# US 10,313,061 B2 · Methods and apparatus for multi-carrier communications systems with automatic repeat request (ARQ) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,061 B2 - Document ID: US10313061B2 - Status: Granted - Kind: B2 - Application number: 15/362,536 - Filed: 2016-11-28 - Published: 2017-09-14 - Granted: 2019-06-04 - Earliest claimed: 2004-02-07 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Xiaodong Li; Haiming Huang; Titus Lo; Kemin Li - Web page: https://patentgrep.com/patent/US10313061B2 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 72/20: Control channels or signalling for resource management - H04W 74/002: {Transmission of channel access control information} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0013: {Rate matching, e.g. puncturing or repetition of code symbols} - H04L 1/1816: {with retransmission of the same, encoded, message} - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1845: {Combining techniques, e.g. code combining} - H04L 2001/0092: {Error control systems characterised by the topology of the transmission link} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## 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. ## Claims ### Claim 1 A method for a transceiver in a multi-cell wireless communication system, the method comprising: transmitting a data packet over a first subchannel to a receiver at a first transmission time, the first subchannel containing a first group of subcarriers; receiving a signal from the receiver, the signal indicating an error in the data packet received by the receiver; and transmitting, at a second transmission time different from the first transmission time, a redundancy version of the data packet to the receiver over a second subchannel and transmitting another data packet originally scheduled for the second subchannel over the first subchannel, the second subchannel containing a second group of subcarriers, wherein the second subchannel is selected from a group of subchannels reserved for data retransmission with a higher frequency reuse factor than the first subchannel. ### Claim 2 (depends on 1) The method of claim 1, wherein the higher frequency reuse factor is chosen to reduce inter-cell interference. ### Claim 3 (depends on 1) The method of claim 1, wherein the second subchannel is selected randomly from the group of subchannels reserved for data retransmission. ### Claim 4 (depends on 1) The method of claim 1, wherein the second subchannel is selected based on channel quality of the group of subchannels reserved for data retransmission. ### Claim 5 (depends on 1) The method of claim 1, wherein the redundancy version of the data packet is a progressive parity packet of the first data packet. ### Claim 6 (depends on 1) The method of claim 1, further comprising receiving a channel quality indicator (CQI) or channel measurements from the receiver. ### Claim 7 A multi-cell wireless communication system with multiple transmission antennas, the wireless communication system comprising a transceiver configured to: transmit a data packet over a first subchannel to a receiver at a first transmission time, the first subchannel containing a first group of subcarriers; receive a signal from the receiver, the signal indicating an error in the data packet received by the receiver; and transmit, at a second transmission time different from the first transmission time, a redundancy version of the data packet to the receiver over a second subchannel and transmit another data packet originally scheduled for the second subchannel over the first subchannel, the second subchannel containing a second group of subcarriers, wherein the second subchannel is selected from a group of subchannels reserved for data retransmission with a higher frequency reuse factor than the first subchannel. ### Claim 8 (depends on 7) The system of claim 7, wherein the higher frequency reuse factor is chosen to reduce inter-cell interference. ### Claim 9 A method for a transceiver in a multi-cell wireless communication system, the method comprising: receiving a data packet over a first subchannel from a transmitter at a first transmission time, the first subchannel containing a first group of subcarriers; transmitting a signal to the transmitter, the signal indicating an error in the data packet received by the transceiver; and receiving, at a second transmission time different from the first transmission time, a redundancy version of the data packet from the transmitter over a second subchannel and receiving another data packet originally scheduled for the second subchannel over the first subchannel, the second subchannel containing a second group of subcarriers, wherein the second subchannel was selected from a group of subchannels reserved for data retransmission with a higher frequency reuse factor than the first subchannel. ### Claim 10 (depends on 9) The method of claim 9, wherein the higher frequency reuse factor is employed to reduce inter-cell interference. ### Claim 11 (depends on 9) The method of claim 9, wherein the second subchannel was selected randomly from the group of subchannels reserved for data retransmission. ### Claim 12 (depends on 9) The method of claim 9, wherein the second subchannel was selected based on channel quality of the group of subchannels reserved for data retransmission. ### Claim 13 (depends on 9) The method of claim 9, wherein the transmitted signal to the transmitter is a negative acknowledgement (NACK). ### Claim 14 (depends on 9) The method of claim 9, further comprising transmitting a channel quality indicator (CQI) or channel measurements to the transmitter. ### Claim 15 A multi-cell wireless communication system, the wireless communication system comprising a transceiver configured to: receive a data packet over a first subchannel from a transmitter at a first transmission time, the first subchannel containing a first group of subcarriers; transmit a signal to the transmitter, the signal indicating an error in the data packet received by the transceiver; and receive, at a second transmission time different from the first transmission time, a redundancy version of the data packet from the transmitter over a second subchannel and receive another data packet originally scheduled for the second subchannel over the first subchannel, the second subchannel containing a second group of subcarriers, wherein the second subchannel was selected from a group of subchannels reserved for data retransmission with a higher frequency reuse factor than the first subchannel. ### Claim 16 (depends on 15) The system of claim 15, wherein the transceiver is further configured to transmit a channel quality indicator (CQI) or channel measurements to the transmitter.