Questions tagged [communication-protocols]

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How to ensure connectedness in a masterless gossip protocol?

This is a theoretical question about how gossip protocols work; I am not asking about any specific implementation or piece of software. I've read the wikipedia page https://en.wikipedia.org/wiki/...
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4k views

Merits and demerits of convolutional and linear block codes

Continuing on from my previous post... Both convolution and linear block codes can be used for error correction. The main benefits I gathered from using convolutional codes is that, it's easy to ...
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5k views

totally ordered multicast with Lamport timestamp

I'm studying Distributed Systems and synchronization and I didn't catch this solution of totally ordered multicast with Lamport timestamps. I read that it doesn't need ack to deliver a message to the ...
2
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1answer
100 views

'Half-Close' figure of Data Communications and Networking, 5/e

In the Figure 24.13 of Data Communications and Networking, 5/e the first ACK message from the server holds y-1 in it's Sequence no. field. Note that the first FIN ...
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0answers
31 views

Sending infinite frames in One-Bit Sliding WIndow Protocol?

I am reading Computer Networks by Andrew S. Tanenbaum and I wonder if there is a mistake in the protocol as I can't find any solution for the following scenario. Suppose the transmitter (A) has only ...
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0answers
54 views

Authority section in DNS packet always contains NS records?

I'm new to DNS and I'm trying to understand the DNS packet format. From what I understand, the authority section of a DNS packet gives information about servers that are authoritative for the domain ...
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24 views

Auxiliary random variables in the analysis of the private information of wiretap channels

I am following Section 13.2 of Mark Wilde's book. I reproduce the question here for completeness. Consider a wiretap channel $X\rightarrow Y,Z$ defined by the conditional probabilities $p(y,z|x)$ for ...
1
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1answer
87 views

Where were the ideas of vote, accept and commit phases originally introduced?

In the Stellar Consensus Protocol SCP, the voting procedure follows a 3 phase commit i.e. vote, accept and confirm i.e. see section 5. Is this a novel introduction or has this been previously been ...
1
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1answer
134 views

Finding maximal and average number of time slots in an Adaptive tree walk protocol

Tried to research here and on other sites with no luck regarding finding the maximal and average number of time slots in an Adaptive tree walk protocol. i'll explain what i mean here: In a simple(...
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21 views

Why Not To Take B8ZS with encoding 7 digit?

I have a simple question. In signal encoding we have B8ZS (Bipolar with 8 zeros substitutions) technique which encodes every 8 sequencial 0 bits with 000+-0-+ or 000-+0-+ depends on previous voltage ...
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134 views

Training preamble in convolutional codes

as I was examining the VirtualWire library used in Arduino projects, I noticed that the header of the messages that are transmitted begin with a 36 bit "training preamble." What exactly is a training ...
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62 views

Why is Game Theory used to explain implementations of 3GPP D2D communication?

My question is about D2D as it relates to 3GPP (release 13+, I believe). All I have read on the subject uses Game Theory as a mechanism to explain usage. Why would authors use Game Theory for ...
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44 views

Stop and Wait protocol in a half duplex scheme

glad i found this site. would appreciate help with this: in picture i uploaded there's a state diagram of a "stop and wait" protocol in a half duplex channel. we assume current status is (10A). ...
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91 views

Are acknowledgements used in CSMA/CD?

To provide context, I have read that CSMA/CD does not rely on acknowledgements and relies on collision signals to check for successful or unsuccessful transmissions (from what was explained in the ...
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17 views

Go Back N question(netwrok)

Hello I am trying to understand the GBN protocol and I encountered the following question during my homework. Assume that we have GBN protocol with a window size of 20. The sender sends 15 packets ...
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117 views

utilization of bitmap protocol

I am curious about utilization calculation in the bitmap protocol. especially if there's a difference between if only station 0 wants to broadcast(and the others doesn't) or only some other station ...
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25 views

Affects of altering a line in “stop and wait” protocol(no noises)

what will happen if we change "to_physical_layer(&s)" to "to_physical_layer(&r)" in the following code(marked in the code where)? does it make the protocol fail? if so, show a scenario it ...
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133 views

Probability in Dynamic frame aloha

If I've RFID Collision Arbitration System that is based on multi-frame dynamic frame ALOHA. How can compute the probability of the average tag resolution $L_n$? ,$P_s$ is probability for packet ...
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70 views

Picking an optimal initial congestion window size (high bw, high latency and short bursts)?

What is a known strategy to approach a situation where short bursts of data are being sent very often over a high bandwidth, high latency cable? I am aware of cubic but even that does not utilize a ...