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Questions and Answers
What does CSMA/CA stand for in wireless communication?
What does CSMA/CA stand for in wireless communication?
- Collision Sensing Mobile Access with CD
- Carrier Sense Multiple Access with Collision Avoidance (correct)
- Contention Slot Multiple Access with Conflict Avoidance
- Controlled Spectrum Mobile Allocation with Collision Analysis
What is the purpose of the Distributed inter frame Space (DIFS) in CSMA/CA?
What is the purpose of the Distributed inter frame Space (DIFS) in CSMA/CA?
- To freeze the backoff counter during transmission
- To wait for the end of the current transmission (correct)
- To pick a random number of slots to transmit a frame
- To announce the beginning of the contention window
What happens if other Mobile Stations (MSs) transmit during the backoff time in CSMA/CA?
What happens if other Mobile Stations (MSs) transmit during the backoff time in CSMA/CA?
- The transmitting MS defers its transmission
- The receiving MS freezes its backoff counter (correct)
- The receiving MS immediately starts its transmission
- The transmitting MS increases its backoff counter
When can a Mobile Station (MS) start its transmission in CSMA/CA?
When can a Mobile Station (MS) start its transmission in CSMA/CA?
What does CSMA/CA allow terminals to do in case of channel contention?
What does CSMA/CA allow terminals to do in case of channel contention?
In CSMA/CA, why does a Mobile Station defer to another if it senses the medium is busy?
In CSMA/CA, why does a Mobile Station defer to another if it senses the medium is busy?
What is the main characteristic of p-persistent CSMA protocol?
What is the main characteristic of p-persistent CSMA protocol?
Which special case represents 1-persistent CSMA?
Which special case represents 1-persistent CSMA?
What is the tradeoff provided by p-persistent CSMA protocol?
What is the tradeoff provided by p-persistent CSMA protocol?
At which probability value does the persistent CSMA have to wait for T units before transmitting?
At which probability value does the persistent CSMA have to wait for T units before transmitting?
In terms of throughput, which type of CSMA has the highest efficiency?
In terms of throughput, which type of CSMA has the highest efficiency?
What happens if the medium is busy in p-persistent CSMA protocol?
What happens if the medium is busy in p-persistent CSMA protocol?
What is the main issue when more than one Mobile Station (MS) transmits at the same time on the control channel to BS?
What is the main issue when more than one Mobile Station (MS) transmits at the same time on the control channel to BS?
Which protocol resolves a collision after it occurs in a multiple access system?
Which protocol resolves a collision after it occurs in a multiple access system?
What type of protocols aim to solve multiple access issues in wireless communication systems?
What type of protocols aim to solve multiple access issues in wireless communication systems?
In a wireless system, what happens if more than one Mobile Station (MS) attempts to transmit data simultaneously?
In a wireless system, what happens if more than one Mobile Station (MS) attempts to transmit data simultaneously?
Which protocol is designed for Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) in wireless networks?
Which protocol is designed for Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) in wireless networks?
What is the primary issue when several Mobile Stations (MSs) share the same communication channel?
What is the primary issue when several Mobile Stations (MSs) share the same communication channel?
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Study Notes
CSMA/CA in Wireless Communication
- CSMA/CA stands for Carrier Sense Multiple Access with Collision Avoidance.
Distributed Inter Frame Space (DIFS) in CSMA/CA
- The purpose of DIFS is to provide a minimum waiting time for a station to sense the channel before transmitting.
Backoff Time in CSMA/CA
- If other Mobile Stations (MSs) transmit during the backoff time, the transmission will be delayed.
Transmission in CSMA/CA
- A Mobile Station (MS) can start its transmission when the channel is sensed idle for a DIFS period.
Channel Contention in CSMA/CA
- CSMA/CA allows terminals to defer transmission to avoid collisions in case of channel contention.
Channel Busy in CSMA/CA
- A Mobile Station defer to another if it senses the medium is busy to avoid collision.
p-Persistent CSMA Protocol
- The main characteristic of p-persistent CSMA protocol is that a station waits for a random time before transmitting.
- A special case of p-persistent CSMA represents 1-persistent CSMA.
- The tradeoff provided by p-persistent CSMA protocol is between throughput and delay.
Transmission in p-Persistent CSMA
- At a probability value of p, the persistent CSMA has to wait for T units before transmitting.
- If the medium is busy in p-persistent CSMA protocol, the transmission is delayed.
Throughput Efficiency in CSMA
- 1-Persistent CSMA has the highest efficiency in terms of throughput.
Multiple Access Issues
- The main issue when more than one Mobile Station (MS) transmits at the same time on the control channel to BS is collision.
- The primary issue when several Mobile Stations (MSs) share the same communication channel is multiple access.
Collision Resolution
- CSMA/CA is a protocol that resolves a collision after it occurs in a multiple access system.
Multiple Access Protocols
- Protocols that aim to solve multiple access issues in wireless communication systems are CSMA, TDMA, FDMA, and CDMA.
- MAC (Medium Access Control) protocols are designed to resolve multiple access issues in wireless communication systems.
- IEEE 802.11 is a protocol designed for Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) in wireless networks.
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