76 lines
1.7 KiB
Markdown
76 lines
1.7 KiB
Markdown
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#net
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# Gateway
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- Connects IoT devices to internet
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- Operator deployed
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- LTE etc
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- Self-deployed
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- Wi-Fi
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## Roles
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- Machine-to-machine connections
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- Cheaper telecoms cost
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- Cheaper hardware
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- Not everything has to be LTE connected
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- Simpler config
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- Translate protocols between IoT and internet
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- Processing data
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- Encrypting, filtering, consolidating
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- Boundary between networks
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- Security
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# Network Module
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- 802.15.4 only a channel
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- End-to-end provided by network module
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- Multi-hop wireless network
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- Wireless sensor networks (WSN)
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- Wireless mobile ad hoc networks (MANET)
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- Wireless mesh network (WMN)
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- Vehicular ad hoc network (VANET)
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## Roles
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- Management
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- Packet
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- Adapting size and format
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- Address
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- Adapting and/or resolving addresses
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- Device
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- Joining/leaving of nodes
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- Service
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- Add-ons such as security
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- Operational
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- Route discovery & maintenance
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- Packet forwarding
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# Performance
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- Power consumption
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- Limited supply
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- Significant power in communications
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- Network Lifetime
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- Duration of proper operation
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- Before no longer provides services
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- When a node fails
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- Design-time
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- Design deployment that will last
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- Run-time
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- Dynamic operation to conserve energy usage
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- All layers
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- App
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- Consolidating data
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- Adaptive frequency for data grouping
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- Network
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- Avoid aggressive topology maintenance
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- MAC
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- Duty-cycle MAC to keep radio asleep
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- Physical
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- Power level control
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## Issues
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- Bottleneck
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- One node relaying lots of data
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- Bad placement of gateway
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- Low power devices
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- Multi-hop
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