Multicast and broadcast transmission with partial ARQ
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Aug 4, 2000
filing date -
Aug 4, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A partial ARQ protocol for multicast and broadcast transmissions in network devices operating in a shared medium access network. To support the partial ARQ, a media access control (MAC) protocol uses robustly transmitted frame delimiters and a MAC management frame structure. In a multicast or broadcast frame with partial ARQ, a destination address field is set to that of a selected proxy device's address, and the address of the intended recipients (of group address of the intended recipients) is placed in an entry in the MAC management frame structure. The frame also contains a multicast flag set to indicate that the transmission is intended for more than one device and a value in the frame delimiters to indicate that a response is requested. Upon receipt of such a frame, the proxy device specified by the destination address field provides an appropriate response type on behalf of the group. The non-proxy recipients, detecting the multicast flag setting, know to ignore the DA in the destination address field and instead look to the MAC management entry for actual destination addresses.
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