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Answer the given below questions based on the following scenario The existing Human Resources Management System in a project management firm is not satisfying the requirements of the employee payroll computation due the overtime hours and multiple project assignments in the firm. The firm management has decided to develop an advanced, secure HR System to solve this problem. The new system is expected to allow employees to use an electronic card which allows the employees to login to the system and generates and view pay slips based on number of hours worked and total amount of overtime hours. The system verifies the user credentials. The system is expected to run in multiple platforms both web based and mobile versions. The system will have the firm's logo in all the pages. The employee will be able to access and edit only their personal details. The system expected to keep employee data in the firm's database in order to calculate the payroll. The system will allow the employees to know the number of hours, including the overtime hours, worked per day and total of all hours spent on a particular assigned project and total pay received for the same project. The HR system administrator will be able to keep track of all the information including adding new employees, deleting employees, and edit employee information and produce various reports. Only the HR system administrator will be able to generate performance appraisal reports of the employees for benefit administration purposes. The system is expected to handle at least 90% of the employee population to access the system from a web or mobile interface within 5 minutes

Explanation / Answer

Q.1 Consider a Bluetooth scatternet consisting of 2 piconets. What is the probability of a collision between packets of the two piconets? Assume nodes are not using CSMA. Remember that a successful transmission requires both a successful polling message to be sent from the master to slave, and then a successful message sent from slave to master. Assume there are 80 frequencies possible. All piconets constantly have packets they are trying to send and they are not using CSMA.

Answer: Collision between two piconets occur when they transmit on same carrier frequency.

as there are 80 frequencies possible, collision happen when both the piconets choose to transmit on same frequency.

which is equal to 1/80.

a successful transmission is collision free both during the polling message sent from master to slave and during the message sent from slave to master.

probability of successful transmission = (1-1/80)2

probability of collision = 1- (1-1/80)2

                                                         = 79/1600

Please let me know in case of any doubts.

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