (transparent, interactive, …)
- How the data delivery works (push/pull - user/service initiated)
- What service ehancing techno is it based on
- E.g. Location based, personalised, proximity, …
- What type of service is provided
- E.g. Security, information, payment, …
Standardisation & definitions
- Radio
- IEEE
- ETSI
- Apps
- OMA
- Open upper layer standards for mobile phone industry
- Bluetooth SIG
- ZigBee Alliance
- Location Interoperability forum - (OMA consolidatee)
- Mobile wireless Internet forum (MWIF)
- Many more dedicated to specific aspects
Considerations
- What kind of service do we want to provide?
- To what environment do we provide the services?
- What comm techno can we use?
- To whom
- What type/kind access device do they have
- Can we force them to use an access device we want?
- Should we adapt the service for different device types?
- How can we help the service use
Considerations ...
- Provide neccessary funtionalities just in server side?
- Service accessible via standard apps on device (browser)
- Else, how to provided needed apps to customers
- How about P2P paradigms
- What do we gain in service provision?
- Profits through increased sales?
- Payed service - charging/billing of service consumption
- Additional value for company
Next lecture
- Wireless devices
- Properties, OS, …
- Development issues on devices
- TODO
- Different categories of wireless services
- Manners of service use
