4G/LTE and VoIP

Q1:    In the following charts,

(a) if MOS >=4, which codec will you choose to reach the best bandwidth utilization. Explain the reason with sufficient details.

(b) Between G.711 5 ms frames and G.711 20 ms frames, which one has better bandwidth utilization?

(c) Between G.711 20 ms frames and G.729 20 ms fames, which one has better bandwidth utilization? ‘ms’ means millisecond.

[NB: Please use the pdf file captioned “WK9_Part2_QoS_KPI” and other resources you may find online]

The answer may take format highlighted below:

A1:   (a)

The first diagram shows the relationship between a codec and MOS score (which measures voice quality). G.7xx are the voice codec. A voice codec is to do Analog to Digital Conversion (Coding) and Digital to Analog conversion (decoding). Coding + decoding = CODEC.

G.711 64 kbps has MOS = 4.3.

G.729AB 8 kbps has MOS =4.0

G.7231A 6.3 kbps bit rate has MOS = 4.0

G.7231A 5.3 kbps bit rate has MOS= 3.5

The first requirement is MOS >=4.0. So, only one of the above codec doesn’t meet the requirement.

G.711 has 64 kbps. It is used in the legacy telephony system. The voice quality is superior. However, it also used the highest # of bits to transmit the same voice. Similar to video. If you use more pixels to represent a video frame, the video quality will be superb. The trade off is that it uses up lots of bandwidth to transmit the video frames.

Our second requirement is that we want to have the best bandwidth efficiency, meaning that we will use the lowest # of bandwidth (in other words, transmit the smallest # of bytes through the channels). Therefore, you want to choose the lowest bit rate to transmit. That’s the answer to (a).

(b) You should take a look of the snap shots along with my explanation. Look at the above left table. G.711 5 millisecond (ms) codec means every 5ms, the codec forms a VoIP packet. The G.711 20 ms codec means every 20 ms, the codec forms a VoIP frame. In each packet, the IP/UDP/RTP headers are added. If you take the first 5 ms codec and collect the VoIP frmaes for 20 ms, then you get 4 frames and 4 times of what 5 ms packet has. The 5 ms codec has 44 bytes of IP/UDP/RTP headers and 40 bytes of VoIP payload (all VoIP data) for a total of 84 bytes. So, for 20 ms, this codec collect 84 x 4 = 336 bytes of packet.

The G.711 20 ms codec has one IP/UDP/RTP header 44 bytes and 40 x 4 = 160 bytes of VoIP data for a total of 44 + 160 = 204 bytes of packet in 20 ms.

So, is G.711 5 ms codec or G.711 20 ms codec more efficient (fewer packets) to send for the same amount of analog voice after converted to VoIP packets? If sending your VoIP packets is charged by # of bytes, which codec will you choose?  That’s the answer. Think about the old telephone system that it was charged by minutes, while today it is charged by # of packets.

(C ) compares G.711 20 ms codec with G.729 20 ms codec. Both of the 20 ms codec forms a VoIP packet every 20 ms. So, both has only one set of IP/UDP/RTP headers, that is 44 bytes. G.711 20 ms codec has 160 bytes of VoIP payload, while G.729 20 ms codec has 20 bytes of VoIP payload. Can you tell which one has fewer total # of packets (more efficient)? That’s the answer.

If you look at the graph above the table, G.711 has 64 kbps, while G.729 has 8 kbps. It’s obvious that G.729 uses fewer bytes / second. In other words, G.729 quality is lower than G.711. It is the trade off between quality and efficiency (data bit rate

Q2: Describe cellular network 4G LTE security protocols in terms of all security associations between two end points, authentication protocols, encryption protocols, client-authenticate-server, server-authenticate-client, and any special security features in sufficient details. [Please use the slide captioned “WK11_Park3_LTE_Security_v2” and other resources online to answer this question]

NOTE:  Use the diagram below to construct your answer. There are 5 Security Associations (SA). Describe them.


Research Paper 101
Calculate your paper price
Pages (550 words)
Approximate price: -

Reasons to trust Research Paper 101

On Time Delivery

We pride ourselves in meeting the deadlines of our customers. We take your order, assign a writer but allow some more time for ourselves to edit the paper before delivering to you. You are guaranteed a flawless paper on a timely manner...

24x7 Customer Live Support

Our team at Research Paper 101 is committed to handling your paper according to the specfications and are available 24*7 for communication. Whenever you need a quick help, you can talk to our writers via the system messaging or contact support via live chat and we will deliver your message instantly.

Experienced Subject Experts

Online Experts from Research Paper 101 are qualified both academically and in their experiences. Many are Masters and Phd holders and therefore, are qualified to handle complex assignments that require critical thinking and analyses...

Customer Satisfaction

We offer dissertation papers as per students’ wishes. We also help craft out the best topics and design concept papers. By ordering with us, you are guaranteed of defending and making through those hard faced professors in the defense panel!

100% Plagiarism Free

We at Research Paper 101 take plagiarism as a serious offence. From the start, we train our writers to write all their papers from scratch. We also check if the papers have been cited appropriately. Our website also has a tool designed to check for plagiarism that has been made erroniusly. In essense, the paper you get will be 100% legit...

Affordable Prices

We understand that being a student is very challenging, some students balance between work and studies in order to survive. We therefore offer pocket friendly rates that are very competitive in the market.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.


Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.


Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.


Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.


Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.