R1. What is the difference in how wireless hosts are connected and what services must be provided between “Infrastructure mode” and “ad hoc” mode?

R3. Define and explain how each are different:

path loss,

multipath propagation,

interference from other sources

R5. Why are beacon frames used in 802.11 ?

R8. How are Ethernet and 802.11 frame structures different?

R14. What frame structure mode of operation types are supported by Wi-max? What does Wi-max architecture resemble?

R19. What are the purposes of the HLR and VLR in GSM networks? What elements of mobile IP are similar to the HLR and VLR?

R21. What are the three approaches that can be taken to avoid having a single wireless link degrade the performance of an end- end transport-layer TCP connection?

Chapter 6 Problems

P6. Looking at CSMA/CA: In step 4 of the CSMA/ CA protocol, a station that successfully transmits a frame begins the CSMA/ CA protocol for a second frame at step 2!, rather than at step 1. Why not transmit the second frame immediately (if the channel is sensed idle)?

P7. Suppose an 802.11b station is configured to always reserve the channel with the RTS/ CTS sequence. Suppose this station suddenly wants to transmit 10,000 bytes of data, and all other stations are idle at this time. As a function of SIFS and DIFS (this means the equation contains SIFS and DIFS as the only unknown variables), and ignoring propagation delay and assuming no bit errors, calculate the time in seconds required to transmit the frame and receive the acknowledgment. Assume transmission rate of 11Mbps. Suggestion: list the frames that must be sent, compute size and time of each and yes you do know the size of the control frames, then add it up. Show your work.

P9. Looking at the 802.15.1 Bluetooth frame- How many address bits support active connections in a Bluetooth frame header? How many active slaves can be supported? How many total connections?

P11. In Section 6.5, one proposed solution that allowed mobile users to maintain their IP addresses as they moved among foreign networks was to have a foreign network advertise a highly specific route to the mobile user and use the existing routing infrastructure to propagate this information throughout the network. We identified scalability as one concern. Suppose that when a mobile user moves from one network to another, the new foreign network advertises a specific route to the mobile user, and the old foreign network withdraws its route. Consider how routing information propagates in a distance-vector algorithm (particularly for the case of inter-domain routing among networks that span the globe).

Will other routers be able to route datagrams immediately to the new foreign network as soon as the foreign network begins advertising its route?   Why or Why not?

Is it possible for different routers to believe that different foreign networks contain the mobile user? Why or Why not?

HOW DO YOU STUDY IN GENERAL?

WHAT ARE YOUR PHASES OF STUDYING ENGINEERING CLASSES?

EX) 1. READ THE WHOLE CHAPTERS 2. SOLVE EXAMPLES 3. SOLVE PROBLEMS IN THE BACK

EX) 1. SOLVE PROBLEMS IN THE BACK 2. SOLVE EXAMPLES 3. READ THE WHOLE CHAPTER, ETC

PLEASE BE SPECIFC AND PROVIDE THE DETAILS ON HOW DO YOU STUDY EACH CLASSES:

SOFTWARE CLASSES, PROBLEM SOLVING CLASSES (DSP, ELECTRONICS AND ELECTRICAL, AND COMMUNICATION, ENGINEERING MATH ETC)

HAVE YOU MEMORIZED CERTAIN PROCEDURES, CONCEPTS AND STEPS ON SOLVING QUESTIONS?

PLEASE PROVIDE YOUR REAL ANSWERS NOT VAGUE DESCRIPTIONS THAT DOES NOT TELL ANYTHING

Suppose that the following processes arrive for execution at time 0 in the order A, B, C:

1. Determine the execution order (with the time marks) of these process using the following 4 schedulings: FCFS, SJF, a non-preemptive priority, and RR (time slice = 2).
2. What is the waiting time of each process for each of the scheduling algorithm? Which scheduling algorithm achieves the shortest average waiting time?

Could some give a deep descripition about the power factor.
1. How the power factor will be less?
2.What should we do inorder to increase the power factor?
3.How do we maintain a good power factor in a 3 phase motor without using the capacitor?

Write an Arduino Program that detects a reflective surface using the line sensor array of a QTR-3RC (*Must be specific to this sensor! please this is important*)

Must include a function that when called returns..
0 (line to the left of the robot)
1 (line under the robot on the left side)
2 (line under the robot on the right side)
3 (line to the right of the robot)

Output the results to the serial port in 0.5 second intervals

PLEASE USE CODE SPECIFIC TO QTR-3RC SENSOR!!!!!! I have already looked at the Arduino website for the code and many other codes online, I will know if it from a website. I don't mean to be harsh, just please don't waste my money. Please do not answer it unless you know how to answer it.

Write an Arduino Program that detects a reflective surface using the line sensor array of a QTR-3RC (*Must be specific to this sensor! please this is important*)

Must include a function that when called returns..
0 (line to the left of the robot)
1 (line under the robot on the left side)
2 (line under the robot on the right side)
3 (line to the right of the robot)

Output the results to the serial port in 0.5 second intervals

PLEASE USE CODE SPECIFIC TO QTR-3RC SENSOR!!!!!!

How to generate spectral plots in MatLab of transfer function

hw = (0.15*s^3+937500*s)/(0.15*s^3+375*s^2+1062500*s+2500000000)

over the range from 100 Hz to 10 kHz, using 200 points per decade.

A contractor was required to deliver and install windows by a certain date, and as the date approached, refused to perform on time unless the owner agreed to increase the contract price. The owner reluctantly agreed in order to avoid a delay to the final completion date. After the contract was complete, the owner refused to pay the additional money. The window installer makes a claim for the additional fees. Will he be successful in making his claim? Explain your reasoning.

4. A contract is said to be a "legally enforceable promise." Describe three situations where a court will refuse to enforce a “contract”.

1. How does the built-in RS latch in the miscellaneous digital parts bin differ from the NAND gate circuit in E6A-1.MS7?

2. Do the type-D and JK flip flops respond to the same clock edge?

3. Explain how toggle mode is the same as division by two.

4. What is the difference between a synchronous input (D, J, or K) and an asynchronous input (PR or CLR)?

can anyone explain about PIC timers calculations and working

PIC18f67j50