Pearson eText for Software Engineering -- Instant Access (Pearson+)
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Author: Ian Sommerville
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Chapter 21, Problem 21.3E
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Workflow for embedded software for a voice mail system:
The workflow for embedded software for a voice mail system is represented below:
A voicemail system is a centralized system used in businesses for sending, storing and retrieving audio messages.
The steps or processes in the embedded software for a voice mail system are:
- First the phone displays the number of messages.
- Then the while the phone rings, it counts the number of rings and if the number of rings is more than the stipulated limit, then answering mashing is activated which plays message...
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Consider a 2G - GSM mobile phone which has been turned off for a while. The user turns it on and tries to make a phone call to another mobile
phone in the same mobile operator's network which is also a 2G network. Write down ALL messaging between various components of the GSM
architecture and the mobile phone being turned on until the call is established (so do not consider the other side of the phone call) in a timeline
with appropriate messaging and names of the channels being used. When making a phone call assume that the user fails in the first 2 random-
access trials and succeeds on the 3rd random-access trial.
Assignment
Consider a 2G - GSM mobile phone which has been turned off for a while. The user turns it on and tries to make a phone call to another mobile
phone in the same mobile operator's network which is also a 2G network. Write down ALL messaging between various components of the GSM
architecture and the mobile phone being turned on until the call is established (so do not consider the other side of the phone call) in a timeline
with appropriate messaging and names of the channels being used. When making a phone call assume that the user fails in the first 2 random-
access trials and succeeds on the 3rd random-access trial.
In a robotic laboratory of one university, the lab members are testing mobile robots. Each robot has a radio transmitter that it uses to communicate with a base station, and they find that if the robots get too close to one another, then there are problems with interference among the transmitters. So a problem arises: how to plan the motion of the robots in such a way that each robot gets to its intended destination, but in the process the robots don’t come close enough together to cause interference problems.
This problem could be modeled as: suppose that we have an undirected graph G=(V,E), representing the floor plan of a building, and there are two robots initially located at nodes a and b in the graph. The robot at node a wants to travel to node c along a path in G, and the robot at node b wants to travel to node d. This is accomplished by means of a schedule: at each time step, the schedule specifies that one of the robots moves across a single edge, from one node to a…
Chapter 21 Solutions
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