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Lernmaterialien für System Design for the Internet of Things an der TU München

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TESTE DEIN WISSEN
Which modulation type is used by SigFox? What is the maximum transmission rate?
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TESTE DEIN WISSEN
Binary Phase Shift Keying (BPSK). Rate is 100 b s −1
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TESTE DEIN WISSEN
challenges of Io
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TESTE DEIN WISSEN
•Security: how to keep our data private and protect it from unauthorized access? (e.g. personal health information) •Power supply: how to power mobile nodes? Maintenance would not be feasible if bat- teries of several billion devices need to be replaced each yea
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TESTE DEIN WISSEN
dispatch byte
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TESTE DEIN WISSEN
The dispatch byte is the first byte of link layer payload. It indicates if the following data is a 6LoWPAN packet and which compression of the header is used.
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TESTE DEIN WISSEN
Which parameters could be optimized to reach a desired runtime of 20 years?
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TESTE DEIN WISSEN
•Lower power consumption during sleep (e.g. 5 μW possible) •Higher battery capacity but increased weight and cost
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TESTE DEIN WISSEN
Given a network with Nnodes. How many point to point links are possible for a star topology and for a mesh topology where each node is connected to each other nod
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TESTE DEIN WISSEN
Star: one server, the rest of the nodes are connected to the server: N−1 Mesh: number of possibilities to select 2 out of N:(N over 2)
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TESTE DEIN WISSEN
difference between dispatcher and schedule
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TESTE DEIN WISSEN
The scheduler selects the next process that should run by using a certain strategy. The dispatcher performs the context switch so that the next process will run on the processor. Today the dispatcher is often integrated into the scheduler.
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TESTE DEIN WISSEN
scheduling strategies
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TESTE DEIN WISSEN
•Round-Robin: cyclic switching between tasks without considering priority or deadlines. A task switch occurs when a task was running for 2 time intervals or terminates. •Priority Scheduling: when a task finishes or a new task is started, the task with the highest priority is selected. •Earliest Deadline First (EDF): when a task finishes or a new task is started, the task with the earliest deadline is selected.
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TESTE DEIN WISSEN
fundamental concept of Linux is “everything is a file advantage disadvantages
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TESTE DEIN WISSEN
Advantage: high abstraction: writing to a bus, sending to web-server and writing to a file on disk is handled in the same way. Disadvantage: increased overhead: less efficient, higher memory requirements
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TESTE DEIN WISSEN
Resolution, Accuracy, Precision
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TESTE DEIN WISSEN
•Resolution is the smallest fraction that an instrument can detect/distinguish •Accuracy is the closeness of the measured signal to a reference value. •Precision is being able to provide the same measured signal for the same reference value ADC resolution is the number of steps in which a voltage can be resolved. The accuracy defines how close the measured voltage is compared to a reference voltage which is assumed to be the exact or “true” voltag
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TESTE DEIN WISSEN
Energy Haresting
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TESTE DEIN WISSEN
often needs an energy storage as buff
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TESTE DEIN WISSEN
Compare IoT to Wireless Sensor Networks (WSN)
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TESTE DEIN WISSEN
IoT includes interaction, WSNs just collect data IoT is not necessarily wireless
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TESTE DEIN WISSEN
differences between Flash Converter and a Successive Approximation Conver
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TESTE DEIN WISSEN
•Flash Converter: one comparator for each bit –Advantage: fast sampling –Disadvantage: high hardware effort, high power dissipation –Application: Oscilloscopes, Signal Processors •Successive Approximation Converter: one comparator, one DAC –Advantage: lower hardware effort, lower power dissipation –Disadvantage: slower –Application: Embedded microprocessors (e.g. most stm32)
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Q:
Which modulation type is used by SigFox? What is the maximum transmission rate?
A:
Binary Phase Shift Keying (BPSK). Rate is 100 b s −1
Q:
challenges of Io
A:
•Security: how to keep our data private and protect it from unauthorized access? (e.g. personal health information) •Power supply: how to power mobile nodes? Maintenance would not be feasible if bat- teries of several billion devices need to be replaced each yea
Q:
dispatch byte
A:
The dispatch byte is the first byte of link layer payload. It indicates if the following data is a 6LoWPAN packet and which compression of the header is used.
Q:
Which parameters could be optimized to reach a desired runtime of 20 years?
A:
•Lower power consumption during sleep (e.g. 5 μW possible) •Higher battery capacity but increased weight and cost
Q:
Given a network with Nnodes. How many point to point links are possible for a star topology and for a mesh topology where each node is connected to each other nod
A:
Star: one server, the rest of the nodes are connected to the server: N−1 Mesh: number of possibilities to select 2 out of N:(N over 2)
Mehr Karteikarten anzeigen
Q:
difference between dispatcher and schedule
A:
The scheduler selects the next process that should run by using a certain strategy. The dispatcher performs the context switch so that the next process will run on the processor. Today the dispatcher is often integrated into the scheduler.
Q:
scheduling strategies
A:
•Round-Robin: cyclic switching between tasks without considering priority or deadlines. A task switch occurs when a task was running for 2 time intervals or terminates. •Priority Scheduling: when a task finishes or a new task is started, the task with the highest priority is selected. •Earliest Deadline First (EDF): when a task finishes or a new task is started, the task with the earliest deadline is selected.
Q:
fundamental concept of Linux is “everything is a file advantage disadvantages
A:
Advantage: high abstraction: writing to a bus, sending to web-server and writing to a file on disk is handled in the same way. Disadvantage: increased overhead: less efficient, higher memory requirements
Q:
Resolution, Accuracy, Precision
A:
•Resolution is the smallest fraction that an instrument can detect/distinguish •Accuracy is the closeness of the measured signal to a reference value. •Precision is being able to provide the same measured signal for the same reference value ADC resolution is the number of steps in which a voltage can be resolved. The accuracy defines how close the measured voltage is compared to a reference voltage which is assumed to be the exact or “true” voltag
Q:
Energy Haresting
A:
often needs an energy storage as buff
Q:
Compare IoT to Wireless Sensor Networks (WSN)
A:
IoT includes interaction, WSNs just collect data IoT is not necessarily wireless
Q:
differences between Flash Converter and a Successive Approximation Conver
A:
•Flash Converter: one comparator for each bit –Advantage: fast sampling –Disadvantage: high hardware effort, high power dissipation –Application: Oscilloscopes, Signal Processors •Successive Approximation Converter: one comparator, one DAC –Advantage: lower hardware effort, lower power dissipation –Disadvantage: slower –Application: Embedded microprocessors (e.g. most stm32)
System Design for the Internet of Things

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