Consider the following Aloha systems. (a) A group of N users share a 56 kbps pure Aloha channel. Each user generates at a Poisson rate of one 1000-bit packet every 100 sec, even if the previous one has not yet been sent. What is the maximum value of N (Hint: The pure Aloha maximum channel utilization is 18.4%)? (b) Ten thousand airline reservation stations are competing for the use of a single slotted Aloha channel. The average station makes 18 requests/hour. A slot is 125 μsec. What is the approximate total channel load (requests per slot)?
Consider the following Aloha systems. (a) A group of N users share a 56 kbps pure Aloha channel. Each user generates at a Poisson rate of one 1000-bit packet every 100 sec, even if the previous one has not yet been sent. What is the maximum value of N (Hint: The pure Aloha maximum channel utilization is 18.4%)? (b) Ten thousand airline reservation stations are competing for the use of a single slotted Aloha channel. The average station makes 18 requests/hour. A slot is 125 μsec. What is the approximate total channel load (requests per slot)?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Consider the following Aloha systems.
(a) A group of N users share a 56 kbps pure Aloha channel. Each user generates at a Poisson rate
of one 1000-bit packet every 100 sec, even if the previous one has not yet been sent. What is the
maximum value of N (Hint: The pure Aloha maximum channel utilization is 18.4%)?
(b) Ten thousand airline reservation stations are competing for the use of a single slotted Aloha
channel. The average station makes 18 requests/hour. A slot is 125 μsec. What is the approximate
total channel load (requests per slot)?
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