29-10-2010, 05:23 PM
[attachment=7041]
An Overview of Wireless Data Communications
Wide Area Cellular Services
Wireless LANs
Satellite
Integrated Wireless Services
The Cellular Principle
Relies on the concept of concurrency
delivered through channel reuse i.e. reusing channels in different cells
Total coverage area is divided into cells
only a subset of channels available in each cell
All channels partitioned into sets
sets assigned to cells
Rule: assign the same set to two cells that are sufficient geographically distant so that interference is small
Net result: increased capacity!
An Overview of Wireless Data Communications
Wide Area Cellular Services
Wireless LANs
Satellite
Integrated Wireless Services
The Cellular Principle
Relies on the concept of concurrency
delivered through channel reuse i.e. reusing channels in different cells
Total coverage area is divided into cells
only a subset of channels available in each cell
All channels partitioned into sets
sets assigned to cells
Rule: assign the same set to two cells that are sufficient geographically distant so that interference is small
Net result: increased capacity!
