Telecommunication Modelling and Simulation

Assessment Author

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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 in your Unit Description.

MIT/SITE | ME601 Telecommunication Modelling and Simulation | Trimester 1802 Ass. 1 Page 2 of 5

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.

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 (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 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.

MIT/SITE | ME601 Telecommunication Modelling and Simulation | Trimester 1802 Ass. 1 Page 3 of 5

[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.

(c) Explain in detail how the multiple access schemes (MACs) CP-OFDMA, OFDMA, SCMA, NOMA and from each other. These are potential MACs for 5G mobile.

[5+5+10 = 20 marks]

MIT/SITE | ME601 Telecommunication Modelling and Simulation | Trimester 1802 Ass. 1 Page 4 of 5

Marking Criteria

The following shall be used to grade your submission.

Content Knowledge (Marks: 60% )

Ability to Communicate (Marks: 20%)

(Marks: 10%)

Basic Language Skills (Marks: 10%)

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.

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.

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.

The students 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.

MIT/SITE | ME601 Telecommunication Modelling and Simulation | Trimester 1802 Ass. 1 Page 5 of 5

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.

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.

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