Wi-Fi One, LLC v. Broadcom Corp., No. 15-1944 (Fed. Cir. 2016)
Annotate this CaseThe 215 patent is directed to improving the efficiency by which messages are sent from a receiver to a sender in a telecommunications system to advise the sender that errors occurred in a particular message. Data is transmitted in discrete packets, "Protocol Data Units" (PDUs). The useful data or “payload” in those packets is carried in user data PDUs (DPDUs). Each DPDU contains a sequence number that uniquely identifies that packet, allowing the receiving computer to determine when it either has received packets out of order or has failed to receive particular packets, so that the receiver can correctly combine the packets in the proper order or direct the sender to retransmit particular packets. The receiver uses a different type of packet, a status PDU (S-PDU), to notify the sender of the DPDUs it failed to receive. The patent is concerned with organizing the information contained in S-PDUs efficiently, to minimize the size of the S-PDUs, thus conserving bandwidth. The patent discloses several methods for encoding the sequence numbers of missing packets in S-PDUs. In inter partes review, the Patent Trial and Appeal Board found, and the Federal Circuit affirmed, that various claims were anticipated and that the petition for review was not time-barred.
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