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US 6,856,810 B2Granted
Radio system and stations for, and method of, multicast communication
AssigneeKoninklijke Philips Electronics N.V.
InventorRobert J. Davies
Life of this patent
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AssigneeKoninklijke Philips Electronics N.V.
InventorRobert J. Davies
Estimating the term…
A multicast radio data communication system comprising a master (1) and a plurality of slave stations (2, 3, 4), and using a retransmission protocol. Data is transmitted by the master station and received by the slave stations. One slave station is designated the primary slave station, and all other slaves are designated secondary slave stations. Any slave station may transmit a negative acknowledgement but only the primary slave may transmit a positive acknowledgement. Positive and negative acknowledgements are transmitted substantially simultaneously. Negative acknowledgements corrupt reception of the positive acknowledgement by the master station, thereby ensuring that the data is retransmitted. The primary slave station is selected to have the lowest quality radio link, which may be ensured by a power control command from the master.
A method of operating a multicast radio network including a master radio station and a plurality of slave radio stations, comprising transmitting data from a master station, receiving the data at each of the plurality of slave stations, at each slave station, determining whether the received data is decodeable or undecodeable, transmitting a negative acknowledgement if the received data is undecodeable, transmitting a positive acknowledgement if the received data is decodeable and the slave station is in a first state, transmitting no acknowledgement if the received data is decodeable and the slave station is in a second state, wherein only one of the plurality of slave stations is in the first state.
A multicast radio system comprising a master radio station and a plurality of slave radio stations, the master station comprising means for transmitting data and means for receiving acknowledgement messages from the slave stations, each slave station comprising means for receiving data from the master station, means for determining whether the received data is decodeable or undecodeable, means for transmitting a first acknowledgement message if the received data is undecodeable, means for transmitting a second acknowledgement message if the received data is decodeable, and means for setting the slave station into a first state wherein transmission of the second acknowledgement message in response to receiving decodeable data is enabled and means for setting the slave station into a second state wherein transmission of the second acknowledgement message in response to receiving decodeable data is disabled, wherein only one of the plurality of slave stations is in the first state and wherein a plurality of the said messages transmitted by the slave stations are at least partially concurrent.
A master station for use in a multicast radio network, comprising;
A slave radio station for use in a multicast radio network including a master station and a plurality of the slave stations, the slave station comprising means for receiving data, means for determining whether the received data is decodeable or undecodeable, means for transmitting a first acknowledgement message if the received data is undecodeable, means for transmitting a second acknowledgement message if the received data is decodeable, and means for setting the slave station into a first state wherein transmission of the second acknowledgement message in response to receiving decodeable data is enabled and means for setting the slave station into a second state wherein transmission of the second acknowledgement message in response to receiving decodeable data is disabled.
Dependencies are inferred from the claim text.