ECE6610: Wireless Networks Spring 2019 Homework 2
Wireless Networks代写 Submission Instructions:Submit your homework as a DOC or PDF file to Canvas and name it with yourgtaccount (where gtaccount
Given: February 18, 2019
Due: March 8, 2019 (Midnight) + 1 week for “off Campus” students
Submission Instructions:Wireless Networks代写
Submit your homework as a DOC or PDF file to Canvas and name it with yourgtaccount(where gtaccount is probably something like gtg7577b or maybe ci16). No hardcopies will be accepted. Scanned pages are fine.Wireless Networks代写
Dr. Ian F. Akyildiz
Ken Byers Chair Professor in Telecommunications Broadband Wireless Networking Laboratory School of Electrical and Computer Engineering
Georgia Institute of Technology, Atlanta, GA 30332
Tel.: 404-894-5141; Fax: 404-894-7883; E-Mail: email@example.com
Question 1 (Wireless Local Area Networks)Wireless Networks代写
a)Weknow that compared to the Access Point (AP), Stations (STA) often have a fewer number of antenna elements. Explain why this is a problem in the context of IEEE 802.11n. How do IEEE 802.11ac and ax solve this problem?
b)Inthe context of IEEE 802.11ad, which entity functions as the PCP? Does it necessarily have to be the AP, or can it be an STA too?
c)Despiteusing the same 60 GHz spectrum, how is IEEE 802.11ay able to offer a much higher throughput when compared to the 802.11ad standard?Wireless Networks代写
d)Identifythe IEEE 802.11 specification best suited to each of the following scenarios:
ii)Short-rangepoint to point backhaul
Question 2 (Ad Hoc Networks)Wireless Networks代写
Consider a scenario where you and five other friends have set up camp in a remote forest. In orderto communicate with each other, you intend to set up an ad hoc network between the six tents. Thelocations of the tents are shown in the figure below. It is assumed that the transmitter in each tenthas the same radio range 4a (the grid size is a) measured from the center of the tent, and that the wireless signal cannot pass through the trees.Wireless Networks代写
a)Findthe network topology of the ad hoc network that you would set up.
b)Yourfriend in Tent 1 wants to send data to you in Tent 5. Using the given network topology, show step by step how this data can be delivered using the DSR routing protocol
Question 3 (Ad Hoc Networks)Wireless Networks代写
Assume that node D wants to send data to node G in the following topology using AODV. The starting sequence numbers of all nodes are also labeled. The lines represent the connectivity between nodes.
a)Drawthe RREQ procedure (assume that D doesn’t know the sequence number of G).Wireless Networks代写
b)WillA receive RREQ? Will H receive RREQ? Will J receive RREQ? Explain.
c)Weknow that every node will create a backward routing table in the route discovery process. What is the backward routing table at A (if A receives RREQ), E and F.
d)Whatis the forward routing table at D after receiving RREP from G. If node H moves away, will G detect it? Will G propagate this link break to other nodes? Explain
Question 4 (Ad Hoc Networks)
Consider the following network. The lines represent the connectivity between nodes.
Assuming that the OLSR protocol is used, find the neighbor (NBR), MPR and MS sets for each node.
Question 5 (Bluetooth)Wireless Networks代写
The School of ECE decides to set up separate Bluetooth communication among professors,gradstudents and undergrad students. This means, professors communicate with other professorsonly, grad students communicate with other grad students only, and undergrad studentscommunicate with other undergrad students only. Bluetooth piconets are formed using Bluetoothenabled mobile phones and the frequencies allotted for hopping for each of the group are listed in the following table:
|Group||Frequencies Allotted Wireless Networks代写|
a)Isthere a possibility of collision occurring under this scenario? If yes, quantify the probability of collision between each pair of the group, i.e. between (i) Professors and Grads, (ii) Grads and Undergrads, and (iii) Professors and Undergrads.Wireless Networks代写
b)Ifthese are the only frequencies available to be allotted, suggest another way of frequency allotment in which there are no collisions.
Question 6 (Bluetooth)
a)InBluetooth, the 3-bit active member address can have 8 different values. However, piconet can have at most 7 slaves. What is the 8th value used for?Wireless Networks代写
b)Whyis there only one 3bit address field in a Bluetooth baseband packet, and not botha source address and a destination address?Wireless Networks代写
c)Aslave in a Bluetooth piconet does not necessarily hear a baseband packet being transmitted in its piconet in every timeslot. It could be that no transmission took place.Explain why this can happen both for the odd (slave to master) and even (master to slave) timeslots.
d)Evenif the slave has a good radio link to the master of the piconet, it might not hearatransmission, although one actually took place in the piconet. Explain how this can happen for both the odd and the even timeslots.Wireless Networks代写
e)Suppose,the slave receives a transmission from a different piconet. How can it detect that the packet belongs to a different piconet?
f)Howdoes a slave know which frequency to listen to next?
Question 7 (Vehicular Ad Hoc Networks)
a)Whatis the difference between WAVE and IEEE 1609?
b)IEEE802.11p and 802.11a both use OFDM. How are they different?Wireless Networks代写
c)AVANETin a city area is shown in the figure below. What is the transmission path you would select to send a message from device G to device A? Can there be multiple paths?