1. Personal Communication Services & WiFi
Olga Nash

2. Personal Communication Services (PCS)
Radio communications that encompass mobile and ancillary fixed communication that provides services to individuals and businesses and can be integrated with a variety of competing networks. (FCC)
Basically, a set of digital capabilities that allows some combination of personal mobility and service management.

3. PCS Types
Unlicensed PCS
Narrowband PCS
Broadband PCS

4. Unlicensed PCS
The FCC allocated 20 MHz of spectrum between 1,910 and 1,930 MHz to use by unlicensed, low-power devices.
Accommodates short-range communication
May not cause harmful interference
Must accept any interference

5. Unlicensed PCS Person-to-person communication
Fixed wireless communications
Monitoring and identification
Sensation, detection and imaging
Remote control

6. Narrowband PCS Band Channels Channel Size 901-902 MHz 930-931 MHz32
12.5 kHz – 150 kHz

7. Narrowband PCS Two-way paging Confirmed message delivery
Wireless telemetry
Locator service

8. Broadband PCS Band Blocks Block Sizes 1,850-1,910 MHz 1,930-1,990 MHz
A-F, C1-C5
10-30 MHz

9. Broadband PCS Voice capabilities Advanced two-way data capabilities
Digital mobile phones
Wireless Internet access

10. Digital vs. Analog Higher quality Higher efficiency Encryption
Ability to support next-generation devices

11. WiFi
“Wireless Fidelity”
Wireless Local Area Network (LAN)
802.11

12. WiFi
Wireless network that provides high-speed wireless data access in limited geographic areas.
Uses technology in the 2.4 and 5 GHz radio bands
Range of services – up to 1,000 feet
Speed – up to 11 Mbps

13. WiFi Speed Number of users Distance from access point Obstructions
Speed of wired line that connects the access point to the network
Other equipment used

14. Wireless Network Topology
Ad-hoc Mode
Infrastructure Mode

15. Ad-hoc Network
Data in the network is transferred to and from wireless network adapters connected to PCs.
Easy to set up
Inexpensive
Fast

16. Ad-hoc Network

17. Infrastructure Network
Contains one or more access points connected directly to an existing network
Extended range
Roaming ability
Slower data transfer rate
More expensive

18. Infrastructure Network

19. Benefits of WiFi
Mobility
Speed
Cost-effectiveness
Reliability

20. WiMax A extension and future of WiFi 802.16 technology
Speed – up to 70 Mbps
Range of services – up to 30 miles
Estimated 4 million users by 2008

21. Questions?
Thank you.