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RF and Spread Spectrum Functionality
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CSMA/CA Operations
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Ethernet networks (IEEE 8023) use a form of collision management known as collision detection (CD) Wireless networks use a different form of collision management known as collision avoidance (CA) The full name of the physical media access management used in wireless networks is carrier sense multiple access/ collision avoidance, or CSMA/CA The essence of CSMA/CA is that collisions can happen in many places on the medium, at any time during a transmission, and likely cannot be detected by the transmitter at its location Listening for evidence of a collision while transmitting is not possible and, therefore, not a part of the protocol Transmissions cannot be aborted early Collisions are only one possible explanation for failure to receive an immediate acknowledgment after transmitting a frame in its entirety Since the cause of the failure and the exact point in the frame where the failure occurred cannot be known, the frame must be retransmitted completely Under these circumstances there is much value in collision avoidance and there is much of it in the IEEE 80211 protocols If you ve ever had a conversation with another person on the telephone, you ve probably experienced a communications collision When you both started speaking at the same time, neither of you could hear the other effectively Usually, you will both stop speaking for some amount of time and then one of you will start speaking again Since the time that both of you choose to wait is slightly different, there is a good chance that one of you will be able to communicate the next time This would be similar to collision detection The carrier sense in CSMA means that the devices will attempt to sense whether the physical medium is available before communicating The multiple access indicates that multiple devices will be accessing the physical medium In a CD implementation of CSMA, when a collision is detected, both devices go silent for a pseudo-random period of time Since the time period is different for each device, they are not likely to try communicating at the same time again This process helps to recover from collisions and to avoid another collision In a CSMA/CD implementation, collisions occur because devices can begin communicating at the same time even though they both listened for silence on the physical medium There was indeed silence, but both devices broke the silence at the same moment CSMA/CA is used in wireless networks, and it was also used in early Apple LocalTalk networks, which were wired networks that were common to Apple devices Collision avoidance is achieved by signaling to the other devices that one device is about to communicate This would be like saying, Listen, for the next few
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minutes, because I will be talking in a telephone conversation You are avoiding the collision by announcing that you are going to be communicating for some time interval CSMA/CA is not perfect due to hidden node problems, which will be covered in 7, but it provides a more efficient usage of a medium like RF than would CSMA/CD
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With the knowledge provided in this chapter, you are beginning your preparation to plan and implement real-world wireless networks Understanding the channel structure of the various wireless technologies and colocation issues allows you to provide the needed coverage in areas both large and small Knowing the different ranges of communications you can expect from 80211a and 80211b/g devices helps you determine the right technology for the right situation The independent basic service set, or IBSS, provides an exceptional solution for small dynamic networks where centralized administration is not required An infrastructure basic service set, or BSS, allows for centralized administration and greater control over who can access your network Extended service sets, also known as ESSs, give you the ability to allow roaming on your network without the loss of network connection as long as client hand-off is handled effectively Finally, understanding the difference between active mode and power save mode for power management allows you to make the right decision when it comes to battery-powered devices on your network Remember that power save mode reduces throughput, but active mode reduces battery life When you know which of these two is more important, you ll be able to make the right choice in any situation
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