Mobility

A Protocol for Adaptive Multicast Transmission in Packet Radio Networks

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Executive Summary

Adaptation is required for efficient transmission in a wireless communications network because of the fluctuations in propagation conditions that occur on the links. In a half-duplex packet radio network, the use of unicast transmission typically permits the receiving radio to send packet-by-packet acknowledgments and include a small amount of feedback information in each acknowledgment. For multicast transmission in such a network, it is usually not feasible for all receiving radios to send packet-by-packet acknowledgments, so a receiving radio has fewer opportunities to provide feedback.

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