Telecommunication networks

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ME601_Ass1_Tr1802_Questions.pdf

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Assessment Details and Submission Guidelines

School School of Information Technology & Engineering (SITE)

Course Name Master of Engineering (Telecommunications)

Unit Code ME601

Unit Title Telecommunication Modelling and Simulation

Assessment Author

Dr. Amoakoh Gyasi-Agyei

Assessment Type Written, Individual Work

Assessment Title Assignment 1 (Individual Work)

Unit Learning Outcomes covered in this assessment

a. Design, analyse and evaluate wireless mobile communication systems;

b. Research and analyse recent developments, and relate them to the principles of mobile network design and network management;

c. Apply engineering techniques, tools and resources to plan and model cellular networks;

Weight 10%

Total Marks 140

Word/page limit Maximum 2000 words (8 A4 pages)

Release Date Week 2, 27th July 2018

Due Date Week 7 (27th August 2018, 12 midnight on Monday)

Submission Guidelines

 All work must be submitted on Moodle by the due date along with a completed Assignment Cover Page.

 The assignment must be in MS Word format, 1.5 spacing, 11-pt Calibri (Body) font and 2 cm margins on all four sides of your page with appropriate section headings.

 Reference sources must be cited in the text of the report, and listed appropriately at the end in a reference list using IEEE referencing style for School of Business and School of Information Technology and Engineering respectively.

Extension  If an extension of time to submit work is required, a Special Consideration Application must be submitted directly to the School's Administration Officer, in Melbourne on Level 6 or in Sydney on Level 7. You must submit this application three working days prior to the due date of the assignment. Further information is available at: http://www.mit.edu.au/about-mit/institute-publications/policies-procedures-and- guidelines/specialconsiderationdeferment

Academic Misconduct

 Academic Misconduct is a serious offence. Depending on the seriousness of the case, penalties can vary from a written warning or zero marks to exclusion from the course or rescinding the degree. Students should make themselves familiar with the full policy and procedure available at: http://www.mit.edu.au/about-mit/institute- publications/policies-procedures-and-guidelines/Plagiarism-Academic- Misconduct-Policy-Procedure. For further information, please refer to the Academic Integrity Section in your Unit Description.

http://www.mit.edu.au/about

http://www.mit.edu.au/about-mit/institute-publications/policies-procedures-and-guidelines/special-considerationdeferment

http://www.mit.edu.au/about-mit/institute-publications/policies-procedures-and-guidelines/Plagiarism-Academic-Misconduct-Policy-Procedure

Instruction:

The above table is meant for your guide and should not be part of your submission. Download the

assignment cover page on Moodle, complete it and make it the cover page of your submission.

Question 1:

(a) Discuss the reasons why multiple antennas are sometimes mounted at the same height on the same antenna tower.

(b) Assume that an eNodeB uses two sets of antennas which are mounted one set above the

other on the same antenna tower. Discuss what should be the minimum vertical separation between the two sets of antennas for proper system functioning.

[10 + 10 = 20 marks]

Question 2

The size of Melbourne city in the Victorian State of Australia is about 9,990 square kilometers. Assume that a telecommunications operator called Telstra has 100% mobile cellular coverage of entire Melbourne. Compute the maximum number of cell sites that Telstra needs to cover the entire area if it uses:

(a) micro-cells, each of radius 500 m. (b) macro-cells, each of radius 20 km. (c) Use CelPlanner® software to illustrate your design.

Assume that each cell has a hexagonal shape. [5+5 + 10 = 20 marks]

Question 3 (40 marks)

A cellular system which uses microcells of radius 500 m and the cluster size of 3 requires the minimum signal-to-interference ratio (SIR) of 24 dB. (a) Compute the average reuse distance D for the path loss exponent of (i) 2 and (ii) 4. (b) Compute the worst-case reuse distance D for path loss exponents of (i) 2 and (ii) 4. Assume in all cases that the CCI far outweighs all other types of noise in the system.

[10 + 10 = 20 marks]

Question 4

Assume an operator has acquired a 20-MHz bandwidth from a local radio frequency spectrum regulator to roll out a mobile cellular network based on LTE-Advanced technology using a cluster size of C=4. In LTE, the smallest unit of frequency resource which can be allocated to one user is called a physical resource block (RB). One RB occupies 180 kHz of frequency, lasts 0.5 ms in time, and it is made of either twelve 15-kHz OFDM subcarriers or twenty-four 7.5-kHz OFDM subcarriers. The operator divides the 20 MHz into 100 RBs occupying 18 MHz. The remaining 2-MHz bandwidth is used as guard bands. Place the traffic channels in the cells such that both the ACI within a cluster and CCI (co-channel interference) between clusters are minimized. Explain your cellular system design (i.e., cell planning and frequency planning) using appropriate diagrams.

[20 marks]

Question 5 A cell in a mobile cellular network serves a number of users, each of which on the average generates a single call of duration 3 minutes during the busy hour. Each blocked call is not queued but cleared. The grade of service of the network is 2%. The number of duplex traffic channels assigned to the cell is 21.

(a) Compute the maximum number of users that the cell can serve at the same time if no sectoring is used.

(b) How many users can the cell serve simultaneously if the cell is divided into: (i) 3 sectors each covering 120o? (ii) 6 sectors each covering 60o?

Assume that channels are shared equally among the sectors of a given cell.

[5+10+5 = 20 marks]

Question 6 A mobile system serving a large city has the following parameters:

 base station antenna height above ground is 200 m

 mobile station antenna height is 2.2 m

 operating frequency is 0.8 GHz. Compute the largest radius that a cell in the mobile system can be in order to keep the total link path loss within 70 dB. Assume that as the cellular system designer, the only path loss model available to you is the Okumura- Hata path loss model.

[20 marks]

Question 7 (a) Explain the purpose of multiple access schemes in cellular mobile networks.

(b) Differentiate between multiplexing and multiple access schemes as used in cellular mobile

networks.

and DFT-spread OFDM differ from each other. These are potential MACs for 5G mobile.

[5+5+10 = 20 marks]

Marking Criteria

The following shall be used to grade your submission.

Content Knowledge

(Marks: 60% )

Ability to

Communicate

(Marks: 20%)

Academic Discourse

Skills (Marks: 10%)

Basic Language

Skills (Marks: 10%)

5 Student demonstrates

outstanding

understanding and

content knowledge

beyond the scope

required by the

assignment task. The

system design

methodology is

technically sound.

The Lecturer

understands the

content completely;

if there are any

mistakes they do

not interfere with

the meaning.

Referencing style is

100% in accordance

with the IEEE

standards.

There is a clear logical

argument, with the

points well ordered

and fully supported. It

responds

appropriately to the

question asked.

Enough relevant

literature is cited to

support work.

Pleasingly broad

range of sentence

structure and

vocabulary is used.

Telecommunication

terminology is used

correctly.

4 Student demonstrates

sound basic knowledge

and understanding of

the relevant subject

matter. The system

design methodology is

technically fairly

sound.

Lecturer

understands the

content, although

some sections need

to be read more

than once.

The answer responds

more or less to the

question asked. The

use of supporting

evidence, illustration

and argument is

relevant but not

necessarily sufficient.

There is a good

range of sentence

structure and

terminology with a

number of minor

errors in word

formation or

spelling.

3 Student exhibits

adequate basic

knowledge of the topic

area.

Lecturer mostly

understands the

content, despite

occasional difficulty.

A point of view is

presented, but it is

not always clear.

Attempts to include

supporting evidence,

illustration or

argument are made.

While there are

noticeable

language errors,

these do not

significantly

interfere with the

lecturer

understanding the

content.

2 The student’s apparent

knowledge and

understanding of

relevant content is

limited.

Lecturer has

difficulty

understanding the

content, although

there are signs of

meaning breaking

through.

The argument does

not progress

smoothly. Main

points and supporting

material are not

clearly distinguished

from each other.

The range of steps

expressed correctly

is limited. Errors in

terminology,

grammar, word

choice, word

formation and

spelling cause

difficulty for the

marker.

1 Student shows little

evidence of knowing

the relevant content.

The marker can

hardly understand

the content of the

submitted report.

The ideas or facts

presented have little

apparent relation to

each other or to the

question asked.

Errors in sentence

structure,

terminology, word

choice, word forms

and spelling

predominate and

prevent

communication.

0 1. The answer is copied or substantially copied from materials or other sources (plagiarism).

2. No relevant attempt has been made by student to solve the questions.