17-09-2012, 12:21 PM
Wireless Local Loop
[attachment=33835]
Introduction
•Wireless Local Loop (WLL)
–Two-way wireless communication services to stationary or near-stationary users in a small area
•Local Loop
–The circuit connecting a subscribers’stelephone with line-terminating equipment at a Central Office.
–These circuits are separated into “drops” for individual subscribers
WLL vs. WirelineSystem
•Advantages of WLL over Wire Line Loop
–Concentration of Resources
–Flexibility to planning and deployment of the system
–Fast network deployment and change
–Lower maintenance and capital costs
–Local mobile feature
–Temporary Installation
•Fixed-to-fixed propagation path
•Antennas are usually located at high spots
•Using directional antennas on both ends
•Design of WLL is simpler than that of mobile system
Wireless Local Loop Technologies
•Satellite-Based Systems
–Provide Telephony services for rural communities and isolated areas
•Cellular-Based Systems
–Provide high-power, wide-range, median subscriber density and median circuit-quality WLL services
–Offers both mobility and fixed wireless access via the same platform as cellular
•Low-tier PCS or Microcellular-Based Systems
–Provide low-power, narrow-range, high subscriber density and high circuit-quality WLL services
[attachment=33835]
Introduction
•Wireless Local Loop (WLL)
–Two-way wireless communication services to stationary or near-stationary users in a small area
•Local Loop
–The circuit connecting a subscribers’stelephone with line-terminating equipment at a Central Office.
–These circuits are separated into “drops” for individual subscribers
WLL vs. WirelineSystem
•Advantages of WLL over Wire Line Loop
–Concentration of Resources
–Flexibility to planning and deployment of the system
–Fast network deployment and change
–Lower maintenance and capital costs
–Local mobile feature
–Temporary Installation
•Fixed-to-fixed propagation path
•Antennas are usually located at high spots
•Using directional antennas on both ends
•Design of WLL is simpler than that of mobile system
Wireless Local Loop Technologies
•Satellite-Based Systems
–Provide Telephony services for rural communities and isolated areas
•Cellular-Based Systems
–Provide high-power, wide-range, median subscriber density and median circuit-quality WLL services
–Offers both mobility and fixed wireless access via the same platform as cellular
•Low-tier PCS or Microcellular-Based Systems
–Provide low-power, narrow-range, high subscriber density and high circuit-quality WLL services