ECE 543 COMMUNICATION NETWORKS I Problem Set 2 Solution
2.17 a) T=Tt+Tf+2Td b) q=(1-pt)(1-pf) The expected number of transmissions of a given packet is Ecfw_transmissions per packet=
iq(1 q)
i =1
i 1
=
1 q
c) Ecfw_time per packet=T/q=1.3/0.998=1.303
2.21
ECE 543
Homework 1 Solution
1.
a) A circuit-switched network would be well suited to the application, because the
application involves long sessions with predictable smooth bandwidth
requirements. Since the transmission rate is known and not bursty, bandw
ECE 543
Communication Networks I
Homework 1
1. Consider an application that transmits data at a steady rate (for example, the
sender generates an N-bit unit of data every k time units, where k is small and
fixed). Also, when such an application starts, it
Homework 2
1- A professor practices the following strategy with respect to accepting to advise new Ph.D. students. On the
even-numbered years, she accepts 2 new students. On the odd-numbered years, she accepts 1 new student.
Assuming the average time to g
ECE358: Computer Networks
Fall 2014
Solutions to Homework #1
R 11.
Suppose there is exactly one packet switch between a sending host and a receiving host. The
transmission rates between the sending host and the switch and between the switch and the receiv
Piazza Time
I have a quick question about how to understand M/M/c/c queues.
You have an example where you find the probability that a call is
blocked in a system when there are 50 channels available. You then
find P(50) = 40^50 / 50! / sum(k=0 to 50): 40^
Chapter 6
Wireless and
Mobile
Networks
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Chapter 5
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Chapter 5
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16:332:543: Communication Networks I
Delay Models
Summary slide set #3
1
From Discrete Time to Continuous Time
3-2
One step Transition probability in DTMC
t
To avoid setting the time window use calculus
3-3
Using Chapman Kolmogorov:
Continuous Time Markov
Communication Networks I Homework Set 1 Solutions
Outdated items in the text: (collected from your submissions) ISDN is the future for integrated voice/video and realtime data. Nowadays these go over the IP network. Optical fiber will be implemented in th
ECE 543 Communication Networks I Problem Set 5 Solution (The solution for 3.12 is a bonus item.)
The value of pm can be calculated using the matlab functions from the probability text as poissonpmf(a,m)/poissoncdf(a,m) where a = / is the offered load. Her
ECE 543 Communication Networks I Problem Set 6 Solution 3.26 Define the state to be the number of operational machines. This gives a Markov chain, which is the same as in an M/M/1/m queue with arrival rate and service rate . The required probability is si
16:332:543: Communication Networks I
Delay Models
Summary slide set #4
1
M/G/1 Queue with Priority Classes
10-2
M/G/1 system with arriving customers divided in c priority classes
Class 1 highest priority, class 2 second highest, up to class c which is the
16:332:543: Communication Networks I
Delay Models
Summary slide set #2
1
Topics
2-2
Queueing Models
Exponential Distribution
Memoryless Property
Poisson Process
Continuous-Time Markov Chains
Analysis of M/M/1 Queue
2-3
Sources of Network Delay
Proces
Chapter 5
Link Layer
A note on the use of these ppt slides:
Were making these slides freely available to all (faculty, students, readers).
Theyre in PowerPoint form so you see the animations; and can add, modify,
and delete slides (including this one) and