Question

answer A and B

For a node equipped with multi-beam directional antenna, is it possible for some antenna veam the node to transmit the packets in a given time slot while the remaining beams are receiving the concurrently? (2 points) (9) Define the node capture effect in directional communication. (2 points) 04: (a) Kist four advantages of CRN. (4 points) 1.5 (b) List three major disadvantages of the spectrum handoff in cognitive radio networks. (3 points) ( With the heln of a diagram aynlain how does the leaky hueket echama emaathan the latu . -

Answer 1

Thor ů Tour Advantages of CRN: There are many advantages, I will list few of them here. lo It gives us a wide range of spectrum utilization and efficiency. 2. Very lower in cost 3. It improves link reliability very much 4. It has very simple Network architecture, so it can be easily configured and very easy to upgrade. b) Disadvantages of the Spectrum handott in cognitive Radio Networks: - I will list few of the disodvantag es below. 1. To achieve a distruption free service orie should have the latency of the handoff as Very low. The change from the present band of communication

to the new band should be very swift so that the distreption time is recluced to minimum. a. In CRN, to maintain a Qos is very difficult. Since the modelling of the spectrum handoff in the presence of multiple interruptions from the primory user interjections. 3 To detect (spectrum Sensing) of the channel for any primary user (po's) anival while the secondary user (so's) is trourmittice data instantly and accurately all the time is tiresome task 4. Specrum management, Spectrum Sharing and spectrum mobility of the CRN should be maintained in o ideal condition ter effective Transmission which again is Algorithm dependent. Hope the question is Answered. Have a nice day! Do live your reting!