Sol14 - CHAPTER 14 Wireless LANs Solutions to Review...

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1 CHAPTER 14 Wireless LANs Solutions to Review Questions and Exercises Review Questions 1. The basic service set (BSS) is the building block of a wireless LAN. A BSS with- out an AP is called an ad hoc architecture; a BSS with an AP is sometimes referred to as an infrastructure network. An extended service set (ESS) is made up of two or more BSSs with APs. In this case, the BSSs are connected through a distribution system, which is usually a wired LAN. 2. A station with no-transition mobility is either stationary or moving only inside a BSS. A station with BSS-transition mobility can move from one BSS to anther, but the movement is confined inside one ESS. A station with ESS-transition mobility can move from one ESS to another. 3. The orthogonal frequency-division multiplexing (OFDM) method for signal gen- eration in a 5-GHz ISM band is similar to frequency division multiplexing (FDM) , with one major difference: All the subbands are used by one source at a given time. Sources contend with one another at the data link layer for access.
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