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Connecting to Multiple Networks using a Single Radio

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

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Connecting to Multiple Networks using a Single Radio

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  1. 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 • Solution: Buffer packets using PSM at APs for IS networks, and end hosts for AH networks. 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. Cisco Guy at Microsoft Microsoft Employee Ad Hoc Infrastructure Microsoft Employee • Many more applications, such as: • Gateway node of a wireless ad hoc network • Bluetooth scatternets • Extending the range of an infrastructure network Some Solutions Switching Strategies • 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. • Switching strategies are application dependent. Design Constraints • 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. • 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 cardssend packets only after association to a network. Power (MultiNet vs Dual Radio) Screen Snapshot • MultiNet consumes around half the total power consumed by the two radio approach for two networks. Design Principles • 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.

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