Why is slotted Aloha more efficient?

What is slotted Aloha and Aloha difference?

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What are the disadvantages of slotted Aloha?

Is it worth to give it a try?

I'm talking about an ALOHA protocol running in 802.11b mode. Does it bring any advantage over other slotted Aloha protocol? Is it easy to implement? I'd rather not try to change anything in the code, it has been already tested and it works well.

The downside of slotted Aloha is that when there are two or more simultaneous transmissions on the channel, both are rejected. However, if you have a long preamble, this may be acceptable. Another downside of slotted Aloha is that the ACKs are delayed until the STA is out of its CCA process; this means that CTSs can't always be correctly transmitted. (You can either try to make CCA re-take earlier, or add some random time delay at the end of each packet for the STA to start sending ACKs, like my first article shows).

Of course, there are other disadvantages: slotted Aloha is not a very well-studied protocol. The 802.11ac and 802.11ad draft documents are still missing important details; the specification currently only includes a lot of "should do so" statements. (But don't worry - when ACKs are delayed, you can just drop all ACKs in the case of one or more successful CTSs).

The biggest problem with slotted Aloha is that people usually don't want to add too much randomization and/or complexity to their code. So, I think we should make all the code in my second article work without any modification and only focus on finding a good solution for the preamble. Otherwise, most of us would have to spend a lot of time reinventing the wheel.

(In my articles, I use the term "random" to mean "in a way that's independent of the STA's specific HW and its configuration". Random isn't necessarily completely unpredictable; random is a subset of unpredictable and pseudorandom is a subset of random.)

Slotted Aloha doesn't really seem to gain anything in the case of only two simultaneous transmissions, in which case the contention window size is automatically adjusted (as explained in my first article). I've simulated that and found it's similar to the other protocols (and as simple to implement as it gets): That's about it.

What is the formula for G for slotted Aloha?

I have been asked a number of times in this forum, "?

". The reason I ask is that I know that the "Aloha" protocol has to do with what to do when there are collisions. A good explanation of how it works can be found at For slotted Aloha, you only have a 1/N chance of collision. You do this by defining G so that you can calculate the probability of collision and then using that probability to decide how to handle a collision.

In the case of Aloha, G is defined as follows: G=0. To get a better idea of how G works, here is a simple simulation that simulates a system with 10 nodes that transmits once every 100 milliseconds (10 ms time slot). We assume that the nodes are placed randomly on the graph with distance between nodes varying between 0 and 2. We then count the number of collisions that occur over a given time and use that number to calculate the probability of a collision using the above formula. We show the results of this simulation in the following figure. In this figure we have plotted the probability of collision for various values of G and the corresponding value of N. The curves for both cases of odd and even values of N, show the same pattern, which is that the probability of collision approaches a finite limit as G approaches zero. The curves for even values of N converge to a single value and the curves for odd values of N converge to different values. In other words, G=0.5 for even values of N converges to a single value, whereas for odd values of N it converges to a different value.

Why is that? The answer is that for odd values of N, the probability of collision approaches zero as G approaches zero, but for even values of N, the probability of collision approaches a constant. In other words, the probability of collision for odd values of N approaches a constant, but for even values of N, it approaches zero.

Why is slotted Aloha more efficient?

What are the main differences between the Slotted Aloha and Unslotted Aloha protocols? In this post I'll explain how to calculate the efficiency of a slotted Aloha protocol in order to answer that question. Slotted Aloha vs Unslotted Aloha: What's the difference? Both Slotted Aloha and Unslotted Aloha protocols use CSMA/CD (Carrier Sense Multiple Access with Collision Detection). They differ however in what is meant by "aloha" in the name, ie the following: Unslotted Aloha: "Unslotted Aloha" means that every node must transmit before it can receive. The main advantage of unslotted Aloha is that it avoids collisions and thus is very efficient. The downside however is that it can potentially create hidden nodes.

Slotted Aloha: "Slotted Aloha" means that every node transmits on the same time slot as the previous node. This means that when all nodes transmit on the same time slot they avoid collisions and therefore has fewer hidden nodes than the Unslotted Aloha protocol. The downside of the Slotted Aloha protocol is that it requires more time slots, ie more bandwidth, to send messages. This means it is less efficient.

For a long time it was not clear why we would want to use slotted Aloha, but as of late we've seen a lot more interest in it, eg in Ad-hoc networking. I'm not an expert on Aloha protocol. I've only worked with it, if you want to know more about how it works, I suggest you read some of the literature (Google for "Aloha") Calculating efficiency: In order to compare the two protocols we need to determine the number of transmission slots needed to send the same number of messages as a Slotted Aloha protocol. This means we need to find the maximum number of times a node can transmit per time slot for a given amount of bandwidth (measured in bits/second). If the bandwidth is fixed, then the number of transmission slots is constant. If the bandwidth is varying, then the number of transmission slots must be determined for each transmission slot. The total number of transmission slots will be the sum of all the transmissions.