Connecting to Multiple Networks using a Single Radio
1
Connecting to Multiple Networks using a Single Radio Ranveer Chandra and Pradeep Bahl Applications Some Solutions Design Constraints Power: Independent power consumption by multiple wireless cards results in drastic reduction of battery life. => Use a single radio, but problems of MAC: Wireless card can be associated to at most one wireless network. Firmware: Wireless cards send packets only after association to a network. Switch the radio across multiple wireless networks. Send packets when the network is active, otherwise buffer. Buffered packets are sent when the network gets activated. MultiNet Approach Transparency: Switching across networks should be transparent to the user. Scalability: The proposed solution should scale with the number of users in the network. Backward Compatibility: The solution should work with legacy wireless cards. Design Principles Buffering • Use Multiple Radios: Have one radio for each desired network. • Use a single radio Software approach to stay connected to multiple networks with a single radio. Problem: Handle packets whose destination has switched to another network using MultiNet. Packets are lost if not unhandled Solution: Buffer packets using PSM at APs for IS networks, and end hosts for AH networks. Victor Bahl Cisco Guy at Microsoft Microsoft Employee Microsoft Employee Ad Hoc Infrastructure Many more applications, such as: • Gateway node of a wireless ad hoc network • Bluetooth scatternets • Extending the range of an infrastructure network MultiNet is implemented as a combination of NDIS IM driver and a user level service Driver: MMD: Miniport instances. One per network, and IP sees each MMD as a different network card. MPD: Manages MMDs, switches card and buffers packets. Service: Maintains synchronization with other MultiNet nodes Sends signals to the IM driver using IOCTLs. Screen Snapshot Switching Strategies Switching strategies are application dependent. Power (MultiNet vs Dual Radio) MultiNet consumes around half the total power consumed by the two radio approach for two networks.
-
Upload
alisa-battle -
Category
Documents
-
view
25 -
download
0
description
Connecting to Multiple Networks using a Single Radio. Victor Bahl. Ranveer Chandra and Pradeep Bahl. Applications. MultiNet Approach. Buffering. Problem: Handle packets whose destination has switched to another network using MultiNet. Packets are lost if not unhandled - PowerPoint PPT Presentation
Transcript of Connecting to Multiple Networks using a Single Radio
Connecting to Multiple Networks using a Single RadioRanveer Chandra and Pradeep Bahl
Applications
Some Solutions
Design Constraints Power: Independent power consumption by multiple wireless
cards results in drastic reduction of battery life.=> Use a single radio, but problems of MAC: Wireless card can be associated to at most one
wireless network. Firmware: Wireless cards send packets only after association to
a network.
Switch the radio across multiple wireless networks. Send packets when the network is active, otherwise buffer. Buffered packets are sent when the network gets activated.
MultiNet Approach
Transparency:Switching across networks should be transparent to the user.
Scalability:The proposed solution should scale with the number of users in the network.
Backward Compatibility:The solution should work with legacy wireless cards.
Design Principles
Buffering
• Use Multiple Radios: Have one radio for each desired network.• Use a single radio Software approach to stay connected to multiple networks with a single radio.
Problem: Handle packets whose destination has switched to another network using MultiNet. Packets are lost if not unhandled
Solution: Buffer packets using PSM at APs for IS networks, and end hosts for AH networks.
Victor Bahl
Cisco Guy atMicrosoft
Microsoft Employee
Microsoft EmployeeAd HocInfrastructure
Many more applications, such as:• Gateway node of a wireless ad hoc network• Bluetooth scatternets• Extending the range of an infrastructure network
MultiNet is implemented as a combination of NDIS IM driver and a user level serviceDriver:
MMD: Miniport instances. One per network, and IP sees each MMD as a different network card. MPD: Manages MMDs, switches card and buffers packets.
Service: Maintains synchronization with other MultiNet nodes Sends signals to the IM driver using IOCTLs.
Screen Snapshot
Switching StrategiesSwitching strategies are application dependent.
Power (MultiNet vs Dual Radio)MultiNet consumes around half the total power consumed by the two radio approach for two networks.
