H - Electricity – 04 – W
Patent
H - Electricity
04
W
H04W 28/04 (2009.01) H04W 16/04 (2009.01) H04J 11/00 (2006.01)
Patent
CA 2690114
A user equipment includes a higher layer ARQ mechanism, a physical layer transmitter, a physical layer receiver, an ACK transmitter and an AMC unit. The ARQ mechanism is configured to generate data for transmission. The physical layer transmitter is configured to receive the data from the ARQ mechanism, format it into packets for transmission using an OFDMA air interface and to retransmit an original or selectively modified packet if an acknowledgement for that packet has not been received within a predetermined period of time. The physical layer receiver is configured to receive and demodulate received packets and retransmission statistics. The ACK transmitter is configured to transmit a corresponding acknowledgement for a given packet at the physical layer receiver. A mechanism is configured to receive the corresponding acknowledgement for the given packet transparently with respect to the higher layer ARQ mechanism. The AMC unit is configured to adjust a particular encoding/data modulation of each packet using collected retransmission statistics. Subchannels from an OFDM frequency set are selectively nulled wherein the use of a poor quality subchannel is precluded for a predetermined period and adding a previously nulled subchannel back into the OFDM frequency set where a retransmission rate or link quality indicates a high quality for the previously nulled subchannel.
Interdigital Technology Corporation
Ridout & Maybee Llp
LandOfFree
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