Summer Examination Period 2021 – May/June - Semester B ECS725P Mobile Services 

Duration: 3 hours 

This is a 3-hour online exam, which must be started within a 24-hour period. You MUST submit your answers within 3 hours of the time that you started the exam. Follow instructions on the download page. You must upload a single PDF document containing your solutions. These can be typed or handwritten, or a mix of the two. Multiple submissions are not permitted, so be sure that you check your submission before uploading it. Calculators are not permitted in this examination. Answer FOUR questions You MUST adhere to the word limits, where specified in the questions. Failing to do so will lead to those answers not being marked. YOU MUST COMPLETE THE EXAM ON YOUR OWN, WITHOUT CONSULTING OTHERS. Examiners: Dr. Stefan Poslad, Dr. John Schormans Queen Mary University of London, 2021 Page 2 ECS725P (2021) Question 1 a) Describe how the basic Information Communication Technology (ICT) system functions of computation (C), networking (N), Information resource management (I) and human interaction (H) can be distributed in a client-server system model to support a healthy-living application. [7 marks] b) Differentiate between using a thin versus thick client-server model and then contrast how we can distribute a two (machine versus human) player game using a thin versus a thick client-server model. [8 marks] c) Compare and contrast how a servant (or peer to peer) model versus a client-server model communicates and briefly discuss how a servant model could be applied as a distributed system design to enable a healthy living scenario application. [10 marks] ECS725P (2021) Page 3 Question 2 a) What is a Wireless Personal Area Network (WPAN) and is there a difference between a WPAN versus a WBAN (Body Area Network)? [8 marks] b) Discuss the benefits of using 6LoWPan over Bluetooth or Zigbee for a WPAN healthy living application. [10 marks] c) Describe the differences in the 6LoWPan versus Bluetooth or Zigbee network protocol stack. [7 marks] Turn Over Page 4 ECS725P (2021) Question 3 a) Explain why spatial-awareness or a Location-Based Service (LBS) has been recognised as being one of the core apps for mobile device services and describe two challenges when this service is offered. [7 marks] b) Compare and contrast two single sensor methods to determine a position indoors. [4 marks] c) Describeanalgorithmtodeterminethedistancetoadestinationusingpedestriandead reckoning that requires direction changes. d) Consider also what if any, types of sensor error can arise in c). [10 marks] [4 marks] ECS725P (2021) Page 5 Question 4 a) Define each of these two terms: explicit Human Computer Interaction (eHCI) and Implicit HCI (iHCI). [4 marks] b) Justify why iHCI is better suited as a type of user interaction model for mobile devices than the use of eHCI. [6 marks] c) Explain why a PC style graphical user interface is problematic on mobile phones. [6 marks] d) Discuss solutions used to enhance human computer interaction in smart phones. [9 marks] End of Paper Turn Over