Methods and apparatus for multi-carrier communications systems with automatic repeat request (ARQ)
AssigneeNeocific, Inc.
InventorsXiaodong Li, Haiming Huang, Titus Lo, Kemin Li
Life of this patent
Estimating the term…
Abstract
Hybrid ARQ is employed in a multi-carrier communication system for retransmission of erroneous packets by taking advantage of time/frequency/space diversity and by combining ARQ functions at physical layer and MAC layers, making the multi-carrier system more robust in a high packet-error environment.
Claims16
A method for a transmitter operating over at least two allocated subchannels in a communication system, each subchannel containing a plurality of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers, the method comprising:
- transmitting, at a first transmission time to a receiver in the communication system, a first data packet over a first subchannel and a second data packet over a second subchannel;
- receiving a negative acknowledgement (NACK) from the receiver regarding the first data packet, the NACK indicating an error in the first data packet received by the receiver;
- and
- implementing a transmission swapping procedure with the first subchannel and the second subchannel at a second transmission time, the transmission swapping procedure enabling recovery of the first data packet by:
- re-transmitting the first data packet or its parity data over the second subchannel;
- and
- transmitting a third data packet originally scheduled for the second subchannel over the first subchannel,
- wherein the first subchannel and second subchannels have different spatial configurations and different pilot subcarrier compositions.
A method for a receiver operating over at least two allocated subchannels in a communication system, each subchannel containing a plurality of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers, the method comprising:
- receiving, at a first reception time from a transmitter in the communication system, a first data packet over a first subchannel and a second data packet over a second subchannel;
- transmitting a negative acknowledgement (NACK) regarding the first data packet to the transmitter if there is an error in the first data packet;
- and
- receiving, at a second reception time, the re-transmission of the first data packet or its parity data over the second subchannel and transmission of a third data packet originally scheduled for the second subchannel over the first subchannel, wherein the first subchannel and second subchannels have different spatial configurations and different pilot subcarrier compositions;
- and
- combining the data received over the first subchannel at the first reception time and the data received over the second subchannel at the second reception time to recover the first data packet.
A transmitter operating over at least two allocated subchannels in a communication system, each subchannel containing a plurality of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers, the transmitter comprising:
- an apparatus configured to transmit to a receiver in the communication system a first data packet over a first subchannel and a second data packet over a second subchannel at a first transmission time;
- an apparatus configured to receive a negative acknowledgement (NACK) from the receiver regarding the first data packet, the NACK indicating an error in the first data packet received by the receiver;
- and
- an apparatus configured to implement a transmission swapping procedure with the first subchannel and the second subchannel at a second transmission time, the transmission swapping procedure enabling recovery of the first data packet by:
- re-transmitting the first data packet or its parity data over the second subchannel;
- and
- transmitting a third data packet originally scheduled for the second subchannel over the first subchannel,
- wherein the first subchannel and second subchannel have different spatial configurations and different pilot subcarrier compositions.
A receiver operating over at least two allocated subchannels in a communication system, each subchannel containing a plurality of Orthogonal Frequency Division Multiplexing (OFDM) subcarriers, the method comprising:
- an apparatus configured to receive from a transmitter in the communication system a first data packet over a first subchannel and a second data packet over a second subchannel at a first reception time;
- an apparatus configured to transmit a negative acknowledgement (NACK) regarding the first data packet to the transmitter if there is an error in the first data packet;
- an apparatus configured to receive the first data packet or its parity data over the second subchannel and a third data packet originally scheduled for the second subchannel over the first subchannel at a second reception time, wherein the first subchannel and second subchannel have different spatial configurations and different pilot subcarrier compositions;
- and
- an apparatus configured to combine the data received over the first subchannel at the first reception time and the data received over the second subchannel at the second reception time to recover the first data packet.
Dependencies are inferred from the claim text.