Exam 17: Wireless Lans

A primary multiple access scheme used in cellular telephony is __________.

As mobile units move,they pass from cell to cell,which requires transferring of the call from one base transceiver to another; this process is called a __________ .

Each mobile telecommunications switch office is connected to one base station and provides a management interface between that base station and the rest of the network.

The specific base station that communicates with the mobile unit is selected by the MTSO based on the strength of the signal received from the mobile unit.

Which of the following is NOT one of the ways that frequency spectrum can be divided among active users?

For a given system,multiple access is based on _______.

In contrast to earlier generations,4G systems do not support traditional circuit-switched telephony service.

When using wireless networks,there are limitations on which frequencies can be used for the channels.

Prior to cellular radio,mobile radio and telephone services required:

When a mobile unit moves,it may connect with a different base station.This action is called ____________.

With ____________,a cell is divided into a number of wedge shaped sectors,each with its own set of channels,typically three or six sectors per cell.

First generation mobile telephone systems used analog voice communication based on amplitude modulation.

The ideal design for cells in a cellular network is a hexagonal shape because _____.

4G networks,devices,and services are expected to evolve slowly over the next decade.

___________ have the following characteristics: • Circular orbit at an altitude in the range of 5000-12,000 km. • The orbit period is about 6 hours. • The diameter of coverage is from 10,000 to 15,000 km. • Round-trip signal propagation delay is less than 50 ms. • The maximum time that the satellite is visible from a fixed point on earth (above the radio horizon)is a few hours.

When using cellular networks,__________.

Peak download rate for a 4G network is __________.

Peak download rate for a 3G network is _________.

The most common type of communications satellite today is the _________,first proposed by the science-fiction author Arthur C.Clarke in 1945.

The base station selected for communication with a mobile unit is always the one closest to the current location of the unit.