EEL 4599 Wireless & Mobile Networks Spring 2024 HW1 Worksheet - Due Friday, January 22, 11:59pm Homework Assignments are Individual Assignments. Studying with others is okay to get the concepts. Any copied or duplicated work will be considered cheating. HW 1 has 2 parts – the worksheet (30 points) and the quiz (70 points). This is the HW1 worksheet. Answer the questions below. Answers must be in your own handwriting (on tablet or on paper). Points will be deducted for typed answers. Scan and save your HW1 worksheet in a file called <lastnameHW1.pdf>. Submit your file to the HW1 Worksheet Assignment link in Canvas. Then you will take the HW1 quiz. It is open book, open web, open worksheet, but you will not be given the HW 1 Worksheet answers before the HW1 Quiz. 1. Which layer of the OSI 7-layer model is responsible for each of the following functions? a. Determining the best path to route packets. b. Provides quality of service (QoS) and reliable end-to-end transfer of data. c. Error control over a single hop physical link d. Transfer of bits between adjacent devices. e. Defines the format/representation of the data. 2. The data link layer and the transport layer have similar functions in the network, so they have several features in common. Describe one of these features and explain why this feature is needed at both layers. 3. Describe the two protocols that are commonly associated with the Data Link Layer. Explain why there is a need for two. 4. Consider the IEEE802.15.4 (Zigbee) frame shown. List the seven OSI layers. For each layer, a. State whether or not the layer is represented in the packet. If the layer is not used, put N/A. b. Identify how many Bytes are reserved for each OSI layer. For example, 6Bytes are reserved in the PHY field for the Physical Layer. Sometimes packets leave out certain layers. c. Assuming the Zigbee data rate is 250Kbs and that the 41B payload contains all message bits... i. Calculate the frame efficiency of the frame shown. ii. Calculate the effective data rate, Reff. 5. Give two features that the data link layer and transport layer have in common. Give two features in which they differ. 6. A computer generates a TCP segment consisting of 1500 bits of payload and 160 bits of header information is sent to the IP layer of a device, which appends another 320 bits of header information, followed by the Data Link Layer/MAC layer, which appends 26Bytes and the Physical Layer, which appends 6 Bytes. This packet must be transmitted using an Xbee device which has a maximum payload size of 41Bytes. How many bits total, including header information, are sent from the Xbee to the destination to deliver the EEL 4599 Wireless & Mobile Networks Spring 2024 message? 7. Open the Frequency Allocation charts for the US, the UK and Canada: US: https://www.ntia.doc.gov/files/ntia/publications/january_2016_spectrum_wall_chart.pdf UK: http://www2.aueb.gr/users/courcou/courses/regulation/slides/uk-frequency-allocations.pdf Canada: https://www.ic.gc.ca/eic/site/smt- gst.nsf/vwapj/2014_Canadian_Radio_Spectrum_Chart.pdf/$file/2014_Canadian_Radio_Spectrum_Chart.pdf a) What is the designated use in each for the frequency band 806 to 890 MHz? b) How do the independent allocations of various governments impact the ability of wireless companies to create global wireless standards? 8. Stories abound of people who received radio signals in the metal fillings in their teeth. Suppose someone had one filling that is 2.5mm long that acts as a quarter-wave dipole radio antenna. What frequency would they receive in their filling? Round answer to two decimal places. 9. For the isotropic, half-wave dipole and parabolic antenna listed in Table 5.2 in the Stallings handout: “Week 2- Antennas-Stallings-5-1.pdf” (see course schedule, modules or files for link), a) Calculate the effective area 𝐴 at a wavelength of 300 cm b) Calculate the gain ( 𝐺 𝑎𝑛𝑑 𝐺 ௗ ) at the same wavelength (3 00 cm) Assume for both a) and b) that the actual area (A) for the parabolic antenna is 𝐴 = 𝜋 In answer, round to two decimal places. For example for isotropic, the gain is G=1.00. 10. A microwave transmitter has an output of 0.1 W at a wavelength of 300cm (100MHz). Assume that this transmitter is used in a microwave communication system where the actual area is 𝐴 = 𝜋 for the transmitting and receiving antennas. For this problem, use the gains calculated in the previous problem. a) What is the effective isotropic radiated power (EIRP) 𝑬𝑰𝑹𝑷 = 𝑮 𝒊 𝑷 𝒊𝒏 of the transmitted signal? See below for definition of EIRP. b) What is the effective radiated power (ERP) 𝑬𝑹𝑷 = 𝑮 𝒅 𝑷 𝒊𝒏 of the transmitted signal? See below for definition of ERP. EIRP is defined as the baseline power input in watts required for a lossless isotropic antenna to output the same maximum power density far from the antenna as the actual transmitter outputs. It is equal to the power input to the transmitter's antenna multiplied by the isotropic antenna gain. ERP is defined as the power input in watts required for a lossless half-wave dipole antenna to output the same maximum power density far from the antenna as the actual transmitter outputs. It is equal to the power input to the transmitter's antenna multiplied by the antenna gain relative to a half-wave dipole. 11. Assume that two antennas are half-wave dipoles and each has a directive gain of 5dB . If the transmitted power is 0.5 W and the two antennas are separated by a distance of 15km , what is the received power? Assume that the antennas are aligned so that the directive gain numbers are correct and that the frequency used is 6 00MHz