Frequency Division Multiple Access (FDMA)

<p>To prevent interference and ensure efficient communication</p> Signup and view all the answers

<p>Between 890.2 and 915 MHz</p> Signup and view all the answers

<p>It is used for simultaneous access to the medium by base station and mobile station</p> Signup and view all the answers

<p>It allocates certain time slots for communication</p> Signup and view all the answers

<p>Allocating fixed bandwidth and using a fixed pattern for time slots</p> Signup and view all the answers

<p>Time division duplex (TDD)</p> Signup and view all the answers

<p>No coordination among the users, with no collision detection and no central arbiter</p> Signup and view all the answers

<p>Introduction of time slots for synchronized transmissions</p> Signup and view all the answers

<p>Stations sense the carrier and start sending immediately if the medium is idle</p> Signup and view all the answers

<p>Sensing the medium and transmitting with a probability p</p> Signup and view all the answers

<p>Assigning an optimal base station to a mobile phone user based on different quality</p> Signup and view all the answers

<p>Data retransmission is not supported after collision</p> Signup and view all the answers

<p>Space division multiple access (SDMA)</p> Signup and view all the answers

<p>To allow for simultaneous transmission in both directions by using different frequencies for uplink and downlink.</p> Signup and view all the answers

<p>Allocating frequencies to transmission channels according to frequency division multiplexing (FDM).</p> Signup and view all the answers

<p>Uplink frequencies are from mobile station to base station, and downlink frequencies are from base station to mobile station.</p> Signup and view all the answers

<p>Space Division Multiple Access (SDMA).</p> Signup and view all the answers

<p>Simultaneous access to the medium by base station and mobile station.</p> Signup and view all the answers

<p>It allows for establishing a duplex channel, i.e., a channel that allows for simultaneous transmission in both directions.</p> Signup and view all the answers

<p>Fixed TDM results in a fixed bandwidth, while TDMA offers a much more flexible scheme by allocating certain time slots for communication.</p> Signup and view all the answers

<p>Time division duplex (TDD)</p> Signup and view all the answers

<p>No coordination among the users and lack of collision detection in Classical Aloha, leading to a lot of collisions.</p> Signup and view all the answers

<p>FDMA involves allocating different frequency bands to multiple users for simultaneous communication.</p> Signup and view all the answers

<p>SDMA (space division multiple access)</p> Signup and view all the answers

<p>Lack of coordination among users and no collision detection</p> Signup and view all the answers

<p>Stations sense the carrier and start sending immediately if the medium is idle, or pause a random amount of time before sensing the medium again if it is busy.</p> Signup and view all the answers

<p>FDD allows simultaneous transmission and reception on different frequencies, enabling full-duplex communication.</p> Signup and view all the answers

<p>Slotted Aloha introduces time slots and synchronized transmissions, reducing collisions compared to the lack of coordination and collision detection in Classical Aloha.</p> Signup and view all the answers

<p>TDMA allocates certain time slots for communication, achieving synchronization between sender and receiver in the time domain.</p> Signup and view all the answers