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I have a few questions regarding slotted-ALOHA. …

Even in pure aloha, I understand how is vulnerable time 2*Tt time is derived. Here Tt is transmission time. … My doubt is why don't we add or consider Tp time in pure aloha and Tt time in CSMA/CD when calculating vulnerable time. Why are we ignoring it ? …

Tp is same as Tt for pure aloha Tfr is also same as Tt …

My question is- Why that is not true in the case of Aloha ?. Why we do not have the same vulnerable time in Aloha? That question has already been asked but no responses.- Vulnerable Time in ALOHA …

This is the very obvious question in the case of slotted aloha but the only reason to use slotted is the efficiency which in case pure aloha is very low. … Vulnerable time in the case of pure aloha is 2*T (where T is transmission delay) where in the case of slotted aloha it is reduced to T so we can see only this advantage in the case of slotted aloha. …

So the way I understand it, if station A and station B, for example, try to transmit a frame at the same slot, a collision occurs, leading to an attempt at the next slot. But wouldn't the algorithm ju …

The time required to send a frame is called frame time. Vulnerable time is the time during which no transmission should be done to avoid any collision. My question is what kind of problem will be c …

This is because in pure ALOHA, even if a bit of a frame collides with a bit of another frame, both the frames get discarded. … Also, in pure ALOHA, a station doesn't listen to the medium before transmitting. So, it has no way of knowing that another frame was already underway. …

Consider a MAC protocol (ALOHA, CSMA, TDMA, etc.) that, even for very high loads, always results in a throughput of 1 (normalized with respect to the channel speed). …

Suppose you have a modified version of ALOHA where one priority user has transmission probability set to 1 and all others to 0. …

As you study more, will find that all the Aloha protocol variants are highly inefficient and ambiguous. … Let’s look at the (only) two tenets of the Pure Aloha protocol from UOH, 1971: If any device has data to send, send it If a collision occurs, scrap and try again later Slotted Aloha is just an extension …

In aloha vulnerable time is twice frame time. To see why this is, suppose you transmit the msg bit in 10sec(FT) to the receiver. …

Slotted Aloha). There are $N$ nodes each transmitting in a given slot with probability $p$. I understand that the probability a node is successful in a slot is $p(1 - p)^{N-1}$. …

The stations participating in aloha don't need to transmit frame starting at the initial time t=0. …

The maximum delay $D$ is a variable which should be tuned to maximise network throughput (akin to ALOHA). Problem: I'm trying to derive an expression for the network throughput. … I can't find any material on ALOHA with periodic transmissions, and can only find material where the probability of transmitting is poisson, and where each transmission is independent of the last. …