Questions On Cross-Layer Design For Wireless Multimedia Networks

Cross Layer Design for Wireless Multimedia Networks Assignment 1

1. Which of the following uses the widest spectrum? (a) 802.16 (b) 802.11 (c) CDMA-2000 (d) UWB
Ans: UWB

2. Which of the following is true? (a) Small-scale multipath fading is the primary driver behind wireless communication system design. (b) In the free space loss model, there is no frequency effect. (c) Data throughput in sensor networks is a bigger concern than that in mobile ad hoc networks. (d) Cross-layer design simplifies the implement of wireless systems.
Ans: (a) Small-scale multipath fading is the primary driver behind wireless communication system design.

3. What are the advantages and
So its just design is to break the N level PDU into sections and reassemble them in the request they were available before. The division happens at (N- 1) layer. It breaks the N level PDU into different (N-1) level PDUs. Additionally they do not need to hold a duplicate of header as it disregards the guideline of layer separation itself.

(b)Yes, every N-level PDU must hold its own header. More than one Nth layer PDU an be set inside the (N-1)th layer PDU and all the Nth layer PDU’s must have the same destination address. N-1 level is not aware of the N layer PDU and it is only a data segment for it and it also violates the principle of layer separation if the data is consolidated into single N level PDU with single N level
What are the strong aspects and weak aspects in the following paper? B. Fu, Y. Xiao, H. Deng, and H. Zeng, “A survey of cross-layer designs in wireless networks,” IEEE Comm. Surveys and Tutorials, vol. 16, pp. 110-126, First Quarter 2014.
Ans: Strong aspects:

1) In this paper,it explain the boundaries or the extends and difficulties the cross layer networks are having,like how the information sharing is done between the different layers and the problems which we sometime face when the connection between the layers is established, when there is temporary loss of connection. Moreover the paper describes how the performance and reliability can be achieved in the network by reducing the error rate,the reduced latency.

2) It describes the alternate methods that could be applied in the different layers according to the need like as the example is given in the real time video streaming the day sensitive application we could make use of the optimsation techniques by using the different frameworks which provide with alternate protocol stack and the design parameters which are different and can achieve a proper solution to the issue