System Design for the Internet of Things at Universität zu Köln

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Study with flashcards and summaries for the course System Design for the Internet of Things at the Universität zu Köln

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

RPL Repair (Local repair)

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

How is a DODAG constructed? Shortly describe the main steps

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

routing metrics

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

requirements of RPL

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

At which OSI layer does RPL operate?

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

What does the acronym RPL mean?

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

What are the SAC, SAM, DAC, and DAM bits used for?

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What is the CID byte and how is it used?

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

The HLIM bits are used to compress the hop limit with the 4 possibilities: carried in-line in next byte, value = 1, value = 64, value = 255. When is this compression problematic?

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

Look up RFC 6282. What is the NH bit?

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

How many bytes are required for a 6LoWPAN header with IPv6 + UDP header at maximum compression?

Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

RPL Repair (Global Repair)

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Exemplary flashcards for System Design for the Internet of Things at the Universität zu Köln on StudySmarter:

System Design for the Internet of Things

RPL Repair (Local repair)
In local repair the disconnected node simply tries
to connect to another node in the following order:
1. stay connected to a second parent if available
2. connect to a sibling with the same rank
3. connect to the next available node with the lowest rank

System Design for the Internet of Things

How is a DODAG constructed? Shortly describe the main steps
1. Building process starts at the root, which is configured by the system administrator.
The root broadcasts a DODAG Information Object (DIO) message, advertising its own
rank.
2. Each node that recieves the DIO messages, checks if the advertised rank is lower than
its own and selects the sender as parent if true. Afterwards, it calculates its own new
rank and advertises it to all its neighboring nodes.
3. Step 2 is repeated until every node knows its final rank and has joined the DODAG.

System Design for the Internet of Things

routing metrics
•Throughput
•Hop count
•Link-Quality Level (LQL)
•Residual energy of nodes
•Latency

System Design for the Internet of Things

requirements of RPL
Adaptive routing: dynamically recompute paths to optimize different metrics
Constraint-based routing: consider various constrained node characteristics (CPU, bat-
tery, latency)
Comunication types: support point-to-multipoint (P2MP) and point-to-point (P2P) com-
munication
Scalability: support networks with up to 1000 nodes.
Automatic configuration: support joining the routing domain without intervening in the
configuration

System Design for the Internet of Things

At which OSI layer does RPL operate?
Network layer 3

System Design for the Internet of Things

What does the acronym RPL mean?
Routing Protocol for Low-Power and Lossy Networks.
Routing Protocol for LLNs.

System Design for the Internet of Things

What are the SAC, SAM, DAC, and DAM bits used for?
SAC and DAC specify if source and destination addresses are compressed using
stateless or context based compression. SAM and DAM specify how many bits are compressed.

System Design for the Internet of Things

What is the CID byte and how is it used?
The Context Identifier Extension (CID) byte identifies a previously shared IPv6
context.

System Design for the Internet of Things

The HLIM bits are used to compress the hop limit with the 4 possibilities: carried in-line in next byte, value = 1, value = 64, value = 255. When is this compression problematic?
When routing over multiple IP hops, IPHC may not compress the Hop Limit
because it needs to decremented at each hop and may take any value

System Design for the Internet of Things

Look up RFC 6282. What is the NH bit?
Determines if the next header (IPv6, UDP) is compressed or not.

System Design for the Internet of Things

How many bytes are required for a 6LoWPAN header with IPv6 + UDP header at maximum compression?
Dispatch + HC1 + HC2 + hops + 3 bytes UDP = 7 bytes

System Design for the Internet of Things

RPL Repair (Global Repair)
In global repair, the
root node is notified and initiates a complete new DODAG construction.

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